Question

我正在尝试制作列表视图，每行包含一个imageview和两个文本视图。显示图像和第二个textview，但第一个textview是空白的...无法弄清楚出了什么问题...我无法绕过自定义列表适配器...我已阅读http://commonsware.com/Android/excerpt.pdf到

我的数据正确加载到arraylist。我的代码：

private class SongAdapter extends ArrayAdapter<Szam> {

        private ArrayList<Szam> items;

        public SongAdapter(Context context, int textViewResourceId,     ArrayList<Szam> items) {
                super(context, textViewResourceId, items);
                this.items = items;
        }
        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
                View v = convertView;
                if (v == null) {
                    LayoutInflater vi = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                    v = vi.inflate(R.layout.row, null);
                }
                Szam o = items.get(position);
                if (o != null) {
                        TextView tt = (TextView) v.findViewById(R.id.firstLine);
                        TextView bt = (TextView) v.findViewById(R.id.secondLine);
                        if (tt != null) {
                              tt.setText(o.getArtist());                            }
                        if(bt != null){
                              bt.setText(o.getTitle());
                        }
                }
                return v;
        }

我的xml布局：

 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"     android:minHeight="?android:attr/listPreferredItemHeight"
android:layout_height="wrap_content" android:padding="6dip">

<TextView android:id="@+id/secondLine" android:layout_width="fill_parent"
    android:layout_height="26dip" android:layout_toRightOf="@+id/icon"
    android:layout_alignParentBottom="true"
    android:layout_alignParentRight="true" android:singleLine="true"
    android:ellipsize="marquee"
    android:text="Simple application that shows how to use RelativeLayout" />

<TextView android:id="@+id/firstLine" android:layout_width="fill_parent"
    android:layout_height="wrap_content" android:layout_toRightOf="@+id/icon"
    android:layout_alignParentRight="true" android:layout_alignParentTop="true"
    android:layout_above="@id/secondLine"
    android:layout_alignWithParentIfMissing="true" android:gravity="center_vertical"
    android:text="My Application" />
<ImageView android:layout_marginRight="6dip" android:id="@+id/icon"
    android:src="@drawable/play" android:layout_width="wrap_content"
    android:layout_height="fill_parent" android:layout_alignParentLeft="true"></ImageView>

 </RelativeLayout>

更正的布局是：

<TextView android:id="@+id/secondLine1" android:layout_width="fill_parent"
    android:layout_height="wrap_content"  android:layout_toRightOf="@+id/icon"
    android:layout_alignParentBottom="true"
    android:layout_alignParentRight="true" android:singleLine="true"
    android:ellipsize="marquee"
    android:textColor="#ffffff"

    android:textSize="12sp"
    android:text="Simple application that shows how to use RelativeLayout" />

<TextView android:id="@+id/firstLine1" android:layout_width="wrap_content"
    android:layout_height="wrap_content" android:layout_toRightOf="@+id/icon"
    android:layout_alignParentRight="true" android:layout_alignParentTop="true"
    android:ellipsize="marquee"
    android:textColor="#ffffff"

    android:textSize="16sp" 
    android:layout_alignWithParentIfMissing="true"
    android:text="My Application" />

<ImageView android:layout_marginRight="6dip" android:id="@+id/icon"
    android:src="@drawable/play" android:layout_width="wrap_content"
    android:layout_height="fill_parent" android:layout_alignParentLeft="true"></ImageView>

Answer 1

你不能使用LinearLayouts吗？

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent"
    android:minHeight="?android:attr/listPreferredItemHeight" android:layout_height="wrap_content" android:padding="6dip">
    <ImageView android:layout_marginRight="6dip" android:id="@+id/icon" android:src="@drawable/play" android:layout_width="wrap_content"
        android:layout_height="fill_parent"></ImageView>
    <LinearLayout android:id="@+id/linearLayout1" android:layout_width="wrap_content" android:orientation="vertical"
        android:layout_height="wrap_content">
        <TextView android:text="My Application" android:layout_height="wrap_content" android:gravity="center_vertical" android:id="@+id/firstLine"
            android:layout_width="fill_parent"></TextView>
        <TextView android:singleLine="true" android:text="Simple application that shows how to use RelativeLayout" android:layout_height="wrap_content"
            android:ellipsize="marquee" android:id="@+id/secondLine" android:layout_width="fill_parent"></TextView>
    </LinearLayout>
</LinearLayout>

ListView不显示第一个textview项

1 个答案: