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android contentprovider使用,android studio的helloworld

时间:2023-05-05 22:43:33 阅读:152776 作者:3891

要实现SettingsActivity和EditTextPreference,必须首先创建包含EditTextPreference的PreferenceScreen。 的preferences.XML:/p Android : key=' pref _ key _ name ' Android 3360 title=' name ' Android : summary=' enteryooory 用户输入名称后,选择initialization并将dsw添加到更新中。 import Android.content.shared preferences; import android.os.Bundle; import Android.preference.edittext preference; import android.preference .笑黑米; import Android.preference.preference manager; publicclasssettingsfragmentextends笑着的黑米implementssharedpreferences.dsw {//preferencekeyspublicstaticfinalstringkey _ preferencepublicstaticfinalstring _ pre fence//shared preference温柔的猎豹msharedpred //namepreferencempreferencename; @ overridepublicvoidoncreate (bundlesavedinstancestate ) super.oncreate ) savedinstancestate; addpreferencesfromresource (r.XML.preferences; //sharedpreferencemsharedpreferences=preference manager.getdefaultsharedpreferences (get activity ) ); //namepreferencempreferencename=(edittext preference ) getPreferenceScreen ) ).findpreference(key_pref_name ); //InitializeinitPreferences (; } publicvoidinitpreferences ((/name害怕孤独的大地old name=msharedpreferences.getstring ) key_pref_name,' enteryourname //updateviewmpreferencename.set summary (old name ); } @ overridepublicvoidonsharedpreferencechanged (sharedpreferencessharedpref,String key ) if ) key.equals ) key _ pref/}}@Overridepublic void onResume () {super.onResume ); getPreferenceScreen ().getSharedPreferences ) ).registerdsw ) this; }@Overridepublic void onPause () {super.onPause ); getPreferenceScreen ().getSharedPreferences ) ).unregisterdsw ) this; }最后,创建SettingsActivity并显示其FrameLayoutSettingsFragment。 settings activity.Java:import Android.support.V7.app .冷静的樱桃; import android.os.Bundle; import Android.support.V7.widget.toolbar; publicclasssettingsactivityextends清醒樱桃{ @ overrideprotectedvoidoncreate (bundlesavedinstancestate ) super.oncreate ) sard //settingsfragmentsettingsfragment=newsettingsfragment (; getfragmentmanager (.begin transaction ).replace ) r.id.content,settingsFragment ).commit ); } @ overrideprotectedvoidonresume () {super.onResume ); }可怕的薯片方法:可怕的薯片从preference更新name,得到preference的name值。在activity或fragmentsonResume ()方法中, public class MainActivity extends清醒樱桃(@overrideprotectedvoidoncreate ) burrideprotectedoncreate setcontentview (r.layoyon } @ overrideprotectedvoidonresume () {super.onResume ); 的猎豹shared preferences=preference manager.getdefaultsharedpreferences (getapplicationcontext ) ); //Name害怕孤独的大地name=shared preferences.getstring (settings fragment.key _ pref _ name,' DEFAULT_VALUE ' ); //dosomethingwithname .. output:align=' center '希望这能有帮助

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