Android非同步任務AsyncTask

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 1 package com.example.asynctask; 2  3 import java.net.MalformedURLException; 4 import java.net.URL; 5  6 import android.app.Activity; 7 import android.os.AsyncTask; 8 import android.os.Bundle; 9 import android.util.Log;10 import android.view.Menu;11 import android.view.MenuItem;12 import android.widget.TextView;13 /**14  * 非同步任務實現，可以實現直接修改UI線程的控制項。15  * @author shb16  *17  */18 public class MainActivity extends Activity {19     private TextView tView;20     @Override21     protected void onCreate(Bundle savedInstanceState) {22         super.onCreate(savedInstanceState);23         setContentView(R.layout.activity_main);24         tView = (TextView) this.findViewById(R.id.textView1);25         TestAsyn testAsyn = new TestAsyn();26         try {27             testAsyn.execute(new URL("https://www.baidu.com/img/bd_logo1.png"));28         } catch (MalformedURLException e) {29             // TODO Auto-generated catch block30             e.printStackTrace();31         }32     }33     public class TestAsyn extends AsyncTask<URL,Integer,String> {34 35         @Override36         protected String doInBackground(URL... arg0) {37             // TODO Auto-generated method stub38             return arg0[0].toString();39         }40         @Override41         protected void onPostExecute(String result) {42             // TODO Auto-generated method stub43             super.onPostExecute(result);44             MainActivity.this.tView.setText(result);45         }46         @Override47         protected void onPreExecute() {48             // TODO Auto-generated method stub49             super.onPreExecute();50             Log.d("msg","onPreex");51         }52     }53 }

 

Android非同步任務AsyncTask