Android Menu半透明效果的开发实例

不知道大家是否用过天天动听，对于它界面上的半透明menu效果，笔者感觉非常漂亮。下面是天天动听半透明menu的截图，欣赏下吧：

       感觉还不错吧？那么如何实现这种半透明menu效果呢？本文就重点讨论并给出这种menu的具体代码实现过程。

       首先分析下实现这种半透明menu所需做的工作，并进行合理分解：

       1.  利用shaper设置一个半透明圆角背景。

       2.  定义menu布局，主要就gridview，把图标都放在这个gridview。

       3.  menu事件, 通过popupwindow或者alertdialog或者透明activity显示到页面即可。

       4.  按钮的监听事件，实例中没加。需要的话自己在adapter里加。

       比较简单，不多说了。

       半透明圆角背景xml：

xml/html代码

<?xml version="1.0" encoding="utf-8"?> 
 
<shape android:shape="rectangle">  
 
 <solid android:color="#b4000000" /> 
 
 <stroke android:width="2.0dip" android:color="#b4ffffff" android:dashwidth="3.0dip" android:dashgap="0.0dip" /> 
 
 <padding android:left="7.0dip" android:top="7.0dip" android:right="7.0dip" android:bottom="7.0dip" /> 
 
 <corners android:radius="8.0dip" /> 
 
</shape> 

        menu布局：

xml/html代码

<?xml version="1.0" encoding="utf-8"?> 
 
<linearlayout 
 
  android:orientation="vertical" 
 
  android:layout_width="wrap_content" 
 
  android:layout_height="fill_parent"> 
  
 
  <gridview android:gravity="center" 
 
    android:layout_gravity="center" 
 
    android:id="@+id/menugridchange" 
    
    android:background="@drawable/menu_bg_frame" 
 
    android:padding="5.0dip" 
 
    android:layout_width="fill_parent" 
 
    android:layout_height="wrap_content" 
 
    android:horizontalspacing="10.0dip" 
 
    android:verticalspacing="3.0dip" 
 
    android:stretchmode="columnwidth" 
 
    android:columnwidth="60.0dip" 
 
    android:numcolumns="auto_fit"/> 
 
     
</linearlayout> 

       主要类：

java代码

package com.yfz; 
 
 
import android.app.activity; 
import android.app.alertdialog; 
import android.app.alertdialog.builder; 
import android.content.context; 
import android.graphics.drawable.bitmapdrawable; 
import android.os.bundle; 
import android.util.log; 
import android.view.contextmenu; 
import android.view.gravity; 
import android.view.layoutinflater; 
import android.view.menu; 
import android.view.menuitem; 
import android.view.view; 
import android.view.viewgroup; 
import android.view.contextmenu.contextmenuinfo; 
import android.widget.baseadapter; 
import android.widget.gridview; 
import android.widget.imageview; 
import android.widget.linearlayout; 
import android.widget.popupwindow; 
import android.widget.textview; 
import android.widget.linearlayout.layoutparams; 
 
public class menutest extends activity {   
 
  private string tag = this.getclass().getsimplename();   
 
  private int[] resarray = new int[] { 
    r.drawable.icon_menu_addto, r.drawable.icon_menu_audioinfo, 
    r.drawable.icon_menu_findlrc, r.drawable.icon_menu_scan 
  };   
 
  private string[] title = new string[]{ 
    "添加歌曲", "歌曲信息", "查找歌词", "搜索歌词" 
  };   
 
  private static boolean show_flag = false;   
  private popupwindow pw = null;   
 
  /** called when the activity is first created. */ 
  @override 
  public void oncreate(bundle savedinstancestate) { 
   super.oncreate(savedinstancestate); 
   setcontentview(r.layout.main); 
  } 
 
  @override 
 
  public boolean oncreateoptionsmenu(menu menu) { 
    log.e(tag, "------ oncreateoptionsmenu ------"); 
    //用alertdialog弹出menu 
 
//    view view = layoutinflater.from(this).inflate(r.layout.menu, null); 
 
//    gridview grid1 = (gridview)view.findviewbyid(r.id.menugridchange); 
 
//    grid1.setadapter(new imageadapter(this)); 
 
//    builder build = new alertdialog.builder(this); 
 
//    build.setview(view); 
 
//    build.show(); 
     
    layoutinflater inflater = (layoutinflater)this.getsystemservice(context.layout_inflater_service);   
 
    view view = inflater.inflate(r.layout.menu, null); 
 
    gridview grid1 = (gridview)view.findviewbyid(r.id.menugridchange); 
 
    grid1.setadapter(new imageadapter(this));     
 
    //用popupwindow弹出menu 
    pw = new popupwindow(view,layoutparams.fill_parent, layoutparams.wrap_content);     
 
    //nnd, 第一个参数， 必须找个view 
    pw.showatlocation(findviewbyid(r.id.tv), gravity.center, 0, 300);     
 
    return true; 
  } 
 
  @override 
 
  public boolean onoptionsitemselected(menuitem item) { 
    return super.onoptionsitemselected(item); 
  } 
 
  public class imageadapter extends baseadapter {     
    private context context;     
 
    public imageadapter(context context) { 
      this.context = context; 
    }     
 
    @override 
    public int getcount() { 
      return resarray.length; 
    } 
 
    @override 
    public object getitem(int arg0) { 
      return resarray[arg0]; 
    } 
 
    @override 
    public long getitemid(int arg0) { 
      return arg0; 
    } 
 
    @override 
    public view getview(int arg0, view arg1, viewgroup arg2) { 
      linearlayout linear = new linearlayout(context); 
 
      linearlayout.layoutparams params = new layoutparams(layoutparams.wrap_content, layoutparams.wrap_content); 
 
      linear.setorientation(linearlayout.vertical);       
 
      imageview iv = new imageview(context); 
 
      iv.setimagebitmap(((bitmapdrawable)context.getresources().getdrawable(resarray[arg0])).getbitmap()); 
 
      linearlayout.layoutparams params2 = new layoutparams(layoutparams.wrap_content, layoutparams.wrap_content); 
 
      params2.gravity=gravity.center; 
 
      linear.addview(iv, params2);       
 
      textview tv = new textview(context); 
 
      tv.settext(title[arg0]); 
 
      linearlayout.layoutparams params3 = new layoutparams(layoutparams.wrap_content, layoutparams.wrap_content); 
 
      params3.gravity=gravity.center;       
 
      linear.addview(tv, params3);       
      return linear; 
    } 
  } 
} 

        到此，大家是不是觉得半透明menu效果也是比较好实现的呢？可以根据自己的需要对此实例进行修改以求更美观好用。

        以上就是对android menu 半透明效果的实现，后续继续补充相关资料谢谢大家对本站的支持！