android 监听亮度变化,Android系统。亮度变化
时间: 2023-10-18 22:05:46 浏览: 118
可以通过注册监听系统亮度变化的广播来实现。具体步骤如下:
1. 在AndroidManifest.xml文件中添加以下权限:
```
<uses-permission android:name="android.permission.WRITE_SETTINGS" />
<uses-permission android:name="android.permission.WRITE_SECURE_SETTINGS" />
```
2. 在需要监听亮度变化的Activity中,创建一个BroadcastReceiver:
```java
private BroadcastReceiver mBrightnessReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
if (intent.getAction().equals(Intent.ACTION_SCREEN_BRIGHTNESS_CHANGED)) {
// 获取当前亮度值
int brightness = Settings.System.getInt(getContentResolver(),
Settings.System.SCREEN_BRIGHTNESS, 0);
// 处理亮度变化事件
handleBrightnessChanged(brightness);
}
}
};
```
3. 在Activity的onCreate()方法中注册广播:
```java
IntentFilter filter = new IntentFilter();
filter.addAction(Intent.ACTION_SCREEN_BRIGHTNESS_CHANGED);
registerReceiver(mBrightnessReceiver, filter);
```
4. 在Activity的onDestroy()方法中取消广播注册:
```java
unregisterReceiver(mBrightnessReceiver);
```
这样就可以监听到系统亮度变化的事件了。注意,由于Android 6.0及以上版本的限制,需要动态请求WRITE_SETTINGS权限。