I'm trying to make a workout like App. I have a full screen ImageView and a ImageButton with a play icon. I want that when I click on the ImageButton the icon changes to a stop icon immediately, and the ImageView shows the image of the first exercise that will change after lets say 20secs to the image of the second exercise, but if a want to pause the counter I click again on the ImageButton to stop it.
My layout
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:background="#FF5722"
android:orientation="vertical"
android:id="#+id/linearLayout">
<TextView
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:text="Inicio"
android:textColor="#ffff"
android:textSize="20sp"
android:textStyle="bold"
android:layout_margin="8dp"
android:layout_marginLeft="16dp"
android:id="#+id/Boton1"
android:onClick="sendMessage"
android:clickable="true"
/>
</LinearLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_margin="16dp"
android:layout_below="#+id/linearLayout"
>
<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/imagenRutina"
android:layout_marginBottom="45dp"
/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:background="#ff5722"
android:orientation="horizontal"
android:id="#+id/linearLayout3">
</LinearLayout>
<ImageButton
android:layout_width="50dp"
android:layout_height="50dp"
android:id="#+id/imageButton"
android:layout_alignTop="#+id/linearLayout3"
android:layout_centerHorizontal="true"
android:background="#ff5722"
android:clickable="true"
android:layout_marginTop="5dp"
/>
</RelativeLayout>
</RelativeLayout>
And this is my java file
import android.content.Intent;
import android.os.CountDownTimer;
import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageButton;
import android.widget.ImageView;
public class Rutina1Reproduccion extends AppCompatActivity {
ImageButton mPlayButton;
boolean isPlay = false;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_rutina1_reproduccion);
mPlayButton = (ImageButton) findViewById(R.id.imageButton);
background="#drawable/default"
mPlayButton.setBackgroundResource(R.drawable.playicon);
mPlayButton.setOnClickListener(mTogglePlayButton);
}
View.OnClickListener mTogglePlayButton = new View.OnClickListener(){
final int[] imageArray = {R.drawable.imagengemelos, R.drawable.imagengluteos, R.drawable.imagenbrazos};
final ImageView imageView = (ImageView) findViewById(R.id.imagenRutina);
final Handler handler = new Handler();
#Override
public void onClick(View v) {
if (isPlay) {
v.setBackgroundResource(R.drawable.playicon);
Runnable runnable = new Runnable() {
int i = 0;
public void run() {
imageView.setImageResource(imageArray[i]);
i++;
if (i > imageArray.length - 1) {
i = 0;
}
handler.postDelayed(this, 3000); //for interval...
}
};
handler.postDelayed(runnable, 2000); //for initial delay..
}else{
v.setBackgroundResource(R.drawable.stopicon);
}
isPlay = !isPlay; // reverse
}
};
public void sendMessage(View view){
Intent intent=new Intent(Rutina1Reproduccion.this,Rutina1.class);
startActivity(intent);
}}
The error I'm getting its fatal exception whenIi open the activity.
If I also want to play some sound when the ImageButton is clicked, how can I do it?
Related
I'm building a Contact app using ListView. My ListView has 2 button. In this app, to test the respond ability of the buttons, I intended to set the button "Edit" so that when I click on it, it will change to "Clicked", and the button "Delete" will change to "Clicked", too. When I ran the Debug, the app stopped working and I couldn't get it work again (before I added the onClickListener, this app had worked property).
I don't know what is the error, and have tried many ways to fix.
Here is my row_listview.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent" android:layout_margin="10dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:weightSum="5">
<ImageView
android:id="#+id/imgAvatar"
android:layout_width="0dp"
android:layout_height="70dp"
android:layout_weight="1"
android:src="#drawable/if_male3_403019" />
<LinearLayout
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="2.7"
android:orientation="vertical"
android:weightSum="2">
<TextView
android:id="#+id/tvName"
android:layout_width="wrap_content"
android:layout_height="0dp"
android:layout_weight="1"
android:paddingLeft="15dp"
android:text="Akai Shuichi"
android:textSize="16dp"
android:textColor="#000"
android:gravity="center_vertical"
/>
<TextView
android:id="#+id/tvNumber"
android:layout_width="wrap_content"
android:layout_height="0dp"
android:layout_weight="1"
android:paddingLeft="15dp"
android:text="0982xxxxxx"
android:textSize="16dp"
android:textColor="#000"
android:gravity="center_vertical"
/>
</LinearLayout>
<LinearLayout
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1.3"
android:weightSum="2"
android:orientation="vertical">
<Button
android:id="#+id/btnEdit"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:backgroundTint="#3FE0FF"
android:onClick="myClickHandler"
android:text="Edit"
android:textColor="#fff"
android:textStyle="bold" />
<Button
android:id="#+id/btnDelete"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:backgroundTint="#F73131"
android:onClick="myClickHandler"
android:text="Delete"
android:textColor="#fff"
android:textStyle="bold" />
</LinearLayout>
</LinearLayout>
And here is my MainActivity.java:
package com.huy9515gmail.mycontact;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.Toast;
import java.util.ArrayList;
import butterknife.BindView;
import butterknife.ButterKnife;
public class MainActivity extends AppCompatActivity {
#BindView(R.id.edt_inputName) EditText edtName;
#BindView(R.id.btnAdd) Button btnAdd;
#BindView(R.id.btnEdit) Button btnEdit;
#BindView(R.id.btnDelete) Button btnDelete;
#BindView(R.id.edt_inputNumber) EditText edtNumber;
#BindView(R.id.rdbtn_male) RadioButton rdbtn_male;
#BindView(R.id.rdbtn_female) RadioButton rdbtn_female;
#BindView(R.id.rdbtn_others) RadioButton rdbtn_others;
#BindView(R.id.gender) RadioGroup genderSelection;
private ListView lvContact;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ButterKnife.bind(this);
lvContact = (ListView) findViewById(R.id.lv_contact);
final ArrayList<Contact> arrContact = new ArrayList<>();
btnAdd.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
//validating contact info
if (((edtName.getText().toString().trim()) == "") || (edtNumber.getText().toString().trim() == "") || ((rdbtn_male.isChecked()==false) && (rdbtn_female.isChecked()==false) &&(rdbtn_others.isChecked()==false))) {
Toast.makeText(MainActivity.this, "Invalid contact info! Please try again!", Toast.LENGTH_SHORT).show();
}
//adding contact info
else {
Contact contact = new Contact(Gender.male, "", "");
//adding info
contact.setName(edtName.getText().toString());
contact.setNumber(edtNumber.getText().toString());
arrContact.add(contact);
}
CustomAdapter customAdapter = new CustomAdapter(MainActivity.this, R.layout.row_listview, arrContact);
lvContact.setAdapter(customAdapter);
}
});
}
public void myClickHandler(View v) {
LinearLayout vwParentRow = (LinearLayout) v.getParent();
Button btnEdit = (Button) vwParentRow.getChildAt(0);
Button btnDelete = (Button) vwParentRow.getChildAt(1);
btnEdit.setText("Clicked");
btnDelete.setText("Clicked");
}
}
And here is the row_listview.xml layout:
Instead of setting the android:onClick in XML, do the same as you did for btnAdd.
Find the view by id or use butterknife, then put the following in onCreate()
btnEdit.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// Your code here
}
});
btnDelete.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// Your code here
}
});
Make sure you have an element in your XML file with the id like this:
android:id="#+id/btnAdd"
Here is the java file:
import android.media.MediaPlayer;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;
public class AudioPlayer extends AppCompatActivity {
ImageView mIvPlayControl;
TextView mTvTotalDuration;
TextView mTvCurrentPosition;
MediaPlayer mp;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.music_player2);
mIvPlayControl= (ImageView) findViewById(R.id.iv_play);
mTvTotalDuration= (TextView) findViewById(R.id.tv_total);
mTvCurrentPosition= (TextView) findViewById(R.id.tv_progress);
mp = MediaPlayer.create(AudioPlayer.this, R.raw.sleep_away);
int mCurrentPosition=mp.getCurrentPosition();
int duration=mp.getDuration(); // miliseconds time
//convert into seconds
duration=duration/1000;
mCurrentPosition=mp.getCurrentPosition()/1000;
Log.e("value","value: "+duration);
mTvTotalDuration.setText(String.valueOf(duration));
mTvCurrentPosition.setText(String.valueOf(mCurrentPosition));
mIvPlayControl.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (mp.isPlaying()) {
mp.pause();
mIvPlayControl.setImageResource(R.mipmap.play_small);
} else {
mp.start();
mIvPlayControl.setImageResource(R.mipmap.pause_small);
}
}
});
And here is the layout file:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:gravity="center"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:weightSum="3"
android:gravity="center"
>
<TextView
android:id="#+id/tv_progress"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center"
android:text="0.00"
/>
<ImageView
android:id="#+id/iv_play"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:src="#mipmap/play_small"
/>
<TextView
android:id="#+id/tv_total"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:gravity="center"
android:layout_weight="1"
android:text="0.00"
/>
</LinearLayout>
</LinearLayout>
How do i move the beginning time 0 and onwards when played? Do i have to add seek bar to get moving time? Can somebody please help here? The song can be played but timer doesn't work. And more details or questions are in the comments.
Suppose mTvCurrentPlayTime is TesxtView representing current play-time on the screen then you can use following code to update the view:
Handler mHandler = new Handler();
//Make sure you update TextView on UI thread
AudioPlayer.this.runOnUiThread(new Runnable() {
#Override
public void run() {
if(mp!= null){
int mCurrentPosition = mp.getCurrentPosition() / 1000;
mTvCurrentPosition.setText(String.valueOf(mCurrentPosition));
}
mHandler.postDelayed(this, 1000);
}
});
I have an image file on which if clicked anywhere I would like X'd checkboxes to show up. (Right now its set up as check marks). The code that I have is just for connecting page 1 to page 2 with a button click. Here it is
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.EditText;
public class MainActivity extends AppCompatActivity {
public static Button button1;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
OnclickButtonListener();
}
public void OnclickButtonListener() {
button1 = (Button) findViewById(R.id.nextpage);
button1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
EditText userTextEntry = (EditText)findViewById(R.id.BRinfo);
String userdata = userTextEntry.getText().toString();
int userNumber = Integer.parseInt(userdata);
Intent intent = new Intent(MainActivity.this,Page2.class);
intent.putExtra("para name",userNumber);
startActivity(intent);
}
});
}}
Part of the XML code is
<?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="vt.tacticalcombat.MainActivity"
android:clickable="true">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/imageView2"
android:src="#mipmap/combat2"
android:layout_alignBottom="#+id/editText17"
android:layout_alignLeft="#+id/last4"
android:layout_alignStart="#+id/last4"
android:layout_alignRight="#+id/tableLayout"
android:layout_alignEnd="#+id/tableLayout"
android:layout_alignTop="#+id/imageView" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="NEXT"
android:id="#+id/nextpage"
android:layout_alignBottom="#+id/tableLayout"
android:layout_alignRight="#+id/otherinfo"
android:layout_alignEnd="#+id/otherinfo"
tools:ignore="HardcodedText,RtlHardcoded"
android:nestedScrollingEnabled="true" />
<CheckBox
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/checkBox28"
android:checked="false"
android:visibility="visible"
android:layout_alignBottom="#+id/rarmtypeinfo"
android:layout_toRightOf="#+id/mvc"
android:clickable="true"
android:layout_toEndOf="#+id/mvc" />
<Button
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/button"
android:layout_alignBottom="#+id/checkBox28"
android:layout_alignRight="#+id/injury"
android:layout_alignEnd="#+id/injury"
android:layout_alignTop="#+id/larmtype"
android:layout_alignLeft="#+id/checkBox28"
android:layout_alignStart="#+id/checkBox28" />
</RelativeLayout>
I tried using this link! but it did not work. How can I do this? Any help is appreciated
could anyone help to solve the below problem:
I created a simple activity contains 2 buttons, every time i start clicking randomly on the buttons (even when slow clicking), the app crashes when the total clicks reach exactly 30 clicks.
Java:
import android.media.AudioManager;
import android.media.ToneGenerator;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final View button_1=(findViewById(R.id.button_1));
button_1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
AudioManager am = (AudioManager) getSystemService(MainActivity.AUDIO_SERVICE);
int volume_level= am.getStreamVolume(AudioManager.STREAM_RING);
final ToneGenerator mToneGenerator = new ToneGenerator(AudioManager.STREAM_MUSIC, volume_level * 14);
mToneGenerator.stopTone();
mToneGenerator.startTone(ToneGenerator.TONE_DTMF_1, 100);
}
});
final View button_2=(findViewById(R.id.button_2));
button_2.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
AudioManager am = (AudioManager) getSystemService(MainActivity.AUDIO_SERVICE);
int volume_level= am.getStreamVolume(AudioManager.STREAM_RING);
final ToneGenerator mToneGenerator = new ToneGenerator(AudioManager.STREAM_MUSIC, volume_level * 14);
mToneGenerator.stopTone();
mToneGenerator.startTone(ToneGenerator.TONE_DTMF_9, 100);
}
});
}
}
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"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!"
android:id="#+id/textView" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="New Button"
android:id="#+id/button_1"
android:layout_below="#+id/textView"
android:layout_centerHorizontal="true" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="New Button"
android:id="#+id/button_2"
android:layout_below="#+id/button_1"
android:layout_centerHorizontal="true" />
</RelativeLayout>
My program opens with a login page, then moves to a page with two buttons (go to counter and go to scan barcode).
