Develop Reference

Making a line of code repeat in android every second

This is the line i want to repeat.
handler.postDelayed(runnableCode, 1);
This app is a tycoon app and so the user can buy upgrades and if they tap the button the get $$ and so when they buy upgrades keeping the value up-to-date is required.
package com.example.navjeevenmann.mytycoon;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
private Button myButton;
private int Counter = 0;
private Button myButton2;
private TextView myTextView;
Handler handler = new Handler();
private int Test = 5;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
handler.postDelayed(runnableCode, 1);
myButton = (Button) findViewById(R.id.button);
myButton2 = (Button) findViewById(R.id.button2);
myTextView = (TextView) findViewById(R.id.textView);
myButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
ButtonCounter(Counter);
}
});
myButton2.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intent = new Intent(getApplicationContext(),
SecondActivity.class);
intent.putExtra("Count", Counter);
startActivity(intent);
finish();
}
});
}
public int ButtonCounter(int Counter){
Counter+=1;
return Counter;
}
public int AutoCounter(int Counter, int add) {
Counter+=add;
return Counter;
}
public void Display(int Counter, TextView myTextView) {
String man = String.valueOf(Counter);
myTextView.setText("$" + man);
}
private Runnable runnableCode = new Runnable() {
#Override
public void run() {
// Do something here on the main thread
Counter = AutoCounter(Counter,Test);
Display(Counter, myTextView);
}
};
}

handler.postDelayed(runnableCode, 1);
call that line inside onResume() method. Make sure your show an AlertDialog to the user whenever he or she hits the button to get $$. Since the AlertDialog pops up everytime the user tries to buy $$. onResume() will be called.

Try this
private void startAnimation() {
countDownTimer = new CountDownTimer(700, 500) {
#Override
public void onTick(long millisUntilFinished) {
}
#Override
public void onFinish() {
//your code to repeat
}
start();
}
}.start();
}

How to tell when during countDownTimer() method a user presses a button?

I Have countDownTimer() method and want to print a certain toast if the user presses the button when the timer is at 10 or 9 seconds left. I am trying to read the time by reading the textview of the timer in the gameButton() method but it only prints the fail toast and not the pass toast. So why can I not do this? And also how can I get it to work? Thanks.
import android.app.Activity;
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 android.widget.Toast;
public class GameScreen extends Activity {
private TextView time;
private Button start;
private Button cancel;
private Button gameButton;
private CountDownTimer countDownTimer;
private View.OnClickListener btnClickListener = new View.OnClickListener(){
#Override
public void onClick(View v) {
switch(v.getId()){
case R.id.start_ID :
start();
break;
case R.id.cancel :
cancel();
break;
case R.id.gameButton_ID :
gameButton();
break;
}
}
};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_game_screen);
start = (Button) findViewById(R.id.start_ID);
start.setOnClickListener(btnClickListener);
cancel = (Button) findViewById(R.id.cancel);
cancel.setOnClickListener(btnClickListener);
time = (TextView) findViewById(R.id.time);
gameButton = (Button) findViewById(R.id.gameButton_ID);
gameButton.setOnClickListener(btnClickListener);
}
public void start(){
time.setText("15");
countDownTimer = new CountDownTimer(15 * 1000, 1000) {
#Override
public void onTick(long millsUntilFinished){
time.setText("" + millsUntilFinished / 1000);
/* gameButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// Perform action on click
//if(time.getText() == "10" || time.getText() == "9" ){
Toast.makeText(new GameScreen(), "This is my Toast message!", Toast.LENGTH_LONG).show();
//}
}
}); */
}
public void onFinish(){
time.setText("Done !");
}
};
countDownTimer.start();
}
private void cancel(){
if(countDownTimer != null){
countDownTimer.cancel();
countDownTimer = null;
}
}
private void gameButton(){
if(time.getText() == "10" || time.getText() == "9" ){
Toast.makeText(getApplicationContext(), "PASS", Toast.LENGTH_SHORT).show();
}
else{
Toast.makeText(getApplicationContext(), "FAIL", Toast.LENGTH_SHORT).show();
}
}
}

Use equals method not == operator
time.getText().equals("10") || time.getText().equals("9")
See What is the difference between == vs equals() in Java?

