Android自定View流式布局根据文字数量换行

package com.example.customwaterfallviewgroup;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.EditText;import java.util.ArrayList;import java.util.List;public class MainActivity extends AppCompatActivity {  List<String> stringList = new ArrayList<>();  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    initView();  }  private void initView() {    final EditText editText = findViewById(R.id.edit);    final CustomWaterFallViewGroup customWaterFallViewGroup = findViewById(R.id.water_fill);    findViewById(R.id.button).setOnClickListener(new View.OnClickListener() {      @Override      public void onClick(View v) {        //获取输入框的值        String str = editText.getText().toString();        //将文字放入列表        stringList.add(str);        //设置数据        customWaterFallViewGroup.setData(stringList);      }    });  }}

<?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="wrap_content"  android:orientation="vertical"  tools:context=".MainActivity">  <EditText    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:id="@+id/edit"    android:hint="输入"    />  <Button    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:id="@+id/button"    android:text="add"    />  <com.example.customwaterfallviewgroup.CustomWaterFallViewGroup    android:layout_width="match_parent"    android:layout_height="match_parent"    android:id="@+id/water_fill"    /></LinearLayout>

package com.example.customwaterfallviewgroup;import android.content.Context;import android.graphics.Canvas;import android.util.AttributeSet;import android.util.DisplayMetrics;import android.view.View;import android.view.ViewGroup;import android.widget.LinearLayout;import android.widget.TextView;import android.widget.Toast;import java.util.ArrayList;import java.util.List;public class CustomWaterFallViewGroup extends LinearLayout {  //设置每一行最大的字符串的长度  int mMaxSize = 22;  //传入的字符串数组  List<String> stringList = new ArrayList<>();  Context mcontext;  public CustomWaterFallViewGroup(Context context) {    super(context);    mcontext = context;    init();  }  public CustomWaterFallViewGroup(Context context,AttributeSet attrs) {    super(context, attrs);    mcontext = context;    init();  }  //定义布局  private void init() {    //设置最外层的LinearLayout 为垂直布局    setOrientation(VERTICAL);  }  @Override  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {    super.onMeasure(widthMeasureSpec, heightMeasureSpec);    DisplayMetrics displayMetrics = mcontext.getResources().getDisplayMetrics();    int widthPixels = displayMetrics.widthPixels;    setMeasuredDimension(widthPixels,heightMeasureSpec);  }  @Override  protected void onLayout(boolean changed, int l, int t, int r, int b) {    super.onLayout(changed, l, t, r, b);  }  @Override  protected void onDraw(Canvas canvas) {    super.onDraw(canvas);  }  public void setData(List<String> stringList) {    //上一个输入框里的数据存到这个页面的集合中     this.stringList = stringList;    showData();  }  private void showData() {    //因为每一次都要重新画 ，所以移除之前的布局 显示更新过的布局    removeAllViews();    //优先向跟布局添加一条横向布局    LinearLayout linearLayout_h = (LinearLayout) View.inflate(mcontext,R.layout.item_water_fall_h,null);    addView(linearLayout_h);    //定义临时变量。用来计算最后一行已有的字符长度    int len = 0;    for (int i = 0;i<stringList.size();i++){      String str = stringList.get(i);      //将次字符串长度与记录的已有字符串长度相加      len += str.length();      //-判断 如果大于最大长度，说明这一行放不下了      //需要自动换行      if (len > mMaxSize){        //像跟布局添加一条横布局        linearLayout_h = (LinearLayout) View.inflate(mcontext,R.layout.item_water_fall_h,null);        addView(linearLayout_h);        //换行以后因为不添加了 所以 当前的救是最后一行的长度        len = str.length();      }      //添加一个textView控件      View view = View.inflate(mcontext,R.layout.water_fall_textview,null);      //获取到它的ID      TextView textView = view.findViewById(R.id.water_fall_textview);      //得到后给它赋值 （输入框里的值 给它）      textView.setText(str);      //添加到布局中      linearLayout_h.addView(view);      //设置权重 让每一行内所有的控件相加充满整行，并合理分配      LinearLayout.LayoutParams layoutParams = (LinearLayout.LayoutParams) view.getLayoutParams();      layoutParams.weight = 1;      view.setLayoutParams(layoutParams);      final int index = i;      view.setOnClickListener(new OnClickListener() {        @Override        public void onClick(View v) {          Toast.makeText(mcontext,"您点击了"+stringList.get(index),Toast.LENGTH_SHORT).show();        }      });      view.setOnLongClickListener(new OnLongClickListener() {        @Override        public boolean onLongClick(View v) {          stringList.remove(index);          showData();          return false;        }      });    }  }}

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  android:id="@+id/water_fall_h"  android:layout_width="match_parent"  android:layout_height="wrap_content"  android:orientation="horizontal"></LinearLayout>

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  android:layout_width="match_parent"  android:layout_height="wrap_content"  android:orientation="horizontal"  >  <TextView    android:id="@+id/water_fall_textview"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:background="@color/colorAccent"    android:layout_weight="1"    android:textSize="20dp"    android:layout_marginRight="5dp"    android:layout_marginLeft="5dp"    android:layout_marginTop="10dp"    android:gravity="center"    /></LinearLayout>