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POAndroid - onPause and WidgetLocker
 

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  1. POAndroid - onPause and WidgetLocker
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    <p>I am writing a basic application to test the behavior of the accelerometer. Currently I am registering and unregistering the accelerometer like this:</p> <pre><code>public void pause() { mSensorManager.unregisterListener(this); } public void resume(Context context) { mSensorManager.registerListener(this, mAccelerometer, SensorManager.SENSOR_DELAY_FASTEST); } </code></pre> <p>I have the pause and resume methods triggered by the Activity, as the accelerometer is running in a child class. When I lock the screen the screen, the program breaks. I actually have to end the process to get the program to work again. I am currently using WidgetLocker. The program works fine with the stock lockscreen. My assumption is that resume is never being run.</p> <p>Is there a way to make sure that the sensor will be reregisterd? I don't want my program to break if they are using anything outside of the normal lockscreen.</p> <p>EDIT: Full Source Added. The main logic regarding this issue takes place at the bottom of MainGamePanel.java</p> <p>TiltBallActivity.java</p> <pre><code>package com.tornquist.nathan; import android.app.Activity; import android.content.pm.ActivityInfo; import android.os.Bundle; import android.view.Window; import android.view.WindowManager; public class TiltBallActivity extends Activity{ /** Called when the activity is first created. */ MainGamePanel viewPanel; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); //Window state functions. requestWindowFeature(Window.FEATURE_NO_TITLE); getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT); //This works without declaring a viewPanel instance here. //The instance declaration is needed to pass the //onPause and onResume commands though. viewPanel = new MainGamePanel(this); setContentView(viewPanel); } //Restarts the accelerometer after onPause protected void onResume() { viewPanel.resume(this); super.onResume(); } //Standard Method run when the Application loses focus. //This runs the pause() function in the viewPanel so that //the accelerometer can be paused. protected void onPause() { viewPanel.pause(); super.onPause(); } } </code></pre> <p>MainThread.java</p> <pre><code>package com.tornquist.nathan; import com.tornquist.nathan.MainGamePanel; import android.graphics.Canvas; import android.view.SurfaceHolder; public class MainThread extends Thread { private SurfaceHolder surfaceHolder; private MainGamePanel gamePanel; private boolean running; public void setRunning(boolean running) { this.running = running; } public MainThread(SurfaceHolder surfaceHolder, MainGamePanel gamePanel) { super(); this.surfaceHolder = surfaceHolder; this.gamePanel = gamePanel; } @Override public void run() { Canvas canvas; while (running) { canvas = null; // try locking the canvas for exclusive pixel editing on the surface try { canvas = this.surfaceHolder.lockCanvas(); synchronized (surfaceHolder) { // update game state this.gamePanel.update(); // draws the canvas on the panel this.gamePanel.onDraw(canvas); } } finally { // in case of an exception the surface is not left in // an inconsistent state if (canvas != null) { surfaceHolder.unlockCanvasAndPost(canvas); } } // end finally } } } </code></pre> <p>MainGamePanel.java</p> <pre><code>package com.tornquist.nathan; import android.app.Activity; import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.Paint.Style; import android.hardware.Sensor; import android.hardware.SensorEvent; import android.hardware.SensorEventListener; import android.hardware.SensorManager; import android.view.Display; import android.view.MotionEvent; import android.view.SurfaceHolder; import android.view.SurfaceView; public class MainGamePanel extends SurfaceView implements SensorEventListener, SurfaceHolder.Callback { //Variable Declarations. private MainThread thread; public int xColor; public int yColor; public int zColor; public float xPos; public float yPos; public float oldXPos; public float oldYPos; public int screenWidth; public int screenHeight; private SensorManager mSensorManager; private Sensor mAccelerometer; Paint paint; public MainGamePanel(Context context) { //Standard Initialization super(context); //This line adds a callback for the touch screen. //This allows you to actually capture touch input. getHolder().addCallback(this); thread = new MainThread(getHolder(),this); xColor = 100; yColor = 100; zColor = 100; paint = new Paint(); paint.setAntiAlias(true); Display