通过 Settings.System.putInt() 设置亮度不起作用

Question

我正在尝试更改手机上的亮度模式和值，并发现 这里有很棒的帖子，我认为它回答了我的问题，但在我的 froyo Dell Streak 上，这段代码根本不执行任何操作。 putInt() 返回 true，所以从所有帐户看来它似乎是成功的，但亮度仍然完全相同，甚至无法让它在手动和自动之间切换......我有 WRITE_SETTINGS 权限集，并且 logcat似乎没有任何其他相关的输出出来......现在被难住了，要休息一会儿 o_0

这是我如何调用它的片段，这是在我的（唯一的）Activity 中：

public void onCheckedChanged(RadioGroup group, int checked) {
    //BrightSettings bright = new BrightSettings();

    switch(checked)
    {
        case R.id.daybutton:
            //bright.setBrightMode(BrightSettings.DAY_MODE);
            if(Settings.System.putInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS_MODE, Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC))
                Log.d("NightMode", "Brightness seems to be set to auto....");
        case R.id.nightbutton:
            //bright.setBrightMode(BrightSettings.NIGHT_MODE);
            if (Settings.System.putInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS_MODE, Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL) && Settings.System.putInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS, 2) )
                Log.d("NightMode", "Night mode seems to have been set....");
    }
}

Answer 1

这是 kotlin 为我工作的。

<使用权限
    android:name="android.permission.WRITE_SETTINGS"
    工具：ignore =“ProtectedPermissions”/>

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_test)
    if(isCanWriteSettings(this))
        setupLight(this,255)//0~255
    else
        requestCanWriteSettings(this)
}
/**
 *
 * @param context
 * @param light max 255
 */
fun setupLight(context: Context, light: Int) {
    try {
        val brightnessMode = Settings.System.getInt(
            context.contentResolver,
            Settings.System.SCREEN_BRIGHTNESS_MODE
        )
        if (brightnessMode == Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC) {
            Settings.System.putInt(
                context.contentResolver,
                Settings.System.SCREEN_BRIGHTNESS_MODE,
                Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL
            )
        }
        Settings.System.putInt(
            context.contentResolver,
            Settings.System.SCREEN_BRIGHTNESS,
            light
        )
    } catch (e: Exception) {
        Log.e("setupLight","Exception $e")
    }
}

fun isCanWriteSettings(context: Context): Boolean {
    return Build.VERSION.SDK_INT < Build.VERSION_CODES.M || Settings.System.canWrite(context)
}


fun requestCanWriteSettings(activity: Activity){
    if (isCanWriteSettings(context = activity))
        return //not need
    try {
        val intent = Intent(Settings.ACTION_MANAGE_WRITE_SETTINGS)
        intent.data = Uri.parse("package:" + activity.packageName)
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
        activity.startActivityForResult(intent, 0)
    }catch (e: Exception){
        Log.e("requestCanWriteSettings","requestCanWriteSettings $e")
    }
}

Answer 2

这对我有用：

int brightnessMode = android.provider.Settings.System.getInt(getContentResolver(), android.provider.Settings.System.SCREEN_BRIGHTNESS_MODE);

if (brightnessMode == android.provider.Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC)
{
    android.provider.Settings.System.putInt(getContentResolver(),android.provider.Settings.System.SCREEN_BRIGHTNESS_MODE,android.provider.Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL);
}

Settings.System.putInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS, 0);

Answer 3

完整的答案是：

 /**
     * Set Device Brightness
     *
     * @param brightness Range (0-255)
     */
    @Override
    public void setDeviceBrightness(int brightness) {

        if (!Settings.System.canWrite(this.context)) {
            Intent intent = new Intent(Settings.ACTION_MANAGE_WRITE_SETTINGS);
            intent.setData(Uri.parse("package:" + this.context.getPackageName()));
            this.context.startActivity(intent);
            return;
        }

        try {
            if (Settings.System.getInt(
                     this.context.contentResolver,
                    Settings.System.SCREEN_BRIGHTNESS_MODE) == Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC) {
                Settings.System.putInt(
                          this.context.contentResolver,
                        Settings.System.SCREEN_BRIGHTNESS_MODE,
                        Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL);
            }
        } catch (Settings.SettingNotFoundException e) {
            e.printStackTrace();
        }

        if(Settings.System.putInt(this.context.contentResolver, SCREEN_BRIGHTNESS, brightness )) {
            Log.i("Updated System brightness to: " + brightness );
        }else {
            Log.w("ERROR: Failed to Updated System brightness to: " + brightness );
        }
    }

Answer 4

我还有一台运行 Froyo 的 Dell Streak。

屏幕亮度设置实际上对我来说确实发生了变化（如果您转到“设置”，您会看到滑块发生变化）。

然而，直到一段时间后，屏幕亮度实际上才会发生物理变化。这是我想不通的。

Answer 5

您的代码将更改亮度设置（存储的值），但这并不意味着它会更改当前亮度。

如果您在服务中运行该代码，则无法更改当前亮度（除了奇怪的黑客之外）。如果代码在 UI 中运行，您可以更改亮度设置，然后更改当前亮度 使用窗口管理器。