嘗試從SharedPreferences中設置元素狀態，但僅應用默認值

Question

好吧，我正在嘗試進行設置活動，但這樣做並不順利。現在它只有一個顯示爲Spinner的設置。

我已成功將所選項目保存到SharedPreferences，但我無法弄清楚如何使活動將保存的數據應用於開始的視圖。 我想要應用任何int與關鍵「spinnerPosition」配對Spinner.setSelection();，但默認值sharedPreferences.getInt(String key, int defValue);覆蓋它。

這裏是文件sharedPreferences保存到：

<?xml version='1.0' encoding='utf-8' standalone='yes' ?> <map> <string>com.example.SettingsActivity$1@277a0f70</string> <string name="finalWeighType">Pounds</string> <int name="spinnerPosition" value="1" /> </map> 和一些logcat的：

04-04 18:21:13.849: D/spinner Listener(9027): ok 04-04 18:21:15.035: D/onPause(9027): Saving Settings 04-04 18:21:15.035: I/System.out(9027): iSavedPos: 9 04-04 18:21:19.030: W/InputEventReceiver(9027): Attempted to finish an input event but the input event receiver has already been disposed. 04-04 18:21:19.036: I/System.out(9027): iSavedPos 9 04-04 18:21:19.037: D/Do(9027): running 04-04 18:21:19.037: D/pos def(9027): ok 04-04 18:21:19.404: D/spinner Listener(9027): ok

import android.content.Context; 
import android.content.SharedPreferences; 
import android.os.Bundle; 
import android.support.v7.app.ActionBarActivity; 
import android.util.Log; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.view.View; 
import android.widget.AdapterView; 
import android.widget.ArrayAdapter; 
import android.widget.Spinner; 
import android.widget.Toast; 


public class SettingsActivity extends ActionBarActivity{ 
private Spinner selectWeighType; 
SharedPreferences weighTypeLoader; 
String finalWeighType; 
public static final String DEFAULT = "UNSET"; 
public int itemSelectedPosition; 
SharedPreferences getItemSavedPosition; 
private int itemSavedPosition; 
private boolean populated = false; 



@Override 
protected void onCreate(Bundle savedInstanceState){ 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_settings); 
    // add items to selectWeighType Spinner 
    populateSelectWeighType(); 
    // add listener to selectWeightType Spinner 
    selectWeighTypeListener(); 
    weighTypeLoader = getSharedPreferences("weightType", Context.MODE_PRIVATE); 
    //Load saved data.. hopefully 
    getItemSavedPosition = getSharedPreferences("weightType", Context.MODE_PRIVATE); 
    itemSavedPosition = getItemSavedPosition.getInt("spinnerPosition", 9); 
    System.out.println("iSavedPos " + itemSavedPosition); 

} 

@Override 
protected void onResume() { 
    super.onResume(); 
    do {Log.d("Do", "running"); 
     switch (itemSavedPosition) { 
      case 0: 
       selectWeighType.setSelection(0); 
       Log.d("pos 0", "ok"); 
       break; 
      case 1: 
       selectWeighType.setSelection(1); 
       Log.d("pos 1", "ok"); 
       break; 
      case 2: 
       selectWeighType.setSelection(2); 
       Log.d("pos 2", "ok"); 
       break; 
      default: 
       selectWeighType.setSelection(1); 
       Log.d("pos def", "ok"); 
     } 
     populated = true; 
    }while(populated == false); 
} 

public void populateSelectWeighType(){ 
    selectWeighType = (Spinner) findViewById(R.id.weight_type_spinner); 


    ArrayAdapter<CharSequence> selectWeighTypeAdapter = 
      ArrayAdapter.createFromResource(this, 
        R.array.weight_type_select, 
        android.R.layout.simple_spinner_item); 
    selectWeighTypeAdapter.setDropDownViewResource(
      android.R.layout.simple_spinner_dropdown_item); 
    selectWeighType.setAdapter(selectWeighTypeAdapter); 

} 
public void selectWeighTypeListener(){ 
    selectWeighType = (Spinner) findViewById(R.id.weight_type_spinner); 

    selectWeighType.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { 
     @Override 
     public void onItemSelected(AdapterView<?> parent, View view, int position, long id) { 
      String weighTypeSelected = parent.getItemAtPosition(position).toString(); 
      itemSelectedPosition = position; 
      int rowID = (int) id; 
      Log.d("spinner Listener", "ok"); 
     } 

     @Override 
     public void onNothingSelected(AdapterView<?> parent) { 

     } 

    }); 
} 

@Override 
public boolean onCreateOptionsMenu(Menu menu) { 
    // Inflate the menu; this adds items to the action bar if it is present. 
    getMenuInflater().inflate(R.menu.menu_settings, menu); 
    return true; 
} 

@Override 
public boolean onOptionsItemSelected(MenuItem item) { 
    // Handle action bar item clicks here. The action bar will 
    // automatically handle clicks on the Home/Up button, so long 
    // as you specify a parent activity in AndroidManifest.xml. 
    int id = item.getItemId(); 
    Toast weightTypeToast; 

    //noinspection SimplifiableIfStatement 
    if (id == R.id.action_settings) { 
     return true; 
    } 

    return super.onOptionsItemSelected(item); 
} 

@Override 
protected void onPause() { 
    super.onPause(); 
    SharedPreferences commitWeighSetting = getSharedPreferences("WeightType", Context.MODE_PRIVATE); 
    SharedPreferences.Editor editSetting = commitWeighSetting.edit(); 
    editSetting.putString("WeighType", 
      selectWeighType.getSelectedItem().toString()); 
    editSetting.putInt("spinnerPosition", itemSelectedPosition); 
    editSetting.commit(); 
    Log.d("onPause", "Saving Settings"); 
    System.out.println("iSavedPos: " + itemSavedPosition); 

} 

} 

佈局XML

<GridLayout 
xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:tools="http://schemas.android.com/tools" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
android:paddingLeft="@dimen/activity_horizontal_margin" 
android:paddingRight="@dimen/activity_horizontal_margin" 
android:paddingTop="@dimen/activity_vertical_margin" 
android:paddingBottom="@dimen/activity_vertical_margin" 
tools:context="com.example.SettingsActivity" 
> 

<TextView 
    android:id="@+id/weight_type_setting_title" 
    android:text="@string/weight_type_setting_title" 
    android:textSize="18dp" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_alignBottom="@+id/weight_type_spinner" 
    android:layout_alignParentLeft="true" 
    android:layout_alignParentStart="true" 
    android:layout_gravity="center_horizontal" 
    android:layout_row="0" 
    android:layout_column="0" 
    android:layout_columnWeight="0" 
    android:layout_marginLeft="16dp" /> 

<Spinner 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:id="@+id/weight_type_spinner" 
    android:layout_alignParentTop="true" 
    android:layout_toRightOf="@+id/weight_type_setting_title" 
    android:layout_toEndOf="@+id/weight_type_setting_title" 
    android:layout_row="0" 
    android:layout_column="1" 

    android:spinnerMode="dropdown" 
    android:layout_columnWeight="0" 
    android:layout_marginRight="16dp" 
    android:layout_gravity="center_horizontal" /> 
</GridLayout> 

Answer 1

你想讀spinnerPosition值SharedPreferences實例名稱spinnerPosition，同時節省spinnerPosition值爲SharedPreferences名稱WeightType。您應該從名稱爲WeightType的SharedPreferences實例中讀取spinnerPosition值，或將其保存到名稱爲spinnerPosition的SharedPreferences實例。