android开发--drawerlayout(v4)

android左侧菜单栏的实现效果:

效果有以下几点:
(1)可以从左边界向右滑动,可以拖出菜单栏
(2)点击左上角的的icon图标显示菜单栏
(3)actionbar跟随菜单栏出现做出变化
(4)选择菜单栏的item可以切换主界面的fragment

代码过程:
1.,定义drawerlayout.
drawerLayout其实是一个布局控件，跟LinearLayout等控件是一种东西，但是drawerLayout带有滑动的功能。只要按照drawerLayout的规定布局方式写完布局，就能有侧滑的效果;drawerLayout分为侧边菜单和主内容区两部分，侧边菜单可以根据手势展开与隐藏（drawerLayout自身特性），主内容区的内容可以随着菜单的点击而变化（这需要使用者自己实现）
activity_main.xml:

<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:id="@+id/drawerlayout"    android:layout_width="match_parent"    android:layout_height="match_parent" >    <FrameLayout        android:id="@+id/contentfragment"        android:layout_width="match_parent"        android:layout_height="match_parent" />    <ListView        android:id="@+id/lv"        android:layout_width="240dp"        android:layout_height="match_parent"        android:layout_gravity="start"        android:background="#fff000"        android:choiceMode="singleChoice"        /></android.support.v4.widget.DrawerLayout>

fragmentlayout用来显示主内内容区,listview布局菜单栏

2.fragment的布局文件与类实现
layout_mfragment.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:id="@+id/tv"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_gravity="center_horizontal"        /></LinearLayout>

Myfragment.java:

package com.min.drawerlayout;import org.w3c.dom.Text;import android.app.Fragment;import android.os.Bundle;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.TextView;public class MyFragment extends Fragment{    @Override    public View onCreateView(LayoutInflater inflater, ViewGroup container,            Bundle savedInstanceState) {        View view=inflater.inflate(R.layout.layout_mfragment,container,false);        TextView textView=(TextView) view.findViewById(R.id.tv);        String text=(String) getArguments().get("text");        textView.setText(text);        return view;    }}

3.listview菜单栏实现与响应:

package com.min.drawerlayout;import java.util.ArrayList;import android.app.ActionBar;import android.app.Activity;import android.app.FragmentManager;import android.app.FragmentTransaction;import android.os.Bundle;import android.support.v4.app.ActionBarDrawerToggle;import android.support.v4.widget.DrawerLayout;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.ArrayAdapter;import android.widget.ListView;public class MainActivity extends Activity {    private ArrayList<String> strings;    private ListView listView;    private DrawerLayout mDrawerLayout;    private String title;    private ActionBarDrawerToggle mDrawerToggle;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        //定义字符串strings        strings = new ArrayList<String>();        for (int i = 0; i < 5; i++) {            strings.add("list" + i);        }        // 初始化左侧导航栏        ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(this,                android.R.layout.simple_list_item_1, strings);        listView = (ListView) findViewById(R.id.lv);        mDrawerLayout = (DrawerLayout) findViewById(R.id.drawerlayout);        //获取actionbar的title        title = (String) getTitle();        //左侧菜单栏设置适配器        listView.setAdapter(arrayAdapter);        //左侧菜单栏响应        listView.setOnItemClickListener(new OnItemClickListener() {            @Override            public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,                    long arg3) {                MyFragment mFragment = new MyFragment();                Bundle bundle = new Bundle();                bundle.putString("text", "fragment" + arg2);                mFragment.setArguments(bundle);                FragmentManager fragmentManager = getFragmentManager();                FragmentTransaction fragmentTransaction = fragmentManager                        .beginTransaction();                fragmentTransaction.replace(R.id.contentfragment, mFragment,                        null).commit();                mDrawerLayout.closeDrawers();            }        });        //actionbardrawertoggle对象,1:上下文,2:drawerlayout对象,3:drawer图标,4:打开文本描述资源,5关闭文本描述资源        mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout,                R.drawable.logo_plus, R.string.open, R.string.close) {            @Override            public void onDrawerOpened(View drawerView) {                super.onDrawerOpened(drawerView);                getActionBar().setTitle("请选择");                //这个函数会调用onPrepareOptionsMenu()                invalidateOptionsMenu();            }            @Override            public void onDrawerClosed(View drawerView) {                super.onDrawerClosed(drawerView);                getActionBar().setTitle(title);                invalidateOptionsMenu();            }        };        mDrawerLayout.setDrawerListener(mDrawerToggle);        ActionBar actionBar = getActionBar();        actionBar.setDisplayHomeAsUpEnabled(true);    }    @Override    //调用ActionBarDrawerToggle.syncState() 在Activity的onPostCreate()中；    //指示，ActionBarDrawerToggle与DrawerLayout的状态同步，    //并将ActionBarDrawerToggle中的drawer图标，设置为ActionBar的Home-Button的icon    protected void onPostCreate(Bundle savedInstanceState) {        // TODO Auto-generated method stub        super.onPostCreate(savedInstanceState);        mDrawerToggle.syncState();    }    @Override    //当左侧菜单栏打开,actionbar上的右侧图标不显示,不打开则显示    public boolean onPrepareOptionsMenu(Menu menu) {        boolean isopen = mDrawerLayout.isDrawerOpen(listView);        menu.findItem(R.id.action_search).setVisible(!isopen);        return super.onPrepareOptionsMenu(menu);    }    @Override    public boolean onCreateOptionsMenu(Menu menu) {        getMenuInflater().inflate(R.menu.main, menu);        return true;    }    @Override    public boolean onOptionsItemSelected(MenuItem item) {        if (mDrawerToggle.onOptionsItemSelected(item)) {            return true;        }        return super.onOptionsItemSelected(item);    }}

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