Android 自定义系统菜单的背景源码-白红宇

Android 自定义系统菜单的背景源码

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发布时间：2019-06-21

本文共 3111 字，大约阅读时间需要 10 分钟。

Android 自定义系统菜单的背景源码

                    01           package lab.sodino.menutest;          
        
                    02           import          
        
                    03           android.content.Context;          
        
                    04           import android.app.Activity;          
        
                    05           import android.os.Bundle;          
        
                    06           import android.os.Handler;          
        
                    07           import android.util.AttributeSet;          
        
                    08           import android.view.InflateException;          
        
                    09           import android.view.LayoutInflater;          
        
                    10           import android.view.Menu;          
        
                    11           import android.view.MenuInflater;          
        
                    12           import android.view.MenuItem;          
        
                    13           import android.view.View;          
        
                    14           import android.widget.Toast;          
        
                    15           /**          
        
                    16           * @author Sodino E-mail:sodinoopen@hotmail.com          
        
                    17           * @version Time：2011-1-26 下午04:42:04          
        
                    18           */          
        
                    19           public class MenuAct extends Activity { 
          
                    20           @Override          
        
                    21           public void onCreate(Bundle savedInstanceState) { 
          
                    22           super.onCreate(savedInstanceState);          
        
                    23           setContentView(R.layout.main);          
        
                    24           }          
        
                    25           public boolean onCreateOptionsMenu(Menu menu) { 
          
                    26           super.onCreateOptionsMenu(menu);          
        
                    27           MenuInflater inflater = new MenuInflater(getApplicationContext());          
        
                    28           inflater.inflate(R.menu.menu, menu);          
        
                    29           setMenuBackground();          
        
                    30           return true;          
        
                    31           }          
        
                    32           public boolean onOptionsItemSelected(MenuItem item) { 
          
                    33           String info = "";          
        
                    34           switch (item.getItemId()) { 
          
                    35           case R.id.menu_add:          
        
                    36           info = "Add";          
        
                    37           break;          
        
                    38           case R.id.menu_delete:          
        
                    39           info = "Delete";          
        
                    40           break;          
        
                    41           case R.id.menu_home:          
        
                    42           info = "Home";          
        
                    43           break;          
        
                    44           case R.id.menu_help:          
        
                    45           info = "Help";          
        
                    46           break;          
        
                    47           default:          
        
                    48           info = "NULL";          
        
                    49           break;          
        
                    50           }          
        
                    51           Toast toast = Toast.makeText(this, info, Toast.LENGTH_SHORT);          
        
                    52           toast.show();          
        
                    53           return super.onOptionsItemSelected(item);          
        
                    54           }          
        
                    55           // 关键代码为重写Layout.Factory.onCreateView()方法自定义布局          
        
                    56           protected void setMenuBackground() { 
          
                    57           MenuAct.this.getLayoutInflater().setFactory(new android.view.LayoutInflater.Factory() { 
          
                    58           /**          
        
                    59           * name - Tag name to be inflated.<br/>          
        
                    60           * context - The context the view is being created in.<br/>          
        
                    61           * attrs - Inflation attributes as specified in XML file.<br/>          
        
                    62           */          
        
                    63           public View onCreateView(String name, Context context, AttributeSet attrs) { 
          
                    64           // 指定自定义inflate的对象          
        
                    65           if (name.equalsIgnoreCase("com.android.internal.view.menu.IconMenuItemView")) { 
          
                    66           try { 
          
                    67           LayoutInflater f = getLayoutInflater();          
        
                    68           final View view = f.createView(name, null, attrs);          
        
                    69           new Handler().post(new Runnable() { 
          
                    70           public void run() { 
          
                    71           // 设置背景图片          
        
                    72           view.setBackgroundResource(R.drawable.menu_background);          
        
                    73           }          
        
                    74           });          
        
                    75           return view;          
        
                    76           } catch (InflateException e) { 
          
                    77           e.printStackTrace();          
        
                    78           } catch (ClassNotFoundException e) { 
          
                    79           e.printStackTrace();          
        
                    80           }          
        
                    81           }          
        
                    82           return null;          
        
                    83           }          
        
                    84           });          
        
                    85           }          
        
                    86           }