自定义控件：抽屉SlidingDrawer——wrap_content非全屏

3 import android.content.Context;
  4 import android.util.AttributeSet;
  5 import android.view.View;
  6 import android.widget.SlidingDrawer;
  7 
  8 /**
  9  * 使得SlidingDrawer在屏幕低端，而不会填满整个屏幕
 10  */
 11 public class WrapSlidingDrawer extends SlidingDrawer {
 12     
 13     private boolean mVertical;
 14     private int mTopOffset;
 15 
 16     // 从指定的XML定义的属性集创建一个新的WrapSlidingDrawer。
 17     public WrapSlidingDrawer(Context context, AttributeSet attrs, int defStyle) {
 18         super(context, attrs, defStyle);
 19         /**
 20          * namespace     属性的命名空间来获取。 
 21          * attribute     属性检索。
 22          * defaultValue     如果未找到该属性返回什么。
 23          * 
 24          * ORIENTATION_VERTICAL:定向垂直。
 25          */
 26         int orientation = attrs.getAttributeIntValue("android", "orientation",
 27                 ORIENTATION_VERTICAL);
 28         // "topOffset" 额外偏移的把手在SlidingDrawer的顶部。
 29         mTopOffset = attrs.getAttributeIntValue("android", "topOffset", 0);
 30         mVertical = (orientation == SlidingDrawer.ORIENTATION_VERTICAL);
 31     }
 32 
 33     public WrapSlidingDrawer(Context context, AttributeSet attrs) {
 34         super(context, attrs);
 35         int orientation = attrs.getAttributeIntValue("android", "orientation",
 36                 ORIENTATION_VERTICAL);
 37         mTopOffset = attrs.getAttributeIntValue("android", "topOffset", 0);
 38         mVertical = (orientation == SlidingDrawer.ORIENTATION_VERTICAL);
 39     }
 40 
 41     /**
 42      * 测量视图和其内容，以确定所测量的宽度和所测量的高度。
 43      * widthMeasureSpec   宽度测量规格。
 44      * heightMeasureSpec  高度测量规格。
 45      */
 46     @Override  
 47     protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
 48         int widthSpecMode = MeasureSpec.getMode(widthMeasureSpec);
 49         int widthSpecSize = MeasureSpec.getSize(widthMeasureSpec);
 50         int heightSpecMode = MeasureSpec.getMode(heightMeasureSpec);
 51         int heightSpecSize = MeasureSpec.getSize(heightMeasureSpec);
 52         // 返回抽屉的手柄。 
 53         final View handle = getHandle();
 54         // 返回抽屉的内容。 
 55         final View content = getContent();
 56         /**
 57          * Ask one of the children of this view to measure itself, taking into
 58          * account both the MeasureSpec requirements for this view and its padding.
 59          * The heavy lifting is done in getChildMeasureSpec.
 60          *
 61          * @param child The child to measure
 62          * @param parentWidthMeasureSpec The width requirements for this view
 63          * @param parentHeightMeasureSpec The height requirements for this view
 64          */
 65         measureChild(handle, widthMeasureSpec, heightMeasureSpec);
 66 
 67         if (mVertical) {
 68             // 测量高度 - 抽屉手柄高度 - 额外偏移的把手顶部
 69             int height = heightSpecSize - handle.getMeasuredHeight()
 70                     - mTopOffset;
 71             // 内容尺寸
 72             // public static int makeMeasureSpec (int size, int mode)
 73             // Creates a measure specification based on the supplied size and mode.
 74             //   size    the size of the measure specification
 75             //   mode    the mode of the measure specification
 76             content.measure(widthMeasureSpec,
 77                     MeasureSpec.makeMeasureSpec(height, heightSpecMode));
 78             //
 79             heightSpecSize = handle.getMeasuredHeight() + mTopOffset
 80                     + content.getMeasuredHeight();
 81             //
 82             widthSpecSize = content.getMeasuredWidth();
 83             //
 84             if (handle.getMeasuredWidth() > widthSpecSize)
 85                 widthSpecSize = handle.getMeasuredWidth();
 86         } else {
 87             int width = widthSpecSize - handle.getMeasuredWidth() - mTopOffset;
 88             getContent().measure(
 89                     MeasureSpec.makeMeasureSpec(width, widthSpecMode),
 90                     heightMeasureSpec);
 91             widthSpecSize = handle.getMeasuredWidth() + mTopOffset
 92                     + content.getMeasuredWidth();
 93             heightSpecSize = content.getMeasuredHeight();
 94             if (handle.getMeasuredHeight() > heightSpecSize)
 95                 heightSpecSize = handle.getMeasuredHeight();
 96         }
 97         // 此方法必须由onMeasure（int，int）被调用储存的测量宽度和高度测量。
 98         setMeasuredDimension(widthSpecSize, heightSpecSize);
 99     }
100 }

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:layout_width="fill_parent"
 4     android:layout_height="fill_parent" >
 5 
 6     <TextView
 7         android:id="@+id/text_view"
 8         android:layout_width="fill_parent"
 9         android:layout_height="wrap_content"
10         android:layout_marginTop="10dip"
11         android:gravity="center"
12         android:text="AAAAAAAAAAAAAA"
13         android:textSize="10pt" />
14 
15     <com.cn.daming.WrapSlidingDrawer
16         android:id="@+id/sliding_drawer"
17         android:layout_width="fill_parent"
18         android:layout_height="wrap_content"
19         android:content="@+id/mycontent"
20         android:handle="@+id/layout1"
21         android:layout_alignParentBottom="true"
22         android:orientation="vertical" >
23 
24         <LinearLayout
25             android:id="@id/layout1"
26             android:layout_width="wrap_content"
27             android:layout_height="wrap_content"
28             android:background="#00000000"
29             android:gravity="center" >
30 
31             <ImageView
32                 android:id="@+id/my_image"
33                 android:layout_width="wrap_content"
34                 android:layout_height="wrap_content"
35                 android:src="@drawable/up1" />
36         </LinearLayout>
37 
38         <GridView
39             android:id="@id/mycontent"
40             android:layout_width="wrap_content"
41             android:layout_height="wrap_content"
42             android:background="#ff000000"
43             android:gravity="center"
44             android:numColumns="3"
45             android:paddingTop="20dip" />
46     </com.cn.daming.WrapSlidingDrawer>
47 
48 </RelativeLayout>

 3 import android.app.Activity;
 4 import android.content.res.Configuration;
 5 import android.os.Bundle;
 6 import android.view.View;
 7 import android.widget.GridView;
 8 import android.widget.ImageView;
 9 import android.widget.SlidingDrawer;
10 import android.widget.TextView;
11 
12 public class SlidingDrawerMainActivity extends Activity {
13 
14     private GridView gridView;
15     private SlidingDrawer slidingDrawer;
16     private ImageView imageView;
17     private TextView textview;
18     private int[] icons = { R.drawable.title1, R.drawable.title2,
19             R.drawable.title3, R.drawable.title4, R.drawable.title5,
20             R.drawable.title6 };
21 
22     private String[] items = { "Phone", "Message", "AddImage", "Music",
23             "Telephone", "SMS" };
24 
25     @Override
26     public void onCreate(Bundle savedInstanceState) {
27         super.onCreate(savedInstanceState);
28         
29         setContentView(R.layout.main);
30         
31         gridView = (GridView) findViewById(R.id.mycontent);
32         slidingDrawer = (SlidingDrawer) findViewById(R.id.sliding_drawer);
33         imageView = (ImageView) findViewById(R.id.my_image);
34         textview = (TextView) findViewById(R.id.text_view);
35         MyGridViewAdapter adapter = new MyGridViewAdapter(this, items, icons);
36         gridView.setAdapter(adapter);
37         
38         slidingDrawer
39                 .setOnDrawerOpenListener(new SlidingDrawer.OnDrawerOpenListener() {
40 
41                     public void onDrawerOpened() {
42                         textview.setVisibility(View.GONE);
43                         imageView.setImageResource(R.drawable.down1);
44                     }
45                 });
46         slidingDrawer
47                 .setOnDrawerCloseListener(new SlidingDrawer.OnDrawerCloseListener() {
48 
49                     public void onDrawerClosed() {
50                         textview.setVisibility(View.VISIBLE);
51                         imageView.setImageResource(R.drawable.up1);
52                     }
53                 });
54     }
55 
56     @Override
57     public void onConfigurationChanged(Configuration newConfig) {
58         super.onConfigurationChanged(newConfig);
59     }
60 }