一种android定时器写法

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先定义定时器，只要启动一下四行代码，定时器则开始，并且在等待8秒后才触发一次，且仅此一次。

mHandler nHandler = new mHandler();

Message msg = new Message();
msg.what = 0x123;

nHandler.sendMessageDelayed(msg, 8000);

当启动以上代码，8秒钟后进入定时器内部类函数

class mHandler extends Handler {
@Override
public void handleMessage(Message msg) {
if (msg.what == 0x123) {

new AlertDialog.Builder(getActivity())
.setMessage("是否已经上车")
.setPositiveButton("是", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(getActivity(), "已经上车", Toast.LENGTH_SHORT).show();
}
})

.setNegativeButton("否", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(getActivity(), "还没上车", Toast.LENGTH_SHORT).show();
}
})

.show();

}
}
}

需要定时器的话，可结合以下程序使用：

private Runnable runnablereturn = null;private Handler handlblereturn = new Handler();

runnablereturn = new Runnable() {         @Override         public void run() {            handlblereturn.postDelayed(this, 3000);            mHandler nHandler = new mHandler();            Message msg = new Message();            msg.what = 0x129;            //nHandler.sendMessageDelayed(msg, 8000);            nHandler.sendMessage(msg);         }      };      handlblereturn.postDelayed(runnablereturn, 3000);   }}

handlblereturn.removeCallbacks(runnablereturn);

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