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MultiSelectListPreference.java
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MultiSelectListPreference.java
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/**
* Mupen64PlusAE, an N64 emulator for the Android platform
*
* Copyright (C) 2013 Paul Lamb
*
* This file is part of Mupen64PlusAE.
*
* Mupen64PlusAE is free software: you can redistribute it and/or modify it under the terms of the
* GNU General Public License as published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* Mupen64PlusAE is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with Mupen64PlusAE. If
* not, see <http://www.gnu.org/licenses/>.
*
* Authors: littleguy77
*/
package paulscode.android.mupen64plusae.preference;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import org.mupen64plusae.v3.alpha.dmult.R;
import android.app.AlertDialog.Builder;
import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnMultiChoiceClickListener;
import android.content.res.TypedArray;
import android.preference.ListPreference;
import android.text.TextUtils;
import android.util.AttributeSet;
/**
* Multi-select list preference. Honeycomb and above provide this functionality natively, but we
* need backwards-compatibility and some custom features. This gets the job done without much fuss.
*/
public class MultiSelectListPreference extends ListPreference implements OnMultiChoiceClickListener
{
/** The default delimiter for internal serialization/deserialization. */
private static final String DEFAULT_DELIMITER = "~";
/** The default delimiter for external display of the selected values. */
private static final String DEFAULT_SEPARATOR = ", ";
/** The delimiter for internal serialization/deserialization. */
private final String mDelimiter;
/** The delimiter for external display of the selected values. */
private final String mSeparator;
/** The state of each checkbox in the list. */
private boolean[] mCheckedStates;
/**
* Instantiates a new multi-select list preference.
*
* @param context The current context.
* @param attrs The attributes provided from the xml resource.
*/
public MultiSelectListPreference( Context context, AttributeSet attrs )
{
super( context, attrs );
TypedArray a = context
.obtainStyledAttributes( attrs, R.styleable.MultiSelectListPreference );
String delimiter = a.getString( R.styleable.MultiSelectListPreference_delimiter );
String separator = a.getString( R.styleable.MultiSelectListPreference_separator );
a.recycle();
mDelimiter = TextUtils.isEmpty( delimiter ) ? DEFAULT_DELIMITER : delimiter;
mSeparator = TextUtils.isEmpty( separator ) ? DEFAULT_SEPARATOR : separator;
}
/**
* Gets the selected values.
*
* @return The selected values.
*/
public List<String> getSelectedValues()
{
List<String> selectedValues = new ArrayList<String>();
CharSequence[] allValues = getEntryValues();
for( int i = 0; i < allValues.length; i++ )
{
if( mCheckedStates[i] )
selectedValues.add( allValues[i].toString() );
}
return selectedValues;
}
/**
* Gets the selected entries.
*
* @return The selected entries.
*/
public List<CharSequence> getSelectedEntries()
{
List<CharSequence> selectedEntries = new ArrayList<CharSequence>();
CharSequence[] allEntries = getEntries();
for( int i = 0; i < allEntries.length; i++ )
{
if( mCheckedStates[i] )
selectedEntries.add( allEntries[i] );
}
return selectedEntries;
}
/**
* Gets the selected entries as a concatenated string.
*
* @return The selected entries as a string.
*/
public CharSequence getSelectedEntriesString()
{
return TextUtils.join( mSeparator, getSelectedEntries() );
}
/*
* (non-Javadoc)
*
* @see android.preference.ListPreference#setEntries(java.lang.CharSequence[])
*/
@Override
public void setEntries( CharSequence[] entries )
{
super.setEntries( entries );
synchronizeState( getValue() );
}
/*
* (non-Javadoc)
*
* @see android.preference.ListPreference#setValue(java.lang.String)
*/
@Override
public void setValue( String value )
{
super.setValue( value );
synchronizeState( getValue() );
}
/*
* (non-Javadoc)
*
* @see
* android.preference.ListPreference#onPrepareDialogBuilder(android.app.AlertDialog.Builder)
*/
@Override
protected void onPrepareDialogBuilder( Builder builder )
{
synchronizeState( getValue() );
builder.setMultiChoiceItems( getEntries(), mCheckedStates, this );
}
/*
* (non-Javadoc)
*
* @see android.content.DialogInterface.OnMultiChoiceClickListener#onClick(android.content.
* DialogInterface, int, boolean)
*/
@Override
public void onClick( DialogInterface dialog, int which, boolean isChecked )
{
mCheckedStates[which] = isChecked;
}
/*
* (non-Javadoc)
*
* @see android.preference.ListPreference#onDialogClosed(boolean)
*/
@Override
protected void onDialogClosed( boolean positiveResult )
{
// super.onDialogClosed(positiveResult);
String newValue = serialize( getSelectedValues(), mDelimiter );
if( positiveResult && callChangeListener( newValue ) )
{
// Persist the new value
setValue( newValue );
}
}
/**
* Synchronize internal state and summary with the selected and available values.
*/
private void synchronizeState( String value )
{
List<String> selectedValues = deserialize( value, mDelimiter );
CharSequence[] allValues = getEntryValues();
mCheckedStates = new boolean[allValues.length];
for( int i = 0; i < allValues.length; i++ )
{
mCheckedStates[i] = selectedValues.contains( allValues[i].toString() );
}
setSummary( getSelectedEntriesString() );
}
/**
* Deserialize the selected values array from a string.
*
* @param value The serialized value of the array.
* @param delimiter The delimiter used between array elements in the serialization.
*
* @return The array of selected values.
*/
public static List<String> deserialize( String value, String delimiter )
{
return Arrays.asList( value.split( delimiter ) );
}
/**
* Deserialize the selected values array from a string using the default delimiter.
*
* @param value The serialized value of the array.
*
* @return The array of selected values.
*/
public static List<String> deserialize( String value )
{
return deserialize( value, DEFAULT_DELIMITER );
}
/**
* Serialize the selected values array to a string.
*
* @param selectedValues The array of selected values.
* @param delimiter The delimiter used between array elements in the serialization.
*
* @return The serialized value of the array.
*/
public static String serialize( List<String> selectedValues, String delimiter )
{
return selectedValues == null ? "" : TextUtils.join( delimiter, selectedValues );
}
/**
* Serialize the selected values array to a string using the default delimiter.
*
* @param selectedValues The array of selected values.
*
* @return The serialized value of the array.
*/
public static String serialize( List<String> selectedValues )
{
return serialize( selectedValues, DEFAULT_DELIMITER );
}
}