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我的应用程序必须制作一张图片，并在 imageview 中显示它。我得到了这个工作，但出乎意料的是它不再。

这是我的按钮代码：

public void makeFoto(View v) {
    Calendar cal = Calendar.getInstance();
    File file = new File(Environment.getExternalStorageDirectory(), (subject.getText().toString() + cal.getTimeInMillis()+".jpg"));
    if (!file.exists()) {
        try {
            file.createNewFile();
        } catch (IOException e) {
            e.printStackTrace();
        }
    } else {
        file.delete();
        try {
            file.createNewFile();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    capturedImageUri = Uri.fromFile(file);
    Intent photoIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    photoIntent.putExtra(MediaStore.EXTRA_OUTPUT, capturedImageUri);
    startActivityForResult(photoIntent, CAMERA_PHOTO_REQUEST);
}

这是在我的 onActivityResult 中：

    @Override
protected void onActivityResult(int requestCode, int resultCode, Intent data){
    super.onActivityResult(requestCode, resultCode, data);
    if(resultCode == RESULT_OK){
        switch(requestCode) {
        case CAMERA_PHOTO_REQUEST:
            Uri img = capturedImageUri;
            imv.setImageURI(img);
        case CHOOSE_PHOTO_REQUEST:
            try {
                Uri selectedImage = data.getData();
                InputStream imageStream = getContentResolver().openInputStream(selectedImage);
                Bitmap yourSelectedImage = BitmapFactory.decodeStream(imageStream);
                imv.setImageBitmap(yourSelectedImage);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}

如您所见，我有两个结果，一个用于拍照，另一个用于从图库中选择图片。这是我得到的错误：

    04-03 18:16:29.207: E/AndroidRuntime(1478): FATAL EXCEPTION: main
04-03 18:16:29.207: E/AndroidRuntime(1478): java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=100, result=-1, data=null} to activity {com.example.icomplain/com.example.icomplain.Home}: java.lang.NullPointerException
04-03 18:16:29.207: E/AndroidRuntime(1478):     at android.app.ActivityThread.deliverResults(ActivityThread.java:2976)
04-03 18:16:29.207: E/AndroidRuntime(1478):     at android.app.ActivityThread.handleSendResult(ActivityThread.java:3019)
04-03 18:16:29.207: E/AndroidRuntime(1478):     at android.app.ActivityThread.access$1100(ActivityThread.java:122)
04-03 18:16:29.207: E/AndroidRuntime(1478):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1176)
04-03 18:16:29.207: E/AndroidRuntime(1478):     at android.os.Handler.dispatchMessage(Handler.java:99)
04-03 18:16:29.207: E/AndroidRuntime(1478):     at android.os.Looper.loop(Looper.java:137)
04-03 18:16:29.207: E/AndroidRuntime(1478):     at android.app.ActivityThread.main(ActivityThread.java:4340)
04-03 18:16:29.207: E/AndroidRuntime(1478):     at java.lang.reflect.Method.invokeNative(Native Method)
04-03 18:16:29.207: E/AndroidRuntime(1478):     at java.lang.reflect.Method.invoke(Method.java:511)
04-03 18:16:29.207: E/AndroidRuntime(1478):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
04-03 18:16:29.207: E/AndroidRuntime(1478):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
04-03 18:16:29.207: E/AndroidRuntime(1478):     at dalvik.system.NativeStart.main(Native Method)
04-03 18:16:29.207: E/AndroidRuntime(1478): Caused by: java.lang.NullPointerException
04-03 18:16:29.207: E/AndroidRuntime(1478):     at com.example.icomplain.Home.onActivityResult(Home.java:154)
04-03 18:16:29.207: E/AndroidRuntime(1478):     at android.app.Activity.dispatchActivityResult(Activity.java:4649)
04-03 18:16:29.207: E/AndroidRuntime(1478):     at android.app.ActivityThread.deliverResults(ActivityThread.java:2972)
04-03 18:16:29.207: E/AndroidRuntime(1478):     ... 11 more
04-03 18:16:31.478: I/Process(1478): Sending signal. PID: 1478 SIG: 9
04-03 18:17:36.507: D/dalvikvm(1539): GC_FOR_ALLOC freed 47K, 2% free 14131K/14339K, paused 42ms
04-03 18:17:36.507: I/dalvikvm-heap(1539): Grow heap (frag case) to 14.868MB for 1048592-byte allocation
04-03 18:17:36.597: D/dalvikvm(1539): GC_CONCURRENT freed 1K, 2% free 15154K/15431K, paused 4ms+3ms
04-03 18:17:36.667: D/dalvikvm(1539): GC_FOR_ALLOC freed 0K, 2% free 15154K/15431K, paused 26ms
04-03 18:17:36.677: I/dalvikvm-heap(1539): Grow heap (frag case) to 16.646MB for 1865972-byte allocation
04-03 18:17:36.727: D/dalvikvm(1539): GC_CONCURRENT freed 0K, 2% free 16976K/17287K, paused 4ms+3ms

来自日志的图像可以在这里查看。

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1 回答 1

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  1. 我猜你break;之前需要case CHOOSE_PHOTO_REQUEST:。
  2. 这是一个可选的，但不幸的是，确定输出文件名完全取决于设备上安装的相机应用程序或用户选择的相机应用程序，即使它在MediaStore.EXTRA_OUTPUT. 所以你应该看到data.getParcelableExtra(Intent.EXTRA_STREAM)和data.getData()除了capturedImageUri。
于 2013-04-16T10:55:19.003 回答