1

应用程序中间有按钮 在亮度之间切换，但是现在，如果单击按钮两次，然后我再次尝试单击它，它就不再起作用了。有谁知道如何在第二次单击按钮后将屏幕亮度置于单击按钮之前的先前状态。总体而言，单击按钮时应用程序会不断收到错误日志。如果有人能解决这个问题，请提前感谢！这是错误日志：

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)

这是该类的代码：

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();
    }
}
4

1 回答 1

0

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);
}

不要忘记许可：

<uses-permission android:name="android.permission.WRITE_SETTINGS"/>
于 2016-11-10T00:21:26.800 回答