我正在尝试在 Google Glass 中显示实时相机预览。
我正在使用所有相机默认值(并且还尝试使用几种不同的图像格式;理想情况下,我可以使用其中一种 YUV 格式),但是显示在显示器中的图像是乱码,如下所示:
布局很简单:
<?xml version="1.0" encoding="utf-8"?>
<TextureView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/scan_preview"
android:layout_width="fill_parent"
android:layout_height="fill_parent" />
这是活动代码:
public class ScanActivity extends Activity {
private static final String kTag = ScanActivity.class.getSimpleName();
private TextureView mVideoCaptureView = null;
private Camera mCamera = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_scan);
setTitle(R.string.title_scan);
mVideoCaptureView = (TextureView) findViewById(R.id.scan_preview);
mVideoCaptureView.setKeepScreenOn(true);
mVideoCaptureView.setSurfaceTextureListener(new VideoCaptureTextureListener());
}
@Override
protected void onPause() {
super.onPause();
stopVideo();
}
@Override
protected void onResume() {
super.onResume();
startVideo();
}
private void startVideo() {
if (mCamera != null) {
mCamera.release();
}
mCamera = Camera.open();
if (null != mVideoCaptureView) {
try {
mCamera.setPreviewTexture(mVideoCaptureView.getSurfaceTexture());
} catch (IOException e) {
Log.e(kTag, "Error setting preview texture", e);
return;
}
}
mCamera.startPreview();
}
private void stopVideo() {
if (null == mCamera)
return;
try {
mCamera.stopPreview();
mCamera.setPreviewDisplay(null);
mCamera.setPreviewTexture(null);
mCamera.release();
} catch (IOException e) {
Log.w(kTag, e);
}
mCamera = null;
}
private final class VideoCaptureTextureListener implements TextureView.SurfaceTextureListener {
@Override
public boolean onSurfaceTextureDestroyed(SurfaceTexture surface) {
stopVideo();
return true;
}
@Override
public void onSurfaceTextureAvailable(SurfaceTexture surface, int width, int height) {
startVideo();
}
@Override
public void onSurfaceTextureSizeChanged(SurfaceTexture surface, int width, int height) {
}
@Override
public void onSurfaceTextureUpdated(SurfaceTexture surface) {
}
}
}
你知道为什么这个完全未经处理的相机预览不能正确显示吗?