Android 圖片瀏覽器-Gallery的簡單應用

這周利用休息時間又學習了Gallery，然後隨便寫了一個圖片瀏覽的東東。

首先看一下介面：

點擊下面的圖片，在上面相應的顯示出來。

代碼如下：

View Code

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical" >        <ImageView            android:id="@+id/imageView"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:background="@drawable/star_red"            android:scaleType="matrix"             android:layout_weight="4"            />        <Gallery            android:id="@+id/gallery"            android:layout_width="fill_parent"            android:layout_height="wrap_content"            android:layout_gravity="center_vertical"            android:layout_weight="1"            android:spacing="5dp" >        </Gallery></LinearLayout>

View Code

  1 package com.example.griview;  2   3 import javax.xml.parsers.SAXParser;  4 import javax.xml.parsers.SAXParserFactory;  5   6 import org.xml.sax.helpers.DefaultHandler;  7 import org.xmlpull.v1.XmlSerializer;  8   9 import android.os.Bundle; 10 import android.app.Activity; 11 import android.app.ActivityManager; 12 import android.content.Context; 13 import android.view.Menu; 14 import android.view.View; 15 import android.view.ViewGroup; 16 import android.view.ViewGroup.LayoutParams; 17 import android.widget.AdapterView; 18 import android.widget.AdapterView.OnItemClickListener; 19 import android.widget.BaseAdapter; 20 import android.widget.Gallery; 21 import android.widget.GridView; 22 import android.widget.ImageView; 23 import android.widget.Toast; 24  25 public class MainActivity extends Activity { 26  27     private Gallery gallery; 28     private ImageView imageView; 29     protected void onCreate(Bundle savedInstanceState) { 30         super.onCreate(savedInstanceState); 31         setContentView(R.layout.relative); 32         gallery=(Gallery) findViewById(R.id.gallery); 33         imageView=(ImageView) findViewById(R.id.imageView); 34         gallery.setAdapter(new ImageAdapter(this)); 35  36         gallery.setOnItemClickListener(new OnItemClickListener() { 37  38             public void onItemClick(AdapterView<?> parent, View view, int position, 39                     long id) { 40                 imageView.setBackgroundResource(mThumbIds[position]); 41                 //彈出單擊的GridView元素的位置  42                 Toast.makeText(MainActivity.this, mThumbIds[position], Toast.LENGTH_LONG).show(); 43             } 44          45          46         }); 47          48     } 49  50     public class ImageAdapter extends BaseAdapter{ 51  52         private Context mContext; 53         //聲明ImageAdapter 54         public ImageAdapter(Context context) 55         { 56             this.mContext=context; 57         } 58         //擷取圖片的個數 59         public int getCount() { 60             return mThumbIds.length; 61         } 62  63         //擷取圖片在庫中的位置 64         public Object getItem(int position) { 65             return mThumbIds[position]; 66         } 67  68         //擷取圖片在庫中的位置 69         public long getItemId(int position) { 70             return 0; 71         } 72  73         public View getView(int position, View convertView, ViewGroup parent) { 74              75             ImageView imageView; 76             if(convertView==null) 77             { 78                 imageView=new ImageView(mContext); 79                  imageView.setLayoutParams(new Gallery.LayoutParams(75, 75));   80                     imageView.setScaleType(ImageView.ScaleType.FIT_CENTER);   81                     imageView.setPadding(8, 8, 8, 8);   82                 } 83             else{   84                     imageView = (ImageView) convertView;   85                 }  86              87                 imageView.setImageResource(mThumbIds[position]);   88                 return imageView;   89         } 90          91     } 92      93     //展示圖片 94     private Integer[] mThumbIds={ 95             R.drawable.heart, 96             R.drawable.heart_broken, 97             R.drawable.heart_delete, 98             R.drawable.heart_preferences, 99             R.drawable.heart_edit,100             R.drawable.heart_new,101             R.drawable.star_red,102             R.drawable.meishi3,103             R.drawable.meishi4,104             R.drawable.meishi5,105     };106     public boolean onCreateOptionsMenu(Menu menu) {107         // Inflate the menu; this adds items to the action bar if it is present.108         getMenuInflater().inflate(R.menu.main, menu);109         return true;110     }111 112 }

這周就學到這點，期待下一次學習的進步...