[英]Bug - ListView -> item -> button OnClick : Change background color of parent
我嘗試更改listView項中按鈕的背景顏色,但是當我嘗試更改背景時,背景會更改每9個項目。 當我嘗試更改手機的方向時,背景每5個項目都會更改一次...
--- 了解圖片:
http://image.noelshack.com/fichiers/2014/09/1393436440-problem.png
我不明白,真是奇怪。
我創建了一個適配器。
Java.java (不是我的適配器文件)
public void clickPresent(View v)
{
v.setBackgroundColor(Color.BLUE);
}
public void drawStudentsInListView()
{
for (int i = 0; i < this.listStudents.size(); i++)
{
Log.e("STUDENT", this.listStudents.get(i)._firstName);
}
if (listStudents.size() > 0)
{
Student[] weather_data;
weather_data = new Student[listStudents.size()];
for (int i = 0; i < listStudents.size(); i++)
{
weather_data[i] = new Student(listStudents.get(i)._firstName, listStudents.get(i)._lastName);
Log.e("Count nbr student: ", "i = " + i);
}
WeatherAdapter adapter = new WeatherAdapter(this, R.layout.listview_item_row, weather_data);
listView1 = (ListView)findViewById(R.id.listView1);
listView1.setAdapter(adapter);
}
}
listview_item_row.xml
<Button
android:layout_width="100dp"
android:layout_height="30dp"
android:background="#009857"
android:layout_marginLeft="10dp"
android:textColor="#ffffff"
android:text="OK"
android:id="@+id/buttonPresent"
android:onClick="clickPresent" />
Adapter.java
public class WeatherAdapter extends ArrayAdapter<Student>
{
Context context;
int layoutResourceId;
Student data[] = null;
public WeatherAdapter(Context context, int layoutResourceId, Student[] data)
{
super(context, layoutResourceId, data);
this.layoutResourceId = layoutResourceId;
this.context = context;
this.data = data;
}
@Override
public View getView(int position, View convertView, ViewGroup parent)
{
View row = convertView;
WeatherHolder holder = null;
if (row == null)
{
LayoutInflater inflater = ((Activity)context).getLayoutInflater();
row = inflater.inflate(layoutResourceId, parent, false);
holder = new WeatherHolder();
holder.firstName = (TextView)row.findViewById(R.id.textFirstName);
holder.lastName = (TextView)row.findViewById(R.id.textLastName);
row.setTag(holder);
}
else
{
holder = (WeatherHolder)row.getTag();
}
Student weather = data[position];
holder.firstName.setText(weather._firstName);
holder.lastName.setText(weather._lastName);
return row;
}
static class WeatherHolder
{
TextView firstName;
TextView lastName;
}
}
我不明白問題是什么:/
謝謝,
為了提高性能,ListView使用舊的視圖在滾動時將新的視圖充氣,這就是為什么您在其他視圖中看到重復的動作的原因。
為了解決您的問題,我建議您為當前項目按鈕設置一個布爾變量作為Tag。
鑒於此,您的行項目包含(名字,姓氏),請添加一個新的屬性按鈕。
static class WeatherHolder
{
TextView firstName;
TextView lastName;
Button button
}
像在其他項目上一樣在GetView上初始化它,然后在獲取學生詳細信息時,檢查按鈕是否具有等於True的標記(=>表示已單擊),並且在clickPresent方法中,當您設置單擊,然后單擊False。
注意:如果標簽等於假,請重置顏色。
public void clickPresent(View v)
{
v.setBackgroundColor(Color.BLUE);
v.setTag(true);
}
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