为什么我的“帖子”？在android recyclerview中加载不同的大小？ [英] Why are my "posts" loading in different sizes in android recyclerview?
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问题描述
好的，这就是我的recyclerview显示我的帖子的方式。谁能告诉我为什么？我也会发布源代码。我试过改变一些代码没有成功。此外，当我滚动浏览RecyclerView时，其中一些会调整为更小或更大的尺寸。任何和所有帮助表示赞赏！
Okay, this is how my recyclerview is showing my "posts". Can anyone tell me why? I will post source code as well. I have tried changing some of the code with no success. Also, when I scroll through my RecyclerView, some of them resize to smaller or larger sizes. Any and all help is appreciated!
fragment_home.xml：
fragment_home.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.RecyclerView
android:id="@+id/recyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#fff" />
</LinearLayout>
list_item.xml：
list_item.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:id="@+id/listItemLayout">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<ImageButton
android:id="@+id/yesButton"
android:layout_width="0dp"
android:layout_height="40dp"
android:layout_weight="1"
android:background="#00FF00" />
<ImageButton
android:id="@+id/noButton"
android:layout_width="0dp"
android:layout_height="40dp"
android:layout_weight="1"
android:background="#FF0000" />
</LinearLayout>
<com.android.volley.toolbox.NetworkImageView
android:id="@+id/image_1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:src="@drawable/placeholder" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="5dp"
android:background="#509f9f9f"
android:orientation="horizontal">
<LinearLayout
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="8"
android:orientation="horizontal">
<com.android.volley.toolbox.NetworkImageView
android:id="@+id/thumbnail"
android:layout_width="40dp"
android:layout_height="40dp"
android:scaleType="fitXY"
android:src="@drawable/placeholder" />
<TextView
android:id="@+id/pUsername"
android:layout_marginLeft="5dp"
android:layout_marginStart="5dp"
android:gravity="center_vertical"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:text="username" />
</LinearLayout>
<LinearLayout
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:orientation="horizontal">
<ImageButton
android:id="@+id/postMenu"
android:layout_width="match_parent"
android:layout_height="40dp"
android:background="#000"/>
</LinearLayout>
</LinearLayout>
</LinearLayout>
LruBitmapCache.java：
LruBitmapCache.java:
public class LruBitmapCache extends LruCache<String, Bitmap> implements ImageCache {
public LruBitmapCache(int maxSize) {
super(maxSize);
}
public LruBitmapCache(Context context) {
this(getCacheSize(context));
}
@Override
protected int sizeOf(String key, Bitmap value) {
return value.getRowBytes() * value.getHeight();
}
@Override
public Bitmap getBitmap(String url) {
return get(url);
}
@Override
public void putBitmap(String url, Bitmap bitmap) {
put(url, bitmap);
}
public static int getCacheSize(Context context) {
final DisplayMetrics displayMetrics = context.getResources().getDisplayMetrics();
final int screenWidth = displayMetrics.widthPixels;
final int screenHeight = displayMetrics.heightPixels;
final int screenBytes = screenWidth * screenHeight * 4;
return screenBytes * 3;
}
}
MyRecyclerAdapter.java：
MyRecyclerAdapter.java:
public class MyRecyclerAdapter extends RecyclerView.Adapter<ListRowViewHolder> {
private List<ListItems> listItemsList;
private Context mContext;
private ImageLoader mImageLoader;
private int focusedItem = 0;
public MyRecyclerAdapter(Context context, List<ListItems> listItemsList) {
this.mContext = context;
this.listItemsList = listItemsList;
}
@Override
public ListRowViewHolder onCreateViewHolder(final ViewGroup viewGroup, int position) {
View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.list_item, null);
ListRowViewHolder holder = new ListRowViewHolder(v);
return holder;
}
@Override
public void onBindViewHolder(final ListRowViewHolder listRowViewHolder, int position) {
ListItems listItems = listItemsList.get(position);
listRowViewHolder.itemView.setSelected(focusedItem == position);
listRowViewHolder.getLayoutPosition();
mImageLoader = MySingleton.getInstance(mContext).getImageLoader();
listRowViewHolder.thumbnail.setImageUrl(listItems.getProfilePicture(), mImageLoader);
listRowViewHolder.thumbnail.setDefaultImageResId(R.drawable.placeholder);
listRowViewHolder.image_1.setImageUrl(listItems.getImage_1(), mImageLoader);
listRowViewHolder.image_1.setDefaultImageResId(R.drawable.placeholder);
listRowViewHolder.username.setText(Html.fromHtml(listItems.getUsername()));
}
public void clearAdapter() {
listItemsList.clear();
notifyDataSetChanged();
}
@Override
public int getItemCount() {
