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    <p>1): In <code>prefsEditr.putFloat("strength", -1);</code> the value "-1" is an Integer and therefore stored as an Integer. You could use <code>Float.parseFloat</code> to parse an Integer (eg parsing the stored Integer value or parsing an Integer value and store it).</p> <p>Can you please elaborate 2) and 3)? I did not get what <em>exactly</em> you meant.</p> <p>/edit: Some sample code for saving / reading an array</p> <pre><code>public String[] readArray() { SharedPreferences openPreferences = context.getSharedPreferences("arrayfile", Context.MODE_PRIVATE); final Integer counter = openPreferences.getInt("size", 0); String[] result = new String[counter]; for (int i=0;i&lt;counter;i++) { result[i] = openPreferences.getString("entry_"+i, ""); } return result; } public void writeArray(String[] array) { Editor editor = context.getSharedPreferences("arrayfile", Context.MODE_PRIVATE).edit(); final Integer counter =array.length; editor.putInt("size", counter); for (int i=0;i&lt;counter;i++) { editor.putString("entry_"+i, array[i]); } editor.commit(); } </code></pre> <p>/edit: Also use a <code>PreferenceActivity</code> instead of a <code>ListActivity</code>. That makes things easier.</p> <p>Then add this code in <code>OnCreate()</code>:</p> <pre><code> PreferenceManager localPreferenceManager = getPreferenceManager(); localPreferenceManager.setSharedPreferencesName("main_prefs"); localPreferenceManager.setSharedPreferencesMode(MODE_PRIVATE); [for every entry do:] { addNewPref("ArrayValue"); } </code></pre> <p>and then add dynamically Preference Views to the Activity, just adjust the code below:</p> <pre><code> private void addNewPref(String title) { Preference newPref = new Preference(this); newPref.setTitle(title); ((PreferenceScreen) getPreferenceManager().findPreference("category_key")).addItemFromInflater(newPref); } </code></pre> <p>Content of the <code>PreferenceScreen</code> XML:</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;PreferenceScreen android:key="category_key" xmlns:android="http://schemas.android.com/apk/res/android" &gt; &lt;/PreferenceScreen&gt; </code></pre>
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    1. POusing preferences -- my listview is empty (can't store data)
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    1. CO:Hello,1) i did "putFloat("strength", -1.0f)" but still the same..As for (2) i am asking this.the user enters some input.How can i use that input?(for example he inputs "serial_number".How i will use this value in my application?That's why i am trying to do "String serial_number = mypref.getString("serial_number", "");" but i am not sure..As for (3) in the code above (the last one) ,i want to put in the 'String values' all the values(serial_number) from user input,in order to show them in a list.Finally,check comments inside "protected void onListItemClick.." at the same code(last).Thank
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    2. COTo read out / write values from / to SharedPreferences, create a new SharedPreferences object, here's a tutorial: http://android-er.blogspot.com/2011/01/example-of-using-sharedpreferencesedito.html This should answer 2) and 3) :)
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    3. COAlso have a look at the developers page: http://developer.android.com/reference/android/content/SharedPreferences.html
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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