我是android新手。当我点击listview项目时，没有任何反应。我检查了我的代码3次，但无法解决问题所在。我想在单击某个项目时，用户名将显示在下一个活动的文本视图中。我不知道这是什么问题。
这是我的listview项目代码
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="1dp">
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/scrollView">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="10dp"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:background="#ffffff">
<ImageView
android:layout_width="380dp"
android:layout_height="200dp"
android:id="@+id/row_postPic"
android:background="#dcdcdc"
android:minHeight="50dp"
android:scaleType="centerCrop"
android:src="@drawable/url"
android:layout_below="@+id/row_date"
android:layout_centerHorizontal="true"
android:layout_marginTop="15dp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="name"
android:id="@+id/row_name"
android:textSize="18dp"
android:layout_alignTop="@+id/row_userid"
android:layout_alignRight="@+id/row_date"
android:layout_alignEnd="@+id/row_date"
android:layout_alignLeft="@+id/row_userid"
android:layout_alignStart="@+id/row_userid" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall"
android:text="date"
android:id="@+id/row_date"
android:textSize="16dp"
android:layout_alignBottom="@+id/imageToDownload2"
android:layout_alignRight="@+id/row_tittle"
android:layout_alignEnd="@+id/row_tittle"
android:layout_marginTop="60dp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="tittle"
android:id="@+id/row_tittle"
android:layout_below="@+id/row_postPic"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:layout_marginLeft="20dp"
android:layout_marginTop="10dp"
android:layout_marginRight="20dp"
android:textSize="16dp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall"
android:text="Category"
android:id="@+id/row_cat"
android:textSize="16dp"
android:layout_above="@+id/row_postPic"
android:layout_alignLeft="@+id/row_name"
android:layout_alignStart="@+id/row_name" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall"
android:text="UserId"
android:id="@+id/row_userid"
android:textColor="#000000"
android:textSize="18dp"
android:layout_alignTop="@+id/imageToDownload2"
android:layout_toRightOf="@+id/imageToDownload2"
android:layout_toEndOf="@+id/imageToDownload2"
android:layout_marginLeft="20dp"
android:layout_marginTop="20dp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall"
android:text="PostId"
android:id="@+id/row_postid"
android:layout_alignParentTop="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:textColor="#000000"
android:layout_marginTop="30dp" />
<TextView
android:layout_width="120dp"
android:layout_height="40dp"
android:text="Like"
android:id="@+id/row_like"
android:gravity="center"
android:layout_below="@+id/row_tittle"
android:layout_marginBottom="10dp"
android:layout_marginTop="10dp" />
</RelativeLayout>
</ScrollView>
</RelativeLayout>
这里是列表适配器
public class PostAdapter extends BaseAdapter {
Context context;
ArrayList<Post> listData;
public PostAdapter(Context context,ArrayList<Post> listData){
this.context = context;
this.listData = listData;
}
@Override
public int getCount() {
return listData.size();
}
@Override
public Object getItem(int position) {
return listData.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
class ViewHolder {
private TextView tvlike,tvTittle,tvPostId,tvUseId,tvName,tvCat,tvDate;
}
@Override
public View getView(int position, View view, ViewGroup viewGroup) {
ViewHolder viewHolder = null;
if(view == null){
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = inflater.inflate(R.layout.post_item,null);
viewHolder = new ViewHolder();
viewHolder.tvTittle = (TextView) view.findViewById(R.id.row_tittle);
viewHolder.tvPostId = (TextView) view.findViewById(R.id.row_postid);
viewHolder.tvUseId = (TextView) view.findViewById(R.id.row_userid);
viewHolder.tvName = (TextView) view.findViewById(R.id.row_name);
viewHolder.tvCat = (TextView) view.findViewById(R.id.row_cat);
viewHolder.tvlike = (TextView) view.findViewById(R.id.row_like);
viewHolder.tvDate = (TextView) view.findViewById(R.id.row_date);
view.setTag(viewHolder);
}else{
viewHolder = (ViewHolder) view.getTag();
}
Post post = listData.get(position);
String rpostid = post.getPost_id();
String ruserid = post.getUser_id();
String rname = post.getUser_name();
String rcat = post.getPost_cat();
String rlike = post.getLikes();
String rdate = post.getPost_time();
String rtittle = post.getPost_title();
viewHolder.tvPostId.setText(rpostid);
viewHolder.tvUseId.setText(ruserid);
viewHolder.tvName.setText(rname);
viewHolder.tvCat.setText("Category "+rcat);
viewHolder.tvlike.setText("Toatal Likes "+rlike);
viewHolder.tvDate.setText(rdate);
viewHolder.tvTittle.setText(rtittle);
return view;
}
}
这是家庭活动
public class Home extends Fragment {
ListView listView;
PostAdapter adapter;
TextView userId;
ArrayList<Post> postArrayList;
private SwipeRefreshLayout swipeRefreshLayout;
