android camera.open失败的问题
首先,相机没有被占用,不存在release的问题
也不是2.3版本open需要带参数的问题
**问题1:**
我在button的监听里open,提示“fail to connect to camera service”
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
Log.i("", "tack picture clicked");
Camera camera = Camera.open();
}
});
如果我新建MySurfaceView继承SurfaceView类,并且实现SurfaceHolder.Callback,然后在surfaceCreated调用Camera.open就不会出错,然后得到一个相机实例一定呀在surfaceCreated里吗?
**问题2:**
如果我在MySurfaceView类里获取SurfaceHolder是通过this.getHolder(),则Camera.open没有问题;如果是在XML里声明一个SurfaceView控件,然后获取控件指针传递到MySurfaceView,再通过这个指针getHolder(),那么open的时候也会出现上述错误,why?
@SuppressWarnings("deprecation")
public void cameraInit(SurfaceView surfaceView){
mSurfaceHolder = surfaceView.getHolder();
//mSurfaceHolder = this.getHolder();
if(null!=mSurfaceHolder){
mSurfaceHolder.addCallback(this);
mSurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
}
@Override
public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) {
Log.i(TAG, "changed");
if(null!=mCamera)
{
Camera.Parameters params = mCamera.getParameters();
params.setPictureFormat(PixelFormat.JPEG);
params.setPreviewSize(arg2,arg3);//arg2--width, arg3--height
mCamera.setParameters(params);
mCamera.startPreview();
}
}
@Override
public void surfaceCreated(SurfaceHolder arg0) {
Log.i(TAG, "create");
if(null==mCamera){
mCamera = Camera.open();
try {
mCamera.setPreviewDisplay(mSurfaceHolder);
} catch (IOException e) {
e.printStackTrace();
}
}
}