Hello, I'm trying to show a ScrollView with a button anchored to bottom of screen. This is coded programmatically (without using XML layout for now).
The trouble is when the ScrollView has many items (requiring scrolling), it prevents the button at the bottom from showing. The bottom button is sort of pushed off the screen. Look at the code below. I have a TODO which mentions a workaround to specify the exact pixel height of the ScrollView, but this is not a good solution. If you change the for loop to add only 2 buttons, then the bottom button will show. So how do I make the ScrollView show a scrolling list, with the bottom button in view, and without specifying an exact size of the ScrollView? I've seen some discussions here: http://groups.google.com/group/android-developers/browse_thread/thread/fe2862a135b46f7f/bae38e8cf012e06a?lnk=gst&q=add+button+below+scrollview#bae38e8cf012e06a http://groups.google.com/group/android-developers/browse_thread/thread/7d45c5ba63c9f8e9/ec675a5ce8835d1d?lnk=gst&q=set+layout_weight+in+code#ec675a5ce8835d1d But I don't know how to apply these to my situation. Please help. package com.test.ScrollViewTest; import android.app.Activity; import android.os.Bundle; import android.view.Gravity; import android.view.ViewGroup.MarginLayoutParams; import android.widget.Button; import android.widget.ImageView; import android.widget.LinearLayout; import android.widget.RelativeLayout; import android.widget.ScrollView; import android.widget.TextView; public class MyScrollViewTest extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); LinearLayout ll = new LinearLayout(this); // the main layout of the screen ll.setOrientation(LinearLayout.VERTICAL); TextView tv1 = new TextView(this); tv1.setText("First line of text"); TextView tv2 = new TextView(this); tv2.setText("Second line of text"); ll.addView(tv1); ll.addView(tv2); ScrollView sv = new ScrollView(this); // You can only add one child (usually a layout) to a scrollview, // otherwise you get exception: "ScrollView can host only one direct child" LinearLayout ll2 = new LinearLayout(this); ll2.setOrientation(LinearLayout.VERTICAL); /* * TODO: PROBLEM HERE: You cannot use WRAP_CONTENT for height, because * the layout below the scrollView will not show (it's sort of pushed * off the screen - even if a margin is specified). * * An alternate value of 300 works OK (remove the bottom margin too). * But this is only suitable for screen size 320x480 in portrait mode. */ LinearLayout.LayoutParams paramsLinear = new LinearLayout.LayoutParams( LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT /*300*/); // Add 50 pixel margin to bottom of scrollview (this margin doesn't scroll) paramsLinear.bottomMargin = 50; sv.addView(ll2); // Add some stuff to scrollView to test its depth // (it should leave a margin at bottom of screen) for (int i = 1; i < 10; i++) { TextView textView = new TextView(this); textView.setText("Text View " + i); LinearLayout.LayoutParams p = new LinearLayout.LayoutParams( LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT); ll2.addView(textView, p); Button buttonView = new Button(this); buttonView.setText("Button " + i); ll2.addView(buttonView, p); } ll.addView(sv, paramsLinear); RelativeLayout rl = new RelativeLayout(this); RelativeLayout.LayoutParams paramsRelative = new RelativeLayout.LayoutParams( RelativeLayout.LayoutParams.FILL_PARENT, RelativeLayout.LayoutParams.WRAP_CONTENT); // Make the button anchored to the bottom of the screen... // ...But this doesn't work when the ScrollView has a scrolling list of items. Why?? paramsRelative.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM); rl.setLayoutParams(paramsRelative); Button b = new Button(this); b.setText("Button anchored to bottom"); rl.addView(b, paramsRelative); ll.addView(rl); setContentView(ll); } } -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
