我有一個(gè) SQLite 數(shù)據(jù)庫(kù)，我想使用 ListView 顯示每個(gè) ROW/Campsite。DBHandler 方法返回 Campsites 的 ArrayList：public ArrayList<Campsite> getAllCampsites() { SQLiteDatabase db = this.getReadableDatabase(); Cursor cursor = db.rawQuery("SELECT * FROM " + TABLE_CAMPSITES, null); ArrayList<Campsite> campsites = new ArrayList<>(); Campsite campsite; if (cursor.getCount() > 0) { for (int i = 0; i < cursor.getCount(); i++) { cursor.moveToNext(); campsite = new Campsite(); campsite.setName(cursor.getString(1)); campsite.setCity(cursor.getString(2)); campsite.setFeature(cursor.getString(3)); campsite.setFavorite(cursor.getString(4)); campsite.setRating(cursor.getInt(5)); campsite.setLatitude(cursor.getDouble(6)); campsite.setLongitude(cursor.getDouble(7)); campsites.add(campsite); } } cursor.close(); db.close(); return campsites;}我有一個(gè)名為“瀏覽”的活動(dòng)，它在布局文件中包含 ListView。我還有一個(gè) browser_row_layout ，它具有一行/露營(yíng)地的布局。因此，在 Browse.java 中，我需要?jiǎng)?chuàng)建適配器來(lái)顯示每個(gè)露營(yíng)地。注意：我僅在列表視圖中顯示 3 個(gè)特定列（名稱、城市、功能）因此，我有 Activity_browse 布局文件，其中包含實(shí)際的 ListView 元素和 browser_row_layout，它代表數(shù)據(jù)庫(kù)的 1 行，并且僅包含其中 3 列的 TextView。到目前為止我所擁有的：import android.os.Bundle;import android.widget.ListView;import androidx.appcompat.app.AppCompatActivity;import java.util.ArrayList;public class Browse extends AppCompatActivity {ListView lvCampsites;@Overrideprotected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_browse); lvCampsites= findViewById(R.id.lvCampsites); DatabaseHandler db = new DatabaseHandler(this); ArrayList<Campsite> campsites = db.getAllCampsites();}}TLDR：如何使用 ListView 創(chuàng)建一個(gè)適配器來(lái)顯示露營(yíng)地列表中的每個(gè)露營(yíng)地，其中包含數(shù)據(jù)庫(kù)的每一行。
2 回答
慕尼黑的夜晚無(wú)繁華
TA貢獻(xiàn)1864條經(jīng)驗(yàn) 獲得超6個(gè)贊
創(chuàng)建一個(gè)擴(kuò)展 BaseAdapter 的自定義適配器類，然后實(shí)現(xiàn)方法，然后在 getView 方法中將布局 id 傳遞給視圖，以便您可以訪問(wèn)布局文件中的 textview。
public class CampsitesListAdapter extends BaseAdapter {
private Context mContext;
private ArrayList<Campsites> list;
public CampsitesListAdapter(Context mContext , List<Campsites> countries) {
this.mContext = mContext;
this.list = countries;
}
@Override
public int getCount() {
return list.size();
}
@Override
public Object getItem(int position) {
return list.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View view = View.inflate(mContext, R.layout.campsite_layout , null );
TextView name = (TextView) view.findViewById(R.id.nametxt);
Textview city = (Textview) view.findViewById(R.id.citytxt);
Textview feature = (Textview) view.findViewById(R.id.featuretxt);
name.setText(list.get(position).getname());
city.setText(list.get(position).getcity());
feature.setText(list.get(position).getfeature());
return view;
}
}
這是您的列表視圖活動(dòng)
import android.os.Bundle;
import android.widget.ListView;
import androidx.appcompat.app.AppCompatActivity;
import java.util.ArrayList;
public class Browse extends AppCompatActivity {
ListView lvCampsites;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_browse);
lvCampsites= findViewById(R.id.lvCampsites);
DatabaseHandler db = new DatabaseHandler(this);
ArrayList<Campsite> campsites = db.getAllCampsites();
//Instance of custom adapter
CampsitesListAdapter adapter = new CampsitesListAdapter(this , campsites);
//Setting adapter to listview
lvCampsites.setAdapter(adapter);
}
我希望這可以幫助你。
喵喔喔
TA貢獻(xiàn)1735條經(jīng)驗(yàn) 獲得超5個(gè)贊
您需要先移動(dòng)光標(biāo)。參考下面的代碼：
if (cursor!=null && cursor.getCount()> 0){
cursor.moveToFirst();
do{
Campsite campsite = new Campsite();
campsite.setName(cursor.getString(1));
campsite.setCity(cursor.getString(2));
campsite.setFeature(cursor.getString(3));
campsite.setFavorite(cursor.getString(4));
campsite.setRating(cursor.getInt(5));
campsite.setLatitude(cursor.getDouble(6));
campsite.setLongitude(cursor.getDouble(7));
campsites.add(campsite);
}while(cursor.moveToNext);
}
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