android8 rk3399 同时支持多个USB摄像头

左手的ㄟ右手 2023-10-08 20:12 18阅读 0赞

#### 文章目录 ####

*  一、前文
 *  二、CameraHal\_Module.h
 *  三、CameraHal\_Module.cpp
 *  四、编译&烧录Image
 *  五、App验证

## 一、前文 ##

*  Android系统默认支持2个摄像头，一个前置摄像头，一个后置摄像头
 *  需要支持数量更多的摄像头，得修改Android Hal层的代码

![在这里插入图片描述][9c45fb615fee4ab6a321ad6878b77dca.png]

## 二、CameraHal\_Module.h ##

*  修改`CAMERAS_SUPPORT_MAX`  
    ![在这里插入图片描述][b4b74975e3a64fc092fca1baf7ee19ea.png]

## 三、CameraHal\_Module.cpp ##

*  修改`camera_get_number_of_cameras()`函数中变量`camInfoTmp[]`相关代码

![在这里插入图片描述][a0f48f1325fe489c8483b6d3a6a849a1.png]

![在这里插入图片描述][f5ee35fd9c3d48f3aed9fc8dc0eb6733.png]

![在这里插入图片描述][8b9da38cf72e44c79ceb2b6f7835ec56.png]

## 四、编译&烧录Image ##

该部分的修改要生效的话，需要进行全编译

*  ./build.sh
 *  ./build.sh mkimage
 *  ./build.sh mkupdate

## 五、App验证 ##

*  `AndroidManifest.xml`

<?xml version="1.0" encoding="utf-8"?>
    <manifest xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools">
    
        <uses-permission android:name="android.permission.INTERNET" />
        <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
        <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
        <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-feature
            android:name="android.hardware.camera"
            android:required="false" />
        <uses-feature
            android:name="android.hardware.camera.autofocus"
            android:required="false" />
    
    
        <application
            android:allowBackup="true"
            android:dataExtractionRules="@xml/data_extraction_rules"
            android:fullBackupContent="@xml/backup_rules"
            android:icon="@mipmap/ic_launcher"
            android:label="@string/app_name"
            android:roundIcon="@mipmap/ic_launcher_round"
            android:supportsRtl="true"
            android:theme="@style/Theme.CameraApplication"
            tools:targetApi="31">
            <activity
                android:name=".MainActivity"
                android:exported="true">
                <intent-filter>
                    <action android:name="android.intent.action.MAIN" />
                    <category android:name="android.intent.category.LAUNCHER" />
                </intent-filter>
    
                <meta-data
                    android:name="android.app.lib_name"
                    android:value="" />
            </activity>
        </application>
    
    </manifest>

*  `MainActivity.java`

package com.example.cameraapplication;
    
    import androidx.appcompat.app.AppCompatActivity;
    
    import android.hardware.Camera;
    import android.os.Bundle;
    import android.view.SurfaceHolder;
    import android.view.SurfaceView;
    import android.widget.Toast;
    
    import java.util.ArrayList;
    import java.util.List;
    
    public class MainActivity extends AppCompatActivity {
        
        private static final String TAG = MainActivity.class.getSimpleName();
    
    
        Camera camera1, camera2, camera3, camera4;
        SurfaceHolder surfaceHolder1, surfaceHolder2, surfaceHolder3, surfaceHolder4;
        SurfaceView surfaceView1, surfaceView2, surfaceView3, surfaceView4;
    
        List<Camera> cameraList = new ArrayList<>();
        List<SurfaceHolder> surfaceHolderList = new ArrayList<>();
        List<SurfaceView> surfaceViewList = new ArrayList<>();
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
        
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
    
            surfaceView1 = findViewById(R.id.camera_surface_view1);
            surfaceView2 = findViewById(R.id.camera_surface_view2);
            surfaceView3 = findViewById(R.id.camera_surface_view3);
            surfaceView4 = findViewById(R.id.camera_surface_view4);
    
            cameraList.add(camera1);
            cameraList.add(camera2);
            cameraList.add(camera3);
            cameraList.add(camera4);
    
            surfaceHolderList.add(surfaceHolder1);
            surfaceHolderList.add(surfaceHolder2);
            surfaceHolderList.add(surfaceHolder3);
            surfaceHolderList.add(surfaceHolder4);
    
            surfaceViewList.add(surfaceView1);
            surfaceViewList.add(surfaceView2);
            surfaceViewList.add(surfaceView3);
            surfaceViewList.add(surfaceView4);
    
            for(int i=0; i<cameraList.size(); i++){
        
                initCamera(i, cameraList.get(i), surfaceHolderList.get(i), surfaceViewList.get(i));
            }
    
            int number = Camera.getNumberOfCameras();//得到摄像头的个数
            Toast.makeText(MainActivity.this, "摄像头个数："+number, Toast.LENGTH_LONG).show();
        }
    
    
        private void initCamera(int number, Camera camera, SurfaceHolder surfaceHolder, SurfaceView surfaceView){
        
            try{
        
                camera = Camera.open(number);
                surfaceHolder = surfaceView.getHolder();
                surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
    
                final Camera mCamera = camera;
                surfaceHolder.addCallback(new SurfaceHolder.Callback() {
        
                    @Override
                    public void surfaceCreated(SurfaceHolder surfaceHolder) {
        
                        try {
        
                            if (mCamera!=null) {
        
                                mCamera.setPreviewDisplay(surfaceHolder);
                                mCamera.setDisplayOrientation(90);
                                mCamera.startPreview();
                            }
                        } catch (Exception e) {
        
                            e.printStackTrace();
                        }
                    }
                    @Override
                    public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
        }
                    @Override
                    public void surfaceDestroyed(SurfaceHolder holder) {
        
                        releaseCamera(mCamera);
                    }
                });
            }catch (Exception e){
        
                e.printStackTrace();
            }
        }
    
        /**
         * 释放相机资源
         */
        private void releaseCamera(Camera camera) {
        
            if (camera != null) {
        
                camera.setPreviewCallback(null);
                camera.stopPreview();
                camera.release();
                camera = null;
            }
        }
    
        /**
         * 释放相机资源
         */
        private void releaseAllCamera() {
        
            for(int i=0; i<cameraList.size(); i++){
        
                if (cameraList.get(i) != null) {
        
                    cameraList.get(i).setPreviewCallback(null);
                    cameraList.get(i).stopPreview();
                    cameraList.get(i).release();
                    cameraList.set(i, null);
                }
            }
        }
    }

*  `activity_main.xml`

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        tools:context=".MainActivity">
    
    
    
    
    
    
    
    
    
    
    
    
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            android:layout_weight="1">
            <SurfaceView
                android:id="@+id/camera_surface_view1"
                android:layout_weight="1"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:gravity="center"/>
            <SurfaceView
                android:id="@+id/camera_surface_view2"
                android:layout_weight="1"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:gravity="center"/>
        </LinearLayout>
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            android:layout_weight="1">
            <SurfaceView
                android:id="@+id/camera_surface_view3"
                android:layout_weight="1"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:gravity="center"/>
            <SurfaceView
                android:id="@+id/camera_surface_view4"
                android:layout_weight="1"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:gravity="center"/>
        </LinearLayout>
    
    
    </LinearLayout>

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[9c45fb615fee4ab6a321ad6878b77dca.png]: https://img-blog.csdnimg.cn/9c45fb615fee4ab6a321ad6878b77dca.png
[b4b74975e3a64fc092fca1baf7ee19ea.png]: https://img-blog.csdnimg.cn/b4b74975e3a64fc092fca1baf7ee19ea.png
[a0f48f1325fe489c8483b6d3a6a849a1.png]: https://img-blog.csdnimg.cn/a0f48f1325fe489c8483b6d3a6a849a1.png
[f5ee35fd9c3d48f3aed9fc8dc0eb6733.png]: https://img-blog.csdnimg.cn/f5ee35fd9c3d48f3aed9fc8dc0eb6733.png
[8b9da38cf72e44c79ceb2b6f7835ec56.png]: https://img-blog.csdnimg.cn/8b9da38cf72e44c79ceb2b6f7835ec56.png