Android学QQ空间相册浏览类型横向滑动效果显示多图片MyHorizontalScrollView / 憋错料

Android学QQ空间相册浏览类型横向滑动效果显示多图片MyHorizontalScrollView

我们来定制一下吧

布局文件：activity_main.xml

<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:background="@android:color/white"
    android:orientation="vertical" >

    <FrameLayout
        android:layout_width="fill_parent"
        android:layout_height="0dp"
        android:layout_weight="1" >

        <ImageView
            android:id="@+id/id_content"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:layout_gravity="center"
            android:layout_margin="10dp"
            android:scaleType="centerCrop"
            android:src="@mipmap/ic_launcher" />
    </FrameLayout>

    <com.example.lenovo.myapplication.MyHorizontalScrollView
        android:id="@+id/id_horizontalScrollView"
        android:layout_width="wrap_content"
        android:layout_height="150dp"
        android:layout_gravity="bottom"
        android:background="@android:color/white"
        android:scrollbars="none" >

        <LinearLayout
            android:id="@+id/id_gallery"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical"
            android:orientation="horizontal" >
        </LinearLayout>
    </com.example.lenovo.myapplication.MyHorizontalScrollView>

</LinearLayout>

布局文件：activity_index_gallery_item.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="120dp"
    android:layout_height="130dp"
    android:background="@android:color/white" >

    <ImageView
        android:id="@+id/id_index_gallery_item_image"
        android:layout_width="80dp"
        android:layout_height="80dp"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_margin="5dp"
        android:scaleType="centerCrop" />

    <TextView
        android:id="@+id/id_index_gallery_item_text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/id_index_gallery_item_image"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="5dp"
        android:layout_marginTop="5dp"
        android:textColor="#ff0000"
        android:textSize="12dp" />

</RelativeLayout>

展示视图控制文件：MainActivity

package com.example.lenovo.myapplication;

import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.view.View;
import android.view.Window;
import android.widget.ImageView;

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

public class MainActivity extends Activity
{

    private MyHorizontalScrollView mHorizontalScrollView;
    private HorizontalScrollViewAdapter mAdapter;
    private ImageView mImg;
    private List<Integer> mDatas = new ArrayList<Integer>(Arrays.asList(
            R.drawable.a, R.drawable.b, R.drawable.c, R.drawable.d,
            R.drawable.e, R.drawable.f, R.drawable.g, R.drawable.h,
            R.drawable.l));

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.activity_main);

        mImg = (ImageView) findViewById(R.id.id_content);

        mHorizontalScrollView = (MyHorizontalScrollView) findViewById(R.id.id_horizontalScrollView);
        mAdapter = new HorizontalScrollViewAdapter(this, mDatas);
        //添加滚动回调
        mHorizontalScrollView
                .setCurrentImageChangeListener(new MyHorizontalScrollView.CurrentImageChangeListener()
                {
                    @Override
                    public void onCurrentImgChanged(int position,
                                                    View viewIndicator)
                    {
                        mImg.setImageResource(mDatas.get(position));
                        viewIndicator.setBackgroundColor(Color
                                .parseColor("#AA024DA4"));
                    }
                });
        //添加点击回调
        mHorizontalScrollView.setOnItemClickListener(new MyHorizontalScrollView.OnItemClickListener()
        {

            @Override
            public void onClick(View view, int position)
            {
                mImg.setImageResource(mDatas.get(position));
                view.setBackgroundColor(Color.parseColor("#AA024DA4"));
            }
        });
        //设置适配器
        mHorizontalScrollView.initDatas(mAdapter);
    }

}

这里接触一下适配器HorizontalScrollViewAdapter

package com.example.lenovo.myapplication;

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

import java.util.List;

/**
 * Created by yang_zzheng on 2016/7/13
 * [email protected]
 */
public class HorizontalScrollViewAdapter
{

    private Context mContext;
    private LayoutInflater mInflater;
    private List<Integer> mDatas;

    public HorizontalScrollViewAdapter(Context context, List<Integer> mDatas)
    {
        this.mContext = context;
        mInflater = LayoutInflater.from(context);
        this.mDatas = mDatas;
    }

    public int getCount()
    {
        return mDatas.size();
    }

    public Object getItem(int position)
    {
        return mDatas.get(position);
    }

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

    public View getView(int position, View convertView, ViewGroup parent)
    {
        ViewHolder viewHolder = null;
        if (convertView == null)
        {
            viewHolder = new ViewHolder();
            convertView = mInflater.inflate(
                    R.layout.activity_index_gallery_item, parent, false);
            viewHolder.mImg = (ImageView) convertView
                    .findViewById(R.id.id_index_gallery_item_image);
            viewHolder.mText = (TextView) convertView
                    .findViewById(R.id.id_index_gallery_item_text);

            convertView.setTag(viewHolder);
        } else
        {
            viewHolder = (ViewHolder) convertView.getTag();
        }
        viewHolder.mImg.setImageResource(mDatas.get(position));
        viewHolder.mText.setText("美女");

        return convertView;
    }

    private class ViewHolder
    {
        ImageView mImg;
        TextView mText;
    }

}

我们自己定义的滚动条MyHorizontalScrollView

package com.example.lenovo.myapplication;

import android.content.Context;
import android.graphics.Color;
import android.util.AttributeSet;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.WindowManager;
import android.widget.HorizontalScrollView;
import android.widget.LinearLayout;

import java.util.HashMap;
import java.util.Map;

/**
 * Created by yang_zzheng on 2016/7/13
 * [email protected]
 */
public class MyHorizontalScrollView extends HorizontalScrollView implements
        View.OnClickListener
{

    /**
     * 图片滚动时的回调接口
     *
     * @author zhy
     *
     */
    public interface CurrentImageChangeListener
    {
        void onCurrentImgChanged(int position, View viewIndicator);
    }

    /**
     * 条目点击时的回调
     *
     * @author zhy
     *
     */
    public interface OnItemClickListener
    {
        void onClick(View view, int pos);
    }

    private CurrentImageChangeListener mListener;

    private OnItemClickListener mOnClickListener;

    private static final String TAG = "MyHorizontalScrollView";

    /**
     * HorizontalListView中的LinearLayout
     */
    private LinearLayout mContainer;

    /**
     * 子元素的宽度
     */
    private int mChildWidth;
    /**
     * 子元素的高度
     */
    private int mChildHeight;
    /**
     * 当前最后一张图片的index
     */
    private int mCurrentIndex;
    /**
     * 当前第一张图片的下标
     */
    private int mFristIndex;
    /**
     * 当前第一个View
     */
    private View mFirstView;
    /**
     * 数据适配器
     */
    private HorizontalScrollViewAdapter mAdapter;
    /**
     * 每屏幕最多显示的个数
     */
    private int mCountOneScreen;
    /**
     * 屏幕的宽度
     */
    private int mScreenWitdh;

    /**
     * 保存View与位置的键值对
     */
    private Map<View, Integer> mViewPos = new HashMap<View, Integer>();

    public MyHorizontalScrollView(Context context, AttributeSet attrs)
    {
        super(context, attrs);
        // 获得屏幕宽度
        WindowManager wm = (WindowManager) context
                .getSystemService(Context.WINDOW_SERVICE);
        DisplayMetrics outMetrics = new DisplayMetrics();
        wm.getDefaultDisplay().getMetrics(outMetrics);
        mScreenWitdh = outMetrics.widthPixels;
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
    {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        mContainer = (LinearLayout) getChildAt(0);
    }

    /**
     * 加载下一张图片
     */
    protected void loadNextImg()
    {
        // 数组边界值计算
        if (mCurrentIndex == mAdapter.getCount() - 1)
        {
            return;
        }
        //移除第一张图片，且将水平滚动位置置0
        scrollTo(0, 0);
        mViewPos.remove(mContainer.getChildAt(0));
        mContainer.removeViewAt(0);

        //获取下一张图片，并且设置onclick事件，且加入容器中
        View view = mAdapter.getView(++mCurrentIndex, null, mContainer);
        view.setOnClickListener(this);
        mContainer.addView(view);
        mViewPos.put(view, mCurrentIndex);

        //当前第一张图片小标
        mFristIndex++;
        //如果设置了滚动监听则触发
        if (mListener != null)
        {
            notifyCurrentImgChanged();
        }

    }
    /**
     * 加载前一张图片
     */
    protected void loadPreImg()
    {
        //如果当前已经是第一张，则返回
        if (mFristIndex == 0)
            return;
        //获得当前应该显示为第一张图片的下标
        int index = mCurrentIndex - mCountOneScreen;
        if (index >= 0)
        {
//          mContainer = (LinearLayout) getChildAt(0);
            //移除最后一张
            int oldViewPos = mContainer.getChildCount() - 1;
            mViewPos.remove(mContainer.getChildAt(oldViewPos));
            mContainer.removeViewAt(oldViewPos);

            //将此View放入第一个位置
            View view = mAdapter.getView(index, null, mContainer);
            mViewPos.put(view, index);
            mContainer.addView(view, 0);
            view.setOnClickListener(this);
            //水平滚动位置向左移动view的宽度个像素
            scrollTo(mChildWidth, 0);
            //当前位置--，当前第一个显示的下标--
            mCurrentIndex--;
            mFristIndex--;
            //回调
            if (mListener != null)
            {
                notifyCurrentImgChanged();

            }
        }
    }

    /**
     * 滑动时的回调
     */
    public void notifyCurrentImgChanged()
    {
        //先清除所有的背景色，点击时会设置为蓝色
        for (int i = 0; i < mContainer.getChildCount(); i++)
        {
            mContainer.getChildAt(i).setBackgroundColor(Color.WHITE);
        }

        mListener.onCurrentImgChanged(mFristIndex, mContainer.getChildAt(0));

    }

    /**
     * 初始化数据，设置数据适配器
     *
     * @param mAdapter
     */
    public void initDatas(HorizontalScrollViewAdapter mAdapter)
    {
        this.mAdapter = mAdapter;
        mContainer = (LinearLayout) getChildAt(0);
        // 获得适配器中第一个View
        final View view = mAdapter.getView(0, null, mContainer);
        mContainer.addView(view);

        // 强制计算当前View的宽和高
        if (mChildWidth == 0 && mChildHeight == 0)
        {
            int w = View.MeasureSpec.makeMeasureSpec(0,
                    View.MeasureSpec.UNSPECIFIED);
            int h = View.MeasureSpec.makeMeasureSpec(0,
                    View.MeasureSpec.UNSPECIFIED);
            view.measure(w, h);
            mChildHeight = view.getMeasuredHeight();
            mChildWidth = view.getMeasuredWidth();
            Log.e(TAG, view.getMeasuredWidth() + "," + view.getMeasuredHeight());
            mChildHeight = view.getMeasuredHeight();
            // 计算每次加载多少个View
            mCountOneScreen = (mScreenWitdh / mChildWidth == 0)?mScreenWitdh / mChildWidth+1:mScreenWitdh / mChildWidth+2;

            Log.e(TAG, "mCountOneScreen = " + mCountOneScreen
                    + " ,mChildWidth = " + mChildWidth);

        }
        //初始化第一屏幕的元素
        initFirstScreenChildren(mCountOneScreen);
    }

    /**
     * 加载第一屏的View
     *
     * @param mCountOneScreen
     */
    public void initFirstScreenChildren(int mCountOneScreen)
    {
        mContainer = (LinearLayout) getChildAt(0);
        mContainer.removeAllViews();
        mViewPos.clear();

        for (int i = 0; i < mCountOneScreen; i++)
        {
            View view = mAdapter.getView(i, null, mContainer);
            view.setOnClickListener(this);
            mContainer.addView(view);
            mViewPos.put(view, i);
            mCurrentIndex = i;
        }

        if (mListener != null)
        {
            notifyCurrentImgChanged();
        }

    }

    @Override
    public boolean onTouchEvent(MotionEvent ev)
    {
        switch (ev.getAction())
        {
            case MotionEvent.ACTION_MOVE:
//          Log.e(TAG, getScrollX() + "");

                int scrollX = getScrollX();
                // 如果当前scrollX为view的宽度，加载下一张，移除第一张
                if (scrollX >= mChildWidth)
                {
                    loadNextImg();
                }
                // 如果当前scrollX = 0， 往前设置一张，移除最后一张
                if (scrollX == 0)
                {
                    loadPreImg();
                }
                break;
        }
        return super.onTouchEvent(ev);
    }

    @Override
    public void onClick(View v)
    {
        if (mOnClickListener != null)
        {
            for (int i = 0; i < mContainer.getChildCount(); i++)
            {
                mContainer.getChildAt(i).setBackgroundColor(Color.WHITE);
            }
            mOnClickListener.onClick(v, mViewPos.get(v));
        }
    }

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

    public void setCurrentImageChangeListener(
            CurrentImageChangeListener mListener)
    {
        this.mListener = mListener;
    }

}