Android安卓进程保活(二)：双进程拉活

当一个进程结束后，立刻调用启动另一个进程，这样实现互相调用，互相启动( 只有在一个进程结束时候才会启动另一个进程)

1.首先创建LocalService.java继承自Service(android.app.Service):

public class LocalService extends Service {
    @Override
    public IBinder onBind(Intent intent) {
        return new LocalBinder();
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        /*第一个参数Intent
        第二个参数ServiceConnection*/

        /**
         *  第三个参数介绍：
        * Flag for {@link #bindService}: automatically create the service as long
        * as the binding exists.  Note that while this will create the service,
        * its {@link android.app.Service#onStartCommand}
        * method will still only be called due to an
        * explicit call to {@link #startService}.  Even without that, though,
        * this still provides you with access to the service object while the
        * service is created.
        *
        * <p>Note that prior to {@link android.os.Build.VERSION_CODES#ICE_CREAM_SANDWICH},
        * not supplying this flag would also impact how important the system
        * consider's the target service's process to be.  When set, the only way
        * for it to be raised was by binding from a service in which case it will
        * only be important when that activity is in the foreground.  Now to
        * achieve this behavior you must explicitly supply the new flag
        * {@link #BIND_ADJUST_WITH_ACTIVITY}.  For compatibility, old applications
        * that don't specify {@link #BIND_AUTO_CREATE} will automatically have
        * the flags {@link #BIND_WAIVE_PRIORITY} and
        * {@link #BIND_ADJUST_WITH_ACTIVITY} set for them in order to achieve
        * the same result.
        */
        bindService(new Intent(this,RemoteService.class),connection,Context.BIND_AUTO_CREATE);
        return super.onStartCommand(intent, flags, startId);
    }

    private ServiceConnection connection = new ServiceConnection() {
        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            //绑定成功
        }

        @Override
        public void onServiceDisconnected(ComponentName name) {
            //当RemoteService所处进程被干掉就重新启动
            startService(new Intent(LocalService.this,RemoteService.class));
            bindService(new Intent(LocalService.this,RemoteService.class),connection,Context.BIND_IMPORTANT);
        }
    };

    private class LocalBinder extends Binder {

    }
}

对LocalService在清单文件中进行注册

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

2.创建RemoteService.java继承自Service(android.app.Service):↓

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

    @Override
    public IBinder onBind(Intent intent) {
        return new RemoteBinder();
    }

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

        /*第一个参数Intent
        第二个参数ServiceConnection
        第三个参数介绍：

        /**
        * Flag for {@link #bindService}: automatically create the service as long
        * as the binding exists.  Note that while this will create the service,
        * its {@link android.app.Service#onStartCommand}
        * method will still only be called due to an
        * explicit call to {@link #startService}.  Even without that, though,
        * this still provides you with access to the service object while the
        * service is created.
        *
        * <p>Note that prior to {@link android.os.Build.VERSION_CODES#ICE_CREAM_SANDWICH},
        * not supplying this flag would also impact how important the system
        * consider's the target service's process to be.  When set, the only way
        * for it to be raised was by binding from a service in which case it will
        * only be important when that activity is in the foreground.  Now to
        * achieve this behavior you must explicitly supply the new flag
        * {@link #BIND_ADJUST_WITH_ACTIVITY}.  For compatibility, old applications
        * that don't specify {@link #BIND_AUTO_CREATE} will automatically have
        * the flags {@link #BIND_WAIVE_PRIORITY} and
        * {@link #BIND_ADJUST_WITH_ACTIVITY} set for them in order to achieve
        * the same result.
        */
        bindService(new Intent(this,RemoteService.class),connection,Context.BIND_AUTO_CREATE);
        return super.onStartCommand(intent, flags, startId);
    }

    private ServiceConnection connection = new ServiceConnection() {
        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            //绑定成功
        }

        @Override
        public void onServiceDisconnected(ComponentName name) {
            //当RemoteService所处进程被干掉就重新启动
            startService(new Intent(RemoteService.this,LocalService.class));
            bindService(new Intent(RemoteService.this,LocalService.class),connection,Context.BIND_IMPORTANT);
        }
    };

    private class RemoteBinder extends Binder{
    
    }
}

对RemoteService 在清单文件中进行注册，再制定一个进程名字，好区分

<service
            android:name=".RemoteService"
            android:enabled="true"
            android:exported="true"
            android:process=":remote" />
        <!--
            android:process=":remote"
            指定进程名
        -->

最后在MainActivity启动其中一个服务LocalService:

public class MainActivity extends AppCompatActivity {

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

        //双进程拉活(Java层)
        startService(new Intent(this,LocalService.class));
    }
}

这样就完成了双进程拉活

原文地址：https://blog.csdn.net/qq_39431405/article/details/144426593

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