android - Android-并获得权限WRITE_SETTINGS ？!

Question

我在获得许可时遇到问题，我似乎无法理解为什么我没有获得更改屏幕亮度的许可。

我的清单如下所示：

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

在我的活动中，它看起来像这样：

public void changeScreenBrightness(float brightness) {
        mBrightness = brightness;

        if(Settings.System.canWrite(this)) {
            Intent perminssionIntent = new Intent(Settings.ACTION_MANAGE_WRITE_SETTINGS);
            startActivity(perminssionIntent);

        }else {
            Settings.System.putInt(mContentResolver, Settings.System.SCREEN_BRIGHTNESS, (int) (mBrightness*255));
        }

        WindowManager.LayoutParams mLayoutParams = mWindow.getAttributes();
        mLayoutParams.screenBrightness = mBrightness;
        mWindow.setAttributes(mLayoutParams);
    }

但是，该权限没有被授予？！谁能看到原因？

Answer 1

您尚未在!中包含if(Settings.System.canWrite(this))，则需要在canWrite(this)返回false时进入此分支。将您的功能更改为此，您的问题将得到解决。

public void changeScreenBrightness(float brightness) {
    mBrightness = brightness;

    if(!Settings.System.canWrite(this)) {
        Intent perminssionIntent = new Intent(Settings.ACTION_MANAGE_WRITE_SETTINGS);
        startActivity(perminssionIntent);

    } else {
        Settings.System.putInt(mContentResolver, Settings.System.SCREEN_BRIGHTNESS, (int) (mBrightness*255));
    }

    WindowManager.LayoutParams mLayoutParams = mWindow.getAttributes();
    mLayoutParams.screenBrightness = mBrightness;
    mWindow.setAttributes(mLayoutParams);
}