Android 11.0 开机时自动检测摄像头，有则显示，无则隐藏Camera APK图标

frameworks/base/services/core/java/com/android/server/am/UserController.java

检查是否有摄像头决定是否隐藏摄像头图标

    private void finishUserUnlockedCompleted(UserState uss) {
    
    
++        int n = android.hardware.Camera.getNumberOfCameras();
++        if (n==0){
    
    
++            setCamera(false);
++        }else if(n>0){
    
    
++            setCamera(true);
++        }
}

设置是否显示摄像头图标（由有无摄像头决定）

++    public void setCamera(boolean state){
    
    
++        PackageManager p = mInjector.getContext().getPackageManager();
++        if(state){
    
    
++            p.setApplicationEnabledSetting("com.android.camera2", PackageManager.COMPONENT_ENABLED_STATE_ENABLED, PackageManager.DONT_KILL_APP);
++        }else{
    
    
++            p.setApplicationEnabledSetting("com.android.camera2", PackageManager.COMPONENT_ENABLED_STATE_DISABLED, ++PackageManager.DONT_KILL_APP);
++        }
++    }

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