Recyclerview 所选项目的背景图像在较小的屏幕设备上太大

Recyclerview selected item's background image too large on smaller screen devices

我有一个 RecyclerViewCardView 来显示项目。这些项目包含图片浏览量和 TextView 一旦用户 select 有一个项目,它就会被填充。一旦他们 select 一个项目,我检索 selected 项目的背景并激发打开新 activity 的意图,我在其中动态创建布局并 将 selected 项目的背景设置为布局的背景。这是我的适配器 class 填充我的 RecyclerView 我检索 selected 项目的背景。

public class PersonsAdapter extends RecyclerView.Adapter<PersonsAdapter.MyViewHolder> {

        private List<Person> mpersonsList;


        public class MyViewHolder extends RecyclerView.ViewHolder {
            public TextView name .....;
            View v;
            Person p;

            public MyViewHolder(View view) {
                super(view);
                name = (TextView) view.findViewById(R.id.tvName);
                //and all other textviews....

                v = view;
                v.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View view) {
                        //if (view.getId() == getAdapterPosition()) {
                            //int itemposition = mRecyclerView.indexOfChild(v);
                            Intent i = new Intent(context, SelectedTemplate.class);
                            startActivity(i);
                            theBackground = view.getBackground();//retrieve the background of the selected item
                        //}
                    }
                });
                List<Drawable> templatesList = new ArrayList<>();
            }
        }


        public PersonsAdapter(List<Person> personsList) {
            this.mpersonsList = personsList;
        }

        @Override
        public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
            View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.person, parent, false);

            return new MyViewHolder(itemView);
        }

        @Override
        public void onBindViewHolder(MyViewHolder holder, int position) {
            Person person = mpersonsList.get(position);
            holder.name.setText(person.getName());
            //and other details of the item......

            holder.p = mpersonsList.get(position);

            if(position == 0){
                holder.v.setBackgroundResource(R.drawable.wavy_curves_onblack);
            } 
        //and other background images.....
        }

        @Override
        public int getItemCount() {
            return mpersonsList.size();
        }
    }

在下一个 activity 中,我按如下方式检索 selected 项目。

private void getSelectedTemplate() {
        LayoutInflater vi = (LayoutInflater) getApplicationContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View v = vi.inflate(R.layout.selected_template, null);

        // fill in any details dynamically here


        //insert into main view
        ViewGroup insertPoint = (ViewGroup) findViewById(R.id.selectedtemplatelayout);
        insertPoint.setBackground(TheTemplates.theBackground);
        insertPoint.addView(v, 0, new ViewGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT));

        rl = (LinearLayout) findViewById(R.id.selectedtemplatelayout);
        image.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT));
        image.getLayoutParams().height = (int) getResources().getDimension(R.dimen.image_height);
        image.getLayoutParams().width = (int) getResources().getDimension(R.dimen.image_width);



        name.setText("NAME");
        name.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT));
        //add all other textviews dynamically.....

        rl.removeAllViews();
        rl.addView(image);
        rl.addView(name);
        //add all remaining textviews
    }

当我在模拟器或小于 5.5 英寸的设备上测试它时,我看到非常大的背景(我可以永远滚动),我只能看到两个图像,但看不到文本视图。在较大的设备(包括真实设备和模拟器)中,我得到了正确尺寸的背景。但我看不到像较小的文本视图 设备。不过我看到了这两张图片。

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:orientation="vertical"
    android:focusable="true"
    android:focusableInTouchMode="true"><!--this two lines will hide the keyboard and make the NAME textview visible -->
    <android.support.v7.widget.Toolbar
        android:id="@+id/my_toolbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/ThemeOverlay.AppCompat.ActionBar"
        app:popupTheme="@style/ThemeOverlay.AppCompat.Light"/>
    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

    <LinearLayout
        android:id="@+id/selectedtemplatelayout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:padding="4dp"
        android:orientation="vertical" >
//this is the layout I would like to stuff all my textviews and images and //set the background of the selected item.
    </LinearLayout>

    </ScrollView>


//another layout
    <ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:fillViewport="true">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical">
        </LinearLayout>
    </ScrollView>
</LinearLayout>

这是RecyclerView

<?xml version="1.0" encoding="utf-8"?>
<!--<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">-->

    <android.support.v7.widget.RecyclerView
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        android:id="@+id/templateList"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_gravity="center_horizontal"
        />
<!--</LinearLayout>-->

我似乎无法弄清楚为什么会发生这种情况以及如何解决它。感谢任何帮助。

一样创建文件夹

Mobile : 创建不同值的文件夹,如下所述:

values                     (For mdpi devices)
values-hdpi                (For hdpi devices)
values-xhdpi               (For xhdpi devices)
values-xxhdpi              (For xxhdpi devices)

平板电脑:创建不同的布局文件夹,如下所述:

layout-sw600dp             (For 7? to 9? Screen)
layout-sw720dp             (For 10? to above screen)

图片资源:创建4个drawable文件夹:

drawable-mdpi
drawable-hdpi
drawable-xhdpi
drawable-xxhdpi

如果您通过 api 处理它。使用不同的图像大小 imagesmall_link imagelarge_link imagexlarge_link

我通过简单地将布局高度从 wrap_content 更改为 300dp 之类的有限尺寸来解决尺寸问题,这似乎适用于所有屏幕尺寸。但是文本视图在所有屏幕上都不可见,这很奇怪。当我解决这个问题时,我会更新这个答案,这样它有时可能会对某人有所帮助。