android realizes countdown function (start pause end in 0 seconds)

In this paper, we share the specific code of android to realize countdown function for your reference. The specific contents are as follows

[Thinking]: Execute the task with periodic delay through timer, update the timing information in handler, and end the periodic task of timer at the end of timing.

-Add 1 TextView and Button control to the layout file, and get id to TextView and Button in the onCreate method;

xml layout code:

<Button
   android:id="@+id/button_start_timer"
   android:layout_width="0dp"
   android:layout_height="wrap_content"
   android:layout_weight="1"
   android:layout_gravity="center_vertical"
   android:gravity="center"
   android:text=" Begin "
   android:textSize="12sp"
   />

<TextView
   android:id="@+id/textViewTime24"
   android:layout_width="0dp"
   android:layout_height="wrap_content"
   android:layout_gravity="center_vertical"
   android:layout_weight="2"
   android:gravity="center"
   android:text="24"
   android:textColor="#33ff00"
   android:textSize="60sp" />

java code

package com.example.wlf.gamerecorder.gameon;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.os.Handler;
import com.example.wlf.gamerecorder.R;

import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;

public class SimpleGameonActivity extends AppCompatActivity {

 private final static int COUNT = 1;
 private final static int TOTAL_TIME_24 = 24;
 private TextView textViewTime24;
 Timer timer;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_simple_gameon);
  textViewTime24=(TextView)findViewById(R.id.textViewTime24);//24 Seconds countdown 
  final Button button_start_timer = (Button)findViewById(R.id.button_start_timer);
  button_start_timer.setOnClickListener(new View.OnClickListener() {
   @Override
   public void onClick(View v) {
    String str = button_start_timer.getText().toString();// Get button string 
    if(str.equals(" Begin ")){ // Toggle button text 
     button_start_timer.setText(" Suspend ");
     initView();
    }
    else{
     button_start_timer.setText(" Begin ");
     timer.cancel();// Terminate a thread 
    }
   }
  });
 }
 public void initView(){
  //countDown = (TextView) findViewById(R.id.textViewTime24);
  timer = new Timer();
  /**
   *  Every 1 Send in seconds 1 Secondary message to handler Update UI
   * schedule(TimerTask task, long delay, long period)
   */
  timer.schedule(new TimerTask() {
   @Override
   public void run() {
    handler.sendEmptyMessage(COUNT);
   }
  }, 0, 1000);
 }
 private Handler handler = new Handler(){
  int num = TOTAL_TIME_24;
  public void handleMessage(android.os.Message msg) {
   switch (msg.what) {
    case COUNT:
     textViewTime24.setText(String.valueOf(num));
     if(num == 0)
      timer.cancel();//0 End of seconds 
     num--;
     break;
    default:
     break;
   }
  };
 };
}