Android Studio的代码笔记--Service学习

Service简答的服务(开启、关闭)

MyService

New-service-service命名为MyService

添加如下代码

	@Override
    public void onCreate() {//创建
        super.onCreate();
        Log.i("LXH","onCreate");
    }
    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {//开启
        Log.i("LXH","onStartCommand");
        return super.onStartCommand(intent, flags, startId);
    }
    @Override
    public void onDestroy() {//销毁
        super.onDestroy();
        Log.i("LXH","onDestroy");
    }

main.xml

	<TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="服务" />
    <Button
        android:id="@+id/btnStartService"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="启动服务" />
    <Button
        android:id="@+id/btnStopService"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="停止服务" />

MainActivity

public class MainActivity extends AppCompatActivity {
    Button btnStartService;
    Button btnStopService;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        btnStartService=findViewById(R.id.btnStartService);
        btnStopService=findViewById(R.id.btnStopService);
        btnStartService.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                //通过 intent 启动 service
                startService(new Intent(MainActivity.this, MyService.class));
            }
        });
        btnStopService.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                //关闭
                stopService(new Intent(MainActivity.this, MyService.class));
            }
        });
    }
}

运行

点击启动服务：onCreate->onStartCommand
点击关闭服务：onDestroy

复杂一点的服务（开启、关闭、绑定、解除）

raw/yue.mp3

new-Directory 命名raw，放入音乐文件yue.mp3

MusicService

public class MusicService extends Service {
    public MusicService() {
    }
    private MediaPlayer mPlayer;
    public  final IBinder mBinder=new LocalBinder();
    public class LocalBinder extends Binder {// 在Binder中定义一个自定义的接口用于数据交互
    }
    @Override
    public void onCreate() {
        Log.i("LXH", "MusicService_onCreate");
        mPlayer = MediaPlayer.create(getApplicationContext(), R.raw.yue);
        mPlayer.setLooping(true);//重复播放
        super.onCreate();
    }
    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        Log.i("LXH", "MusicService_onStartCommand()");
        mPlayer.start();
        return super.onStartCommand(intent, flags, startId);
    }
    @Override
    public void onDestroy() {
        Log.i("LXH", "MusicService_onDestroy()");
        mPlayer.stop();
        super.onDestroy();
    }
    @Override
    public boolean onUnbind(Intent intent) {
        Log.i("LXH", "MusicService_onUnbind()");
        mPlayer.stop();
        return super.onUnbind(intent);
    }
    @Override
    public IBinder onBind(Intent intent) {
        // TODO: Return the communication channel to the service.
        Log.i("LXH", "MusicService_onBind()");
        mPlayer.start();
        return mBinder;//绑定服务，把当前服务的IBinder对象的引用传递给宿主
//        throw new UnsupportedOperationException("Not yet implemented");
    }
}

main.xml

	<TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="音乐播放服务"/>
    <Button
        android:id="@+id/startMusic"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="开启音乐播放服务"/>
    <Button
        android:id="@+id/stopMusic"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="停止音乐播放服务"/>
    <Button
        android:id="@+id/bindMusic"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="绑定音乐播放服务"/>
    <Button
        android:id="@+id/unbindMusic"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="解除绑定音乐播放服务"/>

MainActivity

public class MainActivity extends AppCompatActivity {
    Button startMusic;
    Button stopMusic;
    Button bindMusic;
    Button unbindMusic;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        stopMusic=findViewById(R.id.stopMusic);
        startMusic=findViewById(R.id.startMusic);
        bindMusic=findViewById(R.id.bindMusic);
        unbindMusic=findViewById(R.id.unbindMusic);
        startMusic.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Log.i("LXH", "startMusic_onClick");
                startService(new Intent(MainActivity.this, MusicService.class));
            }
        });
        stopMusic.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Log.i("LXH", "stopMusic_onClick");
                stopService(new Intent(MainActivity.this, MusicService.class));
            }
        });
        bindMusic.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Log.i("LXH", "bindMusic_onClick");
                //绑定服务//connection=null表示不进行数据传递，BIND_AUTO_CREATE启动bindSerive    conn为服务链接对象
                bindService(new Intent(MainActivity.this, MusicService.class), conn, Context.BIND_AUTO_CREATE);
            }
        });
        unbindMusic.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Log.i("LXH", "unbindMusic_onClick");
                unbindService(conn); //解除绑定
            }
        });
    }
    ServiceConnection conn = new ServiceConnection() {// 定义服务链接对象
        @Override
        public void onServiceDisconnected(ComponentName name) {
//            Toast.makeText(ServiceTestActivity.this,"onSeviceDisconnected",Toast.LENGTH_SHORT).show();
            Log.e("service", "MusicServiceActivity onSeviceDisconnected");
        }
        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
//            Toast.makeText(ServiceTestActivity.this,"onServiceConnected", Toast.LENGTH_SHORT).show();
            Log.e("service", "MusicServiceActivity onServiceConnected");
        }
    };
}

运行

运行结果及代码

有需要项目链接: Service .也可以私信邮箱我看到就发
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