自定義 流式佈局實現
首先佈局得清晰--建立一個自定義控制元件 <com.example.mr.flow android:id="@+id/ffff" android:layout_width="match_parent" android:layout_height="100dp"> 其次設定你自己想要的的shape佈局 <?xml version="1.0" encoding="utf-8"?> <shape xmlns:android="http://schemas.android.com/apk/res/android"> <solid android:color="#666666"/> <corners android:radius="10dp"/> <padding android:left="5dp" android:right="5dp" android:top="5dp" android:bottom="5dp"/> </shape> //然後開始寫你自定義的ViewGroup package com.example.mr;
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 Mr趙 on 2017/12/2. */
public class flow extends ViewGroup { //儲存所有子View private List<List<View>> mAllChildViews = new ArrayList<>(); //每一行的高度 private List<Integer> mLineHeight = new ArrayList<>();
public flow(Context context) { this(context, null); }
public flow(Context context, AttributeSet attrs) { this(context, attrs, 0); }
public flow(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); }
@Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { //父控制元件傳進來的寬度和高度以及對應的測量模式 int sizeWidth = MeasureSpec.getSize(widthMeasureSpec); int modeWidth = MeasureSpec.getMode(widthMeasureSpec); int sizeHeight = MeasureSpec.getSize(heightMeasureSpec); int modeHeight = MeasureSpec.getMode(heightMeasureSpec); //如果當前ViewGroup的寬高為wrap_content的情況 int width = 0;//自己測量的 寬度 int height = 0;//自己測量的高度 //記錄每一行的寬度和高度 int lineWidth = 0; int lineHeight = 0;
//獲取子view的個數 int childCount = getChildCount();
for (int i = 0; i < childCount; i++) { View child = getChildAt(i); //測量子View的寬和高 measureChild(child, widthMeasureSpec, heightMeasureSpec); //得到LayoutParams MarginLayoutParams lp = (MarginLayoutParams) getLayoutParams(); //子View佔據的寬度 int childWidth = child.getMeasuredWidth() + lp.leftMargin + lp.rightMargin; //子View佔據的高度 int childHeight = child.getMeasuredHeight() + lp.topMargin + lp.bottomMargin; //換行時候 if (lineWidth + childWidth > sizeWidth) { //對比得到最大的寬度 width = Math.max(width, lineWidth); //重置lineWidth lineWidth = childWidth; //記錄行高 height += lineHeight; lineHeight = childHeight; } else {//不換行情況 //疊加行寬 lineWidth += childWidth; //得到最大行高 lineHeight = Math.max(lineHeight, childHeight); } //處理最後一個子View的情況 if (i == childCount - 1) { width = Math.max(width, lineWidth); height += lineHeight; } } //wrap_content setMeasuredDimension(modeWidth == MeasureSpec.EXACTLY ? sizeWidth : width, modeHeight == MeasureSpec.EXACTLY ? sizeHeight : height); super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
@Override protected void onLayout(boolean changed, int l, int t, int r, int b) { mAllChildViews.clear(); mLineHeight.clear(); //獲取當前ViewGroup的寬度 int width = getWidth();
int lineWidth = 0; int lineHeight = 0; //記錄當前行的view List<View> lineViews = new ArrayList<View>(); int childCount = getChildCount(); for (int i = 0; i < childCount; i++) { View child = getChildAt(i); MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); int childWidth = child.getMeasuredWidth(); int childHeight = child.getMeasuredHeight();
//如果需要換行 if (childWidth + lineWidth + lp.leftMargin + lp.rightMargin > width) { //記錄LineHeight mLineHeight.add(lineHeight); //記錄當前行的Views mAllChildViews.add(lineViews); //重置行的寬高 lineWidth = 0; lineHeight = childHeight + lp.topMargin + lp.bottomMargin; //重置view的集合 lineViews = new ArrayList(); } lineWidth += childWidth + lp.leftMargin + lp.rightMargin; lineHeight = Math.max(lineHeight, childHeight + lp.topMargin + lp.bottomMargin); lineViews.add(child); } //處理最後一行 mLineHeight.add(lineHeight); mAllChildViews.add(lineViews);
//設定子View的位置 int left = 0; int top = 0; //獲取行數 int lineCount = mAllChildViews.size(); for (int i = 0; i < lineCount; i++) { //當前行的views和高度 lineViews = mAllChildViews.get(i); lineHeight = mLineHeight.get(i); for (int j = 0; j < lineViews.size(); j++) { View child = lineViews.get(j); //判斷是否顯示 if (child.getVisibility() == View.GONE) { continue; } MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); int cLeft = left + lp.leftMargin; int cTop = top + lp.topMargin; int cRight = cLeft + child.getMeasuredWidth(); int cBottom = cTop + child.getMeasuredHeight(); //進行子View進行佈局 child.layout(cLeft, cTop, cRight, cBottom); left += child.getMeasuredWidth() + lp.leftMargin + lp.rightMargin; } left = 0; top += lineHeight; }
}
/** * 與當前ViewGroup對應的LayoutParams */ @Override public LayoutParams generateLayoutParams(AttributeSet attrs) { // TODO Auto-generated method stub
return new MarginLayoutParams(getContext(), attrs);
} } //寫完之後Activity中呼叫就可以 這是建立的陣列用於現實的內容 private String mNames[] = { "硬碟螺絲","老人機","海爾冰箱", "電視機","旅遊用品","家備小電器", "服飾" }; 調取此方法可以使用 private void initChildViews() { flowLayout = findViewById(R.id.ffff); ViewGroup.MarginLayoutParams lp = new ViewGroup.MarginLayoutParams( ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT); lp.leftMargin = 5; lp.rightMargin = 5; lp.topMargin = 5; lp.bottomMargin = 5; for(int i = 0; i < mNames.length; i ++){ TextView view = new TextView(this); view.setText(mNames[i]); view.setTextColor(Color.WHITE); view.setBackgroundDrawable(getResources().getDrawable(R.drawable.textview_bg)); flowLayout.addView(view,lp); }
} 作者：黑暗中的鬼 來源：CSDN 原文：https://blog.csdn.net/Mrzhaoplus/article/details/78700539 版權宣告：本文為博主原創文章，轉載請附上博文連結！