应用程序在中间有一个图像按钮，它打开“夜间模式”和一个用于控制屏幕亮度的搜索栏，但问题是图像按钮或搜索栏功能都没有，我也没有线索， 问题是什么。 下面是代码：
public class Nightmode extends AppCompatActivity {
private boolean nightmodeOnOff;
public ImageButton modeOnOffButton;
private int brightness;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Window window = getWindow();
window.addFlags(WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE);
setContentView(R.layout.activity_nightmode);
modeOnOffButton = (ImageButton) findViewById(R.id.nightmodeOnOffButton);
nightmodeOnOff = false;
int prog;
//Seekbar
SeekBar skbar = (SeekBar) findViewById(R.id.nightModeBar);
skbar.setMax(255);
skbar.setKeyProgressIncrement(127);
try {
brightness = Settings.System.getInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS);
} catch (Exception e) {
e.printStackTrace();
}
skbar.setProgress(brightness);
skbar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean b) {
if (progress <= 25) {
brightness = 25;
} else {
brightness = progress;
}
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
android.provider.Settings.System.putInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS, brightness);
WindowManager.LayoutParams lpp = getWindow().getAttributes();
lpp.screenBrightness = brightness/(float)255;
getWindow().setAttributes(lpp);
}
});
}
public void nightmodeButtonClicked(View view) {
try {
if (nightmodeOnOff) {
nightmodeOnOff = false;
turnNightOff();
} else {
nightmodeOnOff = true;
turnNightOn();
}
} catch (Exception e) {
e.printStackTrace();
}
}
private void turnNightOn() {
try {
modeOnOffButton.setImageResource(R.drawable.nightmodeonbutton);
findViewById(R.id.activity_nightmode).setBackgroundColor(0x66000000);
} catch (Exception e) {
e.printStackTrace();
}
}
private void turnNightOff() {
try {
modeOnOffButton.setImageResource(R.drawable.nightmodeonoffbutton);
findViewById(R.id.activity_nightmode).setBackgroundColor(33000000);
} catch (Exception e) {
e.printStackTrace();
}
}
@Override
protected void onResume() {
super.onResume();
turnNightOff();
}
@Override
protected void onStart() {
super.onStart();
}
@Override
protected void onStop() {
super.onStop();
turnNightOff();
}
@Override
protected void onDestroy() {
super.onDestroy();
turnNightOff();
}
@Override
protected void onPause() {
super.onPause();
turnNightOn();
}
}