这是我的示例代码，用于编辑每一行以及列表视图的数据库，希望对您有所帮助
首先创建我创建一个适配器名称“ListAdapterItem.java”
import java.util.ArrayList;
import java.util.HashMap;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.RelativeLayout;
import android.widget.TextView;
public class ListAdapterItem extends BaseAdapter {
private ArrayList<HashMap<String, Object>> list;
private Context context;
private RelativeLayout ll;
// used to keep selected position in ListView
private int selectedPos = -1; // init value for not-selected
private TextView label,label_id;
String name,id;
public ListAdapterItem (Context context,ArrayList<HashMap<String, Object>> list) {
this.list = list;
this.context = context;
}
public void setSelectedPosition(int pos) {
selectedPos = pos;
// inform the view of this change
notifyDataSetChanged();
}
public int getSelectedPosition() {
return selectedPos;
}
public View getView(int position, View convertView, ViewGroup parent) {
ll = (RelativeLayout) LayoutInflater.from(this.context).inflate(R.layout.data_list_item, null);
// get text view
label = (TextView) ll.findViewById(R.id.txtview_country_name);
label_id=(TextView) ll.findViewById(R.id.txtview_id);
id=list.get(position).get("Id").toString();
name = list.get(position).get("Name").toString();
label.setText(name);
label_id.setText(id);
return ll;
}
public int getCount() {
return this.list.size();
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
}
这是我的 data_list_item
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:padding="5dp">
<TextView
android:id="@+id/txtview_id"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_margin="8dp"
android:layout_marginRight="2dp"
android:textColor="@android:color/black"
android:textSize="22dp"
android:visibility="invisible"/>
<TextView
android:id="@+id/txtview_country_name"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_margin="8dp"
android:layout_marginRight="2dp"
android:textColor="@android:color/black"
android:textSize="22dp" />
</RelativeLayout>
和主类“Main.java”
public class Main extends Activity implements OnClickListener {
String name;
SQLiteDatabase db;
Cursor cursor;
private ProgressDialog progressDialog;
public ListAdapterItem list_adapter;
private ArrayList<HashMap<String, Object>> lst_data;
private HashMap<String, Object> hm;
private ListView listview;
private String list_id;
private int counter_id,selectedPosition;
private View selectedView;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main_layout);
lst_data = new ArrayList<HashMap<String, Object>>();
listview = (ListView) findViewById(R.id.list);
new FetchDB().execute();
}
private class FetchDB extends AsyncTask<String, Void,ArrayList<HashMap<String, Object>>> {
protected void onPreExecute() {
progressDialog = ProgressDialog.show(Main.this,"Fetching Data", "Loading,Please wait...", true);
}
protected ArrayList<HashMap<String, Object>> doInBackground(String... lstStrings)throws IllegalArgumentException {
try {
db = openOrCreateDatabase("MyDB", MODE_PRIVATE, null);
cursor = db.rawQuery("SELECT * FROM person WHERE Id <> ''",null);
if (cursor != null && cursor.getCount() > 0) {
if (cursor.moveToFirst()) {
do {
hm = new HashMap<String, Object>();
hm.put("Id",cursor.getInt(cursor.getColumnIndex("Id")));
hm.put("Name", cursor.getString(cursor.getColumnIndex("Name")));
lst_data.add(hm);
} while (cursor.moveToNext());
}// end of cursor.moveToFirst()
cursor.close();
}
} catch (Exception e) {
e.getMessage();
}
db.close();// database close
return lst_data;
}// end of doInbackgournd
@Override
protected void onPostExecute(ArrayList<HashMap<String, Object>> result) {
progressDialog.dismiss();
list_adapter = new ListAdapterItem(Main.this,result);
listview.setAdapter(list_adapter);
listview.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,long arg3) {
list_adapter.setSelectedPosition(arg2);
selectedPosition = arg2;
selectedView = arg1;
list_id=((TextView) selectedView.findViewById(R.id.txtview_id)).getText().toString();
}
});
}
}// end of FetchDBTask
private class SaveTask extends AsyncTask<String, Void,ArrayList<HashMap<String, Object>>> {
@Override
protected void onPreExecute() {
progressDialog = ProgressDialog.show(Main.this,"Saving Data", "Loading,Please wait...", true);
}
protected ArrayList<HashMap<String, Object>> doInBackground(String... arg0)throws IllegalArgumentException {
counter_id++;
name = editext_name.getText().toString();
hm = new HashMap<String, Object>();
hm.put("Id",counter_id);
hm.put("Name",name);
lst_data.add(hm);
saveDB();
return lst_data;
}// end of doInbackgournd
protected void onPostExecute(ArrayList<HashMap<String, Object>> result) {
progressDialog.dismiss();
list_adapter = new ListAdapterItem(Main.this,result);
listview.setAdapter(list_adapter);
listview.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,long arg3) {
list_adapter.setSelectedPosition(arg2);
selectedPosition = arg2;
selectedView = arg1;
list_id=((TextView) selectedView.findViewById(R.id.txtview_id)).getText().toString();
}
});
}
}// end of saveTask
public void saveDB(){
String sql;
db = openOrCreateDatabase("MyDB", MODE_PRIVATE, null);
// create table if not e exist
db.execSQL("CREATE TABLE IF NOT EXISTS person(Name VARCHAR ,Id INT(3));");
sql = "SELECT * FROM person WHERE Id="+list_id; //selected or click row in list item
Cursor cursor = db.rawQuery(sql, null);
if (cursor.moveToFirst()) {
String sqlUpdate = "UPDATE person SET Name=? WHERE Id="+db_id;
db.execSQL(sqlUpdate, new Object[] {db_name});
cursor.close();
db.close();// database close
} else {// empty insert
String sqlInsert = "INSERT INTO person VALUES (?,"+null+")";
db.execSQL(sqlInsert, new Object[] {db_name,db_address,db_phone,db_email,db_license,db_comments,db_company,db_policy,db_phone_insurance,vehc_year,vehc_make,vehc_model,vehc_license,vehc_vinnum,vehc_color,db_position });
cursor.close();
db.close();// database close
}
}
//Edit by row
private class EditData extends AsyncTask<String, Void,ArrayList<HashMap<String, Object>>> {
protected void onPreExecute() {
progressDialog = ProgressDialog.show(Main.this,"Saving Data", "Loading Please wait...", true);
}
protected ArrayList<HashMap<String, Object>> doInBackground(String... id)throws IllegalArgumentException {
name = editext_name.getText().toString();
hm = new HashMap<String, Object>();
hm.put("Id",counter_id);
hm.put("Name",name);
lst_data.set(selectedPosition, hm); //specific row update
list_id=Integer.parseInt(edit_counter);
saveDB();
return lst_data;
}// end of doInbackgournd
protected void onPostExecute(ArrayList<HashMap<String, Object>> result) {
progressDialog.dismiss();
list_adapter = new ListAdapterItem(Main.this,result);
listview.setAdapter(list_adapter);
}
}
}
和 main_layout.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<ListView
android:id="@+id/list"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:background="@android:color/transparent"
android:cacheColorHint="#00000000"
android:dividerHeight="2dp"
android:paddingTop="8dp"
android:transcriptMode="normal" />
</LinearLayout>
在列表视图中的每个列表行中指定您的 ID 希望这能回答您的问题