问题描述
我的应用中有两个布局文件.我也有活动扩展了 ListActivity.此活动的每个项目看起来都考虑 item.xml 布局文件.我试图在长按项目时获取上下文菜单，但我没有看到.
I have a two layouts files in my app. Also I have Activity extends ListActivity. Every item of this activity looks consider item.xml layout file. I am trying to get context menu when make long presss on item, but I don't see it.
在我的活动中，我尝试 registerForContextMenu(getListView()) 并覆盖两个方法
In my activity I trying to registerForContextMenu(getListView()) and override two methods
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Bundle bundle = this.getIntent().getExtras();
registerForContextMenu(getListView());
new PopulateAdapterTask().execute(ACTION_SELECT);
}
@Override
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.context_menu, menu);
}
@Override
public boolean onContextItemSelected(MenuItem item) {
AdapterView.AdapterContextMenuInfo info;
try {
info = (AdapterView.AdapterContextMenuInfo) item.getMenuInfo();
} catch (ClassCastException e) {
return false;
}
long id = getListAdapter().getItemId(info.position);
Log.d(TAG, "id = " + id);
return true;
}
Main.xml
<?xml version="1.0" encoding="utf-8"?>
<TabHost xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@android:id/tabhost"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<LinearLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:padding="5dp">
<TabWidget
android:id="@android:id/tabs"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>
<FrameLayout
android:id="@android:id/tabcontent"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:padding="5dp">
<ListView
android:id="@+id/list"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
/>
</FrameLayout>
</LinearLayout>
</TabHost>
项目.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
>
<ImageView
android:id="@+id/icon"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
<TextView
android:id="@+id/info"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="10dp"
android:textSize="15sp"
android:singleLine="true"
android:ellipsize="marquee"
android:scrollHorizontally = "true"
android:maxWidth="200dp"
/>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="right"
>
<ImageButton
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:background="@null"
android:paddingRight="10dp"
android:paddingLeft="10dp"
/>
</LinearLayout>
</LinearLayout>
这一切都行不通.也许原因是在 LinearLayout 中?我也发现了类似的话题 Android:具有由 LinearLayout 定义的成员的 ListView 没有显示上下文菜单?但我有更复杂的列表项.
All this doesn't work. Maybe the reason is in LinearLayout? I also find similar topic Android: Context menu doesn't show up for ListView with members defined by LinearLayout? but I have more complicated list item.
在我的情况下如何获取上下文菜单?
How to get context menu in my case?
也在我的活动中，我有内部类扩展了 ArrayAdapter.在 getView 方法的这个类中，我可以在每个视图上设置 OnCreateContextMenuListener，在出现上下文菜单后，但我不知道如何处理项目点击.如果我试图在 onContextItemSelected 方法中执行此操作，则 item.getMenuInfo() 对象始终为 null，我无法从中获取一些信息.
Also in my activity I have inner class extends ArrayAdapter. In this class in getView method I can set OnCreateContextMenuListener on every View, after that context menu is appears, but I don't know how to handle items clicks. If I am trying to do this in method onContextItemSelected, item.getMenuInfo() object always is null and i can't to get some information from it.
private class ChannelAdapter extends ArrayAdapter<Channel> {
private List<Channel> channels;
public ChannelAdapter(Context context, int textViewResourceId, List<Channel> objects) {
super(context, textViewResourceId, objects);
this.channels = objects;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View v = convertView;
if (v == null) {
LayoutInflater vi = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v = vi.inflate(R.layout.station_item, null);
}
v.setOnCreateContextMenuListener(new View.OnCreateContextMenuListener() {
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.context_menu, menu);
}
});
谢谢.希望得到您的帮助.
Thanks. Hope for your help.
推荐答案
我得到了解决方案，我的朋友帮助了我！希望这些信息对某人有帮助.这是带有 ArrayAdapter 和复杂列表布局和上下文菜单的完整类代码.
I got solution, my friend helped me! Hope this information will helpful to someone.This is complete class code with ArrayAdapter and complex list layout and context menu.
public class ComplexListActivity extends ListActivity {
/**
* Called when the activity is first created.
*/
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setListAdapter(new ComplexObjectAdapter(this, R.layout.item, getComplexObjects()));
registerForContextMenu(getListView());
}
private List getComplexObjects() {
List<ComplexObject> list = new ArrayList<ComplexObject>();
list.add(new ComplexObject("1", "1", getResources().getDrawable(R.drawable.icon)));
list.add(new ComplexObject("2", "2", getResources().getDrawable(R.drawable.icon)));
list.add(new ComplexObject("3", "3", getResources().getDrawable(R.drawable.icon)));
list.add(new ComplexObject("4", "4", getResources().getDrawable(R.drawable.icon)));
list.add(new ComplexObject("5", "5", getResources().getDrawable(R.drawable.icon)));
list.add(new ComplexObject("6", "6", getResources().getDrawable(R.drawable.icon)));
list.add(new ComplexObject("7", "7", getResources().getDrawable(R.drawable.icon)));
list.add(new ComplexObject("8", "8", getResources().getDrawable(R.drawable.icon)));
list.add(new ComplexObject("9", "9", getResources().getDrawable(R.drawable.icon)));
return list;
}
@Override
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.context_menu, menu);
}
@Override
public boolean onContextItemSelected(MenuItem item) {
AdapterView.AdapterContextMenuInfo info;
try {
info = (AdapterView.AdapterContextMenuInfo) item.getMenuInfo();
} catch (ClassCastException e) {
Log.e("", "bad menuInfo", e);
return false;
}
long id = getListAdapter().getItemId(info.position);
Log.d("", "id = " + id);
Toast.makeText(this, "id = " + id, Toast.LENGTH_SHORT).show();
return true;
}
private class ComplexObjectAdapter extends ArrayAdapter<ComplexObject> implements View.OnCreateContextMenuListener {
private List<ComplexObject> objects;
public ComplexObjectAdapter(Context context, int textViewResourceId, List<ComplexObject> objects) {
super(context, textViewResourceId, objects);
this.objects = objects;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View v = convertView;
if (v == null) {
LayoutInflater vi = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v = vi.inflate(R.layout.item, null);
}
final ComplexObject o = objects.get(position);
if (o != null) {
TextView textlInfo = (TextView) v.findViewById(R.id.info);
textlInfo.setText(o.getName());
ImageView channelIcon = (ImageView) v.findViewById(R.id.icon);
channelIcon.setAdjustViewBounds(true);
channelIcon.setMaxHeight(30);
channelIcon.setMaxWidth(30);
channelIcon.setImageDrawable(o.getLogo());
ImageButton button = (ImageButton) v.findViewById(R.id.button);
button.setImageResource(R.drawable.icon);
v.setOnCreateContextMenuListener(this);
}
return v;
}
public void onCreateContextMenu(ContextMenu contextMenu, View view, ContextMenu.ContextMenuInfo contextMenuInfo) {
// empty implementation
}
}
}
如果有人会找到更好的方法，请告诉我.谢谢！
let me know if someone will find better approach. Thanks!
这篇关于自定义 ListView 和上下文菜单.如何获得?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！