Android实现今日头条订阅频道效果

本文实例为大家分享了android仿今日头条订阅频道，供大家参考，具体内容如下

源码：android实现今日头条订阅频道

布局文件

<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.example.a2_.mainactivity">

<textview
  android:background="@android:color/holo_blue_dark"
  android:gravity="center_horizontal"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:text="已订阅频道" />

<com.example.a2_.mygridlayout
  android:id="@+id/gl1"
  android:columncount="4"
  android:layout_gravity="center_horizontal"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content">
</com.example.a2_.mygridlayout>

<textview
  android:gravity="center_horizontal"
  android:background="@android:color/darker_gray"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:text="未订阅频道" />

<com.example.a2_.mygridlayout
  android:columncount="4"
  android:id="@+id/gl2"
  android:layout_gravity="center_horizontal"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content">
</com.example.a2_.mygridlayout>
</linearlayout>

shape文件和选择器

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<corners android:radius="5dp"/>
<stroke android:color="#000"
  android:width="1dp"/>
</shape>

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<corners android:radius="5dp"/>
<stroke android:color="#ff0000"
  android:dashgap="1dp"
  android:dashwidth="3dp"
  android:width="1dp"/>
</shape>

自定义布局

package com.example.a2_;

import android.animation.layouttransition;
import android.content.context;
import android.graphics.color;
import android.graphics.rect;
import android.util.attributeset;
import android.view.dragevent;
import android.view.view;
import android.widget.gridlayout;
import android.widget.textview;

import java.util.arraylist;
import java.util.list;

/**
 * created by administrator on 2017.06.08.0008.
 */

public class mygridlayout extends gridlayout implements view.ondraglistener {

private onitemclicklistener listener;
private list<rect> rects;
private view dragitem = null;
private boolean dragable;

public mygridlayout(context context, attributeset attrs) {
  super(context, attrs);
  //添加动画
  setlayouttransition(new layouttransition());
  //舰艇拖拽事件
  setondraglistener(this);
}

//根据传递进来的数据,动态地添加控件
public void setdata(list<string> list) {
  for (int i = 0; i < list.size(); i++) {
    additem(list.get(i));
  }
}

public void additem(string s) {
  final textview textview = new textview(getcontext());
  textview.settext(s);
  textview.settextcolor(color.black);
  textview.setpadding(15, 5, 15, 5);
  //设置背景
  textview.setbackgroundresource(r.drawable.selector_item_bg);
  textview.settextsize(25);
  //将控件添加到页面中
  addview(textview);

  layoutparams layoutparams = (layoutparams) textview.getlayoutparams();
  //设置外边距
  layoutparams.setmargins(5, 5, 5, 5);

  //监听textview点击事件
  textview.setonclicklistener(new onclicklistener() {
    @override
    public void onclick(view v) {

      if (listener != null) {
        listener.onitemclick(v);
      }
    }
  });

  //监听控件的长按事件
  textview.setonlongclicklistener(new onlongclicklistener() {

    @override
    public boolean onlongclick(view v) {

      if (!dragable) {
        return true;
      }
      //把当前长按的控件变红,并且有虚线
      v.setbackgroundresource(r.drawable.selector_item_red_bg);
      //开始拖拽控件
      v.startdrag(null, new dragshadowbuilder(v), null, 0);
      dragitem = v;
      //获取所有空间的矩形区域
      getallrect();

      return true;
    }
  });
}

//获取所有的矩形区域
private void getallrect() {
  rects = new arraylist<>();
  for (int i = 0; i < getchildcount(); i++) {
    view view = getchildat(i);
    //获取每个控件的坐标点,并存在集合中
    rects.add(new rect(view.getleft(), view.gettop(), view.getright(), view.getbottom()));
  }
}

public void setonclicklistener(onitemclicklistener listener) {
  this.listener = listener;
}

@override
public boolean ondrag(view v, dragevent event) {

  if (!dragable) {
    return true;
  }

  switch (event.getaction()) {
    case dragevent.action_drag_started:
      system.out.println("action_drag_started");
      break;
    case dragevent.action_drag_entered:
      system.out.println("action_drag_entered");
      break;
    case dragevent.action_drag_exited:
      system.out.println("action_drag_exited");
      break;
    case dragevent.action_drag_location:
      system.out.println("action_drag_location");
      //拖拽移动时,位置发生变化
      //根据当前的位置,判断应该插入到哪个位置
      int dragitemindex = finddragitem(event);
      if (dragitemindex != -1 && dragitem != null && getchildat(dragitemindex) != dragitem) {
        //先删除原来的控件
        removeview(dragitem);
        //吧新的控件拖拽到新的位置
        addview(dragitem, dragitemindex);

      }
      break;
    case dragevent.action_drop:
      system.out.println("action_drop");
      break;
    case dragevent.action_drag_ended:
      system.out.println("action_drag_ended");

      if (dragitem != null) {
        dragitem.setbackgroundresource(r.drawable.selector_item_bg);
      }
      break;
  }
  return true;
}

private int finddragitem(dragevent event) {
  if (rects == null) {
    return -1;
  }
  for (int i = 0; i < rects.size(); i++) {
    //如果鼠标当前的坐标包含在某个控件的坐标内部,那就说明,当前在该空间内部
    if (rects.get(i).contains((int) event.getx(), (int) event.gety())) {
      return i;
    }
  }
  return -1;
}

public interface onitemclicklistener {
  void onitemclick(view v);
}

// 设置控件是否可以拖拽
public void setdragable(boolean dragable) {
  this.dragable = dragable;
}
}

核心代码

package com.example.a2_;

import android.app.activity;
import android.os.bundle;
import android.view.view;
import android.widget.linearlayout;
import android.widget.textview;

import java.util.arrays;
import java.util.list;

import butterknife.butterknife;
import butterknife.injectview;

public class mainactivity extends activity {


@injectview(r.id.gl1)
mygridlayout gl1;
@injectview(r.id.gl2)
mygridlayout gl2;
@injectview(r.id.activity_main)
linearlayout activitymain;
//创建已订阅和为订阅的集合
private list<string> select = arrays.aslist("北京", "中国", "国际", "体育", "生活", "旅游", "科技", "军事", "时尚", "财经", "育儿", "汽车");
private list<string> unselect = arrays.aslist("娱乐", "服饰", "音乐", "视频", "段子", "搞笑", "科学", "房产", "名站");

@override
protected void oncreate(bundle savedinstancestate) {
  super.oncreate(savedinstancestate);
  setcontentview(r.layout.activity_main);
  butterknife.inject(this);

  //初始化数据
  initdata();
}


private void initdata() {

  gl1.setdata(select);
  gl2.setdata(unselect);

  gl1.setdragable(true);

  //设置监听
  gl1.setonclicklistener(new mygridlayout.onitemclicklistener() {
    @override
    public void onitemclick(view v) {
      gl1.removeview(v);
      //设置中间人
      string s = ((textview) v).gettext().tostring();
      gl2.additem(s);
    }
  });

  gl2.setonclicklistener(new mygridlayout.onitemclicklistener() {
    @override
    public void onitemclick(view v) {
      gl2.removeview(v);
      //设置中间人
      string s = ((textview) v).gettext().tostring();
      gl1.additem(s);
    }
  });
}

}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。