1 package com.android.settings; 2 3 import android.content.Context; 4 import android.support.v7.preference.PreferenceViewHolder; 5 import android.util.AttributeSet; 6 import android.util.Log; 7 import android.widget.Checkable; 8 9 /** 10 * A hybrid of AppListPreference and SwitchPreference, representing a preference which can be on or 11 * off but must have a selected value when turned on. 12 * 13 * It is invalid to show this preference when zero valid apps are present. 14 */ 15 public class AppListSwitchPreference extends AppListPreference { 16 private static final String TAG = "AppListSwitchPref"; 17 18 private Checkable mSwitch; 19 20 public AppListSwitchPreference(Context context, AttributeSet attrs) { 21 super(context, attrs, 0, R.style.AppListSwitchPreference); 22 } 23 24 @Override 25 public void onBindViewHolder(PreferenceViewHolder view) { 26 super.onBindViewHolder(view); 27 mSwitch = (Checkable) view.findViewById(com.android.internal.R.id.switch_widget); 28 mSwitch.setChecked(getValue() != null); 29 } 30 31 @Override 32 protected void onClick() { 33 if (getValue() != null) { 34 // Turning off the current value. 35 if (callChangeListener(null)) { 36 setValue(null); 37 } 38 } else if (getEntryValues() == null || getEntryValues().length == 0) { 39 Log.e(TAG, "Attempting to show dialog with zero entries: " + getKey()); 40 } else if (getEntryValues().length == 1) { 41 // Suppress the dialog and just toggle the preference with the only choice. 42 String value = getEntryValues()[0].toString(); 43 if (callChangeListener(value)) { 44 setValue(value); 45 } 46 } else { 47 super.onClick(); 48 } 49 } 50 51 @Override 52 public void setValue(String value) { 53 super.setValue(value); 54 if (mSwitch != null) { 55 mSwitch.setChecked(value != null); 56 } 57 } 58 } 59
