我必须启动相机，当用户拍完照片后，我必须拍摄并在 View 中显示。

查看http://developer.android.com/guide/topics/media/camera.html我做了:

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        bLaunchCamera = (Button) findViewById(R.id.launchCamera);
        bLaunchCamera.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Log.d(TAG, "lanzando camara");

                //create intent to launch camera
                Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);

                imageUri = getOutputMediaFileUri(MEDIA_TYPE_IMAGE); //create a file to save the image
                intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri); //set the image file name

                //start camera
                startActivityForResult(intent, CAMERA_REQUEST);
            }
        });

/**
     * Create a File Uri for saving image (can be sued to save video to)
     **/
    private Uri getOutputMediaFileUri(int mediaTypeImage) {
        return Uri.fromFile(getOutputMediaFile(mediaTypeImage));
    }

    /**
     * Create a File  for saving image (can be sued to save video to)
     **/
    private File getOutputMediaFile(int mediaType) {
        //To be safe, is necessary to check if SDCard is mounted

        File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),
                (String) getResources().getText(R.string.app_name));

        //create the storage directory if it does not exist
        if (!mediaStorageDir.exists()) {
            if (!mediaStorageDir.mkdirs()) {
                Log.d(TAG, "failed to create directory");
                return null;
            }
        }

        //Create a media file name

        String timeStamp = new SimpleDateFormat("ddMMyyyy_HHmmss").format(new Date());
        File mediaFile;

        if (mediaType == MEDIA_TYPE_IMAGE) {
            mediaFile = new File(mediaStorageDir.getPath() + File.separator + "IMG_" + timeStamp + ".jpg");

        } else {
            return null;
        }
        return mediaFile;
    }

@Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if(requestCode == CAMERA_REQUEST) {
            if(resultCode == RESULT_OK) {
                //Image captured and saved to fileUri specified in Intent
                Toast.makeText(this, "image saved to:\n" + data.getData(), Toast.LENGTH_LONG).show();
                Log.d(TAG, "lanzando camara");
            } else if(resultCode == RESULT_CANCELED) {
                //user cancelled the image capture;
                Log.d(TAG, "usuario a cancelado la captura");
            } else {
                //image capture failed, advise user;
                Log.d(TAG, "algo a fallado");
            }
        }
    }

图片完成后，应用程序在尝试发送“Toast”信息时崩溃，因为“数据”为空。

但如果我调试应用程序，我可以看到图像已保存。

所以我的问题是:如何获取 onActivityResult 中的路径？

最佳答案

您面临的问题是，每当我们从相机 Intent 中选择图像时，它可能会完成调用它的 Activity ，因此您创建的 imageUri 对象在您返回时将为 null。

所以你需要在退出 Activity 时保存它(转到相机 Intent )，就像这样 -

    /**
     * Here we store the file url as it will be null after returning from camera
     * app
     */
    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);

        // save file url in bundle as it will be null on screen orientation
        // changes
        outState.putParcelable("file_uri", mImageUri);
    }

并在您返回 Activity 时取回它 -

    @Override
    protected void onRestoreInstanceState(Bundle savedInstanceState) {
        super.onRestoreInstanceState(savedInstanceState);

        // get the file url
        mImageUri = savedInstanceState.getParcelable("file_uri");
    }

您的代码看起来不错，您只需要在其中添加此更改即可。

关于android - 如何在onActivityresult中获取图片路径(Intent数据为null)，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/32329461/