ON/OFF Arrayadapter 的 getView() 方法调用中的切换按钮 [使用 SQLite table 值] 来调用列表视图？
ON/OFF Switch button [using SQLite table values] in Arrayadapter's getView() method call for a Listview?
问题： 到 enable/disable Listview 上的切换按钮加载关于显示的每一行的 table 中存储的“是”和“否”值.在这个问题上花了一个星期。 SO 也没有适当的解决方案来为 getView() 方法显示的项目行启用 ON/OFF 的开关值。
到目前为止，已完成： 从 (SQLite Table) 中查询了所有值为“是”的项目的 ICODE，并添加到单独的 Arraylist 中，并为所有“是”中的值，试图 enable/disable 在列表视图的相应行中切换 [Arrayadapter 实现]。
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Locale;
public class Ecs extends ListActivity {
public static ArrayList<String> firstList ;
public static ArrayList<String> swlist ;
TextView searchtext;
Con control = new Con(this);
}
public static class Apache extends ArrayAdapter<HashMap<String, String>> {
public static final String DN = "DN";// 0 text(String)
public static ArrayList<String> noon ;
public ArrayList<HashMap<String, String>> firstList;
Activity activity;
public Apache(Activity activity, ArrayList<HashMap<String, String>> firstList) {
super(activity, R.layout.simple, firstList);
this.activity = activity;
this.firstList = firstList;
}
@Override
public int getCount() {
return firstList.size();
}
@Override
public HashMap<String, String> getItem(int position) {
return Ecs.firstList.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
final HashMap<String, String> map = firstList.get(position);
final ItemViewHolder viewHolder;
final int pos = position;
if (convertView == null) {
LayoutInflater layoutInflater = (LayoutInflater)
this.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = layoutInflater.inflate(R.layout.fisrtlay, parent, false);
viewHolder = new ItemViewHolder();
viewHolder.TDD = (TextView)
convertView.findViewById(R.id.txtdnno);
viewHolder.SWW = (Switch) convertView.findViewById(R.id.sw);
convertView.setTag(viewHolder);
} else {
viewHolder = (ItemViewHolder) convertView.getTag();
}
viewHolder.TDD.setText(map.get(DN));
viewHolder.SWW.setText(map.get(TYPE));
viewHolder.SWW.setChecked(false);
viewHolder.SWW.setTag("SWITCH");
if (noon.contains(firstList.get(pos).get(ICODE))) {
viewHolder.SWW.setChecked(true);
}
viewHolder.SWW.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String title = v.getTag().toString();
if (title.equals("SWITCH")) {
//if (viewHolder.SWW.getText().toString().trim().equals("Yes"))
if (viewHolder.SWW.isChecked()) {
noon.add(firstList.get(pos).get(ICODE));
} else {
if (noon.contains(firstList.get(pos).get(ICODE))) {
noon.remove(firstList.get(pos).get(ICODE));
}
}
}
}
});
notifyDataSetChanged();
return convertView;
}
public class ItemViewHolder {
TextView TDD;
Switch SWW;
}
}
}
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"
xmlns:tools="http://schemas.android.com/tools"
android:descendantFocusability="blocksDescendants"
android:orientation="vertical" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<LinearLayout
android:id="@+id/lvh"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#ffe6e6e6"
android:minHeight="50dp"
android:orientation="horizontal"
android:scrollbarSize="5dp"
android:scrollbars="horizontal"
android:weightSum="5"
android:focusable="true">
<TextView
android:id="@+id/txtdnno"
android:layout_width="22dp"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_weight="1"
android:gravity="center"
android:padding="3dp"
android:text="DNNO"
android:textColor="#000000"
android:textSize="12sp" />
<RadioGroup
android:layout_width="14dp"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_weight="1"
android:gravity="center"
android:orientation="vertical"
android:padding="3dp">
<Switch
android:id="@+id/sw"
android:layout_width="45dp"
android:layout_height="21dp"
android:layout_gravity="center"
android:focusable="false"
android:gravity="center"
android:onClick="switchClicked"
android:shadowColor="#FFFFFF"
android:textOff="@string/no"
android:textOn="@string/yes"
android:textSize="12sp" />
</RadioGroup>
