FlowLayout实现自定义的流式布局
还是老规矩,先看效果再看代码
废话不多说,直接上代码
首先自定义一个FlowLayout类
import android.content.Context; import android.util.AttributeSet; import android.view.View; import android.view.ViewGroup; import java.util.ArrayList; import java.util.List; /** * Created by BAIPEI on 2017/11/30. */ 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) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); int sizeWidth = MeasureSpec.getSize(widthMeasureSpec); int modeWidth = MeasureSpec.getMode(widthMeasureSpec); int sizeHeight = MeasureSpec.getSize(heightMeasureSpec); int modeHeight = MeasureSpec.getMode(heightMeasureSpec); // 如果是warp_content情况下,记录宽和高 int width = 0; int height = 0; // 记录每一行的宽度与高度 int lineWidth = 0; int lineHeight = 0; // 得到内部元素的个数 int cCount = getChildCount(); for (int i = 0; i < cCount; i++) { // 通过索引拿到每一个子view View child = getChildAt(i); // 测量子View的宽和高,系统提供的measureChild measureChild(child, widthMeasureSpec, heightMeasureSpec); // 得到LayoutParams MarginLayoutParams lp = (MarginLayoutParams) child .getLayoutParams(); // 子View占据的宽度 int childWidth = child.getMeasuredWidth() + lp.leftMargin + lp.rightMargin; // 子View占据的高度 int childHeight = child.getMeasuredHeight() + lp.topMargin + lp.bottomMargin; // 换行 判断 当前的宽度大于 开辟新行 if (lineWidth + childWidth > sizeWidth - getPaddingLeft() - getPaddingRight()) { // 对比得到最大的宽度 width = Math.max(width, lineWidth); // 重置lineWidth lineWidth = childWidth; // 记录行高 height += lineHeight; lineHeight = childHeight; } else // 未换行 { // 叠加行宽 lineWidth += childWidth; // 得到当前行最大的高度 lineHeight = Math.max(lineHeight, childHeight); } // 特殊情况,最后一个控件 if (i == cCount - 1) { width = Math.max(lineWidth, width); height += lineHeight; } } setMeasuredDimension( modeWidth == MeasureSpec.EXACTLY ? sizeWidth : width + getPaddingLeft() + getPaddingRight(), modeHeight == MeasureSpec.EXACTLY ? sizeHeight : height + getPaddingTop() + getPaddingBottom()// ); } /** * 存储所有的View */ private List<List<View>> mAllViews = new ArrayList<List<View>>(); /** * 每一行的高度 */ private List<Integer> mLineHeight = new ArrayList<Integer>(); @Override protected void onLayout(boolean changed, int l, int t, int r, int b) { mAllViews.clear(); mLineHeight.clear(); // 当前ViewGroup的宽度 int width = getWidth(); int lineWidth = 0; int lineHeight = 0; // 存放每一行的子view List<View> lineViews = new ArrayList<View>(); int cCount = getChildCount(); for (int i = 0; i < cCount; i++) { View child = getChildAt(i); MarginLayoutParams lp = (MarginLayoutParams) child .getLayoutParams(); int childWidth = child.getMeasuredWidth(); int childHeight = child.getMeasuredHeight(); // 如果需要换行 if (childWidth + lineWidth + lp.leftMargin + lp.rightMargin > width - getPaddingLeft() - getPaddingRight()) { // 记录LineHeight mLineHeight.add(lineHeight); // 记录当前行的Views mAllViews.add(lineViews); // 重置我们的行宽和行高 lineWidth = 0; lineHeight = childHeight + lp.topMargin + lp.bottomMargin; // 重置我们的View集合 lineViews = new ArrayList<View>(); } lineWidth += childWidth + lp.leftMargin + lp.rightMargin; lineHeight = Math.max(lineHeight, childHeight + lp.topMargin + lp.bottomMargin); lineViews.add(child); }// for end // 处理最后一行 mLineHeight.add(lineHeight); mAllViews.add(lineViews); // 设置子View的位置 int left = getPaddingLeft(); int top = getPaddingTop(); // 行数 int lineNum = mAllViews.size(); for (int i = 0; i < lineNum; i++) { // 当前行的所有的View lineViews = mAllViews.get(i); lineHeight = mLineHeight.get(i); for (int j = 0; j < lineViews.size(); j++) { View child = lineViews.get(j); // 判断child的状态 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(); // 为子View进行布局 child.layout(lc, tc, rc, bc); left += child.getMeasuredWidth() + lp.leftMargin + lp.rightMargin; } left = getPaddingLeft(); top += lineHeight; } } /** * 与当前ViewGroup对应的LayoutParams */ @Override public LayoutParams generateLayoutParams(AttributeSet attrs) { return new MarginLayoutParams(getContext(), attrs); } }
--------------------------MainActivity-------------------
import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.LayoutInflater; import android.view.View; import android.widget.TextView; public class MainActivity extends AppCompatActivity {
//定义个数组,把要显示的文字或者是数据写在里面 private String[] mVals = new String[] { "呵呵", "哈哈", "经典 ", "清纯", "特产", "性感", "宝宝", "手机" }; private LayoutInflater mInflater; private FlowLayout mFlowLayout; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mInflater = LayoutInflater.from(this); mFlowLayout = (FlowLayout) findViewById(R.id.id_flowlayout); initData(); } public void initData() { /** * 找到搜索标签的控件 */ for (int i = 0; i < mVals.length; i++) { TextView tv = (TextView) mInflater.inflate( R.layout.search_label_tv, mFlowLayout, false); tv.setText(mVals[i]); final String str = tv.getText().toString(); //点击事件 tv.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { } }); mFlowLayout.addView(tv);//添加到父View } } }
------------------下面是布局里面的代码---------------------------
activity_main
<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:layout_height="match_parent" tools:context="bwie.com.flowlayout.MainActivity"> <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:text="hello_world" /> <bwie.com.flowlayout.FlowLayout android:id="@+id/id_flowlayout" android:layout_width="match_parent" android:layout_height="wrap_content" android:background="#FFFFFF" android:padding="10dp"></bwie.com.flowlayout.FlowLayout> </RelativeLayout>----search_label_tv------------
<TextView xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_margin="5dp" android:textColor="#3f3e3e" android:background="@drawable/a1" android:textSize="14sp" android:text="Helloworld" android:padding="10dp"> </TextView>