DBHandler handler;
View view;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
view = inflater.inflate(R.layout.activity_post, container, false);
listView = (ListView) view.findViewById(R.id.listview);
ConnectivityManager connectivityManager = (ConnectivityManager) getActivity().getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();
if(networkInfo != null && networkInfo.isConnected()){
new DataFetcherTask().execute();
}else{
Toast.makeText(getActivity(), "Internet Error", Toast.LENGTH_LONG).show();
}
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Toast.makeText(getActivity(), "Item clicked : " + position, Toast.LENGTH_LONG).show();
userId = (TextView)view.findViewById(R.id.row_userid);
Intent i = new Intent(getActivity(), PostView.class);
i.putExtra("userid", userId.getText().toString());
startActivity(i);
}
});
return view;
}
private class DataFetcherTask extends AsyncTask<Void, Void, Void> {
@Override
protected void onPreExecute() {
super.onPreExecute();
}
@Override
protected Void doInBackground(Void... args) {
String serverData = null;// String object to store fetched data from server
// Http Request Code start
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpGet httpGet = new HttpGet("http://xyz.lt/json.php");
try {
HttpResponse httpResponse = httpClient.execute(httpGet);
HttpEntity httpEntity = httpResponse.getEntity();
serverData = EntityUtils.toString(httpEntity);
Log.d("response", serverData);
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
// Http Request Code end
// Json Parsing Code Start
try {
postArrayList = new ArrayList<Post>();
JSONObject jsonObject = new JSONObject(serverData);
JSONArray jsonArray = jsonObject.getJSONArray("post");
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject jsonObjectPOST = jsonArray.getJSONObject(i);
String post_id = jsonObjectPOST.getString("post_id");
String user_id = jsonObjectPOST.getString("user_id");
String user_name = jsonObjectPOST.getString("user_name");
String post_title = jsonObjectPOST.getString("post_title");
String likes = jsonObjectPOST.getString("likes");
String post_cat = jsonObjectPOST.getString("post_cat");
String post_time = jsonObjectPOST.getString("post_time");
Post post = new Post();
post.setPost_id(post_id);
post.setUser_id(user_id);
post.setUser_name(user_name);
post.setPost_title(post_title);
post.setLikes(likes);
post.setPost_cat(post_cat);
post.setPost_time(post_time);
handler.addPost(post);// Inserting into DB
}
} catch (JSONException e) {
e.printStackTrace();
}
//Json Parsing code end
return null;
}
@Override
protected void onPostExecute(Void aVoid) {
super.onPostExecute(aVoid);
ArrayList<Post> postList = handler.getAllPost();
adapter = new PostAdapter(getActivity(), postList);
listView.setAdapter(adapter);
}
}
@Override
public void onResume() {
super.onResume();
new DataFetcherTask().execute();
ArrayList<Post> postList = handler.getAllPost();
adapter = new PostAdapter(getActivity(), postList);
listView.setAdapter(adapter);
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
handler = new DBHandler(getActivity());
new DataFetcherTask().execute();
}
}
我希望当项目点击时，此处将打开新活动是新活动
public class PostView extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_post_view);
TextView textView = (TextView) findViewById(R.id.textView3);
Intent intent = getIntent();
if (intent!=null) {
String stringData= intent.getStringExtra("userid");
textView.setText(stringData);
}
}
}
在这个项目中，当有些人点击listview项目时，它会将用户名的textview vaue传递给新意图但是作为列表项目clicklistner不能正常工作，所以我无法做到。
答案是：不要在Listview自定义项目中使用滚动视图。
答案 0 :(得分：1)
这可能听起来不相关，但是你会从ScrollView删除list item layout来试用你的代码吗？因为click事件是由scrollView拍摄的，因此您的onItemCLickListener
答案 1 :(得分：0)
据我所知，您已经在listview上应用onItemClick，这就是为什么它不起作用。 onitemclick和onClick没有合作更好的选项使用onClick代替onItemClick。
另一件事是在onCreateView中做其他事情并不好，因为它仅适用于View Inflate。从onCreateView中删除这行代码到onActivityCreated
listView = (ListView) view.findViewById(R.id.listview);
ConnectivityManager connectivityManager = (ConnectivityManager) getActivity().getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();
if(networkInfo != null && networkInfo.isConnected()){
new DataFetcherTask().execute();
}else{
Toast.makeText(getActivity(), "Internet Error", Toast.LENGTH_LONG).show();
}
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Toast.makeText(getActivity(), "Item clicked : " + position, Toast.LENGTH_LONG).show();
userId = (TextView)view.findViewById(R.id.row_userid);
Intent i = new Intent(getActivity(), PostView.class);
i.putExtra("userid", userId.getText().toString());
startActivity(i);
}
});
答案 2 :(得分：0)
try adding
android:descendantFocusability="blocksDescendants"
in your main layout
eg.`
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:descendantFocusability="blocksDescendants"
android:paddingBottom="1dp">`
and set OnItemClickListener to your listView