Android 自定义相机Demo 入门学习

骑猪看日落 2022-05-22 21:07 742阅读 0赞

Android 自定义相机Demo

本文是参考网上一些自定义相机示例，再结合自己对相机的功能需求写的，基本上包含了很多基本功能，比如相机对焦、闪光灯，以及在手机预览界面上绘制自己想要绘制的图案。

话不多说，先上一张图：  
![相机应用界面][70]

应用是在Android Studio中开发的，java程序如下：

//主程序
    import android.annotation.SuppressLint;
    import android.content.Context;
    import android.content.Intent;
    import android.content.pm.PackageManager;
    import android.graphics.ImageFormat;
    import android.hardware.Camera;
    import android.os.Bundle;
    import android.support.v7.app.AppCompatActivity;
    import android.util.Log;
    import android.view.View;
    import android.widget.Button;
    import android.widget.FrameLayout;
    import android.widget.ImageView;
    
    import java.io.File;
    import java.io.FileNotFoundException;
    import java.io.FileOutputStream;
    import java.io.IOException;
    
    @SuppressLint("NewApi")
    public class CameraActivity extends AppCompatActivity { 
        protected static final String TAG = "main";
        private Camera mCamera;
        private CameraPreview mPreview;
        private static int Cur_State = 0;
        public ImageView imgDu;
        public File pictureFile;
        Draw draw;
        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_camera);
    
            imgDu = (ImageView) findViewById(R.id.img1);  
            mCamera = getCameraInstance();
            draw = new Draw(CameraActivity.this);
    
            // 创建预览类，并与Camera关联，最后添加到界面布局中
            mPreview = new CameraPreview(this, mCamera);
            FrameLayout preview = (FrameLayout) findViewById(R.id.camera_preview);
    
            preview.addView(mPreview);
            preview.addView(draw);
    
            Button captureButton = (Button) findViewById(R.id.button_capture);  //button_capture
    
            captureButton.setOnClickListener(new View.OnClickListener() {
                @SuppressWarnings("deprecation")
                @Override
                public void onClick(View v) {
                    Camera.Parameters parameters = mCamera.getParameters();
                    // 设置相片格式
                    parameters.setJpegQuality(100);  //生成图像的质量
                    mCamera.setParameters(parameters);
                    parameters.setPictureFormat(ImageFormat.JPEG);
                    // 设置预览大小
                    parameters.setPreviewSize(800, 480);
                    parameters.setPictureSize(4160, 3120); //生成图像的风辨率
                    mCamera.setParameters(parameters);
                    parameters.setRotation(90);  //生成的图像旋转90度
                    mCamera.setParameters(parameters);
                    parameters.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);
                    mCamera.setParameters(parameters);
                    mCamera.autoFocus(new Camera.AutoFocusCallback() {
                        @Override
                        public void onAutoFocus(boolean success, Camera camera) {
                            // 从Camera捕获图片
                            mCamera.takePicture(null, null, mPicture);
                        }
                    });
                    /*if (Cur_State < 2) { switch (Cur_State) { case 0: parameters.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH); mCamera.setParameters(parameters); mCamera.autoFocus(new Camera.AutoFocusCallback() { @Override public void onAutoFocus(boolean success, Camera camera) { // 从Camera捕获图片 mCamera.takePicture(null, null, mPicture); } }); Cur_State++; break; case 1: parameters.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);//FLASH_MODE_OFF mCamera.setParameters(parameters); mCamera.autoFocus(new Camera.AutoFocusCallback() { @Override public void onAutoFocus(boolean success, Camera camera) { // 从Camera捕获图片 mCamera.takePicture(null, null, mPicture); } }); Cur_State++; break; } } else { Cur_State = 0; }*/
    
            }
            });
        }
        /** 检测设备是否存在Camera硬件 */
        private boolean checkCameraHardware(Context context) {
            if (context.getPackageManager().hasSystemFeature(
                    PackageManager.FEATURE_CAMERA)) {
                // 存在
                return true;
            } else {
                // 不存在
                return false;
            }
        }
        /** 打开一个Camera */
        public static Camera getCameraInstance() {
            Camera c = null;
            try {
                c = Camera.open();
            } catch (Exception e) {
                Log.d(TAG, "打开Camera失败失败");
            }
            return c;
        }
    
        private Camera.PictureCallback mPicture = new Camera.PictureCallback() {
    
            @Override
            public void onPictureTaken(byte[] data, Camera arg1) {
                //将拍照得到的数据信息存储到本地
                File tempFile=new File("/sdcard/temp.png");
                try {
                    FileOutputStream fos=new FileOutputStream(tempFile);
                    fos.write(data);
                    fos.close();
    
