android用SurfaceView实现拍照功能

以下是自己简单做了一个实例，还需要先优，后期会做优化版本

在android7测试过

首先在AndroidManifest.xml 新增权限

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"
    tools:ignore="ProtectedPermissions"></uses-permission>
<uses-permission android:name="android.permission.CAMERA"/>

TakePictureActivity.java

package com.example.a20200712;

import android.Manifest;
import android.content.pm.PackageManager;
import android.graphics.PixelFormat;
import android.hardware.Camera;
import android.os.Build;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.ActionMode;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.SearchEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.view.WindowManager;
import android.view.accessibility.AccessibilityEvent;
import android.widget.RelativeLayout;
import android.widget.Toast;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import androidx.recyclerview.widget.RecyclerView;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Objects;

public class TakePictureActivity extends AppCompatActivity {
    //自定义
    private final int REQUEST_CODE_CAMERA = 1001;
    private final int REQUEST_CODE_WRITE_EXTERNAL_STORAGE = 1002;

    private SurfaceView surfaceView;
    private RelativeLayout relative;
    private Camera camera;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        //注意以下两行一定要写在 setContentView()方法的前面，不然会报错的
        //去掉标题栏
        getSupportActionBar().hide();
        //没有状态栏
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN);

        setContentView(R.layout.take_picture_layout);
        surfaceView = findViewById(R.id.take_picture_layout_sur);
        relative = findViewById(R.id.take_picture_layout_btns);
        //把相机内容直接输出到屏幕上
        surfaceView.getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
        //设置画面分辨率
        surfaceView.getHolder().setFixedSize(176, 144);
        //设置保持屏幕高亮
        surfaceView.getHolder().setKeepScreenOn(true);

        surfaceView.getHolder().addCallback(new surfaceViewCallback());


    }

    /**
     * 权限动态申请
     */
    public void requestPermission() {

        // checkSelfPermission 判断是否已经申请了此权限
        if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA)
                != PackageManager.PERMISSION_GRANTED ||
                ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE)
                        != PackageManager.PERMISSION_GRANTED) {
            //如果应用之前请求过此权限但用户拒绝了请求，shouldShowRequestPermissionRationale将返回 true。
            if (ActivityCompat.shouldShowRequestPermissionRationale(this,
                    Manifest.permission.CAMERA)) {

            } else {
                // ActivityCompat.requestPermissions(this,new String[]{Manifest.permission.CAMERA}, REQUEST_CODE_CAMERA);
                ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.CAMERA}, REQUEST_CODE_WRITE_EXTERNAL_STORAGE);
            }
        }
    }

    /**
     * 申请结果返回
     * @param requestCode
     * @param permissions
     * @param grantResults
     */
    @Override
    public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        if (requestCode == REQUEST_CODE_CAMERA || requestCode == REQUEST_CODE_WRITE_EXTERNAL_STORAGE) {
            for (int i = 0; i < permissions.length; i++) {
                if (grantResults[i] == PackageManager.PERMISSION_GRANTED) {
                    Toast.makeText(this, "" + "权限" + permissions[i] + "申请成功", Toast.LENGTH_SHORT).show();
                } else {
                    Toast.makeText(this, "" + "权限" + permissions[i] + "申请失败", Toast.LENGTH_SHORT).show();
                }
            }
        }
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {

        if (event.getAction() == MotionEvent.ACTION_DOWN) {
            relative.setVisibility(ViewGroup.VISIBLE);
            return true;
        }
        return super.onTouchEvent(event);
    }

    /**
     * 拍照
     * @param view
     */
    public void takePicture(View view) {
        camera.takePicture(null, null, new pictureCallback());
    }

    /**
     * 对焦
     * @param view
     */
    public void focusOnclick(View view) {
        camera.autoFocus(null);
    }

    private class pictureCallback implements Camera.PictureCallback {

        @Override
        public void onPictureTaken(byte[] data, Camera camera) {
            FileOutputStream fos = null;
            try {
                File pictureFile = new File(Environment.getExternalStorageDirectory(), System.currentTimeMillis() + ".jpg");
                fos = new FileOutputStream(pictureFile);
                fos.write(data);
                fos.close();
            } catch (Exception e) {
                e.printStackTrace();
            } finally {
                if (fos != null) {
                    try {
                        fos.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }
            if(camera!=null){
                //重新刷新相机
                camera.startPreview();
            }


        }
    }


    private final class surfaceViewCallback implements SurfaceHolder.Callback {

        @Override
        public void surfaceCreated(SurfaceHolder holder) {
            requestPermission();
            camera = Camera.open();//打开照相机
            Camera.Parameters param = camera.getParameters();//获取参数列表，由于不同厂商参数不同
            // param.setPreviewFrameRate(5);//频率
            //  param.setPictureSize(100,4608);
            Log.i("mw", param.flatten());
            param.setJpegQuality(80);

            camera.setParameters(param);
            try {
                camera.setPreviewDisplay(holder);
            } catch (IOException e) {
                e.printStackTrace();
            }
            camera.startPreview();//开始预视
        }

        @Override
        public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
            Camera.Parameters parameters = camera.getParameters();
            parameters.setPictureSize(320, 240);
            parameters.getFocusMode();
            parameters.setPictureFormat(PixelFormat.JPEG);
            camera.setParameters(parameters);
            camera.startPreview();
        }

        @Override
        public void surfaceDestroyed(SurfaceHolder holder) {
            releaseCamera();
        }

    }


    private void releaseCamera() {
        if (camera != null) {
            camera.stopPreview();
            camera.setPreviewCallback(null);
            camera.release();
            camera = null;
        }
    }


}

take_picture_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent" android:layout_height="match_parent">

    <SurfaceView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/take_picture_layout_sur"></SurfaceView>
    <RelativeLayout
        android:id="@+id/take_picture_layout_btns"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:visibility="gone"
         >
        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_toLeftOf="@id/take_picture_layout_take"
            android:layout_alignParentBottom="true"
            android:layout_marginBottom="10dp"
            android:layout_marginEnd="20dp"
            android:text="对焦"
            android:onClick="focusOnclick"></Button>

        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/take_picture_layout_take"
            android:onClick="takePicture"
            android:layout_alignParentRight="true"
            android:layout_alignParentBottom="true"
            android:layout_marginBottom="10dp"
            android:layout_marginEnd="20dp"
            android:text="拍照"></Button>

    </RelativeLayout>


</FrameLayout>

android用SurfaceView实现拍照功能

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