Android realizes today's headline subscription channel effect

In this article, we share the Android subscription channel imitating today's headlines for your reference. The specific contents are as follows

Source code: Android realizes today's headline subscription channel

Layout file

<?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=" Subscribed channel " />

<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=" Unsubscribed channel " />

<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 Files and Selectors

<?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>

Custom layout

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);
  // Add Animation 
  setLayoutTransition(new LayoutTransition());
  // Ship towing incident 
  setOnDragListener(this);
}

// According to the data passed in, , Adding controls dynamically 
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);
  // Setting Background 
  textView.setBackgroundResource(R.drawable.selector_item_bg);
  textView.setTextSize(25);
  // Add controls to the page 
  addView(textView);

  LayoutParams layoutParams = (LayoutParams) textView.getLayoutParams();
  // Set outer margins 
  layoutParams.setMargins(5, 5, 5, 5);

  // Eavesdropping textview Click event 
  textView.setOnClickListener(new OnClickListener() {
    @Override
    public void onClick(View v) {

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

  // Listening for long press events of controls 
  textView.setOnLongClickListener(new OnLongClickListener() {

    @Override
    public boolean onLongClick(View v) {

      if (!dragable) {
        return true;
      }
      // Turns the currently long-pressed control red , And there is a dotted line 
      v.setBackgroundResource(R.drawable.selector_item_red_bg);
      // Start dragging and dropping controls 
      v.startDrag(null, new DragShadowBuilder(v), null, 0);
      DragItem = v;
      // Gets the rectangular region of all spaces 
      getAllRect();

      return true;
    }
  });
}

// Get all rectangular areas 
private void getAllRect() {
  rects = new ArrayList<>();
  for (int i = 0; i < getChildCount(); i++) {
    View view = getChildAt(i);
    // Gets the coordinate points of each control , And exists in the collection 
    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");
      // When dragging and moving, , Change of position 
      // Depending on the current location , Determine where to insert 
      int dragItemIndex = findDragItem(event);
      if (dragItemIndex != -1 && DragItem != null && getChildAt(dragItemIndex) != DragItem) {
        // Delete the original control first 
        removeView(DragItem);
        // Drag and drop new controls to new locations 
        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++) {
    // If the current coordinates of the mouse are contained within the coordinates of a control , That means that , Is currently inside the space 
    if (rects.get(i).contains((int) event.getX(), (int) event.getY())) {
      return i;
    }
  }
  return -1;
}

public interface OnItemClickListener {
  void onItemClick(View v);
}

//  Sets whether the control can be dragged 
public void setDragable(boolean dragable) {
  this.dragable = dragable;
}
}

Core code

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;
// Creating Subscribed and Subscribed Collections 
private List<String> select = Arrays.asList(" Beijing ", " China ", " International ", " Sports ", " Life ", " Tourism ", " Science and technology ", " Military ", " Fashion ", " Finance and Economics ", " Parenting ", " Automobile ");
private List<String> unselect = Arrays.asList(" Entertainment ", " Clothing ", " Music ", " Video ", " Jokes ", " Funny ", " Science ", " Real estate ", " Famous station ");

@Override
protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  ButterKnife.inject(this);

  // Initialization data 
  initData();
}


private void initData() {

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

  gl1.setDragable(true);

  // Set up listening 
  gl1.setOnClickListener(new MyGridLayout.OnItemClickListener() {
    @Override
    public void onItemClick(View v) {
      gl1.removeView(v);
      // Set up a middleman 
      String s = ((TextView) v).getText().toString();
      gl2.addItem(s);
    }
  });

  gl2.setOnClickListener(new MyGridLayout.OnItemClickListener() {
    @Override
    public void onItemClick(View v) {
      gl2.removeView(v);
      // Set up a middleman 
      String s = ((TextView) v).getText().toString();
      gl1.addItem(s);
    }
  });
}

}