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在我的 Android 应用程序中，我使用以下代码来更改屏幕亮度

WindowManager.LayoutParams lp = getWindow().getAttributes();
lp.screenBrightness = someValue;
getWindow().setAttributes(lp);

在 Android 设备上它工作正常，但是当我将它移植到 BlackBerry-10 时它不起作用。我应该使用其他方法或解决方法吗？

Torcellite 的解决方案（由 Anton Cherkashyn 提供）：

我试过这个，经过进一步测试，它确实改变了 Android 设备上的亮度，但在 BlackBerry 上没有。它在 BlakcBerry 上变暗的唯一原因是因为打开了新活动（活动变化变暗）。

在我的活动中：

Intent intent = new Intent(getBaseContext(), DummyBrightnessActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.putExtra("brightness value", value[screenBrightness]); 
getApplication().startActivity(intent);

假：

public class DummyBrightnessActivity extends Activity{

    private static final int DELAYED_MESSAGE = 1;

    private Handler handler;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);            
        handler = new Handler() {
            @Override
            public void handleMessage(Message msg) {
                if(msg.what == DELAYED_MESSAGE) {
                    DummyBrightnessActivity.this.finish();
                }
                super.handleMessage(msg);
            }
        };
        Intent brightnessIntent = this.getIntent();
        float brightness = brightnessIntent.getFloatExtra("brightness value", 0);
        WindowManager.LayoutParams lp = getWindow().getAttributes();
        lp.screenBrightness = brightness;
        getWindow().setAttributes(lp);

        Message message = handler.obtainMessage(DELAYED_MESSAGE);
        //this next line is very important, you need to finish your activity with slight delay
        handler.sendMessageDelayed(message,1000); 
    }
}

显现：

 <activity android:name=".DummyBrightnessActivity"
            android:taskAffinity=".Dummy"
            android:excludeFromRecents="true"
            android:theme="@style/EmptyActivity"></activity>

样式.xml

 <style name="EmptyActivity" parent="android:Theme.Dialog">
        <item name="android:windowIsTranslucent">true</item>
        <item name="android:windowAnimationStyle">@android:style/Animation.Toast</item>
        <item name="android:background">#00000000</item>
        <item name="android:windowBackground">@android:color/transparent</item>
        <item name="android:windowNoTitle">true</item>
        <item name="android:colorForeground">#000</item>
    </style>
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1 回答 1

0

While the code you're using only changes the brightness of the current screen, the code I'm going to post changes the system brightness.

android.provider.Settings.System.putInt(getBaseContext()
                    .getContentResolver(),
                    android.provider.Settings.System.SCREEN_BRIGHTNESS, bright);

Where bright is an integer value from 0-255.

This method will not update your screen's brightness though. So, you'll need to call an invisible activity and close it to update the screen brightness.

Here's more info.

[EDIT]

Try adding this to your manifest:

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

[EDIT]

Try adding this too : 

<uses-permission android:name="android.permission.CHANGE_CONFIGURATION" />
于 2013-01-20T13:25:18.470 回答