Android Service 启动方式，生命周期和应用场景详解

/**
 * Created by Finn on 2019-10-10.
 */
public class bindserviceA extends service{
    //client 可以通过Binder获取service实例
    public class MyBinder extends Binder {
        public bindservice getservice() {
            return bindserviceA .this;
        }
    }
 
    //通过binder实现调用者client与service之间的通信 在onBind中返回该对象
    private MyBinder binder = new MyBinder();
 
    private final Random generator = new Random();
 
    @Override
    public void onCreate() {
        Log.i("Finn","bindserviceA - onCreate - Thread = " + Thread.currentThread().getName());
        super.onCreate();
    }
 
    @Override
    public int onStartCommand(Intent intent,int flags,int startId) {
        Log.i("Finn","bindserviceA - onStartCommand - startId = " + startId + ",Thread = " + Thread.currentThread().getName());
        return START_NOT_STICKY;
    }
 
    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        Log.i("Finn","bindserviceA - onBind - Thread = " + Thread.currentThread().getName());
        return binder;
    }
 
    @Override
    public Boolean onUnbind(Intent intent) {
        Log.i("Finn","bindservice - onUnbind - from = " + intent.getStringExtra("from"));
        return false;
    }
 
    @Override
    public void onDestroy() {
        Log.i("Finn","bindserviceA - onDestroy - Thread = " + Thread.currentThread().getName());
        super.onDestroy();
    }
 
    //getRandomnumber是service暴露出去供client调用的公共方法
    public int getRandomnumber() {
        return generator.nexTint();
    }@H_262_363@ 
 

public class ActivityA extends Activity {
    private bindserviceA service = null;
    private Boolean isBind = false;
 
    private serviceConnection conn = new serviceConnection() {
        @Override
        public void onserviceConnected(ComponentName name,IBinder binder) {
            isBind = true;
            bindservice .MyBinder myBinder = (bindserviceA.MyBinder) binder;
            service = myBinder.getservice();//通过serviceConnection 中的IBinder获取 绑定的service对象
            Log.i("Finn","ActivityA - onserviceConnected");
            int num = service.getRandomnumber();//通过service对象可对  bindserviceA中的函数进行操作
            Log.i("Kathy","ActivityA - getRandomnumber = " + num);
        }
 
        @Override
        public void onserviceDisconnected(ComponentName Name) {
            isBind = false;
            Log.i("Finn","ActivityA - onserviceDisconnected");
        }
    };
 
    protected void onCreate(Bundle savedInstanceStatE) {
       super.onCreate(savedInstanceStatE);
       setContentView(R.layout.activity_a);
       Log.i("Finn","ActivityA - onCreate - Thread = " + Thread.currentThread().getName());
 　　　 bindservice();
  　　　unbindservice();


    }

　　 private void bindservice(){
 　　　　　　 Intent intent = new Intent(this,bindserviceA.class);
            intent.putExtra("from","ActivityA");      
            Log.i("Finn","ActivityA 执行 bindserviceA");
            bindservice(intent,conn,BIND_AUTO_create);//通过该方法绑定服务（周期：onCreate（）------》onbind（））

　　 }
    private void unbindservice(){
    //单击了“unbindservice”按钮
            if (isBind) {
                Log.i("Finn","ActivityA 执行 unbindservice");
                unbindservice(conn);//通过该方法解除绑定服务  周期：----先执行  onunbind（）---》onDestroy（）@H_262_363@ 
  

            }
 　　 }
 
    @Override
    protected void onDestroy() {
        super.onDestroy();
        Log.i("Finn","ActivityA - onDestroy");
    }
}@H_262_363@