转自http://blog.csdn.net/wangkuifeng0118/article/details/7944215

书架效果：

　　下面先看一下书架的实现原理吧！

　　首先看一下layout下的布局文件main.xml

 <?xml version="1.0" encoding="utf-8"?>

 <RelativeLayout

     xmlns:android="http://schemas.android.com/apk/res/android"

     android:orientation="vertical"

     android:layout_width="fill_parent"

     android:layout_height="fill_parent"

 >

 <include layout="@layout/head" android:id="@+id/head"/>

     <cn.com.karl.view.MyGridView

         android:id="@+id/bookShelf"

         android:layout_width="fill_parent"

         android:layout_height="fill_parent"

         android:layout_below="@id/head"

         android:cacheColorHint="#00000000"

         android:columnWidth="90.0dip"

         android:fadingEdge="none"

         android:horizontalSpacing="5dp"

         android:listSelector="#00000000"

         android:numColumns="3"

         android:scrollbars="none"

         android:verticalSpacing="20dp" />

    <SlidingDrawer

         android:id="@+id/sliding"

         android:layout_width="match_parent"

         android:layout_height="match_parent"

         android:content="@+id/allApps"

         android:handle="@+id/imageViewIcon"

         android:orientation="vertical" >  

         <Button

             android:id="@+id/imageViewIcon"

             android:layout_width="wrap_content"

             android:layout_height="wrap_content"

             android:text="本地"

             android:textSize="18dp"

             android:background="@drawable/btn_local" /> 

         <GridView

             android:id="@+id/allApps"

             android:layout_width="wrap_content"

             android:layout_height="wrap_content"

             android:background="@drawable/file_list_bg"

             android:columnWidth="60dp"

             android:gravity="center"

             android:horizontalSpacing="10dp"

             android:numColumns="auto_fit"

             android:padding="10dp"

             android:stretchMode="columnWidth"

             android:verticalSpacing="10dp" />  

     </SlidingDrawer>  

 </RelativeLayout>

　　上面是个自定义的gridview主要来实现书架，因为每一本书是一个item，在自定义的gridview中计算每一行的高度，然后把书架画上去。下面是个抽屉。

 public class MyGridView extends GridView {

     private Bitmap background;

     public MyGridView(Context context, AttributeSet attrs) {

         super(context, attrs);

         background = BitmapFactory.decodeResource(getResources(),

                 R.drawable.bookshelf_layer_center);

     }

     @Override

     protected void dispatchDraw(Canvas canvas) {

         int count = getChildCount();

         int top = count > 0 ? getChildAt(0).getTop() : 0;

         int backgroundWidth = background.getWidth();

         int backgroundHeight = background.getHeight()+2;

         int width = getWidth();

         int height = getHeight();

         for (int y = top; y < height; y += backgroundHeight) {

             for (int x = 0; x < width; x += backgroundWidth) {

                 canvas.drawBitmap(background, x, y, null);

             }

         }

         super.dispatchDraw(canvas);

     }

 }

　　上面就是自定义书架的gridview，也是实现书架最核心的方法。

　　然后是每一个item的布局：

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    android:gravity="center"

    android:orientation="vertical" >

    <TextView

    android:layout_height="110dp"

    android:layout_width="90dp"

    android:layout_marginTop="10dp"

    android:background="@drawable/cover_txt"

    android:id="@+id/imageView1"

    android:text="天龙八部"

    android:padding="15dp"

    android:textColor="#000000"

    />

</LinearLayout>

　　最后就可以在主activity中显示出来了。

 public class BookShelfActivity extends BaseActivity {

     private GridView bookShelf;

     private int[] data = {

             R.drawable.cover_txt,R.drawable.cover_txt,R.drawable.cover_txt,R.drawable.cover_txt,R.drawable.cover_txt,

             R.drawable.cover_txt,R.drawable.cover_txt,R.drawable.cover_txt,R.drawable.cover_txt,R.drawable.cover_txt,

             R.drawable.cover_txt,R.drawable.cover_txt,R.drawable.cover_txt,R.drawable.cover_txt,

             R.drawable.cover_txt,R.drawable.cover_txt,R.drawable.cover_txt,R.drawable.cover_txt,

             R.drawable.cover_txt,R.drawable.cover_txt,R.drawable.cover_txt,R.drawable.cover_txt,

             R.drawable.cover_txt,R.drawable.cover_txt,R.drawable.cover_txt,R.drawable.cover_txt,

             R.drawable.cover_txt,R.drawable.cover_txt,R.drawable.cover_txt,R.drawable.cover_txt,

             R.drawable.cover_txt,R.drawable.cover_txt,R.drawable.cover_txt,R.drawable.cover_txt

     };

     private String[] name={

             "天龙八部","搜神记","水浒传","黑道悲情"

     };

     private GridView gv;

     private SlidingDrawer sd;

     private Button iv;

     private List<ResolveInfo> apps;  

