2

在我的应用程序中，我想更改SCREEN_BRIGHTNESS_MODE（并设置另一个值）。我在 AndroidManifest.xml 中添加了权限（与文件中的其他参数仔细检查）。当按下按钮时，模式的值应该改变。

@Override
public void onClick(View v) {
    if(on) {
        ContentResolver cResolver = getContentResolver();
        Settings.System.putInt(cResolver, Settings.System.SCREEN_BRIGHTNESS_MODE, Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL);
        Settings.System.putInt(cResolver, Settings.System.SCREEN_BRIGHTNESS, 50);
    }
}

和 AndroidManifest.xml： 

    <uses-permission android:name="android.permission.WRITE_SETTINGS"/>
    <activity
        android:name=".FullscreenActivity"
        android:configChanges="orientation|keyboardHidden|screenSize"
        android:label="@string/app_name"
        android:screenOrientation="landscape"
        android:theme="@style/FullscreenTheme">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.HOME" />
            <category android:name="android.intent.category.DEFAULT" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>

Android 设备是 Logic Instrument Fieldbook F1 Android-Version 5.0.1

当我尝试执行此命令时，出现以下异常：

08-31 15:29:28.471 16613-16613/com.matodayu.oxo E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.matodayu.oxo, PID: 16613 java.lang.SecurityException: Permission denial: writing to settings requires android.permission.WRITE_SETTINGS
        at android.os.Parcel.readException(Parcel.java:1540)
        at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:190)
        at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:142)
        at android.content.ContentProviderProxy.call(ContentProviderNative.java:643)
        at android.provider.Settings$NameValueCache.putStringForUser(Settings.java:1094)
        at android.provider.Settings$System.putStringForUser(Settings.java:1371)
        at android.provider.Settings$System.putIntForUser(Settings.java:1476)
        at android.provider.Settings$System.putInt(Settings.java:1470)
        at com.matodayu.oxo.FullscreenActivity$4$1.run(FullscreenActivity.java:184)
        at android.app.Activity.runOnUiThread(Activity.java:5285)
        at com.matodayu.oxo.FullscreenActivity$4.onClick(FullscreenActivity.java:179)
        at android.view.View.performClick(View.java:4809)
        at android.view.View$PerformClick.run(View.java:20123)
        at android.os.Handler.handleCallback(Handler.java:815)
        at android.os.Handler.dispatchMessage(Handler.java:104)
        at android.os.Looper.loop(Looper.java:194)
        at android.app.ActivityThread.main(ActivityThread.java:5534)
        at java.lang.reflect.Method.invoke(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:372)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:955)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:750)

谁能帮我？

4

1 回答 1

1

你在哪里定义你的权限？在清单或应用程序标签内？

我做了一个测试项目，它可以工作。当我在错误的位置添加权限时它失败了 - 例如应用程序标签。

于 2016-09-01T14:21:30.093 回答