应用程序有一个图像按钮,用于打开和关闭屏幕亮度,但在打开和关闭一次后,该按钮不再工作。有没有人有想法,代码有什么问题?
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();
}
}
答案 0 :(得分:1)
当亮度关闭时,您永远不会将brightnessOnOff
设置为false,因此在您第一次按下按钮后它将具有值true
。因此,您的代码每次都会进入if
块。您需要做的是在关闭亮度时将brightnessOnOff
设置为false,并在再次打开亮度时将其设置为true。基本上,您需要在brightnessOnOff
和true
之间轮候false
才能使其正常工作