1 package com.example.testhandler; 2 3 import android.os.Bundle; 4 import android.os.Handler; 5 import android.os.Message; 6 import android.app.Activity; 7 import android.view.Menu; 8 import android.widget.TextView; 9 10 public class MainActivity extends Activity { 11 12 Handler handler = null; 13 String textString = null; 14 TextView textView; 15 @Override 16 protected void onCreate(Bundle savedInstanceState) { 17 super.onCreate(savedInstanceState); 18 setContentView(R.layout.activity_main); 19 textView = (TextView) findViewById(R.id.text); 20 Runnable task = new Runnable() { 21 22 @Override 23 public void run() { 24 textString = "Hello World!"; 25 Message msg = new Message(); 26 msg.what = 0x123; 27 handler.sendMessage(msg); 28 } 29 }; 30 handler = new Handler(){ 31 32 @Override 33 public void handleMessage(Message msg) { 34 //super.handleMessage(msg); 35 if (msg.what == 0x123) { 36 textView.setText(textString); 37 } 38 } 39 40 }; 41 42 new Thread(task).start(); 43 44 } 45 46 @Override 47 public boolean onCreateOptionsMenu(Menu menu) { 48 // Inflate the menu; this adds items to the action bar if it is present. 49 getMenuInflater().inflate(R.menu.main, menu); 50 return true; 51 } 52 53 }
时间: 2024-08-10 00:07:12