使用方法:
(1)首先創建一個Handler對象
Handler handler = new Handler();
(2)創建一個Runnable對象
Runnable runnable = new Runnable(){
@Override
public void run() {
// TODO Auto-generated method stub
//要做的事情,這裏再次調用此Runnable對象,以實現每兩秒實現一次的定時器操作
handler.postDelayed(this, 2000);
}
};
(3)使用PostDelayed方法,兩秒後調用此Runnable對象
handler.postDelayed(runnable, 2000);
(4)關閉此定時器
handler.removeCallbacks(runnable);
可以異步效果,但Runnable的執行是在Handler對象所在的線程
如果其所在的線程是UI線程的話,Runnable中還是不能執行耗時操作,不然會ANR
eg:
public class XXX extends Activity
{
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.loading); // 顯示第1屏
Handler handler = new Handler();
handler.postDelayed(new splashhandler(), 2000); // 延遲2秒,再運行splashhandler的run()
}
class splashhandler implements Runnable
{
public void run()
{
startActivity(new Intent(getApplication(), SecondActivity.class)); // 顯示第2屏
XXX.this.finish(); // 結束第1屏
}
}
}