实用技巧——获取验证码的倒计时

效果图

源码：GitHub

CountDownTimer

创建对象，调用start的方法，开始倒计时

/** * 第一个参数：总时长（毫秒） * 第二个参数：多久执行一次回调（毫秒） */new CountDownTimer(10000, 1000) {    @Override    public void onTick(long millisUntilFinished) {        // TODO 显示倒计时    }    @Override    public void onFinish() {        // TODO 倒计时结束    }}.start();

封装

package kong.qingwei.countdowntimerdemo;import android.os.CountDownTimer;import android.widget.Button;/** * Created by kqw on 2016/5/11. * TimeCountUtil */public class TimeCountUtil extends CountDownTimer {    private Button mButton;    public TimeCountUtil(Button button, long millisInFuture, long countDownInterval) {        super(millisInFuture, countDownInterval);        this.mButton = button;    }    @Override    public void onTick(long millisUntilFinished) {        // 按钮不可用        mButton.setEnabled(false);        String showText = millisUntilFinished / 1000 + "秒后可重新发送";        mButton.setText(showText);    }    @Override    public void onFinish() {        // 按钮设置可用        mButton.setEnabled(true);        mButton.setText("重新获取验证码");    }}

Code(参考)

测试类

package kong.qingwei.countdowntimerdemo;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.Toast;public class MainActivity extends AppCompatActivity {    private Button mButton;    private TimeCountUtil mTimeCountUtil;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        mButton = (Button) findViewById(R.id.button);        mTimeCountUtil = new TimeCountUtil(mButton, 5000, 1000);        mButton.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                mTimeCountUtil.start();                // TODO 请求验证码                Toast.makeText(getApplicationContext(), "请求验证码", Toast.LENGTH_SHORT).show();            }        });    }}

XML

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context="kong.qingwei.countdowntimerdemo.MainActivity">    <Button        android:id="@+id/button"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:background="@drawable/selector_button"        android:text="点击发送验证码"/></RelativeLayout>

drawable

• selector_button.xml

  <?xml version="1.0" encoding="utf-8"?><selector xmlns:android="http://schemas.android.com/apk/res/android"><!-- 可用状态 --><item android:drawable="@drawable/shape_button_type1" android:state_enabled="true" /><!-- 不可用状态 --><item android:drawable="@drawable/shape_button_type2" android:state_enabled="false" /></selector>

• shape_button_type1.xml

  <?xml version="1.0" encoding="utf-8"?><shape xmlns:android="http://schemas.android.com/apk/res/android">    <solid android:color="#FF4583C9"/>    <corners android:radius="5dp"/>    <stroke android:width="1px" android:color="#FF4583C9" /></shape>

• shape_button_type2.xml

  <?xml version="1.0" encoding="utf-8"?><shape xmlns:android="http://schemas.android.com/apk/res/android">    <solid android:color="#FFDDDDDD"/>    <corners android:radius="5dp"/>    <stroke android:width="1px" android:color="#FFDDDDDD" /></shape>