Question

我有一个WebActivity为JavascriptInterface设置WebView，在接口上我创建了各种方法，使用Javascript调用不同的任务，其中一个是发送通过蓝牙的文件。该文件发送得很好，但我想告知用户该文件何时已被接受并在另一端完全传输。

我正在尝试在我的主WebActivity上使用onActivityResult，并尝试使用处理蓝牙传输的单独类，并且在JavascriptInterface上调用了一个方法，但是在文件发出后我没有得到任何回调结果成功发送：

//首次尝试

public class WebActivity extends ActionBarActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
         //some code here
         //Here I set the interface              
          myWebView.addJavascriptInterface(new WebAppInterface(this), "Android");
}

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

        if (requestCode == 0) {             

            //This message is shown after the file transfer has started but no 
            //finished
            Toast.makeText(this, "File Sent", Toast.LENGTH_SHORT).show();


            if(resultCode == Activity.RESULT_OK){                   
                //It doesn't work here either I always get Activity.RESULT_CANCELED (0)
                //flag afer the file transfer has started 
            }

        }

} 


}

//第二次尝试

public class BluetoothTasks {

//code here 

   private void startTransferIntent() {

    //some more code here

    Intent intent = new Intent();
    intent.setAction(Intent.ACTION_SEND);       

    intent.setType("text/plain");       

    File file_to_transfer = new File(Environment.getExternalStorageDirectory() +  
    "/txtTransfer.txt");        
    intent.putExtra(Intent.EXTRA_STREAM,Uri.fromFile(file_to_transfer));

    //some more code here

    Activity act = (Activity) mContext;
    act.startActivityForResult(intent, TRANSFER_RESULT);      

   }

   protected void onActivityResult(int requestCode, int resultCode,
        Intent data)  {

        if (requestCode == TRANSFER_RESULT) {
            //Not working here either
            //code that is not executed
        }

   }    

}

你能告诉我是否有办法做到这一点，如果有的话，怎么办呢？谢谢。

调用onActivityResult来确定何时收到文件

0 个答案: