<?xml version="1.0" encoding="utf-8"?> <resources> <declare-styleable name="IconListPreference"> <attr name="entryIcons" format="reference" /> </declare-styleable> </resources>
public IconListPreference(Context context, AttributeSet attrs) {
super(context, attrs);
mContext = context;
// 获取自定义的属性(attrs.xml中)对应行的TypedArray
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.IconListPreference);
// 获取entryIcons属性对应的值
int iconResId = a.getResourceId(R.styleable.IconListPreference_entryIcons, -1);
if (iconResId != -1) {
setEntryIcons(iconResId);
}
// 获取Preferece对应的key
mKey = getKey();
// 获取SharedPreferences
mPref = PreferenceManager.getDefaultSharedPreferences(context);
// 获取SharedPreferences.Editor
mEditor = mPref.edit();
// 获取Entry
// 注意:如果配置文件中没有android:entries属性,则getEntries()为空;
mEntries = getEntries();
// 获取Entry对应的值
// 注意:如果配置文件中没有android:entryValues属性,则getEntries()为空
mEntryValues = getEntryValues();
// 获取该ListPreference保存的值
String value = mPref.getString(mKey, "");
mPosition = findIndexOfValue(value);
// 设置Summary
if (mPosition!=-1) {
setSummary(mEntries[mPosition]);
setIcon(mEntryIcons[mPosition]);
}
a.recycle();
}
/**
* 设置图标:icons数组
*/
private void setEntryIcons(int[] entryIcons) {
mEntryIcons = entryIcons;
}
/**
* 设置图标:根据icon的id数组
*/
public void setEntryIcons(int entryIconsResId) {
TypedArray icons = getContext().getResources().obtainTypedArray(entryIconsResId);
int[] ids = new int[icons.length()];
for (int i = 0; i < icons.length(); i++)
ids[i] = icons.getResourceId(i, -1);
setEntryIcons(ids);
icons.recycle();
}
@Override
protected void onPrepareDialogBuilder(Builder builder) {
super.onPrepareDialogBuilder(builder);
IconAdapter adapter = new IconAdapter(mContext);
builder.setAdapter(adapter, null);
}
public class IconAdapter extends BaseAdapter{
private LayoutInflater mInflater;
public IconAdapter(Context context){
this.mInflater = LayoutInflater.from(context);
}
@Override
public int getCount() {
return mEntryIcons.length;
}
@Override
public Object getItem(int arg0) {
return null;
}
@Override
public long getItemId(int arg0) {
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
if (convertView == null) {
holder = new ViewHolder();
convertView = mInflater.inflate(R.layout.icon_adapter, parent, false);
holder.layout = (LinearLayout)convertView.findViewById(R.id.icon_layout);
holder.img = (ImageView)convertView.findViewById(R.id.icon_img);
holder.info = (TextView)convertView.findViewById(R.id.icon_info);
holder.check = (RadioButton)convertView.findViewById(R.id.icon_check);
convertView.setTag(holder);
}else {
holder = (ViewHolder)convertView.getTag();
}
holder.img.setBackgroundResource(mEntryIcons[position]);
holder.info.setText(mEntries[position]);
holder.check.setChecked(mPosition == position);
final ViewHolder fholder = holder;
final int fpos = position;
convertView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
v.requestFocus();
// 选中效果
fholder.layout.setBackgroundColor(Color.CYAN);
// 更新mPosition
mPosition = fpos;
// 更新Summary
IconListPreference.this.setSummary(mEntries[fpos]);
IconListPreference.this.setIcon(mEntryIcons[fpos]);
// 更新该ListPreference保存的值
mEditor.putString(mKey, mEntryValues[fpos].toString());
mEditor.commit();
// 取消ListPreference设置对话框
getDialog().dismiss();
}
});
return convertView;
}
// ListPreference每一项对应的Layout文件的结构体
private final class ViewHolder {
ImageView img;
TextView info;
RadioButton check;
LinearLayout layout;
}
}
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/icon_layout" android:orientation="horizontal" android:paddingLeft="6dp" android:layout_width="fill_parent" android:layout_height="fill_parent"> <ImageView android:id="@+id/icon_img" android:layout_width="wrap_content" android:layout_height="wrap_content" android:gravity="center_vertical" android:layout_margin="4dp"/> <TextView android:id="@+id/icon_info" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:paddingLeft="6dp" android:layout_gravity="left|center_vertical" android:textAppearance="?android:attr/textAppearanceLarge" /> <RadioButton android:id="@+id/icon_check" android:layout_width="wrap_content" android:layout_height="wrap_content" android:checked="false" android:layout_gravity="right|center_vertical" android:layout_marginRight="6dp"/> </LinearLayout>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android" xmlns:iconlistpreference="http://schemas.android.com/apk/res/com.skw.fragmenttest"> <!-- 系统默认的ListPreference --> <PreferenceCategory android:title="PreferenceCategory A"> <!-- (01) android:key是Preferece的id (02) android:title是Preferece的大标题 (03) android:summary是Preferece的小标题 (04) android:dialogTitle是对话框的标题 (05) android:defaultValue是默认值 (06) android:entries是列表中各项的说明 (07) android:entryValues是列表中各项的值 --> <ListPreference android:key="list_preference" android:dialogTitle="Choose font" android:entries="@array/pref_font_types" android:entryValues="@array/pref_font_types_values" android:summary="sans" android:title="Font" android:defaultValue="sans"/> </PreferenceCategory> <!-- 自定义的ListPreference --> <PreferenceCategory android:title="PreferenceCategory B"> <!-- iconlistpreference:entryIcons是自定义的属性 --> <com.skw.fragmenttest.IconListPreference android:key="icon_list_preference" android:dialogTitle="ChooseIcon" android:entries="@array/android_versions" android:entryValues="@array/android_version_values" iconlistpreference:entryIcons="@array/android_version_icons" android:icon="@drawable/cupcake" android:summary="summary_icon_list_preference" android:title="title_icon_list_preference" /> </PreferenceCategory> </PreferenceScreen>
public class PrefsFragment extends PreferenceFragment {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.preferences);
}
...
}
public class FragmentTest extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// 获取FragmentManager
FragmentManager fragmentManager = getFragmentManager();
// 获取FragmentTransaction
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
PrefsFragment fragment = new PrefsFragment();
// 将fragment添加到容器frag_example中
fragmentTransaction.add(R.id.prefs, fragment);
fragmentTransaction.commit();
}
}
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <FrameLayout android:id="@+id/prefs" android:layout_width="match_parent" android:layout_height="match_parent"/> </LinearLayout>
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