我与标准自定义列表视图略有不同。我正在进行一项活动，负责显示从Parse.com数据库中检索的数据。数据内容大多采用html格式，可能包含任意数量的文本和图像。
我已经做过的事情：
我想要实现的目标：
我已经浏览了很多论坛，但我仍然无法找到一个解决方案，使用它可以在没有xml布局的情况下扩展listview，而是可以分配我的动态布局。
活动源代码：
public class MainActivity extends ActionBarActivity {
ArrayList<String> originalContentList = new ArrayList<String>();
ArrayList<String> reversedList = new ArrayList<String>();
ImageView imageView1;
Bitmap bitmap;
RelativeLayout parent_layout;
ParseObject user;
@Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
parent_layout = (RelativeLayout) findViewById(R.id.parent_layout);
login("xxx@xxx.com", "xxx");
// reverseArraylist();
}
private void loopThroughArrayAndAttach(){
LinearLayout llInner = new LinearLayout(this);
llInner.setOrientation(LinearLayout.VERTICAL);
LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);
parent_layout.addView(llInner);
for (int i = 0; i < originalContentList.size(); i++) {
if (hasNoImagess(originalContentList.get(i)) == true) {
// No images.
TextView myText = geneterTextView(originalContentList.get(i));
llInner.addView(myText);
} else {
ImageView myImage = geneterImageView(originalContentList.get(i));
llInner.addView(myImage);
}
}
}
public static boolean hasNoImagess(String contents){
Document doc = Jsoup.parse(contents);
Element element = doc.body();
Elements elements = element.select("img");
if (elements.isEmpty()) {
return true;
} else {
return false;
}
}
public ImageView geneterImageView(String imgContent){
// Will need to run via background thread - like aysnc
// Extract the image file via jsoup
// Insert it into a imagevieww
// Inser that into a layout.
Log.d("IN IMAGE ", " " + imgContent);
Document doc = Jsoup.parse(imgContent);
Elements img = doc.getElementsByTag("img");
Bitmap returnedBitmap = null;
ImageView iv = new ImageView(this);
for (Element el : img) {
String src = el.absUrl("src");
System.out.println("src attribute is : " + src);
// new DownloadImageTask((ImageView)
// findViewById(R.id.imageView1)).execute(src);
try {
//returnedBitmap = new LoadImage().execute(src).get();
WorkerThread mWorkerThread = new WorkerThread(iv);
mWorkerThread.execute(src);
// imageView1.setImageBitmap(returnedBitmap);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
// ImageView iv = new ImageView(this);
iv.setImageBitmap(returnedBitmap);
return iv;
}
public TextView geneterTextView(String textContent){
// Will need to run via background thread.
Log.i("In TEXT ", " " + textContent);
TextView tv = new TextView(this);
tv.setText(Html.fromHtml(textContent));
return tv;
}
private class WorkerThread extends AsyncTask<String, String, Bitmap> {
private WeakReference<ImageView> imageViewReference;
public WorkerThread(ImageView imageView) {
super();
imageViewReference = new WeakReference<ImageView>(imageView);
}
@Override
protected Bitmap doInBackground(String... args) {
// bitmap = null;
try {
bitmap = BitmapFactory.decodeStream((InputStream) new URL(args[0]).getContent());
} catch (Exception e) {
e.printStackTrace();
}
return bitmap;
}
@Override
protected void onPostExecute(Bitmap result) {
super.onPostExecute(result);
if (result != null && imageViewReference.get() != null) {
imageViewReference.get().setImageBitmap(result);
}
}
}
// to login to parse
private void login(final String username, String password){
ParseUser.logInInBackground(username, password, new LogInCallback() {
@Override
public void done(ParseUser user, ParseException e){
if (e == null) {
// if login sucess
// Start intent
// loginSuccess();
Toast.makeText(MainActivity.this, "Success", Toast.LENGTH_SHORT).show();
CloudCallStudentPosts(user);
} else {
Toast.makeText(MainActivity.this, "Failure", Toast.LENGTH_SHORT).show();
}
}
});
}
// //to get data from parse
public void CloudCallStudentPosts(ParseObject s){
setRichStory(s);
}
private void setRichStory(ParseObject s){
// Simialr to setStory, once implemented delete setStory()
new AddStoryAsync(s).execute();
}
class AddStoryAsync extends AsyncTask<Void, Object, Void> {
private static final String TAG = "LazyListView";
ParseObject s;
public AddStoryAsync(ParseObject s) {
this.s = s;
Log.w("In richStory", "ParseObject Id: " + s.getObjectId());
}
@Override
protected void onPreExecute(){
}
@Override
protected Void doInBackground(Void... unused){
HashMap<String, Object> params = new HashMap<String, Object>();
params.put("userid", this.s.getObjectId());
params.put("skip", 0);
ParseCloud.callFunctionInBackground("studentsPosts", params, new FunctionCallback<List<List<ParseObject>>>() {
@Override
public void done(List<List<ParseObject>> postList, com.parse.ParseException arg1){
if (postList == null) {
} else {
if (postList.size() > 0) {
// CustomWebView cwb;
for (int i = 0; i < postList.size(); i++) {
// final Post post = new Post();
if (postList.get(i).get(0).get("htmlContent") == null) {
if (postList.get(i).get(0).getNumber("type") != null) {
// post.setType(postList.get(i).get(0).getNumber("type"));
}
if (postList.get(i).get(0).getString("question") != null) {
// post.setQuestion(postList.get(i).get(0).getString("question"));
}
if (postList.get(i).get(0).getString("textContent") != null) {
// post.setQuestion(postList.get(i).get(0).getString("textContent"));
}
if (postList.get(i).get(0).getString("answer") != null) {
// post.setAnswer(postList.get(i).get(0).getString("answer"));
}
if (postList.get(i).get(0).getCreatedAt() != null) {
// post.setCreatedAt(postList.get(i).get(0).getCreatedAt());
}
// Need to re-get map and trip and photo
// types
if (postList.get(i).get(0).getParseFile("photo") != null)
postList.get(i).get(0).getParseFile("photo").getDataInBackground(new GetDataCallback() {
@Override
public void done(byte[] imageByte, ParseException arg1){
if (arg1 == null) {
Bitmap bmp = BitmapFactory.decodeByteArray(imageByte, 0, imageByte.length);
if (bmp == null) {
}
}
}
});
if (postList.get(i).get(0).getJSONArray("tripPoints") != null) {
// post.setTripPoints(postList.get(i).get(0).getJSONArray("tripPoints"));
}
if (postList.get(i).get(0).getParseGeoPoint("location") != null) {
// post.setLocation(postList.get(i).get(0).getParseGeoPoint("location"));
}
// publishProgress(post);
}
if (postList.get(i).get(0).get("htmlContent") != null) {
Log.e("htmlContent parse", postList.get(i).get(0).get("htmlContent").toString());
// Parse HTML String using JSoup library
String HTMLSTring = postList.get(i).get(0).get("htmlContent").toString();
Document html = Jsoup.parse(HTMLSTring);
Elements paragraphs = html.getElementsByTag("p");
for (org.jsoup.nodes.Element paragraph : paragraphs) {
String paragraphText = paragraph.toString();
Log.e("paragraphText", paragraphText);
originalContentList.add(paragraphText);
}
loopThroughArrayAndAttach();
}
// publishProgress(post);
// This is where we publish
}
}
}
}
});
return (null);
}
@Override
protected void onProgressUpdate(Object... object){
Log.w("onProgressUpdate ", " " + object[0].getClass());
Log.w("adding to arrayPostList ", " " + object[0].getClass());
}
@Override
protected void onPostExecute(Void unused){
}
}
}
方法loopThroughArrayAndAttach()以编程方式生成linearlayout并动态添加图像视图和文本视图。现在，linearlayout附加到父布局，需要用列表视图替换。
布局：
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/scrollView1"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/parent_layout">
</RelativeLayout>
</ScrollView>
如何实现所需的输出？