Android 最近捕获的文件事件拦截

Question

我想做的只是添加带有最近捕获的文件名的日志行。不幸的是，应用程序由于以下指示的错误而失败。下面提供的堆栈中的代码和错误。

提前致谢，

阿纳尔

java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=100, result=-1, data=null} to activity {az.justx.justx/az.justx.justx.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'android.net.Uri android.content.Intent.getData()' on a null object reference

private void interceptCameraButtonClick() {

    Button cameraButton = (Button) findViewById(R.id.cam);

    cameraButton.setOnClickListener(
            new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    Intent imageIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                    File imagesFolder = new File(Environment.getExternalStorageDirectory(), "MyImages");
                    imagesFolder.mkdirs(); // <----
                    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
                    File image = new File(imagesFolder, "AD_" + timeStamp + ".jpg");
                    Uri uriSavedImage = Uri.fromFile(image);
                    imageIntent.putExtra(MediaStore.EXTRA_OUTPUT, uriSavedImage);
                    startActivityForResult(imageIntent, 100);
                }
            }
    );

}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {

    Log.i("Test", Integer.toString(resultCode));

    if (requestCode == CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE) {
        if (resultCode == RESULT_OK) {
            // Image captured and saved to fileUri specified in the Intent
            Log.i("CALLED", "Image saved to:\n" +
                    data.getData());
            Toast.makeText(this, "Image saved to:\n" +
                    data.getData(), Toast.LENGTH_LONG).show();
        } else if (resultCode == RESULT_CANCELED) {
            // User cancelled the image capture
        } else {
            // Image capture failed, advise user
        }
    }

}

Answer 1

不要求相机在 Intent 中将 Uri 发送回 onActivityResult()。您已经知道 Uri 是什么，正如您在 EXTRA_OUTPUT 中所说的那样。您只需要使用该值。请务必将其包含在您保存的实例状态中，因为当相机应用程序位于前台时，您的进程可能会终止。

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