从一个列表视图发送一行到另一个列表视图 [英] send a row from one listview to another listview
本文介绍了从一个列表视图发送一行到另一个列表视图的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我在同一活动中有两个列表视图，其中一个包含元素，另一个为空，我想通过长按将任何元素发送到第二个lisview，我希望这些元素的作用与第一个相同listview(打开一个活动)这是我的代码，请告诉我该怎么做:
i have two listviews in the same activity one of them have elements the other one is empty and i want to send any element to the second lisview by long click and i want the elements to do the same as it is in the first listview(open an activity) here is my code and please tell what to do:
MainActivity.java
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.Toast;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity {
private static final String TAG = "MainActivity";
DB_Sqlite db = new DB_Sqlite(this);
ListView listView1;
ListView listView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listView = (ListView) findViewById(R.id.list_view);
listView1 = (ListView) findViewById(R.id.list_view1);
final ArrayList arrayList = new ArrayList<String>();
arrayList.add("Complex Complex");
arrayList.add("Trix Complex");
arrayList.add("Kingdoms");
final ArrayList arrayList1 = new ArrayList<String>();
final ListAdapter adapter = new ArrayAdapter<>(MainActivity.this,android.R.layout.simple_list_item_1,arrayList);
listView.setAdapter(adapter);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int position, long l) {
if (position == 0){
Intent intent = new Intent(MainActivity.this,cc.class);
startActivity(intent);
}
if (position == 1){
Intent intent = new Intent(MainActivity.this,tc.class);
startActivity(intent);
}
if (position == 2){
Intent intent = new Intent(MainActivity.this,k.class);
startActivity(intent);
}
}
});
listView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
@Override
public boolean onItemLongClick(AdapterView<?> adapterView, View view, int position, long l) {
if (position == 0) {
Boolean result = db.insertData((String) arrayList.get(position));
if (result == true){
Toast.makeText(MainActivity.this,"Added To Favorite",Toast.LENGTH_SHORT).show();
}else{
Toast.makeText(MainActivity.this, "Already Exist", Toast.LENGTH_SHORT).show();
}
}
if (position == 1){
Toast.makeText(MainActivity.this, "TC Added to Favorites", Toast.LENGTH_SHORT).show();
}
if (position == 2){
Toast.makeText(MainActivity.this, "K Added to Favorites", Toast.LENGTH_SHORT).show();
}
return true;
}
});
}
public void showData(){
ArrayList arrayList1 = db.getAllrecord();
final ListAdapter adapter1 = new ArrayAdapter<>(MainActivity.this,android.R.layout.simple_list_item_1,arrayList1);
listView1.setAdapter(adapter1);
}
}
this is what i have done so far please help, thank you very much.
DB_Sqlite.java
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import androidx.annotation.Nullable;
import java.util.ArrayList;
public class DB_Sqlite extends SQLiteOpenHelper {
public static final String BDname = "data.db";
public DB_Sqlite(@Nullable Context context) {
super(context, BDname, null, 1);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("create table mytable (id INTEGER PRIMARY KEY AUTOINCREMENT, name TEXT)");
}
@Override
public void onUpgrade(SQLiteDatabase db, int i, int i1) {
db.execSQL("DROP TABLE IF EXISTS mytable");
onCreate(db);
}
public boolean insertData(String name){
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put("name", name);
long result = db.insert("mytable",null, contentValues);
if (result == -1)
return false;
else
return true;
}
public ArrayList getAllrecord(){
ArrayList arrayList = new ArrayList();
SQLiteDatabase db = this.getReadableDatabase();
Cursor res = db.rawQuery("select * from mytable",null);
res.moveToFirst();
while (res.isAfterLast()==false){
String t1 = res.getString(0);
arrayList.add(t1+" - ");
res.moveToNext();
}
return arrayList;
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity"
android:background="#f2f2f2"
android:orientation="vertical">
<TextView
android:id="@+id/tv1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="25sp"
android:textColor="@color/colorAccent"
android:text="Favorite List:">
</TextView>
<ListView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/list_view1"
android:layout_below="@+id/tv1"
android:divider="@color/colorPrimary"
android:dividerHeight="1dp"
android:layout_weight="1">
</ListView>
<TextView
android:id="@+id/tv"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="25sp"
android:textColor="@color/colorAccent"
android:layout_weight="0"
android:text="Game List:"
android:layout_below="@+id/list_view1">
</TextView>
<ListView
android:id="@+id/list_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/tv"
android:layout_weight="2"
android:divider="@color/colorPrimary"
android:dividerHeight="1dp"
android:layout_alignParentBottom="true"
>
</ListView>
</LinearLayout>
这是我到目前为止所做的，请提前帮助我.
this is what i have done so far please help me thank you in advance.
推荐答案
以下内容应做您想做的(假设通过Send to意味着移至):-
The following should do what you want (assuming that by Send to means move to) :-
public class MainActivity extends AppCompatActivity {
private static final String TAG = "MainActivity";
DB_Sqlite db = new DB_Sqlite(this);
ListView listView1;
ListView listView;
ArrayAdapter<String> adapter, adapter1; /* changed to use ArrayAdapter */
ArrayList<String> arrayList,arrayList1; /* moved (not necessary) */
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listView = (ListView) findViewById(R.id.list_view);
listView1 = (ListView) findViewById(R.id.list_view1);
arrayList = new ArrayList<String>();
arrayList.add("Complex Complex");
arrayList.add("Trix Complex");
arrayList.add("Kingdoms");
arrayList1 = new ArrayList<String>();
adapter = new ArrayAdapter<>(MainActivity.this,android.R.layout.simple_list_item_1,arrayList);
listView.setAdapter(adapter);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int position, long l) {
if (position == 0){
Intent intent = new Intent(MainActivity.this,cc.class);
startActivity(intent);
}
if (position == 1){
Intent intent = new Intent(MainActivity.this,tc.class);
startActivity(intent);
}
if (position == 2){
Intent intent = new Intent(MainActivity.this,k.class);
startActivity(intent);
}
}
});
listView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
@Override
public boolean onItemLongClick(AdapterView<?> adapterView, View view, int position, long l) {
if (position == 0) {
Boolean result = db.insertData((String) arrayList.get(position));
if (result == true){
Toast.makeText(MainActivity.this,"Added To Favorite",Toast.LENGTH_SHORT).show();
}else{
Toast.makeText(MainActivity.this, "Already Exist", Toast.LENGTH_SHORT).show();
}
}
if (position == 1){
Toast.makeText(MainActivity.this, "TC Added to Favorites", Toast.LENGTH_SHORT).show();
}
if (position == 2){
Toast.makeText(MainActivity.this, "K Added to Favorites", Toast.LENGTH_SHORT).show();
}
/*<<<<< the core code that was added >>>>>*/
arrayList1.add(arrayList.get(position));
arrayList.remove(position);
adapter1.notifyDataSetChanged();
adapter.notifyDataSetChanged();
return true;
}
});
/* added */
adapter1 = new ArrayAdapter<>(this,android.R.layout.simple_list_item_1,arrayList1);
listView1.setAdapter(adapter1);
}
public void showData(){
ArrayList arrayList1 = db.getAllrecord();
final ListAdapter adapter1 = new ArrayAdapter<>(MainActivity.this,android.R.layout.simple_list_item_1,arrayList1);
listView1.setAdapter(adapter1);
}
}
结果
- 第一个ListView的背景为蓝色，另一个Listview的背景为绿色，从而可以将一个与另一个区分开.
评论:-
@AhmedZaqout大致需要做的是a)将一列添加为 哪个清单的指示符favourite_flag整数默认值0 b) 用初始值(Kingdons等)填充数据库，而不是定义 ArrayList中的值.活动开始时提取值 根据指标列分为2个列表.如果项目在第一个 长按可更新行以设置指标，然后刷新 列表.
@AhmedZaqout roughly what you need to do is a) add a column as an inidcator of which list e.g. favourite_flag INTEGER DEFAULT 0 b) populate DB with initial values (Kingdons etc) instead of defining the values in an ArrayList. When the activity starts extract the values into the 2 lists according to the indicator column. If item in first is Long clicked update the row to set the indicator then refresh the lists.
