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Android实现倒计时30分钟功能

2017-05-15 16:18 525 查看

以30分钟为例写的一个倒计时：
直接上代码

public class MainActivity extends AppCompatActivity {
private int minute = 30;//这是分钟
private int second = 0;//这是分钟后面的秒数。这里是以30分钟为例的，所以，minute是30，second是0
private TextView timeView;
private Timer timer;
private TimerTask timerTask;
//这是接收回来处理的消息
private Handler handler = new Handler() {
public void handleMessage(Message msg) {
if (minute == 0) {
if (second == 0) {
timeView.setText("Time out !");
if (timer != null) {
timer.cancel();
timer = null;
}
if (timerTask != null) {
timerTask = null;
}
} else {
second--;
if (second >= 10) {
timeView.setText("0" + minute + ":" + second);
} else {
timeView.setText("0" + minute + ":0" + second);
}
}
} else {
if (second == 0) {
second = 59;
minute--;
if (minute >= 10) {
timeView.setText(minute + ":" + second);
} else {
timeView.setText("0" + minute + ":" + second);
}
} else {
second--;
if (second >= 10) {
if (minute >= 10) {
timeView.setText(minute + ":" + second);
} else {
timeView.setText("0" + minute + ":" + second);
}
} else {
if (minute >= 10) {
timeView.setText(minute + ":0" + second);
} else {
timeView.setText("0" + minute + ":0" + second);
}
}
}
}
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
requestWindowFeature(Window.FEATURE_NO_TITLE);
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
timeView = (TextView) findViewById(R.id.tv);
timeView.setText(minute + ":" + second);
timerTask = new TimerTask() {
@Override
public void run() {
Message msg = new Message();
msg.what = 0;
handler.sendMessage(msg);
}
};
timer = new Timer();
timer.schedule(timerTask, 0, 1000);
}
@Override
protected void onDestroy() {
if (timer != null) {
timer.cancel();
timer = null;
}
if (timerTask != null) {
timerTask = null;
}
minute = -1;
second = -1;
super.onDestroy();
}
@Override
protected void onStart() {
super.onStart();
}
@Override
protected void onStop() {
super.onStop();
}
@Override
protected void onResume() {
super.onResume();
}
@Override
protected void onRestart() {
super.onRestart();
}
@Override
protected void onPause() {
super.onPause();
}
}

ok，这就完成了。

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。

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