        //注意，，，然后将这个照片的数据信息传送给要进行展示的Activity即可，这部
        //分代码是我自己需要的，你使用时需要将他去掉修改成你的。
                    Intent intent=new Intent(CameraActivity.this,MainActivity.class);
                    intent.putExtra("PicturePath", tempFile.getAbsolutePath());
                    startActivity(intent);
                    //拍照结束之后销毁当前的Activity，进入到图片展示界面
                    CameraActivity.this.finish();
                } catch (FileNotFoundException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        };
    
        @Override
        protected void onDestroy() {
            // 回收Camera资源
            if(mCamera!=null){
                mCamera.stopPreview();
                mCamera.release();
                mCamera=null;
            }
            super.onDestroy();
        }
    }

/** * 定义一个预览类 预览界面设置 */
    import android.annotation.SuppressLint;
    import android.content.Context;
    import android.hardware.Camera;
    import android.util.Log;
    import android.view.SurfaceHolder;
    import android.view.SurfaceView;
    import java.io.IOException;
    
    @SuppressLint("NewApi")
    public class CameraPreview extends SurfaceView implements SurfaceHolder.Callback { 
        private static final String TAG = "main";
        private SurfaceHolder mHolder;
        @SuppressWarnings("deprecation")
        private Camera mCamera;
    
        @SuppressWarnings("deprecation")
        public CameraPreview(Context context, Camera camera) {
            super(context);
            mCamera = camera;
            // 通过SurfaceView获得SurfaceHolder
            mHolder = getHolder();
            // 为SurfaceHolder指定回调
            mHolder.addCallback(this);
            mCamera.setDisplayOrientation(90);
        }
    
        public void surfaceCreated(SurfaceHolder holder) {
            // 当Surface被创建之后，开始Camera的预览
            try {
                mCamera.setPreviewDisplay(holder);
                mCamera.startPreview();
            } catch (IOException e) {
                Log.d(TAG, "预览失败");
            }
        }
    
        public void surfaceDestroyed(SurfaceHolder holder) {
    
        }
    
        public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
            // Surface发生改变的时候将被调用，第一次显示到界面的时候也会被调用
            if (mHolder.getSurface() == null){
                // 如果Surface为空，不继续操作
                return;
            }
    
            // 停止Camera的预览
            try {
                mCamera.stopPreview();
    
            } catch (Exception e){
                Log.d(TAG, "当Surface改变后，停止预览出错");
            }
    
            // 重新开始预览
            try {
                mCamera.setPreviewDisplay(mHolder);
                mCamera.startPreview();
    
            } catch (Exception e){
                Log.d(TAG, "预览Camera出错");
            }
        }
    }

/** * Created by Administrator on 2018/1/24. * 这个是在预览界面绘制图案部分 */
    import android.annotation.SuppressLint;
    import android.content.Context;
    import android.graphics.Bitmap;
    import android.graphics.Canvas;
    import android.graphics.Color;
    import android.graphics.Paint;
    import android.graphics.Path;
    import android.view.View;
    
    public class Draw extends View { 
        private Canvas canvas;//声明画笔
        private Paint paint;//声明画布
        private Paint paint1;
        private Paint paint2;
    
        private Bitmap bitmap;//声明位图
    
        public Draw(Context context)
        {
            super(context);
            // TODO 自动生成的构造函数存根
            //创建一个画笔
            paint = new Paint(Paint.DITHER_FLAG);
            paint1 = new Paint(Paint.DITHER_FLAG);
            paint2 = new Paint(Paint.DITHER_FLAG);
            //设置位图的宽高，采用32位ARGB位图模式
            bitmap = Bitmap.createBitmap(720, 1280, Bitmap.Config.ARGB_8888);
            canvas = new Canvas(bitmap);
    
            paint.setStyle(Paint.Style.STROKE);//设置非填充
            paint.setStrokeWidth(2);//笔宽5像素
            paint.setColor(Color.RED);//设置为红笔
            paint.setAntiAlias(true);//锯齿不显示
            paint.setDither(true);//设置图像抖动处理
            paint.setStrokeJoin(Paint.Join.ROUND);//设置图像的结合方式
            paint.setStrokeCap(Paint.Cap.ROUND);//设置画笔为圆形样式
    
