Question

我正在使用GridView和自定义适配器（MenuAdapter）来显示一些文本和图片，但是当我启动活动时，它不会显示这些项目。

MenuAdapter：

private Context mContext;
private final String[] gridViewString;
private final int[] gridViewImageId;

public MenuAdapter(Context context, String[] gridViewString, int[] gridViewImageId) {
    this.mContext = context;
    this.gridViewImageId = gridViewImageId;
    this.gridViewString = gridViewString;
}

@Override
public int getCount() {
    return 0;
}

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

@Override
public long getItemId(int position) {
    return 0;
}

public String[] getGridViewString() {
    return gridViewString;
}

public int[] getGridViewImageId() {
    return gridViewImageId;
}

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

    LayoutInflater inflater = (LayoutInflater) this.mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

    if (convertView == null) {
        view = new View(this.mContext);
        view = inflater.inflate(R.layout.gridview_layout, null);
        TextView text = (TextView) view.findViewById(R.id.grid_text);
        ImageView image = (ImageView) view.findViewById(R.id.grid_image);
        text.setText(this.gridViewString[position]);
        image.setImageResource(this.gridViewImageId[position]);
    } else {
        view = convertView;
    }

    return view;
}

MenuActivity：

private GridView gridViewMenu;
private MenuAdapter adapter;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_menu);

    String[] gridViewString = {
            getString(R.string.coke),
    } ;

    int[] gridViewImageId = {
            R.drawable.campione,
    };

    this.adapter = new MenuAdapter(this, gridViewString, gridViewImageId);
    this.gridViewMenu = (GridView) findViewById(R.id.gridView_menu);
    this.gridViewMenu.setAdapter(this.adapter);
    this.gridViewMenu.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view,
                                int position, long id) {
            Toast.makeText(MenuActivity.this, "GridView Item: " + adapter.getGridViewString()[position], Toast.LENGTH_LONG).show();

            // Clicked item index
            int itemPosition = position;
            Intent iback = new Intent(view.getContext(), MainPageActivity.class);
            iback.putExtra(MainPageActivity.EXTRA_SELECTED_VALUE, itemPosition);
            setResult(Activity.RESULT_OK, iback);
            finish();

        }
    });
}

gridview_layout.xml：

<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/grid_image"
    android:layout_width="88dp"
    android:layout_height="88dp"
    android:layout_gravity="center"
    android:layout_marginBottom="5dp"
    android:layout_marginTop="5dp"
    android:src="@drawable/campione" />

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

activity_menu.xml：

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

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

</GridView>

<TextView
    android:id="@+id/textView1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Menu del bar"
    android:textSize="25dp"
    android:textStyle="bold" />
</RelativeLayout>

对于“什么都不显示”我的意思是它只显示标题菜单del bar

Answer 1

此处更改为

@Override
public int getCount() {
return 0;
}

到

@Override
public int getCount() {
return gridViewString.length;
}

GridView不显示带有自定义适配器的项目

1 个答案: