项目中经常用到Android自带的camera拍照功能。于是做了个封装，CameraUtil.java类。
再次用到就简单啦，可以最大限度的复用提高效率。
我最喜欢对常用的功能模块进行封装，因为优秀的代码思想就是要追求最大化的复用和高效率。推荐《重构》和《程序员修炼之道》书籍。不要觉得这类书籍有些理论比较空洞，不如看某某实战之类的书籍。其实这类书籍影响的是人的思想，思想改变远比你多学几行代码重要。
好的封装，能使你做事事半功倍，像搭积木一样快速的实现应用。为啥有的大牛做东西很快？原因无他，肯定是沉淀积累了很多可以复用的轮子。
封装后的CameraUtil类使用很简单。
先来张效果图：
封装后的CameraUtil类使用有多简单？
代码语言：javascript复制 if (cameraUtil == null){
int rotation = getWindowManager().getDefaultDisplay().getRotation();
cameraUtil = new CameraUtil(surfaceView, 0,rotation, takeButton, onPictureListener);
cameraUtil.start();
}只需传进去五个参数即可。第一个就是预览的界面surfaceView,第二个参数相机ID,默认为０.第三个参数图像旋转的角度。第四个参数拍照的按钮。onPictureListener为拍完照片的回调处理。
代码语言：javascript复制/*
* 拍照信息回调
*/
OnPictureListener onPictureListener = new OnPictureListener() {
@Override
public void getPicture(Drawable drawable) {
//getCameraPicture(drawable);
final Bitmap bitmap = ((BitmapDrawable) drawable).getBitmap();
Log.d(TAG,"take picture bitmap size kb:" bitmap.getByteCount()/1024);
DataConstant.photo = Utils.bitmapToString(bitmap);
File tempFile = new File("/sdcard/temp0.png");
try {
FileOutputStream fos = new FileOutputStream(tempFile);
bitmap.compress(Bitmap.CompressFormat.PNG,100,fos);
//写入，这里会卡顿，因为图片较大
fos.flush();
//记得要关闭写入流
fos.close();
}catch (Exception ex){
ex.printStackTrace();
}
}封装如下：
代码语言：javascript复制package com.newcapec.fkrobot.util;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.ImageFormat;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.hardware.Camera;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.net.Uri;
import android.os.Build;
import android.os.Environment;
import android.util.Log;
import android.view.Surface;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import com.newcapec.fkrobot.app.App;
import com.newcapec.fkrobot.interf.OnPictureListener;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.lang.reflect.Method;
import java.util.List;
/**
* @author : yangyognzhen
* @date :2020/7/11 14:19
* @description:
**/
public class CameraUtil {
private String TAG = this.getClass().getSimpleName();
//相机和相机预览mSurfaceView
private Camera mCamera;
private SurfaceView mSurfaceView;
private SurfaceHolder mHolder;
//摄像头支持的分辨率
private Camera.Size mPreviewSize;
private List mSupportedPreviewSizes;
//private Activity activity;
private View button;
private int mCameraId;
private int additionalRotation;
private int displayOrientation = 0;
private int rotation;
private OnPictureListener onFinishListener;
private static CameraUtil _instance;
public static CameraUtil getInstance(SurfaceView surfaceView, int cameraId, int rotation, View button, OnPictureListener onFinishListener) {
if (_instance == null)
_instance = new CameraUtil(surfaceView,cameraId,rotation,button,onFinishListener);
return _instance;
}
public CameraUtil(SurfaceView surfaceView, int cameraId, int rotation, View button, OnPictureListener onFinishListener){
this.mSurfaceView = surfaceView;
this.button = button;
this.onFinishListener = onFinishListener;
mCameraId = cameraId;
this.rotation = rotation;
//初始化相机预览及回调
initData(cameraId);
}
private void initData(int id) {
//增加surfaceview回调
mHolder= mSurfaceView.getHolder();
mHolder.addCallback(callback);
//mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
mPreviewSize=getPreviewSize(id);
// mCamera.setDisplayOrientation(270);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Camera.Parameters parameters = mCamera.getParameters();
parameters.setJpegQuality(100); //生成图像的质量
mCamera.setParameters(parameters);
parameters.setPictureFormat(ImageFormat.JPEG);
parameters.setPictureSize(640, 480); //生成图像的风辨率
mCamera.setParameters(parameters);
// int ro = displayOrientation 90;
// if(ro >= 360){
// ro = 0;
// }
parameters.setRotation(displayOrientation); //生成的图像旋转90度
mCamera.setParameters(parameters);
//拍照的提示音
shootSound();
mCamera.takePicture(null,null, new Camera.PictureCallback() {
@Override
public void onPictureTaken(byte[] data, Camera camera) {
// 主要就是将图片转化成drawable，设置为固定区域的背景（展示图片），当然也可以直接在布局文件里放一个surfaceView供使用。
ByteArrayInputStream bais = new ByteArrayInputStream(data);
Drawable d = BitmapDrawable.createFromStream(bais, Environment
.getExternalStorageDirectory().getAbsolutePath()
"/img.jpeg");
Bitmap bitmap = ((BitmapDrawable) d).getBitmap();
Log.d(TAG,"fk picture bitmap size kb:" bitmap.getByteCount()/1024);
File tempFile = new File("/sdcard/temp.png");
try {
FileOutputStream fos = new FileOutputStream(tempFile);
fos.write(data);
fos.close();
}catch (Exception ex){
ex.printStackTrace();
}
if(onFinishListener != null){
onFinishListener.getPicture(d);
}
mCamera.startPreview();
try {
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
});
}
private Camera.Size getPreviewSize(int id){
mCamera = Camera.open(id);
// mCamera.setDisplayOrientation(270);
displayOrientation = getCameraOri(rotation);
Log.e(TAG,"camera displayOrientation:" displayOrientation);
mCamera.setDisplayOrientation(displayOrientation);
setCamera(mCamera);
if(mCamera!=null){
Camera.Parameters parameters = mCamera.getParameters();
//获取摄像头支持的分辨率
List<Camera.Size> sizes = parameters.getSupportedPreviewSizes();
//遍历输出摄像头支持的所有分辨率
for(Camera.Size s: sizes){
Log.e(TAG,"size=====" s.width "X" s.height);
}
Camera.Size optimalSize = Utils.getOptimalPreviewSize(sizes, sizes.get(0).height, sizes.get(0).width);
return optimalSize;
}
return null;
}
private void setCamera(Camera camera) {
mCamera = camera;
if (mCamera != null) {
mSupportedPreviewSizes = mCamera.getParameters().getSupportedPreviewSizes();
}
try {
camera.setPreviewDisplay(mHolder);
} catch (IOException exception) {
Log.e(TAG, "IOException caused by setPreviewDisplay()", exception);
}
Camera.Parameters parameters = camera.getParameters();
// 设置相片格式
parameters.setJpegQuality(100); //生成图像的质量
mCamera.setParameters(parameters);
parameters.setPictureFormat(ImageFormat.JPEG);
//parameters.setPreviewFormat(ImageFormat.YV12);
//parameters.setPictureFormat(ImageFormat.FLEX_RGB_888);
// 设置预览大小
//parameters.setPreviewSize(640, 480);
parameters.setPictureSize(640, 480); //生成图像的风辨率
mCamera.setParameters(parameters);
//List sizes = parameters.getSupportedPreviewSizes();
//Camera.Size optimalSize = Utils.getOptimalPreviewSize(sizes, 1920, 1080);
//parameters.setPreviewSize(optimalSize.width, optimalSize.height);
//设置摄像头翻转角度
//parameters.setRotation(90);
//设置镜像效果，支持的值为flip-mode-values=off,flip-v,flip-h,flip-vh;
//flip-mode-values规定了翻转（镜像）模式的取值只能为off（关闭）,flip-v（竖直翻转）,flip-h（水平翻转）,flip-vh（竖直 水平翻转）
//parameters.set("preview-flip", "flip-vh");
camera.setParameters(parameters);
}
SurfaceHolder.Callback callback = new SurfaceHolder.Callback() {
@Override
public void surfaceCreated(SurfaceHolder holder) {
try {
if (mCamera != null) {
//建立预览界面
mCamera.setPreviewDisplay(holder);
//mCamera.setDisplayOrientation(270);
}
} catch (IOException exception) {
Log.e(TAG, "IOException caused by setPreviewDisplay()", exception);
}
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
if(mCamera != null){
Camera.Parameters parameters = mCamera.getParameters();
parameters.setPreviewSize(mPreviewSize.width, mPreviewSize.height);
parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE);// 1连续对焦
setDispaly(parameters, mCamera);
//开始预览
mCamera.startPreview();
}
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
if (mCamera != null) {
mCamera.stopPreview();
}
}
};
/*
* 控制图像的正确显示方向
*/
private void setDispaly(Camera.Parameters parameters, Camera camera) {
if (Integer.parseInt(Build.VERSION.SDK) >= 8) {
// setDisplayOrientation(camera, 0);
} else {
// parameters.setRotation(90);
}
}
private int getCameraOri(int rotation) {
int degrees = rotation * 90;
switch (rotation) {
case Surface.ROTATION_0:
degrees = 0;
break;
case Surface.ROTATION_90:
degrees = 90;
break;
case Surface.ROTATION_180:
degrees = 180;
break;
case Surface.ROTATION_270:
degrees = 270;
break;
default:
break;
}
additionalRotation /= 90;
additionalRotation *= 90;
degrees = additionalRotation;
int result;
Camera.CameraInfo info = new Camera.CameraInfo();
Camera.getCameraInfo(mCameraId, info);
if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
result = (info.orientation degrees) % 360;
result = (360 - result) % 360;
} else {
result = (info.orientation - degrees 360) % 360;
}
return result;
}
/*
* 实现的图像的正确显示
*/
private void setDisplayOrientation(Camera camera, int i) {
Method downPolymorphic;
try {
downPolymorphic = camera.getClass().getMethod("setDisplayOrientation", new Class[]{int.class});
if (downPolymorphic != null) {
downPolymorphic.invoke(camera, new Object[]{i});
}
} catch (Exception e) {
Log.e("Came_e", "图像出错");
}
}
/**
* 播放系统拍照声音
*/
public void shootSound() {
MediaPlayer shootMP;
AudioManager meng = (AudioManager) App.getContext().getSystemService(Context.AUDIO_SERVICE);
int volume = meng.getStreamVolume( AudioManager.STREAM_NOTIFICATION);
if (volume != 0) {
shootMP = MediaPlayer.create(App.getContext(), Uri.parse("file:///system/media/audio/ui/camera_click.ogg"));
shootMP.start();
}
}
/**
* 开启拍照
*/
public void start() {
synchronized (this) {
if (mCamera != null) {
return;
}
//initData(0);
mCamera.startPreview();
}
}
/**
* 停掉摄像头拍照
*/
public void stop() {
synchronized (this) {
if (mCamera == null) {
return;
}
mCamera.stopPreview();
mCamera.release();
mCamera = null;
Log.e(TAG,"释放摄像头");
}
}
}
