模仿今日头条：频道管理

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:background="#CC3131"
android:id="@+id/title"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<Button
android:layout_width="30dp"
android:layout_height="30dp"
android:background="@drawable/fanhui"
android:layout_gravity="center"
/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="频道管理"
android:textColor="#fff"
android:gravity="center"
android:textSize="23sp"
android:padding="8dp"
/>
</LinearLayout>
<ScrollView
android:layout_below="@id/title"
android:layout_width="fill_parent"
android:layout_height="fill_parent">

<LinearLayout
android:id="@+id/subscribe_main_layout"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:paddingBottom="14.0dip">

<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="10.0dip"
android:layout_marginTop="14.0dip"
android:gravity="bottom"
android:orientation="horizontal">

<TextView
android:id="@+id/my_category_tip_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="我的频道"
android:textColor="#000"
android:textSize="15sp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:textColor="#000"
android:textSize="10dp"
android:text="单击增删频道，长按拖拽排序"
/>
</LinearLayout>

<View
android:id="@+id/seperate_line"
android:layout_width="match_parent"
android:layout_height="0.5dp"
android:layout_marginBottom="14.0dip"
android:layout_marginTop="10dp" />

<com.example.e.mytoutiao.MyGridView
android:id="@+id/userGridView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="14dip"
android:layout_marginRight="14dip"
android:gravity="center"
android:horizontalSpacing="14dip"
android:listSelector="@android:color/transparent"
android:numColumns="4"
android:scrollbars="vertical"
android:stretchMode="columnWidth"
android:verticalSpacing="14.0px" />

<View
android:id="@+id/seperate_line2"
android:layout_width="match_parent"
android:layout_height="0.5dp"
android:layout_marginTop="10dp" />

<TextView
android:id="@+id/more_category_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="14.0dip"
android:layout_marginLeft="10.0dip"
android:layout_marginTop="10dp"
android:text="更多频道"
android:textColor="#000"
android:textSize="13sp" />

<com.example.e.mytoutiao.MyGridView
android:id="@+id/otherGridView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="14dip"
android:layout_marginRight="14dip"
android:gravity="center"
android:horizontalSpacing="14dip"
android:listSelector="@android:color/transparent"
android:numColumns="4"
android:scrollbars="vertical"
android:stretchMode="columnWidth"
android:verticalSpacing="14.0px" />
</LinearLayout>
</ScrollView>

</RelativeLayout>

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package com.example.e.mytoutiao;

import android.graphics.Bitmap;
import android.os.Bundle;
import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.Animation;
import android.view.animation.AnimationSet;
import android.view.animation.TranslateAnimation;
import android.widget.AdapterView;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.List;

import adapter.OtherAdapter;

/**
* Created by e on 2017/6/22.
*/

public class PingDaoGuanLiActivity extends AppCompatActivity implements AdapterView.OnItemClickListener {
private MyGridView mUserGv, mOtherGv;
private List<String> mUserList = new ArrayList<>();
private List<String> mOtherList = new ArrayList<>();
private OtherAdapter mUserAdapter, mOtherAdapter;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.pingdao_guanli);
initView();
}

public void initView() {
mUserGv = (MyGridView) findViewById(R.id.userGridView);
mOtherGv = (MyGridView) findViewById(R.id.otherGridView);
mUserList.add("推荐");
mUserList.add("热点");
mUserList.add("上海");
mUserList.add("时尚");
mUserList.add("科技");
mUserList.add("体育");
mUserList.add("军事");
mUserList.add("财经");
mUserList.add("网络");
mOtherList.add("汽车");
mOtherList.add("房产");
mOtherList.add("社会");
mOtherList.add("情感");
mOtherList.add("女人");
mOtherList.add("旅游");
mOtherList.add("健康");
mOtherList.add("美女");
mOtherList.add("游戏");
mOtherList.add("数码");
mOtherList.add("娱乐");
mOtherList.add("探索");
mUserAdapter = new OtherAdapter(this, mUserList, true);
mOtherAdapter = new OtherAdapter(this, mOtherList, false);
mUserGv.setAdapter(mUserAdapter);
mOtherGv.setAdapter(mOtherAdapter);
mUserGv.setOnItemClickListener(this);
mOtherGv.setOnItemClickListener(this);
}

