獲取listPreference選擇的項目。 Android

Question

我正在運行一項服務。在此我想讀取啓動它的應用程序的首選項。儘管我可以閱讀其他偏好。我無法讀取列表首選項中的選定項目。請幫忙。代碼或相關鏈接表示讚賞。 在此先感謝。

Answer 1

創建文件夾/ RES /值的XML文件arrays.xml/

<?xml version="1.0" encoding="utf-8"?> 
    <resources> 
    <string-array name="listDisplayWord"> 
    <item>Option 1</item> 
    <item>Option 2</item> 
    <item>Option 3</item> 
    </string-array> 
    <string-array name="listReturnValue"> 
    <item>1 is selected</item> 
    <item>2 is selected</item> 
    <item>3 is selected</item> 
    </string-array> 
    </resources> 

在文件夾/ RES/XML/

<?xml version="1.0" encoding="utf-8"?> 
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"> 
<ListPreference 
    android:title="List Preference" 
    android:summary="Select the option of the list" 
    android:key="listPref" 
    android:entries="@array/listDisplayWord" 
    android:entryValues="@array/listReturnValue" /> 
</PreferenceScreen> 

創建SetPreferences.java創建的preferences.xml

package com.exercise.AndroidListPreference; 
import com.exercise.AndroidListPreference.R; 

import android.os.Bundle; 
import android.preference.PreferenceActivity; 

public class SetPreferences extends PreferenceActivity { 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    // TODO Auto-generated method stub 
    super.onCreate(savedInstanceState); 
    addPreferencesFromResource(R.xml.preferences); 
} 
} 

主代碼

package com.exercise.AndroidListPreference; 

import android.app.Activity; 
import android.content.Intent; 
import android.content.SharedPreferences; 
import android.os.Bundle; 
import android.preference.PreferenceManager; 
import android.view.View; 
import android.widget.Button; 
import android.widget.TextView; 
import android.widget.Toast; 

public class AndroidListPreference extends Activity { 

TextView myListPref; 

    /** Called when the activity is first created. */ 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 
     myListPref = (TextView)findViewById(R.id.list_pref); 
     Button buttonSetPreference = (Button)findViewById(R.id.setpreference); 

     buttonSetPreference.setOnClickListener(new Button.OnClickListener(){ 

    @Override 
    public void onClick(View v) { 
    // TODO Auto-generated method stub 
    startActivity(new Intent(AndroidListPreference.this, SetPreferences.class)); 
    }}); 
    } 

@Override 
protected void onResume() { 
    // TODO Auto-generated method stub 
    super.onResume(); 
    Toast.makeText(this, "onResume", Toast.LENGTH_LONG).show(); 
    SharedPreferences myPreference=PreferenceManager.getDefaultSharedPreferences(this); 
    String myListPreference = myPreference.getString("listPref", "default choice"); 
    myListPref.setText(myListPreference); 
} 
} 

也有修改的AndroidManifest.xml包括SetPreferences.java

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
    package="com.exercise.AndroidListPreference" 
    android:versionCode="1" 
    android:versionName="1.0"> 
    <application android:icon="@drawable/icon" android:label="@string/app_name"> 
     <activity android:name=".AndroidListPreference" 
       android:label="@string/app_name"> 
      <intent-filter> 
       <action android:name="android.intent.action.MAIN" /> 
       <category android:name="android.intent.category.LAUNCHER" /> 
      </intent-filter> 
     </activity> 
    <activity android:name=".SetPreferences" /> 
    </application> 
    <uses-sdk android:minSdkVersion="4" /> 

</manifest>