各种线程总结-优快云博客

本文介绍了在Android应用中如何正确地从后台线程更新用户界面的方法。包括使用runOnUiThread、View.post、Handler发送消息以及AsyncTask等不同方式来实现长时间运行操作后的UI更新。

1.public void onClick(View v) {
    Thread t = new Thread(){
    public void run(){
// Long time comsuming operation
   }
   };
   t.start();
}
public void onClick(View v) {
Thread t = new Thread(){
  public void run(){
   // Long time consuming operation
   _activity.runOnUiThread(new Runnable() {

    @Override
    public void run() {
     _activity.setStatus("Long Operation Completed");

    }
   });
  }
};
t.start();
}
2.

public void onClick(View v) {
// TODO Auto-generated method stub
Thread t = new Thread(){
  @Override
  public void run() {
   // Long time consuming operation
   status.post(new Runnable() {

    @Override
    public void run() {
     status.setText("Long Operstion Completed");

    }
   });
  }
};
t.start();
}
3.

public void onClick(View v) {
// TODO Auto-generated method stub
Thread t = new Thread(){
  @Override
  public void run() {
   // Long time consuming operation
   status.postDelayed(new Runnable() {

    @Override
    public void run() {
     status.setText("Long Operstion Completed");

    }
   }, 1000);
  }
};
t.start();
}

private Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
// Code to process the response and update UI.
}
};

public void onClick(View v) {
Thread t = new Thread(){
  public void run(){
   // Long time comsuming operation
   Message myMessage=new Message();
   Bundle resBundle = new Bundle();
   resBundle.putString("status", "SUCCESS");
   myMessage.obj=resBundle;
   handler.sendMessage(myMessage);
  }
};
t.start();
}

public class LongTimeConsumingOperation extends AsyncTask<String, Void, String> {

@Override
protected String doInBackground(String... params) {
// perform Long time consuming operation
return null;
}

/* (non-Javadoc)
* @see android.os.AsyncTask#onPostExecute(java.lang.Object)
*/
@Override
protected void onPostExecute(String result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
}

/* (non-Javadoc)
* @see android.os.AsyncTask#onPreExecute()
*/
@Override
protected void onPreExecute() {
// TODO Auto-generated method stub
super.onPreExecute();
}

/* (non-Javadoc)
* @see android.os.AsyncTask#onProgressUpdate(Progress[])
*/
@Override
protected void onProgressUpdate(Void... values) {
// TODO Auto-generated method stub
super.onProgressUpdate(values);
}

}

public void onClick(View v) {
new LongTimeConsumingOperation().execute("");
}