Android app auto increment a value by 1 with some delay

This is a part of an app that I am trying to make. I am trying to make a delay that can be set by the user so after each +1 it delays with 500 milliseconds, but soon I figured that i don't even know how to add a simple build in delay, I tried with delay(1000); it gave me Can not resolve method delay(int) then with sleep(1000); same error, then with TimeUnit.SECONDS.sleep(1); and Thread.sleep(1); nothing worked I am missing something fundamental, maybe I need to import something ? this is the whole program
if (v == swt1){
while (counter<2100000000) {
counter++;
}
scoreText.setText(Integer.toString(counter));
scoreText.setBackgroundColor(Color.BLACK);
}
Activity:
package counter.test.my.simplecount;
import android.os.Bundle;
import android.util.TypedValue;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Switch;
import android.widget.TextView;
import android.app.Activity;
import android.graphics.Color;
public class MainActivity extends Activity implements OnClickListener {
Button btn1;
Button btn2;
Button btn3;
Switch swt1;
TextView textTitle;
EditText scoreText;
int counter = 0;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
btn1 = (Button)findViewById(R.id.button);
btn2 = (Button)findViewById(R.id.button2);
btn3 = (Button)findViewById(R.id.button3);
swt1 = (Switch)findViewById(R.id.switch1);
scoreText = (EditText)findViewById(R.id.editText);
textTitle = (TextView)findViewById(R.id.textView);
btn1.setOnClickListener(this);
btn2.setOnClickListener(this);
btn3.setOnClickListener(this);
textTitle.setTextSize(TypedValue.COMPLEX_UNIT_SP, 34);
}
#Override
public void onClick(View v) {
if (v == btn1){
counter++;
scoreText.setText(Integer.toString(counter));
scoreText.setBackgroundColor(Color.CYAN);
}
if (v == btn2){
counter--;
scoreText.setText(Integer.toString(counter));
scoreText.setBackgroundColor(Color.GREEN);
}
if (v == btn3){
counter = 0;
scoreText.setText(Integer.toString(counter));
scoreText.setBackgroundColor(Color.RED);
if (v == swt1){
while (counter<2100000000) {
counter++;
}
scoreText.setText(Integer.toString(counter));
scoreText.setBackgroundColor(Color.RED);
}
}
}
}

You can use Handler() for delay like
new Handler().postDelayed(new Runnable() {
#Override
public void run() {
//Your Aftre delay code
}
},500);
Remember to import this:
import android.os.Handler;

Use the "Handler" with "Runnable" to auto increment a value continuously at some time delay. Here i used "1sec" time dealy.
Find below code snippet for your requirement.
Runnable runnable;
Handler handler;
int delayTimeSec = 1000; //1 Sec
handler = new Handler();
runnable = new Runnable(){
#Override
public void run() {
// Your auto increment logic...
handler.postDelayed(runnable, delayTimeSec);
}
}
handler.postDelayed(runnable, delayTimeSec);

Use thread instead of handler if you have got background tasks.
new Thread(new Runnable() {
#Override
public void run() {
///background calculations
try {
Thread.sleep(1000L);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
runOnUiThread(new Runnable() {
#Override
public void run() {
//main thread task to update user interface
}
});
}
}).start();

How to stop a countdown timer.....?

I am having problem in stopping a CountDownTimer. I have searched a lot but couldn't understand how to do that.
Below is my MainActivity. How can I stop the timer if RadioButton b is pressed?
import java.util.Timer;
import java.util.TimerTask;
import android.os.Bundle;
import android.os.CountDownTimer;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.widget.RadioButton;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends Activity {
TextView mTextField;
RadioButton a, b, c, d, e;
final static long interval = 1000;
long timeout = 15000;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mTextField = (TextView) findViewById(R.id.tv);
a = (RadioButton) findViewById(R.id.rB1a);
b = (RadioButton) findViewById(R.id.rB2a);
c = (RadioButton) findViewById(R.id.rB3a);
d = (RadioButton) findViewById(R.id.rB4a);
e = (RadioButton) findViewById(R.id.rB5a);
//Timer timer = new Timer();
//timer.scheduleAtFixedRate(task, interval, interval);
TimerTask task = new TimerTask() {
#Override
public void run() {
timeout = timeout - interval;
if (timeout == 0) {
this.cancel();
displayText("finished");
return;
}
if (timeout >= 0) {
displayText("time remaining: " + String.valueOf(timeout / 1000));
a.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View arg0) {
Toast.makeText(getApplicationContext(), "Wrong Answer!!! ", Toast.LENGTH_LONG).show();
Intent openWordlist = new Intent("com.example.the_vocab_master.AA");
startActivity(openWordlist);
}
});
b.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View arg0) {
Toast.makeText(getApplicationContext(), "GREAT...!!! ", Toast.LENGTH_LONG).show();
}
});
}
//displayText("time remaining: " + String.valueOf(timeout / 1000));
}
};
Timer timer = new Timer();
timer.scheduleAtFixedRate(task, interval, interval);
}
private void displayText(final String text) {
this.runOnUiThread(new Runnable() {
#Override
public void run() {
mTextField.setText(text);
}
});
}
}

To cancel the timer use
timer.cancel();
in your onClick listener. It's very difficult to see in your code, because the indentation is very bad, but I think you need to declare your timer variable in the class, instead of in onCreate();
Additionally, I'd suggest you to take both setOnClickListener calls OUTSIDE of the timer run() method. What you're doing doesn't make sense.

Show Array of ImageView for 5 Seconds

I have a TableLayout with an Array of ImageView then when I clicked on menuInflater it'll appear for five second and then hide and a countdown start.
public boolean onOptionsItemSelected(MenuItem item) {
super.onOptionsItemSelected(item);
switch (item.getItemId()){
case R.id.txt1:
handler = new Handler (this);
Worker w = new Worker (handler);
Thread t = new Thread (w);
t.start();
return true;
protected int [] imgIds = {
R.id.img_1,R.id.img_2,R.id.img_3,R.id.img_4,R.id.img_5,R.id.img_6,
R.id.img_7,R.id.img_8,R.id.img_9,R.id.img_10,R.id.img_11,R.id.img_12,
};
public class Worker implements Runnable{
private Handler h;
public Worker (Handler h)
{
this.h = h;
}
#Override
public void run() {
for(int i=0; i<10; i++)
{
imgIds.setsetVisibility(View.INVISIBLE)
try{
Thread.sleep(1000);
}catch (InterruptedException e){
e.printStackTrace();
}
}
h.postDelayed(Worker,1000);
}
}
And then the ImageView hide and start the Game.
This Code is wrong so If anybody can help me.

Frame Animations will help you
Following snippet will guide you.
package com.org.sampleproject;
import android.app.Activity;
import android.graphics.drawable.AnimationDrawable;
import android.os.Bundle;
import android.os.Handler;
import android.view.Menu;
import android.view.View;
import android.widget.ImageView;
import android.widget.Toast;
public class MainActivity extends Activity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
AnimationDrawable animation = new AnimationDrawable();
animation.addFrame(getResources().getDrawable(R.drawable.img1), 1000); //1 Sec
animation.addFrame(getResources().getDrawable(R.drawable.img2), 1000); //1 Sec
animation.addFrame(getResources().getDrawable(R.drawable.img3), 1000); //1 Sec
animation.addFrame(getResources().getDrawable(R.drawable.img4), 1000); //1 Sec
animation.addFrame(getResources().getDrawable(R.drawable.img5), 1000); //1 Sec
animation.setOneShot(true);
final ImageView imageAnim = (ImageView) findViewById(R.id.image);
imageAnim.setBackgroundDrawable(animation);
animation.start();
new Handler().postDelayed(new Runnable() {
#Override
public void run() {
imageAnim.setVisibility(View.INVISIBLE);
//Perform Your Task Here
}
}, animation.getNumberOfFrames() * 1000);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
}

Maybe you can use a CountDownTimer :
http://developer.android.com/reference/android/os/CountDownTimer.html
protected int [] imgIds = {
R.drawable.img_1,R.drawable.img_2,...
};
new CountDownTimer(12000, 1000) {
public void onTick(long millisUntilFinished) {
img.setImageResource(R.drawable.my_image);
}