我有一个listView，在我的Android应用程序和listView上面填充了我现有的数据库，我有一个searchView，这样我就可以输入内容然后查询数据库，然后在listView中显示这些结果。首先，在我输入任何内容之前，我会在其中显示数据库中的所有项目。但是当我在searchView中放入一些东西时，它不会向我提供任何结果，我点击空白屏幕，屏幕崩溃，但它不应该这样做。我想要能够点击它我想要的所有内容，但也显示一条消息说没有找到结果。此外，当我清除searchView时，我想要我的原始结果，所有项目再次显示。我在下面发布了我的代码，所以任何帮助都会很棒。
shirtsActivity.java
package ankitkaushal.app.healthysizing;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SearchView;
import android.widget.TextView;
import android.widget.Toast;
import org.w3c.dom.Text;
import java.io.IOException;
import java.util.ArrayList;
public class shirtsActivity extends ActionBarActivity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_shirts);
final SearchView shirtViewShirts = (SearchView) findViewById(R.id.searchView3);
final DatabaseHelper dbhelper;
final ListView listView;
final ListAdapter shirtsAdapter;
dbhelper = new DatabaseHelper(getApplicationContext());
try {
dbhelper.createDataBase();
} catch (IOException e) {
e.printStackTrace();
}
listView = (ListView) findViewById(R.id.listViewShirts);
//List<Item> shirtsList = dbhelper.getAllShirts();
ArrayList<Item> shirtsList = dbhelper.getAllShirts();
if (shirtsList != null) {
//shirtsAdapter = new ArrayAdapter<Item>(getApplicationContext(), android.R.layout.simple_list_item_1, android.R.id.text1, shirtsList);
shirtsAdapter = new ListItemAdapter(getApplicationContext(), shirtsList);
listView.setAdapter(shirtsAdapter);
}
shirtViewShirts.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
@Override
public boolean onQueryTextSubmit(String query) {
query = query.toLowerCase();
query = Character.toString(query.charAt(0)).toUpperCase()+query.substring(1);
ListAdapter searchedShirtsAdapter;
Log.e("Brand: ", query);
ArrayList<Item> searchedShirtsList = dbhelper.getAllSearchedShirts(query);
if (searchedShirtsList != null) {
searchedShirtsAdapter = new ListItemAdapter(getApplicationContext(), searchedShirtsList);
listView.setAdapter(searchedShirtsAdapter);
}
else if (searchedShirtsList.isEmpty()) {
searchedShirtsAdapter = new ListItemAdapter(getApplicationContext(), searchedShirtsList);
listView.setAdapter(searchedShirtsAdapter);
}
return false;
}
@Override
public boolean onQueryTextChange(String newText) {
return false;
}
});
}
}
listItemAdapter.java
package ankitkaushal.app.healthysizing;
import java.util.ArrayList;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;
public final class ListItemAdapter extends ArrayAdapter<Item> implements View.OnClickListener{
public ListItemAdapter(Context context, ArrayList<Item> shirtItems) {
super(context, 0, shirtItems);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// Get the data item for this position
Item item = getItem(position);
// Check if an existing view is being reused, otherwise inflate the view
if (convertView == null) {
convertView = LayoutInflater.from(getContext()).inflate(R.layout.item_layout_shirts, parent, false);
}
// Lookup view for data population
TextView brand = (TextView) convertView.findViewById(R.id.txt_shirt_brand);
TextView price = (TextView) convertView.findViewById(R.id.txt_shirt_price);
TextView store = (TextView) convertView.findViewById(R.id.txt_shirt_store);
TextView description = (TextView) convertView.findViewById(R.id.txt_shirt_description);
// Populate the data into the template view using the data object
brand.setText("Brand:" + " " + item.getBrand());
price.setText("Price:" + " " + item.getPrice());
store.setText("Store:" + " " + item.getStore());
description.setText("Description:" + " " + item.getDescription());
// Return the completed view to render on screen
return convertView;
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
}
}
activity_shirts.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#29A9D2"
android:weightSum="1"
android:id="@+id/shirt"
android:onClick="onClickSearch">
<SearchView
android:layout_width="352dp"
android:layout_height="wrap_content"
android:id="@+id/searchView3"
android:background="#ffffffff"
android:queryHint="Search for a specific brand" />
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<ListView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/listViewShirts"
android:layout_centerHorizontal="true"
android:layout_alignParentTop="true" />
<TextView
android:id="@+id/list_empty_shirts"
android:text="No Results Found"
android:layout_width="100dp"
android:layout_height="100dp"
android:layout_gravity="center"
android:textColor="#FFFFFF"
android:gravity="center"
android:textSize="40dp"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:visibility="invisible" />
</RelativeLayout>
</LinearLayout>
答案 0 :(得分：0)
首先，在xml文件中创建一个纯文本视图，其中包含您的活动所需的消息。
然后尝试添加：
listView.setEmptyView(findViewById(R.id.___);
使用您创建的textview的ID填写此行的___部分。