从特定文件夹中选取图像

Question

我参考此link以显示来自内部存储器中特定路径的图像。但它只与ACTION_VIEW工作，但是当我使用ACTION_PICK它没有显示相同的路径，而是它的简单的开放画廊。显示后有没有任何方法可以从特定路径中选择单个图像？

public class NewActivity extends AppCompatActivity{ 
 

 
    private static final String file_path = Environment.getExternalStorageDirectory().getAbsolutePath()+"/fun"; 
 
    private File[] allFiles ; 
 
    private String imagepath ; 
 

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

 
     File folder = new File(file_path); 
 
     allFiles = folder.listFiles(); 
 

 
     findViewById(R.id.start).setOnClickListener(new View.OnClickListener() { 
 
      @Override 
 
      public void onClick(View v) { 
 

 
       new SingleMediaScanner(NewActivity.this, allFiles[0]); 
 

 
      } 
 
     }); 
 
    } 
 

 
    public class SingleMediaScanner implements MediaScannerConnection.MediaScannerConnectionClient { 
 

 
     private MediaScannerConnection mMs; 
 
     private File mFile; 
 

 
     public SingleMediaScanner(Context context, File f) { 
 
      mFile = f; 
 
      mMs = new MediaScannerConnection(context, this); 
 
      mMs.connect(); 
 
     } 
 

 
     public void onMediaScannerConnected() { 
 
      mMs.scanFile(mFile.getAbsolutePath(), null); 
 
     } 
 

 
     public void onScanCompleted(String path, Uri uri) { 
 
      Intent intent = new Intent(Intent.ACTION_PICK); 
 
      intent.setData(uri); 
 
      startActivityForResult(intent, 100); 
 
      mMs.disconnect(); 
 
     } 
 

 
    } 
 

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

 
     if(requestCode==100 && resultCode==RESULT_OK){ 
 
      try{ 
 
       Uri selectedImageUri = data.getData(); 
 
       String[] projection = {MediaStore.Images.Media.DATA}; 
 
       //Cursor cursor_gallery = activity.managedQuery(selectedImageUri, projection, null, null, null); 
 
       Cursor cursor_gallery = getContentResolver().query(selectedImageUri, projection, null, null, null); 
 
       int column_index = 0; 
 
       if (cursor_gallery != null) { 
 
        column_index = cursor_gallery.getColumnIndexOrThrow(MediaStore.Images.Media.DATA); 
 
        cursor_gallery.moveToFirst(); 
 
        imagepath = cursor_gallery.getString(column_index); 
 
        cursor_gallery.close(); 
 
       } 
 
       System.out.println("sammy_imagepath "+imagepath); 
 

 
      }catch(Exception e){ 
 
       e.printStackTrace(); 
 
      } 
 
     } 
 
    } 
 
}

Answer 1

当你做一个ACTION_PICK意图，你问其他应用程序来执行操作（让他们选择一个文件）。没有办法确保它以某种方式工作 - 用户可以轻松添加另一个实现ACTION_PICK的应用程序并执行其他操作。所以不，没有办法确保它会从这条路上选择。如果你确实需要这个，你需要实现你自己的选择器，而不是使用ACTION_PICK。