Android自定义照相机详解

<code class="hljs avrasm"> Intent intent = new Intent(); intent.setAction(MediaStore.ACTION_IMAGE_CAPTURE); startActivity(intent);</code>

<code class="hljs avrasm"> Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);intent.putExtra(MediaStore.EXTRA_OUTPUT,Uri.fromFile(mCurrentPhotoFile));startActivityForResult(intent, CAMERA_WITH_DATA);</code>

<code class="hljs java">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;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);initView();}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();//开启相机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) {Log.i(TAG, "surfaceChanged");mCamera.startPreview();}@Overridepublic void surfaceDestroyed(SurfaceHolder holder) {Log.i(TAG, "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) {Log.i(TAG, "onAutoFocus success="+success);}}}</code>

<code class="hljs xml"><uses-permission android:name="android.permission.CAMERA"><uses-feature android:name="android.hardware.camera.autofocus"></uses-feature></uses-permission></code>

<code class="hljs java"> private void setCameraParams(Camera camera, int width, int height) {Log.i(TAG,"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();for (Camera.Size size : pictureSizeList) {Log.i(TAG, "pictureSizeList size.width=" + size.width + " size.height=" + size.height);}/**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();}Log.i(TAG, "picSize.width=" + picSize.width + " picSize.height=" + picSize.height);// 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();for (Camera.Size size : previewSizeList) {Log.i(TAG, "previewSizeList size.width=" + size.width + " size.height=" + size.height);}Camera.Size preSize = getProperSize(previewSizeList, ((float) height) / width);if (null != preSize) {Log.i(TAG, "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></camera.size></camera.size></code>*/ private Camera.Size getProperSize(List 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 = 4:3 result = size; break; } } } return result; }

<code class="hljs java"> // 拍照瞬间调用private Camera.ShutterCallback shutter = new Camera.ShutterCallback() {@Overridepublic void onShutter() {Log.i(TAG,"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) {Log.i(TAG, "raw");}};//创建jpeg图片回调数据对象private Camera.PictureCallback jpeg = new Camera.PictureCallback() {@Overridepublic void onPictureTaken(byte[] data, Camera Camera) {BufferedOutputStream bos = null;Bitmap bm = null;try {// 获得图片bm = BitmapFactory.decodeByteArray(data, 0, data.length);if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {Log.i(TAG, "Environment.getExternalStorageDirectory()="+Environment.getExternalStorageDirectory());String filePath = "/sdcard/dyk"+System.currentTimeMillis()+".jpg";//照片保存路径File file = new File(filePath);if (!file.exists()){file.createNewFile();}bos = new BufferedOutputStream(new FileOutputStream(file));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} catch (IOException e) {e.printStackTrace();}}}};</code>

<code class="hljs cs"> 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);}</code>

<code class="hljs xml"><uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission></code>

<code class="hljs xml"><!--?xml version="1.0" encoding="utf-8"?--><framelayout android:layout_height="match_parent" android:layout_width="match_parent" xmlns:android="http://schemas.android.com/apk/res/android"><com.dyk.cameratest.view.camerasurfaceview android:id="@+id/cameraSurfaceView" android:layout_height="match_parent" android:layout_width="match_parent"><com.dyk.cameratest.view.rectoncamera android:layout_height="match_parent" android:layout_width="match_parent"><relativelayout android:layout_height="match_parent" android:layout_width="match_parent"></relativelayout></com.dyk.cameratest.view.rectoncamera></com.dyk.cameratest.view.camerasurfaceview></framelayout></code><button android:background="#88427ac7" android:id="@+id/takePic" android:layout_alignparentbottom="true" android:layout_centerhorizontal="true" android:layout_height="50dp" android:layout_marginbottom="20dp" android:layout_width="80dp" android:text="拍照" android:textcolor="#aaa"><code class="hljs xml"></code></button>

<code class="hljs java">package com.dyk.cameratest.view;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Point;import android.graphics.RectF;import android.util.AttributeSet;import android.util.DisplayMetrics;import android.util.Log;import android.view.MotionEvent;import android.view.View;import android.view.WindowManager;/*** Created by dyk on 2016/4/7.*/public class RectOnCamera extends View {private static final String TAG = "CameraSurfaceView";private int mScreenWidth;private int mScreenHeight;private Paint mPaint;private RectF mRectF;// 圆private Point centerPoint;private int radio;public RectOnCamera(Context context) {this(context, null);}public RectOnCamera(Context context, AttributeSet attrs) {this(context, attrs, 0);}public RectOnCamera(Context context, AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);getScreenMetrix(context);initView(context);}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(Context context) {mPaint = new Paint();mPaint.setAntiAlias(true);// 抗锯齿mPaint.setDither(true);// 防抖动mPaint.setColor(Color.RED);mPaint.setStrokeWidth(5);mPaint.setStyle(Paint.Style.STROKE);// 空心int marginLeft = (int) (mScreenWidth*0.15);int marginTop = (int) (mScreenHeight * 0.25);mRectF = new RectF(marginLeft, marginTop, mScreenWidth - marginLeft, mScreenHeight - marginTop);centerPoint = new Point(mScreenWidth/2, mScreenHeight/2);radio = (int) (mScreenWidth*0.1);}@Overrideprotected void onDraw(Canvas canvas) {super.onDraw(canvas);mPaint.setColor(Color.RED);canvas.drawRect(mRectF, mPaint);mPaint.setColor(Color.WHITE);Log.i(TAG, "onDraw");canvas.drawCircle(centerPoint.x,centerPoint.y, radio,mPaint);// 外圆canvas.drawCircle(centerPoint.x,centerPoint.y, radio - 20,mPaint); // 内圆}}</code>

<code class="hljs cs"> @Overridepublic boolean onTouchEvent(MotionEvent event) {switch (event.getAction()){case MotionEvent.ACTION_DOWN:case MotionEvent.ACTION_MOVE:case MotionEvent.ACTION_UP:int x = (int) event.getX();int y = (int) event.getY();centerPoint = new Point(x, y);invalidate();return true;}return true;}</code>

<code class="hljs java"> private IAutoFocus mIAutoFocus;/** 聚焦的回调接口 */public interface IAutoFocus{void autoFocus();}public void setIAutoFocus(IAutoFocus mIAutoFocus) {this.mIAutoFocus = mIAutoFocus;}</code>

<code class="hljs cs"> if (mIAutoFocus != null){mIAutoFocus.autoFocus();}</code>

<code class="hljs cs"> public void setAutoFocus(){mCamera.autoFocus(this);}</code>

<code class="hljs java">public class MainActivity extends Activity implements View.OnClickListener,RectOnCamera.IAutoFocus{private CameraSurfaceView mCameraSurfaceView;private RectOnCamera mRectOnCamera;private Button takePicBtn;private boolean isClicked;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);requestWindowFeature(Window.FEATURE_NO_TITLE);// 全屏显示getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);setContentView(R.layout.activity_main);mCameraSurfaceView = (CameraSurfaceView) findViewById(R.id.cameraSurfaceView);mRectOnCamera = (RectOnCamera) findViewById(R.id.rectOnCamera);takePicBtn= (Button) findViewById(R.id.takePic);mRectOnCamera.setIAutoFocus(this);takePicBtn.setOnClickListener(this);}@Overridepublic void onClick(View v) {switch (v.getId()){case R.id.takePic:mCameraSurfaceView.takePicture();break;default:break;}}@Overridepublic void autoFocus() {mCameraSurfaceView.setAutoFocus();}}</code>