我有网格视图，每个项目包含少量图像和文本。当它第一次加载时，一切都很好，但如果我滚动到底部并返回顶部，一些项目中的两个图像就会消失，并且它会随机出现。
这是Grid视图的代码
<GridView
android:id="@+id/testR_grid"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
android:clickable="true"
android:columnWidth="@dimen/gridview_column_width"
android:horizontalSpacing="@dimen/grid_horizontal_spacing"
android:listSelector="@drawable/gridview_background"
android:numColumns="auto_fit"
android:scrollbarStyle="outsideOverlay"
android:scrollbars="vertical"
android:verticalScrollbarPosition="right"
android:verticalSpacing="@dimen/grid_vertical_spacing"
android:fastScrollEnabled="false"/>
这里是单项
的代码<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="250dp"
android:layout_marginTop="5dp"
android:descendantFocusability="blocksDescendants"
android:orientation="vertical">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@drawable/blurry_shadow_rect">
<com.joooonho.SelectableRoundedImageView xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/item_image"
android:layout_width="match_parent"
android:layout_height="@dimen/gridview_column_width"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="5dp"
android:layout_marginTop="-5dp"
app:sriv_left_bottom_corner_radius="0dip"
app:sriv_left_top_corner_radius="4dip"
app:sriv_right_bottom_corner_radius="0dip"
app:sriv_right_top_corner_radius="4dip" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/item_image"
android:layout_marginBottom="5dp"
android:layout_marginLeft="2dp"
android:orientation="horizontal"
android:weightSum="100">
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="35">
<TextView
android:id="@+id/item_text"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_gravity="start"
android:layout_marginBottom="5dp"
android:ellipsize="end"
android:fontFamily="sans-serif-light"
android:maxLines="1"
android:text=""
android:textColor="@color/bodyText"
android:textSize="@dimen/GridHeader" />
<TextView
android:id="@+id/item_TestA_name"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/item_text"
android:layout_marginBottom="10dp"
android:alpha=".5"
android:ellipsize="end"
android:maxLines="1"
android:text=""
android:textColor="@color/bodyText"
android:textSize="@dimen/GridHeader2" />
</RelativeLayout>
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="2dp"
android:layout_weight="65">
<TextView
android:id="@+id/item_testR_free_text"
style="@style/textview_grid_free_banner"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:fontFamily="sans-serif-light"
android:maxLines="1"
android:padding="2dp"
android:singleLine="true"
android:text=" FREE " />
<ImageView
android:layout_width="20dp"
android:layout_height="20dp"
android:id="@+id/already_owned"
android:layout_centerVertical="true"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:singleLine="true"
android:layout_marginLeft="20dp"
android:layout_marginBottom="5dp"
android:visibility="gone"
android:layout_marginEnd="10dp"
android:layout_marginRight="10dp"
android:src="@drawable/ic_testR_bought_36dp" />
<ImageButton
android:id="@+id/item_testR_more_options"
android:layout_width="@dimen/image_button_more"
android:layout_height="@dimen/image_button_more"
android:layout_alignParentEnd="true"
android:layout_alignParentRight="true"
android:layout_below="@+id/item_testR_free_text"
android:alpha=".5"
android:background="@drawable/imagebutton_background"
android:clickable="true"
android:focusable="false"
android:src="@drawable/ic_more_vert_black_24dp" />
</RelativeLayout>
</LinearLayout>
</RelativeLayout>
</RelativeLayout>
元素随机丢失的是ID为item_testR_free_text的文本视图和ID为is already_owned的imageview。还有一点需要注意，这两个项目的可见性是有条件的。
这是我的适配器代码
public class TestRGridViewAdapter extends ArrayAdapter<TestR> {
Context context;
int layoutResourceId;
List<TestR> data = new ArrayList<TestR>();
RecordHolder holder = null;
//DiskCache imgCache;
TestA TestA;
TestR item;
FragmentActivity mFragmentActivity;
boolean is_local = false;
List<Track> trackList;
public TestR getItem() {
return item;
}
public void setItem(TestR item) {
this.item = item;
}
public TestRGridViewAdapter(Context context, int layoutResourceId,
List<TestR> data, FragmentActivity mFragmentActivity, boolean is_local) {
super(context, layoutResourceId, data);
this.layoutResourceId = layoutResourceId;
this.context = context;
this.data = data;
this.mFragmentActivity = mFragmentActivity;
// imgCache = Parameters.imgCache;
this.is_local = is_local;
}
public TestRGridViewAdapter(Context context, int layoutResourceId,
List<TestR> data, FragmentActivity mFragmentActivity) {
super(context, layoutResourceId, data);
this.layoutResourceId = layoutResourceId;
this.context = context;
this.data = data;
this.mFragmentActivity = mFragmentActivity;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View row = convertView;
if (row == null) {
//LayoutInflater inflater = ((Activity) context).getLayoutInflater();
row = LayoutInflater.from(context).inflate(layoutResourceId, null);
//row = inflater.inflate(layoutResourceId, parent, false);
holder = new RecordHolder();
holder.item_testR_free_text = (TextView) row.findViewById(R.id.item_testR_free_text);
holder.txtTitle = (TextView) row.findViewById(R.id.item_text);
holder.txtTestAName = (TextView) row.findViewById(R.id.item_TestA_name);
holder.imageItem = (SelectableRoundedImageView) row.findViewById(R.id.item_image);
holder.item_testR_more_options = (ImageButton) row.findViewById(R.id.item_testR_more_options);
holder.already_owned = (ImageView) row.findViewById(R.id.already_owned);
// holder.grid_swipe_refresh_layout = (SwipeRefreshLayout) row.findViewById(R.id.grid_swipe_refresh_layout);
row.setTag(holder);
} else {
holder = (RecordHolder) row.getTag();
}
item = data.get(position);
holder.txtTitle.setText(item.getName());
// else
// holder.txtArtitName.setText("");
//holder.imageItem.setImageBitmap(item.getImage());
try {
if (item.getTestA_id() == null)
item = new SaveData(context).get_online_testR(item.getTestR_id());
TestA = Helper.getDaoSession(context).getTestADao().load(item.getTestA_id());
if (TestA == null) {
TestA = new SaveData(context).get_save_TestA(item.getTestA_id());
}
// if (TestA != null)
holder.txtTestAName.setText((TestA != null) ? TestA.getName() : "");
// else
// TestA = new SaveData(context).get_save_TestA(item.getTestA_id());
if (!is_local) {
if(!DBQuery.is_owner(context,item.getTestR_id())) {
Log.d("test","not owner - "+item.getName());
holder.item_testR_free_text.setText(
UXHelper.getPriceFromString(Parameters.price_type.equals("local_price") ?
item.getLocal_price().toString() : item.getPrice().toString()));
holder.already_owned.setVisibility(View.INVISIBLE);
holder.item_testR_more_options.setOnClickListener(new testR_popup_onClick(context, item, holder.item_testR_more_options, mFragmentActivity, TestA));
}else {
Log.d("test","owner - "+item.getName());
holder.item_testR_free_text.setVisibility(View.INVISIBLE);
holder.already_owned.setVisibility(View.VISIBLE);
holder.item_testR_more_options.setOnClickListener(new testR_popup_onClick(context, item, holder.item_testR_more_options, mFragmentActivity, TestA));
}
} else {
Log.d("test","local - "+item.getName());
holder.already_owned.setVisibility(View.INVISIBLE);
boolean synced = true;
trackList = new ArrayList<Track>();
List<Track> trackListTmp = new SaveData(context).get_tracks_local(item.getTestR_id());
boolean testR_owner = DBQuery.is_owner(context, trackListTmp.get(0).getTestR_id());
for (Track t : trackListTmp) {
boolean track_owner = DBQuery.is_owner(context, t.getTrack_id(), t.getTestR_id());
if (track_owner)
trackList.add(t);
if (testR_owner || track_owner) {
if (t.getSynced_dir() == null) {
synced = false;
// break;
} else if (!new File(t.getSynced_dir()).exists()) {
synced = false;
// break;
}
}
}
if (synced) {
Log.d("test","synched - "+item.getName());
holder.item_testR_free_text.setVisibility(View.VISIBLE);
holder.item_testR_free_text.setText("Synced");
} else {
Log.d("test","not synched - "+item.getName());
holder.item_testR_free_text.setVisibility(View.INVISIBLE);
holder.item_testR_more_options.setOnClickListener(
new testR_popup_downloaded_onCLick(context, item, holder.item_testR_more_options, mFragmentActivity, TestA,
trackList.toArray(new Track[trackList.size()]), synced));
}
}
Target target = new Target() {
@Override
public void onBitmapLoaded(Bitmap bitmap, Picasso.LoadedFrom from) {
holder.imageItem.setImageBitmap(bitmap);
}
@Override
public void onBitmapFailed(Drawable errorDrawable) {
holder.imageItem.setImageResource(R.drawable.ic_example_36);
}
@Override
public void onPrepareLoad(Drawable placeHolderDrawable) {
holder.imageItem.setImageResource(R.drawable.ic_example_36);
}
};
if (Parameters.mPicasso == null)
Parameters.mPicasso = new Picasso.Builder(context)
.build();
Parameters.mPicasso.load("http://" + context.getString(R.string.ip) + "/" +
context.getString(R.string.TestRsController) + "/" + context.getString(R.string.TESTR_THUMB_URL)
+ "/" + item.getTestR_id()+"/"+Parameters.dpi)
.placeholder(R.drawable.ic_example_36)
.error(R.drawable.ic_example_36)
.into(holder.imageItem);
} catch (Exception ex) {
new Logger(context).appendLog("Error in TestR grid view item " + ex.getMessage());
}
return row;
}
static class RecordHolder {
// SwipeRefreshLayout grid_swipe_refresh_layout;
TextView txtTitle;
TextView txtTestAName;
SelectableRoundedImageView imageItem;
TextView item_testR_free_text;
ImageButton item_testR_more_options;
ImageView already_owned;
}
}