如何获得在GridView复选框状态 [英] How to get checkbox state in a gridview
本文介绍了如何获得在GridView复选框状态的处理方法，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
上的一个按钮点击时，我需要从一个网格视图得到复选框状态
i need to get the check-box state from a grid-view when clicking on a button
我试了很多事情，但状态始终是假的
i tried many things but the state is always "false"
这是我的code
这是适配器
public class CustomSuggestFriends extends ArrayAdapter<Items_FriendsRequest> {
Context context;
dbManage objDB;
Items_FriendsRequest Items_SuggestFriends;
List<Items_FriendsRequest>items;
int Position;
SharedPreferences SharedP;
String user_id="1002", secret_id = "2143054018";
String u_id="1025", ut_ = "1";
public CustomSuggestFriends(Context context, int textViewResourceId,
List<Items_FriendsRequest> objects) {
super(context, textViewResourceId, objects);
this.context = context;
}
private class viewHolder {
private ImageView userImage;
private TextView userName;
private CheckBox checkbox;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
viewHolder holder = null;
ImageLoader_Crop imageLoader_Crop;
Items_SuggestFriends = getItem(position);
Position = position;
objDB = new dbManage(getContext());
items = objDB.select_SuggestFriends();
objDB.CloseDataBase();
LayoutInflater inflater = (LayoutInflater) context
.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
imageLoader_Crop = new ImageLoader_Crop(context.getApplicationContext());
if (convertView == null) {
convertView = inflater.inflate(R.layout.items_suggestdriends, null);
holder = new viewHolder();
holder.userImage = (ImageView) convertView
.findViewById(R.id.Items_SuggestFriends_userImage);
holder.userName = (TextView) convertView
.findViewById(R.id.Items_SuggestFriends_NameTXT);
holder.checkbox = (CheckBox) convertView
.findViewById(R.id.Items_SuggestFriends_checkBox);
holder.checkbox.setTag(position);
holder.checkbox.setChecked(items.get(position).isSelected());
holder.checkbox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
int getPosition = (Integer) buttonView.getTag(); // Here we get the position that we have set for the checkbox using setTag.
items.get(getPosition).setSelected(buttonView.isChecked()); // Set the value of checkbox to maintain its state.
Log.v("Changed",items.get(getPosition).getId_()+"");
}
});
convertView.setTag(holder);
} else {
holder = (viewHolder) convertView.getTag();
}
holder.userName.setText(Items_SuggestFriends.getName_());
String SuggestF = Items_SuggestFriends.getSuggestFriendsSEND();
if (SuggestF.equals("0")) {
holder.checkbox.setVisibility(View.VISIBLE);
} else if (SuggestF.equals("1")) {
holder.checkbox.setVisibility(View.GONE);
}
String imageURL = "";
imageURL = functionspackage.Constants.server_file + "1/s/"
+ Items_SuggestFriends.getId_() + "."
+ Items_SuggestFriends.getRand_() + ".jpg";
holder.userImage.setTag(imageURL);
imageLoader_Crop.DisplayImage(imageURL, context, holder.userImage);
return convertView;
}
}
这是我班的有一个按钮叫发送
在此按钮，我需要得到的是什么cheked的ID
this is my class its got a button called send and in this button i need to get the ids of what is cheked
public class SuggestFriends extends Activity {
int count;
dbManage objDB;
SharedPreferences SharedP;
String user_id, secret_id = "";
public static String u_id, ut_ = "";
Button send, cancel;
List<Items_FriendsRequest> SuggestFriendsItems;
GridView gridView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.displayphoto_from_album);
initialise_View();
在这里，我需要得到的值，但它总是假的！！！！
here i need to get the values but its always false!!!!
send.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
count = gridView.getCount();
objDB = new dbManage(SuggestFriends.this);
SuggestFriendsItems = objDB.select_SuggestFriends();
objDB.CloseDataBase();
SparseBooleanArray sparseBooleanArray = gridView
.getCheckedItemPositions();
// add the id of the ones that been checked . . to string with
// (,)
for (int i = 0; i < count; i++) {
if(sparseBooleanArray.valueAt(i) == true) {
Log.e(sparseBooleanArray.get(i)+"",SuggestFriendsItems.get(i).getId_()+"");
} else if (!sparseBooleanArray.get(i)) {
Log.e(sparseBooleanArray.get(i) +"",SuggestFriendsItems.get(i).getId_()+"");
gridView.getItemAtPosition(i);
}
}
}
});
SharedP = getSharedPreferences(functionspackage.Constants.SharedP_name,
0);
user_id = SharedP.getString(functionspackage.Constants.SharedP_user_id,
null);
secret_id = SharedP.getString(
functionspackage.Constants.SharedP_secret_id, null);
if (getIntent().hasExtra(functionspackage.Constants.Extra_Uid)) {
u_id = getIntent().getStringExtra(
functionspackage.Constants.Extra_Uid);
}
if (getIntent().hasExtra(functionspackage.Constants.Extra_ut)) {
ut_ = getIntent().getStringExtra(
functionspackage.Constants.Extra_ut);
}
SuggestFriends_AsyncTask Async = new SuggestFriends_AsyncTask();
Async.execute(user_id, secret_id, u_id, ut_);
}
// ///////////////////////////////////////////////////////////////
// ///////////////////////////////////////////////////////////////
// ///////////////////////////////////////////////////////////////
String response = "";
class SuggestFriends_AsyncTask extends AsyncTask<String, Integer, String> {
@Override
protected String doInBackground(String... params) {
response = "";
response = functionspackage.methodes.HTTP_fileInf_OPhotos(
functionspackage.Constants.server_Web_Profiles
+ "/suggest/" + params[3] + "/" + params[2],
params[0], params[1], 0);
functionspackage.methodes.install_JSON_SuggestFriends(
SuggestFriends.this, response);
objDB = new dbManage(SuggestFriends.this);
SuggestFriendsItems = objDB.select_SuggestFriends();
objDB.CloseDataBase();
return null;
}
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
CustomSuggestFriends adapterSuggestFriends = new CustomSuggestFriends(
SuggestFriends.this, R.layout.items_suggestdriends,
SuggestFriendsItems);
gridView.setAdapter(adapterSuggestFriends);
gridView.setChoiceMode(GridView.CHOICE_MODE_MULTIPLE);
}
}
// ///////////////////////////////////////////////////////////////
// ///////////////////////////////////////////////////////////////
// ///////////////////////////////////////////////////////////////
private void initialise_View() {
gridView = (GridView) findViewById(R.id.DisplayPhoto_gridView);
gridView.setNumColumns(3);
gridView.setBackgroundColor(Color.BLACK);
send = (Button) findViewById(R.id.SendSuggestBotton);
cancel = (Button) findViewById(R.id.CancelsuggestFrindes);
}
}
这是对数
推荐答案
使用稀疏布尔数组
在这里查看这个链接
的https://groups.google.com/forum/?fromgroups#!topic/android-developers/No0LrgJ6q2M
检查罗曼盖伊解决方案。使用GridView控件，而不是列表视图。
Check Romain Guy Solution. Use GridView instead of Listview.
