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應用程序具有一個可以打開和關閉屏幕亮度的圖像按鈕，但是一次開啓和關閉屏幕亮度後，按鈕不再工作。有沒有人有想法，代碼有什麼問題？打開和關閉一次後按鈕停止功能
import android.provider.Settings;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.WindowManager;
import android.widget.ImageButton;
public class ScreenFlashlight extends AppCompatActivity {
private static String tag;
private static final String TAG = tag ;
private boolean brightnessOnOff;
private ImageButton screenFlashOnOffButton;
public ScreenFlashlight() throws Settings.SettingNotFoundException {
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_screen_flashlight);
screenFlashOnOffButton = (ImageButton) findViewById(R.id.flashOnOffButton);
brightnessOnOff = false;
}
public void screenFlashButtonClicked(View view) {
try {
if (brightnessOnOff) {
turnBrightnessOff();
Log.d(TAG, "screenFlashButtonClicked: ");
} else {
brightnessOnOff = true;
turnBrightnessOn();
Log.d(TAG, "screenFlashButtonClicked: ");
}
} catch (Exception e) {
e.printStackTrace();
}
}
private void turnBrightnessOn() {
try {
screenFlashOnOffButton.setImageResource(R.drawable.screenonbutton);
int currentBrightness = Settings.System.getInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS);
//Screen refresh to add brightness
WindowManager.LayoutParams lp = getWindow().getAttributes();
lp.screenBrightness = currentBrightness/ 100.0f;
getWindow().setAttributes(lp);
} catch (Exception e) {
e.printStackTrace();
}
}
private void turnBrightnessOff() {
try {
screenFlashOnOffButton.setImageResource(R.drawable.screenoffbutton);
int currentBrightness = Settings.System.getInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS);
//Refresh screen
WindowManager.LayoutParams lpp = getWindow().getAttributes();
lpp.screenBrightness = currentBrightness;
getWindow().setAttributes(lpp);
} catch (Exception e) {
e.printStackTrace();
}
}