短视频平台源码，动态上传的图片以九宫格形式展示实现的相关代码
public abstract class NineGridAdapter {
protected Context context;
protected List list;
public NineGridAdapter(Context context, List list) {
this.context = context;
this.list = list;
}
public abstract int getCount();
public abstract String getUrl(int positopn);
public abstract Object getItem(int position);
public abstract long getItemId(int position);
public abstract View getView(int i, View view);
}
自定义View多图控件
public class NineGridlayout extends ViewGroup {
private NineGridAdapter adapter;
private OnItemClickListerner onItemClickListerner;
// 行间距
private int lineSpace;
//列间距
private int gap;
private final int DEFAULT_WIDTH = 140;
private int columns;//
private int rows;//
private int totalWidth;
private Context context;
int singleWidth = 0, singleHeight = 0;
private int defaultWidth, defaultHeight;
private int oldCount;
public NineGridlayout(Context context) {
this(context, null);
}
public NineGridlayout(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public NineGridlayout(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
this.context = context;
gap = dip2px(context, 10);
lineSpace = dip2px(context,10);
ViewGroup.LayoutParams lp = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,
ViewGroup.LayoutParams.WRAP_CONTENT);
defaultWidth = defaultHeight = dip2px(context, DEFAULT_WIDTH);
}
public void setDefaultWidth(int defaultWidth) {
this.defaultWidth = defaultWidth;
}
public void setDefaultHeight(int defaultHeight) {
this.defaultHeight = defaultHeight;
}
public void setAdapter(NineGridAdapter adapter) {
this.adapter = adapter;
if (adapter == null) {
return;
}
//初始化布局形状
generateChildrenLayout(adapter.getCount());
//这里做一个重用view的处理
// if (oldCount == 0) {
removeAllViews();
for (int i = 0; i < adapter.getCount(); i++) {
View itemView = adapter.getView(i, null);
addView(itemView, generateDefaultLayoutParams());
}
// }
/*else {
//以前添加过view
int newViewCount = adapter.getCount();
if (oldCount > newViewCount) {
removeViews(newViewCount - 1, oldCount - newViewCount);
for (int i = 0; i < newViewCount - 1; i++) {
adapter.getView(i, getChildAt(i));
}
} else if (oldCount < newViewCount) {
for (int i = 0; i < newViewCount - oldCount; i++) {
View itemView = adapter.getView(i, null);
addView(itemView, generateDefaultLayoutParams());
}
}
}*/
oldCount = adapter.getCount();
requestLayout();
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int widthMode = MeasureSpec.getMode(widthMeasureSpec);
int heightMode = MeasureSpec.getMode(heightMeasureSpec);
int sizeWidth = MeasureSpec.getSize(widthMeasureSpec);
int sizeHeight = MeasureSpec.getSize(heightMeasureSpec);
totalWidth = sizeWidth - getPaddingLeft() - getPaddingRight();
if (adapter != null && adapter.getCount() > 0) {
int measureWidth, measureHeight;
int childrenCount = adapter.getCount();
if (childrenCount == 1) {
singleWidth = defaultWidth;
singleHeight = defaultHeight;
} else {
singleWidth = (totalWidth - gap * (3 - 1)) / 3;
singleHeight = singleWidth;
}
measureChildren(MeasureSpec.makeMeasureSpec(singleWidth, MeasureSpec.EXACTLY),
MeasureSpec.makeMeasureSpec(singleHeight, MeasureSpec.EXACTLY));
measureWidth = singleWidth * columns + gap * (columns - 1);
measureHeight = singleHeight * rows + lineSpace * (rows - 1);
setMeasuredDimension(sizeWidth, measureHeight);
}
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
layoutChildrenView();
}
private void layoutChildrenView() {
if (adapter == null || adapter.getCount() == 0) {
return;
}
int childrenCount = adapter.getCount();
for (int i = 0; i < childrenCount; i++) {
int[] position = findPosition(i);
int left = (singleWidth + gap) * position[1] + getPaddingLeft();
int top = (singleHeight + lineSpace) * position[0] + getPaddingTop();
int right = left + singleWidth;
int bottom = top + singleHeight;
ImageView childrenView = (ImageView) getChildAt(i);
if (childrenCount == 1) {
//只有一张图片
childrenView.setScaleType(ImageView.ScaleType.FIT_CENTER);
} else {
childrenView.setScaleType(ImageView.ScaleType.CENTER_CROP);
}
final int itemPosition = i;
childrenView.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if (onItemClickListerner != null) {
onItemClickListerner.onItemClick(v, itemPosition);
}
}
});
childrenView.layout(left, top, right, bottom);
}
}
private int[] findPosition(int childNum) {
int[] position = new int[2];
for (int i = 0; i < rows; i++) {
for (int j = 0; j < columns; j++) {
if ((i * columns + j) == childNum) {
position[0] = i;//行
position[1] = j;//列
break;
}
}
}
return position;
}
public int getGap() {
return gap;
}
public void setGap(int gap) {
this.gap = gap;
}
/**
* 根据图片个数确定行列数量
* 对应关系如下
* numrowcolumn
* 1 11
* 2 12
* 3 13
* 4 22
* 5 23
* 6 23
* 7 33
* 8 33
* 9 33
*
* @param length
*/
private void generateChildrenLayout(int length) {
if (length <= 3) {
rows = 1;
columns = length;
} else if (length <= 6) {
rows = 2;
columns = 3;
if (length == 4) {
columns = 2;
}
} else {
rows = 3;
columns = 3;
}
}
/**
* dp to px
*/
public static int dip2px(Context context, double dpValue) {
final float scale = context.getResources().getDisplayMetrics().density;
return (int) (dpValue * scale + 0.5f);
}
public void setOnItemClickListerner(OnItemClickListerner onItemClickListerner) {
this.onItemClickListerner = onItemClickListerner;
}
public interface OnItemClickListerner {
public void onItemClick(View view, int position);
}
}
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