Android 拍身份证（自定义相机）

Android自定义相机拍摄二代身份证。

感谢开源，尊重他人劳动成果，本自定义相机拍照核心逻辑取自云栖社区上Android 手把手带你玩转自定义相机
文章，本文仅仅在此基础上再次封装了返回拍照地址等监听事件，另外拍摄按钮没有做动画效果（待优化）

布局文件：

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"><ccqlk.homestay.bean.CameraSurfaceView
        android:id="@+id/cameraSurfaceView"android:layout_width="match_parent"android:layout_height="match_parent" /><ccqlk.homestay.bean.CameraTopRectView
        android:id="@+id/rectOnCamera"android:layout_width="match_parent"android:layout_height="match_parent" /><RelativeLayout
        android:layout_width="match_parent"android:layout_height="match_parent"><Button
            android:layout_alignParentBottom="true"android:layout_centerHorizontal="true"android:layout_marginBottom="60dp"android:id="@+id/takePic"android:layout_width="80dp"android:layout_height="50dp"android:background="@color/colorAccent"android:text="点击拍照"android:textColor="@color/white" /></RelativeLayout></FrameLayout>

activity文件：

public class MCamerActivity extends AppCompatActivity implements View.OnClickListener,RectOnCamera.IAutoFocus{private Button button;private CameraSurfaceView mCameraSurfaceView;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_camera);mCameraSurfaceView = (CameraSurfaceView) findViewById(R.id.cameraSurfaceView);button = (Button) findViewById(R.id.takePic);button.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {mCameraSurfaceView.takePicture();mCameraSurfaceView.setOnPathChangedListener(new CameraSurfaceView.OnPathChangedListener() {@Overridepublic void onValueChange(String path) {LogUtil.d("-----拍摄的照片路径："+path);}});}});}@Overrideprotected void onRestart() {super.onRestart();}@Overridepublic void onClick(View v) {switch (v.getId()){case R.id.takePic:mCameraSurfaceView.takePicture();break;default:break;}}@Overridepublic void autoFocus() {mCameraSurfaceView.setAutoFocus();}
}

CameraSurfaceView类：（其中LogUtil为我自己的日志工具，各位可以换成自己的或者Android自带的LOG）

package ccqlk.homestay.bean;import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.hardware.Camera;
import android.os.Environment;
import android.util.AttributeSet;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.WindowManager;
import android.widget.FrameLayout;
import android.widget.Toast;import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Date;
import java.util.List;import ccqlk.homestay.ryx.uitls.LogUtil;/*** Created by LK-RYX on 2018/4/28.*/public class CameraSurfaceView extends SurfaceView implements SurfaceHolder.Callback, Camera.AutoFocusCallback {private static final String TAG = "CameraSurfaceView";private Context mContext;private SurfaceHolder holder;private Camera mCamera;private int mScreenWidth;private int mScreenHeight;private CameraTopRectView topView;private File mFile;private OnPathChangedListener onPathChangedListener;public OnPathChangedListener getOnPathChangedListener() {return onPathChangedListener;}public void setOnPathChangedListener(OnPathChangedListener onPathChangedListener) {this.onPathChangedListener = onPathChangedListener;}public CameraSurfaceView(Context context) {this(context, null);}public CameraSurfaceView(Context context, AttributeSet attrs) {this(context, attrs, 0);}public CameraSurfaceView(Context context, AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);mContext = context;getScreenMetrix(context);topView = new CameraTopRectView(context, attrs);initView();}//拿到手机屏幕大小private void getScreenMetrix(Context context) {WindowManager WM = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);DisplayMetrics outMetrics = new DisplayMetrics();WM.getDefaultDisplay().getMetrics(outMetrics);mScreenWidth = outMetrics.widthPixels;mScreenHeight = outMetrics.heightPixels;}private void initView() {holder = getHolder();//获得surfaceHolder引用holder.addCallback(this);
//        holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);//设置类型}@Overridepublic void surfaceCreated(SurfaceHolder holder) {Log.i(TAG, "surfaceCreated");if (mCamera == null) {mCamera = Camera.open();try {mCamera.setPreviewDisplay(holder);//摄像头画面显示在Surface上} catch (IOException e) {e.printStackTrace();}}}@Overridepublic void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {LogUtil.d("------surfaceChanged");setCameraParams(mCamera, mScreenWidth, mScreenHeight);mCamera.startPreview();
//        mCamera.takePicture(null, null, jpeg);}@Overridepublic void surfaceDestroyed(SurfaceHolder holder) {LogUtil.d("------surfaceDestroyed");mCamera.stopPreview();//停止预览mCamera.release();//释放相机资源mCamera = null;holder = null;}@Overridepublic void onAutoFocus(boolean success, Camera Camera) {if (success) {LogUtil.d("------onAutoFocus success=" + success);System.out.println(success);}}private void setCameraParams(Camera camera, int width, int height) {//LogUtil.d("------setCameraParams  width="+width+"  height="+height);Camera.Parameters parameters = mCamera.getParameters();// 获取摄像头支持的PictureSize列表List<Camera.Size> pictureSizeList = parameters.getSupportedPictureSizes();/**从列表中选取合适的分辨率*/Camera.Size picSize = getProperSize(pictureSizeList, ((float) height / width));if (null == picSize) {Log.i(TAG, "null == picSize");picSize = parameters.getPictureSize();}// 根据选出的PictureSize重新设置SurfaceView大小float w = picSize.width;float h = picSize.height;parameters.setPictureSize(picSize.width, picSize.height);this.setLayoutParams(new FrameLayout.LayoutParams((int) (height * (h / w)), height));// 获取摄像头支持的PreviewSize列表List<Camera.Size> previewSizeList = parameters.getSupportedPreviewSizes();Camera.Size preSize = getProperSize(previewSizeList, ((float) height) / width);if (null != preSize) {LogUtil.d("----------preSize.width=" + preSize.width + " --- preSize.height=" + preSize.height);parameters.setPreviewSize(preSize.width, preSize.height);}parameters.setJpegQuality(100); // 设置照片质量if (parameters.getSupportedFocusModes().contains(android.hardware.Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE)) {parameters.setFocusMode(android.hardware.Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE);// 连续对焦模式}mCamera.cancelAutoFocus();//自动对焦。mCamera.setDisplayOrientation(90);// 设置PreviewDisplay的方向，效果就是将捕获的画面旋转多少度显示mCamera.setParameters(parameters);}/*** 从列表中选取合适的分辨率* 默认w:h = 4:3* <p>注意：这里的w对应屏幕的height* h对应屏幕的width<p/>*/private Camera.Size getProperSize(List<Camera.Size> pictureSizeList, float screenRatio) {Log.i(TAG, "screenRatio=" + screenRatio);Camera.Size result = null;for (Camera.Size size : pictureSizeList) {float currentRatio = ((float) size.width) / size.height;if (currentRatio - screenRatio == 0) {result = size;break;}}if (null == result) {for (Camera.Size size : pictureSizeList) {float curRatio = ((float) size.width) / size.height;if (curRatio == 4f / 3) {// 默认w:h = 4:3result = size;break;}}}return result;}// 拍照瞬间调用private Camera.ShutterCallback shutter = new Camera.ShutterCallback() {@Overridepublic void onShutter() {LogUtil.d("---------执行到这里了吗+1：shutter");}};// 获得没有压缩过的图片数据private Camera.PictureCallback raw = new Camera.PictureCallback() {@Overridepublic void onPictureTaken(byte[] data, Camera Camera) {LogUtil.d("---------执行到这里了吗+：raw");}};//创建jpeg图片回调数据对象private Camera.PictureCallback jpeg = new Camera.PictureCallback() {private Bitmap bitmap;@Overridepublic void onPictureTaken(byte[] data, Camera Camera) {topView.draw(new Canvas());BufferedOutputStream bos = null;Bitmap bm = null;if (data != null) {}try {// 获得图片bm = BitmapFactory.decodeByteArray(data, 0, data.length);if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {//                  图片存储前旋转Matrix m = new Matrix();int height = bm.getHeight();int width = bm.getWidth();m.setRotate(90);//旋转后的图片bitmap = Bitmap.createBitmap(bm, 0, 0, width, height, m, true);LogUtil.d("---------执行到这里了吗+3");String photo = "IMMQY/IMG_" + String.valueOf(new Date().getTime() + ".jpg");mFile = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM).getAbsolutePath(), photo);if (!mFile.getParentFile().exists()) mFile.getParentFile().mkdirs();LogUtil.d("---------自定义照片保存路径：" + mFile.getPath());bos = new BufferedOutputStream(new FileOutputStream(mFile));//                    Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0,
//                            data.length);Bitmap sizeBitmap = Bitmap.createScaledBitmap(bitmap,topView.getViewWidth(), topView.getViewHeight(), true);bm = Bitmap.createBitmap(sizeBitmap, topView.getRectLeft(),topView.getRectTop(),topView.getRectRight() - topView.getRectLeft(),topView.getRectBottom() - topView.getRectTop());// 截取bm.compress(Bitmap.CompressFormat.JPEG, 100, bos);//将图片压缩到流中} else {Toast.makeText(mContext, "没有检测到内存卡", Toast.LENGTH_SHORT).show();}} catch (Exception e) {e.printStackTrace();} finally {try {bos.flush();//输出bos.close();//关闭bm.recycle();// 回收bitmap空间mCamera.stopPreview();// 关闭预览mCamera.startPreview();// 开启预览if (onPathChangedListener != null) {LogUtil.d("------监听路径：" + mFile.getPath());onPathChangedListener.onValueChange(mFile.getPath());}} catch (IOException e) {e.printStackTrace();}}}};public void takePicture() {//设置参数,并拍照setCameraParams(mCamera, mScreenWidth, mScreenHeight);// 当调用camera.takePiture方法后，camera关闭了预览，这时需要调用startPreview()来重新开启预览mCamera.takePicture(null, null, jpeg);}@Overrideprotected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {super.onMeasure(widthMeasureSpec, heightMeasureSpec);}public void setAutoFocus() {mCamera.autoFocus(this);}public interface OnPathChangedListener {void onValueChange(String path);}
}

CameraTopRectView类

package ccqlk.homestay.bean;import android.app.Activity;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.view.View;
import android.view.WindowManager;/*** Created by LK-RYX on 2018/4/28.*/class CameraTopRectView extends View {private int panelWidth;private int panelHeght;private int viewWidth;private int viewHeight;public int rectWidth;public int rectHeght;private int rectTop;private int rectLeft;private int rectRight;private int rectBottom;private int lineLen;private int lineWidht;private static final int LINE_WIDTH = 5;private static final int TOP_BAR_HEIGHT = 50;private static final int BOTTOM_BTN_HEIGHT = 66;//    private static final int TOP_BAR_HEIGHT = Constant.RECT_VIEW_TOP;
//    private static final int BOTTOM_BTN_HEIGHT = Constant.RECT_VIEW_BOTTOM;private static final int LEFT_PADDING = 10;private static final int RIGHT_PADDING = 10;private static final String TIPS = "请将身份证放入到方框中";private Paint linePaint;private Paint wordPaint;private Rect rect;private int baseline;public CameraTopRectView(Context context, AttributeSet attrs) {super(context, attrs);// TODO Auto-generated constructor stubActivity activity = (Activity) context;WindowManager wm = (WindowManager) activity.getSystemService(Context.WINDOW_SERVICE);panelWidth = wm.getDefaultDisplay().getWidth();//拿到屏幕的宽panelHeght = wm.getDefaultDisplay().getHeight();//拿到屏幕的高//高度不需要dp转换px,不然整体相机会向上移动一小节
//        viewHeight = panelHeght - (int) DisplayUtil.dp2px(activity,TOP_BAR_HEIGHT + BOTTOM_BTN_HEIGHT);viewHeight = panelHeght;//viewHeight,界面的高,viewWidth,界面的宽viewWidth = panelWidth;/*rectWidth = panelWidth- UnitUtils.getInstance(activity).dip2px(LEFT_PADDING + RIGHT_PADDING);*/rectWidth = panelWidth - (int) DisplayUtil.dp2px(activity,LEFT_PADDING + RIGHT_PADDING);rectHeght = (int) (rectWidth * 54 / 85.6);// 相对于此viewrectTop = (viewHeight - rectHeght) / 2;rectLeft = (viewWidth - rectWidth) / 2;rectBottom = rectTop + rectHeght;rectRight = rectLeft + rectWidth;lineLen = panelWidth / 8;linePaint = new Paint();linePaint.setAntiAlias(true);linePaint.setColor(Color.rgb(0xdd, 0x42, 0x2f));linePaint.setStyle(Paint.Style.STROKE);linePaint.setStrokeWidth(LINE_WIDTH);// 设置线宽linePaint.setAlpha(255);wordPaint = new Paint();wordPaint.setAntiAlias(true);wordPaint = new Paint(Paint.ANTI_ALIAS_FLAG);wordPaint.setStrokeWidth(3);wordPaint.setTextSize(35);rect = new Rect(rectLeft, rectTop - 80, rectRight, rectTop - 10);Paint.FontMetricsInt fontMetrics = wordPaint.getFontMetricsInt();baseline = rect.top + (rect.bottom - rect.top - fontMetrics.bottom + fontMetrics.top) / 2 - fontMetrics.top;wordPaint.setTextAlign(Paint.Align.CENTER);}@Overridepublic void onDraw(Canvas canvas) {super.onDraw(canvas);wordPaint.setColor(Color.TRANSPARENT);canvas.drawRect(rect, wordPaint);//画蒙层wordPaint.setColor(0xa0000000);rect = new Rect(0, viewHeight/2+rectHeght/2, viewWidth, viewHeight);canvas.drawRect(rect, wordPaint);rect = new Rect(0, 0, viewWidth, viewHeight/2-rectHeght/2);canvas.drawRect(rect, wordPaint);rect = new Rect(0, viewHeight/2-rectHeght/2, (viewWidth-rectWidth)/2, viewHeight/2+rectHeght/2);canvas.drawRect(rect, wordPaint);rect = new Rect(viewWidth-(viewWidth-rectWidth)/2, viewHeight/2-rectHeght/2, viewWidth, viewHeight/2+rectHeght/2);canvas.drawRect(rect, wordPaint);//重制rect  并画文字  吧文字置于rect中间rect = new Rect(rectLeft, rectTop - 80, rectRight, rectTop - 10);wordPaint.setColor(Color.WHITE);canvas.drawText(TIPS, rect.centerX(), baseline, wordPaint);canvas.drawLine(rectLeft, rectTop, rectLeft + lineLen, rectTop,linePaint);canvas.drawLine(rectRight - lineLen, rectTop, rectRight, rectTop,linePaint);canvas.drawLine(rectLeft, rectTop, rectLeft, rectTop + lineLen,linePaint);canvas.drawLine(rectRight, rectTop, rectRight, rectTop + lineLen,linePaint);canvas.drawLine(rectLeft, rectBottom, rectLeft + lineLen, rectBottom,linePaint);canvas.drawLine(rectRight - lineLen, rectBottom, rectRight, rectBottom,linePaint);canvas.drawLine(rectLeft, rectBottom - lineLen, rectLeft, rectBottom,linePaint);canvas.drawLine(rectRight, rectBottom - lineLen, rectRight, rectBottom,linePaint);}public int getRectLeft() {return rectLeft;}public int getRectTop() {return rectTop;}public int getRectRight() {return rectRight;}public int getRectBottom() {return rectBottom;}public int getViewWidth() {return viewWidth;}public int getViewHeight() {return viewHeight;}}

DisplayUtil工具类

package ccqlk.homestay.bean;import android.content.Context;/*** Created by LK-RYX on 2018/4/28.*/public class DisplayUtil {/*** 将px装换成dp，保证尺寸不变* @param context* @param pxValue* @return*/public static int px2dp(Context context, float pxValue){float density = context.getResources().getDisplayMetrics().density;//得到设备的密度return (int) (pxValue/density+0.5f);}public static int dp2px(Context context, float dpValue){float density = context.getResources().getDisplayMetrics().density;return (int) (dpValue*density+0.5f);}public static int px2sp(Context context, float pxValue){float scaleDensity = context.getResources().getDisplayMetrics().scaledDensity;//缩放密度return (int) (pxValue/scaleDensity+0.5f);}public static int sp2px(Context context, float spValue) {float scaleDensity = context.getResources().getDisplayMetrics().scaledDensity;return (int) (spValue*scaleDensity+0.5f);}
}

再次感谢前辈们的奉献，本文核心代码原文地址：https://yq.aliyun.com/articles/26706，该文章分析的很透彻！

为了向别人、向世界证明自己而努力拼搏，而一旦你真的取得了成绩，才会明白：人无须向别人证明什么，只要你能超越自己。

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