android - GridView 中的图像很小

Question

我试图在 GridView 中显示图书列表，但图像比预期的要小。我搜索了这个问题，并在 stackoverflow 上找到了一些答案，这些答案告诉我们要使用 imageView.setLayoutParams(new GridView.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT)); 在我的适配器中，但无论我如何尝试，它都没有帮助我。

here's my problem screen

这是我的 BookAdapter.java `

package com.example.android.slavabooks;

import android.content.Context;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import java.util.ArrayList;

public class BookAdapter extends ArrayAdapter<Book> {
    public BookAdapter(@NonNull Context context, ArrayList<Book> books) {
        super(context, 0, books);
    }

    @NonNull
    @Override
    public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
        View gridView = convertView;
        if (gridView == null) {
            gridView = LayoutInflater.from(getContext()).inflate(R.layout.one_book, parent, false);
        }


        Book currentBook = getItem(position);

        TextView title = (TextView) gridView.findViewById(R.id.title_text_view);
        TextView author = (TextView) gridView.findViewById(R.id.author_text_view);

        ImageView imageView = (ImageView) gridView.findViewById(R.id.book_image);
        imageView.setImageDrawable(currentBook.getBookImage());

        title.setText(currentBook.getTitle());
        author.setText(currentBook.getAuthor());

        return gridView;
    }

}`

这是我的 activity_search_results.xml 和一个 GridView

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".SearchResults">
    <GridView
        android:divider="@null"
        android:dividerHeight="10dp"
        android:padding="10dp"
        android:id="@+id/grid_view"
        android:numColumns="2"
        android:verticalSpacing="10dp"
        android:horizontalSpacing="10dp"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>
    <ProgressBar
        android:id="@+id/progress_bar"
        android:layout_centerInParent="true"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
</RelativeLayout>

one_book.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:padding="12sp"
    android:layout_margin="5dp"
    android:minHeight="200dp"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_height="wrap_content">
    <ImageView
        android:id="@+id/book_image"
        android:src="@drawable/book"
        android:layout_centerHorizontal="true"
        android:adjustViewBounds="true"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
    <TextView
        android:id="@+id/title_text_view"
        android:fontFamily="sans-serif-medium"
        android:maxLines="1"
        tools:text="Title"
        android:gravity="center"
        android:textSize="15sp"
        android:layout_below="@id/book_image"
        android:layout_centerHorizontal="true"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
    <TextView
        android:id="@+id/author_text_view"
        android:maxLines="1"
        android:gravity="center"
        tools:text="Author"
        android:textSize="10sp"
        android:layout_below="@id/title_text_view"
        android:layout_width="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_height="wrap_content" />

</RelativeLayout>

Answer 1

您已将宽度和高度设置为“wrap_content”值。这意味着图像假定其尽可能小的尺寸。在布局资源中将具有高度和宽度的标签更改为“ma​​tch_parent”。

在one_book.xml中:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    ...
    android:layout_height="wrap_content">

    <ImageView
        android:id="@+id/book_image"
        android:src="@drawable/book"
        ...
        android:layout_width="match_parent" 
        android:layout_height="match_parent" /> <!-- THESE width and height -->
...
</RelativeLayout>