Android(安卓)DrawerLayout实现抽屉效果

官网：https://developer.android.com/training/implementing-navigation/nav-drawer.html

贴上主要的逻辑和布局文件：

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>

这里需要注意一下：content主界面一定要定义在drawer的前面，另外，android:layout_gravity="start"（从左往右）或者android:layout_gravity="end"（从右往左），这个属性是必须要定义的，不然出现下面的异常：

MainActivity.java

package com.jackie.drawerlayoutdemo;import android.os.Bundle;import android.support.v4.widget.DrawerLayout;import android.support.v7.app.AppCompatActivity;import android.view.View;import android.widget.AdapterView;import android.widget.ArrayAdapter;import android.widget.ListView;import android.widget.TextView;public class MainActivity extends AppCompatActivity {    private String mTitle;    private DrawerLayout mDrawerLayout;    private ListView mDrawerMenu;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initView();        initData();        //默认打开抽屉        mDrawerLayout.openDrawer(mDrawerMenu);    }    private void initView() {        mTitle = getResources().getString(R.string.app_name);        mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);        mDrawerMenu = (ListView) findViewById(R.id.drawer_menu);    }    private void initData() {        //数组定义在xml 文件中        String[] items = getResources().getStringArray(R.array.left_drawer_items);        ArrayAdapter adapter = new ArrayAdapter<>(this, android.R.layout.simple_expandable_list_item_1);        adapter.addAll(items);        mDrawerMenu.setAdapter(adapter);        mDrawerMenu.setSelection(0);        //设置点击item事件        mDrawerMenu.setOnItemClickListener(new AdapterView.OnItemClickListener() {            @Override            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {                mTitle = ((TextView) view).getText().toString();                switchFragment();                mDrawerLayout.closeDrawer(mDrawerMenu);                mDrawerMenu.setSelection(position);            }        });    }    private void switchFragment() {        getSupportFragmentManager().beginTransaction().replace(R.id.drawer_container, new ItemFragment(mTitle)).commit();        getSupportActionBar().setTitle(mTitle);    }}

效果图如下：

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