How can I start and stop my countdowntimer via a button?

How can I start and stop my countdowntimer via a button? - android

This is what I have so far.. it just starts when the application is opened:
package com.android.countdown;
import android.app.Activity;
import android.os.Bundle;
import android.os.CountDownTimer;
import android.widget.TextView;
public class countdown extends Activity {
TextView mTextField;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mTextField = (TextView) findViewById(R.id.timer1);
new CountDownTimer(100000, 1000) {
public void onTick(long millisUntilFinished) {
mTextField.setText("Seconds remaining: " + millisUntilFinished / 1000);
}
public void onFinish() {
mTextField.setText("Finished");
}
}.start();
}
}
I know that I need to call start() inside a button procedure. However, if I move the .start() from where it's at the new CountDownTimer(100000 , 1000) { gets an error.

Well... maybe you need to first understand how Java and programming work. Then, you can try to do something like this:
CountDownTimer aCounter = new CountDownTimer(100000 , 1000) {
public void onTick(long millisUntilFinished) {
mTextField.setText("Seconds remaining: " + millisUntilFinished / 1000);
}
public void onFinish() {
mTextField.setText("Finished");
}
};
aCounter.start();

You can do it like this to make a thing what you want. Here is the Java code:
package com.example.smartbroashad.countdowntimer;
import android.os.CountDownTimer;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
TextView timing;
TextView status;
int workingornot=1;
//running
public void startmeplease(View view)
{
if (workingornot==1)
{
workingornot=2;
//runned
countDownTimerofme.start();
Toast.makeText(this,"STARTED!",Toast.LENGTH_SHORT).show();
}
else
{
Toast.makeText(this,"already started!",Toast.LENGTH_SHORT).show();
}
}
public void stopmeplease(View view)
{
countDownTimerofme.cancel();
status.setText("stoped!!");
workingornot=1;
}
public void settimeplease(View view)
{
}
CountDownTimer countDownTimerofme=new CountDownTimer(10000,1000) {
#Override
public void onTick(long l) {
timing.setText("time left: "+toString().valueOf(l/1000));
status.setText("started!!!");
}
#Override
public void onFinish() {
timing.setText("time left: 0");
status.setText("completed !!!!");
workingornot=1;//now able to run again
}
};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
timing=(TextView)findViewById(R.id.timer);
status=(TextView)findViewById(R.id.status);
}
}
Here is the XML:
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background=" #8e44ad"
tools:context="com.example.smartbroashad.countdowntimer.MainActivity">
<TextView
android:id="#+id/status"
android:layout_width="wrap_content"
android:layout_height="133dp"
android:layout_marginBottom="69dp"
android:layout_marginTop="16dp"
android:padding="20sp"
android:text="#string/countdown_timer_not_running"
android:textAlignment="center"
android:textAllCaps="true"
android:textColor="#2c3e50"
android:textSize="32sp"
android:textStyle="bold"
app:layout_constraintBottom_toTopOf="#+id/linearLayout"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<LinearLayout
android:id="#+id/linearLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="61dp"
android:layout_marginTop="32dp"
android:orientation="vertical"
app:layout_constraintBottom_toTopOf="#+id/linearLayout2"
app:layout_constraintHorizontal_bias="1.0"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toBottomOf="#+id/status">
<EditText
android:id="#+id/editText7"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="10"
android:inputType="time" />
<Button
android:id="#+id/settime"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background=" #00aced"
android:text="set time"
android:onClick="settimeplease"
android:textAlignment="center"
android:textAllCaps="true"
android:textColor="#2c3e50"
android:textSize="32sp"
android:textStyle="bold" />
</LinearLayout>
<LinearLayout
android:id="#+id/linearLayout2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="48dp"
android:layout_marginTop="32dp"
android:orientation="vertical"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/linearLayout">
<TextView
android:id="#+id/timer"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/running"
android:textAlignment="center"
android:textAllCaps="true"
android:textColor="#2c3e50"
android:textSize="32sp"
android:textStyle="bold"
tools:text="#string/running" />
<Button
android:id="#+id/start"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background=" #64D448"
android:text="start"
android:onClick="startmeplease"
android:textAlignment="center"
android:textAllCaps="true"
android:textColor="#2c3e50"
android:textSize="32sp"
android:textStyle="bold" />
<Button
android:id="#+id/stop"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background=" #bb0000"
android:text="stop"
android:onClick="stopmeplease"
android:textAlignment="center"
android:textAllCaps="true"
android:textColor="#ffffff"
android:textSize="32sp"
android:textStyle="bold" />
</LinearLayout>
</android.support.constraint.ConstraintLayout>

CountDownTimer timer;
Start.setOnClickListener(new
View.OnClickListener() {
#Override
public void onClick(View v) {
timer= new CountDownTimer(3000, 1000) {
#Override
public void onTick(long millisUntilFinished) {
time.setText(String.valueOf(count));
count++;
}
#Override
public void onFinish() {
time.setText("Finish");
}
};
timer.start();
}
});
Stop.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
timer.cancel();
}
});

Related

What is the meaning of SETAFFINITY ret = -1 in Android Studio? Here is the log of my Activity

In the below code, I've set the new Intent in the autocomplete_next TextView, but in my Mobile, when I run the app, and When I try to move to the next activity, It does not go the next Activity, Instead of that, it comes back again to the same previous Activity. In the Android Studio LOGCAT, I've seen the RenderScript: SETAFFINITY ret = -1 . I got no trace about this error on Google? Please Help me to fix my issue. Thank You in Advance...
activity_calculator.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".CalculatorActivity"
android:layout_centerHorizontal="true">
<TableLayout
android:id="#+id/tableinput"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TableRow
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="5dp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Operand 1 : "
android:textSize="20dp"
android:textAlignment="textStart"
/>
<EditText
android:id="#+id/oper1_edit_text"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="20dp"
android:layout_weight="1"/>
</TableRow>
<TableRow
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="5dp">
<TextView
android:id="#+id/autocomplete_textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Operand 2 : "
android:textSize="20dp"
android:textAlignment="textStart"
android:layout_weight="0"/>
<EditText
android:id="#+id/oper2_edit_text"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="20dp"
android:layout_weight="1"/>
</TableRow>
</TableLayout>
<GridLayout
android:id="#+id/calculator"
android:layout_below="#id/tableinput"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true">
<Button
android:id="#+id/add_btn"
android:layout_width="120dp"
android:layout_height="wrap_content"
android:background="#color/colorPrimary"
android:textColor="#android:color/white"
android:layout_margin="2dp"
android:textSize="20dp"
android:layout_row="0"
android:layout_column="0"
android:text="Add"/>
<Button
android:id="#+id/sub_btn"
android:layout_width="120dp"
android:layout_height="wrap_content"
android:background="#color/colorPrimary"
android:textColor="#android:color/white"
android:layout_margin="2dp"
android:textSize="20dp"
android:layout_row="0"
android:layout_column="1"
android:text="Sub"/>
<Button
android:id="#+id/min_btn"
android:layout_width="120dp"
android:layout_height="wrap_content"
android:background="#color/colorPrimary"
android:textColor="#android:color/white"
android:layout_margin="2dp"
android:textSize="20dp"
android:layout_row="0"
android:layout_column="2"
android:text="Min"/>
<Button
android:id="#+id/mul_btn"
android:layout_width="120dp"
android:layout_height="wrap_content"
android:background="#color/colorPrimary"
android:textColor="#android:color/white"
android:layout_margin="2dp"
android:textSize="20dp"
android:layout_row="1"
android:layout_column="0"
android:text="Multiply"/>
<Button
android:id="#+id/div_btn"
android:layout_width="120dp"
android:layout_height="wrap_content"
android:background="#color/colorPrimary"
android:textColor="#android:color/white"
android:layout_margin="2dp"
android:textSize="20dp"
android:layout_row="1"
android:layout_column="1"
android:text="Divide"/>
<Button
android:id="#+id/pow_btn"
android:layout_width="120dp"
android:layout_height="wrap_content"
android:background="#color/colorPrimary"
android:textColor="#android:color/white"
android:layout_margin="2dp"
android:textSize="20dp"
android:layout_row="2"
android:layout_column="1"
android:text="Power"/>
<Button
android:id="#+id/max_btn"
android:layout_width="120dp"
android:layout_height="wrap_content"
android:background="#color/colorPrimary"
android:textColor="#android:color/white"
android:layout_margin="2dp"
android:textSize="20dp"
android:layout_row="1"
android:layout_column="2"
android:text="Max"/>
<Button
android:id="#+id/rem_btn"
android:layout_width="120dp"
android:layout_height="wrap_content"
android:background="#color/colorPrimary"
android:textColor="#android:color/white"
android:layout_margin="2dp"
android:textSize="20dp"
android:layout_row="2"
android:layout_column="0"
android:text="Remainder"/>
<Button
android:id="#+id/clear_btn"
android:layout_width="120dp"
android:layout_height="wrap_content"
android:background="#color/colorPrimary"
android:textColor="#android:color/white"
android:layout_margin="2dp"
android:textSize="20dp"
android:layout_row="2"
android:layout_column="2"
android:text="clear"/>
</GridLayout>
<TableRow
android:layout_below="#id/calculator"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="5dp">
<TextView
android:id="#+id/video_textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Ans: "
android:textSize="20dp"
android:textAlignment="textStart"
android:layout_weight="0"/>
<EditText
android:id="#+id/ans_edit_text"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="20dp"
android:layout_weight="1"/>
</TableRow>
</RelativeLayout>
CalculatorActivity.java (Activity which calls another Activity)
package com.example.lab_excercise_2;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import java.lang.Math;
public class CalculatorActivity extends AppCompatActivity {
private EditText oper1, oper2, ans;
private Button add_btn, sub_btn, div_btn, mul_btn, rem_btn, max_btn, min_btn, pow_btn, clear_btn;
private Integer oper1_text, oper2_text;
private TextView video_next,autocomplete_next;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_calculator);
add_btn = findViewById(R.id.add_btn);
sub_btn = findViewById(R.id.sub_btn);
mul_btn = findViewById(R.id.mul_btn);
div_btn = findViewById(R.id.div_btn);
rem_btn = findViewById(R.id.rem_btn);
min_btn = findViewById(R.id.min_btn);
max_btn = findViewById(R.id.max_btn);
pow_btn = findViewById(R.id.pow_btn);
clear_btn = findViewById(R.id.clear_btn);
oper1 = findViewById(R.id.oper1_edit_text);
oper2 = findViewById(R.id.oper2_edit_text);
ans = findViewById(R.id.ans_edit_text);
video_next = findViewById(R.id.video_textView);
autocomplete_next = findViewById(R.id.autocomplete_textView);
add_btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
oper1_text=Integer.parseInt(oper1.getText().toString());
oper2_text=Integer.parseInt(oper2.getText().toString());
ans.setText(String.valueOf(oper1_text+oper2_text));
}
});
sub_btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
oper1_text=Integer.parseInt(oper1.getText().toString());
oper2_text=Integer.parseInt(oper2.getText().toString());
ans.setText(String.valueOf(oper1_text-oper2_text));
}
});
mul_btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
oper1_text=Integer.parseInt(oper1.getText().toString());
oper2_text=Integer.parseInt(oper2.getText().toString());
ans.setText(String.valueOf(oper1_text*oper2_text));
}
});
div_btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
oper1_text=Integer.parseInt(oper1.getText().toString());
oper2_text=Integer.parseInt(oper2.getText().toString());
ans.setText(String.valueOf(oper1_text/oper2_text));
}
});
rem_btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
oper1_text=Integer.parseInt(oper1.getText().toString());
oper2_text=Integer.parseInt(oper2.getText().toString());
ans.setText(String.valueOf(oper1_text%oper2_text));
}
});
max_btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
oper1_text=Integer.parseInt(oper1.getText().toString());
oper2_text=Integer.parseInt(oper2.getText().toString());
ans.setText((oper1_text>oper2_text ? oper1_text: oper2_text).toString());
}
});
min_btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
oper1_text=Integer.parseInt(oper1.getText().toString());
oper2_text=Integer.parseInt(oper2.getText().toString());
ans.setText((oper1_text<oper2_text ? oper1_text: oper2_text).toString());
}
});
pow_btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
oper1_text=Integer.parseInt(oper1.getText().toString());
oper2_text=Integer.parseInt(oper2.getText().toString());
Double pow = Math.pow(oper1_text,oper2_text);
ans.setText(pow.toString());
}
});
clear_btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
oper1.setText("");
oper2.setText("");
ans.setText("");
}
});
video_next.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent videoIntent = new Intent(CalculatorActivity.this,VideoActivity.class);
startActivity(videoIntent);
}
});
autocomplete_next.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent autocompleteIntent = new Intent(CalculatorActivity.this,AutocompleteActivity.class);
startActivity(autocompleteIntent);
}
});
}
}
activity_autocomplete.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".AutocompleteActivity">
<TableLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:textSize="30sp"
android:textAlignment="center"
android:layout_width="wrap_content"
android:text="Date-Time Picker Autocomplete"
android:textStyle="bold"
android:textColor="#color/colorPrimary"
android:layout_margin="20dp"
android:layout_height="wrap_content"
android:layout_weight="1"/>
<TableRow
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<Button
android:id="#+id/setTime_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#color/colorPrimary"
android:textColor="#android:color/white"
android:text="Set Time"
android:layout_weight="1"
android:layout_margin="20dp"/>
<TextView
android:id="#+id/time_text"
android:textSize="20sp"
android:textAlignment="center"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="20dp"
android:layout_weight="3"/>
</TableRow>
<TableRow
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<Button
android:id="#+id/setDate_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#color/colorPrimary"
android:textColor="#android:color/white"
android:text="Set Date"
android:layout_margin="20dp"
android:layout_weight="1" />
<TextView
android:id="#+id/date_text"
android:textSize="20sp"
android:textAlignment="center"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="20dp"
android:layout_weight="3"/>
</TableRow>
<TableRow
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<TextView
android:id="#+id/label_text"
android:textSize="20sp"
android:textAlignment="center"
android:layout_width="wrap_content"
