Question

我已经查看了各种与复选框相关的问题，但仍在努力寻找适合我的问题的答案。我有一个正常的复选框要求，供用户检查和取消选中。 '图层'由。检查用户将在背景地图中可见，未选中的部分将不可见。

我的问题是我无法正确维护状态，以确定何时必须检查哪些复选框每次都会打开对话框。目前，假设我检查第1层和第5层并将它们设置为可见然后我取消选中后面的第1层，以便消失1; 1和5都消失了。我觉得这可能是由于我用来设置布尔值的全局变量。如果有人能帮助我会很棒。感谢。

The following is the UI representation

布局layer_checkbox.xml：

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content" > 

            <TextView
              android:id="@+id/label"
              android:layout_width="wrap_content"
              android:layout_height="wrap_content"
              android:layout_toRightOf="@+id/check"
              android:text="@+id/label"
              android:textSize="20sp"
              android:padding="8dp"
              android:textColor="#0d00ff" >
           </TextView>

          <CheckBox
             android:id="@+id/check"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:layout_alignParentLeft="true"
             android:layout_marginLeft="4px"
             android:layout_marginRight="10px" 
             >
          </CheckBox>    

</RelativeLayout>

以下是我的方法： 1.方法initLayerManagementDialog（）：

//These two are global variables.
  public CharSequence[] charSequenceItems;
  public boolean checked1[];

 //This method is called when the Layers option is clicked.
  public void initLayerManagementDialog()
{
   AlertDialog.Builder builder = new AlertDialog.Builder(this);
   builder.setTitle("Layers"); 
   AlertDialog dialog;
   charSequenceItems = map.getLayerList().toArray(new   CharSequence[map.getLayerList().size()]);       
    final boolean [] checked = new boolean[charSequenceItems.length];
    checked1 = new boolean[charSequenceItems.length];

   LayerAdapter ladapter = new LayerAdapter(myInstance.mApplicationContext,   map.getLayerList());     
   builder.setAdapter(ladapter,new DialogInterface.OnClickListener() {

   //This is an empty onClick method. Looking for a cleaner way to avoid this.
    @Override
    public void onClick(DialogInterface dialog, int which) {
        System.out.println("CheckBox button Clicked>>>");           
    }       
   });                 
   builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
       @Override
       public void onClick(DialogInterface dialog, int id) {                 
         for(int i = 0; i < map.getLayerList().size();i++){                     
             map.setLayerVisibility(  map.getLayerByName(map.getLayerList().get(i)).getName(), checked1[i]);
         }                                       
         mapView.invalidate();    

       }
   });     
   builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
       @Override
       public void onClick(DialogInterface dialog, int id) {                            
       }
   });

   dialog=builder.create();
   dialog.show();
   dialog.setCanceledOnTouchOutside(true);
 }

自定义适配器：

    public class LayerAdapter extends ArrayAdapter {
  private Context context;
  private List<String> SymbolList;
  boolean isChecked = false;

  public LayerAdapter(Context pContext, List<String> pSymbolList)
  {
    super(pContext, R.layout.layer_checkbox, pSymbolList); 
    this.context = pContext;
    this.SymbolList = pSymbolList;
  }

  @Override
  public View getView(int position, View convertView, ViewGroup parent) {
    LayoutInflater inflater = (LayoutInflater) context
        .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    View rowView = inflater.inflate(R.layout.layer_checkbox, parent, false);
    final CheckBox cb  = (CheckBox) rowView.findViewById(R.id.check);
    cb.setChecked(map.getLayerByName(map.getLayerList().get(position)).getVisibility());
    TextView textView = (TextView) rowView.findViewById(R.id.label);
    textView.setText(SymbolList.get(position));  
    final int posit = position;                    
    cb.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {   
            if (((CheckBox) v).isChecked()) {       
                checked1[posit] = true;      

            } else {    

                checked1[posit] = false;
            }   

        }
    });     

    return rowView;
    }
    }

布局xml：http://pastebin.com/hKbnTBNG

Answer 1

您不需要使用适配器，因为“对话框”构建器可以自动为您创建复选框列表。您也不需要为数组使用成员变量。

public void initLayerManagementDialog()
{
    AlertDialog.Builder builder = new AlertDialog.Builder(this);
    builder.setTitle("Layers"); 
    final CharSequence[] charSequenceItems = map.getLayerList().toArray(new CharSequence[map.getLayerList().size()]);       
    final boolean [] checkedItems = new boolean[charSequenceItems.length];

    for (int i=0; i<checkedItems.length; i++){
        checkedItems[i] = map.getLayerByName(map.getLayerList().get(i).getVisibility());
    }

    builder.setMultiChoiceItems(charSequenceItems, checkedItems, new OnMultiChoiceClickListener(){
        @Override
        public void onClick(DialogInterface dialog, int indexSelected,
                boolean isChecked) {
            checkedItems[indexSelected] = isChecked;
        }
    }); 

    builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int id) {                 
            for(int i = 0; i < map.getLayerList().size();i++){                     
            map.setLayerVisibility(  map.getLayerByName(map.getLayerList().get(i)).getName(), checkedItems[i]);
            }                                       
            mapView.invalidate();    
        }
    });     

    builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int id) {                            
        }
    });

    AlertDialog dialog=builder.create();
    dialog.show();
    dialog.setCanceledOnTouchOutside(true);
}

如果你很好奇为什么你的方法不起作用，也许是因为在你的getView方法中，你每次都直接从地图获得状态，但是你没有立即更新地图状态单击复选框。因此，如果在包含复选框的视图上调用getView，它将重置为打开对话框之前的值。旋转屏幕时会出现问题，或者如果您有足够的图层，则必须滚动列表以查看所有图层。

如何感知动态android复选框点击并保存状态

1 个答案: