import java.util.Timer;
import java.util.TimerTask;
import android.app.Activity;
import android.os.Bundle;
public class TestTimer_Wrong extends Activity {
Timer timer = new Timer();
TimerTask task = new TimerTask(){
public void run() {
setTitle("hear me?");
}
};
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
timer.schedule(task, 10000);
}
}
TimerTask 里面直接做UI更新,没有在UIThread里面。与Java的EDT线程,是同一概念。
正确写法一 : 交由UI Thread处理。
import android.app.Activity;
import android.os.Bundle;
public class TestTimer extends Activity {
Timer timer = new Timer();
TimerTask task = new TimerTask(){
public void run() {
runOnUiThread(new Runnable(){
@Override
public void run() {
setTitle("hear me?");
}});
}
};
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
timer.schedule(task, 10000);
}
}
正确写法二 :由Handler处理UI 更新。
import java.util.Timer;
import java.util.TimerTask;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
public class TestTimer extends Activity {
Timer timer = new Timer();
Handler handler = new Handler(){
public void handleMessage(Message msg) {
switch (msg.what) {
case 1:
setTitle("hear me?");
break;
}
super.handleMessage(msg);
}
};
TimerTask task = new TimerTask(){
public void run() {
Message message = new Message();
message.what = 1;
handler.sendMessage(message);
}
};
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
timer.schedule(task, 10000);
}
}
转载: http://blog.csdn.net/rcyl2003/archive/2010/08/04/5787971.aspx