自定义方形LinearLayout.如何? [英] Custom Square LinearLayout. How?
本文介绍了自定义方形LinearLayout.如何?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我为方形布局创建自己的类:
I create my own class for the square layout:
public class SquareLayout extends LinearLayout{
public SquareLayout(Context context) {
super(context);
}
public SquareLayout(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
public SquareLayout(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int width = MeasureSpec.getSize(widthMeasureSpec);
int height = MeasureSpec.getSize(heightMeasureSpec);
int size = width > height ? height : width;
setMeasuredDimension(size, size);
}
然后,在我的xml中:
Then, in my xml:
...
<com.myApp.SquareLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_gravity="center_horizontal"
android:orientation="horizontal" >
<ImageView
android:id="@+id/cellImageView"
android:adjustViewBounds="true"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginTop="2dp"
android:padding="2dp"
android:scaleType="centerCrop"
android:src="@drawable/image" />
</com.myApp.SquareLayout>
...
我的Java代码中再也没有写什么了. 但是相反,如果我的布局和图片,我只会看到一个白色的矩形...
Nothing written more in my java code. But instead if my layout and my Image, I see only a white rectangle...
我怎么了?
推荐答案
//忘记调用super.onMeasure(widthMeasureSpec,widthMeasureSpec);
// you forget to call super.onMeasure(widthMeasureSpec, widthMeasureSpec);
@Override
public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, widthMeasureSpec);
int width = MeasureSpec.getSize(widthMeasureSpec);
int height = MeasureSpec.getSize(heightMeasureSpec);
int size = width > height ? height : width;
setMeasuredDimension(size, size);
}
//xml文件
<com.example.testapplication.SquareLayout
android:id="@+id/layout"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_gravity="center_horizontal"
android:orientation="horizontal" >
<ImageView
android:id="@+id/cellImageView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="2dp"
android:adjustViewBounds="true"
android:padding="2dp"
android:scaleType="centerCrop"
android:src="@drawable/ic_launcher" />
</com.example.testapplication.SquareLayout>
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