流式标签.gif
1. 自定义View 实现该效果
Flowlayout.java
public class Flowlayout extends ViewGroup {
private List<String> mData;
private Context mContext;
//每一行view
protected List<List<View>> mAllViews = new ArrayList<List<View>>();
protected List<Integer> mLineHeight = new ArrayList<Integer>();
protected List<Integer> mLineWidth = new ArrayList<Integer>();
private List<View> mLineViews = new ArrayList<>();
private int mGravity = -1;
private static final int LEFT = -1;
private static final int CENTER = 0;
private static final int RIGHT = 1;
public Flowlayout(Context context) {
this(context, null);
}
public Flowlayout(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public Flowlayout(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
mContext = context;
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int sizeWidth = MeasureSpec.getSize(widthMeasureSpec);
int sizeHeight = MeasureSpec.getSize(heightMeasureSpec);
int modeWidth = MeasureSpec.getMode(widthMeasureSpec);
int modeHeight = MeasureSpec.getMode(heightMeasureSpec);
//每行的宽高
int lineWidth = 0;
int lineHeight = 0;
//测量子view后计算出的自身的宽高
int width = 0;
int height = 0;
for (int i = 0; i < getChildCount(); i++) {
View child = getChildAt(i);
if (child.getVisibility() == View.GONE) {
continue;
}
//测量该子view
measureChild(child, widthMeasureSpec, heightMeasureSpec);
MarginLayoutParams layoutParams = (MarginLayoutParams) child.getLayoutParams();
//获取子view宽高
int childWidth = child.getMeasuredWidth() + layoutParams.leftMargin + layoutParams.rightMargin;
int childHeight = child.getMeasuredHeight() + layoutParams.topMargin + layoutParams.bottomMargin;
if (lineWidth + childWidth > sizeWidth - getPaddingLeft() - getPaddingRight()) {
//已经超出viewgroup宽度了，换行
width = Math.max(width, lineWidth);
lineWidth = childWidth;
lineHeight = childHeight;
//换行了，要加上高度
height += childHeight;
} else {
//还未超出viewgroup宽度
lineWidth += childWidth;
//实时计算高度
if (childHeight > lineHeight) {
//如果同一行出现了更高的view，则重新计算高度
height = height - lineHeight;
lineHeight = childHeight;
height += lineHeight;
}
}
}
//测量完后报告最终计算的宽高
setMeasuredDimension(
modeWidth == MeasureSpec.EXACTLY ? sizeWidth : width + getPaddingLeft() + getPaddingRight(),
modeHeight == MeasureSpec.EXACTLY ? sizeHeight : height + getPaddingTop() + getPaddingBottom()//
);
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
mAllViews.clear();
mLineHeight.clear();
mLineWidth.clear();
mLineViews.clear();
int lineWidth = 0;
int lineHeight = 0;
for (int i = 0; i < getChildCount(); i++) {
View child = getChildAt(i);
if (child.getVisibility() == View.GONE) continue;
MarginLayoutParams layoutParams = (MarginLayoutParams) child.getLayoutParams();
int childWidth = child.getMeasuredWidth() + layoutParams.leftMargin + layoutParams.rightMargin;
int childHeight = child.getMeasuredHeight() + layoutParams.topMargin + layoutParams.bottomMargin;;
if (childWidth + lineWidth > getWidth() - getPaddingLeft() - getPaddingRight()) {
//换行
mLineHeight.add(lineHeight);
mLineWidth.add(lineWidth);
mAllViews.add(mLineViews);
//重置line相关参数
lineWidth = 0;
lineHeight = childHeight;
mLineViews = new ArrayList<>();
}
lineWidth += childWidth;
lineHeight = Math.max(lineHeight, childHeight);
mLineViews.add(child);
}
mLineHeight.add(lineHeight);
mLineWidth.add(lineWidth);
mAllViews.add(mLineViews);
int left = getPaddingLeft();
int top = getPaddingTop();
int lineNum = mAllViews.size();
//为每一行的view排位
for (int i = 0; i < lineNum; i++) {
mLineViews = mAllViews.get(i);
lineHeight = mLineHeight.get(i);
//设置位置
// set gravity
int currentLineWidth = this.mLineWidth.get(i);
switch (this.mGravity) {
case LEFT:
left = getPaddingLeft();
break;
case CENTER:
left = (getWidth() - currentLineWidth) / 2 + getPaddingLeft();
break;
case RIGHT:
left = getWidth() - currentLineWidth + getPaddingLeft();
break;
}
for (int j = 0; j < mLineViews.size(); j++) {
View child = mLineViews.get(j);
if (child.getVisibility() == View.GONE) continue;
MarginLayoutParams lp = (MarginLayoutParams) child
.getLayoutParams();
int lc = left + lp.leftMargin;
int tc = top + lp.topMargin;
int rc = lc + child.getMeasuredWidth();
int bc = tc + child.getMeasuredHeight();
child.layout(lc, tc, rc, bc);
left += child.getMeasuredWidth() + lp.leftMargin
+ lp.rightMargin;
}
top += lineHeight;
}
}
public void setData(List<String> data) {
this.mData = data;
if (data == null || data.isEmpty()) return;
for (int i = 0; i < data.size(); i++) {
TextView textView = new TextView(mContext);
textView.setText(data.get(i));
textView.setTextSize(20);
LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
layoutParams.setMargins(10, 10, 10, 10);
textView.setLayoutParams(layoutParams);
textView.setTextColor(Color.WHITE);
textView.setPadding(10, 5,10, 5);
textView.setBackgroundColor(getResources().getColor(R.color.blue));
addView(textView);
}
}
@Override
public LayoutParams generateLayoutParams(AttributeSet attrs) {
return new MarginLayoutParams(getContext(), attrs);
}
@Override
protected LayoutParams generateDefaultLayoutParams() {
return new MarginLayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
}
@Override
protected LayoutParams generateLayoutParams(LayoutParams p) {
return new MarginLayoutParams(p);
}
}
2.UI页面布局
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:padding="20dp"
android:layout_height="match_parent"
tools:context=".MainActivity">
<com.example.administrator.flowlayoutdemo.Flowlayout
android:id="@+id/flowlayout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</RelativeLayout>
3.更新UI 界面
MainActivity.java
public class MainActivity extends AppCompatActivity {
List<String> data = new ArrayList<>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
data.add("我要做远方的忠诚的儿子");
data.add("和物质的");
data.add("短暂情人");
data.add("和所有以梦为马的");
data.add("诗人一样");
data.add("我");
data.add("不得不和");
data.add("烈士和小丑");
data.add("走在同一道路上");
Flowlayout flowLayout = (Flowlayout) findViewById(R.id.flowlayout);
flowLayout.setData(data);
}
}
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