[英]RecyclerView inside of NestedScrollView only showing 1 element at a time
[英]RecyclerView is not showing in NestedScrollView
我在 StackOverflow 上看過一些類似的事件。 然而,似乎沒有一個適用於我的情況。 我遇到的問題是我的 RecyclerView 正在工作但沒有顯示任何內容。 我已經運行了多個測試來試圖找出它為什么不起作用,但所有測試都支持它正常工作的事實。
getItemCount 中的日志返回 3,這是正確的數字。 我只是不明白為什么它不顯示。 我回顧了我在之前的活動中所做的回收者視圖,它們都在一定程度上匹配(其他回收者有更多信息需要設置)。
感謝您提供任何幫助。
編輯:我發現了問題,但仍需要幫助。 這是導致它折疊的工具欄。 如果我將 RecyclerView 移到 NestedScrollView 之外,我可以看到這些項目。 但是,內容不會像activity_project_detail.xml 中注釋掉的TextView 那樣正確移動。 我想我的新問題是如何讓 RecyclerView 在 NestedScrollView 中工作。 謝謝!
項目詳細信息Activity.java
package com.austinerck.projectpanda.activity;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import com.austinerck.projectpanda.R;
import com.austinerck.projectpanda.adapter.TaskAdapter;
import com.austinerck.projectpanda.data.LocalDatabase;
import com.austinerck.projectpanda.data.Project;
import com.austinerck.projectpanda.data.Task;
import java.util.ArrayList;
public class ProjectDetailsActivity extends AppCompatActivity {
private boolean connectionState;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_project_details);
//Sets toolbar and up navigation
setSupportActionBar((Toolbar) findViewById(R.id.toolbar));
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
//Gets the connection state from the intent
connectionState = getIntent().getExtras().getBoolean(LocalDatabase.CONNECTION_STATE);
//Gets the projects from the intent
Project project = getIntent().getExtras().getParcelable(LocalDatabase.PROJECT_DETAILS);
//Sets activity title
setTitle(project.getTitle());
//Generates Task arrays
ArrayList<Task> tasksUncompleted = Task.getUncompletedTasks(project.getTasks());
ArrayList<Task> tasksCompleted = Task.getCompletedTasks(project.getTasks());
//TODO: Fix recycler views
RecyclerView recyclerUncompleted = (RecyclerView) findViewById(R.id.detail_uncompleted);
recyclerUncompleted.setLayoutManager(new LinearLayoutManager(this));
recyclerUncompleted.setAdapter(new TaskAdapter(tasksUncompleted));
registerForContextMenu(recyclerUncompleted);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_projects_list, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
任務適配器
package com.austinerck.projectpanda.adapter;
import android.app.Activity;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.austinerck.projectpanda.R;
import com.austinerck.projectpanda.data.LocalDatabase;
import com.austinerck.projectpanda.data.Project;
import com.austinerck.projectpanda.data.ProjectCardView;
import com.austinerck.projectpanda.data.Task;
import com.austinerck.projectpanda.data.TaskView;
import java.util.ArrayList;
public class TaskAdapter extends RecyclerView.Adapter {
private ArrayList<Task> tasks;
public TaskAdapter(ArrayList<Task> tasks) {
this.tasks = tasks;
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
//Selects the layout used in the Recycler
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.fragment_task, parent, false);
return new TaskView(view);
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
TaskView view = (TaskView) holder;
//Gets the views that need to be changed
view.getTitle().setText(tasks.get(position).getTitle());
view.getSubtitle().setText(tasks.get(position).getSubtitle());
view.getCheckbox().setChecked(tasks.get(position).isCompleted());
}
@Override
public int getItemCount() {
Log.e(LocalDatabase.LOG_TAG, "GetItemCount: " + tasks.size());
return tasks.size();
}
}
任務視圖.java
package com.austinerck.projectpanda.data;
import android.app.Activity;
import android.content.Intent;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.widget.CheckBox;
import android.widget.TextView;
import com.austinerck.projectpanda.R;
import com.austinerck.projectpanda.activity.ProjectDetailsActivity;
import com.austinerck.projectpanda.activity.ProjectsListActivity;
import com.austinerck.projectpanda.activity.WelcomeActivity;
public class TaskView extends RecyclerView.ViewHolder {
private View view;
private TextView title, subtitle;
private CheckBox checkbox;
public TaskView(View view) {
super(view);
//Gets the different parts of a layout
this.view = view;
this.title = (TextView) view.findViewById(R.id.task_title);
this.subtitle = (TextView) view.findViewById(R.id.task_subtitle);
this.checkbox = (CheckBox) view.findViewById(R.id.task_checkbox);
}
public View getView() {
return view;
}
public TextView getTitle() {
return title;
}
public TextView getSubtitle() {
return subtitle;
}
public CheckBox getCheckbox() {
return checkbox;
}
}
activity_project_details.xml
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/main_content"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="192dp"
android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
android:fitsSystemWindows="true">
<android.support.design.widget.CollapsingToolbarLayout
android:id="@+id/toolbar_collapsing"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_scrollFlags="scroll|exitUntilCollapsed"
android:fitsSystemWindows="true"
app:contentScrim="?attr/colorPrimary"
app:expandedTitleMarginStart="48dp"
app:expandedTitleMarginEnd="64dp">
<ImageView
android:id="@+id/detail_background"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scaleType="centerCrop"
android:fitsSystemWindows="true"
app:layout_collapseMode="parallax"/>
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:popupTheme="@style/ThemeOverlay.AppCompat.Light"
app:layout_collapseMode="pin"/>
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
<android.support.v4.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="fill_vertical"
app:layout_behavior="@string/appbar_scrolling_view_behavior">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<!--<TextView
android:layout_width="match_parent"
android:layout_height="@dimen/detail_header_height"
android:paddingLeft="@dimen/spacing_m"
android:gravity="center_vertical"
android:text="@string/details_uncomp"
android:textSize="@dimen/text_body"
android:textColor="@color/text_subheader"/>-->
<android.support.v7.widget.RecyclerView
android:id="@+id/detail_uncompleted"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
<!--<TextView
android:layout_width="match_parent"
android:layout_height="@dimen/detail_header_height"
android:paddingLeft="@dimen/spacing_m"
android:gravity="center_vertical"
android:text="@string/details_comp"
android:textSize="@dimen/text_body"
android:textColor="@color/text_subheader"/>-->
</LinearLayout>
</android.support.v4.widget.NestedScrollView>
fragment_task.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="@dimen/spacing_xxl"
android:paddingLeft="@dimen/spacing_m"
android:paddingRight="@dimen/spacing_m"
android:gravity="center_vertical">
<CheckBox
android:id="@+id/task_checkbox"
android:layout_width="@dimen/spacing_l"
android:layout_height="@dimen/spacing_l" />
<LinearLayout
android:orientation="vertical"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingLeft="@dimen/spacing_xl">
<TextView
android:id="@+id/task_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Set Austin on fire"
android:textSize="@dimen/text_subheading"
android:textColor="@color/text"/>
<TextView
android:id="@+id/task_subtitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Light Austin on fire using a Zippo"
android:textSize="@dimen/text_body"
android:textColor="@color/text_subheader"/>
</LinearLayout>
</LinearLayout>
將此屬性添加到 NestedScrollView:
android:fillViewport="true"
首先,將fillViewport屬性添加到您的NestedScrollView :
<android.support.v4.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="fill_vertical"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
android:fillViewport="true">
另外,你必須在RecyclerView的LayoutManager中使用setAutoMesureEnabled方法:
LinearLayoutManager linearLayoutManager = new LinearLayoutManager( getActivity() );
linearLayoutManager.setOrientation( LinearLayoutManager.VERTICAL );
linearLayoutManager.setAutoMeasureEnabled( true );
setAutoMeasureEnabled方法自 23.2 起在支持設計庫中可用。
這太瘋狂了,但對我有用。 在 RecycelrView 屬性中添加一個屬性 android:padding="16" 。
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/toppers_recycler_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="@dimen/large_space"
/>
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