Android自定义短信倒计时view流程分析

import android.content.Context;
import android.os.Handler;
import android.os.Message;
import android.util.AttributeSet;
import androidx.annotation.NonNull;
import com.juexing.payassistant.activity.login.RegisterActivity;
import java.lang.ref.WeakReference;
//待优化为了保存倒计时状态线程延迟一秒关闭所有的子线程
//qq也是如此
public class CountDownTimeView extends androidx.appcompat.widget.AppCompatButton {
private static volatile int i=60;
//用来保存倒计时时间的中转变量
private static volatile int j=0;
private static TimeHandler handler;
//每次启动活动判断i是否为0来读取倒计时时间
public static int getI() {
return i;
}
//RegisterActivity是调用该控件的活动需要在oncreate中将对象传入
public void setActivity(RegisterActivity activity){
handler=new TimeHandler(activity);
}
public static void setI(int i) {
CountDownTimeView.i = i;
}
//防止多次重复点击发送设置的变量
private static volatile boolean send=true;
private class TimeHandler extends Handler {
WeakReference<RegisterActivity  timeActivityWeakReference;
public TimeHandler(RegisterActivity registerActivity){
this.timeActivityWeakReference = new WeakReference< (registerActivity);
}
@Override
public void handleMessage(@NonNull Message msg) {
super.handleMessage(msg);
RegisterActivity activity=timeActivityWeakReference.get();//获取活动
switch (msg.what){
case 1:
if(i 0){
activity.getmessage. setText(i+"s");
}else {
}
break;
case 2:
activity.getmessage. setText("重新获取");
break;
case 3:
i=j-1;
j=0;
send=false;
handler.postDelayed(runnable,1000);
}
}
};
public CountDownTimeView(Context context) {
super(context);
}
public CountDownTimeView(Context context, AttributeSet attrs) {
super(context, attrs);
}
//网络请求短信成功后调用
public void onStart(CountDownTimeView view){
if(send){
if(i==0){
i=60;
}
handler.postDelayed(runnable,1000);
view.setText(i+"s");
send=false;
}else {
//为了显示不突兀自动减去一秒
view.setText(i-1+"s");
j=i;
//将i设置为0是将所有线程运行完毕关闭释放内存
i=0;
handler.removeCallbacksAndMessages(null);
//因为线程调度随机性所以要延迟一秒发送保证子线程关闭
Message message=Message.obtain();
message.what=3;
handler.sendMessageDelayed(message,1000);
//     i=j;
}
}
//设置成静态保证唯一性
public static Runnable runnable=new Runnable() {
@Override
public void run() {
if(i 0){
i--;
Message message=new Message();
message.what=1;
handler.handleMessage(message);
handler.postDelayed(runnable,1000);
}else {
if(j!=0){
}else {
send=true;
Message message=new Message();
message.what=2;
handler.handleMessage(message);
}
}
}
};
}

getmessage.setActivity(this);
if(getmessage.getI()<60){
if(getmessage.getI() 0){
getmessage.onStart(getmessage);
}else {
getmessage.setText("重新获取");
}
}
}