How to use RelativeLayout to make a custom component on Android
- by Styggentorsken
I'm trying to make a custom component based on buttons without having to deal with all the layout myself. The problem is that i can't find a way to make use of RelativeLayout to draw the thing. This is my latest attempt. A bitmap is returned by layoutManager.getDrawingCache(), but it does not show any buttons. canvas.drawColor(...) however works.
public class MyView extends View {
Button myButton;
RelativeLayout layoutManager;
public MyView(Context context) {
super(context);
initMyView();
}
public MyView(Context context, AttributeSet attrs) {
super(context);
initMyView();
// ...
}
public void initMyView() {
layoutManager = new RelativeLayout(getContext());
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
setMeasuredDimension(
MeasureSpec.getSize(measureSpec),
MeasureSpec.getSize(measureSpec) );
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
myButton = new Button(layoutManager.getContext());
myButton.setVisibility(VISIBLE);
myButton.setDrawingCacheEnabled(true);
layoutManager.addView(myButton);
layoutManager.setDrawingCacheEnabled(true);
layoutManager.layout(0, 0, 150, 150);
layoutManager.setVisibility(VISIBLE);
layoutManager.buildDrawingCache();
layoutManager.draw(canvas);
canvas.drawBitmap(layoutManager.getDrawingCache(), 0.0f, 0.0f, null);
}
}
