我有一个 FragmentActivity，它在 EditText 和一个按钮上方加载一个带有 ListView 的 RelativeLayout。我似乎无法以任何方式显示键盘。当我触摸它或将焦点放在它上面时，什么也没有发生。当我自动请求焦点时，什么也没有发生。如何让键盘显示？这不应该是自动的吗？我想模拟 GTALK 的聊天输入。
activity_contact_chat.xml：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/contact_detail_container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:descendantFocusability="blocksDescendants"
android:orientation="horizontal" >
<Button
android:id="@+id/details_record_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:layout_alignTop="@+id/chat_message_input"
android:text="Send" />
<EditText
android:id="@+id/chat_message_input"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_toLeftOf="@+id/details_record_button"
android:ems="10"
android:gravity="top|left"
android:hint="@string/message_hint"
android:lines="1"
android:maxLines="10"
android:paddingRight="10dp"
android:paddingTop="10dp"
android:scrollbars="vertical" >
</EditText>
<ListView
android:id="@+id/messages_list"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_above="@+id/chat_message_input"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:background="#000000" >
</ListView>
</RelativeLayout>
联系聊天片段：
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.LoaderManager;
import android.support.v4.content.CursorLoader;
import android.support.v4.content.Loader;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
public class ContactChatFragment extends Fragment implements LoaderManager.LoaderCallbacks<Cursor>{
ListView messageList;
Long contact_id;
String contact_UUID, contact_name;
private static final int CONTACT_CHAT_LOADER = 0x11;
MessageListAdapter adapter;
private static final String STATE_ACTIVATED_POSITION = "activated_position";
private int mActivatedPosition = ListView.INVALID_POSITION;
public static final String EXTRA_CONTACTID = "item_id";
String contact_rowID;
@Override
public void onCreate(Bundle savedInstances) {
super.onCreate(savedInstances);
if (getArguments().containsKey(EXTRA_CONTACTID)) {
contact_rowID = getArguments().getString(EXTRA_CONTACTID);
//Let's get the contact
String projection[] = { DBHelper.CONTACTS_ROWID, DBHelper.CONTACTS_UUID, DBHelper.CONTACTS_NAME, DBHelper.CONTACTS_PUBLIC_KEY };
Cursor contactCursor = getActivity().getContentResolver().query(Uri.withAppendedPath(ContactProvider.CONTENT_URI, String.valueOf(contact_rowID)),projection, null, null, null);
if (contactCursor.moveToFirst()) {
contact_id = contactCursor.getLong(contactCursor.getColumnIndex(DBHelper.CONTACTS_ROWID));
contact_UUID = contactCursor.getString(contactCursor.getColumnIndex(DBHelper.CONTACTS_UUID));
contact_name = contactCursor.getString(contactCursor.getColumnIndex(DBHelper.CONTACTS_NAME));
}
}
adapter = new MessageListAdapter(getActivity(), null, 0);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.activity_contact_chat, container, false);
messageList = (ListView) rootView.findViewById(R.id.messages_list);
messageList.setAdapter(adapter);
getLoaderManager().initLoader(CONTACT_CHAT_LOADER, null, this);
/*
TextView empty = new TextView(getActivity());
empty = (TextView) messageList.getEmptyView();
empty.setText(R.string.chat_no_messages);
empty.setVisibility(View.GONE);
((ViewGroup) messageList.getParent()).addView(empty);
messageList.setEmptyView(empty);
*/
EditText message_input_text = (EditText) rootView.findViewById(R.id.chat_message_input);
message_input_text.clearFocus();
Button message_input_button = (Button) rootView.findViewById(R.id.details_record_button);
message_input_button.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Toast.makeText(getActivity(), "Hi!",Toast.LENGTH_SHORT).show();
}
});
return rootView;
}
@Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
if (mActivatedPosition != ListView.INVALID_POSITION) {
// Serialize and persist the activated item position.
outState.putInt(STATE_ACTIVATED_POSITION, mActivatedPosition);
}
}
@Override
public Loader<Cursor> onCreateLoader(int id, Bundle args) {
String[] projection = {DBHelper.MESSAGES_ROWID, DBHelper.MESSAGES_CONTENT, DBHelper.MESSAGES_CONTENT_LOCATION, DBHelper.MESSAGES_LOCATION, DBHelper.MESSAGES_READ_DATE, DBHelper.MESSAGES_UUID_FROM, DBHelper.MESSAGES_UUID_TO};
CursorLoader cursorLoader = new CursorLoader(getActivity(), MessageProvider.CONTENT_URI, projection, null, null, null);
return cursorLoader;
}
@Override
public void onLoadFinished(Loader<Cursor> loader, Cursor cursor) {
adapter.swapCursor(cursor);
}
@Override
public void onLoaderReset(Loader<Cursor> loader) {
adapter.swapCursor(null);
}
}