Android getActionProvider:项未实现SupportMenuItem
我试图使用片段中上下文操作栏中的支持库实现一个Android getActionProvider:项未实现SupportMenuItem,android,android-support-library,Android,Android Support Library,我试图使用片段中上下文操作栏中的支持库实现一个ShareActionProvider。我在普通操作栏(onCreateOptions菜单())中实现它时没有遇到任何问题,但当我在CAB中尝试它时(在multipleListener界面中的onCreateActionMode()),我得到了错误: getActionProvider: item does not implement SupportMenuItem; returning null 查看上的Android源代码,问题似乎是因为我的M
ShareActionProvider
。我在普通操作栏(onCreateOptions菜单())中实现它时没有遇到任何问题,但当我在CAB中尝试它时(在multipleListener
界面中的onCreateActionMode()),我得到了错误:
getActionProvider: item does not implement SupportMenuItem; returning null
查看上的Android源代码,问题似乎是因为我的MenuItem
不是SupportMenuItem
的实例:
public static ActionProvider getActionProvider(MenuItem item) {
if (item instanceof SupportMenuItem) {
return ((SupportMenuItem) item).getSupportActionProvider();
}
// TODO Wrap the framework ActionProvider and return it
Log.w(TAG, "getActionProvider: item does not implement SupportMenuItem; returning null");
return null;
}
有什么办法可以解决这个问题吗
清单:
<activity
android:name=".myactivity_ActionBarActivity"
android:theme="@style/Theme.AppCompat.Light"
android:windowSoftInputMode="stateUnchanged">
<intent-filter>
<action android:name="android.intent.action.VIEW" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
public class myactivity_ActionBarActivity extends ActionBarActivity{
@Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.actionbaractivity_layout); //loads a fragment
}
}
import android.support.v7.widget.ShareActionProvider;
import android.support.v4.view.MenuItemCompat;
import android.view.MenuItem;
import android.view.Menu;
import android.support.v4.app.Fragment;
...
...
@Override
public void onActivityCreated(Bundle savedInstanceState) {
...
...
//Handle Action mode events
myListView.setMultiChoiceModeListener(new MultiChoiceModeListener() {
private ShareActionProvider mShareActonProvider;
....
....
@Override
public boolean onCreateActionMode(ActionMode mode,
Menu menu) {
MenuInflater inflater = mode.getMenuInflater();
inflater.inflate(R.menu.chatsession_contextmenu, menu);
//get the ShareActionProvider from the menu item
MenuItem item = menu.findItem(R.id.share_menu);
mShareActonProvider = (ShareActionProvider) MenuItemCompat.getActionProvider(item);
return true;
}
}
...
...
}
<?xml version="1.0" encoding="utf-8" ?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:myapp="http://schemas.android.com/apk/res-auto">
<item
android:id="@+id/delete_menu"
android:title="Delete message"
myapp:showAsAction="ifRoom|withText"
android:icon="@drawable/ic_action_discard">
</item>
<item
android:id="@+id/share_menu"
android:title="Share message"
myapp:showAsAction="ifRoom|withText"
android:icon="@drawable/ic_action_share"
myapp:actionProviderClass="android.support.v7.widget.ShareActionProvider">
</item>
</menu>
片段:
<activity
android:name=".myactivity_ActionBarActivity"
android:theme="@style/Theme.AppCompat.Light"
android:windowSoftInputMode="stateUnchanged">
<intent-filter>
<action android:name="android.intent.action.VIEW" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
public class myactivity_ActionBarActivity extends ActionBarActivity{
@Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.actionbaractivity_layout); //loads a fragment
}
}
import android.support.v7.widget.ShareActionProvider;
import android.support.v4.view.MenuItemCompat;
import android.view.MenuItem;
import android.view.Menu;
import android.support.v4.app.Fragment;
...
...
@Override
public void onActivityCreated(Bundle savedInstanceState) {
...
...
//Handle Action mode events
myListView.setMultiChoiceModeListener(new MultiChoiceModeListener() {
private ShareActionProvider mShareActonProvider;
....
....
@Override
public boolean onCreateActionMode(ActionMode mode,
Menu menu) {
MenuInflater inflater = mode.getMenuInflater();
inflater.inflate(R.menu.chatsession_contextmenu, menu);
//get the ShareActionProvider from the menu item
MenuItem item = menu.findItem(R.id.share_menu);
mShareActonProvider = (ShareActionProvider) MenuItemCompat.getActionProvider(item);
return true;
}
}
...
...
}
<?xml version="1.0" encoding="utf-8" ?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:myapp="http://schemas.android.com/apk/res-auto">
<item
android:id="@+id/delete_menu"
android:title="Delete message"
myapp:showAsAction="ifRoom|withText"
android:icon="@drawable/ic_action_discard">
</item>
<item
android:id="@+id/share_menu"
android:title="Share message"
myapp:showAsAction="ifRoom|withText"
android:icon="@drawable/ic_action_share"
myapp:actionProviderClass="android.support.v7.widget.ShareActionProvider">
</item>
</menu>
菜单布局文件:
<activity
android:name=".myactivity_ActionBarActivity"
android:theme="@style/Theme.AppCompat.Light"
android:windowSoftInputMode="stateUnchanged">
<intent-filter>
<action android:name="android.intent.action.VIEW" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
public class myactivity_ActionBarActivity extends ActionBarActivity{
@Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.actionbaractivity_layout); //loads a fragment
}
}
import android.support.v7.widget.ShareActionProvider;
import android.support.v4.view.MenuItemCompat;
import android.view.MenuItem;
import android.view.Menu;
import android.support.v4.app.Fragment;
...
...
@Override
public void onActivityCreated(Bundle savedInstanceState) {
...
