android.preference.ListPreference的一些特性
android:key 选项的名称或键
android:title 选项的标题
android:summary 选项的简短摘要
android:entries 可将选项设置成的列表项文本
android:entryValues 定义每个列表项的键或值
android:dialogTitle 对话框的标题
android:defaultValue 项列表中选项的默认值
1、布局:
<PreferenceScreen
xmlns:android="http://schemas.android.com/apk/res/android"
android:key="flight_option_preference"
android:title="@string/prefTile"
android:summary="@string/prefSummary">
<ListPreference
android:key="@string/speed_preference" //选项的名称或键
android:title="@string/listTitle" //选项的标题
android:summary="@string/listSummery" //选项的简短摘要
android:entries="@array/flight_sort_options" //可将选项设置成的列表项文本
android:entryValues="@array/flight_sort_options_values" // 定义每个列表项的键或值
android:dialogTitle="@string/dialogTile" // 对话框的标题
android:defaultValue="@string/flight_sort_option_default_value"/> //项列表中选项的默认值
</PreferenceScreen>
2、加载:
public class TtsSettings extends PreferenceActivity implements OnPreferenceChangeListener {
public static final String PREFER_NAME = "com.iflytek.setting";
private EditTextPreference mSpeedPreference;
private EditTextPreference mPitchPreference;
private EditTextPreference mVolumePreference;
@SuppressWarnings("deprecation")
@Override
public void onCreate(Bundle savedInstanceState) {
requestWindowFeature(Window.FEATURE_NO_TITLE);
super.onCreate(savedInstanceState);
// 指定保存文件名字
getPreferenceManager().setSharedPreferencesName(PREFER_NAME);
addPreferencesFromResource(R.xml.tts_setting);
mSpeedPreference = (EditTextPreference) findPreference("speed_preference");
mSpeedPreference.getEditText().addTextChangedListener(new SettingTextWatcher(TtsSettings.this, mSpeedPreference, 0, 200));
}
@Override
public boolean onPreferenceChange(Preference preference, Object newValue) {
return true;
}
}
public class SettingTextWatcher implements TextWatcher {
private int editStart;
private int editCount;
private EditTextPreference mEditTextPreference;
int minValue;//最小值
int maxValue;//最大值
private Context mContext;
public SettingTextWatcher(Context context, EditTextPreference e, int min, int max) {
mContext = context;
mEditTextPreference = e;
minValue = min;
maxValue = max;
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
// Log.e("demo", "onTextChanged start:"+start+" count:"+count+" before:"+before);
editStart = start;
editCount = count;
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
// Log.e("demo", "beforeTextChanged start:"+start+" count:"+count+" after:"+after);
}
@Override
public void afterTextChanged(Editable s) {
if (TextUtils.isEmpty(s)) {
return;
}
String content = s.toString();
// Log.e("demo", "content:"+content);
if (isNumeric(content)) {
int num = Integer.parseInt(content);
if (num > maxValue || num < minValue) {
s.delete(editStart, editStart + editCount);
mEditTextPreference.getEditText().setText(s);
Toast.makeText(mContext, "超出有效值范围", Toast.LENGTH_SHORT).show();
}
} else {
s.delete(editStart, editStart + editCount);
mEditTextPreference.getEditText().setText(s);
Toast.makeText(mContext, "只能输入数字哦", Toast.LENGTH_SHORT).show();
}
}
/**
* 正则表达式-判断是否为数字
*/
public static boolean isNumeric(String str) {
Pattern pattern = Pattern.compile("[0-9]*");
return pattern.matcher(str).matches();
}
};
3、取值:
SharedPreferences mSharedPreferences = getSharedPreferences(TtsSettings.PREFER_NAME, MODE_PRIVATE);
String speedStr = mSharedPreferences.getString("speed_preference", "50")
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