Question

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，但无法找到任何满意的答案。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，那么我们如何传递我们想要移动或复制的所选图像的位置？

由于

Answer 1

在您的主要活动中：

创建新的ArrayList以保存所选图像：

ArrayList<Model_images> selectedImages = new ArrayList<Model_Images>();
将所有选定的图像添加到适配器中的selectedImages onClick使用：

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

然后，如果您拥有所选图像的列表，请构建意图和打电话给活动：

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.

覆盖onActivityResult以接收回复：

@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
                  }
          }
}

在MoveActivity活动中：

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");

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();

}

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：不讨论处理存储权限，需要读/写。

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

1 个答案: