Question

我试图使用外部Android摄像头将图像放入ImageView中，但是我得到了一个＆＃34;失败的结果ResultInfo＆＃34;错误。这是我的代码：

点击按钮启动相机应用

public void takePhoto(View v) {


    Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
        // Creating the File where the photo should go
        File photoFile = null;
        try {
            photoFile = createImageFile();
        } catch (IOException ex) {
            // Error occurred while creating the File
            Log.e(TAG,"something went wrong", ex);
            return;
        }
        // Continue only if the File was successfully created
        if (photoFile != null) {
            takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT,
                    Uri.fromFile(photoFile));
            startActivityForResult(takePictureIntent, REQUEST_CODE);
        }
    }
}

命名并创建临时文件。文件：

    String mCurrentPhotoPath;

private File createImageFile() throws IOException {
    // Create an image file name
    String timeStamp = new SimpleDateFormat("yyyyMMddHHmmss").format(new Date());
    String imageFileName = "JPEG" + timeStamp + "";
    File storageDir = Environment.getExternalStoragePublicDirectory(
            Environment.DIRECTORY_PICTURES);
    File image = File.createTempFile(
        imageFileName,  /* prefix */
        ".jpg",         /* suffix */
        storageDir      /* directory */
    );
    if(image.exists() == false) {
        image.getParentFile().mkdirs();
        image.createNewFile();
    }


    // Save a file: path for use with ACTION_VIEW intents
    mCurrentPhotoPath = "file:" + image.getAbsolutePath();
    Log.d(TAG,mCurrentPhotoPath);
    return image;
}

onactivityresult：

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

// bla bla bla... I never get to this point.

Log.d(TAG,"request code: " + requestCode + "result code: " + resultCode);



}

我的错误：

06-03 14:35:50.121: E/AndroidRuntime(19125): FATAL EXCEPTION: main
06-03 14:35:50.121: E/AndroidRuntime(19125): Process: com.example.moimeme, PID: 19125
06-03 14:35:50.121: E/AndroidRuntime(19125): java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1, result=-1, data=null} to activity {com.example.moimeme/com.example.moimeme.MainActivity}: java.lang.NullPointerException
06-03 14:35:50.121: E/AndroidRuntime(19125):    at android.app.ActivityThread.deliverResults(ActivityThread.java:3365)
06-03 14:35:50.121: E/AndroidRuntime(19125):    at android.app.ActivityThread.handleSendResult(ActivityThread.java:3408)
06-03 14:35:50.121: E/AndroidRuntime(19125):    at android.app.ActivityThread.access$1300(ActivityThread.java:135)
06-03 14:35:50.121: E/AndroidRuntime(19125):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1244)
06-03 14:35:50.121: E/AndroidRuntime(19125):    at android.os.Handler.dispatchMessage(Handler.java:102)
06-03 14:35:50.121: E/AndroidRuntime(19125):    at android.os.Looper.loop(Looper.java:136)
06-03 14:35:50.121: E/AndroidRuntime(19125):    at android.app.ActivityThread.main(ActivityThread.java:5017)
06-03 14:35:50.121: E/AndroidRuntime(19125):    at java.lang.reflect.Method.invokeNative(Native Method)
06-03 14:35:50.121: E/AndroidRuntime(19125):    at java.lang.reflect.Method.invoke(Method.java:515)
06-03 14:35:50.121: E/AndroidRuntime(19125):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
06-03 14:35:50.121: E/AndroidRuntime(19125):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
06-03 14:35:50.121: E/AndroidRuntime(19125):    at dalvik.system.NativeStart.main(Native Method)
06-03 14:35:50.121: E/AndroidRuntime(19125): Caused by: java.lang.NullPointerException
06-03 14:35:50.121: E/AndroidRuntime(19125):    at com.example.moimeme.MainActivity.onActivityResult(MainActivity.java:75)
06-03 14:35:50.121: E/AndroidRuntime(19125):    at android.app.Activity.dispatchActivityResult(Activity.java:5423)
06-03 14:35:50.121: E/AndroidRuntime(19125):    at android.app.ActivityThread.deliverResults(ActivityThread.java:3361)
06-03 14:35:50.121: E/AndroidRuntime(19125):    ... 11 more

我检查了很多堆栈问题并相应地更改了我的代码，但是无法让它工作，如果遗漏任何事情，对不起。顺便说一下 - 在nexus 5上调试和测试。

提前感谢，并且......我刚刚开始使用android平台，请原谅代码中的小说问题/错误：）

Answer 1

好吧，我最终找到了解决方案。如果有人需要它，请在此处发布。

如果使用：

intent.putExtra(MediaStore.EXTRA_OUTPUT,
outputFileUri);

你正在传递额外的“EXTRA_OUTPUT”。当您传递此额外内容时，您已经指定了存储捕获图像的位置。由于您已经知道了位置，因此传入onActivityResult（）的Intent将为null。即数据将为空。

这就是为什么当你试图通过

获取获取Uri时的原因

Uri uri = data.getData();

这将导致NullPointerException。因此，您只需要在onActivityResult中使用原始路径，而不是从getData请求它。

在android上启动摄像头时无法提供结果ResultInfo

1 个答案: