java - 如何将图片添加到我自己的图库

Question

我想从我的应用程序中拍摄照片并将其保存在我自己的图库中。之后我需要照片的全名。与

private void dispatchTakePictureIntent(int actionCode) {
  Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
  this.startActivityForResult(takePictureIntent, actionCode);
}

照片将保存在默认图库中。如果我正确阅读了文档，那么我可以使用

设置名称

takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, "MyFileName");

如何创建自己的图库并在那里保存图像而不是默认图库？

拍照并保存在图库中后，将调用结果函数。除了图像之外，如何获取文件的全名。

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
  switch(requestCode){
    case actionCode:
      // get the image
      InputStream stream = this.getContentResolver().openInputStream(data.getData());

      // How to get the file name?
      break;
    default:
  }
}

使用 extra 设置名称后，将不会调用 onActivityResult 函数。如果没有这个额外的东西，我就可以使用图像。

Answer 1

捕获这样的图像:

private static final int CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE = 100;
private Uri fileUri;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

// create Intent to take a picture and return control to the calling application
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);

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

// start the image capture Intent
startActivityForResult(intent, CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE);
}

getOutputMediaFileUri 像这样:

public static final int MEDIA_TYPE_IMAGE = 1;
public static final int MEDIA_TYPE_VIDEO = 2;

/** Create a file Uri for saving an image or video */
private static Uri getOutputMediaFileUri(int type){
  return Uri.fromFile(getOutputMediaFile(type));
}

/** Create a File for saving an image or video */
private static File getOutputMediaFile(int type){
// To be safe, you should check that the SDCard is mounted
// using Environment.getExternalStorageState() before doing this.

File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(
          Environment.DIRECTORY_PICTURES), "MyCameraApp");
// This location works best if you want the created images to be shared
// between applications and persist after your app has been uninstalled.

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

// Create a media file name
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
File mediaFile;
if (type == MEDIA_TYPE_IMAGE){
    mediaFile = new File(mediaStorageDir.getPath() + File.separator +
    "IMG_"+ timeStamp + ".jpg");
} else if(type == MEDIA_TYPE_VIDEO) {
    mediaFile = new File(mediaStorageDir.getPath() + File.separator +
    "VID_"+ timeStamp + ".mp4");
} else {
    return null;
}

return mediaFile;
}

并获取保存的图像 fileUri，如下所示:

private static final int CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE = 100;
private static final int CAPTURE_VIDEO_ACTIVITY_REQUEST_CODE = 200;

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE) {
    if (resultCode == RESULT_OK) {
        // Image captured and saved to fileUri specified in the Intent
        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
    }
}

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