意思就是每隔一秒会回调一次方法onTick,然后30秒之后会回调onFinish方法。
package com.example.timerdemo;
import android.support.v7.app.ActionBarActivity;
import android.app.Activity;
import android.os.Bundle;
import android.os.CountDownTimer;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends Activity implements OnClickListener{
private TextView time;
private Button start;
private Button cancel;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//初始化控件
time = (TextView) findViewById(R.id.tv_time);
start = (Button) findViewById(R.id.bt_start);
cancel = (Button) findViewById(R.id.bt_cancel);
start.setOnClickListener(this);
cancel.setOnClickListener(this);
}
CountDownTimer timer=new CountDownTimer(30000, 1000){
@Override
public void onFinish() {
// TODO Auto-generated method stub
time.setText("结束");
}
@Override
public void onTick(long arg0) {
// TODO Auto-generated method stub
time.setText("剩余"+arg0/1000+"秒");
}
};
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
switch (arg0.getId()) {
case R.id.bt_start:
timer.start();
break;
case R.id.bt_cancel:
timer.cancel();
break;
default:
break;
}
}
}