Android--自定义控件---自动分页的GridView

最近，根据项目需求，需要一个能够自动分页的导航，所以便自定义了一个自动分页的GridView。

思路：继承RelativeLayout，然后在里面放了一个viewpager和一个GridView。。。我也不会说，还是直接上代码吧

先看看你效果图，分别是2行3列和1行3列（有自定义属性，可以自己定义几行几列）

接下来直接看源代码(很简单)

  1 package custom.widget;
  2 
  3 import android.annotation.TargetApi;
  4 import android.content.Context;
  5 import android.content.res.TypedArray;
  6 import android.os.Build;
  7 import android.support.v4.view.PagerAdapter;
  8 import android.support.v4.view.ViewPager;
  9 import android.util.AttributeSet;
 10 import android.view.MotionEvent;
 11 import android.view.View;
 12 import android.view.ViewGroup;
 13 import android.widget.AbsListView;
 14 import android.widget.AdapterView;
 15 import android.widget.BaseAdapter;
 16 import android.widget.GridView;
 17 import android.widget.LinearLayout;
 18 import android.widget.RadioButton;
 19 import android.widget.RadioGroup;
 20 import android.widget.RelativeLayout;
 21 
 22 import com.newair.automaticpagedemo.R;
 23 
 24 import java.util.ArrayList;
 25 import java.util.List;
 26 
 27 /**
 28  * Created by ouhimehime on 16/5/4.
 29  * ----------自动分页的GridView----------
 30  */
 31 public class AutoMaticPageGridView extends RelativeLayout {
 32 
 33     //分页所用
 34     private ViewPager viewPager;
 35     //导航点
 36     private RadioGroup radioGroup;
 37     //自定义行数
 38     private int lines = 0;
 39     //自定义列数
 40     private int column = 0;
 41     //自定义按钮样式
 42     private int btn_res;
 43     //自定义属性是否显示导航点
 44     private boolean btn_isvisible;
 45     //页数-需要动态计算
 46     private int pages = 0;
 47     //适配器
 48     private BaseAutoAdapter adapter;
 49     //Item的高度
 50     private int itemHeight = 0;
 51 
 52     //点击事件的接口
 53     public interface OnItemClickCallBack {
 54         void OnItemClicked(int position, Object object);
 55     }
 56 
 57     private OnItemClickCallBack onItemClickCallBack;
 58 
 59     public void setOnItemClickListener(OnItemClickCallBack onItemClickCallBack) {
 60         this.onItemClickCallBack = onItemClickCallBack;
 61     }
 62 
 63 
 64     public AutoMaticPageGridView(Context context) {
 65         super(context);
 66     }
 67 
 68     public AutoMaticPageGridView(Context context, AttributeSet attrs) {
 69         super(context, attrs);
 70         init(context, attrs);
 71     }
 72 
 73     public AutoMaticPageGridView(Context context, AttributeSet attrs, int defStyleAttr) {
 74         super(context, attrs, defStyleAttr);
 75         init(context, attrs);
 76     }
 77 
 78     @TargetApi(Build.VERSION_CODES.LOLLIPOP)
 79     public AutoMaticPageGridView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
 80         super(context, attrs, defStyleAttr, defStyleRes);
 81         init(context, attrs);
 82     }
 83 
 84 
 85     //初始化控件
 86     private void init(Context context, AttributeSet attrs) {
 87         //加载自定义属性
 88         final TypedArray array = context.obtainStyledAttributes(attrs, R.styleable.AutoMaticPageGridView);
 89         lines = array.getInteger(R.styleable.AutoMaticPageGridView_auto_lines, 1);//行数
 90         column = array.getInteger(R.styleable.AutoMaticPageGridView_auto_column, 4);//列数
 91         btn_res = array.getResourceId(R.styleable.AutoMaticPageGridView_auto_button, 0);//btn的样式
 92         btn_isvisible = array.getBoolean(R.styleable.AutoMaticPageGridView_auto_button_visible, true);//默认true
 93         array.recycle();
 94         //分页用
 95         viewPager = new ViewPager(context);
 96         viewPager.setLayoutParams(new LayoutParams(RelativeLayout.LayoutParams.MATCH_PARENT,
 97                 RelativeLayout.LayoutParams.MATCH_PARENT));
 98         addView(viewPager);
 99         //导航点用
100         radioGroup = new RadioGroup(context);
101         radioGroup.setOrientation(LinearLayout.HORIZONTAL);
102         RelativeLayout.LayoutParams params = new LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
103         params.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);
104         params.addRule(RelativeLayout.CENTER_IN_PARENT);
105         radioGroup.setLayoutParams(params);
106         addView(radioGroup);
107         //如果不显示的话就隐藏
108         if (!btn_isvisible) {
109             radioGroup.setVisibility(GONE);
110         }
111     }
112 
113     //设置适配器
114     public void setAdapter(BaseAutoAdapter baseAdapter) {
115         this.adapter = baseAdapter;
116         //计算页数
117         if ((adapter.getCounts() / (column * lines)) > 0) {
118             pages = (adapter.getCounts() / (column * lines)) + 1; //多一页
119         } else {
120             pages = adapter.getCounts();
121         }
122         //添加radioButton
123         addRadioButton(pages);
124         this.post(new Runnable() {
125             @Override
126             public void run() {
127                 itemHeight = getMeasuredHeight() / lines;
128                 //显示viewpager
129                 ViewPagerAdapter viewPagerAdapter = new ViewPagerAdapter(getContext());
130                 viewPager.setAdapter(viewPagerAdapter);
131                 //设置联动
132                 initLinkAgeEvent();
133             }
134         });
135     }
136 
137     //添加RadioButton
138     private void addRadioButton(int pages) {
139         for (int i = 0; i < pages; i++) {
140             RadioButton radioButton = new RadioButton(getContext());
141             radioButton.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,
142                     LinearLayout.LayoutParams.WRAP_CONTENT));
143             radioButton.setPadding(5, 5, 5, 5);//间距
144             radioButton.setId(i);//设置Id,方便联动
145             radioButton.setClickable(false);
146             if (btn_res != 0) {  //设置按钮样式
147                 radioButton.setButtonDrawable(btn_res);
148             }
149             radioGroup.addView(radioButton);
150         }
151     }
152 
153     //给当前页计算数据数量
154     private List<View> getAdapterData(int position) {
155         List<View> cerrent = new ArrayList<>();
156         if (position == pages - 1) { //如果等于最后一页
157             for (int i = position * (lines * column); i < adapter.getCounts(); i++) {
158                 cerrent.add(adapter.getItemView(i, null));
159             }
160         } else {
161             for (int i = position * (lines * column); i < position * (lines * column) + (lines * column); i++) {
162                 cerrent.add(adapter.getItemView(i, null));
163             }
164         }
165         return cerrent;
166     }
167 
168     //ViewPager适配器
169     private class ViewPagerAdapter extends PagerAdapter {
170 
171         private Context context;
172 
173         public ViewPagerAdapter(Context context) {
174             this.context = context;
175         }
176 
177         @Override
178         public int getCount() {
179             return pages;
180         }
181 
182         @Override
183         public boolean isViewFromObject(View view, Object object) {
184             return view == object;
185         }
186 
187         @Override
188         public Object instantiateItem(ViewGroup container, int position) {
189             CustomGridView gridView = new CustomGridView(context);
190             gridView.setLayoutParams(new AbsListView.LayoutParams(AbsListView.LayoutParams.MATCH_PARENT,
191                     AbsListView.LayoutParams.MATCH_PARENT));
192             gridView.setNumColumns(column);//设置列数
193             gridView.setColumnWidth(GridView.AUTO_FIT);
194             GridViewAdapter adapter = new GridViewAdapter(getAdapterData(position), position);
195             gridView.setAdapter(adapter);
196             container.addView(gridView);
197             gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
198                 @Override
199                 public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
200                     GridViewAdapter adapter1 = (GridViewAdapter) parent.getAdapter();
201                     onItemClickCallBack.OnItemClicked(adapter1.currentPage * (lines * column) + position, view);
202                 }
203             });
204             return gridView;
205         }
206 
207         @Override
208         public void destroyItem(ViewGroup container, int position, Object object) {
209             container.removeView((GridView) object);
210         }
211     }
212 
213     //GridView的适配器
214     private class GridViewAdapter extends BaseAdapter {
215 
216         private List<View> views;//数据量
217         public int currentPage; //当前页
218 
219         public GridViewAdapter(List<View> counts, int currentPage) {
220             this.views = counts;
221             this.currentPage = currentPage;
222         }
223 
224         @Override
225         public int getCount() {
226             return views.size();
227         }
228 
229         @Override
230         public Object getItem(int position) {
231             return position;
232         }
233 
234         @Override
235         public long getItemId(int position) {
236             return position;
237         }
238 
239         @Override
240         public View getView(int position, View convertView, ViewGroup parent) {
241             if (convertView == null) {
242                 convertView = views.get(position);
243                 convertView.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, itemHeight));
244             }
245             return convertView;
246         }
247 
248     }
249 
250     //自定义GridView,禁止滑动
251     private class CustomGridView extends GridView {
252 
253         public CustomGridView(Context context) {
254             super(context);
255         }
256 
257         public CustomGridView(Context context, AttributeSet attrs) {
258             super(context, attrs);
259         }
260 
261         public CustomGridView(Context context, AttributeSet attrs, int defStyleAttr) {
262             super(context, attrs, defStyleAttr);
263         }
264 
265         @TargetApi(Build.VERSION_CODES.LOLLIPOP)
266         public CustomGridView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
267             super(context, attrs, defStyleAttr, defStyleRes);
268         }
269 
270         @Override
271         public boolean dispatchTouchEvent(MotionEvent ev) {
272             if (ev.getAction() == MotionEvent.ACTION_MOVE) {
273                 return true;//禁止GridView进行滑动
274             }
275             return super.dispatchTouchEvent(ev);
276         }
277     }
278 
279     //初始化联动联动事件
280     private void initLinkAgeEvent() {
281         //默认选中第一个
282         viewPager.setCurrentItem(0);
283         radioGroup.check(radioGroup.getChildAt(0).getId());
284         //滑动换页事件
285         viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
286             @Override
287             public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
288 
289             }
290 
291             @Override
292             public void onPageSelected(int position) {
293                 radioGroup.check(position);
294             }
295 
296             @Override
297             public void onPageScrollStateChanged(int state) {
298 
299             }
300         });
301     }
302 
303 }

这个组件也有个适配器，很简单，就是定义了几个抽象方法

package custom.widget;

import android.view.View;
import android.view.ViewGroup;

/**
 * Created by ouhimehime on 16/5/4.
 * -----适配器=------
 */
public abstract class BaseAutoAdapter {


    public abstract int getCounts(); //返回数据数量

    public abstract Object getItem(int position); //当前Item的数据

    public abstract View getItemView(int position, ViewGroup parent); //返回Item的布局


}

还自定义了一部分属性，方便使用起来好控制

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <declare-styleable name="AutoMaticPageGridView">
        <!-- 行数 -->
        <attr name="auto_lines" format="integer" />
        <!-- 列数 -->
        <attr name="auto_column" format="integer" />
        <!-- button的样式 -->
        <attr name="auto_button" format="reference" />
        <!-- 是否显示导航点 -->
        <attr name="auto_button_visible" format="boolean" />
    </declare-styleable>
</resources>

-----------------------------------------------------------------------以上就是源代码了-----------------------------------------------------------------------------

下面是如何使用：（就当做一个控件来使用就可以）

①、先看布局文件XML,控件的高度是可以自己定义的

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:auto="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <custom.widget.AutoMaticPageGridView
        android:id="@+id/automatic"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        auto:auto_button="@drawable/btn_status_style"
        auto:auto_column="3"
        auto:auto_lines="2" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="2"/>

</LinearLayout>

②、再看适配器代码，适配器需要继承BaseAutoAdapter

package adapter;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import com.newair.automaticpagedemo.R;

import java.util.List;

import custom.widget.BaseAutoAdapter;

/**
 * Created by ouhimehime on 16/5/4.
 * ------------适配器------------
 */
public class MyAutoMaticPageAdapter extends BaseAutoAdapter {

    private Context context;
    private List<Integer> myData;

    public MyAutoMaticPageAdapter(Context context, List<Integer> myData) {
        this.context = context;
        this.myData = myData;
    }

    @Override
    public int getCounts() {
        return myData.size();
    }

    @Override
    public Object getItem(int position) {
        return myData.get(position);
    }

    @Override
    public View getItemView(int position, ViewGroup parent) {
        View view = LayoutInflater.from(context).inflate(R.layout.item_layout, null);

        return view;
    }

}

③、再看主布局代码，为了方便我就随便放了放了10条数据

package com.newair.automaticpagedemo;

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

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

import adapter.MyAutoMaticPageAdapter;
import custom.widget.AutoMaticPageGridView;

public class MainActivity extends AppCompatActivity {

    private AutoMaticPageGridView automatic;
    private MyAutoMaticPageAdapter adapter;
    private List<Integer> myData;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        automatic = (AutoMaticPageGridView) findViewById(R.id.automatic);
        myData = new ArrayList<>();
        for (int i = 0; i < 10; i++) {
            myData.add(i);
        }

        adapter = new MyAutoMaticPageAdapter(this, myData);
        automatic.setAdapter(adapter);
        //点击事件
        automatic.setOnItemClickListener(new AutoMaticPageGridView.OnItemClickCallBack() {
            @Override
            public void OnItemClicked(int position, Object object) {
                Toast.makeText(MainActivity.this, position + "--", Toast.LENGTH_SHORT).show();
            }
        });
    }
}

------------------------------------------------------------------------以上是如何使用----------------------------------------------------------------------------------

以上就是自己定义了一个自动分页的控件，写的不好，希望各位见谅。

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原文地址：https://www.cnblogs.com/819158327fan/p/5461111.html