类似的人回答在这里。取而代之的列表视图使用GridView控件。
Similar to the one answered here. Instead of listview use gridview.
<一个href=\"http://stackoverflow.com/questions/17234399/in-gridview-checkbox-is-unchecked-while-scrolling-gridview-up-and-down\">in GridView的复选框被选中，而GridView的滚动上下
下面有'的另一个例子。同样使用的GridView，而不是列表视图
Heres' another example. Same use gridview instead of Listview
<一个href=\"http://stackoverflow.com/questions/17168814/how-to-change-the-text-of-a-checkbox-in-listview\">How以更改CheckBox的文字列表视图？
下面是完整的例子
public class MainActivity extends Activity implements
AdapterView.OnItemClickListener {
int count;
private CheckBoxAdapter mCheckBoxAdapter;
String[] GENRES = new String[] {
"Action", "Adventure", "Animation", "Children", "Comedy",
"Documentary", "Drama",
"Foreign", "History", "Independent", "Romance", "Sci-Fi",
"Television", "Thriller"
};
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final GridView listView = (GridView) findViewById(R.id.lv);
// listView.setItemsCanFocus(false);
listView.setTextFilterEnabled(true);
listView.setOnItemClickListener(this);
mCheckBoxAdapter = new CheckBoxAdapter(this, GENRES);
listView.setAdapter(mCheckBoxAdapter);
Button b= (Button) findViewById(R.id.button1);
b.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
StringBuilder result = new StringBuilder();
result.append("Checked at position");
result.append("\n");
for(int i=0;i<mCheckBoxAdapter.mCheckStates.size();i++)
{
if(mCheckBoxAdapter.mCheckStates.get(i)==true)
{
result.append(mCheckBoxAdapter.mCheckStates.get(i)+" at"+i);
result.append("\n");
}
}
Toast.makeText(MainActivity.this, result, 10000).show();
}
});
}
public void onItemClick(AdapterView parent, View view, int
position, long id) {
mCheckBoxAdapter.toggle(position);
}
class CheckBoxAdapter extends ArrayAdapter implements CompoundButton.OnCheckedChangeListener
{ private SparseBooleanArray mCheckStates;
LayoutInflater mInflater;
TextView tv1,tv;
CheckBox cb;
String[] gen;
CheckBoxAdapter(MainActivity context, String[] genres)
{
super(context,0,genres);
mCheckStates = new SparseBooleanArray(genres.length);
mInflater = (LayoutInflater)MainActivity.this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
gen= genres;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return gen.length;
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
View vi=convertView;
if(convertView==null)
vi = mInflater.inflate(R.layout.checkbox, null);
tv= (TextView) vi.findViewById(R.id.textView1);
cb = (CheckBox) vi.findViewById(R.id.checkBox1);
tv.setText("Name :"+ gen [position]);
cb.setTag(position);
cb.setChecked(mCheckStates.get(position, false));
cb.setOnCheckedChangeListener(this);
return vi;
}
public boolean isChecked(int position) {
return mCheckStates.get(position, false);
}
public void setChecked(int position, boolean isChecked) {
mCheckStates.put(position, isChecked);
}
public void toggle(int position) {
setChecked(position, !isChecked(position));
}
@Override
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
mCheckStates.put((Integer) buttonView.getTag(), isChecked);
}
}
}
activit_main.xml
activit_main.xml
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<GridView
android:id="@+id/lv"
android:layout_width="wrap_content"
android:numColumns="2"
android:layout_height="wrap_content"
android:layout_above="@+id/button1"/>
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:text="Button" />
</RelativeLayout>
checkbox.xml
checkbox.xml
<?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="match_parent" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="15dp"
android:layout_marginTop="34dp"
android:text="TextView" />
<CheckBox
android:id="@+id/checkBox1"
android:focusable="false"
android:focusableInTouchMode="false"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_below="@+id/textView1"
android:layout_marginRight="22dp"
android:layout_marginTop="23dp" />
</RelativeLayout>
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