</LinearLayout>
</LinearLayout>
</LinearLayout>
如果您的noon和firstList包含这样的数据
noon.add("123");
firstList.add(new HashMap<>().put(ICODE, "123"));
firstList.add(new HashMap<>().put(ICODE, "321"));
firstList.add(new HashMap<>().put(ICODE, "32"));
那么您的代码应该可以工作，对于第一个项目，它将是 Yes，对于其他 2 个 No。
关注：
方法调用 [Yesvalues]，它查询并保存来自 table 的 [swlist] 中的所有“Yes”值，并在用户与显示的 Listview 交互时添加未来“Yes”值的记录。
检查行位置 [pos]，获取该行的 ICODE 并与 [swlist] 交叉检查到 enable/disable 该行的切换按钮。 getView() 方法将对每个行项目及其旁边的开关执行相同的操作。
当用户交互 [切换 OnClickListener / 保存 OnClickListener] 时，在保存时记录或删除“是”。
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Locale;
public class Ecs extends ListActivity {
public static ArrayList<String> firstList ;
public static ArrayList<String> swlist ;
TextView searchtext;
Con control = new Con(this);
private void DNat() {
if (searchtext.getText().toString().length() > 3) {
swlist = control.Yesvalues(searchtext.getText().toString()); /// STEP 1
firstList = control.Sear(searchtext.getText().toString());
if (myList.size() != 0) {
lv = getListView();
adapter = new Apache(Ecs.this, firstList, swlist);
lv.setAdapter(adapter);
control.close();
}
}
}
}
public static class Apache extends ArrayAdapter<HashMap<String, String>> {
public static final String DN = "DN";// 0 text(String)
public static ArrayList<String> noon ;
public ArrayList<HashMap<String, String>> firstList;
Activity activity;
public Apache(Activity activity, ArrayList<HashMap<String, String>> firstList, ArrayList<HashMap<String, String>> swlist){
super(activity, R.layout.simple, firstList);
this.activity = activity;
this.firstList = firstList;
this.noon = swlist;
}
@Override
public int getCount() {
return firstList.size();
}
@Override
public HashMap<String, String> getItem(int position) {
return Ecs.firstList.get(position);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
final HashMap<String, String> map = myList.get(position);
final ItemViewHolder viewHolder;
final int pos = position;
if (convertView == null) {
LayoutInflater layoutInflater = (LayoutInflater) this.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = layoutInflater.inflate(R.layout.simple, parent, false);
viewHolder = new ItemViewHolder();
viewHolder.TDD = (TextView) convertView.findViewById(R.id.txtdnno);
viewHolder.SWW = (Switch) convertView.findViewById(R.id.sw);
convertView.setTag(viewHolder);
} else {
viewHolder = (ItemViewHolder) convertView.getTag();
}
viewHolder.TDD.setText(map.get(DN));
viewHolder.SWW.setText(map.get(TYPE));
viewHolder.SWW.setChecked(false);
viewHolder.SWW.setTag("SWITCH");
final HashMap<String, String> tyes = new HashMap<String, String>(); ///STEP 2
tyes.put(DDN, myList.get(pos).get(DN));
tyes.put(IICODE, myList.get(pos).get(ICODE));
if (noon.contains(tyes) {
viewHolder.SWW.setChecked(true);
}
viewHolder.SWW.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String title = v.getTag().toString();
if (title.equals("SWITCH")) { /// STEP 3
if (viewHolder.SWW.isChecked()) {
noon.add(tyes);
} else {
if (noon.contains(tyes) && viewHolder.SWW.getText().equals("No")) {
noon.remove(tyes);
}
}
}
}
});
notifyDataSetChanged();
return convertView;
}
public class ItemViewHolder {
TextView TDD;
Switch SWW;
}
}
查询所有记录为YES的开关：
public class Con extends AppCompatActivity {
public Con() {}
public ArrayList<HashMap<String, String>> Yesvalues(String DN) {
ArrayList<HashMap<String, String>> yeslist;
String Yes="Yes";
yeslist = new ArrayList<HashMap<String, String>>();
int sval=Integer.parseInt(String.valueOf(DN));
String selectQuery = "SELECT DN, ICODE FROM " + Tablename
+ " WHERE DN =" + sval + " AND STYPE = " + "'"+ Yes +"'";
SQLiteDatabase database = dbHelper.getWritableDatabase();
Cursor cursor = database.rawQuery(selectQuery, null);
if (cursor.moveToFirst()) {
do {
HashMap<String, String> yesmap = new HashMap<String, String>();
yesmap.put(DNNO, cursor.getString(0));
yesmap.put(ITEMCODE, cursor.getString(1));
yeslist.add(yesmap);
} while (cursor.moveToNext());
}
return yeslist;
}
}
问题： 到 enable/disable Listview 上的切换按钮加载关于显示的每一行的 table 中存储的“是”和“否”值.在这个问题上花了一个星期。 SO 也没有适当的解决方案来为 getView() 方法显示的项目行启用 ON/OFF 的开关值。
到目前为止，已完成： 从 (SQLite Table) 中查询了所有值为“是”的项目的 ICODE，并添加到单独的 Arraylist 中，并为所有“是”中的值，试图 enable/disable 在列表视图的相应行中切换 [Arrayadapter 实现]。
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Locale;
public class Ecs extends ListActivity {
public static ArrayList<String> firstList ;
public static ArrayList<String> swlist ;
TextView searchtext;
Con control = new Con(this);
}
public static class Apache extends ArrayAdapter<HashMap<String, String>> {
public static final String DN = "DN";// 0 text(String)
public static ArrayList<String> noon ;
public ArrayList<HashMap<String, String>> firstList;
Activity activity;
public Apache(Activity activity, ArrayList<HashMap<String, String>> firstList) {
super(activity, R.layout.simple, firstList);
this.activity = activity;
this.firstList = firstList;
}
@Override
public int getCount() {
return firstList.size();
}
@Override
public HashMap<String, String> getItem(int position) {
return Ecs.firstList.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
final HashMap<String, String> map = firstList.get(position);
final ItemViewHolder viewHolder;
final int pos = position;
if (convertView == null) {
LayoutInflater layoutInflater = (LayoutInflater)
this.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = layoutInflater.inflate(R.layout.fisrtlay, parent, false);
viewHolder = new ItemViewHolder();
viewHolder.TDD = (TextView)
convertView.findViewById(R.id.txtdnno);
viewHolder.SWW = (Switch) convertView.findViewById(R.id.sw);
convertView.setTag(viewHolder);
} else {
viewHolder = (ItemViewHolder) convertView.getTag();
}
viewHolder.TDD.setText(map.get(DN));
viewHolder.SWW.setText(map.get(TYPE));
viewHolder.SWW.setChecked(false);
viewHolder.SWW.setTag("SWITCH");
if (noon.contains(firstList.get(pos).get(ICODE))) {
viewHolder.SWW.setChecked(true);
}
viewHolder.SWW.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String title = v.getTag().toString();
if (title.equals("SWITCH")) {
//if (viewHolder.SWW.getText().toString().trim().equals("Yes"))
if (viewHolder.SWW.isChecked()) {
noon.add(firstList.get(pos).get(ICODE));
} else {
if (noon.contains(firstList.get(pos).get(ICODE))) {
noon.remove(firstList.get(pos).get(ICODE));
}
}
}
}
});
notifyDataSetChanged();
return convertView;
}
public class ItemViewHolder {
TextView TDD;
Switch SWW;
}
}
}
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"
xmlns:tools="http://schemas.android.com/tools"
android:descendantFocusability="blocksDescendants"
android:orientation="vertical" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<LinearLayout
android:id="@+id/lvh"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#ffe6e6e6"
android:minHeight="50dp"
android:orientation="horizontal"
android:scrollbarSize="5dp"
android:scrollbars="horizontal"
android:weightSum="5"
android:focusable="true">
<TextView
android:id="@+id/txtdnno"
android:layout_width="22dp"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_weight="1"
android:gravity="center"
android:padding="3dp"
android:text="DNNO"
android:textColor="#000000"
android:textSize="12sp" />
<RadioGroup
android:layout_width="14dp"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_weight="1"
android:gravity="center"
android:orientation="vertical"
android:padding="3dp">
<Switch
android:id="@+id/sw"
android:layout_width="45dp"
android:layout_height="21dp"
android:layout_gravity="center"
android:focusable="false"
android:gravity="center"
android:onClick="switchClicked"
android:shadowColor="#FFFFFF"
android:textOff="@string/no"
android:textOn="@string/yes"
android:textSize="12sp" />
</RadioGroup>
</LinearLayout>
</LinearLayout>
</LinearLayout>
如果您的noon和firstList包含这样的数据
noon.add("123");
firstList.add(new HashMap<>().put(ICODE, "123"));
firstList.add(new HashMap<>().put(ICODE, "321"));
firstList.add(new HashMap<>().put(ICODE, "32"));
那么您的代码应该可以工作，对于第一个项目，它将是 Yes，对于其他 2 个 No。
关注：
方法调用 [Yesvalues]，它查询并保存来自 table 的 [swlist] 中的所有“Yes”值，并在用户与显示的 Listview 交互时添加未来“Yes”值的记录。
检查行位置 [pos]，获取该行的 ICODE 并与 [swlist] 交叉检查到 enable/disable 该行的切换按钮。 getView() 方法将对每个行项目及其旁边的开关执行相同的操作。
当用户交互 [切换 OnClickListener / 保存 OnClickListener] 时，在保存时记录或删除“是”。
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Locale;
public class Ecs extends ListActivity {
public static ArrayList<String> firstList ;
public static ArrayList<String> swlist ;
TextView searchtext;
Con control = new Con(this);
private void DNat() {
if (searchtext.getText().toString().length() > 3) {
swlist = control.Yesvalues(searchtext.getText().toString()); /// STEP 1
firstList = control.Sear(searchtext.getText().toString());
if (myList.size() != 0) {
lv = getListView();
adapter = new Apache(Ecs.this, firstList, swlist);
lv.setAdapter(adapter);
control.close();
}
}
}
}
public static class Apache extends ArrayAdapter<HashMap<String, String>> {
public static final String DN = "DN";// 0 text(String)
public static ArrayList<String> noon ;
public ArrayList<HashMap<String, String>> firstList;
Activity activity;
public Apache(Activity activity, ArrayList<HashMap<String, String>> firstList, ArrayList<HashMap<String, String>> swlist){
super(activity, R.layout.simple, firstList);
this.activity = activity;
this.firstList = firstList;
this.noon = swlist;
}
@Override
public int getCount() {
return firstList.size();
}
@Override
public HashMap<String, String> getItem(int position) {
return Ecs.firstList.get(position);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
final HashMap<String, String> map = myList.get(position);
final ItemViewHolder viewHolder;
final int pos = position;
if (convertView == null) {
LayoutInflater layoutInflater = (LayoutInflater) this.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = layoutInflater.inflate(R.layout.simple, parent, false);
viewHolder = new ItemViewHolder();
viewHolder.TDD = (TextView) convertView.findViewById(R.id.txtdnno);
viewHolder.SWW = (Switch) convertView.findViewById(R.id.sw);
convertView.setTag(viewHolder);
} else {
viewHolder = (ItemViewHolder) convertView.getTag();
}
viewHolder.TDD.setText(map.get(DN));
viewHolder.SWW.setText(map.get(TYPE));
viewHolder.SWW.setChecked(false);
viewHolder.SWW.setTag("SWITCH");
final HashMap<String, String> tyes = new HashMap<String, String>(); ///STEP 2
tyes.put(DDN, myList.get(pos).get(DN));
tyes.put(IICODE, myList.get(pos).get(ICODE));
if (noon.contains(tyes) {
viewHolder.SWW.setChecked(true);
}
viewHolder.SWW.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String title = v.getTag().toString();
if (title.equals("SWITCH")) { /// STEP 3
if (viewHolder.SWW.isChecked()) {
noon.add(tyes);
} else {
if (noon.contains(tyes) && viewHolder.SWW.getText().equals("No")) {
noon.remove(tyes);
}
}
}
}
});
notifyDataSetChanged();
return convertView;
}
public class ItemViewHolder {
TextView TDD;
Switch SWW;
}
}
查询所有记录为YES的开关：
public class Con extends AppCompatActivity {
public Con() {}
public ArrayList<HashMap<String, String>> Yesvalues(String DN) {
ArrayList<HashMap<String, String>> yeslist;
String Yes="Yes";
yeslist = new ArrayList<HashMap<String, String>>();
int sval=Integer.parseInt(String.valueOf(DN));
String selectQuery = "SELECT DN, ICODE FROM " + Tablename
+ " WHERE DN =" + sval + " AND STYPE = " + "'"+ Yes +"'";
SQLiteDatabase database = dbHelper.getWritableDatabase();
Cursor cursor = database.rawQuery(selectQuery, null);
if (cursor.moveToFirst()) {
do {
HashMap<String, String> yesmap = new HashMap<String, String>();
yesmap.put(DNNO, cursor.getString(0));
yesmap.put(ITEMCODE, cursor.getString(1));
yeslist.add(yesmap);
} while (cursor.moveToNext());
}
return yeslist;
}
}