display = ((Activity) context).getWindowManager().getDefaultDisplay(); screenWidth = display.getWidth(); screenHeight = display.getHeight(); yPos = screenHeight/2; xPos = screenWidth/2; oldYPos = yPos; oldXPos = xPos; //This registers the accelerometer. Without registering it, the onSensorChanged //event will never be called, and you cannot get the accelerometer values. mSensorManager = (SensorManager) context.getSystemService(Context.SENSOR_SERVICE); mAccelerometer = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER); mSensorManager.registerListener(this, mAccelerometer, SensorManager.SENSOR_DELAY_FASTEST); //Also required for touch input. setFocusable(true); } @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { } @Override public void surfaceCreated(SurfaceHolder holder) { // at this point the surface is created and // we can safely start the game loop thread.setRunning(true); thread.start(); } @Override public void surfaceDestroyed(SurfaceHolder holder) { boolean retry = true; while (retry) { try { thread.join(); retry = false; } catch (InterruptedException e) { // try again shutting down the thread } } } @Override public boolean onTouchEvent(MotionEvent event) { if (event.getAction() == MotionEvent.ACTION_DOWN) { // check if in the lower part of the screen we exit if (event.getY() &gt; getHeight() - 50) { thread.setRunning(false); ((Activity)getContext()).finish(); } if (xColor &lt; 235) xColor = xColor + 20; else xColor = 0; if (yColor &lt; 235) yColor = yColor + 20; else yColor = 0; if (zColor &lt; 235) zColor = zColor + 20; else zColor = 0; yPos = event.getY(); xPos = event.getX(); } return true; } @Override protected void onDraw(Canvas canvas) { //canvas.drawColor(Color.CYAN); canvas.drawColor(Color.rgb(xColor, yColor, zColor)); int xInvert = (int) (255 - xColor); int yInvert = (int) (255 - yColor); int zInvert = (int) (255 - zColor); paint.setColor(Color.rgb(xInvert, yInvert, zInvert)); paint.setStyle(Style.FILL); canvas.drawCircle(xPos, yPos, 50, paint); } public void update() { } @Override public void onAccuracyChanged(Sensor sensor, int accuracy) { } @Override public void onSensorChanged(SensorEvent event) { oldYPos = yPos; oldXPos = xPos; xColor = (int) (255 + (event.values[0])*11); if (xColor &gt; 255) xColor = 255; if (xColor &lt; 0) xColor = 0; yColor = (int) (255 + (event.values[1])*11); if (yColor &gt; 255) yColor = 255; if (yColor &lt; 0) yColor = 0; zColor = (int) (255 + (event.values[2])*11); if (zColor &gt; 255) zColor = 255; if (zColor &lt; 0) zColor = 0; xPos = xPos + -1*(event.values[0])*5; yPos = yPos + event.values[1]*5; if (xPos &lt; 50) xPos = 50; if (xPos &gt; screenWidth - 50) xPos = screenWidth - 50; if (yPos &lt; 50) yPos = 50; if (yPos &gt; screenHeight - 50) yPos = screenHeight - 50; if ((oldYPos == yPos) &amp;&amp; (oldXPos == xPos)) { invalidate(); } } public void pause() { mSensorManager.unregisterListener(this); //thread.setRunning(false); //((Activity)getContext()).finish(); } public void resume(Context context) { //mSensorManager = (SensorManager) context.getSystemService(Context.SENSOR_SERVICE); //mAccelerometer = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER); mSensorManager.registerListener(this, mAccelerometer, SensorManager.SENSOR_DELAY_FASTEST); } } </code></pre>
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    1. PO
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    1. This table or related slice is empty.
    1. PTQuestion
    1. USNathan Tornquist
    1. USNathan Tornquist
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      1. LTLinked
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    1. This table or related slice is empty.
    1. PO
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      1. POAndroid - onPause and WidgetLocker
      1. USNathan Tornquist
      1. VTBountyStart
    1. CODo you use `pause` and `resume`, or `onPause` and `onResume`?
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      1. POAndroid - onPause and WidgetLocker
      1. USasaelr
    2. COonPause and onResume. pause and resume are in a child class. They are executed by the onPause and onResume methods. As I said above, this works perfectly when I am not using WidgetLocker. I need to program for any situation though.
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      1. POAndroid - onPause and WidgetLocker
      1. USNathan Tornquist
    3. COCan you post your Activity code too?
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      1. POAndroid - onPause and WidgetLocker
      1. USReuben Scratton
 

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