StackOverflow2013

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17333522
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0
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0
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0
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2013-06-27T02:19:31.317
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0
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2013-06-27T02:19:31.317
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0
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875834
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17326400
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2
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0
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text
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If the amount of data you want to save is relatively small you can use <a href="http://developer.android.com/reference/android/content/SharedPreferences.html" rel="nofollow">SharedPreferences</a> to save the <code>String</code> data in your <code>onClick</code> method. <pre><code>@Override public void onClick(DialogInterface dialog, int which) { String input = etAddCat.getText().toString(); if(null != input && input.length() > 0){ listItems.add(input); // Add all string data to List<String> listItem listItem.add(input); arrayAdapter.notifyDataSetChanged(); }else{ Toast.makeText(getApplicationContext(), "Please enter a new category", Toast.LENGTH_LONG).show(); } } </code></pre> When the user leaves your activity, use the <code>onStop()</code> callback method to save your <code>List<Strings></code> and store it through <code>SharedPreferences</code>. <pre><code>@Override private void onStop() { super.onStop(); SharedPreferences.Editor editor = mSharedPreferences.edit(); editor.putString(getResources().getString(R.string.list_of_strings), new HashSet<String>(listItem)); editor.commit; } </code></pre> Using the <code>onStart()</code> callback, initialize your <code>List</code> and <code>SharedPreferences</code>. When the user navigates to your activity, your list will be reinitialized when it was saved via <code>onStop()</code>. Finally, iterate through your list, add your items to your <code>ArrayList', create your</code>ArrayAdapter` and set it to your list. <pre><code>@Override private onStart(){ super.onStart(); SharedPreferences mSharedPreferences; mSharedPreferences = this.getApplicationContext().getSharedPreferences("MyPreferences", 0); List<String> listItems = new ArrayList<String>(mSharedPreferences.getStringSet("ListOfStrings", null)); ListIterator li = listItem.listIterator(0); while (li.hasNext()) { newStatusList.add((String)li.next()); } arrayAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1, listItems); lv.setAdapter(arrayAdapter); } </code></pre>
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