Android DrawerLayout implements drawer effect example code

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

Paste the main logic and layout files:

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:id="@+id/drawer_layout"
  android:layout_width="match_parent"
  android:layout_height="match_parent">
  <!-- content -->
  <FrameLayout
    android:id="@+id/drawer_container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"/>
  <!-- Drawer-->
  <ListView
    android:id="@+id/drawer_menu"
    android:layout_width="240dp"
    android:layout_height="match_parent"
    android:background="#FFF0F0F0"
    android:layout_gravity="start"/>
  <!--
    android:choiceMode    选中状态 跟onItemClick没有冲突
        none       值为0，表示无选择模式；
        singleChoice   值为1，表示最多可以有一项被选中；
        multipleChoice  值为2，表示可以多项被选中。
    android:layout_gravity left或right left或start  right或end
      表示在抽屉里的效果是从左到右还是从右到左出现
  -->
</android.support.v4.widget.DrawerLayout>

Something to note here: the main content interface must be defined in front of the drawer. In addition, Android:layout_gravity="start" (from left to right) or android:layout_gravity="end" (from right to Left), this attribute must be defined, otherwise the following exception will occur:

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<String> 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);
  }
}

The rendering is as follows:

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