android:text="Label "
android:textStyle="bold"
android:textColor="#color/colorPrimary"
android:layout_margin="20dp"
android:layout_height="wrap_content"
android:layout_weight="1"/>
<MultiAutoCompleteTextView
android:id="#+id/label_edit"
android:textSize="20sp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="20dp"
android:layout_weight="3" />
</TableRow>
<Button
android:id="#+id/setalarm_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#color/colorPrimary"
android:textColor="#android:color/white"
android:layout_margin="20dp"
android:text="Set Time" />
</TableLayout>
</RelativeLayout>
AutocompleteActivity.java (Activity which was called by the above Activity)
package com.example.lab_excercise_2;
import androidx.appcompat.app.AppCompatActivity;
import android.app.DatePickerDialog;
import android.app.TimePickerDialog;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.MultiAutoCompleteTextView;
import android.widget.TextView;
import android.widget.TimePicker;
import java.text.SimpleDateFormat;
import java.util.Calendar;
public class AutocompleteActivity extends AppCompatActivity {
private Button setTime, setDate, setalarm;
private TextView time_text, date_text, label_text;
private Calendar calendar = Calendar.getInstance();
private String date_string, time_string, label_string;
private String[] labels = {"Wake Up","Time to School","Time to College","Time to Work","Complete Activity","Finish Project"};
private MultiAutoCompleteTextView label_autocomplete;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_autocomplete);
setTime = findViewById(R.id.setTime_btn);
setDate = findViewById(R.id.setDate_btn);
setalarm = findViewById(R.id.setalarm_btn);
time_text = findViewById(R.id.time_text);
date_text = findViewById(R.id.date_text);
label_autocomplete = findViewById(R.id.label_edit);
label_text = findViewById(R.id.label_textView);
setDate.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
showDateDialog(setDate);
}
});
setTime.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
showTimeDialog(setTime);
}
});
setalarm.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
nextpage(v);
}
});
label_autocomplete.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent alarmIntent = new Intent(AutocompleteActivity.this,AlarmActivity.class);
startActivity(alarmIntent);
}
});
label_text.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent alarmIntent = new Intent(AutocompleteActivity.this,AlarmActivity.class);
startActivity(alarmIntent);
}
});
ArrayAdapter adapter = new ArrayAdapter(this,android.R.layout.simple_list_item_1,labels);
label_autocomplete.setAdapter(adapter);
label_autocomplete.setTokenizer(new MultiAutoCompleteTextView.CommaTokenizer());
}
public void showTimeDialog(final Button time){
TimePickerDialog.OnTimeSetListener timeSetListener = new TimePickerDialog.OnTimeSetListener() {
#Override
public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
calendar.set(Calendar.HOUR_OF_DAY,hourOfDay);
calendar.set(Calendar.MINUTE,minute);
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("HH:mm");
time_text.setText(simpleDateFormat.format(calendar.getTime()));
}
};
new TimePickerDialog(AutocompleteActivity.this,timeSetListener,calendar.get(Calendar.HOUR_OF_DAY),calendar.get(Calendar.MINUTE),false).show();
}
public void showDateDialog(final Button date){
DatePickerDialog.OnDateSetListener dateSetListener = new DatePickerDialog.OnDateSetListener() {
#Override
public void onDateSet(DatePicker view, int year, int month, int dayOfMonth) {
calendar.set(Calendar.YEAR,year);
calendar.set(Calendar.MONTH,month);
calendar.set(Calendar.DAY_OF_MONTH,dayOfMonth);
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yy-MM-dd");
date_text.setText(simpleDateFormat.format(calendar.getTime()));
}
};
new DatePickerDialog(AutocompleteActivity.this, dateSetListener,calendar.get(Calendar.YEAR),calendar.get(Calendar.MONTH),calendar.get(Calendar.DAY_OF_MONTH)).show();
}
public void nextpage(View view){
date_string = date_text.getText().toString();
time_string = time_text.getText().toString();
label_string = label_autocomplete.getText().toString();
Intent nextIntent = new Intent(this,Autocomplete2Activity.class);
nextIntent.putExtra("date",date_string);
nextIntent.putExtra("time",time_string);
nextIntent.putExtra("label",label_string);
startActivity(nextIntent);
}
}
LOGCAT
2020-03-02 19:55:10.865 4078-4136/com.example.lab_excercise_2E/RenderScript: SETAFFINITY ret = -1
2020-03-02 19:55:10.865 4078-4137/com.example.lab_excercise_2 E/RenderScript: SETAFFINITY ret = -1
2020-03-02 19:55:10.865 4078-4139/com.example.lab_excercise_2 E/RenderScript: SETAFFINITY ret = -1
2020-03-02 19:55:10.865 4078-4138/com.example.lab_excercise_2 E/RenderScript: SETAFFINITY ret = -1
2020-03-02 19:55:10.865 4078-4140/com.example.lab_excercise_2 E/RenderScript: SETAFFINITY ret = -1
2020-03-02 19:55:10.865 4078-4142/com.example.lab_excercise_2 E/RenderScript: SETAFFINITY ret = -1
2020-03-02 19:55:10.865 4078-4141/com.example.lab_excercise_2 E/RenderScript: SETAFFINITY ret = -1`

