Gridview有两列和自动调整大小的图像

Question

我正在尝试用两列制作gridview.我的意思是每排并排两张照片,就像这张照片一样.

但是我的照片之间有空格,因为它的大小不一样.这是我得到的.

如您所见,第一张图片隐藏了显示联系人姓名和电话号码的图例.而其他图片未正确拉伸.

这是我的GridView xml文件.如您所见,columnWidth设置为200dp.我希望它是自动的,所以图片会自动调整每个屏幕尺寸的大小.

<?xml version="1.0" encoding="utf-8"?>
<GridView 
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/gridViewContacts"
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent"
    android:numColumns="2"
    android:columnWidth="200dp"
    android:stretchMode="columnWidth"    
    android:gravity="center" />

这是项目xml文件,它代表每个项目本身.

<?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="match_parent" >

    <ImageView
        android:id="@+id/imageViewContactIcon"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:scaleType="fitXY" />

    <LinearLayout
        android:id="@+id/linearlayoutContactName"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:paddingLeft="5dp"
        android:paddingTop="5dp"
        android:paddingBottom="5dp"
        android:background="#99000000"
        android:layout_alignBottom="@+id/imageViewContactIcon">

        <TextView
            android:id="@+id/textViewContactName"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textColor="#FFFFFF"
            android:textStyle="bold"
            android:textSize="15sp"
            android:text="Lorem Ipsum" />       

        <TextView
            android:id="@+id/textViewContactNumber"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textColor="#FFFFFF"
            android:layout_marginLeft="5dp"
            android:focusable="true"
            android:ellipsize="marquee"
            android:marqueeRepeatLimit="marquee_forever"
            android:textSize="10sp"
            android:text="123456789" />

    </LinearLayout>

</RelativeLayout>

所以我想要的是每行显示两个图像,并且无论屏幕大小如何,图像都会自动调整大小.我在布局上做错了什么？

谢谢.

Answer 1

这是一个相对简单的方法.将GridView放入布局,设置拉伸模式以拉伸列宽,将间距设置为0(或任何您想要的),并将列数设置为2:

RES /布局/ main.xml中

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

    <GridView
        android:id="@+id/gridview"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:verticalSpacing="0dp"
        android:horizontalSpacing="0dp"
        android:stretchMode="columnWidth"
        android:numColumns="2"/>

</FrameLayout>

制作ImageView保持宽高比的自定义:

SRC/COM /示例/ graphicstest/SquareImageView.java

public class SquareImageView extends ImageView {
    public SquareImageView(Context context) {
        super(context);
    }

    public SquareImageView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public SquareImageView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        setMeasuredDimension(getMeasuredWidth(), getMeasuredWidth()); //Snap to width
    }
}

使用此SquareImageView为网格项创建布局,并将scaleType设置为centerCrop:

RES /布局/ grid_item.xml

<?xml version="1.0" encoding="utf-8"?>

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
             android:layout_width="match_parent"
             android:layout_height="match_parent">

    <com.example.graphicstest.SquareImageView
        android:id="@+id/picture"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:scaleType="centerCrop"/>

    <TextView
        android:id="@+id/text"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:paddingLeft="10dp"
        android:paddingRight="10dp"
        android:paddingTop="15dp"
        android:paddingBottom="15dp"
        android:layout_gravity="bottom"
        android:textColor="@android:color/white"
        android:background="#55000000"/>

</FrameLayout>

现在为您制作一些适配器GridView:

SRC/COM /示例/ graphicstest/MyAdapter.java

private final class MyAdapter extends BaseAdapter {
    private final List<Item> mItems = new ArrayList<Item>();
    private final LayoutInflater mInflater;

    public MyAdapter(Context context) {
        mInflater = LayoutInflater.from(context);

        mItems.add(new Item("Red",       R.drawable.red));
        mItems.add(new Item("Magenta",   R.drawable.magenta));
        mItems.add(new Item("Dark Gray", R.drawable.dark_gray));
        mItems.add(new Item("Gray",      R.drawable.gray));
        mItems.add(new Item("Green",     R.drawable.green));
        mItems.add(new Item("Cyan",      R.drawable.cyan));
    }

    @Override
    public int getCount() {
        return mItems.size();
    }

    @Override
    public Item getItem(int i) {
        return mItems.get(i);
    }

    @Override
    public long getItemId(int i) {
        return mItems.get(i).drawableId;
    }

    @Override
    public View getView(int i, View view, ViewGroup viewGroup) {
        View v = view;
        ImageView picture;
        TextView name;

        if (v == null) {
            v = mInflater.inflate(R.layout.grid_item, viewGroup, false);
            v.setTag(R.id.picture, v.findViewById(R.id.picture));
            v.setTag(R.id.text, v.findViewById(R.id.text));
        }

        picture = (ImageView) v.getTag(R.id.picture);
        name = (TextView) v.getTag(R.id.text);

        Item item = getItem(i);

        picture.setImageResource(item.drawableId);
        name.setText(item.name);

        return v;
    }

    private static class Item {
        public final String name;
        public final int drawableId;

        Item(String name, int drawableId) {
            this.name = name;
            this.drawableId = drawableId;
        }
    }
}

将该适配器设置为GridView:

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    GridView gridView = (GridView)findViewById(R.id.gridview);
    gridView.setAdapter(new MyAdapter(this));
}

并享受结果:

Answer 2

现在,对于遇到此问题的新用户,可以使用PercentRelativeLayout等现代内置函数的另一种简单方法.感谢android团队发布此项目.

<android.support.percent.PercentRelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:clickable="true"
app:layout_widthPercent="50%">

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ImageView
        android:id="@+id/picture"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:scaleType="centerCrop" />

    <TextView
        android:id="@+id/text"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom"
        android:background="#55000000"
        android:paddingBottom="15dp"
        android:paddingLeft="10dp"
        android:paddingRight="10dp"
        android:paddingTop="15dp"
        android:textColor="@android:color/white" />

</FrameLayout>

为了获得更好的性能,您可以使用一些像毕加索图像加载器这样的东西来帮助您填充每个图像父级的整个宽度.例如在你的适配器中你应该使用这个:

int width= context.getResources().getDisplayMetrics().widthPixels;
    com.squareup.picasso.Picasso
            .with(context)
            .load("some url")
            .centerCrop().resize(width/2,width/2)
            .error(R.drawable.placeholder)
            .placeholder(R.drawable.placeholder)
            .into(item.drawableId);

现在你不再需要CustomImageView Class了.

PS我建议在类Item中使用ImageView代替Type Int.

希望这有帮助..