Android 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

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：