Hi, i m new to android. I am trying to create custom component.
developer wil use this component just like any other component like
textview or editText in his layout.xml file. I want this component to
be created and rendered by java file only. No layout xml is used. i am
not sure whether to extend my class to View or ViewGroup or some
layout and then add say textview and/or edittext. i tried by extending
to View class but faced many problems in adding simple textVIew to it.
I am pasting following code. Problem with it is. I can see red square
(which i think is a viewgroup) on emulator but not able to see
textView added to it. Please help me. i have expressed my intentions
above, to create forms or a form like reusable component.
//My form impletation java file
public class Form extends ViewGroup
{
AttributeSet attrSet;
LinearLayout.LayoutParams layParams;
Context moContext;
public Form(Context context)
{
super(context);
this.moContext = context;
initForm();
}
public Form(Context context, AttributeSet attributeSet)
{
super(context,attributeSet);
this.attrSet = attributeSet;
this.moContext = context;
initForm();
}
@Override
protected void onDraw(Canvas canvas)
{
super.onDraw(canvas);
setVisibility(VISIBLE);
initForm();
}
public void initForm()
{
setVisibility(VISIBLE);
layParams = new
LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT,
LayoutParams.FILL_PARENT);
layParams.gravity = LinearLayout.HORIZONTAL;
layParams.setMargins(5, 5, 5, 5);
setLayoutParams(layParams);
setBackgroundColor(Color.RED);
TextView textView = new TextView(getContext(), attrSet);
textView.setText("AAAAAAAAAAAAA");
textView.setBackgroundColor(Color.YELLOW);
textView.bringToFront();
invalidate();
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b)
{
}
}
//layout.xml which will be used by some activity
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/
android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<com.android.custom.Form
android:id="@+id/mform"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
</LinearLayout>
Please guide me through.
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