Android实现倒计时效果-获取验证码

Posted 2021-08-30 hequnwang10

获取验证码后，验证码几分钟之内有效，现在实现这个效果。

1、布局文件

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".TimeCount">

    <Button
        android:id="@+id/btn_getcode"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:backgroundTint="#E91E63"
        android:text="倒计时"
        android:textSize="24sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.545"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.499" />
</androidx.constraintlayout.widget.ConstraintLayout>

2、TimeCount.java

import androidx.appcompat.app.AppCompatActivity;

import android.graphics.Color;
import android.os.Bundle;
import android.os.CountDownTimer;
import android.view.View;
import android.widget.Button;

public class TimeCount extends AppCompatActivity {

    private TimeCountAPI time;
    private Button btnGetcode;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_time_count);
        time = new TimeCountAPI(300000, 1000);
        btnGetcode=(Button) findViewById(R.id.btn_getcode);
        btnGetcode.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                time.start();
            }
        });
    }
    class TimeCountAPI extends CountDownTimer {

        public TimeCountAPI(long millisInFuture, long countDownInterval) {
            super(millisInFuture, countDownInterval);
        }
        @Override
        public void onTick(long millisUntilFinished) {
            btnGetcode.setBackgroundColor(Color.parseColor("#B6B6D8"));
            btnGetcode.setClickable(false);
            btnGetcode.setText("("+millisUntilFinished / 1000 +") 秒后可重新发送");
        }
        @Override
        public void onFinish() {
            btnGetcode.setText("重新获取验证码");
            btnGetcode.setClickable(true);
            btnGetcode.setBackgroundColor(Color.parseColor("#4EB84A"));

        }
    }
}