Question

我正在尝试在片段中插入GridView。我开发了自定义适配器来填充gridview。现在一切正常，但gridview没有显示在片段中。我检查了 getCount（）方法它返回的总长度。这意味着数据存在，但没有显示。我对gridview很新，所以不知道为什么会这样。我尝试了以下答案，但他们也没有帮助我。 Android: getView in adapter never called

Custom Adapter getView() method is not called

Gridview not displaying in fragment

这是我的代码：

Tile Fragment Class：

public class TileFragment extends Fragment
{

public TileFragment(){
}

GridView gv;
Context context;
public static String [] prgmNameList={"Let Us C","c++","JAVA","Jsp","Microsoft .Net","Android","PHP","Jquery","JavaScript"};
public static int [] prgmImages={R.mipmap.dicover_disable,R.mipmap.discover_active, R.mipmap.home_disable,
                                 R.mipmap.home_active,R.mipmap.lists_disable,R.mipmap.lists_active,
                                 R.mipmap.profile_disable,R.mipmap.profile_active,R.mipmap.ic_search };

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

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
    @SuppressLint("InflateParams")
 //   View v = LayoutInflater.from(getActivity()).inflate(R.layout.tile_fragment, null);
    View v = inflater.inflate(R.layout.tile_fragment, container, false);
    gv = (GridView) v.findViewById(R.id.gridView1);
    gv.setAdapter(new CustomAdapter(getActivity(), prgmNameList,prgmImages));

    return v;
}

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

自定义适配器：

public class CustomAdapter extends BaseAdapter {

String [] result;
Context context;
int [] imageId;
private static LayoutInflater inflater=null;

public CustomAdapter(FragmentActivity tileFragment, String[] prgmNameList, int[] prgmImages) {

    result=prgmNameList;
    imageId=prgmImages;
    context = tileFragment;
    inflater = ( LayoutInflater )context.
            getSystemService(Context.LAYOUT_INFLATER_SERVICE);

}

@Override
public int getCount() {

    return imageId.length;
}

@Override
public Object getItem(int position) {
    return position;
}

@Override
public long getItemId(int position) {

    return position;
}

public class Holder
{
    TextView tv;
    ImageView img;
}
@SuppressLint("ViewHolder")
@Override
public View getView(final int position, View convertView, ViewGroup parent) {

    Holder holder=new Holder();
    View rowView;

    rowView = inflater.inflate(R.layout.programlist, null);
    holder.tv=(TextView) rowView.findViewById(R.id.textView1);
    holder.img=(ImageView) rowView.findViewById(R.id.imageView1);

    holder.tv.setText(result[position]);
    holder.img.setImageResource(imageId[position]);

    rowView.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {

            Toast.makeText(context, "You Clicked " + result[position], Toast.LENGTH_LONG).show();
        }
    });

    return rowView;
}
    }

tile_fragment：

<?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="match_parent" >

<GridView
    android:id="@+id/gridView1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentLeft="true"
    android:layout_below="@+id/textView1"
    android:numColumns="3"
    android:visibility="visible">

</GridView>

<TextView
    android:id="@+id/textView1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textSize="25sp"
    android:textStyle="bold"
    android:text=" Computer Languages..." />

   </RelativeLayout>

prgramlist

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

android:orientation="vertical" >

<ImageView
    android:id="@+id/imageView1"
    android:layout_gravity="center"
    android:layout_width="88dp"
    android:layout_height="88dp"
    android:layout_marginTop="5dp"
    android:layout_marginBottom="5dp"
    android:src="@mipmap/ic_launcher" />

<TextView
    android:id="@+id/textView1"
    android:layout_gravity="center"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textSize="15dp"
    android:layout_marginTop="5dp"
    android:layout_marginBottom="5dp"
    android:text="TextView" />

  </LinearLayout>

这就是我添加片段的方式：

HomeFragment：

public class HomeFragment extends Fragment
  {
public HomeFragment() {
}

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

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

    FragmentTabHost mTabHost = new FragmentTabHost(getActivity());
    mTabHost.setup(getActivity(), getChildFragmentManager());

    Bundle b = new Bundle();
    b.putString("key", "Tile");
    mTabHost.addTab(mTabHost.newTabSpec("tile").setIndicator("Tile"), TileFragment.class, b);
    //
    b = new Bundle();
    b.putString("key", "Map");
    mTabHost.addTab(mTabHost.newTabSpec("map").setIndicator("Map"), ProfileFragment.class, b);
    return mTabHost;
}

@Override
public void onActivityCreated(Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);
}
//
   }

任何帮助将不胜感激......

Answer 1

试试这个：

mTabHost.setup(getActivity(), getChildFragmentManager(), R.layout.my_parent_fragment);

其中R.layout.my_parent_fragment是您拥有tabhost的布局片段。

一旦您确认某个活动中GridView已正确显示，我们就可以推断Gridview Adapter不是问题FragmentTabHost，问题来自您的问题<div class="panel panel-primary" ng-repeat="device in home.devices"> <div class="panel-heading"> <h3 class="panel-title pull-right"> <a href="#settings"> <em class="fa fa-cog"></em> </a> </h3> <h3 class="panel-title" ng-bind="::device.name"></h3> </div> <div class="panel-body"> <div class="row"> <div class="col-lg-4 text-center" ng-repeat="sensor in device.sensors"> <div class="panel panel-default"> <div class="panel-body"> <h2 ng-if="device.type == 'bm'" ng-bind="t{{$parent.$index}}{{$index}}"></h2> t{{$parent.$index}}{{$index}} </div> </div> </div> </div> </div> </div>定义或设置。您正在从onCreateView（）返回tabHost，因为您必须在tabHost中设置布局或容器，如果不这样做，片段如何知道找到布局的位置？

有关详细信息，请参阅api here

Answer 2

尝试使用此布局。

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:orientation="vertical"
android:layout_height="match_parent" >

<GridView
    android:id="@+id/gridView1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:numColumns="3"
  >

</GridView>

<TextView
    android:id="@+id/textView1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textSize="25sp"
    android:textStyle="bold"
    android:text=" Computer Languages..." />

</LinearLayout>

Answer 3

无法找出问题的根源，但请尝试以下方法：

View rowView = convertView;
if(rowView != null) {
    rowView = inflater.inflate(R.layout.programlist, null);
}

Android GridView：适配器中的getView（）永远不会被调用

3 个答案: