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”热门理财”的流式布局的实现
1.自定义流式布局
public class FlowLayout extends ViewGroup {
public FlowLayout(Context context) {
super(context);
}
public FlowLayout(Context context, AttributeSet attrs) {
super(context, attrs);
}
public FlowLayout(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int widthMode = MeasureSpec.getMode(widthMeasureSpec);
int widthSize = MeasureSpec.getSize(widthMeasureSpec);
int heightMode = MeasureSpec.getMode(heightMeasureSpec);
int heightSize = MeasureSpec.getSize(heightMeasureSpec);
//记录当前布局的宽高
int width = 0;
int height = 0;
//记录一行视图的宽度、高度
int lineWidth = 0;
int lineHeight = 0;
//获取在at_most模式下的布局的宽度、高度
int childCount = getChildCount();
for (int i = 0; i < childCount; i++) {
View childView = getChildAt(i);
measureChild(childView, widthMeasureSpec, heightMeasureSpec);
int childWidth = childView.getMeasuredWidth();
int childHeight = childView.getMeasuredHeight();
MarginLayoutParams mp = ((MarginLayoutParams) childView.getLayoutParams());
//表示当前的子视图还可以放在一行上
if (lineWidth + childWidth + mp.leftMargin + mp.rightMargin < widthSize) {
lineWidth += childWidth + mp.leftMargin + mp.rightMargin;
lineHeight = Math.max(lineHeight, childHeight + mp.topMargin + mp.bottomMargin);
} else {//换行
width = Math.max(width, lineWidth);
height += lineHeight;
//重置
lineWidth = childWidth + mp.leftMargin + mp.rightMargin;
lineHeight = childHeight + mp.topMargin + mp.bottomMargin;
}
if (i == childCount - 1) {
width = Math.max(width, lineWidth);
height += lineHeight;
}
}
Log.e("TAG", "width = " + width + ",height = " + height);
setMeasuredDimension(widthMode == MeasureSpec.EXACTLY ? widthSize : width, heightMode == MeasureSpec.EXACTLY ? heightSize : height);
}
private List<List<View>> allViews = new ArrayList<List<View>>();
private List<Integer> allHeights = new ArrayList<>();
@Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
int width = getWidth();
int childCount = getChildCount();
int lineWidth = 0;
int lineHeight = 0;
List<View> lineViews = new ArrayList<>();
for (int i = 0; i < childCount; i++) {
View childView = getChildAt(i);
int childWidth = childView.getMeasuredWidth();
int childHeight = childView.getMeasuredHeight();
MarginLayoutParams mp = (MarginLayoutParams) childView.getLayoutParams();
//不换行
if (lineWidth + childWidth + mp.leftMargin + mp.rightMargin < width) {
lineWidth += childWidth + mp.leftMargin + mp.rightMargin;
lineViews.add(childView);
lineHeight = Math.max(lineHeight, childHeight + mp.topMargin + mp.bottomMargin);
} else {//换行
allViews.add(lineViews);
allHeights.add(lineHeight);
lineViews = new ArrayList<>();
lineViews.add(childView);
lineWidth = childWidth + mp.leftMargin + mp.rightMargin;
lineHeight = childHeight + mp.topMargin + mp.bottomMargin;
}
if (i == childCount - 1) {
allViews.add(lineViews);
allHeights.add(lineHeight);
}
}
Log.e("TAG", "allViews.size = " + allViews.size() + ",allHeights.size = " + allHeights.size());
//通过计算每一行的每一个子view的left,top,right,bottom,摆放每一行的每一个子view的位置
int x = 0;
int y = 0;
for (int i = 0; i < allViews.size(); i++) {
int curLineHeight = allHeights.get(i);
//当前行的所有子view
List<View> views = allViews.get(i);
for (View view : views) {
int viewWidth = view.getMeasuredWidth();
int viewHeight = view.getMeasuredHeight();
MarginLayoutParams mp = (MarginLayoutParams) view.getLayoutParams();
int lc = x + mp.leftMargin;
int tc = y + mp.topMargin;
int rc = lc + viewWidth;
int bc = tc + viewHeight;
view.layout(lc, tc, rc, bc);
x += viewWidth + mp.rightMargin + mp.leftMargin;
}
x = 0;
y += curLineHeight;
}
}
//有了如下的方法，在上面通过child就可以getLayoutParams()
@Override
public ViewGroup.LayoutParams generateLayoutParams(AttributeSet attrs) {
MarginLayoutParams mp = new MarginLayoutParams(getContext(), attrs);
return mp;
}
}
2.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<com.atguigu.p2p.ui.FlowLayout
android:id="@+id/flow_hot"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@android:color/holo_green_light">
</com.atguigu.p2p.ui.FlowLayout>
</LinearLayout>
3.ProductHotFragment
public class ProductHotFragment extends BaseFragment {
@Bind(R.id.flow_layout)
FlowLayout flowLayout;
//提供页面要显示的数据
private String[] datas = new String[]{"新手计划", "乐享活系列90天计划", "钱包", "30天理财计划(加息2%)",
"林业局投资商业经营与大捞一笔", "中学老师购买车辆", "屌丝下海经商计划", "新西游影视拍",
"Java培训老师自己周转", "HelloWorld", "C++-C-ObjectC-java", "Android vs ios", "算法与数据结构", "JNI与NDK", "team working"};
private Random random;
@Override
protected RequestParams getParams() {
return null;
}
@Override
protected String getUrl() {
return null;
}
@Override
protected void initData(String content) {
random = new Random();
//1.动态的创建TextView
for(int i = 0; i < datas.length; i++) {
final TextView tv = new TextView(getActivity());
//设置TextView的属性
tv.setText(datas[i]);
tv.setTextSize(UIUtils.dp2Px(10));
ViewGroup.MarginLayoutParams mp = new ViewGroup.MarginLayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,ViewGroup.LayoutParams.WRAP_CONTENT);
mp.leftMargin = UIUtils.dp2Px(8);
mp.rightMargin = UIUtils.dp2Px(8);
mp.topMargin = UIUtils.dp2Px(8);
mp.bottomMargin = UIUtils.dp2Px(8);
tv.setLayoutParams(mp);
//设置textView的背景
int red = random.nextInt(211);
int green = random.nextInt(211);
int blue = random.nextInt(211);
//测试一：
// tv.setBackground(DrawUtils.getDrawable(Color.rgb(red,green,blue),UIUtils.dp2Px(5)));
//测试二：
tv.setBackground(DrawUtils.getSelector(DrawUtils.getDrawable(Color.rgb(re