为什么我的导航抽屉在android不显示汉堡包图标。我已经做了一切，因为它应该做的，它仍然没有显示?
public class Main extends ActionBarActivity {
private String[] mPlanetTitles;
private DrawerLayout mDrawerLayout;
private ListView mDrawerList;
private CharSequence mTitle;
private ActionBarDrawerToggle mDrawerToggle;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.maina);
mTitle = "test";
ArrayList<Integer> draw=new ArrayList();
draw.add(R.drawable.elec);draw.add(R.drawable.mob);draw.add(R.drawable.auto);draw.add(R.drawable.pet);draw.add(R.drawable.est);
mPlanetTitles = new String[]{"Electronic ads", "Mobile ads", "Automobile ads","Pets ads","Real Estate ads"};
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerList = (ListView) findViewById(R.id.left_drawer);
Adapt c=new Adapt(this,draw);
mDrawerList.setAdapter(c);
DisplayMetrics displayMetrics =getApplicationContext().getResources().getDisplayMetrics();
int height=(int)((300 * displayMetrics.density) + 0.5);
GridView g=(GridView)findViewById(R.id.gridview);
ImageAdapter a=new ImageAdapter(this,draw);
g.setAdapter(a);
g.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
startActivity(new Intent(Main.this, MainActivity.class));
}
});
// Set the adapter for the list view
// mDrawerList.setAdapter(new ArrayAdapter<String>(this,
// R.layout.drawer_list_item, mPlanetTitles));
// Set the list's click listener
mDrawerList.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
mDrawerList.setItemChecked(i, true);
//setTitle(mPlanetTitles[position]);
mDrawerLayout.closeDrawer(mDrawerList);
}
});
mDrawerToggle = new ActionBarDrawerToggle(
this, /* host Activity */
mDrawerLayout, /* DrawerLayout object */
R.drawable.ic_drawer, /* nav drawer icon to replace 'Up' caret */
R.string.drawer_open, /* "open drawer" description */
R.string.drawer_close /* "close drawer" description */
) {
/** Called when a drawer has settled in a completely closed state. */
public void onDrawerClosed(View view) {
mDrawerToggle.syncState();
getSupportActionBar().setTitle(mTitle);
invalidateOptionsMenu();
}
/** Called when a drawer has settled in a completely open state. */
public void onDrawerOpened(View drawerView) {
mDrawerToggle.syncState();
getSupportActionBar().setTitle(mTitle);
mDrawerList.bringToFront();
invalidateOptionsMenu();
}
};
// Set the drawer toggle as the DrawerListener
mDrawerLayout.setDrawerListener(mDrawerToggle);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setHomeButtonEnabled(true);
getSupportActionBar().setIcon(R.drawable.ic_drawer);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
mDrawerToggle.syncState();
// Sync the toggle state after onRestoreInstanceState has occurred.
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
mDrawerToggle.onConfigurationChanged(newConfig);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Pass the event to ActionBarDrawerToggle, if it returns
// true, then it has handled the app icon touch event
if (mDrawerToggle.onOptionsItemSelected(item)) {
return true;
}
// Handle your other action bar items...
return super.onOptionsItemSelected(item);
}
/**
* Swaps fragments in the main content view
*/
private void selectItem(int position) {
Toast.makeText(this, R.string.app_name, Toast.LENGTH_SHORT).show();
// Highlight the selected item, update the title, and close the drawer
mDrawerList.setItemChecked(position, true);
setTitle(mPlanetTitles[position]);
mDrawerLayout.closeDrawer(mDrawerList);
}
@Override
public void setTitle(CharSequence title) {
mTitle = title;
getSupportActionBar().setTitle(mTitle);
}
private class DrawerItemClickListener implements ListView.OnItemClickListener {
@Override
public void onItemClick(AdapterView parent, View view, int position, long id) {
selectItem(position);
}
}
}
这是我的布局文件。
<android.support.v4.widget.DrawerLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<!-- The main content view -->
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<GridView
android:id="@+id/gridview"
android:layout_width="match_parent"
android:numColumns="3"
android:gravity="center"
android:stretchMode="columnWidth"
android:verticalSpacing="10dp"
android:horizontalSpacing="10dp"
android:layout_height="match_parent"/>
</RelativeLayout>
<!-- The navigation drawer -->
<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.support.v4.widget.DrawerLayout>
为什么图标汉堡包不显示?
还要记住，ActionBarActivity是已弃用使用:AppCompatActivity和关于NavigationDrawer你应该使用NavigationView
看起来您正在使用支持库v4中发现的已弃用的ActionBarDrawerToggle版本。您的IDE应该警告您这种用法。您还在使用已弃用的ActionBarActivity .
您应该切换到在v7支持库中找到的新ActionBarDrawerToggle。
交换新的很容易-只需更改您的导入并删除R.drawable.ic_drawer参数。新的开关为您提供了可绘制的抽屉