Android/handler

handlerの基本的な使い方(UIスレッドで実行)

Handler handler = new Handler();
handler.post(new Runnable() {
    @Override
    public void run() {
        Log.i("test", "run()");
    }
});

5秒ごとに定期的に実行する方法

public class MainActivity extends AppCompatActivity {
    Handler mHandler = new Handler();
    private Runnable mHandlerTask = new Runnable() {
        @Override
        public void run() {
            Log.i("test", "run()");
            // 5秒後に実行
            mHandler.postDelayed(mHandlerTask, 5000L);
        }
    };
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        // 初回呼び出し
        mHandler.post(mHandlerTask);
    }
}

handlerをUIスレッドでなくワーカースレッドで実行

HandlerThread handlerThread = new HandlerThread("custom_name1");
handlerThread.start();
Handler handler = new Handler(handlerThread.getLooper());
handler.post(new Runnable() {
    @Override
    public void run() {
        Log.i("test", "run()");
    }
});