Clock service Android implementation of alarm clock

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ClockService Android service application realizes alarm clock

establish ClockActivity, You can enter a time （ Use Time The text box ）, Create another ClockService It's used for timing , When it's time , In the Activity To give notice of （ Underneath TextView It shows that “ Time out ”）.
Be careful ： This is where Service operation Activity



The experimental steps ： Use BoundService Way to start the service
1、 First define the layout file , I won't go over it here

3、 Define a Service Service , Then define a class MyBinder The inner class of , Used to get Service Object and the Service Object state . Methods that must be implemented in inner classes onBind Method returns MyBinder service object . Define a... In an inner class getHandler Method to get Handler Object is used for MainActivity and MyService Message passing between .

Handler The key message passing code is as follows ：

4、 establish MainActivity Click events in ,

5、 Service binding needs to be created ServiceConnection Object and implement the corresponding methods , And then rewriting onServiceConnected Method to get the background Service, The code is as follows ：

- Activity_main.xml Code :

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:orientation="vertical">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="110dp"
        android:layout_marginHorizontal="20dp"
        android:orientation="horizontal">

        <TextView
            android:layout_width="150dp"
            android:layout_height="80dp"
            android:layout_marginTop="15dp"
            android:background="@drawable/shape"
            android:gravity="center_horizontal"
            android:text=" alarm clock "
            android:textAlignment="center"
            android:textSize="50sp"></TextView>

        <EditText
            android:autofillHints="true"
            android:hint="10:10:10"
            android:id="@+id/num"
            android:layout_width="match_parent"
            android:layout_height="80dp"
            android:layout_marginLeft="15dp"
            android:layout_marginTop="5dp"
            android:background="@drawable/shape"
            android:gravity="center"
            android:inputType="time"
            android:textSize="35sp"></EditText>
    </LinearLayout>

    <Button
        android:id="@+id/btnStart"
        android:layout_width="match_parent"
        android:layout_height="80dp"
        android:layout_marginHorizontal="20dp"
        android:layout_marginTop="15dp"
        android:background="@drawable/shape"
        android:text=" Start "
        android:textSize="50sp"></Button>

    <TextView
        android:id="@+id/text1"
        android:layout_width="match_parent"
        android:layout_height="300dp"
        android:layout_margin="20dp"
        android:background="@drawable/shape"
        android:gravity="center"
        android:text=" count down "
        android:textSize="100sp"></TextView>
</LinearLayout>

- MyService.java Code

package com.example.clock;
import android.app.Service;
import android.content.Intent;
import android.os.Binder;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.util.Log;
import android.widget.EditText;
public class MyService extends Service {
   
   
    public MyService() {
   
   
    }
    @Override
    public IBinder onBind(Intent intent) {
   
   
        return new MyBinder(); // Methods that must be implemented , For binding between activities and services 
    }
    public class MyBinder extends Binder {
   
   
        MyHandler handler;
        public MyService getMyService() {
   
   
            return MyService.this;
        }
        public MyHandler getHandler() {
   
   
            handler=new MyHandler();// Initialize a message object 
            return handler; // Return the message object 
        }
    }
    public class MyHandler extends Handler {
   
   
        public String[] nums;
        public String str;
        public String str1;
        public void handleMessage(Message msg) {
   
   
            str1= String.valueOf(msg.obj); // obtain MainActivity The message in 
            Log.d(" residue ", str1);
            new Thread(new Runnable() {
   
   
                @Override
                public void run() {
   
     // Start a thread 
                    nums=str1.split(":"); // Split the obtained string into an array 
                    // Convert the time in a string to seconds 
                    int time1=Integer.parseInt(nums[2])+60*60*Integer.parseInt(nums[1])+60*Integer.parseInt(nums[1]);
                    for(int time = time1;time>=0;time--){
   
    // adopt for A loop is a cycle of time 
                        if(time==0){
   
     // If the countdown to 0, Is displayed （ Time out ） word 
                            MainActivity.textView.setText(" Time out !");
                        }
                        try {
   
    // take time Seconds are converted back to time strings 
                            int hour = 0;
                            int minutes = 0;
                            int sencond = 0;
                            int temp = time % 3600;
                            if (time > 3600) {
   
   
                                hour = time / 3600;
                                if (temp != 0) {
   
   
                                    if (temp > 60) {
   
   
                                        minutes = temp / 60;
                                        if (temp % 60 != 0) {
   
   
                                            sencond = temp % 60;
                                        }
                                    } else {
   
   
                                        sencond = temp;
                                    }
                                }
                            } else {
   
   
                                minutes = time / 60;
                                if (time % 60 != 0) {
   
   
                                    sencond = time % 60;
                                }
                            }
                            str=(hour<10?("0"+hour):hour) + ":" + (minutes<10?("0"+minutes):minutes)
                                    + ":" + (sencond<10?("0"+sencond):sencond);
                            MainActivity.num.setText(str); // update EditText Value 
                            Thread.sleep(1000); // Thread to sleep 1 second 
                        } catch (Exception e) {
   
   
                            e.printStackTrace();
                        }
                    }
                }
            }).start();
        }
    }

    @Override
    public void onDestroy() {
   
   
        super.onDestroy();
    }
}

• MainAcivity.java

package com.example.clock;

import androidx.appcompat.app.AppCompatActivity;

import android.content.ComponentName;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Binder;
import android.os.Bundle;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
   
   
    MyService.MyBinder myBinder;
    public static EditText num;
    int flag = 0;
    String str;
    Intent intent;
   public static TextView textView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
   
   
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        textView=findViewById(R.id.text1);
        final Button btnStart = (Button) findViewById(R.id.btnStart);
        num = (EditText) findViewById(R.id.num);
        btnStart.setOnClickListener(new View.OnClickListener() {
   
   
            @Override
            public void onClick(View v) {
   
   
                if (flag == 0) {
   
   
                    if (num.getText().length() < 1) {
   
    // If no value is entered , The default filling value is obtained （Hint）
                        str = String.valueOf(num.getHint());
                    }else {
   
   
                        str=num.getText().toString(); // Get the input value 
                    }
                    flag = 1; // Used to judge the status of the button 
                    btnStart.setText(" Pause ");
                    num.setEnabled(false); // take EditText Set to non editable 
                    intent = new Intent(MainActivity.this, MyService.class); // Create a start Service Of Intent object 
                    bindService(intent, conn, BIND_AUTO_CREATE); // Binding specifies Service
                    Log.d("time", String.valueOf(str));
                } else {
   
   
                    flag = 0;
                    btnStart.setText(" Start ");
                    myBinder.getMyService().onDestroy();
                }
            }
        });
    }
    ServiceConnection conn = new ServiceConnection() {
   
   
        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
   
   // Set up to communicate with the service 
            myBinder = (MyService.MyBinder) service; // Get the... In the service MyBinder object 
            Message message = new Message(); // Create message object 
            message.obj = str; // Pass parameters ,str Is the value obtained 
            MyService.MyHandler handler = myBinder.getHandler(); // obtain MyService Medium Handler object 
            handler.sendMessage(message); // adopt Handler Object to send a message 
        }

        @Override
        public void onServiceDisconnected(ComponentName name) {
   
   

        }
    };
}