导航抽屉没有显示汉堡包图标
在小应用程序中，我想使用导航抽屉，但左箭头键既不起作用也不是汉堡包图标......你能找出问题吗？
MainActivity.java
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<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>content_main.xml
package com.example.bablu.zoo;
import android.content.res.Configuration;
import android.os.Bundle;
import android.os.PersistableBundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
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.view.Menu;
import android.view.MenuItem;
public class MainActivity extends AppCompatActivity {
private DrawerLayout mDrawerLayout;
private ActionBarDrawerToggle mActionBarDrawerToggle;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
// For navigation bar
if (getSupportActionBar() != null) {
getSupportActionBar().setDisplayShowHomeEnabled(true);
}
getSupportActionBar().setHomeButtonEnabled(true);
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mActionBarDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout, R.string.drawer_opened, R.string.drawer_closed){
@Override
public void onDrawerOpened(View drawerView) {
super.onDrawerOpened(drawerView);
if(getSupportActionBar() != null)
getSupportActionBar().setTitle(R.string.drawer_opened);
mActionBarDrawerToggle.syncState();
}
@Override
public void onDrawerClosed(View drawerView) {
super.onDrawerClosed(drawerView);
if(getSupportActionBar() != null)
getSupportActionBar().setTitle(R.string.drawer_closed);
mActionBarDrawerToggle.syncState();
}
};
mDrawerLayout.addDrawerListener(mActionBarDrawerToggle);
}
@Override
public void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
mActionBarDrawerToggle.syncState();
//Call syncState() from your activity's onPostCreate to set the state of the indicator
// based on whether the drawerlayout is in open or closed state once the activity
// has been restored with onRestoreInstanceState.
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
mActionBarDrawerToggle.onConfigurationChanged(newConfig);
//When the device is rotated the method 'onConfigurationChanged(newConfig' knows when the drawer is open or close.
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
if(mActionBarDrawerToggle.onOptionsItemSelected(item))
return true;
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
activity_main.xml中
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context="com.example.bablu.zoo.MainActivity"
tools:showIn="@layout/activity_main">
<android.support.v4.widget.DrawerLayout
android:id="@+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello world"/>
<ListView android:id="@+id/left_drawer"
android:layout_width="240dp"
android:layout_height="match_parent"
android:layout_gravity="start"
android:choiceMode="singleChoice"
android:divider="@android:color/transparent"
android:dividerHeight="0dp"
android:background="#111"/>
</android.support.v4.widget.DrawerLayout>
</LinearLayout>
以下是以下图片：
谢谢！
1 个答案:
答案 0 :(得分：2)
在您的代码中添加toolbar
在行中看到这个
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mActionBarDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout, R.string.drawer_opened, R.string.drawer_closed)
使用这种方式
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mActionBarDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout, toolbar, R.string.drawer_opened, R.string.drawer_closed)
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