StackOverflow2013

Note that there are some explanatory texts on larger screens.

plurals

PODialogFragments with Gallery App using Android Support Library (rev.10) "Compability Package", V4 package for API 7 to API 16
text
Body
copied!<p>I've adapted the code from AOSP "Launcher2" WallpaperChooser & WallpaperChooserDialogFragment to be a standalone Gallery App, and I wanted it to work on API levels 7 up to API 16.</p> <p>To make it work for API levels < 11 I added the Android Support Library (rev.10) "Compability Package", V4 package.</p> <p>I based my changes in the compability package (android.support.v4.app.DialogFragment.java) on the suggestions from here: <a href="https://stackoverflow.com/questions/5637894/dialogfragments-with-devices-api-level-11">DialogFragments with devices api level < 11</a>.</p> <p>Otherwise the app would crash with an error ("DialogFragment can not be attached to a container view").</p> <p>However, the app refuses to work as intended when deployed to an actual Jelly Bean 4.1.1 device (Nexus S), but it works perfectly fine on the emulator.</p> <p>Tested & Works on:</p> <blockquote> <ul> <li>Android 2.1 Emulator (API 7)</li> <li>Android 2.2 Emulator (API 8)</li> <li>Android 2.3.3 Emulator (API 10)</li> <li>Android 4.0.3 Emulator (API 15)</li> <li><p>Android 4.1 Emulator (API 16)</p></li> <li><p>Android 2.3.7 Device (API 10)</p></li> </ul> </blockquote> <p>Tested & Doesn't Work on:</p> <blockquote> <ul> <li>Android 4.1.1 Device (API 16)</li> </ul> </blockquote> <p>When running on the 4.1.1 device, it never loads/displays the gallery images when tapping on them in the horizontal view.</p> <p>It only displays each picture after selecting and rotating the device, and then again, select a new picture, rotate again, and it displays correctly.</p> <p>I haven't managed to figure out the problem why it wouldn't work on a real device so any help is appreciated. If I remove the compability package and only targets API level +11, the app works on the real 4.1.1 device.</p> <p>This is the code for the app:</p> <p>GalleryDemo.java:</p> <pre><code>package gallery.android.demo; import android.support.v4.app.DialogFragment; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentActivity; import android.os.Bundle; public class GalleryDemo extends FragmentActivity { @Override public void onCreate(Bundle icicle) { super.onCreate(icicle); setContentView(R.layout.wallpaper_chooser_base); Fragment fragmentView = getSupportFragmentManager().findFragmentById(R.id.wallpaper_chooser_fragment); if (fragmentView == null) { DialogFragment fragment = GalleryDemoDialogFragment.newInstance(); fragment.show(getSupportFragmentManager(), "dialog"); } } } </code></pre> <p>GalleryDemoDialogFragment.java:</p> <pre><code>package gallery.android.demo; import android.support.v4.app.DialogFragment; import android.support.v4.app.FragmentActivity; import android.annotation.TargetApi; import android.app.Dialog; import android.content.DialogInterface; import android.content.res.Resources; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Canvas; import android.graphics.ColorFilter; import android.graphics.drawable.Drawable; import android.os.AsyncTask; import android.os.Build; import android.os.Bundle; import android.util.Log; import android.view.LayoutInflater; import android.view.View; import android.view.View.OnClickListener; import android.view.ViewGroup; import android.widget.AdapterView; import android.widget.BaseAdapter; import android.widget.Gallery; import android.widget.ImageView; import android.widget.ListAdapter; import android.widget.SpinnerAdapter; import android.widget.Toast; import java.util.ArrayList; @SuppressWarnings("deprecation") @TargetApi(16) public class GalleryDemoDialogFragment extends DialogFragment implements AdapterView.OnItemSelectedListener, AdapterView.OnItemClickListener { private static final String TAG = "GalleryDemoDialogFragment"; private static final String EMBEDDED_KEY = "gallery.android.demo.GalleryDemoDialogFragment.EMBEDDED_KEY"; private boolean mEmbedded; private Bitmap mBitmap = null; private ArrayList<Integer> mThumbs; private ArrayList<Integer> mImages; private WallpaperLoader mLoader; private WallpaperDrawable mWallpaperDrawable = new WallpaperDrawable(); public static GalleryDemoDialogFragment newInstance() { GalleryDemoDialogFragment fragment = new GalleryDemoDialogFragment(); fragment.setCancelable(true); return fragment; } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); if (savedInstanceState != null && savedInstanceState.containsKey(EMBEDDED_KEY)) { mEmbedded = savedInstanceState.getBoolean(EMBEDDED_KEY); } else { mEmbedded = isInLayout(); } } @Override public void onSaveInstanceState(Bundle outState) { outState.putBoolean(EMBEDDED_KEY, mEmbedded); } private void cancelLoader() { if (mLoader != null && mLoader.getStatus() != WallpaperLoader.Status.FINISHED) { mLoader.cancel(true); mLoader = null; } } @Override public void onDetach() { super.onDetach(); cancelLoader(); } @Override public void onDestroy() { super.onDestroy(); cancelLoader(); } @Override public void onDismiss(DialogInterface dialog) { super.onDismiss(dialog); FragmentActivity activity = getActivity(); if (activity != null) { activity.finish(); } } @Override public Dialog onCreateDialog(Bundle savedInstanceState) { findWallpapers(); return null; } @TargetApi(16) @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { findWallpapers(); if (mEmbedded) { View view = inflater.inflate(R.layout.wallpaper_chooser, container, false); switch (Build.VERSION.SDK_INT) { case Build.VERSION_CODES.ICE_CREAM_SANDWICH : view.setBackgroundDrawable(mWallpaperDrawable); break; case Build.VERSION_CODES.JELLY_BEAN : view.setBackground(mWallpaperDrawable); break; default: view.setBackgroundDrawable(mWallpaperDrawable); break; } final Gallery gallery = (Gallery) view.findViewById(R.id.gallery); gallery.setCallbackDuringFling(false); gallery.setOnItemSelectedListener(this); gallery.setAdapter(new ImageAdapter(getActivity())); View setButton = view.findViewById(R.id.set); setButton.