本地Service的启动与销毁-绑定与解绑

main-xml

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

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="启动停止本地服务" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <Button
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:onClick="startLocalService"
            android:text="启动本地服务" />

        <Button
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:onClick="stopLocalService"
            android:text="停止本地服务" />
    </LinearLayout>

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="绑定解绑本地服务" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <Button
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:onClick="bindLocalService"
            android:text="绑定本地服务" />

        <Button
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:onClick="unbindLocalService"
            android:text="解绑本地服务" />
    </LinearLayout>
</LinearLayout>

创建L1ocalService.java继承Service 并重写内部方法

public class L1ocalService extends Service {
    public L1ocalService() {
        Log.i("godv", "本地服务1被创建");
    }

    @Override
    public void onCreate() {
        super.onCreate();
        Log.i("godv", "本地服务1启动");
    }
//启动服务再次启动调用
    @Override
    public void onStart(Intent intent, int startId) {
        super.onStart(intent, startId);
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        Log.i("godv", "onStartCommand");
        return super.onStartCommand(intent, flags, startId);
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        Log.i("godv", "本地服务1被销毁");
    }

    @Override
    public void onConfigurationChanged(Configuration newConfig) {
        super.onConfigurationChanged(newConfig);
    }

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

    @Override
    public void onTrimMemory(int level) {
        super.onTrimMemory(level);
    }

    @Override
    public boolean onUnbind(Intent intent) {
        Log.i("godv", "onUnbind");
        return super.onUnbind(intent);
    }

    @Override
    public void onRebind(Intent intent) {
        super.onRebind(intent);
    }

    @Override
    public void onTaskRemoved(Intent rootIntent) {
        super.onTaskRemoved(rootIntent);
    }

    @Override
    protected void dump(FileDescriptor fd, PrintWriter writer, String[] args) {
        super.dump(fd, writer, args);
    }

    @Override
    protected void attachBaseContext(Context newBase) {
        super.attachBaseContext(newBase);
    }
//这里绑定的时候需要返回一个Binder对象  即IBinder的实现类
    @Override
    public IBinder onBind(Intent intent) {
        Log.i("godv", "onBind");
        return new Binder();
    }
}

activity启动与销毁代码

public class MainActivity extends AppCompatActivity {

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

    public void startLocalService(View v) {
        Intent intent = new Intent(this, L1ocalService.class);
        startService(intent);
        Toast.makeText(this, "start service", Toast.LENGTH_SHORT).show();

    }

    public void stopLocalService(View v) {
        Intent intent = new Intent(this, L1ocalService.class);
        stopService(intent);
        Toast.makeText(this, "stop service", Toast.LENGTH_SHORT).show();
    }

    ServiceConnection serviceConnection;

    public void bindLocalService(View v) {
        Intent intent = new Intent(this, L1ocalService.class);
        if (serviceConnection == null) {
            serviceConnection = new ServiceConnection() {
                @Override
                public void onServiceConnected(ComponentName componentName, IBinder iBinder) {
                    Log.i("godv", "onServiceConnected");
                }

                @Override
                public void onServiceDisconnected(ComponentName componentName) {
                    Log.i("godv", "onServiceDisconnected");
                }
            };
            bindService(intent, serviceConnection, Context.BIND_AUTO_CREATE);
            Toast.makeText(this, "bind service", Toast.LENGTH_SHORT).show();
        } else {
            Toast.makeText(this, "already bind service", Toast.LENGTH_SHORT).show();
        }

    }

    public void unbindLocalService(View v) {
        if (serviceConnection != null) {
            unbindService(serviceConnection);
            serviceConnection = null;
            Toast.makeText(this, "unbind service", Toast.LENGTH_SHORT).show();
        } else {
            Toast.makeText(this, "already unbind service", Toast.LENGTH_SHORT).show();
        }
    }
//在activity消亡的时候需要解绑服务
//只有当所有与服务连接的对象解绑 才会销毁Service
    @Override
    protected void onDestroy() {
        super.onDestroy();
        if (serviceConnection != null) {
            unbindService(serviceConnection);
            serviceConnection = null;
        }
    }
}

AndroidManifest.xml中注册

<service android:name=".L1ocalService" />

具体位置

总结一下生命周期：

1. startService(intent)
    第一次调用 : -->构造方法()-->onCreate()-->onStartCommand()
    (重要)后面再调用 : -->onStartCommand()
    stopService() : -->onDestory()
2. bindService(intent, serviceConnection)
    调用 : -->构造方法()-->onCreate()-->onBind()-->onServiceConnected()
    unbindService(): (中有当前Activity与Service连接)-->onUnbind()-->onDestroy()