viewpager的layout_width="wrap_content"无效问题
在viewpager当中直接使用layout_width="wrap_content"是无效的，扩展了一下。解决这个问题。
看下面代码:
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package com.soulagou.ui;
import android.content.Context;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.view.ViewGroup;
import android.view.ViewParent;
import android.widget.FrameLayout;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
/**
*
* @author pangxg
* @title 扩展viewPager
* @description 和一般的ViewPager一样使用
*/
public class ViewPager extends android.support.v4.view.ViewPager{
//private static final String tag=ViewPager.class.getSimpleName();
protected ViewPager viewPager=null;
protected final int wrap_content=-2;
protected final int match_parent=-1;
protected int w =match_parent;
protected int h =match_parent;
protected int ph =match_parent;
protected int pw =match_parent;
public ViewPager(Context context) {
super(context);
viewPager=this;
}
public ViewPager(Context context, AttributeSet attrs) {
super(context, attrs);
viewPager=this;
}
@Override
protected void onLayout(boolean arg0, int arg1, int arg2, int arg3, int arg4) {
super.onLayout(arg0, arg1, arg2, arg3, arg4);
ViewGroup.LayoutParams params =null;
ph=viewPager.getLayoutParams().height;
pw=viewPager.getLayoutParams().width;
Drawable bg= viewPager.getBackground();
if (bg!=null) {
int h = bg.getIntrinsicHeight();
int w= bg.getIntrinsicWidth();
if (ph==wrap_content) {
this.h=h;
}else if( ph==match_parent) {
this.h=ph;
}
if (pw==wrap_content) {
this.w=w;
}else if( pw==match_parent) {
this.w=pw;
}
}
viewPager.setBackgroundColor(getResources().getColor(android.R.color.transparent));
ViewParent pv=viewPager.getParent();
if (pv instanceof LinearLayout) {
params = new LinearLayout.LayoutParams(this.w, this.h);
}else if (pv instanceof RelativeLayout) {
params = new RelativeLayout.LayoutParams(this.w, this.h);
}else if (pv instanceof FrameLayout) {
params = new FrameLayout.LayoutParams(this.w, this.h);
}
viewPager.setLayoutParams(params);
}
@Override
protected void onMeasure(int arg0, int arg1) {
super.onMeasure(arg0, arg1);
}
}
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在xml中和原来的viewPager一样使用就可以了。
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<FrameLayout android:layout_marginTop="13dp" android:layout_gravity="center_horizontal" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="@drawable/bord_indexbg">
<com.soulagou.ui.ViewPager
android:id="@+id/myindex_guidePager"
android:layout_gravity="center_horizontal"
android:layout_marginTop="5dp"
android:background="@drawable/defa_advpic"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
</com.soulagou.ui.ViewPager>
</FrameLayout>
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好用吧。