我在Logcat中收到意向传递错误，当我调用它时app会意外停止;
startActivityForResult(new Intent(Intent.ACTION_PICK,
android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI), 1);
或者就此而言;
startActivityForResult(new Intent(Intent.ACTION_PICK,
android.provider.MediaStore.Images.Media.INTERNAL_CONTENT_URI), 1);
然后用;
处理它@Override
protected void onActivityResult(int requestCode, int resultCode,
Intent intent) {
super.onActivityResult(requestCode, resultCode, intent);
if (resultCode == RESULT_OK) {
Uri contentURI = Uri.parse(intent.getDataString());
c = mSurfaceHolder.lockCanvas();
tempCanvas.setBitmap(mDrawing);
Bitmap tempBitmap = null;
ContentResolver cr = getContentResolver();
try {
InputStream in = cr.openInputStream(contentURI);
BitmapFactory.Options options = new BitmapFactory.Options();
options.inSampleSize=8;
tempBitmap = BitmapFactory.decodeStream(in,null,options);
}
catch (Exception ee) {
tempBitmap = BitmapFactory.decodeResource(getResources(),
R.drawable.icon);
}
tempCanvas.drawBitmap(tempBitmap, 0, 0, null);
c.drawBitmap(tempBitmap, 0, 0, null);
mSurfaceHolder.unlockCanvasAndPost(c);
}
}
错误显示“app已经意外停止”并显示logcat;
ERROR/AndroidRuntime(24768): java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1, result=-1, data=Intent { act=com.htc.HTCAlbum.action.ITEM_PICKER_FROM_COLLECTIONS dat=content://media/external/images/media/185 }} to activity {com.example.colorbook/com.example.colorbook.Colorbook}: java.lang.NullPointerException
Complete logcat as it finished gallery view activity and tried to return intent;
02-03 10:47:22.042: DEBUG/MainActivity(22984): [HTCAlbum][MainActivity][onPause]: Begin
02-03 10:47:22.042: DEBUG/MainActivity(22984): store mCurrentPosition_backup=0
02-03 10:47:22.042: DEBUG/DisplayManager(22984): store mCurrentPosition_backup=0
02-03 10:47:22.092: DEBUG/dalvikvm(22984): GC_EXPLICIT freed 1459 objects / 91880 bytes in 44ms
02-03 10:47:22.102: INFO/AlbumMapper(22984): Create thumbnail for: /mnt/sdcard/workspace/Colorbook/res/drawable/fileload.png
02-03 10:47:22.102: DEBUG/ThumbnailWorker(22984): [stopWorking] Stop working, now join #37, /mnt/sdcard/workspace/Colorbook/res/drawable/fileload.png
02-03 10:47:22.102: DEBUG/AlbumAdapter(22984): set thread priority to normal
02-03 10:47:22.102: DEBUG/AbstractViewGetter(22984): Raise getter prefetcher thread priority to normal.
02-03 10:47:22.102: DEBUG/AbstractViewGetter(22984): Join getter prefetch thread
02-03 10:47:22.102: DEBUG/AbstractViewGetter(22984): Getter prefetch join time: 2
02-03 10:47:22.102: DEBUG/AlbumMapper(22984): cancel current decode operation
02-03 10:47:22.182: DEBUG/AndroidRuntime(24768): Shutting down VM
02-03 10:47:22.182: WARN/dalvikvm(24768): threadid=1: thread exiting with uncaught exception (group=0x400259f8)
02-03 10:47:22.182: ERROR/AndroidRuntime(24768): FATAL EXCEPTION: main
02-03 10:47:22.182: ERROR/AndroidRuntime(24768): java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1, result=-1, data=Intent { act=com.htc.HTCAlbum.action.ITEM_PICKER_FROM_COLLECTIONS dat=content://media/external/images/media/185 }} to activity {com.example.colorbook/com.example.colorbook.Colorbook}: java.lang.NullPointerException
02-03 10:47:22.182: ERROR/AndroidRuntime(24768): at android.app.ActivityThread.deliverResults(ActivityThread.java:3734)
02-03 10:47:22.182: ERROR/AndroidRuntime(24768): at android.app.ActivityThread.handleSendResult(ActivityThread.java:3776)
02-03 10:47:22.182: ERROR/AndroidRuntime(24768): at android.app.ActivityThread.access$2800(ActivityThread.java:135)
02-03 10:47:22.182: ERROR/AndroidRuntime(24768): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2166)
02-03 10:47:22.182: ERROR/AndroidRuntime(24768): at android.os.Handler.dispatchMessage(Handler.java:99)
02-03 10:47:22.182: ERROR/AndroidRuntime(24768): at android.os.Looper.loop(Looper.java:144)
02-03 10:47:22.182: ERROR/AndroidRuntime(24768): at android.app.ActivityThread.main(ActivityThread.java:4937)
02-03 10:47:22.182: ERROR/AndroidRuntime(24768): at java.lang.reflect.Method.invokeNative(Native Method)
02-03 10:47:22.182: ERROR/AndroidRuntime(24768): at java.lang.reflect.Method.invoke(Method.java:521)
02-03 10:47:22.182: ERROR/AndroidRuntime(24768): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
02-03 10:47:22.182: ERROR/AndroidRuntime(24768): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
02-03 10:47:22.182: ERROR/AndroidRuntime(24768): at dalvik.system.NativeStart.main(Native Method)
02-03 10:47:22.182: ERROR/AndroidRuntime(24768): Caused by: java.lang.NullPointerException
02-03 10:47:22.182: ERROR/AndroidRuntime(24768): at com.example.colorbook.Colorbook.loadImageToCanvas(Colorbook.java:524)
02-03 10:47:22.182: ERROR/AndroidRuntime(24768): at com.example.colorbook.Colorbook.onActivityResult(Colorbook.java:231)
02-03 10:47:22.182: ERROR/AndroidRuntime(24768): at android.app.Activity.dispatchActivityResult(Activity.java:3931)
02-03 10:47:22.182: ERROR/AndroidRuntime(24768): at android.app.ActivityThread.deliverResults(ActivityThread.java:3730)
02-03 10:47:22.182: ERROR/AndroidRuntime(24768): ... 11 more
02-03 10:47:22.202: WARN/ActivityManager(97): Force finishing activity com.example.colorbook/.Colorbook
02-03 10:47:22.704: WARN/ActivityManager(97): Activity pause timeout for HistoryRecord{46207010 com.example.colorbook/.Colorbook}
02-03 10:47:22.742: DEBUG/Sensors(97): close_akm, fd=114
02-03 10:47:22.852: DEBUG/MainActivity(22984): [HTCAlbum][MainActivity][onStop]: Begin
02-03 10:47:22.902: DEBUG/dalvikvm(22984): GC_EXPLICIT freed 398 objects / 23264 bytes in 38ms
02-03 10:47:22.902: DEBUG/MainActivity(22984): [HTCAlbum][MainActivity][onDestroy]: Begin
02-03 10:47:22.912: DEBUG/OnlineDataCenter(22984): [HTCAlbum][OnlineDataCenter][unbindContext]: Begin
02-03 10:47:22.912: DEBUG/OnlineDataCenter(22984): [HTCAlbum][OnlineDataCenter][unbindContext]: com.htc.album.MainActivity@46075ec0context size: 0
02-03 10:47:22.912: DEBUG/OnlineDataCenter(22984): [HTCAlbum][OnlineDataCenter][unbindContext]: No more clients. release resources.
02-03 10:47:22.912: DEBUG/OnlineDataCenter(22984): [HTCAlbum][OnlineDataCenter][unbindContext]: End 0
02-03 10:47:22.912: DEBUG/ThumbnailWorker(22984): [stopWorking] Stop working, now join #-1, Decode Complete!!
02-03 10:47:22.912: DEBUG/AlbumAdapter(22984): set thread priority to normal
02-03 10:47:22.912: DEBUG/AlbumMapper(22984): cancel current decode operation
02-03 10:47:22.912: DEBUG/AlbumMapper(22984): cancel current decode operation
02-03 10:47:22.912: DEBUG/ThumbnailWorker(22984): [stopWorking] Stop working, now join #-1, Decode Complete!!
02-03 10:47:22.912: DEBUG/AlbumAdapter(22984): set thread priority to normal
02-03 10:47:22.912: DEBUG/AlbumAdapter(22984): Join worker thread in destroy
02-03 10:47:22.912: DEBUG/AlbumAdapter(22984): Join time: 0
02-03 10:47:22.922: INFO/MainActivity(22984): mWorker finishes jobs at onDestroy().
02-03 10:47:22.932: DEBUG/CollectionsActivity(22984): [HTCAlbum][CollectionsActivity][onDestroy]: Begin
02-03 10:47:22.932: DEBUG/AlbColAdap(22984): [HTCAlbum][AlbumCollectionsAdapter][onDestroy]: Begin
02-03 10:47:22.942: INFO/BatteryStatsImpl(97): notePhoneSignalStrengthLocked: 2->3
02-03 10:47:22.952: DEBUG/AlbColAdap(22984): [HTCAlbum][AlbumCollectionsAdapter][onDestroy]: End
第524行是这样的; c.drawBitmap（tempBitmap，0,0，null）;
答案 0 :(得分：5)
解决方案：
在SurfaceChanged中绘制位图，使用标记是否加载图像。
显然，在MediaStore活动返回选择之后，SurfaceView尚未准备就绪，