以编程方式修改系统亮度
要以编程方式调整设备屏幕的亮度,您可以使用各种方法。一种常见的方法是处理屏幕亮度属性:
<code class="java">WindowManager.LayoutParams lp = window.getAttributes(); lp.screenBrightness = (float)brightness; window.setAttributes(lp);</code>
但是,由于潜在的限制或不正确的最大值设置,此技术可能并不总是有效。
另一种方法是利用系统设置和 ContentResolver:
<code class="java">private ContentResolver cResolver; private Window window; private int brightness; onCreate() { cResolver = getContentResolver(); window = getWindow(); try { // Handle auto brightness mode Settings.System.putInt(cResolver, Settings.System.SCREEN_BRIGHTNESS_MODE, Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL); // Retrieve current brightness brightness = Settings.System.getInt(cResolver, Settings.System.SCREEN_BRIGHTNESS); } catch (SettingNotFoundException e) { Log.e("Error", "Cannot access system brightness"); e.printStackTrace(); } }</code>
然后您可以调整亮度:
<code class="java">// Update system brightness Settings.System.putInt(cResolver, Settings.System.SCREEN_BRIGHTNESS, brightness); // Update window brightness attributes LayoutParams layoutpars = window.getAttributes(); layoutpars.screenBrightness = brightness / 255f; window.setAttributes(layoutpars);</code>
不要忘记在清单中包含必要的权限:
<code class="xml"><uses-permission android:name="android.permission.WRITE_SETTINGS" /></code>
对于 API 级别 23 及以上,您需要按照文档中的说明通过 Settings Activity 请求权限。
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