Android 如何检测是否有前置摄像头，以及如何接触和使用前置摄像头？

如何检测是否有前置摄像头，以及如何接触和使用前置摄像头

如何检测是否有前置摄像头，以及如何接触和使用前置摄像头

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至少在安卓2.2中，还没有针对这一点的API。幸运的是，即将发布的姜饼版本将增加对前置摄像头的内置支持。对不起

如果您使用的是API level 9（Android 2.3）或更高版本，您可以执行以下操作来计算（第一个）前置摄像头的索引：

int getFrontCameraId() {
    CameraInfo ci = new CameraInfo();
    for (int i = 0 ; i < Camera.getNumberOfCameras(); i++) {
        Camera.getCameraInfo(i, ci);
        if (ci.facing == CameraInfo.CAMERA_FACING_FRONT) return i;
    }
    return -1; // No front-facing camera found
}

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获取相关摄像头。

您的代码将不支持高于21的sdk，因此我添加了以下行以使其可用：）

int getFrontCameraId（CameraManager cManager）{
如果（Build.VERSION.SDK_INT<22）{
Camera.CameraInfo ci=新的Camera.CameraInfo（）；
对于（int i=0；i对于（int j=0；jKalpit，我不知道你是如何让代码工作的。我试图编辑你的答案，但完整的答案需要更改。下面是我得到的

@SuppressLint("NewApi" )
int getFrontCameraId() {
    if (Build.VERSION.SDK_INT < 22) {
        Camera.CameraInfo ci = new Camera.CameraInfo();
        for (int i = 0; i < Camera.getNumberOfCameras(); i++) {
            Camera.getCameraInfo(i, ci);
            if (ci.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) return i;
        }
    } else {
        try {
            CameraManager cManager = (CameraManager) getApplicationContext()
               .getSystemService(Context.CAMERA_SERVICE);
            String[] cameraId = cManager.getCameraIdList();
            for ( int j = 0;j<cameraId.length; j++) {
                CameraCharacteristics characteristics = cManager.getCameraCharacteristics(cameraId[j]);
                int cOrientation = characteristics.get(CameraCharacteristics.LENS_FACING);
                if (cOrientation == CameraCharacteristics.LENS_FACING_FRONT)
                    return Integer.parseInt(cameraId[j]);
            }
        } catch (CameraAccessException e) {
            e.printStackTrace();
        }
    }
    return -1; // No front-facing camera found
}

@SuppressLint（“NewApi”）
int getFrontCameraId（）{
如果（Build.VERSION.SDK_INT<22）{
Camera.CameraInfo ci=新的Camera.CameraInfo（）；
对于（int i=0；i对于（int j=0；jRelated:（但根本没有答案）检查cameraid在kindle fire上不起作用。它只有一个前置摄像头，id==后端摄像头id。
    int getFrontCameraId(CameraManager cManager) {
    if (Build.VERSION.SDK_INT < 22) {
        Camera.CameraInfo ci = new Camera.CameraInfo();
        for (int i = 0; i < Camera.getNumberOfCameras(); i++) {
            Camera.getCameraInfo(i, ci);
            if (ci.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) return i;
        }
    } else {
        try {
            for ( int j = 0;j<cManager.getCameraIdList().length; j++) {
                String[] cameraId = cManager.getCameraIdList();
                CameraCharacteristics characteristics = cManager.getCameraCharacteristics(cameraId[j]);
                int cOrientation = characteristics.get(CameraCharacteristics.LENS_FACING);
                if (cOrientation == CameraCharacteristics.LENS_FACING_FRONT) 
                    return j;
            }
        } catch (CameraAccessException e) {
            e.printStackTrace();
        }
    }

    return -1; // No front-facing camera found
}

@SuppressLint("NewApi" )
int getFrontCameraId() {
    if (Build.VERSION.SDK_INT < 22) {
        Camera.CameraInfo ci = new Camera.CameraInfo();
        for (int i = 0; i < Camera.getNumberOfCameras(); i++) {
            Camera.getCameraInfo(i, ci);
            if (ci.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) return i;
        }
    } else {
        try {
            CameraManager cManager = (CameraManager) getApplicationContext()
               .getSystemService(Context.CAMERA_SERVICE);
            String[] cameraId = cManager.getCameraIdList();
            for ( int j = 0;j<cameraId.length; j++) {
                CameraCharacteristics characteristics = cManager.getCameraCharacteristics(cameraId[j]);
                int cOrientation = characteristics.get(CameraCharacteristics.LENS_FACING);
                if (cOrientation == CameraCharacteristics.LENS_FACING_FRONT)
                    return Integer.parseInt(cameraId[j]);
            }
        } catch (CameraAccessException e) {
            e.printStackTrace();
        }
    }
    return -1; // No front-facing camera found
}