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NineGridLayout
一个仿微信朋友圈和QQ空间的九宫格图片展示自定义控件。
GitHub：https://github.com/HMY314/NineGridLayout
一、介绍
1、当只有1张图时，可以自己定制图片宽高，也可以使用默认九宫格的宽高；
2、当只有4张图时，以2*2的方式显示；
3、除以上两种情况下，都是按照3列方式显示，但这时有一些细节：
a、如果只有9张图，当然是以3*3的方式显示；
b、如果超过9张图，可以设置是否全部显示。
如果设置不完全显示，则按照3*3的方式显示，但是在第9张图上会有一个带“+”号的数字，
代表还有几张没有显示，这里是模仿了QQ空间图片超出9张的显示方式；
如果设置全部显示，理所当然的将所有图片都显示出来。
4、图片被按下时，会有一个变暗的效果，这也是模仿微信朋友圈的效果。
二、使用方法
1、核心类是NineGridLayout，继承自ViewGroup的抽象类，所以我们实际项目使用需要继承它，并要实现3个方法，如下：
public abstract class NineGridLayout extends ViewGroup {
//******************************其他代码省略**************************
/**
* 显示一张图片
* @param imageView
* @param url
* @param parentWidth 父控件宽度
* @return true 代表按照九宫格默认大小显示，false 代表按照自定义宽高显示
*/
protected abstract boolean displayOneImage(RatioImageView imageView, String url, int parentWidth);
protected abstract void displayImage(RatioImageView imageView, String url);
/**
* 点击图片时执行
*/
protected abstract void onClickImage(int position, String url, List<String> urlList);
}2、我这里用NineGridTestLayout继承NineGridLayout实现，displayOneImage()与displayImage()中的参数都是显示图片需要的，我这里用的是ImageLoader显示图片，当然你也可以用其他的。
public class NineGridTestLayout extends NineGridLayout {
protected static final int MAX_W_H_RATIO = 3;
public NineGridTestLayout(Context context) {
super(context);
}
public NineGridTestLayout(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
protected boolean displayOneImage(final RatioImageView imageView, String url, final int parentWidth) {
//这里是只显示一张图片的情况，显示图片的宽高可以根据实际图片大小自由定制，parentWidth 为该layout的宽度
ImageLoader.getInstance().displayImage(imageView, url, ImageLoaderUtil.getPhotoImageOption(), new ImageLoadingListener() {
@Override
public void onLoadingStarted(String imageUri, View view) {
}
@Override
public void onLoadingFailed(String imageUri, View view, FailReason failReason) {
}
@Override
public void onLoadingComplete(String imageUri, View view, Bitmap bitmap) {
int w = bitmap.getWidth();
int h = bitmap.getHeight();
int newW;
int newH;
if (h > w * MAX_W_H_RATIO) {//h:w = 5:3
newW = parentWidth / 2;
newH = newW * 5 / 3;
} else if (h < w) {//h:w = 2:3
newW = parentWidth * 2 / 3;
newH = newW * 2 / 3;
} else {//newH:h = newW :w
newW = parentWidth / 2;
newH = h * newW / w;
}
setOneImageLayoutParams(imageView, newW, newH);
}
@Override
public void onLoadingCancelled(String imageUri, View view) {
}
});
return false;// true 代表按照九宫格默认大小显示(此时不要调用setOneImageLayoutParams)；false 代表按照自定义宽高显示。
}
@Override
protected void displayImage(RatioImageView imageView, String url) {
ImageLoaderUtil.getImageLoader(mContext).displayImage(url, imageView, ImageLoaderUtil.getPhotoImageOption());
}
@Override
protected void onClickImage(int i, String url, List<String> urlList) {
Toast.makeText(mContext, "点击了图片" + url, Toast.LENGTH_SHORT).show();
}
}3、在xml中实现
<com.hmy.ninegridlayout.view.NineGridTestLayout xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/layout_nine_grid"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
app:sapcing="4dp" />app:sapcing是设置九宫格中图片之间的间隔。
public List<String> urlList = new ArrayList<>();//图片url
NineGridTestLayout layout = (NineGridTestLayout) view.findViewById(R.id.layout_nine_grid);
layout.setIsShowAll(false); //当传入的图片数超过9张时，是否全部显示
layout.setSpacing(5); //动态设置图片之间的间隔
layout.setUrlList(urlList); //最后再设置图片url三、核心类
NineGridLayout.java
/**
* 描述:
* 作者：HMY
* 时间：2016/5/10
*/
public abstract class NineGridLayout extends ViewGroup {
private static final float DEFUALT_SPACING = 3f;
private static final int MAX_COUNT = 9;
protected Context mContext;
private float mSpacing = DEFUALT_SPACING;
private int mColumns;
private int mRows;
private int mTotalWidth;
private int mSingleWidth;
private boolean mIsShowAll = false;
private boolean mIsFirst = true;
private List<String> mUrlList = new ArrayList<>();
public NineGridLayout(Context context) {
super(context);
init(context);
}
public NineGridLayout(Context context, AttributeSet attrs) {
super(context, attrs);
TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.NineGridLayout);
mSpacing = typedArray.getDimension(R.styleable.NineGridLayout_sapcing, DEFUALT_SPACING);
typedArray.recycle();
init(context);
}
private void init(Context context) {
mContext = context;
if (getListSize(mUrlList) == 0) {
setVisibility(GONE);
}
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
@Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
mTotalWidth = right - left;
mSingleWidth = (int) ((mTotalWidth - mSpacing * (3 - 1)) / 3);
if (mIsFirst) {
notifyDataSetChanged();
mIsFirst = false;
}
}
/**
* 设置间隔
*
* @param spacing
*/
public void setSpacing(float spacing) {
mSpacing = spacing;
}
/**
* 设置是否显示所有图片（超过最大数时）
*
* @param isShowAll
*/
public void setIsShowAll(boolean isShowAll) {
mIsShowAll = isShowAll;
}
public void setUrlList(List<String> urlList) {
if (getListSize(urlList) == 0) {
setVisibility(GONE);
return;
}
setVisibility(VISIBLE);
mUrlList.clear();
mUrlList.addAll(urlList);
if (!mIsFirst) {
notifyDataSetChanged();
}
}
public void notifyDataSetChanged() {
removeAllViews();
int size = getListSize(mUrlList);
if (size > 0) {
setVisibility(VISIBLE);
} else {
setVisibility(GONE);
}
if (size == 1) {
String url = mUrlList.get(0);
RatioImageView imageView = createImageView(0, url);
//避免在ListView中一张图未加载成功时，布局高度受其他item影响
LayoutParams params = getLayoutParams();
params.height = mSingleWidth;
setLayoutParams(params);
imageView.layout(0, 0, mSingleWidth, mSingleWidth);
boolean isShowDefualt = displayOneImage(imageView, url, mTotalWidth);
if (isShowDefualt) {
layoutImageView(imageView, 0, url, false);
} else {
addView(imageView);
}
return;
}
generateChildrenLayout(size);
layoutParams();
for (int i = 0; i < size; i++) {
String url = mUrlList.get(i);
RatioImageView imageView;
if (!mIsShowAll) {
if (i < MAX_COUNT - 1) {
imageView = createImageView(i, url);
layoutImageView(imageView, i, url, false);
} else { //第9张时
if (size <= MAX_COUNT) {//刚好第9张
imageView = createImageView(i, url);
layoutImageView(imageView, i, url, false);
} else {//超过9张
imageView = createImageView(i, url);
layoutImageView(imageView, i, url, true);
break;
}
}
} else {
imageView = createImageView(i, url);
layoutImageView(imageView, i, url, false);
}
}
}
private void layoutParams() {
int singleHeight = mSingleWidth;
//根据子view数量确定高度
LayoutParams params = getLayoutParams();
params.height = (int) (singleHeight * mRows + mSpacing * (mRows - 1));
setLayoutParams(params);
}
private RatioImageView createImageView(final int i, final String url) {
RatioImageView imageView = new RatioImageView(mContext);
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
imageView.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
onClickImage(i, url, mUrlList);
}
});
return imageView;
}
/**
* @param imageView
* @param url
* @param showNumFlag 是否在最大值的图片上显示还有未显示的图片张数
*/
private void layoutImageView(RatioImageView imageView, int i, String url, boolean showNumFlag) {
final int singleWidth = (int) ((mTotalWidth - mSpacing * (3 - 1)) / 3);
int singleHeight = singleWidth;
int[] position = findPosition(i);
int left = (int) ((singleWidth + mSpacing) * position[1]);
int top = (int) ((singleHeight + mSpacing) * position[0]);
int right = left + singleWidth;
int bottom = top + singleHeight;
imageView.layout(left, top, right, bottom);
addView(imageView);
if (showNumFlag) {//添加超过最大显示数量的文本
