侧拉 DrawerLayout 懵！

package com.lbs.xlist_view;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.FrameLayout;import android.widget.ListView;import java.util.ArrayList;import java.util.List;public class MainActivity extends AppCompatActivity {    List<String> list = new ArrayList<>();    private DrawerLayout drawerLayout;    private FrameLayout fl;    private ListView lv;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        lv = (ListView) findViewById(R.id.lv);        fl = (FrameLayout) findViewById(R.id.fl);        drawerLayout = (DrawerLayout) findViewById(R.id.drawerLayout);        initdata();        lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {            @Override            public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {                fragment_cla getinst = fragment_cla.getinst(list.get(i));                getSupportFragmentManager().beginTransaction().replace(R.id.fl,getinst).commit();                drawerLayout.closeDrawer(lv);            }        });    }    private void initdata() {        for (int i = 0 ; i < 10 ; i++){            list.add("drawerLayout"+i);        }        ArrayAdapter<String> stringArrayAdapter = new ArrayAdapter<>(MainActivity.this, android.R.layout.simple_list_item_1, list);        lv.setAdapter(stringArrayAdapter);    }}

package com.lbs.xlist_view;import android.os.Bundle;import android.support.annotation.Nullable;import android.support.v4.app.Fragment;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.TextView;/** * author:Created by WangZhiQiang on 2017/11/9. */public class fragment_cla extends Fragment {    @Nullable    @Override    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {        TextView textView = new TextView(getActivity());        Bundle bundle = getArguments();        String name = (String) bundle.get("name");        textView.setText(name);        return textView ;    }    @Override    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {        super.onViewCreated(view, savedInstanceState);    }    public static fragment_cla getinst(String s) {        fragment_cla fragment_cla = new fragment_cla();        Bundle bundle = new Bundle();        bundle.putString("name",s);        fragment_cla.setArguments(bundle);        return fragment_cla;    }}//////////////////与上面的无关 
<?xml version="1.0" encoding="utf-8"?><android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    xmlns:tools="http://schemas.android.com/tools"    android:id="@+id/drawe"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context="com.lbs.zhoukaomoni.MainActivity">    <LinearLayout        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:orientation="vertical">        <com.bwie.xlistviewlibrary.View.XListView            android:id="@+id/xlistview1"            android:layout_width="wrap_content"            android:layout_height="wrap_content"></com.bwie.xlistviewlibrary.View.XListView>    </LinearLayout>    <ListView        android:id="@+id/drawe_lv"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_gravity="start"        android:choiceMode="singleChoice"        android:clickable="true" /></android.support.v4.widget.DrawerLayout>