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) {@Overridepublic void onTick(long millisUntilFinished) {// TODO 显示倒计时}@Overridepublic 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;}@Overridepublic 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);}@Overridepublic 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;@Overrideprotected 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() {@Overridepublic 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>