使用Camera实现拍照

效果图：

实现代码：

package com.example.android_27__playvideo_camera_lx;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.PixelFormat;
import android.hardware.Camera;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

public class CmeraActivity extends AppCompatActivity {

    private SurfaceView surfaceView;
        private Camera camera;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_cmera);
        surfaceView = (SurfaceView) findViewById(R.id.sv_ca);

        surfaceView.getHolder().addCallback(new SurfaceHolder.Callback() {



            @Override
            public void surfaceCreated(SurfaceHolder holder) {
                //打开照相机
                camera = Camera.open();
                // 给摄像头设置参数
                Camera.Parameters parameters = camera.getParameters();
                //设置照片的输出格式
                parameters.setPictureFormat(PixelFormat.JPEG);
                // 设置照片的质量
                parameters.set("jpeg-quality",85);
                //给相机设置参数
                camera.setParameters(parameters);

                try {
                    //将摄像头的画面显示到SurfaceView控件上
                    camera.setPreviewDisplay(surfaceView.getHolder());
                    //开始预览
                    camera.startPreview();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

            @Override
            public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {

            }

            @Override
            public void surfaceDestroyed(SurfaceHolder holder) {

            }
        });
    }
    public void paizhao(View view){
        //拍照
        camera.takePicture(null, null, new Camera.PictureCallback() {
            @Override
            public void onPictureTaken(byte[] bytes, Camera camera) {
                //压缩
                //将字节数组转成图片
                Bitmap bitmap= BitmapFactory.decodeByteArray(bytes,0,bytes.length);
                try {
                    FileOutputStream fos=new FileOutputStream("/mnt/sdcard/mp/G150825_"+System.currentTimeMillis()+".png");
                    bitmap.compress(Bitmap.CompressFormat.PNG,85,fos);
                    camera.stopPreview();
                    camera.startPreview();

                } catch (FileNotFoundException e) {
                    e.printStackTrace();
                }
            }
        });
    }
}

清单文件中添加权限：

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

注意要设置成横屏：

<activity
            android:name=".CmeraActivity"
            android:screenOrientation="landscape">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            intent-filter>
        activity>