package example.com.niuyuejiao; import android.content.Context; import android.util.AttributeSet; import android.view.View; import android.view.ViewGroup; import java.util.ArrayList; import java.util.List; /** * author:Created by niuyuejiao on 2018/4/16. */ public class MyView extends ViewGroup { //每行的高度 private List<Integer> mLineHeight = new ArrayList<>(); //储存所有的子view private List<List<View>> mAllChildViews = new ArrayList<>(); public MyView(Context context) { this(context, null); } public MyView(Context context, AttributeSet attrs) { this(context, attrs, 0); } public MyView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { //测量宽度 int sizeWidth = MeasureSpec.getSize(widthMeasureSpec); int modeWidth = MeasureSpec.getMode(widthMeasureSpec); //测量高度 int sizeheight = MeasureSpec.getSize(heightMeasureSpec); int modeheight = MeasureSpec.getMode(heightMeasureSpec); //如果宽高为wrap_content的情况 int width = 0; int height = 0; //记录每一行的宽高 int lineWidth = 0; int lineHeight = 0; //获取一个view的个数 int childCount = getChildCount(); //循环获得每个view的数值 for (int i = 0; i < childCount; i++) { View child = getChildAt(i); //测量子View的宽高 measureChild(child, widthMeasureSpec, heightMeasureSpec); //得到LayoutParams MarginLayoutParams lp = (MarginLayoutParams) getLayoutParams(); //子View 占据的宽度 int childWidth = child.getMeasuredWidth() + lp.leftMargin + lp.rightMargin; //子View占据的高 int childHeight = child.getMeasuredHeight() + lp.topMargin + lp.bottomMargin; //换行的时候 if (lineWidth + childWidth > sizeWidth) { //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 { //叠加行宽 lineWidth += childWidth; //得到最大行高 lineHeight = Math.max(lineHeight, childHeight); } //处理最后一个子View 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); } //设置布局 @Override protected void onLayout(boolean b, int i, int i1, int i2, int i3) { mAllChildViews.clear(); mLineHeight.clear(); //获得当前ViewGroup的宽度 int width = getWidth(); int lineWidth = 0; int lineHeight = 0; // 记录当前行的View List<View> lineViews = new ArrayList<View>(); int childCount = getChildCount(); for (int f = 0; f < childCount; f++) { View child = getChildAt(f); 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) { //记录LineHeight mLineHeight.add(lineHeight); //记录当前的Views mAllChildViews.add(lineViews); //重置行高 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); } //处理最后一行 mLineHeight.add(lineHeight); mAllChildViews.add(lineViews); //设置子View的位置 int left = 20; int top = 100; //获取行数 int lineCount = mAllChildViews.size(); for (int d = 0; d < lineCount; d++) { //当前行的Views和高度 lineViews = mAllChildViews.get(d); lineHeight = mLineHeight.get(d); for (int j = 0; j < lineViews.size(); j++) { View child = lineViews.get(j); //判断是否显示 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(); //进行子View进行布局 child.layout(cLeft, cTop, cRight, cBottom); left += child.getMeasuredWidth() + lp.leftMargin + lp.rightMargin; } left = 20; top += lineHeight; } } /** * 与当前ViewGroup对应的LayoutParams */ @Override public LayoutParams generateLayoutParams(AttributeSet attrs) { // TODO Auto-generated method stub return new MarginLayoutParams(getContext(), attrs); } }
ackage example.com.niuyuejiao; import android.graphics.Color; import android.os.Bundle; import android.view.View; import android.view.ViewGroup; import android.widget.Button; import android.widget.EditText; import android.widget.ImageView; import android.widget.TextView; public class MainActivity extends BaseActivity { private String[] datas = {"笔记本", "空气净化器", "安卓手机", "超级大号圆珠笔", "空气滤芯", "超级大号钢笔"}; private Button clear; private MyView main_view; private EditText editText; private ImageView add; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); main_view = findViewById(R.id.main_view); 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 < datas.length; i++) { TextView textView = new TextView(MainActivity.this); textView.setText(datas[i]); textView.setTextColor(Color.BLUE); textView.setTextSize(18); textView.setBackgroundResource(R.drawable.seleter); main_view.addView(textView, lp); } }
<?xml version="1.0" encoding="utf-8"?> <LinearLayout 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" android:orientation="vertical" tools:context="example.com.niuyuejiao.MainActivity"> <example.com.niuyuejiao.MyView android:id="@+id/main_view" android:layout_width="wrap_content" android:layout_height="wrap_content"> </example.com.niuyuejiao.MyView> </LinearLayout>