Android 自定义GridLayout实现频道管理

前言

以前总是在CSDN上看各位前辈的精彩博客,从中也学习了很多东西。其实自己也一直想写博客,直到今天终于要踏出这一步了,有点小兴奋,哈哈!不足之处,还请各位同仁不吝赐教,拜谢!!!

话不多说,工作中我们时常会遇到频道管理的需求,不少博客使用GridView实现这一功能,个人喜欢用自定义的GridLayout实现,萝卜白菜各有所爱,嘿嘿。

功能


要实现的功能如上图所示(当然,左边只是一个参考,这里界面不是重点,我们要实现这个功能)

1.   分上下两部分

2.我的频道实现了长按拖拽排序功能;同时,点击某一子条目时,将该条目从“我的频道”中删除,添加到“更多频道”中。

3.更多频道实现了点击事件,当点击某一子条目时,该子条目从更多频道中删除,添加到我的频道”中

实现代码

主程序代码:

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.TextView;

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

public class MainActivity extends AppCompatActivity {

    private DragGridLayout showGridLayout;
    private DragGridLayout hideGridLayout;

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

    private void initCustom() {
        showGridLayout = (DragGridLayout) findViewById(R.id.dgl_main_show);
        showGridLayout.setResource(R.drawable.selector_textbg, 10, 5);
        showGridLayout.setEnableDrag(true);
        List<String> items = new ArrayList<>();
        items.add("推荐");
        items.add("本地事");
        items.add("本地人");
        items.add("社区");
        items.add("图集");
        items.add("要闻");
        items.add("热点");
        items.add("旅游");
        items.add("健康");
        showGridLayout.setItems(items);
        hideGridLayout = (DragGridLayout) findViewById(R.id.dgl_main_bottom);
        hideGridLayout.setEnableDrag(false);
        hideGridLayout.setResource(R.drawable.selector_textbg, 10, 5);
        List<String> items1 = new ArrayList<>();
        items1.add("家居");
        items1.add("奇石");
        items1.add("螺蛳粉");
        items1.add("情感");
        items1.add("文化");
        items1.add("体育");
        items1.add("汽车");
        items1.add("本地号");
        items1.add("爆料");
        items1.add("时政");
        items1.add("美女");
        items1.add("公益");
        items1.add("公民榜样");
        items1.add("亲子");
        items1.add("社会");
        items1.add("舌尖柳州");
        items1.add("开心一刻");
        items1.add("居柳州");
        hideGridLayout.setItems(items1);

        //设置点击事件
        showGridLayout.setOnItemClickListener(new DragGridLayout.OnItemClickListener() {
            @Override
            public void onItemClick(TextView tv) {
                //当点击时,将返回的TextView从showGridLayout容器中删除,在添加到hideGridLayout中
                showGridLayout.removeView(tv);
                hideGridLayout.addItem(tv.getText().toString());
            }
        });

        hideGridLayout.setOnItemClickListener(new DragGridLayout.OnItemClickListener() {
            @Override
            public void onItemClick(TextView tv) {
                hideGridLayout.removeView(tv);
                showGridLayout.addItem(tv.getText().toString());
            }
        });


    }

}

布局:

<?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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@color/colorPry"
            android:text="点击增删频道,长按拖拽排序"/>

        <com.example.customview.DragGridLayout
            android:id="@+id/dgl_main_show"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

        </com.example.customview.DragGridLayout>

    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@color/colorPry"
            android:text="频道管理"/>

        <com.example.customview.DragGridLayout
            android:id="@+id/dgl_main_bottom"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

        </com.example.customview.DragGridLayout>
        
    </LinearLayout>

</LinearLayout>
自定义GridLayout:

注释比较详细了,直接上代码,其中的一些参数,例如margin和padding,可根据项目需求,具体定制。

import android.animation.LayoutTransition;
import android.content.Context;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.view.DragEvent;
import android.view.Gravity;
import android.view.View;
import android.widget.GridLayout;
import android.widget.TextView;

import java.util.List;

/**
 * Created by ZLM on 2017/4/3.
 */

public class DragGridLayout extends GridLayout {

    private boolean ableDrag;
    private Rect[] rects;
    private View dragView;
    private OnItemClickListener itemClickListener;

    //拖拽监听
    private View.OnDragListener odl = new View.OnDragListener() {
        @Override
        public boolean onDrag(View view, DragEvent dragEvent) {
            switch (dragEvent.getAction()) {
                case DragEvent.ACTION_DRAG_STARTED:
                    //当拖拽事件产生时,给每个子控件创建出对应的矩形
                    initRects();
                    break;
                case DragEvent.ACTION_DRAG_LOCATION:
                    //当手指移动时,判断当前进入了哪一个子控件范围内,并返回对应子控件的索引
                    int touchIndex = getTouchIndex(dragEvent);
                    if (touchIndex > -1 && dragView != null && dragView != DragGridLayout.this.getChildAt(touchIndex)) {
                        //先把拖拽的view从当前位置删除,再添加到touchIndex上
                        DragGridLayout.this.removeView(dragView);
                        DragGridLayout.this.addView(dragView, touchIndex);
                    }
                    break;
                case DragEvent.ACTION_DRAG_ENDED:
                    if (dragView != null) {
                        dragView.setEnabled(true);
                    }
                    break;
                default:
                    break;
            }
            return true;
        }
    };
    //长按监听
    private View.OnLongClickListener olcl = new View.OnLongClickListener() {
        @Override
        public boolean onLongClick(View view) {
            //长按事件发生时,即给dragView赋值
            dragView = view;
            //拖拽事件
            view.startDrag(null, new View.DragShadowBuilder(view), null, 0);
            view.setEnabled(false);
            return false;
        }
    };


    private int getTouchIndex(DragEvent dragEvent) {
        for (int i = 0; i < rects.length; i++) {
            Rect rect = rects[i];
            if (rect.contains((int) dragEvent.getX(), (int) dragEvent.getY())) {
                return i;
            }
        }
        return -1;
    }

    //创建子控件对应的矩形
    private void initRects() {
        //给容器中的每一个子控件都新建一个矩形
        rects = new Rect[getChildCount()];
        for (int i = 0; i < getChildCount(); i++) {
            View childAt = getChildAt(i);
            rects[i] = new Rect(childAt.getLeft(), childAt.getTop(), childAt.getRight(), childAt.getBottom());
        }
    }

    public DragGridLayout(Context context) {
        this(context, null);
    }

    public DragGridLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
        setColumnCount(4);
        setLayoutTransition(new LayoutTransition());
    }

    //定义方法,由外部传递一个栏目的数据集合进来,在这里根据数据集合动态创建表格界面
    public void setItems(List<String> items) {
        for (String item : items) {
            addItem(item);
        }
    }

    //定义方法,设置是否允许拖拽
    public void setEnableDrag(boolean EnableDrag) {
        ableDrag = EnableDrag;
        if (ableDrag) {
            setOnDragListener(odl);
        } else {
            setOnDragListener(null);
        }
    }

    //定义接口回调
    public interface OnItemClickListener {
        public void onItemClick(TextView tv);
    }

    public void setOnItemClickListener(OnItemClickListener listener) {
        this.itemClickListener = listener;
    }

    public void addItem(String item) {
        TextView tv = getNewTextView();
        tv.setText(item);
        this.addView(tv);
    }

    //定义方法,外部传入子条目的背景资源Id,外边距margin(px),tv内边距padding(px)
    private final float scale = getContext().getResources().getDisplayMetrics().density;
    private int resId;
    private int margin;
    private int padding;

    public void setResource(int ResourceId, int margin, int padding) {
        this.resId = ResourceId;
        this.margin = (int) (margin * scale + 0.5f);
        this.padding = (int) (padding * scale + 0.5f);
    }


    public TextView getNewTextView() {

        GridLayout.LayoutParams layoutParams = new GridLayout.LayoutParams();
        layoutParams.width = getResources().getDisplayMetrics().widthPixels / 4 - 2 * margin;
        layoutParams.height = GridLayout.LayoutParams.WRAP_CONTENT;
        layoutParams.setMargins(margin, margin, margin, margin);

        TextView tv = new TextView(getContext());
        tv.setLayoutParams(layoutParams);
        tv.setGravity(Gravity.CENTER);
        tv.setBackgroundResource(resId);
        tv.setPadding(padding, padding, padding, padding);

        if (ableDrag) {
            tv.setOnLongClickListener(olcl);
        } else {
            tv.setOnLongClickListener(null);
        }

        tv.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View view) {
                if (itemClickListener != null) {
                    itemClickListener.onItemClick((TextView) view);
                }
            }
        });
        return tv;
    }
}
drawable/selector_textbg.xml:

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_enabled="true" android:drawable="@drawable/shape_textbg_nomal"/>
    <item android:state_enabled="false" android:drawable="@drawable/shape_textbg_pressed"/>

</selector>
drawable/shape_textbg_nomal.xml:

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <stroke android:width="1dp" android:color="@color/colorBlack"/>
    <corners android:radius="@dimen/dp8"/>
    <solid android:color="@color/colorWhite"/>
</shape>
drawable/shape_textbg_pressed.xml:

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <stroke android:width="1dp"
            android:dashWidth="2dp"
            android:dashGap="3dp"
            android:color="@color/colorRed"/>
    <corners android:radius="@dimen/dp8"/>
    <solid android:color="@color/colorWhite"/>
</shape>


發表評論
所有評論
還沒有人評論,想成為第一個評論的人麼? 請在上方評論欄輸入並且點擊發布.
相關文章