我有一个问题，我通过代码在 LinearLayout 中动态添加 listview 并将 EndlessAdapter 设置到其中，数据显示正确，但我们无法在列表中从上到下滚动。我不知道为什么？请向我建议任何有关相同的解决方案。
代码：
public void setValuesInCategoryChild(String url, final String filter, final String from, final String to) {
if (isOnline()) {
final ProgressDialog dialog = ProgressDialog.show(ResearchList.this, "Research List ", "Please wait... ", true);
final Handler handler = new Handler() {
public void handleMessage(Message msg) {
// System.out.println("The id after Save:"+id.get(0).toString());
// catagory.addAll(keyword_vector1);
linear_Category_Child.setVisibility(View.GONE);
linear_Category_Child_Child.setVisibility(View.VISIBLE);
// tv_Child_Header.setText("Volvo");
tv_CategoryChildHeader.setText(from);
setHeaderImage(tv_CategoryChildHeader.getText().toString());
System.out.println("The size of Cat Display names:" + coll.getDisplayNames().size());
System.out.println("The size of Cat Images:" + coll.getImages().size());
System.out.println("The size of Cat price:" + coll.getPrice().size());
System.out.println("The size of Cat Year:" + coll.getYears().size());
System.out.println("The size of Cat Rating:" + coll.getRating().size());
System.out.println("The size of Cat Mpg:" + coll.getMpg().size());
setHeaderImage(tv_CategoryChildHeader.getText().toString());
if(coll.getDisplayNames().size()!=0) {
lvCategory = new ListView(ResearchList.this);
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT);
lvCategory.setLayoutParams(params);
// Adapter for MPG Search
demoAdapterCat = new DemoAdapterCat();
lvCategory.setAdapter(demoAdapterCat);
layout_ResearchList_BrandList.addView(lvCategory);
Utility.setListViewHeightBasedOnChildren(lvCategory);
}else {
/*lvCategory.invalidate();
lvCategory.setAdapter(null);*/
AlertDialog.Builder builder = new Builder(ResearchList.this);
builder.setTitle("Attention!");
builder.setMessage("No Data Available for the Particular Search.");
builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
}
});
builder.create().show();
}
/*Utility util = new Utility();
util.setListViewHeightBasedOnChildren(lvCategory);*/
dialog.dismiss();
}
};
final Thread checkUpdate = new Thread() {
public void run() {
try {
String sortEncode = URLEncoder.encode("mpg");
String filterEncode = URLEncoder.encode(filter);
String clientEncode = URLEncoder.encode("10030812");
String fromEncode = URLEncoder.encode(from);
String toEncode = URLEncoder.encode(to);
String catUrl = "/v1/vehicles/get-make-models.json?sort=" + sortEncode + "&filter=" + filterEncode + "&client-id=" + clientEncode + "&from=" + fromEncode;
genSig = new GetSignature(catUrl, "acura");
try {
signature = genSig.getUrlFromString();
} catch (InvalidKeyException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (NoSuchAlgorithmException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
// jsonString =
// getJsonSring("http://api.highgearmedia.com/v1/vehicles/get-models.json?make=acura&client-id=10030812&signature=LWQbdAlJVxlXZ1VO2mfqAA==");
// String signatureEncode =
// URLEncoder.encode(signature);
String urlEncode = URLEncoder.encode(catUrl + "&signature=" + signature);
jsonString = getJsonSring("http://apibeta.highgearmedia.com" + catUrl + "&signature=" + signature);
System.out.println("The json category:===>" + jsonString);
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (URISyntaxException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
JsonParse json = new JsonParse(jsonString);
json.parseCat();
LIST_SIZE = coll.getDisplayNames().size();
for (int i = 0; i <= BATCH_SIZE; i++) {
// countriesSub.add(COUNTRIES[i]);
countriesSubCat.add(coll.getDisplayNames().get(i));
imagesSubCat.add(coll.getImages().get(i));
YearSubCat1.add(coll.getYears().get(i));
YearSubCat2.add(coll.getYears().get(i + 1));
mpgSubCat1.add(coll.getMpg().get(i));
mpgSubCat2.add(coll.getMpg().get(i + 1));
priceSubCat1.add(coll.getPrice().get(i));
priceSubCat2.add(coll.getPrice().get(i + 1));
ratingSubCat1.add(coll.getRating().get(i));
ratingSubCat2.add(coll.getRating().get(i + 1));
}
setLastOffset(BATCH_SIZE);
handler.sendEmptyMessage(0);
}
};
checkUpdate.start();
} else {
AlertDialog.Builder builder = new Builder(ResearchList.this);
builder.setTitle("Attention!");
builder.setMessage("Network Connection unavailable.");
builder.setPositiveButton("OK",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
}
});
builder.create().show();
}
}
布局：
<LinearLayout
android:id="@+id/linear_ResearchListCategoryChild_Child"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:visibility="gone" >
