Question

我有Fragment可以拍照。一些片段具有常规图片和额外图片。这意味着我使用两个不同的RESULT CODES来拍摄我拍摄的照片。我得到的错误只是在我使用RESULT_PICTURE_EXTRA代码时，它似乎是随机的。

为什么在使用REQUEST_PICTURE_EXTRA时出现此错误？此外，如果它有帮助，我会在PopupWindow中显示此图片，但它不显示。

片段代码

private static final int REQUEST_PICTURE = 1;
private static final int REQUEST_PICTURE_EXTRA = 2;

private void showExtraPicture() {
    ImageView extraImage = (ImageView) view.findViewById(R.id.extra_image);

    if (step.getIsReqPictureFinished()) {
        try {
            FileInputStream fis = getActivity().openFileInput(step.getExtraImageFilename());
            Bitmap imgFromFile = BitmapFactory.decodeStream(fis);
            fis.close();
            extraImage.setImageBitmap(imgFromFile);
            extraImage.invalidate();
        } 
        catch (FileNotFoundException e) { e.printStackTrace(); } 
        catch (IOException e) { e.printStackTrace(); }
    }
}

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    if (requestCode == REQUEST_PICTURE && resultCode == Activity.RESULT_OK) {
        Bundle extras = data.getExtras();
        Bitmap image = (Bitmap) extras.get("data");

        ImageHandler imageHandler = new ImageHandler(getActivity());
        String filename = imageHandler.writeToFile(image, step.getChecklistId(), step.getOrder(), false);
        step.setImageFilename(filename);

        finishStep();
        showResult();
        checkIfAllFinished();
    }

    if (requestCode == REQUEST_PICTURE_EXTRA && resultCode == Activity.RESULT_OK) {
        Bundle extras = data.getExtras();
        Bitmap image = (Bitmap) extras.get("data");

        ImageHandler imageHandler = new ImageHandler(getActivity());
        String filename = imageHandler.writeToFile(image, step.getChecklistId(), step.getOrder(), true);
        step.setExtraImageFilename(filename);

        if (step.getReqPicture()) { step.setIsReqPictureFinished(true); }
        showExtraPicture();
        checkIfAllFinished();
    }
}

堆栈跟踪

01-31 14:42:54.192: E/AndroidRuntime(21536): FATAL EXCEPTION: main
01-31 14:42:54.192: E/AndroidRuntime(21536): java.lang.RuntimeException: Failure delivering result ResultInfo{who=android:fragment:0, request=2, result=-1, data=Intent { act=inline-data dat=content://media/external/images/media/3504 (has extras) }} to activity {com.medusa.checkit.android/com.medusa.checkit.android.StepActivity}: java.lang.NullPointerException
01-31 14:42:54.192: E/AndroidRuntime(21536):    at android.app.ActivityThread.deliverResults(ActivityThread.java:3205)
01-31 14:42:54.192: E/AndroidRuntime(21536):    at android.app.ActivityThread.handleSendResult(ActivityThread.java:3248)
01-31 14:42:54.192: E/AndroidRuntime(21536):    at android.app.ActivityThread.access$1200(ActivityThread.java:143)
01-31 14:42:54.192: E/AndroidRuntime(21536):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1289)
01-31 14:42:54.192: E/AndroidRuntime(21536):    at android.os.Handler.dispatchMessage(Handler.java:99)
01-31 14:42:54.192: E/AndroidRuntime(21536):    at android.os.Looper.loop(Looper.java:137)
01-31 14:42:54.192: E/AndroidRuntime(21536):    at android.app.ActivityThread.main(ActivityThread.java:4950)
01-31 14:42:54.192: E/AndroidRuntime(21536):    at java.lang.reflect.Method.invokeNative(Native Method)
01-31 14:42:54.192: E/AndroidRuntime(21536):    at java.lang.reflect.Method.invoke(Method.java:511)
01-31 14:42:54.192: E/AndroidRuntime(21536):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1004)
01-31 14:42:54.192: E/AndroidRuntime(21536):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:771)
01-31 14:42:54.192: E/AndroidRuntime(21536):    at dalvik.system.NativeStart.main(Native Method)
01-31 14:42:54.192: E/AndroidRuntime(21536): Caused by: java.lang.NullPointerException
01-31 14:42:54.192: E/AndroidRuntime(21536):    at com.medusa.checkit.android.StepFragment.showExtraPicture(StepFragment.java:388)
01-31 14:42:54.192: E/AndroidRuntime(21536):    at com.medusa.checkit.android.StepFragment.onActivityResult(StepFragment.java:547)
01-31 14:42:54.192: E/AndroidRuntime(21536):    at android.app.Activity.dispatchActivityResult(Activity.java:5367)
01-31 14:42:54.192: E/AndroidRuntime(21536):    at android.app.ActivityThread.deliverResults(ActivityThread.java:3201)
01-31 14:42:54.192: E/AndroidRuntime(21536):    ... 11 more

Answer 1

阅读您的错误消息：NullPointerException内发生showExtraPicture()。这就是为什么它只发生在REQUEST_PICTURE_EXTRA代码中。

您需要找到null的内容以及原因。这是在第388行，所以只有你知道，但我打赌view是null。

无论是否，你都不应该抓住你创建的根View（假设这是view引用的内容）。每次需要时，只需从附件Activity中找到您的观点：

getActivity().findViewById(R.id.extra_image);

或者片段的根视图也适用，如果其中包含R.id.extra_image：

getView().findViewById(R.id.extra_image);

而且，作为旁注，您应该最终关闭资源：请参阅FileInputStream documentation中的示例。

拍照后发送结果ResultInfo失败

1 个答案: