应用场景:
由于侧滑菜单有更好的用户体验效果,所以更多的App使用侧滑抽屉式菜单列表,如网易客户端、百度影音、爱奇艺等等。至此,侧滑菜单有了更多的使用需求。
知识点介绍:
实现侧滑菜单功能的方法有很多,如果开源的项目SlidingMenu,下载地址为https://github.com/jfeinstein10/SlidingMenu。该开源项目依赖于另一个开源项目ActionBarSherlock,下载地址为https://github.com/JakeWharton/ActionBarSherlock。这种实现方式,读者可以平时有时间自行研究一下。本例主要介绍android-support-v4.jar提供的支持,android.support.v4.widget.DrawerLayout,可兼容低版本的系统。
使用方式:
第一步:新建测试项目DrawerLayout。
第二步:编写相关的布局文件,主界面布局文件activity_main.xml。
第二步:编写相关的布局文件,主界面布局文件activity_main.xml。
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" tools:context=".MainActivity" > <android.support.v4.widget.DrawerLayout android:id="@+id/drawer_layout" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@android:color/white" > <FrameLayout android:id="@+id/fragment_layout" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@android:color/white" > <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:gravity="center" android:text="主内容界面" /> </FrameLayout> <!-- android:layout_gravity="start" 侧滑菜单在左边 android:layout_gravity="start" 侧滑菜单在右边 --> <LinearLayout android:id="@+id/menu_layout" android:layout_width="180dp" android:layout_height="match_parent" android:layout_gravity="start" android:background="@android:color/white" android:orientation="vertical" > <ImageView android:layout_width="match_parent" android:layout_height="wrap_content" android:gravity="center" android:src="@drawable/ic_launcher" /> <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:gravity="center" android:text="侧拉菜单" android:textColor="@android:color/black" /> <!-- android:cacheColorHint="#FFFFFF" 解决Android ListView 滚动 Item 背景变黑的问题 --> <ListView android:id="@+id/menu_listView" android:layout_width="match_parent" android:layout_height="match_parent" android:cacheColorHint="#FFFFFF" > </ListView> </LinearLayout> </android.support.v4.widget.DrawerLayout> </LinearLayout>Fragment类的布局文件layout_first.xml,layout_next.xml。
【layout_first.xml】
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <TextView android:layout_width="match_parent" android:layout_height="20dp" android:text="FirstFragment" android:id="@+id/textTextView"/> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical"> <ListView android:layout_height="wrap_content" android:layout_width="wrap_content" android:cacheColorHint="#FFFFFF" android:id="@+id/firstFragmentListView"> </ListView> </LinearLayout> </LinearLayout>
【layout_next.xml】
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <TextView android:layout_height="wrap_content" android:layout_width="match_parent" android:text="NextFragment"/> </LinearLayout>
ListView的ListItem的布局文件main_listitem.xml。
【main_listitem.xml】
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <TextView android:layout_width="match_parent" android:layout_height="40dp" android:id="@+id/menu" android:textSize="20dp" android:gravity="center_vertical" android:text="加载中..."/> </LinearLayout>第二步:编写相关的java文件,FirstFragment.java、NextFragment、MainActivity.java、MenuListViewAdapter.java、DataBuiltUtils.java。
【FirstFragment.java】
import android.os.Bundle; import android.support.v4.app.Fragment; import android.view.LayoutInflater; import android.view.View; import android.view.View.OnClickListener; import android.view.ViewGroup; import android.widget.ListView; import android.widget.TextView; import android.widget.Toast; public class FirstFragment extends Fragment{ private TextView textView; private ListView listView; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View layout = inflater.inflate(R.layout.layout_first, null); textView = (TextView) layout.findViewById(R.id.textTextView); textView.setOnClickListener(new OnClickListener() { @Override public void onClick(View arg0) { Toast.makeText(getActivity(), "FirstFragment", Toast.LENGTH_SHORT).show(); } }); listView = (ListView) layout.findViewById(R.id.firstFragmentListView); MenuListViewAdapter adapter = new MenuListViewAdapter(getActivity(), DataBuiltUtils.getFirstMapList()); listView.setAdapter(adapter); return layout; } }【NextFragment.java】
import android.os.Bundle; import android.support.v4.app.Fragment; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; public class NextFragment extends Fragment{ @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){ View layout = inflater.inflate(R.layout.layout_next, null); return layout; } }
【MainActivity.java】
import java.util.ArrayList; import java.util.HashMap; import android.os.Bundle; import android.app.Activity; import android.content.Context; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentActivity; import android.support.v4.app.FragmentTransaction; import android.support.v4.widget.DrawerLayout; import android.view.Menu; import android.view.View; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.LinearLayout; import android.widget.ListView; import android.widget.RelativeLayout; import android.widget.AdapterView.OnItemClickListener; /** * 抽屉效果 * DrawerLayout与Fragment的联用 * DrawerLayout相关: * 1.一般内容层使用framelayout * 2.slidingLayout需要设置一个layout_grative属性 * 文档建议使用android:layout_gravity="start" */ public class MainActivity extends FragmentActivity{ private DrawerLayout mDrawer_layout; //抽屉式布局 private LinearLayout mMenu_layout; @Override protected void onCreate(Bundle savedInstanceState){ super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mDrawer_layout = (DrawerLayout) findViewById(R.id.drawer_layout); mMenu_layout = (LinearLayout) findViewById(R.id.menu_layout); ListView menu_listview = (ListView) mMenu_layout.findViewById(R.id.menu_listView); ArrayList<HashMap<String, String>> tempMapList = DataBuiltUtils.getMainMapList(); menu_listview.setAdapter(new MenuListViewAdapter( getApplicationContext(), tempMapList)); //菜单ListView设置监听事件 menu_listview.setOnItemClickListener(new DrawerItemClickListener()); } public class DrawerItemClickListener implements OnItemClickListener { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id){ FragmentTransaction ft = getSupportFragmentManager().beginTransaction(); Fragment fragment = null; //根据item点击行号判断启用指定Fragment switch (position){ case 0: fragment = new FirstFragment(); break; case 1: fragment = new NextFragment(); break; default: fragment = new FirstFragment(); break; } ft.replace(R.id.fragment_layout, fragment); ft.commit(); mDrawer_layout.closeDrawer(mMenu_layout);//点击后关闭mMenu_layout } } }
【MenuListViewAdapter.java】
import java.util.HashMap; import java.util.List; import java.util.Map; import android.content.Context; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.TextView; public class MenuListViewAdapter extends BaseAdapter { private List<HashMap<String, String>> lists; private LayoutInflater mInflater; private Context mainContext; public MenuListViewAdapter(Context context, List<HashMap<String, String>> dataList) { mInflater = LayoutInflater.from(context); mainContext = context; lists = dataList; } @Override public int getCount() { return lists.size(); } @Override public Object getItem(int position) { return lists.get(position); } @Override public long getItemId(int position) { return position; } @Override public View getView(final int position, View convertView, ViewGroup parent) { ViewHolder holder = null; if (convertView == null) { holder = new ViewHolder(); convertView = mInflater.inflate(R.layout.main_listitem, null); holder.menu = (TextView) convertView.findViewById(R.id.menu); convertView.setTag(holder); } else { holder = (ViewHolder) convertView.getTag(); } // 设置背景色 // if(position%2==1){ // convertView.setBackgroundColor(Color.rgb(220, 220, 220)); // }else { // convertView.setBackgroundColor(Color.rgb(255, 250, 250)); // } if (lists.size() > 0) { final Map<String, String> map = lists.get(position); String number = (String) map.get("menu"); holder.menu.setText(number); } return convertView; } static class ViewHolder { TextView menu; //菜单名称 } }【DataBuiltUtils.java】
import java.util.ArrayList; import java.util.HashMap; public class DataBuiltUtils { public static ArrayList<HashMap<String,String>> getMainMapList(){ ArrayList<HashMap<String, String>> tempMapList = new ArrayList<HashMap<String,String>>(); for(int i=0;i<5;i++){ HashMap<String, String> tempMap = new HashMap<String, String>(); tempMap.put("menu", "菜单【"+(i+1)+"】"); tempMapList.add(tempMap); } return tempMapList; } public static ArrayList<HashMap<String,String>> getFirstMapList(){ ArrayList<HashMap<String, String>> tempMapList = new ArrayList<HashMap<String,String>>(); for(int i=0;i<5;i++){ HashMap<String, String> tempMap = new HashMap<String, String>(); tempMap.put("menu", "FirstFragment菜单【"+(i+1)+"】"); tempMapList.add(tempMap); } return tempMapList; } }