<Android>create calculator in android studio (equal button did not work)

I'm creating a simple calculator in Android Studio but the equal button didn't work. When I clicked the equal button, the app crash but it didn't show any error message. Other buttons work fine, I couldn't figure out why my equal button didn't work.
This is my MainActivity.java
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.widget.Button;
import android.widget.EditText;
import android.view.View;
public class MainActivity extends AppCompatActivity {
private EditText showNum;
private Button one;
private Button two;
private Button three;
private Button four;
private Button five;
private Button six;
private Button seven;
private Button eight;
private Button nine;
private Button zero;
private Button divide;
private Button multiple;
private Button minus;
private Button equal;
private Button dot;
private Button plus;
private Button clear;
private Boolean addButton, multipleButton, minusButton, divideButton;
Float value, currentValue;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
showNum=(EditText) findViewById(R.id.editView);
one = (Button)findViewById(R.id.button1);
two = (Button)findViewById(R.id.button2);
three = (Button)findViewById(R.id.button3);
four = (Button)findViewById(R.id.button4);
five = (Button)findViewById(R.id.button5);
six = (Button)findViewById(R.id.button6);
seven = (Button)findViewById(R.id.button7);
eight = (Button)findViewById(R.id.button8);
nine = (Button)findViewById(R.id.button9);
zero = (Button)findViewById(R.id.button0);
divide = (Button)findViewById(R.id.buttonDivide);
multiple = (Button)findViewById(R.id.buttonMultiple);
minus = (Button)findViewById(R.id.buttonMinus);
equal = (Button)findViewById(R.id.buttonEqual);
dot = (Button)findViewById(R.id.buttonDot);
plus = (Button)findViewById(R.id.buttonPlus);
clear = (Button)findViewById(R.id.buttonC);
clear.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v){
showNum.setText("");
}
});
zero.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v){
showNum.setText(showNum.getText()+"0");
}
});
one.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v){
showNum.setText(showNum.getText()+"1");
}
});
two.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v){
showNum.setText(showNum.getText()+"2");
}
});
three.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v){
showNum.setText(showNum.getText()+"3");
}
});
four.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v){
showNum.setText(showNum.getText()+"4");
}
});
five.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v){
showNum.setText(showNum.getText()+"5");
}
});
six.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v){
showNum.setText(showNum.getText()+"6");
}
});
seven.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v){
showNum.setText(showNum.getText()+"7");
}
});
eight.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v){
showNum.setText(showNum.getText()+"8");
}
});
nine.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v){
showNum.setText(showNum.getText()+"9");
}
});
dot.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v){
showNum.setText(showNum.getText()+".");
}
});
divide.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v){
value = Float.parseFloat(showNum.getText()+"");
divideButton=true;
showNum.setText(null);
}
});
multiple.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v){
if(showNum==null){
showNum.setText("");
}
else{
value = Float.parseFloat(showNum.getText()+"");
multipleButton=true;
showNum.setText(null);
}
}
});
plus.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v){
value = Float.parseFloat(showNum.getText()+"");
addButton=true;
showNum.setText(null);
}
});
minus.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v){
value = Float.parseFloat(showNum.getText()+"");
minusButton=true;
showNum.setText(null);
}
});
equal.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v){
currentValue = Float.parseFloat(showNum.getText()+"");
if (divideButton) {
showNum.setText(value / currentValue + "");
divideButton = false;
Log.i("gina", "b"+divideButton);
}
if (multipleButton){
showNum.setText(value * currentValue + "");
multipleButton = false;
}
if (addButton){
showNum.setText(value+currentValue + "");
addButton = false;
}
if (minusButton){
showNum.setText(value-currentValue + "");
minusButton = false;
}
}
});
}
}
Below is my activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.iu.hsiaoyuanwang.proficiency2.MainActivity">
<EditText
android:id="#+id/editView"
android:layout_alignParentTop="true"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text=""
android:padding="35dp"
android:textSize="30sp"
android:gravity="top|center" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="#+id/editView"
android:orientation="vertical"
android:id="#+id/linear1">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1">
<Button
android:id="#+id/button7"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="7"
android:textSize="20dp" />
<Button
android:id="#+id/button8"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="8"
android:textSize="20dp"
/>
<Button
android:id="#+id/button9"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:textSize="20dp"
android:text="9" />
<Button
android:id="#+id/buttonDivide"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="÷"
android:textSize="20dp" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1">
<Button
android:id="#+id/button4"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="4"
android:textSize="20dp" />
<Button
android:id="#+id/button5"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="5"
android:textSize="20dp"
/>
<Button
android:id="#+id/button6"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:textSize="20dp"
android:text="6" />
<Button
android:id="#+id/buttonMultiple"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="x"
android:textSize="20dp" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1">
<Button
android:id="#+id/button1"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="1"
android:textSize="20dp" />
<Button
android:id="#+id/button2"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="2"
android:textSize="20dp"
/>
<Button
android:id="#+id/button3"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:textSize="20dp"
android:text="3" />
<Button
android:id="#+id/buttonMinus"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="-"
android:textSize="20dp" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1">
<Button
android:id="#+id/button0"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="0"
android:textSize="20dp" />
<Button
android:id="#+id/buttonDot"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="."
android:textSize="20dp"
/>
<Button
android:id="#+id/buttonEqual"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:textSize="20dp"
android:text="=" />
<Button
android:id="#+id/buttonPlus"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="+"
android:textSize="20dp" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1">
<Button
android:id="#+id/buttonC"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="C"
android:textSize="20dp" />
</LinearLayout>
</LinearLayout>
</RelativeLayout>

As Kuti suggested, its better to keep only one OnClickListener, so keep his advice in mind.
A Boolean is an object, is not true or false, so the sentence if(addButton) when addButton is a Boolean is always false. Try using addButton.booleanValue() or use a boolean instead of a Boolean

Content of second activity is not showing

So, content of second activity does not appear when app is running, although content is showing in xml design. Programming in Java on Android Studio. In similar article answer didn't help. I also tried just to put one element in second activity, same result. Thanks in advance!
This is code from MainActivity.java:
package todo.beginner.com.carchooser2;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.Toast;
import static todo.beginner.com.carchooser2.R.id.checkBoxPrice;
import static todo.beginner.com.carchooser2.R.id.checkBoxGas;
import static todo.beginner.com.carchooser2.R.id.checkBoxYear;
import static todo.beginner.com.carchooser2.R.id.checkBoxMileage;
import static todo.beginner.com.carchooser2.R.id.checkBoxCapacity;
public class MainActivity extends AppCompatActivity {
private CheckBox check1, check2, check3, check4, check5;
private static Button button_next;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
addListenerToCeckBox();
OnClickButtonListener();
}
public void OnClickButtonListener() {
button_next = (Button)findViewById(R.id.button);
button_next.setOnClickListener(
new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent("todo.beginner.com.SecondActivity");
startActivity(intent);
}
}
);
}
public void addListenerToCeckBox() {
check1 = (CheckBox)findViewById(checkBoxCena);
check1.setOnClickListener(
new View.OnClickListener() {
#Override
public void onClick(View v) {
if (((CheckBox)v).isChecked()){
Toast.makeText(MainActivity.this,
"Price is chosen", Toast.LENGTH_LONG).show();
}
}
}
);
check2 = (CheckBox)findViewById(checkBoxGads);
check2.setOnClickListener(
new View.OnClickListener() {
#Override
public void onClick(View v) {
if (((CheckBox)v).isChecked()){
Toast.makeText(MainActivity.this,
"Year is chosen", Toast.LENGTH_LONG).show();
}
}
}
);
check3 = (CheckBox)findViewById(checkBoxTilpums);
check3.setOnClickListener(
new View.OnClickListener() {
#Override
public void onClick(View v) {
if (((CheckBox)v).isChecked()){
Toast.makeText(MainActivity.this,
"Engine capacity is chosen", Toast.LENGTH_LONG).show();
}
}
}
);
check4 = (CheckBox)findViewById(checkBoxDegviela);
check4.setOnClickListener(
new View.OnClickListener() {
#Override
public void onClick(View v) {
if (((CheckBox)v).isChecked()){
Toast.makeText(MainActivity.this,
"Gas consumption is chosen", Toast.LENGTH_LONG).show();
}
}
}
);
check5 = (CheckBox)findViewById(checkBoxNobraukums);
check5.setOnClickListener(
new View.OnClickListener() {
#Override
public void onClick(View v) {
if (((CheckBox)v).isChecked()){
Toast.makeText(MainActivity.this,
"Mileage is chosen", Toast.LENGTH_LONG).show();
}
}
}
);
}
}
This is from activity_main.xml:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context="todo.raitis.com.carchooser.MainActivity">
<CheckBox
android:text="Price"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/checkBoxPrice"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="67dp" />
<CheckBox
android:text="Year"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#+id/checkBoxPrice"
android:layout_alignRight="#+id/checkBoxPrice"
android:layout_alignEnd="#+id/checkBoxPrice"
android:layout_marginTop="33dp"
android:id="#+id/checkBoxYear" />
<CheckBox
android:text="Engine Capacity"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="37dp"
android:id="#+id/checkBoxCapacity"
android:layout_below="#+id/checkBoxYear"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
<CheckBox
android:text="Gas"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#+id/checkBoxCapacity"
android:layout_alignRight="#+id/checkBoxCapacity"
android:layout_alignEnd="#+id/checkBoxCapacity"
android:layout_marginTop="30dp"
android:id="#+id/checkBoxGas" />
<CheckBox
android:text="Mileage"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#+id/checkBoxGas"
android:layout_alignRight="#+id/checkBoxGas"
android:layout_alignEnd="#+id/checkBoxGas"
android:layout_marginTop="33dp"
android:id="#+id/checkBoxMileage" />
<Button
android:text="Next"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="31dp"
android:id="#+id/button" />
<TextView
android:text="Choose criteria!"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
android:id="#+id/textView"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
</RelativeLayout>
This is from SecondActivity.java:
package todo.beginner.com.carchooser2;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
public class SecondActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second);
}
}
And this is from activity_second.xml:
<?xml version="1.0" encoding="utf-8"?>
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="10dp">
<TableRow
android:background="#607D8B"
android:padding="5dp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Car Name" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Price" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Year" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Gas" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Mileage" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Capacity" />
</TableRow>
<TableRow
android:background="#ECEFF1"
android:padding="5dp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Audi" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="5000" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="2001" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="7" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="280000" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="2.5" />
</TableRow>
</TableLayout>

You are using the intent incorrectly. It should be:
Intent intent = new Intent(MainActivity.this,SecondActivity.class);
startActivity(intent);

Don't think you're starting the activity correctly. Try changing Intent intent = new Intent("todo.beginner.com.SecondActivity"); to Intent intent = new Intent(MainActivity.this, SecondActivity.class); in your MainActivity.

Android Studio:App crashes when countdown timer is started

I made an app that counts the scored goals in a match (When you're playing with friends and you're too lazy to count the scores :D ) I want to make a countdown timer to count the time for the match.
My app crashes when I push a Start button to start the countdown timer.I have 2 Activities.The Main activity is the code that counts the scores for the 2 teams.
This is my Second Activity code(Where the CountDowntimer should be.):
package com.example.robert.scorecount;
import android.os.CountDownTimer;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import java.util.concurrent.TimeUnit;
public class SecondActivity extends AppCompatActivity {
Button StartButton,StopButton;
TextView TimerText;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second);
Button StartButton = (Button) findViewById(R.id.StartButton);
Button StopButton = (Button) findViewById(R.id.StopButton);
TextView TimerText = (TextView) findViewById(R.id.Timer);
TimerText.setText("00:00:00");
final CounterClass timer = new CounterClass(3600000,1000);
assert StartButton != null;
StartButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
timer.start();
}
});
assert StopButton != null;
StopButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
timer.cancel();
}
});
}
public class CounterClass extends CountDownTimer{
public CounterClass(long millisInFuture, long countDownInterval) {
super(millisInFuture, countDownInterval);
}
#Override
public void onTick(long millisUntilFinished) {
String HourMinutesSeconds = String.format("%02d:%02d:%02d", TimeUnit.MILLISECONDS.toHours(millisUntilFinished),
TimeUnit.MILLISECONDS.toMinutes(millisUntilFinished) - TimeUnit.HOURS.toMinutes(TimeUnit.MILLISECONDS.toHours(millisUntilFinished)),
TimeUnit.MILLISECONDS.toSeconds(millisUntilFinished) - TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(millisUntilFinished)));
TimerText.setText(HourMinutesSeconds);
}
#Override
public void onFinish() {
TimerText.setText("Finished.");
}
}
}
And This is my layout code:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context="com.example.robert.scorecount.SecondActivity">
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Timer Settings"
android:id="#+id/textView"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:textSize="20dp"
android:textAlignment="center" />
<Button
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Start"
android:id="#+id/StartButton"
android:layout_marginBottom="37dp"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="00:00"
android:id="#+id/Timer"
android:textSize="30dp"
android:layout_marginTop="88dp"
android:layout_below="#+id/ThirtyMinMatch"
android:layout_centerHorizontal="true" />
<Button
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Stop"
android:id="#+id/StopButton"
android:layout_above="#+id/StartButton"
android:layout_centerHorizontal="true" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="30 Minutes"
android:id="#+id/ThirtyMinMatch"
android:layout_marginTop="24dp"
android:layout_below="#+id/textView"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_toLeftOf="#+id/Timer"
android:layout_toStartOf="#+id/Timer" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="1 Hour"
android:id="#+id/OneHourMinMatch"
android:layout_alignTop="#+id/ThirtyMinMatch"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:layout_toRightOf="#+id/Timer"
android:layout_toEndOf="#+id/Timer" />
</RelativeLayout>

Your code:
TextView TimerText = (TextView) findViewById(R.id.Timer);
Change this line and just delete "TextView", it's already on top.
TimerText = (TextView) findViewById(R.id.Timer);

Timer App closing out after second onClick of the START button

I am pretty new to android and am making a timer app (The code is not complete, as you can see, but I am testing on thing at a time). hitting the start button a second time results in the app closing out. I edited my code so that the timer is being recreated each call to onClick, but the app still closes out after the second click. Thank you for the help.
package com.example.ryan.timerapp;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import java.util.Timer;
import java.util.TimerTask;
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
secondsView = (TextView) findViewById(R.id.seconds);
tenSecondsView = (TextView) findViewById(R.id.tensSeconds);
hoursView = (TextView) findViewById(R.id.hours);
tenHoursView = (TextView) findViewById(R.id.tensHours);
minutesView = (TextView) findViewById(R.id.minutes);
tenMinutesView = (TextView) findViewById(R.id.tensMinutes);
timer = new Timer();
}
TextView secondsView;
TextView tenSecondsView;
TextView hoursView;
TextView tenHoursView;
TextView minutesView;
TextView tenMinutesView;
Timer timer;
TimerTask timerTask;
public void start(View view){
if(timer != null) {
timerTask.cancel();
timer.cancel();
}
timer = new Timer();
timerTask = new TimerTask() {
#Override
public void run() {
runOnUiThread(new Thread(new Runnable() {
#Override
public void run() {
int secondsInt = Integer.parseInt(secondsView.getText().toString());
int tenSecondsInt = Integer.parseInt(tenSecondsView.getText().toString());
int hoursInt = Integer.parseInt(hoursView.getText().toString());
int tenHoursInt = Integer.parseInt(tenHoursView.getText().toString());
int minutesInt = Integer.parseInt(minutesView.getText().toString());
int tenMinutesInt = Integer.parseInt(tenMinutesView.getText().toString());
if (secondsInt < 9) {
secondsInt++;
secondsView.setText(secondsInt + "");
} else {
secondsInt = 0;
secondsView.setText(secondsInt + "");
if (tenSecondsInt < 6) {
tenSecondsInt++;
tenSecondsView.setText(tenSecondsInt + "");
} else {
tenSecondsInt = 0;
tenSecondsView.setText(tenSecondsInt + "");
if (minutesInt < 9) {
minutesInt++;
minutesView.setText(minutesInt + "");
} else {
minutesInt = 0;
minutesView.setText(minutesInt + "");
}
}
}
}
}));
}
};
timer.scheduleAtFixedRate(timerTask,0, 1000);
}
public void stop(View view){
timer.cancel();
}
public void reset(View view){
secondsView.setText("0");
tenSecondsView.setText("0");
minutesView.setText("0");
tenMinutesView.setText("0");
hoursView.setText("0");
tenHoursView.setText("0");
}
}
XML:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.example.ryan.timerapp.MainActivity"
android:layout_margin="5dp"
>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="35sp"
android:text="Timer"
android:gravity="center"
/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:gravity="center"
android:layout_weight="2"
>
<TextView
android:id="#+id/tensHours"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="35sp"
android:text="0"
/>
<TextView
android:id="#+id/hours"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="35sp"
android:text="0"
/>
<TextView
android:id="#+id/firstColon"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="35sp"
android:text=":"
/>
<TextView
android:id="#+id/tensMinutes"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="35sp"
android:text="0"
/>
<TextView
android:id="#+id/minutes"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="35sp"
android:text="0"
/>
<TextView
android:id="#+id/secondColon"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="30sp"
android:text=":"
/>
<TextView
android:id="#+id/tensSeconds"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="35sp"
android:text="0"
/>
<TextView
android:id="#+id/seconds"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="35sp"
android:text="0"
/>
</LinearLayout>
<Button
android:id="#+id/startButton"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="2"
android:text="START"
android:textSize="30sp"
android:onClick="start"
/>
<Button
android:id="#+id/stopButton"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="2"
android:text="STOP"
android:textSize="30sp"
android:onClick="stop"
/>
<Button
android:id="#+id/resetButton"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="10dp"
android:layout_weight="2"
android:text="RESET"
android:textSize="30sp"
android:onClick="reset"
/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
/>
</LinearLayout>

the first being the Seconds counter not updating past 1 second
TimerTask is used to run a particular task at a specified time.
timer.schedule() is not meant to run continuously.
Check this documentation.
So this block of code-
int secondsInt = Integer.parseInt(txt.getText().toString());
secondsInt++;
if(secondsInt<=6) {
txt.setText(secondsInt + "");
}
will run only once . Hence
Seconds counter not updating past 1 second
is the apparent behavior.
hitting the start button a second time results in the app closing out
You are trying to run an already scheduled TimerTask.
You need to create a new Timer instance to start your TimerTask again.
Change your start() method -
public void start(View view){
if(timer != null) {
timerTask.cancel();
timer.cancel();
}
timer = new Timer();
timerTask = new TimerTask() {
#Override
public void run() {
runOnUiThread(new Thread(new Runnable() {
#Override
public void run() {
int secondsInt = Integer.parseInt(txt.getText().toString());
secondsInt++;
if(secondsInt<=6) {
seconds.setText(secondsInt + "");
}
}
}));
}
};
timer.scheduleAtFixedRate(timerTask,0, 1000);
}
Also, no need to initialize your TextView again and again . Do it once only in onCreate() -
private TextView seconds;
private Timer timer;
private TimerTask timerTask;
In onCreate()
seconds = (TextView) findViewById(R.id.seconds);

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Timer App closing out after second onClick of the START button

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