...
//Handle Action mode events
myListView.setMultiChoiceModeListener(new MultiChoiceModeListener() {
private ShareActionProvider mShareActonProvider;
....
....
@Override
public boolean onCreateActionMode(ActionMode mode,
Menu menu) {
MenuInflater inflater = mode.getMenuInflater();
inflater.inflate(R.menu.chatsession_contextmenu, menu);
//get the ShareActionProvider from the menu item
MenuItem item = menu.findItem(R.id.share_menu);
mShareActonProvider = (ShareActionProvider) MenuItemCompat.getActionProvider(item);
return true;
}
}
...
...
}
<?xml version="1.0" encoding="utf-8" ?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:myapp="http://schemas.android.com/apk/res-auto">
<item
android:id="@+id/delete_menu"
android:title="Delete message"
myapp:showAsAction="ifRoom|withText"
android:icon="@drawable/ic_action_discard">
</item>
<item
android:id="@+id/share_menu"
android:title="Share message"
myapp:showAsAction="ifRoom|withText"
android:icon="@drawable/ic_action_share"
myapp:actionProviderClass="android.support.v7.widget.ShareActionProvider">
</item>
</menu>
您确定您的活动扩展了
ActionBarActivity
吗?问题在于MultipleModeListener
接口扩展了android.view.ActionMode.Callback
,如处的源代码所示。如果使用支持库中的ShareActionProvider
,则需要使用android.support.v7.view.ActionMode.Callback
解决方案是创建您自己的ActionMode.CallBack实现,而不是使用框架的MultipleModeListener
。通过这种方式,您可以确保在需要时使用支持库
例如:
ActionMode
和ActionBarActivity
的v7版本
import android.support.v7.view.ActionMode;
import android.support.v7.app.ActionBarActivity;
onClickListener
,并使用startSupportActionMode
启动自定义ActionMode.CallBack
实现
myListView.setItemsCanFocus(false);
myListView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
actionMode = null;
myListView.setOnItemClickListener(new OnItemClickListener(){
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id){
if(myListView.getCheckedItemCount() == 0){
actionMode.finish();
return;
}
if(actionMode == null){
actionMode = ((ActionBarActivity)getActivity()).startSupportActionMode(new ContextualActionBar());
}
}
});
private class ContextualActionBar implements ActionMode.Callback{
private ShareActionProvider mShareActionProvider;
@Override
public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
switch(item.getItemId()){
case R.id.share_menu :
mode.finish();
return true;
default :
return false;
}
}
@Override
public boolean onCreateActionMode(ActionMode mode, Menu menu) {
MenuInflater inflater = mode.getMenuInflater();
inflater.inflate(R.menu.chatsession_contextmenu, menu);
//Initialize the ShareActionProvider
MenuItem shareMenuItem = menu.findItem(R.id.share_menu);
mShareActionProvider = (ShareActionProvider) MenuItemCompat.getActionProvider(shareMenuItem);
Intent shareIntent = new Intent(Intent.ACTION_SEND);
shareIntent.setType("text/plain");
shareIntent.putExtra(Intent.EXTRA_TEXT, "test message");
mShareActionProvider.setShareIntent(shareIntent);
return true;
}
@Override
public void onDestroyActionMode(ActionMode mode) {
//Nullify the actionMode object
//so that the onClickListener can identify whether the ActionMode is ON
actionMode = null;
//Uncheck all checked messages
SparseBooleanArray selectedItems = myListView.getCheckedItemPositions();
for(int i=0;i<selectedItems.size();i++){
myListView.setItemChecked(selectedItems.keyAt(i), false);
}
}
@Override
public boolean onPrepareActionMode(ActionMode arg0, Menu arg1) {
// TODO Auto-generated method stub
return false;
}
}
我有一个几乎相同的设置。在我的例子中,问题是Proguard优化了
ShareActionProvider
的构造函数。有一个bug,他们保留了XML中检测到的ActionProvider
类的类和方法,但没有保留构造函数或类名
如果您的日志中有“无法实例化类”警告,那么这也适用于您
这是帮助我的
我添加的proguard配置是:
-keepnames public class * extends android.support.v4.view.ActionProvider
-keepclassmembers public class * extends android.support.v4.view.ActionProvider {
<init>(android.content.Context);
}
-keepnames public class*扩展了android.support.v4.view.ActionProvider
-keepclassmembers公共类*扩展了android.support.v4.view.ActionProvider{
(android.content.Context);
}
在onCreateActionMode中填充IMenu时,请小心使用右菜单展开器。当我使用mode对象中的一个时,正如您在片段类中所做的那样,它不会创建ShareActionProvider的支持版本。我从父AppCompatActivity类切换到使用MenuInflater,效果很好
假设模式对象来自support library,可以假设它将使用support inflater,但显然不是。是的,我使用ActionBarActivity。我已经用活动代码编辑了这个问题。我建议先在
oncreateoptions菜单中创建ActionProvider
类,让我们知道它是否有效。ActionProvider
在oncreateoptions菜单中运行得非常好。我想知道它与MultiChoiceModeListener
界面中的onCreateActionMode
有何不同。MultiChoiceModeListener
没有实现SupportMenuItem
。我相信,这是由活动
类完成的。您可以通过在Acitivity
类中将menuItem
声明为成员来尝试解决这个问题。我认为这是不可能的。如果我在MultiChoiceModeListener()
定义之外的任何地方声明menuItem
,就会得到错误-无法引用在不同方法中定义的内部类中的非最终变量menuItem
。如果我将其声明为final,则会出现错误final局部变量menuItem无法赋值,因为它是在封闭类型中定义的
。与接受的答案一起为我工作。