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POAndroid: CheckBox tree
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  1. POAndroid: CheckBox tree
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    copied!<p>In my application, I have a list and a button, in my list i want when i select parent item all of the child-item be selected indeed I want a Check-box tree. I use an Expandable List View but i have a problem in my code:</p> <p>My code is: list_group.xml:</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="wrap_content" android:orientation="vertical" android:padding="8dp" android:background="#000000"&gt; &lt;CheckBox android:id="@+id/checkbox" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="" android:layout_marginLeft="30dp" android:layout_marginRight="2dp" android:focusable="false"/&gt; &lt;TextView android:id="@+id/lblListHeader" android:layout_width="fill_parent" android:layout_height="wrap_content" android:paddingLeft="?android:attr/expandableListPreferredItemPaddingLeft" android:textSize="17dp" android:textColor="#ffffff" /&gt; &lt;/LinearLayout&gt; </code></pre> <p>list_item2.xml:</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="55dip" android:orientation="horizontal" android:background="#ffffff"&gt; &lt;CheckBox android:id="@+id/checkbox" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="" android:layout_marginLeft="30dp" android:layout_marginRight="2dp" android:focusable="false"/&gt; &lt;TextView android:id="@+id/lblListItem" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textSize="17dip" android:paddingTop="5dp" android:paddingBottom="5dp" android:layout_marginLeft="-40dp" android:paddingLeft="?android:attr/expandableListPreferredChildPaddingLeft"/&gt; &lt;/LinearLayout&gt; </code></pre> <p>backup_list.xml:</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent" android:background="#000000"&gt; &lt;ExpandableListView android:layout_weight="1" android:layout_width="match_parent" android:layout_height="0dp" android:id="@+id/expandableListView"/&gt; &lt;Button android:id="@+id/backup" android:layout_gravity="center_horizontal" android:layout_width="150dp" android:layout_height="wrap_content" android:text="BackUp" android:clickable="true" /&gt; &lt;/LinearLayout&gt; </code></pre> <p>How can i fix it?</p> <p>ExpandableListAdapter:</p> <pre><code>package com.mCloud.android.ui.activity; import java.util.HashMap; import java.util.List; import android.content.Context; import android.graphics.Typeface; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.BaseExpandableListAdapter; import android.widget.TextView; import com.mCloud.android.R; public class ExpandableListAdapter extends BaseExpandableListAdapter { private Context _context; private List&lt;String&gt; _listDataHeader; // header titles // child data in format of header title, child title private HashMap&lt;String, List&lt;String&gt;&gt; _listDataChild; public ExpandableListAdapter(Context context, List&lt;String&gt; listDataHeader, HashMap&lt;String, List&lt;String&gt;&gt; listChildData) { this._context = context; this._listDataHeader = listDataHeader; this._listDataChild = listChildData; } @Override public Object getChild(int groupPosition, int childPosititon) { return this._listDataChild.get(this._listDataHeader.get(groupPosition)) .get(childPosititon); } @Override public long getChildId(int groupPosition, int childPosition) { return childPosition; } @Override public View getChildView(int groupPosition, final int childPosition, boolean isLastChild, View convertView, ViewGroup parent) { final String childText = (String) getChild(groupPosition, childPosition); if (convertView == null) { LayoutInflater infalInflater = (LayoutInflater) this._context .getSystemService(Context.LAYOUT_INFLATER_SERVICE); convertView = infalInflater.inflate(R.layout.list_item2, null); } TextView txtListChild = (TextView) convertView .findViewById(R.id.lblListItem); txtListChild.setText(childText); return convertView; } @Override public int getChildrenCount(int groupPosition) { return this._listDataChild.get(this._listDataHeader.get(groupPosition)) .size(); } @Override public Object getGroup(int groupPosition) { return this._listDataHeader.get(groupPosition); } @Override