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { int position = gallery.getSelectedItemPosition(); String[] wallpaperArray = getResources().getStringArray(R.array.wallpapers); String name = wallpaperArray[position]+".jpg"; Log.i(TAG, "Position="+position); Log.i(TAG, "Filename="+name); Toast.makeText(getActivity().getApplicationContext(), "(Save2SD)\n"+ "Position="+position+"\n"+ "Filename="+name+ "", Toast.LENGTH_SHORT).show(); } }); return view; } return null; } @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { } @Override public void onItemSelected(AdapterView<?> parent, View view, int position, long id) { if (mLoader != null && mLoader.getStatus() != WallpaperLoader.Status.FINISHED) { mLoader.cancel(); } Log.d(TAG, "onItemSelected()"); mLoader = (WallpaperLoader) new WallpaperLoader().execute(position); } @Override public void onNothingSelected(AdapterView<?> parent) { } private void findWallpapers() { mThumbs = new ArrayList<Integer>(24); mImages = new ArrayList<Integer>(24); final Resources resources = getResources(); final String packageName = resources.getResourcePackageName(R.array.wallpapers); addWallpapers(resources, packageName, R.array.wallpapers); addWallpapers(resources, packageName, R.array.extra_wallpapers); } private void addWallpapers(Resources resources, String packageName, int list) { final String[] extras = resources.getStringArray(list); for (String extra : extras) { int res = resources.getIdentifier(extra, "drawable", packageName); if (res != 0) { final int thumbRes = resources.getIdentifier(extra + "_small", "drawable", packageName); if (thumbRes != 0) { mThumbs.add(thumbRes); mImages.add(res); } } } } private class ImageAdapter extends BaseAdapter implements ListAdapter, SpinnerAdapter { private LayoutInflater mLayoutInflater; ImageAdapter(FragmentActivity activity) { mLayoutInflater = activity.getLayoutInflater(); } public int getCount() { return mThumbs.size(); } public Object getItem(int position) { return position; } public long getItemId(int position) { return position; } public View getView(int position, View convertView, ViewGroup parent) { View view; if (convertView == null) { view = mLayoutInflater.inflate(R.layout.wallpaper_item, parent, false); } else { view = convertView; } ImageView iv = (ImageView) view.findViewById(R.id.wallpaper_image); int thumbRes = mThumbs.get(position); iv.setImageResource(thumbRes); Drawable thumbDrawable = iv.getDrawable(); if (thumbDrawable != null) { thumbDrawable.setDither(true); } else { Log.e(TAG, "Error decoding thumbnail resId=" + thumbRes + " for wallpaper #" + position); } return view; } } private class WallpaperLoader extends AsyncTask<Integer, Void, Bitmap> { BitmapFactory.Options mOptions; WallpaperLoader() { mOptions = new BitmapFactory.Options(); mOptions.inDither = false; mOptions.inPreferredConfig = Bitmap.Config.ARGB_8888; } @Override protected Bitmap doInBackground(Integer... params) { if (isCancelled()) return null; try { return BitmapFactory.decodeResource(getResources(), mImages.get(params[0]), mOptions); } catch (OutOfMemoryError e) { return null; } } @Override protected void onPostExecute(Bitmap b) { if (b == null) return; if (!isCancelled() && !mOptions.mCancel) { if (mBitmap != null) { mBitmap.recycle(); } View v = getView(); if (v != null) { Log.d(TAG, "WallpaperLoader.onPostExecute() getView != null"); mBitmap = b; mWallpaperDrawable.setBitmap(b); // Doesn't appear to work on (physical) device with Jelly Bean (4.1.1)? v.postInvalidate(); } else { Log.d(TAG, "WallpaperLoader.onPostExecute(Bitmap b) getView == null"); mBitmap = null; mWallpaperDrawable.setBitmap(null); } mLoader = null; } else { b.recycle(); } } void cancel() { mOptions.requestCancelDecode(); super.cancel(true); } } private static class WallpaperDrawable extends Drawable { Bitmap mBitmap; int mIntrinsicWidth; int mIntrinsicHeight; void setBitmap(Bitmap bitmap) { Log.d(TAG, "WallpaperDrawable.setBitmap(Bitmap)"); mBitmap = bitmap; if (mBitmap == null) { Log.d(TAG, "WallpaperDrawable.setBitmap(Bitmap) mBitmap == null"); return; } mIntrinsicWidth = mBitmap.getWidth(); mIntrinsicHeight = mBitmap.getHeight(); } @Override public void draw(Canvas canvas) { if (mBitmap == null) { Log.d(TAG, "WallpaperDrawable.draw(Canvas) mBitmap == null"); return; } Log.d(TAG, "WallpaperDrawable.draw(Canvas)"); int width = canvas.getWidth(); int height = canvas.getHeight(); int x = (width - mIntrinsicWidth) / 2; int y = (height - mIntrinsicHeight) / 2; canvas.drawBitmap(mBitmap, x, y, null); } @Override public int getOpacity() { return android.graphics.PixelFormat.OPAQUE; } @Override public void setAlpha(int alpha) { } @Override public void setColorFilter(ColorFilter cf) { } } } </code></pre>

Querying!

Guidance

An individual column

Larger individual text columns get their own page to allow for proper reading.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload