Question

我的代码应用程序遇到了一些问题：我试图在活动中显示从数组中获取的图像列表但是当我尝试执行应用程序时我是空的在调试中没有错误的列表。谁能帮我？这是我的活动：

String [] vett;
ListView list;

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_techpuno);
    list=(ListView)findViewById(android.R.id.list);
    Intent intent = getIntent();
    vett=intent.getExtras().getStringArray("nomeImmagine");
    for(int i = 0;i<vett.length;i++){
    Log.d("test", vett[i]);}


    //list.setListAdapter(new AdapterTecniche(this, vett));
 list.setAdapter(new AdapterTecniche(this, R.layout.activity_techp,vett));
}

这是适配器：

public class AdapterTecniche extends ArrayAdapter<String> {
private final int resource;
private final String[] img;
public ImageLoader imageLoader;

    LayoutInflater inflater;

public AdapterTecniche(Context context,int resource, String[]img) {
    // your code
    super(context, R.layout.activity_techpuno);
    this.inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    this.context = context;
this.resource=resource;
    this.img=img;
    imageLoader=new ImageLoader(getContext().getApplicationContext());
        }

@Override
public View getView(int position, View convertView, ViewGroup parent) {

   ViewHolder viewHolder;

   View rowView = convertView;


    if(rowView == null) {
        Log.d("errore","Immagini non presenti");
    rowView = inflater.inflate(R.layout.immagini, parent, false);
    viewHolder=new ViewHolder();
    viewHolder.imageView=(ImageView) rowView.findViewById(R.id.list_image);
    rowView.setTag(viewHolder);
    }
    else
    {

    viewHolder=(ViewHolder)rowView.getTag();
    }

    if(img==null){
        Log.d("errore","Immagini non presenti");
    }else{

    int resourceId = context.getResources().getIdentifier(img[position],"drawable", context.getPackageName());
    for(int i=0;i<img.length;i++){
        Log.d("err", img[i]);
    }
    imageLoader.DisplayImage(resourceId, viewHolder.imageView);


    }
    return rowView;
    }
static class ViewHolder {
ImageView imageView;
}
}

Immagini.xml（每个图像布局）

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
    android:id="@+id/list_image"
    android:layout_width="80dp"
    android:layout_height="80dp"
    android:layout_centerVertical="true"
    android:layout_alignParentLeft="true"
    android:layout_gravity="center_horizontal" />
</LinearLayout>

活动布局：

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

<ListView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@android:id/list" />
</LinearLayout>

Answer 1

setContentView(R.layout.activity_techpuno);

应该在

之前

list=(ListView)findViewById(R.id.listView);

因为活动首先需要绑定/膨胀布局，之后您可以从中“找到”您的视图。

编辑使用ArrayAdapter(Context context, int resource, T[] objects)构造函数为其提供对象。或者覆盖getCount()，因为你的适配器不知道他有多少项。

列表图像为空

1 个答案: