Android CountDownTimer 实现倒计时功能

要实现一个发短信倒计时多少秒功能一般会采用Thread+Handler 这里介绍一个最近发现的比较好用的体统提供的CountDownTimer 比起Thread+Handler代码更加简洁
先上效果

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上代码:

package guandongchen.com.countdowntomerdemo;

import android.os.Bundle;
import android.os.CountDownTimer;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {

    private Button button;
    private CountDownTimer timer;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        button = (Button) findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                startTimer(10);
            }
        });
    }

    private  void startTimer(int time) {

        timer = new CountDownTimer(time*1000,1000){

            @Override
            public void onTick(long l) {
                button.setEnabled(false);
                button.setText((int)l/1000+"");
            }

            @Override
            public void onFinish() {
                button.setEnabled(true);
                button.setText("发送验证码");
            }
        };
        timer.start();
    }
    

    @Override
    protected void onDestroy() {
        super.onDestroy();

        if (timer!=null){

            timer.cancel();
        }
    }
}

关于CountDownTimer

官网介绍:https://developer.android.com/reference/android/os/CountDownTimer.html

image.png
看重点一句话就是芥末简单

Demo 下载地址:https://github.com/chenguandong/CountDownTomerDemo.git