短視訊平臺原始碼，動態上傳的圖片以九宮格形式展示實現的相關程式碼

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);
}

​

自定義View多圖控制元件

public class NineGridlayout extends ViewGroup {
  private NineGridAdapter adapter;
  private OnItemClickListerner onItemClickListerner;
  // 行間距
  private int lineSpace;
  //列間距
  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;
    }
    //初始化佈局形狀
    generateChildrenLayout(adapter.getCount());
    //這裡做一個重用view的處理
//    if (oldCount == 0) {
    removeAllViews();
    for (int i = 0; i < adapter.getCount(); i++) {
      View itemView = adapter.getView(i, null);
      addView(itemView, generateDefaultLayoutParams());
    }
//    }
    /*else {
      //以前新增過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) {
        //只有一張圖片
        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;
  }
  /**
  * 根據圖片個數確定行列數量
  * 對應關係如下
  * 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);
  }
}

以上就是短視訊平臺原始碼，動態上傳的圖片以九宮格形式展示實現的相關程式碼， 更多內容歡迎關注之後的文章