화면 밝기 변경 (Change screen brightness)

[Snippet]

 

화면 밝기 변경

밝기 값

0~255(최소~최대), -1(시스템 설정값)

private void changeScreenBrightness(int value) {
    Window window = getWindow();
    WindowManager.LayoutParams layoutParams = window.getAttributes();
    layoutParams.screenBrightness = value * 1.0f / 255;
    window.setAttributes(layoutParams);
}

 

[Sample]

버튼 3개(최소, 최대, 시스템 설정)로 해당 밝기 선택, 종료시는 시스템 설정 밝기로 복귀

public class MainActivity extends AppCompatActivity {
    private static final int BRIGHTNESS_MIN = 0;
    private static final int BRIGHTNESS_MAX = 255;
    private static final int BRIGHTNESS_SYSTEM = -1;

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

        findViewById(R.id.btnMinBrightness).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                changeScreenBrightness(BRIGHTNESS_MIN);
            }
        });

        findViewById(R.id.btnMaxBrightness).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                changeScreenBrightness(BRIGHTNESS_MAX);
            }
        });

        findViewById(R.id.btnSystemBrightness).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                changeScreenBrightness(BRIGHTNESS_SYSTEM);
            }
        });
    }

    @Override
    protected void onStop() {
        super.onStop();
        changeScreenBrightness(BRIGHTNESS_SYSTEM);
    }

    private void changeScreenBrightness(int value) {
        Window window = getWindow();
        WindowManager.LayoutParams layoutParams = window.getAttributes();
        layoutParams.screenBrightness = value * 1.0f / 255;
        window.setAttributes(layoutParams);
    }

ScreenBrightness.zip