03-Android基础知识---07-认识 Android Service

使用Service:

 

activity.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity"
    android:orientation="vertical">

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Hello World!"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/btnStartService"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="启动服务" />

    <Button
        android:id="@+id/btnStopService"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="停止服务" />

</LinearLayout>

Mainactivity.java:

package com.imooc.learnservice;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;

public class MainActivity extends AppCompatActivity {


//第二种方式：

    private Intent intent;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        intent = new Intent(MainActivity.this,MyService.class);


        findViewById(R.id.btnStartService).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startService(intent);
            }
        });

        findViewById(R.id.btnStopService).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startService(intent);
            }
        });

//第一种方式:
//        findViewById(R.id.btnStartService).setOnClickListener(new View.OnClickListener() {
//            @Override
//            public void onClick(View v) {
//                startService(new Intent(MainActivity.this,MyService.class));
//            }
//        });
//
//        findViewById(R.id.btnStopService).setOnClickListener(new View.OnClickListener() {
//            @Override
//            public void onClick(View v) {
//                startService(new Intent(MainActivity.this,MyService.class));
//            }
//        });
    }
}

MyService.java:

package com.imooc.learnservice;

import android.app.Service;
import android.content.Intent;
import android.os.IBinder;

public class MyService extends Service {
    public MyService() {
    }

    @Override
    public IBinder onBind(Intent intent) {
        // TODO: Return the communication channel to the service.
        throw new UnsupportedOperationException("Not yet implemented");
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {

        new Thread() {
            @Override
            public void run() {
                super.run();
                while (true) {
                    System.out.println("服务正在进行...");

                    try {
                        sleep(1000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }
        }.start();


        return super.onStartCommand(intent, flags, startId);
    }
}

AndroidManifes.xml:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.imooc.learnservice">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/Theme.LearnService">


        <service
            android:name=".MyService"
            android:enabled="true"
            android:exported="true"></service>

        <activity
            android:name=".MainActivity"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

---

 

绑定Service:

 

 activity_main.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity"
    android:orientation="vertical">

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Hello World!"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/btnStartService"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="启动服务" />

    <Button
        android:id="@+id/btnStopService"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="停止服务" />
    <Button
        android:id="@+id/btnBindService"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="绑定服务" />

    <Button
        android:id="@+id/btnUnBindService"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="解除绑定服务" />

</LinearLayout>

MainActivity.java:

package com.imooc.learnservice;

import androidx.appcompat.app.AppCompatActivity;

import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Bundle;
import android.os.IBinder;
import android.view.View;

public class MainActivity extends AppCompatActivity implements View.OnClickListener, ServiceConnection {


//第二种方式：

    private Intent intent;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        intent = new Intent(MainActivity.this,MyService.class);


        findViewById(R.id.btnStartService).setOnClickListener(this);

        findViewById(R.id.btnStopService).setOnClickListener(this);

        findViewById(R.id.btnBindService).setOnClickListener(this);

        findViewById(R.id.btnUnBindService).setOnClickListener(this);
        //要是有很多个按钮都需要运行这事件，那么可以用this来代替

//第一种方式:
//        findViewById(R.id.btnStartService).setOnClickListener(new View.OnClickListener() {
//            @Override
//            public void onClick(View v) {
//                startService(new Intent(MainActivity.this,MyService.class));
//            }
//        });
//
//        findViewById(R.id.btnStopService).setOnClickListener(new View.OnClickListener() {
//            @Override
//            public void onClick(View v) {
//                startService(new Intent(MainActivity.this,MyService.class));
//            }
//        });
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()){
            case R.id.btnStartService:
                startService(intent);
            case R.id.btnStopService:
                stopService(intent);
            case R.id.btnBindService:
                bindService(intent,this, Context.BIND_AUTO_CREATE);
            case R.id.btnUnBindService:
                unbindService(this);

                break;


        }
    }

    @Override
    public void onServiceConnected(ComponentName name, IBinder service) {
        System.out.println("Service Connected");
    }

    @Override
    public void onServiceDisconnected(ComponentName name) {

    }
}

MyService.java:

package com.imooc.learnservice;

import android.app.Service;
import android.content.Intent;
import android.os.Binder;
import android.os.IBinder;

public class MyService extends Service {
    public MyService() {
    }

    @Override
    public IBinder onBind(Intent intent) {
        // TODO: Return the communication channel to the service.
        return new Binder();
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {

        new Thread() {
            @Override
            public void run() {
                super.run();
                while (true) {
                    System.out.println("服务正在进行...");

                    try {
                        sleep(1000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }
        }.start();


        return super.onStartCommand(intent, flags, startId);
    }
}

---

Service生命周期：

package com.imooc.learnservice;

import android.app.Service;
import android.content.Intent;
import android.os.Binder;
import android.os.IBinder;

public class MyService extends Service {

    private boolean serviceRunning = false;

    public MyService() {
    }

    @Override
    public IBinder onBind(Intent intent) {
        // TODO: Return the communication channel to the service.
        return new Binder();
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {

//        new Thread() {
//            @Override
//            public void run() {
//                super.run();
//                while (serviceRunning) {
//                    System.out.println("服务正在进行...");
//
//                    try {
//                        sleep(1000);
//                    } catch (InterruptedException e) {
//                        e.printStackTrace();
//                    }
//                }
//            }
//        }.start();

        System.out.println("OnSatrtCommand");
        return super.onStartCommand(intent, flags, startId);

    }

    @Override
    public void onCreate() {
        super.onCreate();

        System.out.println("service cerate");

        new Thread() {
    @Override
        public void run() {
            super.run();
            while (serviceRunning) {
                System.out.println("服务正在进行...");

                try {
                    sleep(1000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }
                    }.start();

        serviceRunning = true;
    }

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

        System.out.println("service destory");

        serviceRunning = false;

    }
}