效果:(由于不好录屏所以文字描述)

定一个SurfaceView 下方有几个按钮,点击确定可以拍照保存取消.

并且SurfaceView实时显示相机内容

package qianfeng.com.customcamera;

import android.hardware.Camera;

import android.os.Bundle;

import android.os.Environment;

import android.support.v7.app.AppCompatActivity;

import android.view.SurfaceHolder;

import android.view.SurfaceView;

import android.view.View;

import java.io.File;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

public class MainActivity extends AppCompatActivity implements SurfaceHolder.Callback {

    private SurfaceView surfaceView;

    private SurfaceHolder holder;

    private Camera camera;

    private byte[] bitmap_byte;

    private int flag = 0;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        surfaceView = (SurfaceView) findViewById(R.id.camera_sv);

        holder = surfaceView.getHolder();

        //设置 Holder 的类型 表示内容 表示内容为空由其他提供

        holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

        holder.addCallback(this);

//        实例化Camera     参数表示   0：  后置摄像头  1：前置摄像头

        camera = Camera.open(flag);

        // 按照顺时针方向旋转90度

        camera.setDisplayOrientation(90);

//         获取一共有多少个摄像头

//        Camera.getNumberOfCameras();

    }

    public void onClick(View view) {

        switch (view.getId()) {

            case R.id.take_bt:

                /*

                参数1： 捕捉画面回调

                参数2：原声图片回调

                参数3： 处理过后的图片回调

                 */

                camera.takePicture(null, null, new Camera.PictureCallback() {

                    @Override

                    public void onPictureTaken(byte[] data, Camera camera) {

                        //停止预览

                        camera.stopPreview();

                        // 记录图片数据

                        bitmap_byte = data;

                    }

                });

                break;

            case R.id.cancel_bt:

                //取消

                bitmap_byte = null;

                // 开启预览

                camera.startPreview();

                break;

            case R.id.save_bt:

                // 保存

                saveToSd();

                break;

            case R.id.change_bt:

                // 切换前后摄像头

                //先释放

                camera.stopPreview();

                camera.release();

                camera = null;

                // 切换摄像头标记     与当前的标记相反即可

                if (flag == 1)

                    flag = 0;

                else if (flag == 0)

                    flag = 1;

                // 重新开启相机

                camera = Camera.open(flag);

                camera.setDisplayOrientation(90);

                try {

                    camera.setPreviewDisplay(holder);

                    camera.startPreview();

                } catch (IOException e) {

                    e.printStackTrace();

                }

                break;

        }

    }

    // 保存图片到SD卡

    private void saveToSd() {

        String filPath = null;

        if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {

            filPath = Environment.getExternalStorageDirectory().getAbsolutePath() + File.separator + "xixi.png";

        }

        try {

            FileOutputStream out = new FileOutputStream(filPath);

            out.write(bitmap_byte, 0, bitmap_byte.length);

            out.flush();

            out.close();

        } catch (FileNotFoundException e) {

            e.printStackTrace();

        } catch (IOException e) {

            e.printStackTrace();

        }

    }

    @Override

    public void surfaceCreated(SurfaceHolder holder) {

        if (camera != null) {

            try {

                //  提供预览画面

                camera.setPreviewDisplay(holder);

                // 开启预览

                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) {

        if (camera != null) {

            // 销毁的时候停止预览

            camera.stopPreview();

        }

    }

}

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical"

    tools:context="qianfeng.com.customcamera.MainActivity">

    <SurfaceView

        android:id="@+id/camera_sv"

        android:layout_width="match_parent"

        android:layout_height="400dp" />

    <LinearLayout

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:orientation="horizontal">

        <Button

            android:id="@+id/take_bt"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:onClick="onClick"

            android:text="拍照" />

        <Button

            android:id="@+id/cancel_bt"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:onClick="onClick"

            android:text="取消" />

        <Button

            android:id="@+id/save_bt"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:onClick="onClick"

            android:text="保存" />

        <Button

            android:id="@+id/change_bt"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:onClick="onClick"

            android:text="切换" />

    </LinearLayout>

</LinearLayout>