<RelativeLayout
android:id="@+id/linear_ResearchListCategoryChild_Child_HeaderBlock"
android:layout_width="fill_parent"
android:layout_height="40dip"
android:background="@drawable/catagory_bar"
android:orientation="horizontal" >
<TextView
android:id="@+id/tv_ResearchListCategoryChild_Child_Header"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:text="Work in Progress"
android:textColor="#ffffff"
android:textStyle="bold" android:layout_marginLeft="60dip"/>
<ImageView
android:id="@+id/img_ResearchListCategory_ChildHeader"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true"
android:layout_marginLeft="10dip"
android:src="@drawable/up_arrow" />
<ImageView
android:id="@+id/imageView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:layout_marginRight="10dp"
android:src="@drawable/list_arrow_up" />
</RelativeLayout>
<RelativeLayout
android:id="@+id/linear_ResearchListCategoryChild_Child_Header"
android:layout_width="fill_parent"
android:layout_height="40dip"
android:background="@drawable/nav_bg"
android:orientation="horizontal" >
<TextView
android:id="@+id/textView5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true"
android:layout_marginLeft="5dip"
android:clickable="true"
android:text="Highest Rated"
android:textColor="#ffffff"
android:textStyle="bold" android:gravity="center"/>
<TextView
android:id="@+id/textView6"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/textView5"
android:layout_alignBottom="@+id/textView5"
android:layout_marginLeft="30dp"
android:layout_toRightOf="@+id/textView5"
android:clickable="true"
android:text="A-Z"
android:textColor="#ffffff"
android:textStyle="bold" android:gravity="center"/>
<TextView
android:id="@+id/textView7"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/textView6"
android:layout_alignBottom="@+id/textView6"
android:layout_marginLeft="40dp"
android:layout_toRightOf="@+id/textView6"
android:clickable="true"
android:text="Price"
android:textColor="#ffffff"
android:textStyle="bold" android:gravity="center"/>
<TextView
android:id="@+id/textView8"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/textView7"
android:layout_alignBottom="@+id/textView7"
android:layout_alignParentRight="true"
android:layout_marginRight="14dp"
android:clickable="true"
android:text="MPG"
android:textColor="#ffffff"
android:textStyle="bold" android:gravity="center"/>
</RelativeLayout>
<!--
<RelativeLayout
android:id="@+id/relative_down_arrow"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:visibility="visible"
>
</RelativeLayout>
-->
<LinearLayout
android:id="@+id/linearArrowLayout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:visibility="visible">
<ImageView
android:id="@+id/Highly_rated"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="51dp"
android:src="@drawable/selector_arrow"
android:visibility="invisible" />
<ImageView
android:id="@+id/AZ_arrow"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="78dp"
android:src="@drawable/selector_arrow"
android:visibility="invisible" />
<ImageView
android:id="@+id/Price_arrow"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="59dp"
android:src="@drawable/selector_arrow"
android:visibility="invisible" />
<ImageView
android:id="@+id/MPG"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="55dp"
android:src="@drawable/selector_arrow"
android:visibility="invisible" />
</LinearLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="12dip"
android:layout_marginRight="12dip" android:background="#ffffff" android:id="@+id/layout_ResearchList_BrandList">
</LinearLayout>
</LinearLayout>
演示适配器猫：
class DemoAdapterCat extends EndlessAdapter {
ImageLoader image = new ImageLoader(ResearchList.this);
private RotateAnimation rotate = null;
ArrayList<String> tempListNamesCat = new ArrayList<String>();
ArrayList<String> tempListImagesCat = new ArrayList<String>();
ArrayList<String> tempListYearCat1 = new ArrayList<String>();
ArrayList<String> tempListYearCat2 = new ArrayList<String>();
ArrayList<String> tempListmpgCat1 = new ArrayList<String>();
ArrayList<String> tempListmpgCat2 = new ArrayList<String>();
ArrayList<String> tempListpriceCat1 = new ArrayList<String>();
ArrayList<String> tempListpriceCat2 = new ArrayList<String>();
ArrayList<String> tempListRatingCat1 = new ArrayList<String>();
ArrayList<String> tempListRatingCat2 = new ArrayList<String>();
DemoAdapterCat() {
super(new CategoryListLazyAdapter(ResearchList.this,