     /** Called when the activity is first created. */

     @Override

     public void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         this.requestWindowFeature(Window.FEATURE_NO_TITLE);

         setContentView(R.layout.main);

         bookShelf = (GridView) findViewById(R.id.bookShelf);

         ShlefAdapter adapter=new ShlefAdapter();

         bookShelf.setAdapter(adapter);

         bookShelf.setOnItemClickListener(new OnItemClickListener() {

             @Override

             public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,

                     long arg3) {

                 // TODO Auto-generated method stub

                 if(arg2>=data.length){

                 }else{

                    Toast.makeText(getApplicationContext(), ""+arg2, Toast.LENGTH_SHORT).show();

                 }

             }

         });

         loadApps();

         gv = (GridView) findViewById(R.id.allApps);

         sd = (SlidingDrawer) findViewById(R.id.sliding);

         iv = (Button) findViewById(R.id.imageViewIcon);

         gv.setAdapter(new GridAdapter());

         sd.setOnDrawerOpenListener(new SlidingDrawer.OnDrawerOpenListener()// 开抽屉

         {

             @Override

             public void onDrawerOpened() {

                 iv.setText("返回");

                 iv.setBackgroundResource(R.drawable.btn_local);// 响应开抽屉事件

                                                                 // ，把图片设为向下的

             }

         });

         sd.setOnDrawerCloseListener(new SlidingDrawer.OnDrawerCloseListener() {

             @Override

             public void onDrawerClosed() {

                 iv.setText("本地");

                 iv.setBackgroundResource(R.drawable.btn_local);// 响应关抽屉事件

             }

         });

     }

     class ShlefAdapter extends BaseAdapter{

         @Override

         public int getCount() {

             // TODO Auto-generated method stub

             return data.length+5;

         }

         @Override

         public Object getItem(int arg0) {

             // TODO Auto-generated method stub

             return arg0;

         }

         @Override

         public long getItemId(int arg0) {

             // TODO Auto-generated method stub

             return arg0;

         }

         @Override

         public View getView(int position, View contentView, ViewGroup arg2) {

             // TODO Auto-generated method stub

             contentView=LayoutInflater.from(getApplicationContext()).inflate(R.layout.item1, null);

             TextView view=(TextView) contentView.findViewById(R.id.imageView1);

             if(data.length>position){

                 if(position<name.length){

                    view.setText(name[position]);

                 }

                 view.setBackgroundResource(data[position]);

             }else{

                 view.setBackgroundResource(data[0]);

                 view.setClickable(false);

                 view.setVisibility(View.INVISIBLE);

             }

             return contentView;

         }

     }

     @Override

     public boolean onKeyDown(int keyCode, KeyEvent event) {

         // TODO Auto-generated method stub

         if (keyCode == KeyEvent.KEYCODE_BACK) {

             AlertDialog.Builder builder = new AlertDialog.Builder(this);

             builder.setMessage("你确定退出吗？")

                     .setCancelable(false)

                     .setPositiveButton("确定",

                             new DialogInterface.OnClickListener() {

                                 public void onClick(DialogInterface dialog,

                                         int id) {

                                     finish();

                                 }

                             })

                     .setNegativeButton("返回",

                             new DialogInterface.OnClickListener() {

                                 public void onClick(DialogInterface dialog,

                                         int id) {

                                     dialog.cancel();

                                 }

                             });

             AlertDialog alert = builder.create();

             alert.show();

             return true;

         }

         return super.onKeyDown(keyCode, event);

     }

     private void loadApps() {

         Intent intent = new Intent(Intent.ACTION_MAIN, null);

         intent.addCategory(Intent.CATEGORY_LAUNCHER);  

         apps = getPackageManager().queryIntentActivities(intent, 0);

     }  

     public class GridAdapter extends BaseAdapter {

         public GridAdapter() {  

         }  

         public int getCount() {

             // TODO Auto-generated method stub

             return apps.size();

         }  

         public Object getItem(int position) {

             // TODO Auto-generated method stub

             return apps.get(position);

         }  

         public long getItemId(int position) {

             // TODO Auto-generated method stub

             return position;

         }  

         public View getView(int position, View convertView, ViewGroup parent) {

             // TODO Auto-generated method stub

             ImageView imageView = null;

             if (convertView == null) {

                 imageView = new ImageView(BookShelfActivity.this);

                 imageView.setScaleType(ImageView.ScaleType.FIT_CENTER);

                 imageView.setLayoutParams(new GridView.LayoutParams(50, 50));

             } else {

                 imageView = (ImageView) convertView;

             }  

             ResolveInfo ri = apps.get(position);

             imageView.setImageDrawable(ri.activityInfo

                     .loadIcon(getPackageManager()));  

             return imageView;

         }  

     }  

 }

源码下载：http://download.csdn.net/detail/wangkuifeng0118/4548542

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