然后考虑以下问题:-
public class DB_Sqlite extends SQLiteOpenHelper {
public static final String BDname = "data.db";
public static final int DBVERSION = 1; /*<<<<< ADDED BUT NOT NEEDED */
public static final String TABLE_FAVOURITES = "mytable";
public static final String FAVOURITES_COL_ID = BaseColumns._ID; /*<<<< use the Android stock ID name*/
public static final String FAVOURITES_COL_NAME = "name";
public static final String FAVOURITES_COL_FAVOURITEFLAG = "favourite_flag"; /*<<<<< NEW COLUMN */
public DB_Sqlite(@Nullable Context context) {
super(context, BDname, null, DBVERSION /*<<<<< used constant above */);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("create table " + TABLE_FAVOURITES + " (" +
FAVOURITES_COL_ID + " INTEGER PRIMARY KEY," + /*<<<<< AUTOINCREMENT NOT NEEDED AND IS INEFFICIENT */
FAVOURITES_COL_NAME + " TEXT, " +
FAVOURITES_COL_FAVOURITEFLAG + " INTEGER DEFAULT 0" + /*<<<<< COLUMN ADDED */
")");
/*<<<<< Add initial data */
/* Note indicator will set to non_favourite i.e. 0 */
ContentValues cv = new ContentValues();
cv.put(FAVOURITES_COL_NAME,"Complex Complex");
db.insert(TABLE_FAVOURITES,null,cv);
cv.clear();
cv.put(FAVOURITES_COL_NAME,"Trix Complex");
db.insert(TABLE_FAVOURITES,null,cv);
cv.clear();
cv.put(FAVOURITES_COL_NAME,"Kingdoms");
db.insert(TABLE_FAVOURITES,null,cv);
}
@Override
public void onUpgrade(SQLiteDatabase db, int i, int i1) {
db.execSQL("DROP TABLE IF EXISTS " + TABLE_FAVOURITES);
onCreate(db);
}
public boolean insertData(String name){
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put(FAVOURITES_COL_NAME, name);
long result = db.insert(TABLE_FAVOURITES,null, contentValues);
if (result == -1)
return false;
else
return true;
}
/*<<<<< ADDEDD */
public Cursor getFavouriteRows(boolean favourites /* true to return favourites (listView 2), false to return non-favourites (ListView 1) */) {
SQLiteDatabase db = this.getWritableDatabase();
String whereclause = FAVOURITES_COL_FAVOURITEFLAG + "=?";
String compare = "<1";
if (favourites) {
compare =">0";
}
return db.query(
TABLE_FAVOURITES,null,
FAVOURITES_COL_FAVOURITEFLAG + compare,
null,null,null,null
);
}
/*<<<<< ADDEDD */
private int setFavourite(long id, boolean favourite_flag) {
SQLiteDatabase db = this.getWritableDatabase();
String whereclause = FAVOURITES_COL_ID + "=?";
String[] whereargs = new String[]{String.valueOf(id)};
ContentValues cv = new ContentValues();
cv.put(FAVOURITES_COL_FAVOURITEFLAG,favourite_flag);
return db.update(TABLE_FAVOURITES,cv,whereclause,whereargs);
}
/*<<<<< ADDEDD */
public int setAsFavourite(long id) {
return setFavourite(id,true);
}
/*<<<<< ADDEDD */
public int setAsNotFavourite(long id) {
return setFavourite(id, false);
}
/* Will be unused */
public ArrayList getAllrecord(){
ArrayList arrayList = new ArrayList();
SQLiteDatabase db = this.getReadableDatabase();
Cursor res = db.rawQuery("select * from mytable",null);
res.moveToFirst();
while (res.isAfterLast()==false){
String t1 = res.getString(0);
arrayList.add(t1+" - ");
res.moveToNext();
}
return arrayList;
}
}
MainActivity.java
public class MainActivity extends AppCompatActivity {
private static final String TAG = "MainActivity";
DB_Sqlite db = new DB_Sqlite(this);
ListView listView1, listView;
//ArrayAdapter<String> adapter, adapter1; /*<<<<< commented out as unused */
//ArrayList<String> arrayList,arrayList1; /*<<<<< commented out as unused */
Cursor non_favourites_cursor, favourites_cursor; //<<<<< Added as goind to use Cursor Adapter */
SimpleCursorAdapter non_favourites_adapter, favourites_adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listView = (ListView) findViewById(R.id.list_view);
listView1 = (ListView) findViewById(R.id.list_view1);
manageBothListViews();
//arrayList = new ArrayList<String>();
//arrayList.add("Complex Complex");
//arrayList.add("Trix Complex");
//arrayList.add("Kingdoms");
//arrayList1 = new ArrayList<String>();
//adapter = new ArrayAdapter<>(MainActivity.this,android.R.layout.simple_list_item_1,arrayList);
//listView.setAdapter(adapter);
/*
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int position, long l) {
if (position == 0){
Intent intent = new Intent(MainActivity.this,cc.class);
startActivity(intent);
}
if (position == 1){
Intent intent = new Intent(MainActivity.this,tc.class);
startActivity(intent);
}
if (position == 2){
Intent intent = new Intent(MainActivity.this,k.class);
startActivity(intent);
}
}
});
listView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
@Override
public boolean onItemLongClick(AdapterView<?> adapterView, View view, int position, long l) {
if (position == 0) {
Boolean result = db.insertData((String) arrayList.get(position));
if (result == true){
Toast.makeText(MainActivity.this,"Added To Favorite",Toast.LENGTH_SHORT).show();
}else{
Toast.makeText(MainActivity.this, "Already Exist", Toast.LENGTH_SHORT).show();
}
}
if (position == 1){
Toast.makeText(MainActivity.this, "TC Added to Favorites", Toast.LENGTH_SHORT).show();
}
if (position == 2){
Toast.makeText(MainActivity.this, "K Added to Favorites", Toast.LENGTH_SHORT).show();
}
arrayList1.add(arrayList.get(position));
arrayList.remove(position);
adapter1.notifyDataSetChanged();
adapter.notifyDataSetChanged();
return true;
}
});
adapter1 = new ArrayAdapter<>(this,android.R.layout.simple_list_item_1,arrayList1);
listView1.setAdapter(adapter1);
*/
}
@Override
protected void onDestroy() {
super.onDestroy();
non_favourites_cursor.close();
favourites_cursor.close();
}
@Override
protected void onResume() {
super.onResume();
manageBothListViews();
}
public void showData(){
ArrayList arrayList1 = db.getAllrecord();
final ListAdapter adapter1 = new ArrayAdapter<>(MainActivity.this,android.R.layout.simple_list_item_1,arrayList1);
listView1.setAdapter(adapter1);
}
private void manageBothListViews() {
manageNonFavouritesListView();
manageFavouritesListView();
}
private void manageNonFavouritesListView() {
non_favourites_cursor = db.getFavouriteRows(false);
if (non_favourites_adapter == null) {
non_favourites_adapter = new SimpleCursorAdapter(
this,
android.R.layout.simple_list_item_1,
non_favourites_cursor,
new String[]{DB_Sqlite.FAVOURITES_COL_NAME},
new int[]{android.R.id.text1},
0
);
listView.setAdapter(non_favourites_adapter);
setListViewHandler(listView,false);
} else {
non_favourites_adapter.swapCursor(non_favourites_cursor);
}
}
private void manageFavouritesListView() {
favourites_cursor = db.getFavouriteRows(true);
if (favourites_adapter == null) {
favourites_adapter = new SimpleCursorAdapter(
this,
android.R.layout.simple_list_item_1,
favourites_cursor,
new String[]{DB_Sqlite.FAVOURITES_COL_NAME},
new int[]{android.R.id.text1},
0
);
listView1.setAdapter(favourites_adapter);
setListViewHandler(listView1,true);
} else {
favourites_adapter.swapCursor(favourites_cursor);
}
}
private void setListViewHandler(ListView lv, boolean favourite_flag) {
if (!favourite_flag) {
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
if (non_favourites_cursor.getString(non_favourites_cursor.getColumnIndex(DB_Sqlite.FAVOURITES_COL_NAME)).equals("Complex Complex")) {
Intent intent = new Intent(MainActivity.this,cc.class);
startActivity(intent);
}
if (non_favourites_cursor.getString(non_favourites_cursor.getColumnIndex(DB_Sqlite.FAVOURITES_COL_NAME)).equals("Trix Complex")) {
Intent intent = new Intent(MainActivity.this,tc.class);
startActivity(intent);
}
if (non_favourites_cursor.getString(non_favourites_cursor.getColumnIndex(DB_Sqlite.FAVOURITES_COL_NAME)).equals("Kingdoms")){
Intent intent = new Intent(MainActivity.this,k.class);
startActivity(intent);
}
}
});
lv.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
@Override
public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
db.setAsFavourite(id);
manageBothListViews();
return true;
}
});
} else {
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
if (favourites_cursor.getString(favourites_cursor.getColumnIndex(DB_Sqlite.FAVOURITES_COL_NAME)).equals("Complex Complex")) {
Intent intent = new Intent(MainActivity.this,cc.class);
startActivity(intent);
}
if (favourites_cursor.getString(favourites_cursor.getColumnIndex(DB_Sqlite.FAVOURITES_COL_NAME)).equals("Trix Complex")) {
Intent intent = new Intent(MainActivity.this,tc.class);
startActivity(intent);
}
if (favourites_cursor.getString(favourites_cursor.getColumnIndex(DB_Sqlite.FAVOURITES_COL_NAME)).equals("Kingdoms")){
Intent intent = new Intent(MainActivity.this,k.class);
startActivity(intent);
}
}
});
}
}
}
- 查看评论
- 这使用CursorAdapter而不是ArrayAdapter.
- 这将在创建数据库时使用存储在数据库中的值(名称Kingdoms等).因此，您应该在运行更改后的代码之前卸载应用程序或删除应用程序的数据.
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