[移动开发]Android 简单封装个分页选择器

利用了RecyclerView来滑动选择，封装在了group里

JAVA：

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.support.annotation.Nullable;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;

import com.example.outsite.R;

public class PageChangeList extends ViewGroup {
    private int total=0,pages=0,current=0;
    private ImageView last=new ImageView(getContext());
    private ImageView next=new ImageView(getContext());
    private RecyclerView re=new RecyclerView(getContext());
    private Context context;
    public PageChangeList(Context context) {
        super(context);
        this.context=context;
    }

    public PageChangeList(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
        this.context=context;
    }

    public PageChangeList(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        this.context=context;
    }

    @Override
    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
        int mViewGroupWidth  = getMeasuredWidth();  //当前ViewGroup的总宽度
        int mViewGroupHeight  = getMeasuredHeight();  //当前ViewGroup的总高度
        last.layout(0,0,last.getMeasuredWidth(),mViewGroupHeight);
        re.layout(last.getMeasuredWidth(),0,mViewGroupWidth-next.getMeasuredWidth(),mViewGroupHeight);
        next.layout(mViewGroupWidth-next.getMeasuredWidth(),0,mViewGroupWidth,mViewGroupHeight);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        measureChildren(widthMeasureSpec, heightMeasureSpec);
        setMeasuredDimension(widthMeasureSpec,100);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
    }

    public void setPageInfo(int total,int pages,int current){
        this.total=total;
        this.pages=pages;
        this.current=current;
    }

    public void show(){
        removeAllViews();
        LinearLayout.LayoutParams layoutParams=new LinearLayout.LayoutParams(40,40);
        last.setLayoutParams(layoutParams);
        next.setLayoutParams(layoutParams);

        last.setImageDrawable(getResources().getDrawable(R.drawable.lastblue));
        next.setImageDrawable(getResources().getDrawable(R.drawable.nextblue));

        LinearLayoutManager layoutManager = new LinearLayoutManager(getContext());
        layoutManager.setOrientation(RecyclerView.HORIZONTAL);
        re.setLayoutManager(layoutManager);
        re.scrollToPosition(current-1);
        PageListAdapter adapter=new PageListAdapter(getContext(),total,pages,current);
        re.setAdapter(adapter);
        adapter.notifyDataSetChanged();

/*        LinearLayout linearLayout=new LinearLayout(getContext());
        linearLayout.setOrientation(LinearLayout.HORIZONTAL);
        linearLayout.setGravity(Gravity.CENTER);

        linearLayout.addView(last);
        linearLayout.addView(re);
        linearLayout.addView(next);

        addView(linearLayout);*/
        this.addView(last);
        this.addView(re);
        this.addView(next);
    }

    public void setlast(OnClickListener onClickListener){
        last.setOnClickListener(onClickListener);
    }

    public void setnext(OnClickListener onClickListener){
        next.setOnClickListener(onClickListener);
    }

    OnClickListener numclick;
    public void setNum(OnClickListener onClickListener){
        this.numclick=onClickListener;
    }

    public class PageListAdapter extends RecyclerView.Adapter<PageListAdapter.ViewHolder>{
        Context context;
        private int total,pages,current;
        public PageListAdapter(Context context, int total, int pages, int current) {
            this.context=context;
            this.total=total;
            this.pages=pages;
            this.current=current;
        }

        @Override
        public ViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) {
            View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.page_list,viewGroup,false);
            ViewHolder holder = new ViewHolder(view);
            return holder;
        }

        @Override
        public void onBindViewHolder(ViewHolder holder, int position) {
            holder.num.setText((position+1)+"");
            if(position+1==current){
                holder.num.setTextColor(Color.RED);
            }
            holder.num.setOnClickListener(numclick);
        }

        @Override
        public int getItemViewType(int position) {
            return position;
        }

        @Override
        public int getItemCount() {
            return pages;
        }

        class ViewHolder extends RecyclerView.ViewHolder{
            TextView num;
            public ViewHolder(View itemView) {
                super(itemView);
                num=itemView.findViewById(R.id.num);
            }
        }
    }

}

其中图片是向左向右的两张小图。随便填俩吧

XML：就一个Linear和一个Text

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    android:id="@+id/pagelistlayout"
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal"
    android:gravity="center"
    android:layout_gravity="center"
    android:layout_marginLeft="10dp"
    android:layout_marginRight="10dp"
    android:layout_weight="1"
    android:layout_width="wrap_content"
    android:layout_height="match_parent">
    <TextView
        android:gravity="center"
        android:id="@+id/num"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>
</LinearLayout>

使用的话：

private PageChangeList pageChangeList;


pageChangeList.setPageInfo(total,pages,current);
pageChangeList.show();
pageChangeList.setlast(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                    请求下一页数据
            }
        });
pageChangeList.setnext(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                请求上一页
            }
        });

pageChangeList.setNum(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                TextView textView= (TextView) v;
                int c= Integer.parseInt(textView.getText().toString());
                请求某一页数据
});