Question

我的应用程序将原始文件夹中的文件复制到代码中写入的分配位置，我想要做的是显示一条Toast消息，说明文件是否已成功写入或是否已失败。

需要什么代码以及我将它放在我现有的代码欢呼中。

public class TrialActivity extends Activity {

private ProgressDialog progressDialog;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);


    runDialog(5);
}

private void runDialog(final int seconds)
{
    progressDialog = ProgressDialog.show(this, "Please Wait...", "unpacking patch in progress");

    new Thread(new Runnable(){
        public void run(){
            try {
                Thread.sleep(seconds * 1000);
                progressDialog.dismiss();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }).start();

    ((Button)findViewById(R.id.button1)).setOnClickListener(new View.OnClickListener()
    {
      public void onClick(View paramView)
      {

      }

   {

              InputStream in = null;
              OutputStream out = null;
  String filename="savegame.bin";           
  try {    

                in = getResources().openRawResource(R.raw.savegame);
                out = new FileOutputStream("/sdcard/Android/data/com.glu.android.brawler/files/" + filename);
                copyFile(in, out);
                in.close();
                in = null;
                out.flush();
                out.close();
                out = null;
              } catch(Exception e) {
                  Log.e("tag", e.getMessage());
                  Message message = Message.obtain();      
                  message.what = 1;               
                  mHandler.sendMessage(message);
              }       

      }
      private void copyFile(InputStream in, OutputStream out) throws IOException {
          byte[] buffer = new byte[1024];
          int read;
          while((read = in.read(buffer)) != -1){
            out.write(buffer, 0, read);

            Handler mHandler = new Handler() {
                public void handleMessage( Message msg ) 
                {  
                    Toast toast;
                        switch(msg.what) 
                        {          
                           case 1: // for success
                               toast = Toast.makeText(getBaseContext(), "File has been successfully written.", Toast.LENGTH_LONG);
                               toast.show();
                           break;
                           case 0: // for Error
                               toast = Toast.makeText(getBaseContext(), "Error occur during writting file.", Toast.LENGTH_LONG);
                               toast.show();
                           break;

                       }
               };
            };

          }
      }
      }
    );


}

}

Answer 1

您可以使用Handler类，在线程末尾调用处理程序。

但是personnaly我会选择AsyncTask类。此类允许您处理线程，并且在完成线程后，您可以对UI进行更改。

在Android开发者网站上阅读。

Answer 2

您可以在代码中使用处理程序来执行此操作。

你应该将消息传递给你需要在OS上显示的处理程序......如下所示......

Message message = Message.obtain();      
message.what = 1;  // success message               
mHandler.sendMessage(message);

＆安培;根据该消息显示处理程序中的Toast ......

Handler mHandler = new Handler() {
     public void handleMessage( Message msg ) 
     {  
         Toast toast;
             switch(msg.what) 
             {          
                case 1: // for success
                    toast = Toast.makeText(getBaseContext(), "File has been successfully written.", Toast.LENGTH_LONG);
                    toast.show();
                break;
                case 0: // for Error
                    toast = Toast.makeText(getBaseContext(), "Error occur during writting file.", Toast.LENGTH_LONG);
                    toast.show();
                break:

            }
    }

}

Answer 3

private void runDialog(final int seconds)
{
    progressDialog = ProgressDialog.show(this, "Please Wait...", "patch is being prepared");

    new Thread(new Runnable(){
        public void run(){
            try {
                Thread.sleep(seconds * 1000);
                progressDialog.dismiss();
                         runOnUiThread(new Runnable() {
                    public void run() {
                                 Toast.makeText(ActivityName.this,"Message",Toast.LENGTH_SHORT).show();
                                                   }});
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }).start();

    ((Button)findViewById(R.id.button1)).setOnClickListener(new View.OnClickListener()
    {
      public void onClick(View paramView)
      {

      }

   {

显示Android Toast成功/失败消息

3 个答案: