Gridview with two columns and auto resized images
I'm trying to make a gridview with two columns. I mean two photos per row side by side just like this image.
But my pictures have spaces between them, due to the fact that it's not the same size. Here is what I'm getting.
as you can see the first picture hides the legend which shows the contact name and phone number. and the other pictures are not stretched correctly.
Here is my GridView xml file. As you can see the columnWidth is set to 200dp . I'd like it to be automatic , so the pictures will resize automatically for each screen size.
<?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" />
and here is the item xml file, which represents each item itself.
<?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>
So what I want, is to show two images per row, and the images auto resized, no matter the screen size. What am I doing wrong on my layout?
Thanks.
Here's a relatively easy method to do this. Throw a GridView into your layout, setting the stretch mode to stretch the column widths, set the spacing to 0 (or whatever you want), and set the number of columns to 2:
res/layout/main.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">
<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>
Make a custom ImageView that maintains its aspect ratio:
src/com/example/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
}
}
Make a layout for a grid item using this SquareImageView and set the scaleType to centerCrop:
res/layout/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>
Now make some sort of adapter for your GridView :
src/com/example/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;
}
}
}
Set that adapter to your 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));
}
And enjoy the results:
another simple approach with modern built-in stuff like PercentRelativeLayout is now available for new users who hit this problem. thanks to android team for release this item.
<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>
and for better performance you can use some stuff like picasso image loader which help you to fill whole width of every image parents. for example in your adapter you should use this:
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);
now you dont need CustomImageView Class anymore.
PS i recommend to use ImageView in place of Type Int in class Item.
hope this help..
链接地址: http://www.djcxy.com/p/49626.html上一篇: 如何获得泛型类型T的类实例