Camera预览拍照与人脸检测

30 June 2016

想法

最近在学习Android的Camera使用方法，通过对Camera的预览使用，谷歌的人脸检测使用，总结了一些经验。

操作

权限

<uses-permission android:name="android.permission.CAMERA" />
<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.camera.autofocus" />
<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

//初始化预览界面
    private void doOpenCamera() {
        mCamera = Camera.open(Camera.CameraInfo.CAMERA_FACING_FRONT);
        try {
            mCamera.setPreviewDisplay(mSurfaceHolder);
        }catch (IOException e){
            e.printStackTrace();
        }
        setCameraDisplayOrientation(this, Camera.CameraInfo.CAMERA_FACING_FRONT,mCamera);
        mCamera.startPreview();
    }

#错误解决

1.Custom view CustomView is not using the 2- or 3-argument View constructors; XML attributes will not work

You need to override the other 2 constructors of View in CustomView:

public CustomView(Context context) {
    super(context);
    init(context);
}

public CustomView(Context context, AttributeSet attrs) {
    super(context, attrs);
    init(context);
}

public CustomView(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
    init(context);
}

private void init(Context context) {
    //do stuff that was in your original constructor...
}

— Kong Jing