Any class is under View NEEDS to be in the Main Thread. On Tuesday, May 1, 2012 2:09:15 PM UTC-4, Ab wrote: > > This TestActivity mimics some behavior in my app, which casues an ANR on > the Samsung Note ( running Android version 2.3.6). It did not produce an > ANR on a few other devices I tried, including 2 different Samsung devices > both with 2.3.6. > > Based on the traces.txt file, the GUI thread appears to get stuck while > painting an ImageButton. No idea why this happens, but the traces.txt is > pastebin-ed below. > > The Activity creates a layout with a lot of ImageButtons, each of which > will cause the entire layout to invalidate when pressed. It then starts a > new thread which renders a Bitmap into a canvas. The Bitmap is painted > into the canvas one line at a time, by using Canvas.drawBitmap(int[]....); > the ANR occurs regardless of the pixel values of the Bitmap, so the test > app just uses an instantiated int[] (in which all values are 0). If I > randomly press the buttons on the screen, the application will ANR after > 10-30seconds. > > I don't think the ANR is dependent on the width and height values of the > Bitmap being rendered, or the dimensions of the Bitmap that is used as the > parameter in the Canvas' constructor. However, it is dependent on the > canvas.scale(.36f, .36f) that occurs prior to the bitmap rendering. I'm > not sure if values other than ".36" cause the ANR, but the ANR does not > occur if no scaling happens prior to the drawBitmap call. Also, the ANR > does not occur unless the Canvas object is created with a Bitmap as its > parameter. > > So, my guess is that this is somehow related to the Samsung Note's native > implementation of Canvas.drawBitmap. Any ideas what would cause the GUI > thread to be blocked and how it can be prevented? > > http://pastebin.com/hummn87H > > public class TempActivity extends Activity implements > android.view.View.OnClickListener > { > LinearLayout contentView; > public void onCreate(Bundle savedInstanceState) > { > super.onCreate(savedInstanceState); > > Log.e("", ""+1); > > contentView = new LinearLayout(this); > contentView.setOrientation(LinearLayout.VERTICAL); > > //add a few rows of image buttons > contentView.addView(initRow()); > contentView.addView(initRow()); > contentView.addView(initRow()); > contentView.addView(initRow()); > contentView.addView(initRow()); > contentView.addView(initRow()); > > setContentView(contentView); > > RenderThread task1 = new RenderThread(); > task1.start(); > } > > public class RenderThread extends Thread > { > public void run() > { > Paint paint = new Paint(); > Bitmap bitmap = Bitmap.createBitmap(500, 500, > Config.ARGB_8888); > > int width = 800; > int height = 1000; > > int[] pixels = new int[width]; > > while (1!= 0) > { > Canvas canvas = new Canvas(bitmap); > canvas.scale(.36f, .36f); > for(int i = 0; i < height; i++) > { > canvas.drawBitmap(pixels, 0, width, 0, i, width, 1, false, paint); > } > } > } > } > > private View initRow() > { > LinearLayout row = new LinearLayout(this); > row.setOrientation(LinearLayout.HORIZONTAL); > ImageButton button = new ImageButton(this); > button.setImageResource(R.drawable.icon); > button.setOnClickListener(this); > row.addView(button); > button = new ImageButton(this); > button.setImageResource(R.drawable.icon); > button.setOnClickListener(this); > row.addView(button); > button = new ImageButton(this); > button.setImageResource(R.drawable.icon); > button.setOnClickListener(this); > row.addView(button); > button = new ImageButton(this); > button.setImageResource(R.drawable.icon); > button.setOnClickListener(this); > row.addView(button); > button = new ImageButton(this); > button.setImageResource(R.drawable.icon); > button.setOnClickListener(this); > row.addView(button); > button = new ImageButton(this); > button.setImageResource(R.drawable.icon); > button.setOnClickListener(this); > row.addView(button); > > return row; > } > > @Override > public void onClick(View v) > { > contentView.postInvalidate(); > } > } > >
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