问题
I have gone through similar questions and their solutions here, but I can't get past my issue after spending few hours on it. I looked at many solutions, tried them, but still can't get to see the navigation drawer on my screen. I will really appreciate if someone could tell me what am I missing here.
Thanks in advance.
Here's my xml :
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout
android:id="@+id/drawer_layout"
android:layout_width="400dp"
android:layout_height="400dp"
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools">
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/content_frame" >
</FrameLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".Menu">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_vertical"
android:paddingLeft="16dp"
android:paddingRight="16dp"
android:textColor="#fff"
android:text="test"
android:id="@+id/text" />
</RelativeLayout>
<ListView
android:layout_width="200dp"
android:layout_height="match_parent"
android:layout_gravity="end"
android:choiceMode="singleChoice"
android:background="#fff"
android:id="@+id/left_drawer" >
</ListView>
</android.support.v4.widget.DrawerLayout>
Here's my Menu.java :
>public class Menu extends AppCompatActivity {
>
> public DrawerLayout dlayout;
> public ListView flist;
> public String[] menu;
> //public ArrayAdapter<String> mAdapter;
>
> @Override
> protected void onCreate(Bundle savedInstanceState) {
> super.onCreate(savedInstanceState);
> setContentView(R.layout.activity_menu);
>
> menu = getResources().getStringArray(R.array.nav_drawer_items);
> dlayout = (DrawerLayout) findViewById(R.id.drawer_layout);
> flist = (ListView) findViewById(R.id.left_drawer);
>
> flist.setAdapter(new ArrayAdapter<String>(this, R.layout.activity_menu, >R.id.text, menu));
> }
>}
I don't see any output.Screen output
回答1:
<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">
<include
android:id="@+id/header"
layout="@layout/menu"/>
<FrameLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:id="@+id/frame"
android:textSize="24sp"
android:gravity="center"
android:layout_marginTop="50dp"/>
<ListView
android:id="@+id/list_item"
android:layout_width="200dp"
android:layout_height="match_parent"
android:dividerHeight="1dp"
android:layout_gravity="left|start"
android:background="#ffeeeeee"/></android.support.v4.widget.DrawerLayout>
MainActivity.java
public class MainActivity extends Activity {
String[] names = {"android","java","spring","html"};
ListView list;
FrameLayout frame;
ActionBarDrawerToggle action;
DrawerLayout drawer;
Button but;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
frame = (FrameLayout) findViewById(R.id.frame);
list = (ListView) findViewById(R.id.list_item);
but = (Button) findViewById(R.id.menu);
ArrayAdapter adapter = new ArrayAdapter(this, android.R.layout.simple_list_item_1, names);
list.setAdapter(adapter);
action = new ActionBarDrawerToggle(this, drawer, R.string.drawer_open, R.string.drawer_close) {
/* Called when drawer is closed */
public void onDrawerClosed(View view) {
//Put your code here
}
/* Called when a drawer is opened */
public void onDrawerOpened(View drawerView) {
//Put your code here
}
};
drawer.setDrawerListener(action);
but.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (drawer != null) {
if (drawer.isDrawerOpen(list)) {
drawer.closeDrawer(list);
} else {
drawer.openDrawer(list);
process();
}
}
}
});
}
private void process() {
list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
FragmentTransaction ft=getFragmentManager().beginTransaction();
switch (names[position])
{
case "android":
{
yourClass obj=new yourClass();
//ft.replace(R.id.frame,obj);
break
}
case "java":
{
yourClass obj=new yourClass();
//ft.replace(R.id.frame,obj);
break;
}
case "spring":
{
yourClass obj=new yourClass();
//ft.replace(R.id.frame,obj);
break;
}
case "html":
{
yourClass obj=new yourClass();
//ft.replace(R.id.frame,obj);
break;
}
default:
{
Toast.makeText(MainActivity.this,"you have to click another one",Toast.LENGTH_LONG).show();
}
}
ft.commitAllowingStateLoss();
list.setItemChecked(position, true);
drawer.closeDrawer(list);
}
});
}
}
menu.xml
<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"
tools:context=".MainActivity"
android:layout_height="wrap_content">
<Button
android:id="@+id/menu"
android:title="menu"
android:icon="@drawable/menu"
android:background="@drawable/menu"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:backgroundTint="#0a0a0a" /></LinearLayout>
回答2:
seems that there should be problem in your layout file.
Remember that
DrawerLayoutallows maximum 2 child views. Have a look at this Google Doc.
It should be like:
<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">
<!-- The main content view -->
<FrameLayout
android:id="@+id/content_frame"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<!-- 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:background="#111"/>
</android.support.v4.widget.DrawerLayout>
回答3:
You need to toggle the open/close of the drawer. To do so, you can do the following :
1 - Implement the toggleDrawer method
public void toggleDrawer(boolean shouldBeVisible){
if(shouldBeVisible){
dlayout.openDrawer(dlayout);
} else {
dlayout.closeDrawers();
}
}
2 - Call it on onCreate (note : this is just for testing)
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
...
toggleDrawer(View.VISIBLE);
}
3 - Like Daryl said, implement a button so you can actively toggle (open and close the drawer to your liking)
myButton = (Button) findViewById(R.id.myButton);
myButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v){
if(dlayout.getVisiblity() == View.VISIBLE) {
// drawer is visible -> close
toggleDrawer(false);
} else {
// drawer is gone/invisible -> open
toggleDrawer(true);
}
}
})
4 - (Make sure your DrawerLayout contains only 2 child views)
To add a navigation drawer, declare your user interface with a DrawerLayout object as the root view of your layout. Inside the DrawerLayout, add one view that contains the main content for the screen (your primary layout when the drawer is hidden) and another view that contains the contents of the navigation drawer.
Note : Forgot to add this but is indeed an invaluable reference (thanks to @Meet, upvoted)
来源：https://stackoverflow.com/questions/38559248/unable-to-see-navigation-drawer