return (null != listItemsList ? listItemsList.size() : 0);
}
}
MySingleton.java：
MySingleton.java:
public class MySingleton {
private static MySingleton mInstance;
private RequestQueue mRequestQueue;
private ImageLoader mImageLoader;
private static Context mContext;
private MySingleton(Context context) {
mContext = context;
mRequestQueue = getRequestQueue();
mImageLoader = new ImageLoader(mRequestQueue, new LruBitmapCache(LruBitmapCache.getCacheSize(mContext)));
}
public static synchronized MySingleton getInstance(Context context) {
if (mInstance == null) {
mInstance = new MySingleton(context);
}
return mInstance;
}
public RequestQueue getRequestQueue() {
if (mRequestQueue == null) {
mRequestQueue = Volley.newRequestQueue(mContext.getApplicationContext());
}
return mRequestQueue;
}
public <T> void addToRequestQueue(Request<T> req) {
getRequestQueue().add(req);
}
public ImageLoader getImageLoader() {
return mImageLoader;
}
}
ListRowViewHolder.java：
ListRowViewHolder.java:
public class ListRowViewHolder extends RecyclerView.ViewHolder {
protected NetworkImageView thumbnail;
protected NetworkImageView image_1;
protected ImageButton yes;
protected ImageButton no;
protected TextView username;
protected LinearLayout recLayout;
public ListRowViewHolder(View view) {
super(view);
this.thumbnail = (NetworkImageView) view.findViewById(R.id.thumbnail);
this.image_1 = (NetworkImageView) view.findViewById(R.id.image_1);
this.yes = (ImageButton) view.findViewById(R.id.yesButton);
this.no = (ImageButton) view.findViewById(R.id.noButton);
this.username = (TextView) view.findViewById(R.id.pUsername);
this.recLayout = (LinearLayout) view.findViewById(R.id.listItemLayout);
view.setClickable(true);
}
}
FragmentHome.java：
FragmentHome.java:
public class FragmentHome extends Fragment {
private final String postsUrl = "http://www.example.com/fetch_posts.php";
private ProgressDialog progressDialog;
private static final String TAG = "RecyclerViewExample";
private List<ListItems> listItemsList = new ArrayList<>();
private RecyclerView mRecyclerView;
private MyRecyclerAdapter adapter;
public FragmentHome() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (container == null) {
return null;
}
View view = inflater.inflate(R.layout.fragment_home, container, false);
mRecyclerView = (RecyclerView) view.findViewById(R.id.recyclerView);
mRecyclerView.addItemDecoration(
new HorizontalDividerItemDecoration.Builder(getActivity())
.color(Color.BLACK)
.build());
final LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getActivity());
mRecyclerView.setLayoutManager(linearLayoutManager);
updateFeed();
return view;
}
public void updateFeed() {
showPD();
adapter = new MyRecyclerAdapter(getActivity(), listItemsList);
mRecyclerView.setAdapter(adapter);
RequestQueue request = Volley.newRequestQueue(getActivity());
adapter.clearAdapter();
JsonArrayRequest req = new JsonArrayRequest(postsUrl, new Response.Listener<JSONArray>() {
@Override
public void onResponse(JSONArray response) {
Log.d(TAG, response.toString());
try {
for (int i = 0; i < response.length(); i++) {
JSONObject post = (JSONObject) response.get(i);
ListItems item = new ListItems();
item.setImage_1(post.getString("image_1"));
item.setUsername(post.getString("username"));
item.setProfilePicture(post.getString("image_1"));
listItemsList.add(item);
}
} catch (JSONException e) {
e.printStackTrace();
Toast.makeText(getActivity(), "Error: " + e.getMessage(), Toast.LENGTH_LONG).show();
}
adapter.notifyDataSetChanged();
hidePD();
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d(TAG, "Error: " + error.getMessage());
hidePD();
Toast.makeText(getActivity(), "Volley Error: " + error.getMessage(), Toast.LENGTH_LONG).show();
}
});
request.add(req);
}
private void showPD() {
if (progressDialog == null) {
progressDialog = new ProgressDialog(getActivity());
progressDialog.setMessage("Loading...");
progressDialog.setCancelable(false);
progressDialog.setCanceledOnTouchOutside(false);
progressDialog.show();
}
}
private void hidePD() {
if (progressDialog != null) {
progressDialog.dismiss();
progressDialog = null;
}
}
@Override
public void onDestroy() {
super.onDestroy();
hidePD();
}
}
推荐答案
你没有在 onCreateViewHolder（）中正确夸大你的查看而不是
You're not properly inflating your View in onCreateViewHolder() Instead of
View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.list_item, null);
你应该使用
View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.list_item, viewGroup, false);
参见这个答案有关不同的 LayoutInflater.inflate（）方法的详细信息。
See this answer for more details on the different LayoutInflater.inflate() methods.
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