Android 線程 實例介紹

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class EX3Activity extends Activity {
 public static final int UPDATE_DATA = 0;
 public static final int UPDATE_COMPLETED = 1;
 TextView mTextView;
 Button mButton;
Handler mHandler = new Handler() {
  public void handleMessage(Message msg) {
   switch (msg.what) {
   case UPDATE_DATA:
    mTextView.setText("正在更新來自線程的數據：" + msg.arg1 + "%......");

break;


case UPDATE_COMPLETED:
    mTextView.setText("已完成來自線程的數據");
    break;
   }
}
 };
/* Called when the activity is first created. /
 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
setContentView(R.layout.main);
  mTextView = (TextView) findViewById(R.id.textView1);
  mButton = (Button) findViewById(R.id.button1);
  mButton.setOnClickListener(new View.OnClickListener() {
@Override
   public void onClick(View v) {
//     TODO Auto-generated method stub
     new Thread() {
     @Override
     public void run() {
     // TODO Auto-generated method stub

 for (int i = 0; i < 100; i++) {
 try {
 Thread.sleep(30);
 } catch (Exception e) {
 // TODO: handle exception
 e.printStackTrace();
 }
 Message m = mHandler.obtainMessage();
 m.what = UPDATE_DATA;
 m.arg1 = i + 1;
 mHandler.sendMessage(m);
 }
 mHandler.sendEmptyMessage(UPDATE_COMPLETED);
 }
 }.start();


}
  });
}
}</pre>