我们可以使用startactivityforresult复制和移动图像到另一个文件夹

I am a newbie in android app development. I have a simple question. I googled about it but couldn't find any satisfactory answer. My question is :
Can we copy and move images to another folder using startactivityforresult() method. If yes, then how can we pass the position of the selected images we want to move or copy ?

我是Android应用程序开发的新手。我有一个简单的问题。我用Google搜索,但找不到任何满意的答案。我的问题是:我们可以使用startactivityforresult()方法将图像复制并移动到另一个文件夹。如果是,那么我们如何通过我们想要移动或复制的所选图像的位置?

Thanks

1 个解决方案

#1

In your main activity:

在您的主要活动中:

Create new ArrayList to hold selected images:

创建新的ArrayList以保存所选图像:

ArrayList<Model_images> selectedImages = new ArrayList<Model_Images>();

ArrayList selectedImages = new ArrayList ();
Add all selected images to selectedImages in your adapter's onClick using:

将所有选定的图像添加到适配器onClick中的selectedImages:

selectedImages.add(al_images.get(position));

Then once you have the list of selected images, Build the intent and call the activity:

然后,一旦获得所选图像的列表,构建意图并调用活动:

Intent moveIntent = new Intent(this, MoveActivity.class);
moveIntent.putExtra("selected_images", selectedImages);
startActivityForResult(moveIntent, REQUEST_CODE); // REQUEST_CODE is a unique int value within your app for this intent.

Override onActivityResult to receive the response:

覆盖onActivityResult以接收响应:

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data)   {  
          super.onActivityResult(requestCode, resultCode, data);  
          // check if the request code is same as what is passed(REQUEST_CODE) 
          if(requestCode==REQUEST_CODE)  
          {  
                  if (resultCode == RESULT_OK){
                         //The called activity completed successfully. 
                         String message=data.getStringExtra("MESSAGE"); //The message passed along with result
                  }
          }
}

In your MoveActivity activity:

在您的MoveActivity活动中:

Get the passed ArrayList:

获取传递的ArrayList:

ArrayList<model_Images> selectedImages = new ArrayList<Model_Images>(); 
if(getIntent().getSerializableExtra("selected_images") != null)
       selectedImages = getIntent().getSerializableExtra("selected_images");

Move the images to destination folder:

将图像移动到目标文件夹:

//Move each selected file to destination
for (Model_Images image : selectedImages{
    File sourceImage = image.getFile(); //returns the image File from model class to be moved.
    File destinationImage = new File("path/to/destination", "filename.extension");
    moveFile(sourceImage, destinationImage);
}

//Method to move the file
private void moveFile(File sourceFile, File destFile) throws IOException {
    if (!sourceFile.exists()) {
        return;
    }

    FileChannel source = null;
    FileChannel destination = null;
    source = new FileInputStream(sourceFile).getChannel();
    destination = new FileOutputStream(destFile).getChannel();
    if (destination != null && source != null) {
        destination.transferFrom(source, 0, source.size());
    }
    if (source != null) {
        source.close();
    }
    if (destination != null) {
        destination.close();
    }
    source.delete();

}

Set the result to calling activity once done:

完成后将结果设置为调用活动:

// Set result back to the calling activity
Intent intent=new Intent();  
intent.putExtra("MESSAGE",message);  // Set a message for the calling activity
setResult(RESULT_OK,intent);  //RESULT_OK represents success result
finish();//finishing activity

P.S: handling storage permission is not discussed and is required to read/write.

P.S:不讨论处理存储权限,需要读/写。

#1