Why would the code below fail?
I have a blue relativeLayout in my main.xml. On click I'm adding a
green button.
When running on my Motorola Xoom I click the screen and I see the
green button show up, but the background changes from blue to black.
If I click again my blue background shows. Click again and I see
black...
What am I missing?
Thanks for any help.
package com.android.mikeviewtester;
import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Button;
import android.widget.RelativeLayout;
public class ViewTesterActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate( savedInstanceState );
// set the relative layout as our view
setContentView( R.layout.main );
RelativeLayout currentView = (RelativeLayout)
findViewById( R.id.MyRelativeLayout );
// set a listener
currentView.setOnTouchListener(
(android.view.View.OnTouchListener)
mOnTouchListener );
}
private android.view.View.OnTouchListener mOnTouchListener = new
android.view.View.OnTouchListener() {
public boolean onTouch(View v, MotionEvent event) {
if ( v != null )
v.onTouchEvent( event );
if ( event.getAction() == MotionEvent.ACTION_UP
) {
android.widget.RelativeLayout vw =
(android.widget.RelativeLayout) findViewById( R.id.MyRelativeLayout );
// create and add a new cyan button
Button btn = new Button(
ViewTesterActivity.this );
btn.setBackgroundColor( Color.GREEN );
vw.addView( btn, 100, 100 );
vw.invalidate();
btn.invalidate();
}
return true;
}
};
}
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android";
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="@+id/MyRelativeLayout"
android:background="#0000FF">
</RelativeLayout>
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