            paint1.setStyle(Paint.Style.FILL);//设置非填充
            paint1.setStrokeWidth(33);//笔宽5像素
            paint1.setStrokeJoin(Paint.Join.ROUND);//设置图像的结合方式
            paint1.setStrokeCap(Paint.Cap.ROUND);//设置画笔为圆形样式
            paint1.setColor(Color.BLACK);//设置为黑笔
            paint.setAntiAlias(true);//锯齿不显示
            paint.setDither(true);//设置图像抖动处理
    
            paint2.setStyle(Paint.Style.FILL);//设置填充
            paint2.setStrokeWidth(12);//笔宽5像素
            paint2.setAntiAlias(true);//锯齿不显示
            paint2.setDither(true);//设置图像抖动处理
            paint2.setStrokeJoin(Paint.Join.ROUND);//设置图像的结合方式
            paint2.setStrokeCap(Paint.Cap.ROUND);//设置画笔为圆形样式
            paint2.setColor(Color.BLACK);//设置为黑笔
        }
    
        @SuppressLint("DrawAllocation")
        @Override
        protected void onDraw(Canvas canvas)
        {
            // TODO 自动生成的方法存根
            super.onDraw(canvas);
            canvas.drawBitmap(bitmap, 0, 0, paint);
    
            float[] pts = {
       0,240,260,70};
            canvas.drawLines(pts , paint);   //在画布上画线 1
            float[] pts2 = {
       695,522,340,1040};
            canvas.drawLines(pts2, paint);   //在画布上画线 2
    
            Path mPath = new Path();
            mPath.moveTo(260, 70);
            mPath.quadTo(780, 0, 695, 522);
            canvas.drawPath(mPath, paint);    //塞尔塔曲线
    
            Path path = new Path();      //定义一条路径
            path.moveTo(0,0);      //移动到 坐标(0,0)
            path.lineTo(0,240);
            path.lineTo(270,62);
            path.lineTo(270,0);
            path.lineTo(0,0);
            canvas.drawPath(path, paint2);
    
            Path path1 = new Path();      //定义一条路径
            path1.moveTo(260,0);    //移动到 坐标(260,0)
            path1.lineTo(720,0);
            path1.lineTo(720,60);
            path1.lineTo(260,60);
            path1.lineTo(260,0);
            canvas.drawPath(path1, paint2);
    
            Path path2 = new Path();       //定义一条路径
            path2.moveTo(720,60);    //移动到 坐标(720,60)
            path2.lineTo(720,522);
            path2.lineTo(715,522);
            path2.lineTo(715,512);
            path2.lineTo(700,60);
            path2.lineTo(720,60);
            canvas.drawPath(path2, paint2);
    
            Path path3 = new Path();        //定义一条路径
            path3.moveTo(340,1040);   //移动到 坐标(340,1040)
            path3.lineTo(720,1040);
            path3.lineTo(720,522);
            path3.lineTo(710,512);
            path3.lineTo(340,1040);
            canvas.drawPath(path3, paint2);
    
            Path path4 = new Path();        //定义一条路径
            path4.moveTo(720,200);   //移动到 坐标(715,512)
            path4.lineTo(500,60);
            path4.lineTo(720,60);
            path4.lineTo(720,200);
            canvas.drawPath(path4, paint2);
    
            float[] pts3 = {
       720,108,450,56};
            canvas.drawLines(pts3, paint2);   //在画布上画线 3
    
            float[] pts4 = {
       715,230,630,110};
            canvas.drawLines(pts4, paint1);   //在画布上画线 4
            float[] pts5 = {
       660,130,718,272};
            canvas.drawLines(pts5, paint1);   //在画布上画线 5
            float[] pts6 = {
       714,522,720,440};
            canvas.drawLines(pts6, paint1);   //在画布上画线 6
        }
    }

布局文件 activity\_camera.xml

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" >
        <FrameLayout android:id="@+id/camera_preview" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_weight="1" />
    
        <Button android:id="@+id/button_capture" android:text="拍照" android:textColor="#6633cc" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_gravity="bottom" />
    
    </LinearLayout>

应用权限：

<uses-permission android:name="android.permission.CAMERA"/> >
        <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
        <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
        <uses-permission android:name="android.permission.RECORD_AUDIO" />
        <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />

具体的细节就不在说明，可以自己在网上搜一下相关知识，大家使用中有什么问题可以留言哦，如果能解决尽量帮大家解决。

[70]: /images/20220523/ce5a873ac8ec49fba125c213caaf1e43.png