XjojoX1989

<activity android:name=".Project"
 android:launchMode="standard"||"singleTop"||"singleInstance"||"singleTask"/>
 

XjojoX1989

 <activity android:name=".activity"
            android:launchMode="singleTop"/>

XjojoX1989

 <activity android:name=".activity"
            android:launchMode="singleTask"/>

XjojoX1989

 <activity android:name=".activity"
            android:launchMode="singleInstance"/>

XjojoX1989

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

XjojoX1989

public class MyService : Service() {

    //啟動或bind這個service元件時，第一個呼叫的方法
    override fun onCreate() {
        Log.e("＊＊＊", "onCreate")
    }

    //啟動service元件時呼叫的方法
    override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
        Log.e("＊＊＊", "onStartCommand")

XjojoX1989

public class MainActivity extends AppCompatActivity {

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

        findViewById(R.id.btService).setOnClickListener(v -> {
            Intent intent = new Intent(MainActivity.this, MyService.class);
            intent.putExtra("test", "test service");

XjojoX1989

class MyService : Service(){

    override fun onBind(intent: Intent?): IBinder? {
        Log.e(TAG, "onBind")
        return MyBinder()
    }

    inner class MyBinder : Binder(){
    
    }

XjojoX1989

class MyIntentService : IntentService("MyIntentService") {
   
    override fun onHandleIntent(intent: Intent?) {
      //此時已在背景執行緒了，可以開始耗時操作
    }

    override fun onDestroy() {
        super.onDestroy()
    }
}

XjojoX1989

public class MainActivity : AppCompatActivity()  {
   
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        findViewById(R.id.btIntentService).setOnClickListener{
            //啟動IntentService
            startService(new Intent(MainActivity.this, MyIntentService.class)); 
        }
    }