Android 单击“收藏夹”按钮时更新列表视图
我希望在类Android 单击“收藏夹”按钮时更新列表视图,android,sqlite,listview,notifydatasetchanged,Android,Sqlite,Listview,Notifydatasetchanged,我希望在类ListViewAdapter中单击按钮btn时,更新我的sqlite并更改btn的背景,当MainActivity开始并首先单击按钮时,是正确的。但当我滚动列表时,btn的背景会恢复到其原始状态,此外,当再次单击按钮时,不会进行任何更改。 换句话说,不要更新我的listview。如何解决这个问题 在何处以及如何使用adapter.notifyDataSetChanged() 单击列表视图适配器后?如何在我的ListViewAdapterMyActivity上获取适配器 public
ListViewAdapter
中单击按钮btn
时,更新我的sqlite并更改btn的背景,当MainActivity开始并首先单击按钮时,是正确的。但当我滚动列表时,btn的背景会恢复到其原始状态,此外,当再次单击按钮时,不会进行任何更改。
换句话说,不要更新我的listview。如何解决这个问题
在何处以及如何使用adapter.notifyDataSetChanged()代码>
单击列表视图适配器后
?如何在我的ListViewAdapter
MyActivity上获取适配器
public class ListViewAdapter extends BaseAdapter {
// Declare Variables
Context mContext;
LayoutInflater inflater;
private List<myitems> worldpopulationlist = null;
private ArrayList<myitems> arraylist;
int myfavorit =0;
DataBaseHelper myDbHelper;
SQLiteDatabase db;
Cursor mCursor;
public ListViewAdapter(Context context, List<myitems> worldpopulationlist) {
mContext = context;
this.worldpopulationlist = worldpopulationlist;
inflater = LayoutInflater.from(mContext);
this.arraylist = new ArrayList<myitems>();
this.arraylist.addAll(worldpopulationlist);
}
public class ViewHolder {
TextView rank;
TextView country;
TextView population;
Button btn;
}
@Override
public int getCount() {
return worldpopulationlist.size();
}
@Override
public myitems getItem(int position) {
return worldpopulationlist.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
public View getView(final int position, View view, ViewGroup parent) {
final ViewHolder holder;
if (view == null) {
holder = new ViewHolder();
view = inflater.inflate(R.layout.myitems_list, null);
// Locate the TextViews in listview_item.xml
holder.rank = (TextView) view.findViewById(R.id.txt25);
holder.btn=(Button) view.findViewById(R.id.btnfavor);
holder.country = (TextView) view.findViewById(R.id.txt26);
view.setTag(holder);
} else {
holder = (ViewHolder) view.getTag();
}
holder.rank.setText(worldpopulationlist.get(position).gettitle());
holder.country.setText(worldpopulationlist.get(position).getshomare()+"-");
myfavorit=worldpopulationlist.get(position).getfavoir();
if(myfavorit==0){
holder.btn.setBackgroundResource(R.drawable.ic_launcher);
}
else{
holder.btn.setBackgroundResource(R.drawable.star);
}
holder.btn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
myDbHelper = new DataBaseHelper(mContext.getApplicationContext());
myDbHelper = new DataBaseHelper(mContext);
try {
myDbHelper.createDataBase();}
catch (IOException ioe) {
throw new Error("Unable to create database");
}
try {myDbHelper.openDataBase();}
catch (SQLException sqle) {sqle.printStackTrace();
}
String rr=worldpopulationlist.get(position).getprimaryid();
db = myDbHelper.getWritableDatabase();
switch (worldpopulationlist.get(position).getfavoir()) {
case 0:
mCursor= db.rawQuery("UPDATE khotbe SET favorites = 1 WHERE my_id ="+rr+" ;",null);
mCursor.moveToFirst();
holder.btn.setBackgroundResource(R.drawable.star);
Toast.makeText(mContext, "به لیست علاقه مندی ها اضافه شد", Toast.LENGTH_SHORT).show();
break;
case 1:
mCursor= db.rawQuery("UPDATE khotbe SET favorites = 0 WHERE my_id ="+rr+" ;",null);
mCursor.moveToFirst();
holder.btn.setBackgroundResource(R.drawable.ic_launcher);
Toast.makeText(mContext, "از لیست علاقه مندی های حذف گردید", Toast.LENGTH_SHORT).show();
break;
default:
break;
}
}
});
和主要活动
public class towkhotbe extends ActionBarActivity {
DataBaseHelper myDbHelper;
ListView mylist;
ArrayList<String> iran,arr_intityid,arrshomare,primarykeyarrlist;
String[] fa,mysid,myshomare,primarykeyarr;
SQLiteDatabase db;
Cursor mCursor;
int translate;
EditText mysearch;
int [] favorit;
ArrayList<Integer> favor;
ListViewAdapter adapter;
private DrawerLayout mDrawerLayout;
private ListView mDrawerList;
@SuppressWarnings("deprecation")
private ActionBarDrawerToggle mDrawerToggle;
private CharSequence mDrawerTitle;
private CharSequence mTitle;
android.support.v7.app.ActionBar actionbar;
private ArrayList<NavDrawerItem> navDrawerItems;
private NavDrawerListAdapter sadapter;
@SuppressLint("NewApi")
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.tow_khotbe);
Intent myintent=getIntent();
translate=myintent.getExtras().getInt("translate");
mylist=(ListView)findViewById(R.id.mylist);
mysearch=(EditText)findViewById(R.id.edtxtsearch);
iran=new ArrayList<String>();
arr_intityid=new ArrayList<String>();
arrshomare=new ArrayList<String>();
primarykeyarrlist=new ArrayList<String>();
favor=new ArrayList<Integer>();
}
@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
myDbHelper = new DataBaseHelper(this.getApplicationContext());
myDbHelper = new DataBaseHelper(this);
try {
myDbHelper.createDataBase();
// contentLog.append("Database Created\n");
}
catch (IOException ioe) {
throw new Error("Unable to create database");
}
try {
myDbHelper.openDataBase();
}
catch (SQLException sqle) {
sqle.printStackTrace();
}
ArrayList<myitems> arraylist = new ArrayList<myitems>();
db = myDbHelper.getReadableDatabase();
mCursor= db.rawQuery("SELECT field_translation_id_value,title,translate,my_id,favorites FROM khotbe"
+ " WHERE translate ="+translate+" ORDER BY field_translation_id_value ASC ;",null);
int i = 1;
mCursor.moveToFirst();
while (mCursor.isAfterLast() == false) {
// contentLog.append("(" + i++ + ")\t\t" + mCursor.getString(1) + "\n");
iran.add(mCursor.getString(1));
arr_intityid.add(mCursor.getString(0));
primarykeyarrlist.add(mCursor.getString(3));
favor.add(mCursor.getInt(4));
arrshomare.add(""+i++);
mCursor.moveToNext();
}
fa= new String [iran.size()];
fa=iran.toArray(fa);
mysid= new String [arr_intityid.size()];
mysid=arr_intityid.toArray(mysid);
primarykeyarr= new String [primarykeyarrlist.size()];
primarykeyarr=primarykeyarrlist.toArray(primarykeyarr);
myshomare=new String[arrshomare.size()];
myshomare=arrshomare.toArray(myshomare);
favorit =new int[favor.size()];
for (int t= 0; t < favor.size(); t++) {
favorit[t]=favor.get(t).intValue();
}
mCursor.moveToPosition(0);
for (int j = 0; j < fa.length; j++) {
myitems qqq= new myitems(fa[j],mysid[j],myshomare[j],primarykeyarr[j],favorit[j]);
arraylist.add(qqq);
}
adapter=new ListViewAdapter(this, arraylist);
