在RK5.1的ROM上面用Android Camera2 找不到摄像头

Chip Platform Rockchip
1

在RK5.1的ROM上面用Android Camera2 的API 根本就找不到摄像头，当然也就不能打开了，USB摄像头，求官方的解决方案啊。。。
用Camera是没有问题的

2

camera能打开usb摄像头，camera2肯定也能打开usb摄像头，有可能是你的代码问题。
你能不能把你camera2的代码发给我看看

3

我刚才用camera2测试一下，在RK5.1本版上可以打开usb摄像头。你是不是漏掉什么权限没有加

4

Activity中代码：

public class MainActivity extends Activity implements SurfaceHolder.Callback {

private SurfaceView mSurfaceView;
private CameraManager mCameraManager;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    mCameraManager = (CameraManager) getSystemService(CAMERA_SERVICE);
    mSurfaceView = findViewById(R.id.surfaceview);
    mSurfaceView.getHolder().addCallback(this);
}

@Override
public void surfaceCreated(final SurfaceHolder holder) {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
        if (checkSelfPermission(Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
            return;
        }
    }
    try {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            //在打开摄像头时，你先查看一下设备上摄像头id列表：有可能只有一个，"1"的值：根据的你情况而定
            mCameraManager.openCamera("1", new CameraDevice.StateCallback() {
                @Override
                public void onOpened(final CameraDevice camera) {
                    try {
                        // 创建预览需要的CaptureRequest.Builder
                        final CaptureRequest.Builder previewRequestBuilder =
                                camera.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
                        // 将mSurfaceView的surface作为CaptureRequest.Builder的目标
                        previewRequestBuilder.addTarget(holder.getSurface());

                        //如果holder.getSurface().isValid()为false,则会出错;因为你的画布无效导致的问题
                        if (holder.getSurface().isValid())
                        //创建相机捕获会话,用于预览的工作。
                        camera.createCaptureSession(Arrays.asList(holder.getSurface()), new CameraCaptureSession.StateCallback() {

                            @Override
                            public void onConfigured(CameraCaptureSession cameraCaptureSession) {
                                if (null == camera) {
                                    return;
                                }
                                try {
                                    //设置预览模式
                                    previewRequestBuilder.set(CaptureRequest.CONTROL_MODE, CameraMetadata.CONTROL_MODE_AUTO);
                                    // 自动对焦
                                    previewRequestBuilder.set(CaptureRequest.CONTROL_AF_MODE, CaptureRequest.CONTROL_AF_MODE_CONTINUOUS_PICTURE);
                                    // 打开闪光灯
                                    previewRequestBuilder.set(CaptureRequest.CONTROL_AE_MODE, CaptureRequest.CONTROL_AE_MODE_ON_AUTO_FLASH);
                                    //重复请求预览
                                    cameraCaptureSession.setRepeatingRequest(previewRequestBuilder.build(), null, new Handler());
                                } catch (CameraAccessException e) {
                                    e.printStackTrace();
                                }
                            }

                            @Override
                            public void onConfigureFailed(CameraCaptureSession cameraCaptureSession) {
                            }
                        }, new Handler());
                    } catch (CameraAccessException pE) {
                        Log.e(TAG,pE.getMessage());
                        pE.printStackTrace();
                    }
                }

                @Override
                public void onDisconnected(CameraDevice camera) {
                    camera.close();
                }

                @Override
                public void onError(CameraDevice camera, int error) {
                    camera.close();
                }
            }, new Handler());
        }
    } catch (CameraAccessException pE) {
        pE.printStackTrace();
    }
}

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

}

@Override
public void surfaceDestroyed(SurfaceHolder holder) {

}

}

layout中源码：

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

mainfest.xml中的源码：

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

<uses-permission android:name="android.permission.CAMERA"/>
<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/ic_launcher_round"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
    <activity android:name=".MainActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN"/>

            <category android:name="android.intent.category.LAUNCHER"/>
        </intent-filter>
    </activity>
</application>
5

USB Camera不支持热插拔，Camera service在系统启动的时候遍历了Camera，系统起来后你插入USB Camera就遍历不到了。可以通过命令stop media; start media来从新遍历，然后app就可以打开USB Camera了。

6

插拔camera看看打印信息，设备节点是否有生成？