2014-02-08 65 views
0

我有方法顯示對話框與列表視圖。這裏是我的代碼: 方法:NPE在setAdapter()

private void showWindow(){ 
Bitmap [] img = {dz, rz, s, ww}; 
Dialog builder = new Dialog(myContext); 
builder.setTitle("to jest list view"); 
CustomList adapter = new CustomList(myContext, 
    android.R.layout.simple_list_item_1, img); 
builder.setContentView(R.layout.wybierz_kolor); 
ListView listView1 = (ListView) findViewById(R.id.listView1); 
listView1.setAdapter(adapter); 
builder.show(); 
listView1.setOnItemClickListener(new OnItemClickListener(){ 
@Override 
public void onItemClick(AdapterView<?> parent, View view, int position, 
     long id) { 
    switch(position){ 
    case 0: 
     break; 
    case 1: 
     break; 
    case 2: 
     break; 
    case 3: 
     break; 
    } 
} 
});} 

但本着 「listView1.setAdapter(適配器);」我有NPE。我搜索,但沒有。也許我忘了一些東西,我不知道。感謝您的幫助

回答

0

因爲ListView是對話佈局內所以使用對話情境來初始化listView1setContentView爲:

ListView listView1 = (ListView)builder.findViewById(R.id.listView1); 
+0

@ user978758:[android.R.layout.simple_list_item_1](http://grepcode.com /file/repository.grepcode.com/java/ext/com.google.android/android/2.3.4_r1/frameworks/base/core/res/res/layout/simple_list_item_1.xml)佈局使用TextView而不是ImageView來顯示行在ListView中,所以如果你想使用任何其他視圖而不是TextView(就像你的情況ImageView),那麼你將需要通過擴展任何可用的適配器來創建一個自定義適配器 –

+0

我有自定義適配器:public class Custom List extends ArrayAdapter { \t private final Context context; \t private final Bitmap [] obrazki; \t公共CustomList(上下文語境,INT textViewResourceId, \t \t \t位圖[] obrazki){ \t \t超級(上下文,textViewResourceId); \t \t this.context = context; \t \t this.obrazki = obrazki; \t} – user978758

+0

和getView方法:@Override \t公共視圖getView(INT位置,查看convertView,父的ViewGroup){ \t \t LayoutInflater充氣= LayoutInflater.from(上下文); \t \t查看rowView = inflater.inflate(R.layout.wybierz_kolor_obrazek,null); \t \t ImageView iv =(ImageView)rowView.findViewById(R.id.imageView1); \t \t iv.setImageBitmap(obrazki [position]); \t \t return rowView; \t} – user978758