mylist.setAdapter(adapter);
Button btn=(Button)findViewById(R.id.btnfavor);
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(towkhotbe.this, "11111111", Toast.LENGTH_SHORT).show();
}
});
}
公共类towkhotbe扩展了ActionBarActivity{
数据库助手myDbHelper;
列表视图mylist;
ArrayList iran、arr_intityid、arrshomare、primarykeyarrlist;
字符串[]fa,mysid,myshomare,primarykeyarr;
sqlitedb数据库;
光标mCursor;
int翻译;
编辑文本我的研究;
int[]喜欢它;
偏袒;
ListViewAdapter适配器;
私人抽屉布局mDrawerLayout;
私有列表视图mDrawerList;
@抑制警告(“弃用”)
私有操作bardrawertoggle mDrawerToggle;
私有字符序列mDrawerTitle;
私有字符序列mTitle;
android.support.v7.app.ActionBar ActionBar;
私人ArrayList NavWrites;
私人导航适配器;
@SuppressLint(“新API”)
@凌驾
创建时受保护的void(Bundle savedInstanceState){
//TODO自动生成的方法存根
super.onCreate(savedInstanceState);
setContentView(R.layout.tow_khotbe);
Intent myintent=getIntent();
translate=myintent.getExtras().getInt(“translate”);
mylist=(ListView)findViewById(R.id.mylist);
mysearch=(EditText)findViewById(R.id.edtxtsearch);
伊朗=新ArrayList();
arr_inityId=新的ArrayList();
arrshomare=newarraylist();
primarykeyarrlist=新ArrayList();
偏好=新的ArrayList();
}
@凌驾
受保护的void onResume(){
//TODO自动生成的方法存根
super.onResume();
myDbHelper=newDatabaseHelper(this.getApplicationContext());
myDbHelper=新的DataBaseHelper(此);
试一试{
myDbHelper.createDataBase();
//append(“创建的数据库”);
}
捕获(ioe异常ioe){
抛出新错误(“无法创建数据库”);
}
试一试{
myDbHelper.openDataBase();
}
捕获(SQLException sqle){
printStackTrace();
}
ArrayList ArrayList=新的ArrayList();
db=myDbHelper.getReadableDatabase();
mCursor=db.rawQuery(“选择字段\翻译\ id \值、标题、翻译、我的id、霍特比的收藏夹”
+“其中translate=“+translate+”按字段顺序\u translate\u id\u value ASC;”,null);
int i=1;
mCursor.moveToFirst();
while(mCursor.isAfterLast()==false){
//contentLog.append(“(“+i++”)\t\t“+mCursor.getString(1)+“\n”);
添加(mCursor.getString(1));
arr_inityId.add(mCursor.getString(0));
添加(mCursor.getString(3));
add(mCursor.getInt(4));
arrshomare.add(“+i++”);
mCursor.moveToNext();
}
fa=新字符串[iran.size()];
fa=伊朗toArray(fa);
mysid=新字符串[arr_inityId.size()];
mysid=arr_inityid.toArray(mysid);
primarykeyarr=新字符串[primarykeyarrlist.size()];
primarykeyarr=primarykeyarrlist.toArray(primarykeyarr);
myshomare=新字符串[arrshomare.size()];
myshomare=arrshomare.toArray(myshomare);
favorit=newint[fovorit.size()];
for(int t=0;t
在您喜爱的按钮的onClick()中使用适配器。notifyDataSetChanged();
示例
Button favoriteButton = (Button) findViewById(R.id.bFavButton);
favoriteButton.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View view){
//Add or remove items to list
..............
//Hey, adapter! Data set updated!
adapter.notifyDataSetChanged();
}
});
使用notifyDatasetChangedmethod@Nilesh可以进一步解释@Shifar Shifz如何将MainActivity中的适配器获取到ListViewAdapter?您可以在Activity
中的方法外部声明ListViewAdapter
,并且可以从类中的任何位置调用。当我在MainActivity中使用onclick时,您必须阅读此@Shifar Shifzpp未运行,但onclick in ListViewAdapter正常。为什么?我认为您的按钮的onclick()
。发布完整的活动。@Shifar Shifz我必须更改主活动,请重新查看
Button favoriteButton = (Button) findViewById(R.id.bFavButton);
favoriteButton.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View view){
//Add or remove items to list
..............
//Hey, adapter! Data set updated!
adapter.notifyDataSetChanged();
}
});