public class PercentRelativeLayout extends RelativeLayout{ public PercentRelativeLayout(Context context) { super(context); } public PercentRelativeLayout(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); } public PercentRelativeLayout(Context context, AttributeSet attrs) { super(context, attrs); } /** * 重写测量方法 */ @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { // 先拿到父控件的宽高 int width = View.MeasureSpec.getSize(widthMeasureSpec); int height = View.MeasureSpec.getSize(heightMeasureSpec); int count = this.getChildCount(); for (int i = 0; i < count; i++) {// 循环迭代子控件 View child = this.getChildAt(i);// 取出每一个子控件 ViewGroup.LayoutParams lp = child.getLayoutParams(); float widthPercent = 0; float hightPercent = 0; if (lp instanceof PercentRelativeLayout.LayoutParams) {// 支持百分比布局 widthPercent = ((PercentRelativeLayout.LayoutParams) lp).widthPercent; hightPercent = ((PercentRelativeLayout.LayoutParams) lp).heightPercent; } if (widthPercent != 0) { // 父容器的宽*宽的百分比 lp.width = (int) (width * widthPercent); } if (hightPercent != 0) { // 父容器的高*高的百分比 lp.height = (int) (height * hightPercent); } } super.onMeasure(widthMeasureSpec, heightMeasureSpec); } /** * 重写对子控件布局方法 */ @Override protected void onLayout(boolean changed, int l, int t, int r, int b) { super.onLayout(changed, l, t, r, b); } /** * 重写对子控件布局属性进行获取解析 */ @Override public LayoutParams generateLayoutParams(AttributeSet attrs) { // return super.generateLayoutParams(attrs);// 这里必须返回下面自定的LayoutParams return new LayoutParams(getContext(), attrs); } public static class LayoutParams extends RelativeLayout.LayoutParams{ private float widthPercent; private float heightPercent; public LayoutParams(Context c, AttributeSet attrs) { super(c, attrs); TypedArray a = c.obtainStyledAttributes(attrs,R.styleable.precentRelativeLayout); widthPercent = a.getFloat(R.styleable.precentRelativeLayout_layout_widthPrecent, widthPercent); heightPercent = a.getFloat(R.styleable.precentRelativeLayout_layout_heightPrecent, heightPercent); a.recycle(); } public LayoutParams(int w, int h) { super(w, h); } public LayoutParams(android.view.ViewGroup.LayoutParams source) { super(source); } public LayoutParams(android.widget.RelativeLayout.LayoutParams source) { super(source); } } }
<!--?xml version="1.0" encoding="utf-8"?--> <resources> <declare-styleable name="precentRelativeLayout"> </attr> </attr> </declare-styleable> </resources>
com.castiel.demo.percentrelativelayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res/com.castiel.demo" android:layout_width="match_parent" android:layout_height="match_parent"> <textview android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignparenttop="true" app:layout_heightprecent="0.2" app:layout_widthprecent="0.2" android:background="#28FF28" android:text="http://blog.csdn.net/mynameishuangshuai"> <textview android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerinparent="true" app:layout_heightprecent="0.3" app:layout_widthprecent="0.3" android:background="#28FF28" android:text="猴子搬来的救兵"> <textview android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignparentbottom="true" app:layout_heightprecent="0.2" app:layout_widthprecent="0.2" android:background="#28FF28" android:text="castiel"> </textview></textview></textview></com.castiel.demo.percentrelativelayout>