AndroidDrawerLayout实现侧拉菜单功能

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package com.example.lenovo.mydrawerlayout; 
 import android.os.Bundle; 
import android.support.design.widget.Snackbar; 
import android.support.v4.view.GravityCompat; 
import android.support.v4.widget.DrawerLayout; 
import android.support.v7.app.ActionBarDrawerToggle; 
import android.support.v7.app.AppCompatActivity; 
import android.support.v7.widget.Toolbar; 
import android.view.View; 
import android.widget.TextView; 
public class MainActivity extends AppCompatActivity { 
  @Override 
  protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    //Toolbar代替ActionBar 
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
    setSupportActionBar(toolbar); 
    // DrawerLayout 
    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout); 
    //Toolbar上面最左边显示三杠图标监听DrawerLayout 
    ActionBarDrawerToggle toggle = new ActionBarDrawerToggle( 
        this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close); 
    drawer.setDrawerListener(toggle); 
    toggle.syncState(); 
    //侧拉页面字体 
    TextView t= (TextView) findViewById(R.id.t); 
    t.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
        Snackbar.make(v, "侧拉页面", Snackbar.LENGTH_LONG) 
            .setAction("Action", null).show(); 
      } 
    }); 
  } 
  @Override 
  public void onBackPressed() { 
    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout); 
    if (drawer.isDrawerOpen(GravityCompat.START)) { 
      drawer.closeDrawer(GravityCompat.START); 
    } else { 
      super.onBackPressed(); 
    } 
  } 
}