public int getGroupCount() { return this._listDataHeader.size(); } @Override public long getGroupId(int groupPosition) { return groupPosition; } @Override public View getGroupView(int groupPosition, boolean isExpanded,View convertView, ViewGroup parent){ String headerTitle = (String) getGroup(groupPosition); if (convertView == null) { LayoutInflater infalInflater = (LayoutInflater) this._context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); convertView = infalInflater.inflate(R.layout.list_group, null); } TextView lblListHeader = (TextView) convertView.findViewById(R.id.lblListHeader); lblListHeader.setTypeface(null, Typeface.BOLD); lblListHeader.setText(headerTitle); return convertView; } @Override public boolean hasStableIds() { return false; } @Override public boolean isChildSelectable(int groupPosition, int childPosition){ return true; } } </code></pre> <p>ParentActivity:</p> <pre><code>package com.mCloud.android.ui.activity; import java.io.File; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import android.content.Intent; import android.os.Bundle; import android.os.Environment; import android.widget.ExpandableListView; import com.actionbarsherlock.app.ActionBar; import com.actionbarsherlock.app.SherlockFragmentActivity; import com.actionbarsherlock.view.MenuItem; import com.mCloud.android.Log_OC; import com.mCloud.android.R; import com.mCloud.android.filters.MediaFilenameFilter; public class ParentActivity extends SherlockFragmentActivity { private static final String TAG = "mCloudPreferences"; ExpandableListAdapter listAdapter; ExpandableListView expListView; List&lt;String&gt; listDataHeader; HashMap&lt;String, List&lt;String&gt;&gt; listDataChild; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.backup_list); ActionBar actionBar = getSherlock().getActionBar(); actionBar.setDisplayHomeAsUpEnabled(true); // get the listview expListView = (ExpandableListView) findViewById(R.id.expandableListView); // preparing list data prepareListData(); listAdapter = new ExpandableListAdapter(this, listDataHeader, listDataChild); // setting list adapter expListView.setAdapter(listAdapter); } @Override public boolean onMenuItemSelected(int featureId, MenuItem item) { super.onMenuItemSelected(featureId, item); Intent intent; switch (item.getItemId()) { case android.R.id.home: intent = new Intent(getBaseContext(), DisplayInfoActivity.class); intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); startActivity(intent); break; default: Log_OC.w(TAG, "Unknown menu item triggered"); return false; } return true; } /* * Preparing the list data */ private void prepareListData() { listDataHeader = new ArrayList&lt;String&gt;(); listDataHeader.add("Files"); listDataHeader.add("Apps"); listDataHeader.add("SMS"); listDataHeader.add("Contacts"); listDataHeader.add("Call Logs"); listDataHeader.add("Calender"); listDataHeader.add("Setting"); List&lt;String&gt; files = new ArrayList&lt;String&gt;(); File file = Environment.getExternalStorageDirectory(); String[] list = file.list(new MediaFilenameFilter()); if (list != null) { for (String name : list) files.add(name); } files.add("Advance Selection"); List&lt;String&gt; apps = new ArrayList&lt;String&gt;(); apps.add("All Apps"); List&lt;String&gt; sms = new ArrayList&lt;String&gt;(); sms.add("Inbox"); sms.add("Draft"); sms.add("Send"); List&lt;String&gt; contacts = new ArrayList&lt;String&gt;(); contacts.add("All Contacts"); List&lt;String&gt; calllogs = new ArrayList&lt;String&gt;(); calllogs.add("Resived"); calllogs.add("Missed"); calllogs.add("Dailed"); List&lt;String&gt; calender = new ArrayList&lt;String&gt;(); calender.add("All calender"); List&lt;String&gt; setting = new ArrayList&lt;String&gt;(); setting.add("All setting"); listDataChild = new HashMap&lt;String, List&lt;String&gt;&gt;(); listDataChild.put(listDataHeader.get(0), files); listDataChild.put(listDataHeader.get(1), apps); listDataChild.put(listDataHeader.get(2), sms); listDataChild.put(listDataHeader.get(3), contacts); listDataChild.put(listDataHeader.get(4), calllogs); listDataChild.put(listDataHeader.get(5), calender); listDataChild.put(listDataHeader.get(6), setting); } } </code></pre>
 

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