[英]Android unable to switch to front camera in surface view
我试图在表面视图中打开前置摄像头,但结果是无法连接到摄像头服务
试过的代码
mCamera= Camera.open(cameraId);
CAMERA_FACING_BACK为0
CAMERA_FACING_FRONT为1
解决办法是什么..?
是的,我得到了答案
reverseCamera.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
boolean hasFront = hasFrontCamera();
if (hasFront) {
reverseCamera.setVisibility(View.VISIBLE);
mCamera.stopPreview();
mCamera.release();
if (currentCameraId == Camera.CameraInfo.CAMERA_FACING_BACK) {
currentCameraId = Camera.CameraInfo.CAMERA_FACING_FRONT;
} else {
currentCameraId = Camera.CameraInfo.CAMERA_FACING_BACK;
}
mCamera = Camera.open(currentCameraId);
setCameraDisplayOrientation(MainActivity.this, currentCameraId, mCamera);
try {
mCamera.setPreviewDisplay(mHolder);
} catch (IOException e) {
e.printStackTrace();
}
mCamera.startPreview();
} else {
reverseCamera.setVisibility(View.GONE);
}
}
});
public static void setCameraDisplayOrientation(Activity activity,
int cameraId, android.hardware.Camera camera) {
android.hardware.Camera.CameraInfo info =
new android.hardware.Camera.CameraInfo();
android.hardware.Camera.getCameraInfo(cameraId, info);
int rotation = activity.getWindowManager().getDefaultDisplay()
.getRotation();
int degrees = 0;
switch (rotation) {
case Surface.ROTATION_0:
degrees = 0;
break;
case Surface.ROTATION_90:
degrees = 90;
break;
case Surface.ROTATION_180:
degrees = 180;
break;
case Surface.ROTATION_270:
degrees = 270;
break;
}
int result;
if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
result = (info.orientation + degrees) % 360;
result = (360 - result) % 360; // compensate the mirror
} else { // back-facing
result = (info.orientation - degrees + 360) % 360;
}
camera.setDisplayOrientation(result);
}
您可以附加AndroidManifest.xml文件吗?
也许您忘记了添加使用摄像头的权限。
<uses-permission android:name="android.permission.CAMERA" />
<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.camera.autofocus" />
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