基于android的 rk3399 同时支持多个USB摄像头

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

二、CameraHal_Module.h

修改CAMERAS_SUPPORT_MAX

三、CameraHal_Module.cpp

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

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

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 cameraList = new ArrayList<>();
List surfaceHolderList = new ArrayList<>();
List 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

activity_main.xml