我扩展了一个 ArrayAdapter
覆盖了 getView()
填写我的方法 ListView
对象,但适配器将从 ArrayList
中获取前两个或三个对象我传递给它,然后在列表的整个长度上以看似随机的顺序重复那些。此外,当我在 ListView
中上下滚动时,一些行从一个列表项更改为另一个。 ArrayList<Credit>
对象从 JSONObject 填充,据我所知在传递到 ArrayAdapter
之前是正确的.
我的习惯ArrayAdapter
private class CreditArrayAdapter extends ArrayAdapter<Credit> {
private ArrayList<Credit> credits;
private int creditCount;
public CreditArrayAdapter(Context ctx, int textViewResourceId, List<Credit> items) {
super(ctx, textViewResourceId, items);
credits = (ArrayList<Credit>) items;
creditCount = credits.size();
}
@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.list_item_movie_medium, null);
Credit current = credits.get(position);
Log.d(tag, "current credit: " + current.toString());
ImageView creditPicture = (ImageView) v.findViewById(R.id.image_poster_thumbnail);
try {
creditPicture.setImageBitmap(current.getPosterSmall());
} catch(Exception e) {
Log.d(tag, "failed to set cast member picture");
e.printStackTrace();
}
TextView castMemberName = (TextView) v.findViewById(R.id.text_credit_info);
castMemberName.setText(current.toString());
}
return v;
}
@Override
public int getCount() {
return creditCount;
}
}
被调用者:
appearsIn = (ListView) findViewById(R.id.listview_appears_in);
List<Credit> credits = searcher.getCreditsByPersonId(personId);
CreditArrayAdapter creditAdapter = new CreditArrayAdapter(getBaseContext(), R.layout.list_item_movie_medium, credits);
creditAdapter.notifyDataSetChanged();
appearsIn.setAdapter(creditAdapter);
包含 ListView
的布局:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_centerHorizontal="true"
android:weightSum="2">
<ScrollView android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1">
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<ImageView android:id="@+id/image_person_info"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:contentDescription="person image"/>
<TextView android:id="@+id/text_person_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="30dp"/>
<TextView android:id="@+id/text_person_birth"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="20dp"/>
<TextView android:id="@+id/text_person_death"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="20dp"/>
<TextView android:id="@+id/text_person_bio"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="16dp"/>
</LinearLayout>
</ScrollView>
<ListView android:id="@+id/listview_appears_in"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1"/>
</LinearLayout>
我的列表项布局:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="horizontal">
<ImageView android:id="@+id/image_poster_thumbnail"
android:layout_height="wrap_content"
android:layout_width="wrap_content"/>
<TextView android:id="@+id/text_credit_info"
android:layout_height="wrap_content"
android:layout_width="fill_parent"/>
</LinearLayout>
最佳答案
像这样更改 getView:
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.list_item_movie_medium, null);
}
Credit current = credits.get(position);
Log.d(tag, "current credit: " + current.toString());
ImageView creditPicture = (ImageView) v.findViewById(R.id.image_poster_thumbnail);
try {
creditPicture.setImageBitmap(current.getPosterSmall());
} catch(Exception e) {
Log.d(tag, "failed to set cast member picture");
e.printStackTrace();
}
TextView castMemberName = (TextView) v.findViewById(R.id.text_credit_info);
castMemberName.setText(current.toString());
return v;
}
您的问题是当 convertView 为 != null 时,您没有执行正确设置 View 对象所需的所有代码。
关于android - ArrayAdapter 的 getView() 方法重复列表中的前两个或三个项目,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/11415618/