Android系统开发-判断相机是否在使用

AppOpsManager接口startWatchingActive(int[], OnOpActiveChangedListener) 监听相机是否被使用

• 必须是系统应用
• 有 <uses-permission android:name="android.permission.WATCH_APPOPS"/> 权限
• API>=30
  反射调用startWatchingActive(int[], OnOpActiveChangedListener)：

private void monitorCamera() {
    AppOpsManager mAppOps = (AppOpsManager) getSystemService(APP_OPS_SERVICE);
    try {
        Class appOpsManagerCls = Class.forName(AppOpsManager.class.getName());
        Field OP_CAMERA = appOpsManagerCls.getField("OP_CAMERA");
        DebugLog.d("OP_CAMERA " + OP_CAMERA.get(mAppOps));
        Method method = appOpsManagerCls.getMethod("startWatchingActive", int[].class, AppOpsManager.OnOpActiveChangedListener.class);
        method.setAccessible(true);
        method.invoke(mAppOps, new int[]{(int) OP_CAMERA.get(mAppOps)}, opActiveChangedListener);
    } catch (Exception e) {
        DebugLog.e("error " + e.getMessage());
    }
    //不用时，注销监听
    //mAppOps.stopWatchingActive(opActiveChangedListener);
}
//监听相机使用
AppOpsManager.OnOpActiveChangedListener opActiveChangedListener = new AppOpsManager.OnOpActiveChangedListener() {
    @Override
    public void onOpActiveChanged(@NonNull String op, int uid, @NonNull String packageName, boolean active) {
        DebugLog.d("packageName " + packageName + " active " + active);
    }
};