GridView不顯示帶自定義適配器的項目

Question

我使用GridView和自定義適配器（MenuAdapter）顯示一些文本和圖像，但是當我啓動活動時，它不顯示項目。

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> 

對於 「深藏不露」 我的意思是，它只是顯示標題菜單欄德爾

Answer 1

這裏的變化從

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

到

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