抛出：SecurityException为WRITE_SETTINGS许可，同时调整屏幕亮度

App有按钮，在亮度之间切换的中间，但现在，如果按钮被点击了两次，我尝试点击它再不会再起作用。有没有人知道如何在第二次单击按钮之后单击按钮之前将屏幕亮度置于之前的状态。总的来说，点击按钮时，应用程序总是收到错误日志。如果有人能够解决这个问题，请提前致谢！以下是错误日志：抛出：SecurityException为WRITE_SETTINGS许可，同时调整屏幕亮度

W/System.err: java.lang.SecurityException: com.example.kenert.allinoneapp was not granted this permission: android.permission.WRITE_SETTINGS. 
W/System.err:  at android.os.Parcel.readException(Parcel.java:1684) 
W/System.err:  at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:183) 
W/System.err:  at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:135) 
W/System.err:  at android.content.ContentProviderProxy.call(ContentProviderNative.java:646) 
W/System.err:  at android.provider.Settings$NameValueCache.putStringForUser(Settings.java:1595) 
W/System.err:  at android.provider.Settings$System.putStringForUser(Settings.java:1966) 
W/System.err:  at android.provider.Settings$System.putIntForUser(Settings.java:2071) 
W/System.err:  at android.provider.Settings$System.putInt(Settings.java:2065) 
W/System.err:  at com.example.kenert.allinoneapp.ScreenFlashlight$override.turnBrightnessOff(ScreenFlashlight.java:60) 
W/System.err:  at com.example.kenert.allinoneapp.ScreenFlashlight$override.screenFlashButtonClicked(ScreenFlashlight.java:28) 
W/System.err:  at com.example.kenert.allinoneapp.ScreenFlashlight$override.access$dispatch(ScreenFlashlight.java) 
W/System.err:  at com.example.kenert.allinoneapp.ScreenFlashlight.screenFlashButtonClicked(ScreenFlashlight.java:0) 
W/System.err:  at java.lang.reflect.Method.invoke(Native Method) 
W/System.err:  at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288) 
W/System.err:  at android.view.View.performClick(View.java:5637) 
W/System.err:  at android.view.View$PerformClick.run(View.java:22429) 
W/System.err:  at android.os.Handler.handleCallback(Handler.java:751) 
W/System.err:  at android.os.Handler.dispatchMessage(Handler.java:95) 
W/System.err:  at android.os.Looper.loop(Looper.java:154) 
W/System.err:  at android.app.ActivityThread.main(ActivityThread.java:6119) 
W/System.err:  at java.lang.reflect.Method.invoke(Native Method) 
W/System.err:  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886) 
W/System.err:  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)

下面是类代码：

import android.content.Intent; 
import android.provider.Settings; 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.view.View; 
import android.view.WindowManager; 
import android.widget.ImageButton; 

public class ScreenFlashlight extends AppCompatActivity { 
private boolean brightnessOnOff; 
private ImageButton screenFlashOnOffButton; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_screen_flashlight); 
    screenFlashOnOffButton = (ImageButton) findViewById(R.id.screenFlashOnOffButton); 
    brightnessOnOff = false; 


} 
public void screenFlashButtonClicked(View view) { 
    try { 
     if (brightnessOnOff) { 

      turnBrightnessOff(); 
     } else{ 
       brightnessOnOff = true; 
      turnBrightnessOn(); 
     } 
    } catch (Exception e) { 
     e.printStackTrace(); 
    } 
} 



private void turnBrightnessOn() { 
    try { 
     screenFlashOnOffButton.setImageResource(R.drawable.screenonbutton); 
     Settings.System.putInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS_MODE, Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL); 
     Settings.System.putInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS_MODE, 255); 
     //Screen refresh to add brightness 
     int brightness = Settings.System.getInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS_MODE); 
     WindowManager.LayoutParams lp = getWindow().getAttributes(); 
     lp.screenBrightness = (float) brightness/255; 
     getWindow().setAttributes(lp); 


    } catch (Exception e) { 
     e.printStackTrace(); 
    } 
} 

private void turnBrightnessOff() { 
    try { 
     screenFlashOnOffButton.setImageResource(R.drawable.screenoffbutton); 
     Settings.System.putInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS_MODE, Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL); 
     Settings.System.putInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS_MODE, 100); 
     //Refresh screen 
     int brightnesss = Settings.System.getInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS_MODE); 
     WindowManager.LayoutParams lpp = getWindow().getAttributes(); 
     lpp.screenBrightness = (float) brightnesss/100; 
     getWindow().setAttributes(lpp); 
    } catch (Exception e) { 
     e.printStackTrace(); 
    } 
}

来源

2016-11-09 Kenertj

您的错误日志不完整，除了无法看到离子类型... –

此外，您在这里打破了良好的编程规则。 XXX的行为（在本例中为turnBrignessOff/On）应该与将其存储在设置中无关。这应该是一种不同的方法，或者甚至是类，它知道如何做到这一点。你的职能打破了“做一件事，做正确的”基本规则。（芹苴这是无关紧要的反正） –

添加了例外，根据的是，它是与写入设置，但我没把权限的Android清单。 – Kenertj

我用这个：

public void onClick(View arg0) { 
     int curBrightnessValue=android.provider.Settings.System.getInt(
     getContentResolver(),android.provider.Settings.System.SCREEN_BRIGHTNESS); 
     int SysBackLightValue = curBrightnessValue-25; 
     android.provider.Settings.System.putInt(getContentResolver(), 
     android.provider.Settings.System.SCREEN_BRIGHTNESS, 
     SysBackLightValue); 
}

不要忘记权限：

<uses-permission android:name="android.permission.WRITE_SETTINGS"/>

来源

2016-11-10 00:21:26 josedlujan

抛出：SecurityException为WRITE_SETTINGS许可，同时调整屏幕亮度

回答

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