Android编程实现自定义系统菜单背景的方法

package lab.sodino.menutest;
import android.content.Context;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.util.AttributeSet;
import android.view.InflateException;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.Toast;
/**
 * @author Sodino E-mail:sodinoopen@hotmail.com
 * @version Time：2011-1-26 下午04:42:04
 */
public class MenuAct extends Activity {
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
  }
  public boolean onCreateOptionsMenu(Menu menu) {
    super.onCreateOptionsMenu(menu);
    MenuInflater inflater = new MenuInflater(getApplicationContext());
    inflater.inflate(R.menu.menu, menu);
    setMenuBackground();
    return true;
  }
  public boolean onOptionsItemSelected(MenuItem item) {
    String info = "";
    switch (item.getItemId()) {
    case R.id.menu_add:
      info = "Add";
      break;
    case R.id.menu_delete:
      info = "Delete";
      break;
    case R.id.menu_home:
      info = "Home";
      break;
    case R.id.menu_help:
      info = "Help";
      break;
    default:
      info = "NULL";
      break;
    }
    Toast toast = Toast.makeText(this, info, Toast.LENGTH_SHORT);
    toast.show();
    return super.onOptionsItemSelected(item);
  }
  // 关键代码为重写Layout.Factory.onCreateView()方法自定义布局
  protected void setMenuBackground() {
    MenuAct.this.getLayoutInflater().setFactory(new android.view.LayoutInflater.Factory() {
      /**
       * name - Tag name to be inflated.

       * context - The context the view is being created in.

       * attrs - Inflation attributes as specified in XML file.

       */
      public View onCreateView(String name, Context context, AttributeSet attrs) {
        // 指定自定义inflate的对象
        if (name.equalsIgnoreCase("com.android.internal.view.menu.IconMenuItemView")) {
          try {
            LayoutInflater f = getLayoutInflater();
            final View view = f.createView(name, null, attrs);
            new Handler().post(new Runnable() {
              public void run() {
                // 设置背景图片
                view.setBackgroundResource(R.drawable.menu_background);
              }
            });
            return view;
          } catch (InflateException e) {
            e.printStackTrace();
          } catch (ClassNotFoundException e) {
            e.printStackTrace();
          }
        }
        return null;
      }
    });
  }
}

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