android——Service与Activity直接通讯(bindservice)留着使用的时候直接贴代码

Service端

public class LocalService extends Service {
    // Binder given to clients
    private final IBinder mBinder = new LocalBinder();
    // Random number generator
    private final Random mGenerator = new Random();

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

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return mBinder ;
    }

    class LocalBinder extends Binder {

        public LocalService getService(){
            return LocalService.this;
        }
    }

    /** method for clients */
    public int getRandomNumber() {
        return mGenerator.nextInt(100);
    }
}

Activity端直接获取Service提供的随机数

public class MainActivity extends AppCompatActivity {
    LocalService mService;
    private TextView tv;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        tv = (TextView) findViewById(R.id.tv);
        tv.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                tv.setText(""+mService.getRandomNumber());
            }
        });
    }

    @Override
    protected void onStart() {
        super.onStart();

        Intent intent = new Intent(this, LocalService.class);
        bindService(intent,conn, Context.BIND_AUTO_CREATE);
    }

    ServiceConnection conn = new ServiceConnection() {
        @Override
        public void onServiceConnected(ComponentName componentName, IBinder iBinder) {
            LocalService.LocalBinder binder = (LocalService.LocalBinder)iBinder;
            mService = binder.getService();
            Toast.makeText(mService, "成功", Toast.LENGTH_SHORT).show();

        }

        @Override
        public void onServiceDisconnected(ComponentName componentName) {
            Toast.makeText(mService, "失败", Toast.LENGTH_SHORT).show();
        }
    };

    @Override
    protected void onDestroy() {
        super.onDestroy();
        unbindService(conn);
    }
}