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      1 /*
      2  * Copyright (C) 2007 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.example.android.apis.view;
     18 
     19 import com.example.android.apis.R;
     20 
     21 import android.app.Activity;
     22 import android.content.Context;
     23 import android.content.res.TypedArray;
     24 import android.os.Bundle;
     25 import android.view.ContextMenu;
     26 import android.view.MenuItem;
     27 import android.view.View;
     28 import android.view.ViewGroup;
     29 import android.view.ContextMenu.ContextMenuInfo;
     30 import android.widget.AdapterView;
     31 import android.widget.BaseAdapter;
     32 import android.widget.Gallery;
     33 import android.widget.ImageView;
     34 import android.widget.Toast;
     35 import android.widget.AdapterView.AdapterContextMenuInfo;
     36 import android.widget.AdapterView.OnItemClickListener;
     37 
     38 public class Gallery1 extends Activity {
     39 
     40     @Override
     41     public void onCreate(Bundle savedInstanceState) {
     42         super.onCreate(savedInstanceState);
     43         setContentView(R.layout.gallery_1);
     44 
     45         // Reference the Gallery view
     46         Gallery g = (Gallery) findViewById(R.id.gallery);
     47         // Set the adapter to our custom adapter (below)
     48         g.setAdapter(new ImageAdapter(this));
     49 
     50         // Set a item click listener, and just Toast the clicked position
     51         g.setOnItemClickListener(new OnItemClickListener() {
     52             public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
     53                 Toast.makeText(Gallery1.this, "" + position, Toast.LENGTH_SHORT).show();
     54             }
     55         });
     56 
     57         // We also want to show context menu for longpressed items in the gallery
     58         registerForContextMenu(g);
     59     }
     60 
     61     @Override
     62     public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) {
     63         menu.add(R.string.gallery_2_text);
     64     }
     65 
     66     @Override
     67     public boolean onContextItemSelected(MenuItem item) {
     68         AdapterContextMenuInfo info = (AdapterContextMenuInfo) item.getMenuInfo();
     69         Toast.makeText(this, "Longpress: " + info.position, Toast.LENGTH_SHORT).show();
     70         return true;
     71     }
     72 
     73     public class ImageAdapter extends BaseAdapter {
     74         private static final int ITEM_WIDTH = 136;
     75         private static final int ITEM_HEIGHT = 88;
     76 
     77         private final int mGalleryItemBackground;
     78         private final Context mContext;
     79 
     80         private final Integer[] mImageIds = {
     81                 R.drawable.gallery_photo_1,
     82                 R.drawable.gallery_photo_2,
     83                 R.drawable.gallery_photo_3,
     84                 R.drawable.gallery_photo_4,
     85                 R.drawable.gallery_photo_5,
     86                 R.drawable.gallery_photo_6,
     87                 R.drawable.gallery_photo_7,
     88                 R.drawable.gallery_photo_8
     89         };
     90 
     91         private final float mDensity;
     92 
     93         public ImageAdapter(Context c) {
     94             mContext = c;
     95             // See res/values/attrs.xml for the <declare-styleable> that defines
     96             // Gallery1.
     97             TypedArray a = obtainStyledAttributes(R.styleable.Gallery1);
     98             mGalleryItemBackground = a.getResourceId(
     99                     R.styleable.Gallery1_android_galleryItemBackground, 0);
    100             a.recycle();
    101 
    102             mDensity = c.getResources().getDisplayMetrics().density;
    103         }
    104 
    105         public int getCount() {
    106             return mImageIds.length;
    107         }
    108 
    109         public Object getItem(int position) {
    110             return position;
    111         }
    112 
    113         public long getItemId(int position) {
    114             return position;
    115         }
    116 
    117         public View getView(int position, View convertView, ViewGroup parent) {
    118             ImageView imageView;
    119             if (convertView == null) {
    120                 convertView = new ImageView(mContext);
    121 
    122                 imageView = (ImageView) convertView;
    123                 imageView.setScaleType(ImageView.ScaleType.FIT_XY);
    124                 imageView.setLayoutParams(new Gallery.LayoutParams(
    125                         (int) (ITEM_WIDTH * mDensity + 0.5f),
    126                         (int) (ITEM_HEIGHT * mDensity + 0.5f)));
    127 
    128                 // The preferred Gallery item background
    129                 imageView.setBackgroundResource(mGalleryItemBackground);
    130             } else {
    131                 imageView = (ImageView) convertView;
    132             }
    133 
    134             imageView.setImageResource(mImageIds[position]);
    135 
    136             return imageView;
    137         }
    138     }
    139 }
    140