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在日常的app使用中,我们会在android 的app中看见热门标签等自动换行的流式布局,今天就为大家分享一种android流式布局的实现。
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先看最终效果
自定义流式布局的实现
package com.sunny.flowlayout.view; import java.util.ArrayList; import java.util.List; import android.content.Context; import android.util.AttributeSet; import android.util.Log; import android.view.View; import android.view.ViewGroup; public class FlowLayout extends ViewGroup { public FlowLayout(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); } public FlowLayout(Context context, AttributeSet attrs) { this(context, attrs, 0); } public FlowLayout(Context context) { this(context, null); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { int sizeWidth = MeasureSpec.getSize(widthMeasureSpec); int modeWidth = MeasureSpec.getMode(widthMeasureSpec); int sizeHeight = MeasureSpec.getSize(heightMeasureSpec); int modeHeight = MeasureSpec.getMode(heightMeasureSpec); // wrap_content 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++) { View child = getChildAt(i); // 测量子View的宽和高 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 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); } // 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> mAllViews = new ArrayList
>(); /** * 每一行的高度 */ private List
mLineHeight = new ArrayList (); @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; List lineViews = new ArrayList (); 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 (); } 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); } }
流式布局代码实现的注释还算比较详细,请参考具体代码及注释说明。
流式布局xml文件
主页面Activity的实现
package com.sunny.flowlayout; import com.sunny.flowlayout.view.FlowLayout; import android.R.mipmap; import android.os.Bundle; import android.app.ActionBar.LayoutParams; import android.app.Activity; import android.view.LayoutInflater; import android.view.Menu; import android.view.ViewGroup.MarginLayoutParams; import android.widget.Button; import android.widget.TextView; public class FlowLayoutActivity extends Activity { private FlowLayout mFlowLayout; private String[] mVals =new String[]{ "Hello","Android","Welcome","Music","Sport","Working", "Game","Fishing","Shopping","Music Singing","Sport happy", "Working Hard","Game Team","Fishing river","Shopping more" }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_flow_layout); mFlowLayout = (FlowLayout) findViewById(R.id.id_flowlayout); initData(); } //初始化数据 public void initData(){ LayoutInflater mInflater = LayoutInflater.from(this); for (int i = 0; i < mVals.length; i++) { TextView tv = (TextView) mInflater.inflate(R.layout.tv, mFlowLayout, false); tv.setText(mVals[i]); mFlowLayout.addView(tv); } } }
TextView布局xml文件
为TextView设置背景样式
今天是第一次写博客,今天是开始,我会一直坚持下去,欢迎大家一块交流学习
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