Android 朋友圈之多图显示

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Android 朋友圈之多图显示
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正文

先看一下效果图：

MultiImageView：

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，这里去掉注释即可。
//            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();}@Overrideprotected 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 beresult = 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// measureSpecresult = 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_parentaddView(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() {@Overridepublic void onClick(View v) {if (mOnItemClickListener != null) {mOnItemClickListener.onItemClick(v, position);}}});// 加载网络图片/设置图片显示Glide.with(getContext()).load(url).into(imageView);return imageView;}public interface OnItemClickListener {void onItemClick(View view, int position);}
}

点击有阴影的 ImageView :

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);}@Overridepublic 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;}
}

用法

<com.lvfq.myworkingtest.dynamic.view.MultiImageViewandroid:id="@+id/multi_image"android:layout_width="match_parent"android:layout_height="wrap_content"android:padding="@dimen/dp_10" />MultiImageView multiImageView = findViewById(R.id.multi_image);
multiImageView.setList(imgs);   // List<String> 类型的图片地址列表
multiImage.setOnItemClickListener(new MultiImageView.OnItemClickListener() {@Overridepublic void onItemClick(View view, int position) {// To do something or 查看大图.}});

代码已整理到 Github

附：如果需要完整朋友圈项目的话，这里推荐 Github 项目仿微信实现的朋友圈

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Android 朋友圈之多图显示

系列博客

正文

MultiImageView：

点击有阴影的 ImageView :

用法

代码已整理到 Github

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