countriesSubCat, imagesSubCat, YearSubCat1, YearSubCat2,
mpgSubCat1, mpgSubCat2, priceSubCat1, priceSubCat2,
ratingSubCat1, ratingSubCat2));
/*Utility util = new Utility();
util.setListViewHeightBasedOnChildren(lvCategory);*/
rotate = new RotateAnimation(0f, 360f, Animation.RELATIVE_TO_SELF,
0.5f, Animation.RELATIVE_TO_SELF, 0.5f);
rotate.setDuration(600);
rotate.setRepeatMode(Animation.RESTART);
rotate.setRepeatCount(Animation.INFINITE);
}
/*
* @Override public int getCount() { return
* brandList.getDisplayNames().size(); //return count+=10; }
*/
@Override
protected View getPendingView(ViewGroup parent) {
row = getLayoutInflater().inflate(R.layout.categorylist, null);
child = row.findViewById(R.id.tv_CategoryItem_Name);
child.setVisibility(View.GONE);
child = row.findViewById(R.id.tv_CategoryItem_MPG1);
child.setVisibility(View.GONE);
child = row.findViewById(R.id.tv_CategoryItem_MPG2);
child.setVisibility(View.GONE);
child = row.findViewById(R.id.tv_CategoryItem_Price1);
child.setVisibility(View.GONE);
child = row.findViewById(R.id.tv_CategoryItem_Price2);
child.setVisibility(View.GONE);
child = row.findViewById(R.id.tv_CategoryItem_Rating1);
child.setVisibility(View.GONE);
child = row.findViewById(R.id.tv_CategoryItem_Rating2);
child.setVisibility(View.GONE);
child = row.findViewById(R.id.tv_CategoryItem_Year1);
child.setVisibility(View.GONE);
child = row.findViewById(R.id.tv_CategoryItem_Year2);
child.setVisibility(View.GONE);
child = row.findViewById(R.id.linear_CategoryList_itemlayer1);
child.setVisibility(View.GONE);
child = row.findViewById(R.id.linear_CategoryList_itemlayer2);
child.setVisibility(View.GONE);
/*
* child = row.findViewById(R.id.img_CategoryItem);
* child.setVisibility(View.GONE); child =
* row.findViewById(R.id.img_CategoryItem_Arrow);
* child.setVisibility(View.GONE);
*/
/*
* child = row.findViewById(R.id.linear_main_MPG);
* child.setVisibility(View.GONE);
*/
child = row.findViewById(R.id.throbber);
child.setVisibility(View.VISIBLE);
child.startAnimation(rotate);
return (row);
}
@Override
protected boolean cacheInBackground() {
//count += 10;
SystemClock.sleep(100000);
tempListNamesCat.clear();
tempListImagesCat.clear();
tempListmpgCat1.clear();
tempListmpgCat2.clear();
tempListpriceCat1.clear();
tempListpriceCat2.clear();
tempListYearCat1.clear();
tempListYearCat2.clear();
tempListRatingCat1.clear();
tempListRatingCat2.clear();
// countriesSubCat.clear();
// imagesSubCat.clear();
// YearSubCat1.clear();
// YearSubCat2.clear();
// mpgSubCat1.clear();
// mpgSubCat2.clear();
// priceSubCat1.clear();
// priceSubCat2.clear();
// ratingSubCat1.clear();
// ratingSubCat2.clear();
int lastOffset = getLastOffset();
if (lastOffset < LIST_SIZE) {
int limit = lastOffset + BATCH_SIZE;
for (int i = (lastOffset + 1); (i <= limit && i < LIST_SIZE); i++) {
tempListNamesCat.add(coll.getDisplayNames().get(i));
tempListImagesCat.add(coll.getImages().get(i));
tempListmpgCat1.add(coll.getMpg().get(i));
tempListmpgCat2.add(coll.getMpg().get(i + 1));
tempListpriceCat1.add(coll.getPrice().get(i));
tempListpriceCat2.add(coll.getPrice().get(i + 1));
tempListRatingCat1.add(coll.getRating().get(i));
tempListRatingCat2.add(coll.getRating().get(i + 1));
tempListYearCat1.add(coll.getYears().get(i));
tempListYearCat2.add(coll.getYears().get(i + 1));
}
setLastOffset(limit);
if (limit < LIST_SIZE) {
// return true;
return (getWrappedAdapter().getCount() < coll
.getDisplayNames().size());
} else {
return false;
}
} else {
return false;
}
}
@Override
protected void appendCachedData() {
@SuppressWarnings("unchecked")
// Activity activity = this;
// ArrayAdapter<String> arrAdapterNew =
// (ArrayAdapter<String>)getWrappedAdapter();
CategoryListLazyAdapter arrAdapterNewCategory = (CategoryListLazyAdapter) getWrappedAdapter();
// int listLen = tempList.size();
// int listLen = tempListNames.size();
countriesSubCat.addAll(tempListNamesCat);
imagesSubCat.addAll(tempListImagesCat);
mpgSubCat1.addAll(tempListmpgCat1);
mpgSubCat2.addAll(tempListmpgCat2);
priceSubCat1.addAll(tempListpriceCat1);
priceSubCat2.addAll(tempListpriceCat2);
ratingSubCat1.addAll(tempListRatingCat1);
ratingSubCat2.addAll(tempListRatingCat2);
YearSubCat1.addAll(tempListYearCat1);
YearSubCat2.addAll(tempListYearCat2);
arrAdapterNewCategory.notifyDataSetChanged();
/*Utility util = new Utility();
util.setListViewHeightBasedOnChildren(lvCategory);*/
/*
* for(int i=0; i<listLen; i++){ //
* arrAdapterNew.add(tempList.get(i)); }
*/
}
}
提前致谢。