android 矩形布局

在开发中可能你需要一个2*2，或者3*3，N*N的布局，但是又不会涉及到滑动，此时可以自定义一个不需要滑动的网格布局。
public class UserTopicGridView extends RelativeLayout{
private Context mContext;
private Activity mActivity;
private String title;
private TApplication mTApplication;
private int columnLine = 2;
private int childWidth = 100;
private int childHeight = 100;
private int horSpace = 10;
private int verSpace = 10;
public UserTopicGridView(Context context, AttributeSet attrs) {
super(context, attrs);
this.mContext = context;
mActivity = (Activity) this.mContext;
mTApplication = (TApplication) mActivity.getApplication();
}

public void setTitle(String title) {
    this.title = title;
}

public void setChildSize(int width ,int height) {
    this.childWidth = width;
    this.childHeight = height;
    requestLayout();
}

public void setPadding(int horSpace, int verSpace) {
    this.horSpace = horSpace;
    this.verSpace = verSpace;
    requestLayout();
}

public void initViews(final HomeListBean homeListBean) {
    List <Object> list = homeListBean.items;
    for(int i = 0; i < list.size(); i++) {
        ImageView imageView = new ImageView(mContext);
        RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(childWidth, childHeight);
        imageView.setLayoutParams(params);
        imageView.setScaleType(ScaleType.FIT_XY);
        ImageLoader.getInstance().displayImage((String)list.get(i), imageView, mTApplication.getOptions());
        imageView.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                //do something
            }
        });
        addView(imageView);
    }
}

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    int count = getChildCount();
    for (int i = 0; i < count; i++) {
        int childWidthMeasureSpec = MeasureSpec
                .makeMeasureSpec(childWidth, MeasureSpec.EXACTLY);
        int childheightMeasureSpec = MeasureSpec
                .makeMeasureSpec(childHeight, MeasureSpec.EXACTLY);
        View child = getChildAt(i);
        child.measure(childWidthMeasureSpec, childheightMeasureSpec);
    }
    int newParentWidth = childWidth * columnLine + horSpace * (columnLine - 1);
    int newParentHeight = childHeight * getLine() + verSpace * (getLine() - 1);
    setMeasuredDimension(newParentWidth, newParentHeight);
}

@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
    int childCount = getChildCount();
    int left = 0;
    int top = 0;
    for(int i = 0; i < childCount; i++) {
        if(isNewLine(i)) {
            top += childHeight + verSpace;
            left = 0;
        }
        View view = getChildAt(i);
        view.layout(left, top, left + childWidth, childHeight + top);
        left += childWidth + horSpace;
    }
}

private boolean isNewLine(int index) {
    if(index !=0 && index % columnLine == 0) {
        return true;
    }
    return false;
}

private int getLine() {
    int line = 0;
    line = getChildCount() / 2;
    if(getChildCount() % columnLine != 0) {
        line += 1;
    }
    return line;
}

}

第一篇博客，略显粗糙，没有注释，但是相信大家都会懂，晚安。