int overCount = getListSize(mUrlList) - MAX_COUNT;
if (overCount > 0) {
float textSize = 30;
final TextView textView = new TextView(mContext);
textView.setText("+" + String.valueOf(overCount));
textView.setTextColor(Color.WHITE);
textView.setPadding(0, singleHeight / 2 - getFontHeight(textSize), 0, 0);
textView.setTextSize(textSize);
textView.setGravity(Gravity.CENTER);
textView.setBackgroundColor(Color.BLACK);
textView.getBackground().setAlpha(120);
textView.layout(left, top, right, bottom);
addView(textView);
}
}
displayImage(imageView, url);
}
private int[] findPosition(int childNum) {
int[] position = new int[2];
for (int i = 0; i < mRows; i++) {
for (int j = 0; j < mColumns; j++) {
if ((i * mColumns + j) == childNum) {
position[0] = i;//行
position[1] = j;//列
break;
}
}
}
return position;
}
/**
* 根据图片个数确定行列数量
*
* @param length
*/
private void generateChildrenLayout(int length) {
if (length <= 3) {
mRows = 1;
mColumns = length;
} else if (length <= 6) {
mRows = 2;
mColumns = 3;
if (length == 4) {
mColumns = 2;
}
} else {
mColumns = 3;
if (mIsShowAll) {
mRows = length / 3;
int b = length % 3;
if (b > 0) {
mRows++;
}
} else {
mRows = 3;
}
}
}
protected void setOneImageLayoutParams(RatioImageView imageView, int width, int height) {
imageView.setLayoutParams(new LayoutParams(width, height));
imageView.layout(0, 0, width, height);
LayoutParams params = getLayoutParams();
// params.width = width;
params.height = height;
setLayoutParams(params);
}
private int getListSize(List<String> list) {
if (list == null || list.size() == 0) {
return 0;
}
return list.size();
}
private int getFontHeight(float fontSize) {
Paint paint = new Paint();
paint.setTextSize(fontSize);
Paint.FontMetrics fm = paint.getFontMetrics();
return (int) Math.ceil(fm.descent - fm.ascent);
}
/**
* @param imageView
* @param url
* @param parentWidth 父控件宽度
* @return true 代表按照九宫格默认大小显示，false 代表按照自定义宽高显示
*/
protected abstract boolean displayOneImage(RatioImageView imageView, String url, int parentWidth);
protected abstract void displayImage(RatioImageView imageView, String url);
protected abstract void onClickImage(int position, String url, List<String> urlList);
}
RatioImageView.java
该类有两个功能：
1、是用于ImageView被按下时有变暗效果
2、ImageView的宽高根据设置的比例动态适配高度，如在xml中设置 app:ratio="2" ，ImageView的高度根据其宽度改变，但始终是宽的2倍，该功能在该项目中没有使用。
/**
* 根据宽高比例自动计算高度ImageView
* Created by HMY on 2016/4/21.
*/
public class RatioImageView extends ImageView {
/**
* 宽高比例
*/
private float mRatio = 0f;
public RatioImageView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
public RatioImageView(Context context, AttributeSet attrs) {
super(context, attrs);
TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.RatioImageView);
mRatio = typedArray.getFloat(R.styleable.RatioImageView_ratio, 0f);
typedArray.recycle();
}
public RatioImageView(Context context) {
super(context);
}
/**
* 设置ImageView的宽高比
*
* @param ratio
*/
public void setRatio(float ratio) {
mRatio = ratio;
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int width = MeasureSpec.getSize(widthMeasureSpec);
if (mRatio != 0) {
float height = width / mRatio;
heightMeasureSpec = MeasureSpec.makeMeasureSpec((int) height, MeasureSpec.EXACTLY);
}
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
Drawable drawable = getDrawable();
if (drawable != null) {
drawable.mutate().setColorFilter(Color.GRAY,
PorterDuff.Mode.MULTIPLY);
}
break;
case MotionEvent.ACTION_MOVE:
break;
case MotionEvent.ACTION_CANCEL:
case MotionEvent.ACTION_UP:
Drawable drawableUp = getDrawable();
if (drawableUp != null) {
drawableUp.mutate().clearColorFilter();
}
break;
}
return super.onTouchEvent(event);
}
}
代码可在我的GitHub上下载，地址：https://github.com/HMY314/NineGridLayout
效果图
