ViewPager实现Gallery画廊效果——仿慕课网app-求职路线计划-效果(一)
效果图:
大体上就是这个样子,可能不太清楚 但是大家知道是什么效果就好啦~
(PS: 图中没有加高斯模糊图,后边 我会加上)
下面来分析一下这个布局
底层用一个ImageView 上层用一个定制的ViewPager然后用FramLayout来包裹
代码:
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout 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:orientation="vertical">
<ImageView
android:id="@+id/iv_bg_pic"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scaleType="fitXY"
android:src="@drawable/expert_list_bg_default"/>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:clipChildren="false">
<TextView
android:id="@+id/tv_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_gravity="center_horizontal"
android:text="求职路线计划"
android:paddingTop="60dp"
android:paddingBottom="45dp"
android:textColor="#fff"
android:textSize="18sp"/>
<android.support.v4.view.ViewPager
android:layout_below="@+id/tv_title"
android:id="@+id/vp_pager"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="45dp"
android:layout_marginRight="45dp"
android:layout_marginBottom="30dp"
android:clipChildren="false"/>
</RelativeLayout>
</FrameLayout>
需要注意:
- 一屏显示多个ViewPager的子Item 主要是
android:clipChildren="false"
RelativeLayout和ViewPager都要设置否则没有效果。
关于这个问题详情见我另一篇博客
http://blog.csdn.net/codenoodles/article/details/50991793
那么下步就要写一下viewpager对应的item
先上代码:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:background="@drawable/shape_bg_item">
<!-- 设置参照物 -->
<View
android:id="@+id/strut"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_centerVertical="true"/>
<com.upc.viewpagerGallery.View.RoundImageView
android:id="@+id/iv_title_pic"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignBottom="@+id/strut"
android:layout_alignParentTop="true"
android:src="@drawable/expert_default"
app:type="round"/>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentBottom="true"
android:layout_alignTop="@+id/strut"
android:layout_below="@+id/iv_title_pic"
android:background="#fff"
android:orientation="vertical"
android:paddingTop="45dp">
<TextView
android:id="@+id/tv_exper_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:ellipsize="end"
android:paddingBottom="30dp"
android:singleLine="true"
android:text="Web前端工程师"
android:textColor="@android:color/black"
android:textSize="20sp"
android:typeface="sans"/>
<View
android:id="@+id/v_line"
android:layout_width="match_parent"
android:layout_height="1dp"
android:layout_below="@+id/tv_exper_name"
android:background="#a000"/>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/v_line"
android:layout_centerHorizontal="true"
android:gravity="center"
android:orientation="horizontal"
android:paddingTop="60dp">
<TextView
android:id="@+id/tv_num"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="388"
android:textColor="#a000"
android:textSize="12sp"/>
<TextView
android:id="@+id/tv_string"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="人学习"
android:textColor="#a000"
android:textSize="12sp"/>
</LinearLayout>
</RelativeLayout>
</RelativeLayout>
需要注意的几点:
首先一个ImageView和底部的RelativeLayout平分布局空间。不要问我为啥不直接用LinearLayout的layout_weight我在前面讲圆角布局的时候提到过,没看过的朋友可以先去看一下
http://blog.csdn.net/codenoodles/article/details/50990646
当然,咱们在item里也用到了圆角布局,还不会写的同学也可以先去上边的链接看一下。显示职业的TextView和底部的View横线左右对齐,我的处理方式是在activity中根据textView的width动态设置View横线的宽度,后边会讲到。
学习人数的textview和显示”人学习” 的TextView整体居中问题。我用的一个LinearLayout包裹一下。(不要问为啥不用一个TextView,因为实际项目中肯定是从服务器过去数据的)
Activity逻辑
package com.upc.viewpagerGallery.Activity;
import android.annotation.TargetApi;
import android.app.Activity;
import android.os.Build;
import android.os.Bundle;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.view.WindowManager;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.TextView;
import com.upc.viewpagerGallery.R;
import java.util.LinkedList;
/**
* Created by Explorer on 2016/3/27.
*/
public class ViewPagerGalleryActivity extends Activity {
private ViewPager mViewPager;
private ImageView ivBgPic;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
setTranslucentStatus(true);
SystemBarTintManager tintManager = new SystemBarTintManager(this);
tintManager.setStatusBarTintEnabled(true);
tintManager.setStatusBarTintResource(R.color.statusbar_color);//通知栏所需颜色
}
setContentView(R.layout.main_activity);
initViews();
}
@TargetApi(19)
private void setTranslucentStatus(boolean on) {
Window win = getWindow();
WindowManager.LayoutParams winParams = win.getAttributes();
final int bits = WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS;
if (on) {
winParams.flags |= bits;
} else {
winParams.flags &= ~bits;
}
win.setAttributes(winParams);
}
private void initViews() {
mViewPager = (ViewPager) findViewById(R.id.vp_pager);
ivBgPic = (ImageView) findViewById(R.id.iv_bg_pic);
mViewPager.setOffscreenPageLimit(3);
mViewPager.setPageTransformer(true, new com.upc.viewpagerGallery.View.ZoomOutPageTransformer());
mViewPager.setPageMargin(getResources().getDimensionPixelSize(R.dimen.page_margin));
MyViewPagerAdapter mAdapter = new MyViewPagerAdapter();
mViewPager.setAdapter(mAdapter);
mViewPager.setOffscreenPageLimit(mAdapter.getCount());
}
/**
* Viewpager数据适配器
*/
class MyViewPagerAdapter extends PagerAdapter {
//view复用
private LinkedList<View> mViewCache = null;
public MyViewPagerAdapter() {
mViewCache = new LinkedList<>();
}
@Override
public int getCount() {
return 6;
}
@Override
public boolean isViewFromObject(View view, Object object) {
return view == object;
}
@Override
public Object instantiateItem(ViewGroup container, int position) {
ViewHolder holder = null;
View convertView = null;
if (mViewCache.size() == 0) {
convertView = View.inflate(ViewPagerGalleryActivity.this, R.layout.item_viewpager, null);
holder = new ViewHolder();
holder.ivPic = (ImageView) convertView.findViewById(R.id.iv_title_pic);
holder.tvName = (TextView) convertView.findViewById(R.id.tv_exper_name);
holder.tvNum = (TextView) convertView.findViewById(R.id.tv_num);
holder.vLine = convertView.findViewById(R.id.v_line);
convertView.setTag(holder);
} else {
convertView = mViewCache.removeFirst();
holder = (ViewHolder) convertView.getTag();
}
holder.ivPic.setImageResource(R.drawable.expert_default);
holder.tvName.setText("Android工程师");
holder.tvNum.setText("39179");
/* 动态设置view 横线 让它和上方的文字等宽*/
holder.tvName.measure(0, 0);//要先measure一下,否则获得的宽度是0
int measuredWidth = holder.tvName.getMeasuredWidth();
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(measuredWidth, 1);
params.addRule(RelativeLayout.BELOW, R.id.tv_exper_name);
params.addRule(RelativeLayout.CENTER_HORIZONTAL);
holder.vLine.setLayoutParams(params);
container.addView(convertView);
return convertView;
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView((View) object);
mViewCache.add((View) object);
}
//View复用
public final class ViewHolder {
public TextView tvName;
public TextView tvNum;
public ImageView ivPic;
public View vLine;
}
}
}
说明
用到了沉浸式状态栏,这里不再详细说明,有问题的可以看我另一篇讲沉浸状态栏的博文
http://blog.csdn.net/codenoodles/article/details/50636425处理前边说的TextView和View横线等宽的问题,动态设置View的宽度。(实际项目中文字长度肯定是不一样的,所以要这么做)
viewpage数据源。我这里写死了,大家用的话可以自己写数据源。
Adapter中用到了view复用,之后一篇博文我会专门讲。也很简单,大家应该一看就明白。viewpager的切换动画。详情见
http://blog.csdn.net/codenoodles/article/details/50991961
现在效果基本上和开始的效果图一样啦~~
先写到这里,之后我做一些调整,加上高斯模糊图再传demo 上来。
考虑了一下,还是先发一个Demo吧
http://download.csdn.net/detail/codenoodles/9473772
有问题的欢迎留言。推荐一下”Android开发经验交流群”(454430053),欢迎大家就加入