I added 2 dummy views at the ends of the Gallery then wrote a onItemSelectedListener that essentially listens for items 0 and the last item (the dummy views) and sets the selection to 1 and the last item -1 respectively. This creates the bounce me having to do any animations! I created a full screen gallery view and each item in the adapter takes up the entire screen (just like a home screen with various full screen panels). I also modified the onFling so the gallery only moves one screen at a time (much like an Android or iPhone home screen).
I uploaded the code and a sample movie of what I did on Google Code: http://code.google.com/p/androidanimations/downloads/detail?name=androidmodifiedgallery.mov&can=2&q= http://code.google.com/p/androidanimations/downloads/list Here are some snippets of the modified Gallery: --------------------- package com.nikb.gallery; import android.content.Context; import android.util.AttributeSet; import android.util.Log; import android.view.Display; import android.view.LayoutInflater; import android.view.MotionEvent; import android.view.View; import android.view.ViewGroup; import android.view.WindowManager; import android.widget.AdapterView; import android.widget.BaseAdapter; import android.widget.Gallery; import android.widget.SpinnerAdapter; import android.widget.TextView; import android.widget.AdapterView.OnItemSelectedListener; public class ModifiedGallery extends Gallery { private static final boolean ISLOG = true; private static final String TAG = ModifiedGallery.class.getSimpleName(); private float modifiedVelocityX; public ModifiedGallery(Context context) { super(context); init(); } public ModifiedGallery(Context context, AttributeSet attrs) { super(context, attrs); init(); } public ModifiedGallery(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); init(); } private void init() { Display display = ((WindowManager) getContext().getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay(); int width = display.getWidth(); int height = display.getHeight(); if (ISLOG) Log.d(TAG, "Width is " + display.getWidth() + " and height is " + display.getHeight()); modifiedVelocityX = (float) (width * 1.7); setOnItemSelectedListener(new OnItemSelectedListener() { @Override public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2, long arg3) { int pos = getSelectedItemPosition(); Log.d(TAG, "Selected item is " + getSelectedItemPosition()); if (pos == 0) { Log.d(TAG, "Animating to the first item"); setSelection(1); } else { int count = getCount(); if (pos == count - 1) { Log.d(TAG, "Animating to " + (count - 2)); setSelection(count - 2); } } } @Override public void onNothingSelected(AdapterView<?> arg0) { } }); } @Override public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) { float mod = velocityX < 0 ? -modifiedVelocityX : modifiedVelocityX; if (getSelectedItemPosition() == 1 || getSelectedItemPosition() == getAdapter().getCount() - 2) { mod = velocityX < 0 ? -1 : 1; } if (ISLOG) Log.d(TAG, "Original velocity X was " + velocityX + " & modified velocity is " + mod); return super.onFling(e1, e2, mod, velocityY); } @Override public void setAdapter(SpinnerAdapter adapter) { super.setAdapter(new BounceGalleryAdapter(adapter)); setSelection(1); // set it to the first position by default } class BounceGalleryAdapter extends BaseAdapter { private static final int ELASTICITY_DIP = 50; //how far to stretch at the ends private SpinnerAdapter mAdapter; private TextView dummyText2; private TextView dummyText1; private LayoutInflater layoutInflater; public BounceGalleryAdapter(SpinnerAdapter adapter) { this.mAdapter = adapter; } @Override public int getCount() { // account for a bounce on both ends so add 2 dummy views. return mAdapter.getCount() + 2; } @Override public Object getItem(int position) { return mAdapter.getItem(position); } @Override public long getItemId(int position) { return mAdapter.getItemId(position); } @Override public View getView(int position, View convertView, ViewGroup parent) { Log.d(TAG, "Getting view for position:" + position); if (layoutInflater == null) { layoutInflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE); } if (position == 0) // the first position { if (convertView == null || dummyText1 == null) { dummyText1 = new TextView(getContext()); dummyText1.setLayoutParams(new Gallery.LayoutParams(ELASTICITY_DIP, Gallery.LayoutParams.FILL_PARENT)); convertView = dummyText1; } return convertView; } else if (position == getCount() - 1) // the last position { if (convertView == null || dummyText2 == null) { dummyText2 = new TextView(getContext()); dummyText2.setLayoutParams(new Gallery.LayoutParams(ELASTICITY_DIP,Gallery.LayoutParams.FILL_PARENT)); convertView = dummyText2; } return convertView; } else { return mAdapter.getView(position - 1, convertView, parent); } } } } ---------------------- package com.nikb.gallery; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.view.ViewGroup; import android.view.Window; import android.view.WindowManager; import android.widget.BaseAdapter; import android.widget.Gallery; import android.widget.ImageView; public class BounceGalleryActivity extends Activity { private final class SimpleImageAdapter extends BaseAdapter { ImageView one = null; ImageView two = null; ImageView three = null; @Override public View getView(int position, View convertView, ViewGroup parent) { if(position == 0) { if(convertView == null) { one = new ImageView(BounceGalleryActivity.this); one.setBackgroundResource(R.drawable.one); one.setLayoutParams(new Gallery.LayoutParams(Gallery.LayoutParams.FILL_PARENT, Gallery.LayoutParams.FILL_PARENT)); convertView = one; } return convertView; } else if(position == 1) { if(convertView == null) { two = new ImageView(BounceGalleryActivity.this); two.setBackgroundResource(R.drawable.two); two.setLayoutParams(new Gallery.LayoutParams(Gallery.LayoutParams.FILL_PARENT, Gallery.LayoutParams.FILL_PARENT)); convertView = two; } return convertView; } else if (position == 2) { if(convertView == null) { three = new ImageView(BounceGalleryActivity.this); three.setBackgroundResource(R.drawable.three); three.setLayoutParams(new Gallery.LayoutParams(Gallery.LayoutParams.FILL_PARENT, Gallery.LayoutParams.FILL_PARENT)); convertView = three; } return convertView; } else { throw new RuntimeException("Incorrect Index " + position); } } @Override public long getItemId(int position) { return 0; } @Override public Object getItem(int position) { return null; } @Override public int getCount() { return 3; } } /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); setContentView(R.layout.messages); Gallery gallery = (Gallery) findViewById(R.id.gallery); gallery.setAdapter(new SimpleImageAdapter()); gallery.setSpacing(0); gallery.setUnselectedAlpha(1); } } -- You received this message because you are subscribed to the Google Groups "Android Developers" group. 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