本文介绍SharedPreferences及PreferenceActivity、PreferenceFragment。
1、SharedPreferences简单使用示例
public class MainActivity extends Activity {
private static final String TAG = MainActivity.class.getSimpleName();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getWindow().setContentView(R.layout.activity_main);
//all apps sharing the same user ID
SharedPreferences sp = getPreferences(Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sp.edit();
//save 5 kinds of datas: boolean,int,long,float,String
editor.putBoolean("isMan", true);
editor.putFloat("weight", 68f);
editor.putInt("age", 25);
editor.putLong("salary", 10000L);
editor.putString("name", "Victor");
Set<String> relatives = new HashSet<String>();
editor.putStringSet("relatives", relatives);
// editor.apply();//asynchronous,main thread
long start = SystemClock.elapsedRealtime();
editor.commit();
Log.i(TAG, "commit:"+(SystemClock.elapsedRealtime()-start)+"ms");
}
public void onClick(View v){
switch (v.getId()) {
case R.id.btn:
Log.i(TAG, "getLocalClassName()="+getLocalClassName());
SharedPreferences sp = getSharedPreferences(getLocalClassName(), Context.MODE_PRIVATE);
sp.getBoolean("isMan", false);
sp.getFloat("weight", 60);
sp.getInt("age", 16);
sp.getLong("salary", 6000L);
sp.getString("name", "none");
sp.getStringSet("relatives", null);
Map<String, ?> map = sp.getAll();
if(sp.contains("salary")){
long salary = (Long) map.get("salary");
Log.i(TAG, "contains:"+salary);
}
}
}
}
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
xmlns:android="http://schemas.android.com/apk/res/android">
<Button
android:id="@+id/btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="get"
android:onClick="onClick"/>
</LinearLayout>
2、PreferenceActivity、PreferenceFragment使用示例
1) MyFragmentPreferenceActivity.java
public class MyFragmentPreferenceActivity extends PreferenceActivity implements OnSharedPreferenceChangeListener{
private static final String TAG = MyFragmentPreferenceActivity.class.getSimpleName();
@Override
public void onBuildHeaders(List<Header> target) {
super.onBuildHeaders(target);
loadHeadersFromResource(R.xml.preferenceheaders, target);
//getPackageName()+"_preferences"
SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
sharedPreferences.registerOnSharedPreferenceChangeListener(this);
}
@Override
public void onSharedPreferenceChanged(SharedPreferences sharedPreferences,
String key) {
if(key.equals("CheckBox")){
boolean value = sharedPreferences.getBoolean(key, false);
Log.i(TAG, "CheckBox:"+value);
}else if(key.equals("ListPreference")){
String value = sharedPreferences.getString(key, null);
Log.i(TAG, "ListPreference:"+value);
}else if(key.equals("MultiSelectListPreference")){
Set<String> values = sharedPreferences.getStringSet("MultiSelectListPreference", null);
Log.i(TAG, "MultiSelectListPreference:"+values);
}else if(key.equals("RingtonePreference")){
String value = sharedPreferences.getString("RingtonePreference", null);
//content://media/internal/audio/media/49
Log.i(TAG, "RingtonePreference:"+value);
}
}
}
2) preferenceheaders.xml
preference-headers作为顶级标签，包含多个header
<?xml version="1.0" encoding="utf-8"?>
<preference-headers
xmlns:android="http://schemas.android.com/apk/res/android">
<header
android:fragment="com.qinuli.buttontest2.MyPreferenceFragment"
android:title="My header"
android:icon="@drawable/ic_launcher"
android:summary="description of header"/>
<header
android:title="Intent"
android:summary="launch an intent">
<intent android:action="android.settings.DISPLAY_SETTINGS"/>
</header>
</preference-headers>
3) MyPreferenceFragment.java
public class MyPreferenceFragment extends PreferenceFragment {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.userpreferences);
}
}
4) userpreferences.xml
PreferenceScreen作为顶级标签，包含多个PreferenceCategory
<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen
xmlns:android="http://schemas.android.com/apk/res/android">
<PreferenceCategory
android:title="Category1">
<CheckBoxPreference
android:key="CheckBox"
android:title="CheckBox"
android:summaryOn="laugh"
android:summaryOff="cry"
android:defaultValue="true"/>
<ListPreference
android:key="ListPreference"
android:title="ListPreference"
android:summary="many things, but you can only choose one"
android:entries="@array/mylist"
android:entryValues="@array/myvalues"/>
<PreferenceScreen
android:title="PreferenceScreen"
android:summary="child screen">
<SwitchPreference
android:key="SwitchPreference"
android:title="SwitchPreference"
android:summaryOn="Active"
android:summaryOff="Deactive"
android:switchTextOn="Good"
android:switchTextOff="Bad"/>
</PreferenceScreen>
</PreferenceCategory>
<PreferenceCategory
android:title="Category2">
<EditTextPreference
android:key="EditText"
android:title="EditText"
android:summary="input something"
android:defaultValue="fantastic job!"/>
<MultiSelectListPreference
android:key="MultiSelectListPreference"
android:title="MultiSelectListPreference"
android:summary="you can choose as many as you want"
android:entries="@array/mylist"
android:entryValues="@array/myvalues"/>
<RingtonePreference
android:key="RingtonePreference"
android:title="RingtonePreference"
android:summary="select your favourite ringtone"/>
</PreferenceCategory>
<PreferenceScreen
android:title="Intent"
android:summary="launch an intent">
<intent android:action="android.settings.WIFI_SETTINGS"/>
</PreferenceScreen>
</PreferenceScreen>
5) strings.xml
ListPreference引用的资源
<resources>
<string name="app_name">ButtonTest2</string>
<string-array name="mylist">
<item >good</item>
<item >great</item>
<item >nice</item>
<item >fine</item>
<item >beautiful</item>
<item >pretty</item>
</string-array>
<string-array name="myvalues">
<item >_GOOD</item>
<item >_GREAT</item>
<item >_NICE</item>
<item >_FINE</item>
<item >_BEAUTIFUL</item>
<item >_PRETTY</item>
</string-array>
</resources>
时间： 2024-10-26 01:01:10