GridView 完美填充布局

在做项目时，有时候GridView的item和item之间的间距，间隔不好调节，显示在界面上很难看，下面来看如何实现的

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity">
<GridView
android:id="@+id/main_gridView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="none"
android:padding="5dp"
android:gravity="center"
android:numColumns="5"
android:stretchMode="columnWidth"
android:horizontalSpacing="3dp"
android:verticalSpacing="3dp" />

</LinearLayout>

gridview_item布局

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

<ImageView
android:id="@+id/main_gridView_item_photo"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:contentDescription="@null"
android:scaleType="centerCrop"
android:src="@drawable/empty_photo"
android:layout_centerInParent="true" />

</com.MyRelativeLayout>

MyRelativeLayout.java类

/**
* 正方形的RelativeLayout
*
*/
public class MyRelativeLayout extends RelativeLayout {
public MyRelativeLayout(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}

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

public MyRelativeLayout(Context context) {
super(context);
}

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

setMeasuredDimension(getDefaultSize(0, widthMeasureSpec), getDefaultSize(0, heightMeasureSpec));

// Children are just made to fill our space.
int childWidthSize = getMeasuredWidth();
//高度和宽度一样
widthMeasureSpec = MeasureSpec.makeMeasureSpec(childWidthSize, MeasureSpec.EXACTLY);
heightMeasureSpec = widthMeasureSpec;
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
}