/**
* 获取点击的Item的对应View，
* 因为点击的Item已经有了自己归属的父容器MyGridView，所有我们要是有一个ImageView来代替Item移动
*
* @param view
* @return
*/
private ImageView getView(View view) {
view.destroyDrawingCache();
view.setDrawingCacheEnabled(true);
Bitmap cache = Bitmap.createBitmap(view.getDrawingCache());
view.setDrawingCacheEnabled(false);
ImageView iv = new ImageView(this);
iv.setImageBitmap(cache);
return iv;
}

/**
* 获取移动的VIEW，放入对应ViewGroup布局容器
*
* @param viewGroup
* @param view
* @param initLocation
* @return
*/
private View getMoveView(ViewGroup viewGroup, View view, int[] initLocation) {
int x = initLocation[0];
int y = initLocation[1];
viewGroup.addView(view);
LinearLayout.LayoutParams mLayoutParams = new LinearLayout.LayoutParams(
ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
mLayoutParams.leftMargin = x;
mLayoutParams.topMargin = y;
view.setLayoutParams(mLayoutParams);
return view;
}

/**
* 创建移动的ITEM对应的ViewGroup布局容器
* 用于存放我们移动的View
*/
private ViewGroup getMoveViewGroup() {
//window中最顶层的view
ViewGroup moveViewGroup = (ViewGroup) getWindow().getDecorView();
LinearLayout moveLinearLayout = new LinearLayout(this);
moveLinearLayout.setLayoutParams(new LinearLayout.LayoutParams(
ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
moveViewGroup.addView(moveLinearLayout);
return moveLinearLayout;
}

/**
* 点击ITEM移动动画
*
* @param moveView
* @param startLocation
* @param endLocation
* @param moveChannel
* @param clickGridView
*/
private void MoveAnim(View moveView, int[] startLocation, int[] endLocation, final String moveChannel,
final GridView clickGridView, final boolean isUser) {
int[] initLocation = new int[2];
//获取传递过来的VIEW的坐标
moveView.getLocationInWindow(initLocation);
//得到要移动的VIEW,并放入对应的容器中
final ViewGroup moveViewGroup = getMoveViewGroup();
final View mMoveView = getMoveView(moveViewGroup, moveView, initLocation);
//创建移动动画
TranslateAnimation moveAnimation = new TranslateAnimation(
startLocation[0], endLocation[0], startLocation[1],
endLocation[1]);
moveAnimation.setDuration(300L);//动画时间
//动画配置
AnimationSet moveAnimationSet = new AnimationSet(true);
moveAnimationSet.setFillAfter(false);//动画效果执行完毕后，View对象不保留在终止的位置
moveAnimationSet.addAnimation(moveAnimation);
mMoveView.startAnimation(moveAnimationSet);
moveAnimationSet.setAnimationListener(new Animation.AnimationListener() {

@Override
public void onAnimationStart(Animation animation) {
}

@Override
public void onAnimationRepeat(Animation animation) {
}

@Override
public void onAnimationEnd(Animation animation) {
moveViewGroup.removeView(mMoveView);
// 判断点击的是DragGrid还是OtherGridView
if (isUser) {
mOtherAdapter.setVisible(true);
mOtherAdapter.notifyDataSetChanged();
mUserAdapter.remove();
} else {
mUserAdapter.setVisible(true);
mUserAdapter.notifyDataSetChanged();
mOtherAdapter.remove();
}
}
});
}

