如何保存android内容视图的修改内容？

问题描述：

我已经实现了具有多个布局的多个复选框的应用程序。当用户未选中相关的复选框时，我看不到布局。然后我试图在用户重新启动应用程序时保存内容和设置。如何保存android内容视图的修改内容？

我已经实现的代码如下：

public class MultipleControllsActivity extends Activity { 
/** Called when the activity is first created. */ 

LinearLayout l1,l2,l3; 



@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 

    l1 = ((LinearLayout)findViewById(R.id.linearLayout1)); 
    l2 = ((LinearLayout)findViewById(R.id.linearLayout2)); 
    l3 = ((LinearLayout)findViewById(R.id.linearLayout3)); 

    ((CheckBox)findViewById(R.id.checkBox1)).setOnCheckedChangeListener(new OnCheckedChangeListener() { 

     @Override 
     public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { 

      if(!isChecked){ 
      l1.setVisibility(View.GONE);  
      } 
     } 
    }); 


    ((CheckBox)findViewById(R.id.checkBox2)).setOnCheckedChangeListener(new OnCheckedChangeListener() { 

     @Override 
     public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { 

      l2.setVisibility(View.GONE); 
     } 
    }); 


    ((CheckBox)findViewById(R.id.checkBox3)).setOnCheckedChangeListener(new OnCheckedChangeListener() { 

     @Override 
     public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { 

      l3.setVisibility(View.GONE); 
     } 
    }); 


    ((Button)findViewById(R.id.saveTemp)).setOnClickListener(new OnClickListener() { 

     @Override 
     public void onClick(View v) { 

      //Save the content code here 

     } 
    }); 

}

}

当我在saveTemp按钮点击的话，我想保存的内容，如果用户重新启动应用程序，然后保存的内容将会出现。

请任何机构帮我...

能否请你更形象地解释你的问题。根据我的理解，您想要存储CheckBox的状态，以便下次用户启动应用程序时它应该以原样启动。这是对的还是你的意思是别的？ – 2012-03-22 07:22:28

是的，我的意思是 – 2012-03-22 08:22:20

答

您可以使用

SharedPreferences

http://developer.android.com/reference/android/content/SharedPreferences.html

使用： -

 public class MultipleControllsActivity extends Activity { 
    /** Called when the activity is first created. */ 

    LinearLayout l1,l2,l3; 



    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 
    SharedPreferences pref_settings; 
    pref_settings = getSharedPreferences("DATA", Context.MODE_PRIVATE); 
     l1 = ((LinearLayout)findViewById(R.id.linearLayout1)); 
     l2 = ((LinearLayout)findViewById(R.id.linearLayout2)); 
     l3 = ((LinearLayout)findViewById(R.id.linearLayout3)); 
l1.setVisibility(pref_settings.getInt("l1", 0)); 
l2.setVisibility(pref_settings.getInt("l2", 0)); 
l2.setVisibility(pref_settings.getInt("l3", 0)); 

     ((CheckBox)findViewById(R.id.checkBox1)).setOnCheckedChangeListener(new OnCheckedChangeListener() { 

      @Override 
      public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { 

       if(!isChecked){ 
       l1.setVisibility(View.GONE);  
       } 
      } 
     }); 


     ((CheckBox)findViewById(R.id.checkBox2)).setOnCheckedChangeListener(new OnCheckedChangeListener() { 

      @Override 
      public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { 

       l2.setVisibility(View.GONE); 
      } 
     }); 


     ((CheckBox)findViewById(R.id.checkBox3)).setOnCheckedChangeListener(new OnCheckedChangeListener() { 

      @Override 
      public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { 

       l3.setVisibility(View.GONE); 
      } 
     }); 


     ((Button)findViewById(R.id.saveTemp)).setOnClickListener(new OnClickListener() { 

      @Override 
      public void onClick(View v) { 

       SharedPreferences pref_settings; 
    pref_settings = getSharedPreferences("DATA", Context.MODE_PRIVATE); 
      SharedPreferences.Editor editor = pref_settings.edit(); 


       editor.putInt("l1", l1.getVisibility()); 
    editor.putInt("l2", l2.getVisibility()); 
    editor.putInt("l3", l3.getVisibility()); 

       editor.commit(); 

      } 
     }); 

    }

答

下面是一个例子我使用多选列表视图实现了什么，甚至是t霍夫我不使用复选框直接你可能会得到一个轻微的想法如何继续.. 您可以保存您的喜好这样的...

public void SaveSelections() { 
    SharedPreferences sp = getPreferences(MODE_PRIVATE); 
    SharedPreferences.Editor prefEditor = sp.edit(); 
    String savedItems = getSavedItems(); 
    prefEditor.putString(LOAD_LIST, savedItems); 
    prefEditor.commit(); 
} 

private String getSavedItems() { 
    String savedItems = ""; 
    int count = listView.getAdapter().getCount(); 
    for (int i = 0; i < count; i++) { 
     if (listView.isItemChecked(i)) { 
      if (savedItems.length() > 0) { 
       savedItems += "," + listView.getItemAtPosition(i); 
      } else { 
       savedItems += listView.getItemAtPosition(i); 
      } 
     } 
    } 
    return savedItems; 
}

这里是加载您的选择的方法..

private void LoadSelections() { 
     SharedPreferences sp = getPreferences(MODE_PRIVATE); 
     if (sp.contains(LOAD_LIST)) { 
      String savedItems = sp.getString(LOAD_LIST, ""); 
      this.selectedItems.addAll(Arrays.asList(savedItems.split(","))); 
      int count = this.listView.getAdapter().getCount(); 
      for (int i = 0; i < count; i++) { 
       String currentItem = (String) listView.getAdapter().getItem(i); 
       if (this.selectedItems.contains(currentItem)) { 
        this.listView.setItemChecked(i, true); 
       } 

      } 
     } 
    }

然后在OnCreate中调用LoadSelections（）这样使...

Bundle b = new Bundle(); 
checkedItems = listView.getCheckedItemPositions(); 
final int checkedItemsCount = checkedItems.size(); 
lst = new ArrayList<String>(); 
for (int i = 0; i < checkedItemsCount; ++i) { 
// This tells us the item position we are looking at 
final int position = checkedItems.keyAt(i); 
final String str2 = (String) listView.getItemAtPosition(position); 
lst.add(str2); 
} 
SaveSelections();

最后调用LoadSelections在OnCreate中这样

LoadSelections（）;

如何保存android内容视图的修改内容？

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