Let me begin with the coding first. My xml file (relevant part of it) contains this:
<FrameLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1"
android:background="#ffffff">
<SurfaceView
android:id="@+id/cameraView"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:visibility="gone" />
<LinearLayout
android:id="@+id/layStatus"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:visibility="gone">
<TextView
android:id="@+id/txtStatus"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#90000000"
android:paddingBottom="5dip"
android:paddingTop="5dip"
android:gravity="center_vertical|center_horizontal"
android:textSize="20dip" />
</LinearLayout>
</FrameLayout>
As you can see I've got a basic set up, a frame layout which contains a surfaceview (which has visibility set to gone) and another layout with a simple TextView. Here is what I have in my activity:
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.mylayout);
cameraView = (SurfaceView)findViewById(R.id.cameraView);
surfaceHolder = cameraView.getHolder();
surfaceHolder.addCallback(CompassActivity.this);
surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
public void btnCameraOnClick(View target) {
cameraView.setVisibility(View.VISIBLE);
}
Starting the camera preview is done in Surface changed, which fires when visibility of the surface changes.
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
txtStatus.setVisibility(View.Visible);
txtStatus.setText("Starting camera");
camera = Camera.open();
if (camera != null){
try {
camera.setDisplayOrientation(90);
Camera.Parameters parameters = camera.getParameters();
List<Size> sizes = parameters.getSupportedPreviewSizes();
Size size = sizes.get(0);
parameters.setPreviewSize(size.width, size.height);
camera.setParameters(parameters);
camera.setPreviewDisplay(holder);
camera.startPreview();
txtStatis.setVisibility(View.GONE);
} catch (IOException e) {
}
}
}
So what's the problem ? I want to simply display a text while the camera preview starts. To do this, I make the txtStatus visible and set a text to it. When the preview is started, I simply hide it. Well, it doesn't work like this, When I press a button to start camera preview, the UI thread freezes waiting for the preview and my status message is not displayed. How can I fix it ? There is a solution at HERE but I was thinking that maybe there is a simpler one.
Thank you for your time.