@Override
public void onItemClick(AdapterView<?> parent, View view, final int position, long id) {
switch (parent.getId()) {
case R.id.userGridView:
//position为 0，1 的不可以进行任何操作
if (position != 0 && position != 1) {
final ImageView moveImageView = getView(view);
if (moveImageView != null) {
TextView newTextView = (TextView) view.findViewById(R.id.text_item);
final int[] startLocation = new int[2];
newTextView.getLocationInWindow(startLocation);
final String channel = ((OtherAdapter) parent.getAdapter()).getItem(position);//获取点击的频道内容
mOtherAdapter.setVisible(false);
//添加到最后一个
mOtherAdapter.addItem(channel);
new Handler().postDelayed(new Runnable() {
public void run() {
try {
int[] endLocation = new int[2];
//获取终点的坐标
mOtherGv.getChildAt(mOtherGv.getLastVisiblePosition()).getLocationInWindow(endLocation);
MoveAnim(moveImageView, startLocation, endLocation, channel, mUserGv, true);
mUserAdapter.setRemove(position);
} catch (Exception localException) {
}
}
}, 50L);
}
}
break;
case R.id.otherGridView:
final ImageView moveImageView = getView(view);
if (moveImageView != null) {
TextView newTextView = (TextView) view.findViewById(R.id.text_item);
final int[] startLocation = new int[2];
newTextView.getLocationInWindow(startLocation);
final String channel = ((OtherAdapter) parent.getAdapter()).getItem(position);
mUserAdapter.setVisible(false);
//添加到最后一个
mUserAdapter.addItem(channel);
new Handler().postDelayed(new Runnable() {
public void run() {
try {
int[] endLocation = new int[2];
//获取终点的坐标
mUserGv.getChildAt(mUserGv.getLastVisiblePosition()).getLocationInWindow(endLocation);
MoveAnim(moveImageView, startLocation, endLocation, channel, mOtherGv, false);
mOtherAdapter.setRemove(position);
} catch (Exception localException) {
}
}
}, 50L);
}
break;
default:
break;
}
}
}

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package adapter;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

import com.example.e.mytoutiao.R;

import java.util.List;

/**
* Created by e on 2017/6/22.
*/

public class OtherAdapter extends BaseAdapter {

private Context context;
public List<String> channelList;
private TextView item_text;
/** 是否可见 在移动动画完毕之前不可见，动画完毕后可见*/
boolean isVisible = true;
/** 要删除的position */
public int remove_position = -1;
/** 是否是用户频道 */
private boolean isUser = false;

public OtherAdapter(Context context, List<String> channelList ,boolean isUser) {
this.context = context;
this.channelList = channelList;
this.isUser = isUser;
}

@Override
public int getCount() {
return channelList == null ? 0 : channelList.size();
}

@Override
public String getItem(int position) {
if (channelList != null && channelList.size() != 0) {
return channelList.get(position);
}
return null;
}

@Override
public long getItemId(int position) {
return position;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
View view = LayoutInflater.from(context).inflate(R.layout.adapter_mygridview_item, null);
item_text = (TextView) view.findViewById(R.id.text_item);
String channel = getItem(position);
item_text.setText(channel);
if(isUser){
if ((position == 0) || (position == 1)){
item_text.setEnabled(false);
}
}
if (!isVisible && (position == -1 + channelList.size())){
item_text.setText("");
item_text.setSelected(true);
item_text.setEnabled(true);
}
if(remove_position == position){
item_text.setText("");
}
return view;
}

/** 获取频道列表 */
public List<String> getChannnelLst() {
return channelList;
}

/** 添加频道列表 */
public void addItem(String channel) {
channelList.add(channel);
notifyDataSetChanged();
}

/** 设置删除的position */
public void setRemove(int position) {
remove_position = position;
notifyDataSetChanged();
// notifyDataSetChanged();
}

/** 删除频道列表 */
public void remove() {
channelList.remove(remove_position);
remove_position = -1;
notifyDataSetChanged();
}
/** 设置频道列表 */
public void setListDate(List<String> list) {
channelList = list;
}

/** 获取是否可见 */
public boolean isVisible() {
return isVisible;
}

/** 设置是否可见 */
public void setVisible(boolean visible) {
isVisible = visible;
}
}

package com.example.e.mytoutiao;

import android.content.Context;
import android.util.AttributeSet;
import android.widget.GridView;

/**
* Created by e on 2017/6/22.
*/

public class MyGridView extends GridView{
public MyGridView(Context paramContext, AttributeSet paramAttributeSet) {
super(paramContext, paramAttributeSet);
}

@Override
public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int expandSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2,
MeasureSpec.AT_MOST);
super.onMeasure(widthMeasureSpec, expandSpec);
}
}