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POHow to check all checkboxes in a ListView
 

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  1. POHow to check all checkboxes in a ListView
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    <p>I have a list, in which each row contains a checkbox and a textview, also I have a button which should check/uncheck all checkboxes in the list, however, I have not been able to achieve this with the checkboxes OUTSIDE of the screen, only with the visibles one. And if I understood well, that happens because items outside of the screens dont exist, they are recycled to create the new rows while scrolling, causing null pointers/out of index errores while trying to check/access the checkboxes outside of the screen.</p> <p>I Googled for solutions but nothing worked so far.</p> <p>How can I solve this?</p> <p>Here is the adapter:</p> <pre><code>public class AlumnoArrayAdapter&lt;T&gt; extends BaseAdapter{ Context mContext; LayoutInflater mInflater; ArrayList&lt;T&gt; mList; ArrayList&lt;Alumno&gt; alumno; boolean verEstadisticas; SparseBooleanArray mSparseBooleanArray; public AlumnoArrayAdapter(Context context, ArrayList&lt;T&gt; list, ArrayList&lt;Alumno&gt; alumno, boolean verEstadisticas) { //TODO Auto-generated constructor stub this.alumno = alumno; this.verEstadisticas = verEstadisticas; this.mContext = context; mInflater = LayoutInflater.from(mContext); mSparseBooleanArray = new SparseBooleanArray(); mList = new ArrayList&lt;T&gt;(); this.mList = list; } public ArrayList&lt;T&gt; getCheckedItems() { ArrayList&lt;T&gt; mTempArry = new ArrayList&lt;T&gt;(); for(int i=0;i&lt;mList.size();i++) { if(mSparseBooleanArray.get(i)) { mTempArry.add(mList.get(i)); } } return mTempArry; } public int getCount() { return mList.size(); } public Object getItem(int position) { return mList.get(position); } public long getItemId(int position) { return position; } public View getView(final int position, View convertView, ViewGroup parent) { if(convertView == null) { convertView = mInflater.inflate(R.layout.row, null); } TextView tvTitle = (TextView) convertView.findViewById(R.id.tvTitle); tvTitle.setText(mList.get(position).toString()); CheckBox mCheckBox = (CheckBox) convertView.findViewById(R.id.chkEnable); mCheckBox.setTag((Integer) position); mCheckBox.setChecked(mSparseBooleanArray.get(position)); mCheckBox.setOnCheckedChangeListener(mCheckedChangeListener); if(verEstadisticas){ mCheckBox.setVisibility(View.GONE); } mCheckBox.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { CheckBox cb = (CheckBox) v; Integer position = (Integer) cb.getTag(); alumno.get(position).setChecked(cb.isChecked()); } }); return convertView; } OnCheckedChangeListener mCheckedChangeListener = new OnCheckedChangeListener() { public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { mSparseBooleanArray.put((Integer) buttonView.getTag(), isChecked); } }; } </code></pre> <p>If more code is needed please let me know.</p> <p>Would appreciate any help possible.</p> <p>Thanks in advance!</p> <p>EDIT: Got a solution!, the modified adapter:</p> <pre><code>public class AlumnoArrayAdapter&lt;T&gt; extends BaseAdapter{ Context mContext; LayoutInflater mInflater; ArrayList&lt;T&gt; mList; ArrayList&lt;Alumno&gt; alumno; boolean verEstadisticas; SparseBooleanArray mSparseBooleanArray; boolean checarTodo = false; public AlumnoArrayAdapter(Context context, ArrayList&lt;T&gt; list, ArrayList&lt;Alumno&gt; alumno, boolean verEstadisticas) { //TODO Auto-generated constructor stub this.alumno = alumno; this.verEstadisticas = verEstadisticas; this.mContext = context; mInflater = LayoutInflater.from(mContext); mSparseBooleanArray = new SparseBooleanArray(); mList = new ArrayList&lt;T&gt;(); this.mList = list; } public ArrayList&lt;T&gt; getCheckedItems() { ArrayList&lt;T&gt; mTempArry = new ArrayList&lt;T&gt;(); for(int i=0;i&lt;mList.size();i++) { if(mSparseBooleanArray.get(i)) { mTempArry.add(mList.get(i)); } } return mTempArry; } public int getCount() { return mList.size(); } public Object getItem(int position) { return mList.get(position); } public long getItemId(int position) { return position; } public void checkAll(){ for(int x = 0; x &lt; alumno.size(); x++){ alumno.get(x).setChecked(!alumno.get(x).isChecked()); } } public View getView(final int position, View convertView, ViewGroup parent) { if(convertView == null) { convertView = mInflater.inflate(R.layout.row, null); } TextView tvTitle = (TextView) convertView.findViewById(R.id.tvTitle); tvTitle.setText(mList.get(position).toString()); CheckBox mCheckBox = (CheckBox) convertView.findViewById(R.id.chkEnable); mCheckBox.setTag((Integer) position); mCheckBox.setChecked(alumno.get(position).isChecked()); if(verEstadisticas){ mCheckBox.setVisibility(View.GONE); } mCheckBox.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { CheckBox cb = (CheckBox) v; //Alumno Alumno = (Alumno) cb.getTag(); Integer position = (Integer) cb.getTag(); alumno.get(position).setChecked(cb.isChecked()); } }); return convertView; } } </code></pre>
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