java - 在android中访问从activity到fragment的imageview

Question

我必须开发一个 Android 应用程序。

这里我使用 fragment 概念。

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:id="@+id/_listDetails"
>

<RelativeLayout 

    android:layout_width="match_parent"
    android:layout_height="wrap_content"

    android:orientation="horizontal"

    android:id="@+id/layout"
     >
     <ImageView
        android:id="@+id/pos"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_vertical"
         android:layout_toLeftOf="@+id/neg"
        android:src="@drawable/a_pos_off" />
      <ImageView
        android:id="@+id/neg"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_vertical"
        android:layout_toLeftOf="@+id/imageView5"
        android:src="@drawable/a_neg_off" />



                       </RelativeLayout>

 <LinearLayout 
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_below="@+id/layout"
android:orientation="horizontal" >

 <fragment
  android:id="@+id/activity_main"
  android:name="com.xmlparsing.MainActivity"
  android:layout_width="0px"
  android:layout_height="match_parent"
  android:layout_weight="1" />
 <fragment
  android:id="@+id/fragment2"
  android:name="com.xmlparsing.SubCate"
  android:layout_width="0px"
  android:layout_height="match_parent"
  android:layout_weight="1" />
  </LinearLayout>
  </RelativeLayout>

这里我使用了两个 fragment ..它们是.、MainActivity.java和SubCate.java

  public class AndroidListFragmentActivity extends Activity {

   /** Called when the activity is first created. */
  @Override
   public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.fragment);
       }}

这里正像图像位于fragment.xml文件中...这里如果我必须单击这些正像图像，这意味着必须增加第二个 fragment (SubCate.java)的完整内容的文本大小...

我该怎么办？？？请给我这些问题的解决方案...

这是我的第二个 fragment (SubCate.java) 代码:

 @TargetApi(Build.VERSION_CODES.HONEYCOMB)
 public class SubCate extends  Fragment
 {
    int count = 0, i, j;
 WebSettings webSettings;
    WebView fullcontent;
     ImageView positive,negative;
    AndroidListFragmentActivity _listDetailsFrag;
    View activityView;

      @Override
  public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);

  }     

    @Override
  public View onCreateView(LayoutInflater inflater, ViewGroup container, 
    Bundle savedInstanceState) {

    View view = inflater.inflate(R.layout.subcate,
            container, false);



    fullcontent = (WebView) view.findViewById(R.id.fullcontent);

    Bundle bundle = getArguments();
    return view;

        }



       public void updateDetail(String articlefullcontent) {

        _FullContent = articlefullcontent.substring(1);
        fullcontent.setWebChromeClient(new WebChromeClient());
             webSettings = fullcontent.getSettings();


            fullcontent.getSettings();
            fullcontent.loadDataWithBaseURL(null, _FullContent, "text/html", "utf-8", null);

      positive  = ((ImageView )activityView.findViewById(R.id.pos));
             positive.setOnClickListener(new OnClickListener() {


                public void onClick(View v) {
                    count++;

                        if (count == -1)
                        {
                        webSettings.setTextSize(WebSettings.TextSize.SMALLER);
                        positive.setImageResource(R.drawable.a_pos_off);
                        negative.setImageResource(R.drawable.a_neg_on);
                        }
                        else
                            if (count == 0)
                        {
                            webSettings.setTextSize(WebSettings.TextSize.NORMAL);
                            positive.setImageResource(R.drawable.a_pos_off);
                            negative.setImageResource(R.drawable.a_neg_off);
                        }
                        else
                if (count >= 1)
                {   count=1;
                    webSettings.setTextSize(WebSettings.TextSize.LARGER);
                    positive.setImageResource(R.drawable.a_pos_on);
                    negative.setImageResource(R.drawable.a_neg_off);
                }


            } 
            }); 
              }
            }

我必须运行该应用程序并单击该 ImageView 意味着完整内容文本不会增加值...我该怎么办？？？请帮助我并为我提供一些解决方案???

Answer 1

您的fragment找不到对应的ImageView。编辑到下一个并检查:

positive = (ImageView )getActivity().findViewById(R.id.pos);//use getActivity() Method