Android 仿朋友圈之多图显示(一)

一：效果

1.MultiImageView ：

import android.content.Context;
import android.text.TextUtils;
import android.util.AttributeSet;
import android.view.View;
import android.widget.ImageView;
import android.widget.ImageView.ScaleType;
import android.widget.LinearLayout;

import com.bumptech.glide.Glide;
import com.lvfq.library.utils.LvDPUtil;

import java.util.List;

/**
 * @author sgf
 * @ClassName MultiImageView.java
 * @Description: 显示1~N张图片的View
 */

public class MultiImageView extends LinearLayout {
    public static int MAX_WIDTH = 0;

    // 照片的Url列表
    private List<String> imagesList;

    /**
     * 长度 单位为Pixel *
     */
    private int pxOneMaxWandH;  // 单张图最大允许宽高
    private int pxMoreWandH = 0;// 多张图的宽高
    private int pxImagePadding = LvDPUtil.dip2px(3);// 图片间的间距

    private int MAX_PER_ROW_COUNT = 3;// 每行显示最大数

    private LayoutParams onePicPara;
    private LayoutParams morePara, moreParaColumnFirst;
    private LayoutParams rowPara;

    private OnItemClickListener mOnItemClickListener;

    public void setOnItemClickListener(OnItemClickListener onItemClickListener) {
        mOnItemClickListener = onItemClickListener;
    }

    public MultiImageView(Context context) {
        super(context);
    }

    public MultiImageView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public void setList(List<String> lists) throws IllegalArgumentException {
        if (lists == null) {
            throw new IllegalArgumentException("imageList is null...");
        }
        imagesList = lists;

        if (MAX_WIDTH > 0) {
            // 如果需要两张和四张图横向铺满，
//            if (lists.size() == 2 || lists.size() == 4) {
//                pxMoreWandH = (MAX_WIDTH - pxImagePadding) / 2;
//            } else {
            pxMoreWandH = (MAX_WIDTH - pxImagePadding * 2) / 3; //解决右侧图片和内容对不齐问题
//            }
            pxOneMaxWandH = MAX_WIDTH * 2 / 3;  // 一张图的时候，图片宽度
            initImageLayoutParams();
        }

        initView();
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        if (MAX_WIDTH == 0) {
            int width = measureWidth(widthMeasureSpec);
            if (width > 0) {
                MAX_WIDTH = width - getPaddingLeft() - getPaddingRight();
                if (imagesList != null && imagesList.size() > 0) {
                    setList(imagesList);
                }
            }
        }
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    }

    /**
     * Determines the width of this view
     *
     * @param measureSpec A measureSpec packed into an int
     * @return The width of the view, honoring constraints from measureSpec
     */
    private int measureWidth(int measureSpec) {
        int result = 0;
        int specMode = MeasureSpec.getMode(measureSpec);
        int specSize = MeasureSpec.getSize(measureSpec);

        if (specMode == MeasureSpec.EXACTLY) {
            // We were told how big to be
            result = specSize;
        } else {
            // Measure the text
            // result = (int) mTextPaint.measureText(mText) + getPaddingLeft()
            // + getPaddingRight();
            if (specMode == MeasureSpec.AT_MOST) {
                // Respect AT_MOST value if that was what is called for by
                // measureSpec
                result = Math.min(result, specSize);
            }
        }
        return result;
    }

    private void initImageLayoutParams() {
        int wrap = LayoutParams.WRAP_CONTENT;
        int match = LayoutParams.MATCH_PARENT;

        onePicPara = new LayoutParams(pxOneMaxWandH, wrap);

        moreParaColumnFirst = new LayoutParams(pxMoreWandH, pxMoreWandH);
        morePara = new LayoutParams(pxMoreWandH, pxMoreWandH);
        morePara.setMargins(pxImagePadding, 0, 0, 0);

        rowPara = new LayoutParams(match, wrap);
    }

    // 根据imageView的数量初始化不同的View布局,还要为每一个View作点击效果
    private void initView() {
        this.setOrientation(VERTICAL);
        this.removeAllViews();
        if (MAX_WIDTH == 0) {
            //为了触发onMeasure()来测量MultiImageView的最大宽度，MultiImageView的宽设置为match_parent
            addView(new View(getContext()));
            return;
        }

        if (imagesList == null || imagesList.size() == 0) {
            return;
        }

        if (imagesList.size() == 1) {
            addView(createImageView(0, false));
        } else {
            int allCount = imagesList.size();
            if (allCount == 4) {
                MAX_PER_ROW_COUNT = 2;
            } else {
                MAX_PER_ROW_COUNT = 3;
            }
            int rowCount = allCount / MAX_PER_ROW_COUNT
                    + (allCount % MAX_PER_ROW_COUNT > 0 ? 1 : 0);// 行数
            for (int rowCursor = 0; rowCursor < rowCount; rowCursor++) {
                LinearLayout rowLayout = new LinearLayout(getContext());
                rowLayout.setOrientation(LinearLayout.HORIZONTAL);

                rowLayout.setLayoutParams(rowPara);
                if (rowCursor != 0) {
                    rowLayout.setPadding(0, pxImagePadding, 0, 0);
                }

                int columnCount = allCount % MAX_PER_ROW_COUNT == 0 ? MAX_PER_ROW_COUNT
                        : allCount % MAX_PER_ROW_COUNT;//每行的列数
                if (rowCursor != rowCount - 1) {
                    columnCount = MAX_PER_ROW_COUNT;
                }
                addView(rowLayout);

                int rowOffset = rowCursor * MAX_PER_ROW_COUNT;// 行偏移
                for (int columnCursor = 0; columnCursor < columnCount; columnCursor++) {
                    int position = columnCursor + rowOffset;
                    rowLayout.addView(createImageView(position, true));
                }
            }
        }
    }

    private ImageView createImageView(final int position, final boolean isMultiImage) {
        String url = "";
        if (!TextUtils.isEmpty(imagesList.get(position))) {
            url = imagesList.get(position);
        }

        ImageView imageView = new ColorFilterImageView(getContext());
        if (isMultiImage) {
            imageView.setScaleType(ScaleType.CENTER_CROP);
            imageView.setLayoutParams(position % MAX_PER_ROW_COUNT == 0 ? moreParaColumnFirst : morePara);
        } else {
            imageView.setAdjustViewBounds(true);
            imageView.setScaleType(ScaleType.FIT_START);
            imageView.setMaxHeight(pxOneMaxWandH);
            imageView.setLayoutParams(onePicPara);
        }

        imageView.setId(url.hashCode());
        imageView.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                if (mOnItemClickListener != null) {
                    mOnItemClickListener.onItemClick(v, position);
                }
            }
        });
        // TODO: 2016/10/18 之后设置网络图片
        Glide.with(getContext()).load(url).into(imageView);
        return imageView;
    }

    public interface OnItemClickListener {
        void onItemClick(View view, int position);
    }
}

2.添加依赖包：

 implementation 'com.lfq:AndroidUtils:1.1.6'

3.带有阴影的ImageView ：

import android.content.Context;
import android.graphics.Color;
import android.graphics.PorterDuff.Mode;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.widget.ImageView;

/**
 * @author sgf
 * @ClassName: ColorFilterImageView
 * @Description: 实现图像根据按下抬起动作变化颜色
 */
public class ColorFilterImageView extends ImageView implements OnTouchListener {
    public ColorFilterImageView(Context context) {
        this(context, null, 0);
    }

    public ColorFilterImageView(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public ColorFilterImageView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        init();
    }

    private void init() {
        setOnTouchListener(this);
    }

    @Override
    public boolean onTouch(View v, MotionEvent event) {
        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:  // 按下时图像变灰
                setColorFilter(Color.GRAY, Mode.MULTIPLY);
                break;
            case MotionEvent.ACTION_UP:   // 手指离开或取消操作时恢复原色
            case MotionEvent.ACTION_CANCEL:
                setColorFilter(Color.TRANSPARENT);
                break;
            default:
                break;
        }
        return false;
    }
}

4.布局：

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

    <TextView
        android:id="@+id/tv_title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="@dimen/dp_10"
        android:layout_marginTop="@dimen/dp_10"
        android:textSize="@dimen/sp_20"
        android:textStyle="bold" />

    <com.sgf.test.MultiImageView
        android:id="@+id/multi_image"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:padding="@dimen/dp_10" />

</LinearLayout>

5.实现：

import android.app.Activity;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.FragmentActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;

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

/**
 * ImageActivity 
 *
 * @author sgf
 */

public class ImageActivity extends FragmentActivity {

    RecyclerView recyclerView;
    CommonAdapter<String> mAdapter;
    List<String> mList = new ArrayList<>();

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_dynamic_image);

        recyclerView = LvV.find(this, R.id.recyclerView);
        mList = Data.getImgs(9);

        initAdapter();

        recyclerView.setLayoutManager(new LinearLayoutManager(this));
        recyclerView.setAdapter(mAdapter);

    }

    private void initAdapter() {
        mAdapter = new CommonAdapter<String>(this, R.layout.item_dynamic_image, mList) {
            @Override
            protected void convert(ViewHolder holder, String s, int position) {
                MultiImageView multiImage = holder.getView(R.id.multi_image);
                holder.setText(R.id.tv_title, (position + 1) + "张图");
                multiImage.setList(Data.getImgs(position + 1));
                final int pos = position;
                multiImage.setOnItemClickListener(new MultiImageView.OnItemClickListener() {
                    @Override
                    public void onItemClick(View view, int position) {
                        LvToastUtil.showToast((Activity) mContext, "position1:" + pos + " , position2:" + position);
                    }
                });
            }
        };

    }
}

multiImageView.setList(imgs);   // List<String> 类型的图片地址列表
multiImage.setOnItemClickListener(new MultiImageView.OnItemClickListener() {
                    @Override
                    public void onItemClick(View view, int position) {
                       // To do something or 查看大图.
                    }
                });

Android 仿朋友圈之多图显示(一)

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