So I've done a lot of searching but still can't seem to find the exact reason as to why my SurfaceView won't display. Here's a little background as to what I'm doing:
I have a Linear Layout that is set Horizontally. It contains an ImageView, then a vertical Linear Layout, and finally another ImageView. In the vertical Linear Layout, there are essential three things: another ImageView at the top, an extended SurfaceView (called MagnetView) and an ImageView below that.
Here's the xml:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="horizontal" >
<!-- Left Magnetrak -->
<ImageView
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:src="@drawable/vectorparts_01"
android:adjustViewBounds="true" />
<!-- Middle Linear Layout -->
<LinearLayout
android:layout_width="0dip"
android:layout_height="fill_parent"
android:orientation="vertical"
android:layout_weight="1">
<!-- Top Bar with Lifes and Score counter -->
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:adjustViewBounds="true">
<ImageView
android:adjustViewBounds="true"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:src="@drawable/vectorparts_22"/>
<!-- Score counter -->
<TextView
android:id="@+id/myImageViewText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_marginRight="10dp"
android:layout_marginTop="5dp"
android:gravity="center"
android:text="000000000000"
android:textColor="#000000" />
<!-- Life1 -->
<ImageView
android:id = "@+id/life1"
android:adjustViewBounds="true"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/vectorparts_13"
android:layout_alignParentLeft="true"
android:layout_marginLeft="5dp"
android:layout_marginTop="1dp"
android:gravity="center" />
<!-- Life2 -->
<ImageView
android:id = "@+id/life2"
android:adjustViewBounds="true"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/vectorparts_13"
android:layout_toRightOf="@id/life1"
android:layout_marginTop="1dp"
android:layout_marginLeft="1dp"
android:gravity="center" />
<!-- Life3 -->
<ImageView
android:id = "@+id/life3"
android:adjustViewBounds="true"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/vectorparts_13"
android:layout_toRightOf="@id/life2"
android:layout_marginTop="1dp"
android:layout_marginLeft="1dp"
android:gravity="center" />
</RelativeLayout>
<!-- SurfaceView -->
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="@+id/middlesurface">
</LinearLayout>
<!-- Bottom Bar -->
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:adjustViewBounds="true">
<ImageView
android:adjustViewBounds="true"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:src="@drawable/vectorparts_02"/>
</RelativeLayout>
</LinearLayout>
<!-- Right Magnetrak -->
<ImageView
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:src="@drawable/vectorparts_01"
android:adjustViewBounds="true" />
Essentially, I want the MagnetView to show through (or punch a hole) where I put it in the Layout. But it does not display. In fact, the only time my SurfaceView displays is when I set the activity's setContentView() to the SurfaceView explicitly, canceling out everything else.
Here is the actually Activity:
public class Magnetraks extends Activity {
MagnetView midSurf;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
midSurf = new MagnetView(this);
LinearLayout midLL = new LinearLayout(this);
midLL.findViewById(R.id.middlesurface);
midLL.addView(midSurf);
setContentView(R.layout.main);
//Debugging purposes: run to see if middleSurface view is showing up when on its own.
//setContentView(midSurf);
}
@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
midSurf.resume();
}
@Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
midSurf.pause();
}
Should I place the SurfaceView at the top of my layout xml? Are there more attributes I must set? Can I just overlay the SurfaceView over everything else, make it translucent and draw what I need? Any help would be greatly appreciated, as I cannot seem to grasp how SurfaceViews work. It seems they are apart of my View hierarchy, but then documentation tells me they are something different entirely.
Thank you.
EDIT 04/17/2012
To offer a little more info: My xml UI Designer shows a big box in the middle for my extended SurfaceView class, called MagnetView. I've outlined it in red. (Stackoverflow won't allow me to post images yet)
UI Designer view(http://24.media.tumblr.com/tumblr_m2mmqvBNwW1qcreoco1_500.jpg) http://24.media.tumblr.com/tumblr_m2mmqvBNwW1qcreoco1_500.jpg
Here's the MagnetView (SurfaceView) class:
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.PixelFormat;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
public class MagnetView extends SurfaceView implements Runnable, SurfaceHolder.Callback{
Thread mThread;
SurfaceHolder mSurfaceHolder;
volatile boolean running = false;
//Creates new surface view as well as a new surfaceholder, which allows access to the surface
public MagnetView (Context context){
super(context);
mSurfaceHolder = getHolder();
mSurfaceHolder.addCallback(this);
//this.setZOrderOnTop(true);
//getHolder().setFormat(PixelFormat.TRANSLUCENT);
}
public void resume(){
running = true;
mThread = new Thread(this);
mThread.start();
}
public void pause(){
boolean retry = true;
running = false;
while(retry){
try {
mThread.join();
retry = false;
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
@Override
public void run() {
// TODO Auto-generated method stub
while(running){
if(mSurfaceHolder.getSurface().isValid()){
Canvas canvas = mSurfaceHolder.lockCanvas();
//... actual drawing on canvas
canvas.drawARGB(100, 255, 255, 80);
mSurfaceHolder.unlockCanvasAndPost(canvas);
}
}
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
// TODO Auto-generated method stub
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
// TODO Auto-generated method stub
this.resume();
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
// TODO Auto-generated method stub
}
}
I am just putting down the changes.
Replace surface view in the xml with LinearLayout.
<LinearLayout
android:id="@+id/middleSurface"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
Get an instance of linear layout
LinearLayout surface = (LinearLayout)findViewById(R.id.surface);
Add the surface view's instance to LinearLayout
surface.addView(new MagnetView(this));
2,3 steps should be performed after setContentView(R.layout.main);