在三星 Galaxy S3 上我从图库中选择图像时，有时我会在压缩阶段收到空指针异常。
问题线
bm.compress(CompressFormat.JPEG, 85, bos);
方法
public String saveFile(Bitmap bm, int id) {
String file_path = Environment.getExternalStorageDirectory()
.getAbsolutePath() + "/Mk";
File dir = new File(file_path);
if (!dir.exists()) {
dir.mkdirs();
}
File file = new File(dir, "smaller" + id + ".jpeg");
FileOutputStream fOut;
try {
fOut = new FileOutputStream(file);
// bm.compress(Bitmap.CompressFormat.PNG, 85, fOut);
BufferedOutputStream bos = new BufferedOutputStream(fOut);
bm.compress(CompressFormat.JPEG, 85, bos);
if (bos != null) {
bos.flush();
bos.close();
}
if (fOut != null) {
fOut.flush();
fOut.close();
}
if (id == 1) {
photo1 = file.getPath();
} else if (id == 2) {
photo2 = file.getPath();
} else if (id == 3) {
photo3 = file.getPath();
}
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return "";
}
错误
08-09 10:31:06.740: E/AndroidRuntime(16358): FATAL EXCEPTION: main
08-09 10:31:06.740: E/AndroidRuntime(16358): java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=11, result=-1, data=Intent { dat=content://com.sec.android.gallery3d.provider/picasa/item/5813366421292566690 (has extras) }} to activity {ua.mirkvartir.android.frontend/ua.mirkvartir.android.frontend.AddFillActivityApp}: java.lang.NullPointerException
08-09 10:31:06.740: E/AndroidRuntime(16358): at android.app.ActivityThread.deliverResults(ActivityThread.java:3182)
08-09 10:31:06.740: E/AndroidRuntime(16358): at android.app.ActivityThread.handleSendResult(ActivityThread.java:3225)
08-09 10:31:06.740: E/AndroidRuntime(16358): at android.app.ActivityThread.access$1100(ActivityThread.java:140)
08-09 10:31:06.740: E/AndroidRuntime(16358): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1275)
08-09 10:31:06.740: E/AndroidRuntime(16358): at android.os.Handler.dispatchMessage(Handler.java:99)
08-09 10:31:06.740: E/AndroidRuntime(16358): at android.os.Looper.loop(Looper.java:137)
08-09 10:31:06.740: E/AndroidRuntime(16358): at android.app.ActivityThread.main(ActivityThread.java:4898)
08-09 10:31:06.740: E/AndroidRuntime(16358): at java.lang.reflect.Method.invokeNative(Native Method)
08-09 10:31:06.740: E/AndroidRuntime(16358): at java.lang.reflect.Method.invoke(Method.java:511)
08-09 10:31:06.740: E/AndroidRuntime(16358): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1006)
08-09 10:31:06.740: E/AndroidRuntime(16358): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:773)
08-09 10:31:06.740: E/AndroidRuntime(16358): at dalvik.system.NativeStart.main(Native Method)
08-09 10:31:06.740: E/AndroidRuntime(16358): Caused by: java.lang.NullPointerException
08-09 10:31:06.740: E/AndroidRuntime(16358): at ua.mirkvartir.android.frontend.AddFillActivityApp.saveFile(AddFillActivityApp.java:856)
08-09 10:31:06.740: E/AndroidRuntime(16358): at ua.mirkvartir.android.frontend.AddFillActivityApp.onActivityResult(AddFillActivityApp.java:801)
08-09 10:31:06.740: E/AndroidRuntime(16358): at android.app.Activity.dispatchActivityResult(Activity.java:5390)
08-09 10:31:06.740: E/AndroidRuntime(16358): at android.app.ActivityThread.deliverResults(ActivityThread.java:3178)
08-09 10:31:06.740: E/AndroidRuntime(16358): ... 11 more
onActivityResult
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
String a = "";
if (data == null) {
a = "null";
} else
a = data.toString();
Log.d("RealPAth", "resultCode " + resultCode + " data " + a);
if (requestCode == 12 && resultCode == RESULT_OK) {
} else if (requestCode == 11 && resultCode == RESULT_OK && null != data) {
Uri selectedImage = data.getData();
String picturePath = getRealPathFromURI(selectedImage);
pho1.setImageBitmap(decodeSampledBitmapFromResource(picturePath,
80, 60));
saveFile(decodeSampledBitmapFromResource(picturePath, 800, 800), 1);
} else if (requestCode == 22 && resultCode == RESULT_OK) {
} else if (requestCode == 21 && resultCode == RESULT_OK && null != data) {
Uri selectedImage = data.getData();
String picturePath = getRealPathFromURI(selectedImage);
pho2.setImageBitmap(decodeSampledBitmapFromResource(picturePath,
80, 60));
saveFile(decodeSampledBitmapFromResource(picturePath, 800, 800), 2);
} else if (requestCode == 32 && resultCode == RESULT_OK) {
} else if (requestCode == 31 && resultCode == RESULT_OK && null != data) {
Uri selectedImage = data.getData();
String picturePath = getRealPathFromURI(selectedImage);
pho3.setImageBitmap(decodeSampledBitmapFromResource(picturePath,
80, 60));
saveFile(decodeSampledBitmapFromResource(picturePath, 800, 800), 3);
}
}
decodeSampleBitmapFromResource
public static Bitmap decodeSampledBitmapFromResource(String path,
int reqWidth, int reqHeight) {
// First decode with inJustDecodeBounds=true to check dimensions
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeFile(path, options);
// Calculate inSampleSizeа
options.inSampleSize = calculateInSampleSize(options, reqWidth,
reqHeight);
// Decode bitmap with inSampleSize set
options.inJustDecodeBounds = false;
return BitmapFactory.decodeFile(path, options);
}