Very basic at this point, but I'm stuck because I press the scan barcode button and it moves to the new page fine, but if I press the 'go to counter' button (which goes to a chronometer class), the program crashes - even though there is a class made for it.
It gives me this error:
Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference.
Here is my code
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
public class page1 extends AppCompatActivity implements View.OnClickListener {
Button scanner,go2count;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_page1);
scanner = (Button) findViewById(R.id.scanner);
go2count = (Button) findViewById(R.id.go2count);
scanner.setOnClickListener(this);
go2count.setOnClickListener(this);
}
#Override
public void onClick(View v) {
switch(v.getId()){
case R.id.scanner:
startActivity(new Intent(this, ScanPage.class));
break;
case R.id.go2count:
startActivity(new Intent(this, ChronoPage.class));
break;
}
}
So if I press the 'scanner' button, it works fine. But if I press the 'go2count' button, the program gives me the error mentioned.
This is the chronometer code:
import android.os.Bundle;
import android.os.SystemClock;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Chronometer;
import android.widget.Button;
public class ChronoPage extends AppCompatActivity implements View.OnClickListener {
private Button start;
private Button stop;
private Button resume;
private Button reset;
private long time = 0;
private Chronometer myChrono;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
uI();
}
public void uI(){
start = (Button) findViewById(R.id.bStart);
start.setOnClickListener(this);
stop = (Button) findViewById(R.id.bStop);
stop.setOnClickListener(this);
resume = (Button) findViewById((R.id.bResume));
resume.setOnClickListener(this);
reset = (Button) findViewById(R.id.bReset);
reset.setOnClickListener(this);
myChrono = (Chronometer) findViewById(R.id.chronometer);
}
#Override
public void onClick(View v){
if (v == start){
myChrono.setBase(SystemClock.elapsedRealtime());
myChrono.start();
}
else if (v == stop){
time = SystemClock.elapsedRealtime();
myChrono.stop();
// printing();
}
else if (v == resume){
myChrono.setBase(myChrono.getBase() + SystemClock.elapsedRealtime() - time);
myChrono.start();
}
else if (v == reset){
myChrono.setBase(SystemClock.elapsedRealtime());
}
}
}
Another post said to try unchecking the "Use Host GPU" in the AVD manager, but that didn't solve the problem either.
Other posts have the same error, but are more specific to their code. All help is appreciated!
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_height="match_parent"
android:padding="10dp"
android:layout_width="match_parent">
<ImageView
android:id="#+id/logo1"
android:layout_marginTop="100dp"
android:layout_width="150dp"
android:layout_height="150dp"
android:layout_gravity="center_horizontal"
android:src="#drawable/swordlogocopy"/>
<Button
android:id="#+id/scanner"
android:text="Scan Barcode"
android:textColor="#DDC004"
android:background="#000000"
android:layout_width="100dp"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"/>
<Button
android:id="#+id/go2count"
android:text="Go to counter"
android:textColor="#DDC004"
android:background="#000000"
android:layout_width="100dp"
android:layout_gravity="center_horizontal"
android:layout_marginTop="30dp"
android:layout_height="wrap_content" />
And the XML layout of the Chrono Page:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_height="match_parent"
android:padding="10dp"
android:layout_width="match_parent">
<ImageView
android:id="#+id/logo1"
android:layout_marginTop="100dp"
android:layout_width="200dp"
android:layout_height="200dp"
android:layout_gravity="center_horizontal"
android:src="#drawable/swordlogocopy"/>
<Chronometer
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:textColor="#000000"
android:id="#+id/chronometer1" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/start"
android:layout_gravity="center_horizontal"
android:id="#+id/bStart"
android:textColor="#DDC004"
android:background="#000000"
android:layout_marginTop="50dp"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/stop"
android:layout_gravity="center_horizontal"
android:textColor="#DDC004"
android:background="#000000"
android:layout_marginTop="5dp"
android:id="#+id/bStop" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/resume"
android:layout_gravity="center_horizontal"
android:textColor="#DDC004"
android:background="#000000"
android:layout_marginTop="5dp"
android:id="#+id/bResume" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/reset"
android:layout_gravity="center_horizontal"
android:textColor="#DDC004"
android:background="#000000"
android:layout_marginTop="5dp"
android:id="#+id/bReset" />
If you get this error, then most likely the findViewById(id) is not finding your Button variable in your xml to set the corresponding Button and therefore returning null. Which results in a NullpointerException when trying to set a OnClickListener on this view
Check if all Button Ids are valid