来源: 互联网  发布时间: 2014-02-18

ExpandableListView替换系统默认的箭头 .

很多朋友可能在android开发中，用过ExpandableListView这个组件，这个组件功能强大，比传统的ListView有好多优势。然而在开发中，我相信有好多人，包括我个人都会遇到下面的一些问题：

1。如何替换ExpandableListView的默认箭头

解决方法：在配置文件中有个android:groupIndicator属性，

例如:android:groupIndicator="@drawable/lt_expandablelistviewselector"

<?xml version="1.0" encoding="utf-8"?>   
<selector xmlns:android="http://schemas.android.com/apk/res/android">   
    <item android:state_expanded="true" android:drawable="@drawable/lt_open" />   
    <item android:drawable="@drawable/lt_norm" />   
</selector> 

 

lt_open和lt_norm分别是两张不同状态的图片:

 

 

<ExpandableListView
android:divider="@drawable/lt_listview_line"
android:childDivider="@drawable/lt_listview_line"   
android:cacheColorHint="#f5f5f5"
android:background="#f5f5f5"
android:id="@+id/citylist"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:listSelector="@drawable/lt_imglistselector"
android:groupIndicator="@drawable/lt_expandablelistviewselector"
/>

 
具体你要加载哪些数据，和哪些内容显示在ExpandableListView上，自由发挥吧.

    

    来源: 互联网  发布时间: 2014-02-18

在XIB里设置 navigation bar 在模拟器里确没有显示
MainViewController *mainViewController = [[[MainViewController alloc] init] autorelease];
    UINavigationController *navController = [[[UINavigationController alloc] initWithRootViewController:mainViewController] autorelease];
   
    [self.window addSubview:navController.view];


是因为没有加UINavigationController

    

    来源: 互联网  发布时间: 2014-02-18

【转】修改menu样式－背景等

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.<br/>
			 * context - The context the view is being created in.<br/>
			 * attrs - Inflation attributes as specified in XML file.<br/>
			 */
			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;
			}
		});
	}
}