i have a problem about ScrollView
i want add myView(extends View) to the ScrollView, myView i will draw
something, image or text,
but when i create myView and add it in the scrollView ,but get the
Height = 0 onSizeChanged(), i don't know why?
(1) myActivity
final LinearLayout layout = new LinearLayout(this);
layout.setOrientation(LinearLayout.VERTICAL);
layout.setLayoutParams(new ViewGroup.LayoutParams(
ViewGroup.LayoutParams.FILL_PARENT,
ViewGroup.LayoutParams.FILL_PARENT));
LinearLayout.LayoutParams paramS = new
LinearLayout.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT,
ViewGroup.LayoutParams.WRAP_CONTENT,1);
scroll = new ScrollView(this);
ViewGroup.LayoutParams paramSvLp = new ScrollView.LayoutParams
(
ViewGroup.LayoutParams.FILL_PARENT,
ViewGroup.LayoutParams.WRAP_CONTENT);
scroll.setLayoutParams(paramS);
layout.addView(scroll);
history = new HistoryTextView(this);
history.setLayoutParams(paramSvLp);
scroll.addView(history);
(2) HistoryTextView
public class HistoryTextView extends LinearLayout{
private Activity activity;
private EmotionTextView topText;
public HistoryTextView(Context context){
super(context);
activity = (Activity) context;
setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT,
LayoutParams.FILL_PARENT));
setOrientation(LinearLayout.VERTICAL);
setGravity(Gravity.FILL);
addItem(str);
}
public void addItem(String str)
{
LayoutParams params1 = new LayoutParams
(ViewGroup.LayoutParams.FILL_PARENT,ViewGroup.LayoutParams.FILL_PARENT);
EmotionTextView etv1 = new EmotionTextView(getContext(),
null);
String show1=" 12345678 :) ";
etv1.setLayoutParams(params1);
// etv1.invalidate();
addView(etv1);
etv1.setShowText(show1);
}
}
(3) EmotionTextView
public class EmotionTextView extends View{
public String showText;
public Paint paint;
public EmotionTextView(Context context, AttributeSet attrs) {
super(context, attrs);
// TODO Auto-generated constructor stub
//setFocusable(true);
paint = new Paint();
paint.setTextSize(20);
paint.setColor(Color.BLUE);
paint.setAntiAlias(true);
}
public void setShowText(String showText)
{
this.showText=showText;
}
protected void onSizeChanged(int w, int h, int oldw, int oldh)
{
width=w; //w = 0???
init();
}
@Override
public void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvas.drawColor(0xfff00fff);
}
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