在目前许多应用中都会用到，输入手机号码，获取验证码，然后开始倒计时，这里主要功能点击“获取验证码”倒计时开始，在最后附上DEMO，demo效果图如下：
这里是主界面代码：
public class MainActivity extends AppCompatActivity {
private CountDownTimerButton get_ver_btn;
private EditText username_et;
private EditText vercode_et;
private EditText pwd_et;
private Button login_btn;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
initCountDownBtn();
}
private void initCountDownBtn() {
get_ver_btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
get_ver_btn.setStartCountDownText("再次获取");
get_ver_btn.startCountDownTimer(60000,1000);
}
});
}
private void initView(){
get_ver_btn=(CountDownTimerButton) findViewById(R.id.btn_get_ver);
username_et=(EditText) findViewById(R.id.et_username);
vercode_et=(EditText) findViewById(R.id.et_ver_code);
pwd_et=(EditText) findViewById(R.id.et_pw);
login_btn=(Button) findViewById(R.id.btn_submit);
}
@Override
protected void onDestroy() {
super.onDestroy();
get_ver_btn.onDestroy();
}其他部分代码：
package com.example.administrator.countdowntimerbdemo.utils;
import android.os.Handler;
import android.os.Message;
import android.os.SystemClock;
/**
* Created by abc on 2019/10/10.
*/
public abstract class CountDownTimer {
/**
* Millis since epoch when alarm should stop.
*/
private final long mMillisInFuture;
/**
* The interval in millis that the user receives callbacks
*/
private final long mCountdownInterval;
private long mStopTimeInFuture;
/**
* boolean representing if the timer was cancelled
*/
private boolean mCancelled = false;
/**
* @param millisInFuture The number of millis in the future from the call
* to {@link #start()} until the countdown is done and {@link #onFinish()}
* is called.
* @param countDownInterval The interval along the way to receive
* {@link #onTick(long)} callbacks.
*/
public CountDownTimer(long millisInFuture, long countDownInterval) {
mMillisInFuture = millisInFuture-1;
mCountdownInterval = countDownInterval;
}
/**
* Cancel the countdown.
*/
public synchronized final void cancel() {
mCancelled = true;
mHandler.removeMessages(MSG);
}
/**
* Start the countdown.
*/
public synchronized final CountDownTimer start() {
mCancelled = false;
if (mMillisInFuture <= 0) {
onFinish();
return this;
}
mStopTimeInFuture = SystemClock.elapsedRealtime() + mMillisInFuture;
mHandler.sendMessage(mHandler.obtainMessage(MSG));
return this;
}
/**
* Callback fired on regular interval.
* @param millisUntilFinished The amount of time until finished.
*/
public abstract void onTick(long millisUntilFinished);
/**
* Callback fired when the time is up.
*/
public abstract void onFinish();
private static final int MSG = 1;
// handles counting down
private Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
synchronized (CountDownTimer.this) {
if (mCancelled) {
return;
}
final long millisLeft = mStopTimeInFuture - SystemClock.elapsedRealtime();
if (millisLeft <= 0) {
onFinish();
} else {
long lastTickStart = SystemClock.elapsedRealtime();
onTick(millisLeft);
// take into account user's onTick taking time to execute
long delay = lastTickStart + mCountdownInterval - SystemClock.elapsedRealtime();
// special case: user's onTick took more than interval to
// complete, skip to next interval
while (delay < 0) delay += mCountdownInterval;
sendMessageDelayed(obtainMessage(MSG), delay);
}
}
}
};
}
这里是自定义代码：
package com.example.administrator.countdowntimerbdemo.widget;
import android.content.Context;
import android.graphics.Color;
import android.graphics.drawable.GradientDrawable;
import android.text.TextUtils;
import android.util.AttributeSet;
import android.util.Log;
import com.example.administrator.countdowntimerbdemo.R;
import com.example.administrator.countdowntimerbdemo.utils.TimerUtil;
/**
* Created by abc on 2019/10/10.
*/
public class CountDownTimerButton extends android.support.v7.widget.AppCompatButton {
private final String TAG = CountDownTimerButton.class.getSimpleName();
private final int STATE_STARTCOUNT = 0;
private final int STATE_STOPCOUNT = 1;
private String startCountDownStateColor;
private String stopCountDownStateColor;
private String startCountDownText;
private String stopCountDownText;
private TimerUtil mTimerUtil;
private CountDownStateChangeListener mCountDownStateChangeListener;
public interface CountDownStateChangeListener{
void onStartCount(long millsUtilFinished);
void onFinishCount();
}
public CountDownTimerButton(Context context) {
this(context, null);
}
public CountDownTimerButton(Context context, AttributeSet attrs) {
this(context, attrs, R.attr.buttonStyle);
}
public CountDownTimerButton(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
// changeBackGroundColor(STATE_STOPCOUNT);
}
public void onDestroy() {
Log.d(TAG, "run in onDestroy,currentTimeMillis: " + System.currentTimeMillis());
if (mTimerUtil != null) {
mTimerUtil.cancel();
mTimerUtil = null;
}
initState();
}
private void initState() {
changeBackGroundColor(STATE_STOPCOUNT);
setClickable(true);
setText(stopCountDownText);
}
public void setCountDownStateChangeListener(CountDownStateChangeListener listener){
mCountDownStateChangeListener=listener;
}
public void setStartCountDownStateColor(String color) {
startCountDownStateColor = color;
}
public void setStopCountDownColor(String color) {
stopCountDownStateColor = color;
}
public void setStartCountDownText(String startCountDownText) {
this.startCountDownText = startCountDownText;
}
private void setStopCountDownText(String stopCountDownText) {
this.stopCountDownText = stopCountDownText;
}
public void startCountDownTimer(final long millisInFuture, final long countDownInterval) {
if (mTimerUtil != null) {
mTimerUtil.cancel();
mTimerUtil = null;
}
setStopCountDownText(getText().toString());
mTimerUtil = new TimerUtil(millisInFuture, countDownInterval);
mTimerUtil.setCountDownTimerListener(new TimerUtil.CountDownTimerListener() {
@Override
public void startCount(long millsUtilFinished) {
if (mCountDownStateChangeListener!=null){
mCountDownStateChangeListener.onStartCount(millsUtilFinished);
return;
}
changeBackGroundColor(STATE_STARTCOUNT);
setClickable(false);
setText(startCountDownText+"(" + millsUtilFinished / 1000 + ")");
}
@Override
public void finishCount() {
if (mCountDownStateChangeListener!=null){
mCountDownStateChangeListener.onFinishCount();
return;
}
setText(stopCountDownText);
setClickable(true);
changeBackGroundColor(STATE_STOPCOUNT);
}
});
mTimerUtil.start();
}
private void changeBackGroundColor(int state) {
try {
GradientDrawable drawable = (GradientDrawable) getBackground();
switch (state) {
case STATE_STARTCOUNT:
if (TextUtils.isEmpty(startCountDownStateColor)) {
drawable.setColor(Color.parseColor("#d3d2d6"));
} else {
drawable.setColor(Color.parseColor(startCountDownStateColor));
}
break;
case STATE_STOPCOUNT:
if (TextUtils.isEmpty(stopCountDownStateColor)) {
drawable.setColor(Color.parseColor("#ffffff"));
} else {
drawable.setColor(Color.parseColor(stopCountDownStateColor));
}
break;
default:
break;
}
} catch (ClassCastException e) {
e.fillInStackTrace();
}
}
}
以上就是部分代码，需要看详细代码。
CSDN：下载
GIT:下载
