自定义ViewGroup实现换行

1.AutoViewGroup

package com.example.yangdechengapplication.view;

import android.content.Context;
import android.util.AttributeSet;
import android.util.DisplayMetrics;
import android.view.View;
import android.view.ViewGroup;

public class AutoViewGroup extends ViewGroup {
    private int mScreenWidth;//屏幕的宽度
    private int mHorizontalSpacing;//横向的自view的间距
    private int mVerticalSpacing;//行间距

    public AutoViewGroup(Context context) {
        super(context);
    }

    public AutoViewGroup(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public void setSpacing(int horizontalSpacing, int verticalSpacing) {
        mHorizontalSpacing = horizontalSpacing;
        mVerticalSpacing = verticalSpacing;
    }

    private void init() {
        DisplayMetrics dm = getResources().getDisplayMetrics();
        mScreenWidth = dm.widthPixels;
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        int widthSize = MeasureSpec.getSize(widthMeasureSpec);
        int heightSize = MeasureSpec.getSize(heightMeasureSpec);
        //也可以根据根据孩子的大小计算出自身的宽高

        ////根据自身的宽度约束子控件宽度
        measureChildren(widthMeasureSpec, heightMeasureSpec);
        //设置自身宽度(默认的宽高是充满屏幕的)
        setMeasuredDimension(widthSize, heightSize);
    }

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        int mTotalHeight = 0;
        int mTotalWidth = 0;
        int mTempHeight = 0;
        int childCount = getChildCount();
        for (int i = 0; i < childCount; i++) {
            View childView = getChildAt(i);
            int measureHeight = childView.getMeasuredHeight();
            int measuredWidth = childView.getMeasuredWidth();
            mTempHeight = (measureHeight > mTempHeight) ? measureHeight : mTempHeight;
            if ((measuredWidth + mTotalWidth + mHorizontalSpacing) > mScreenWidth) {
                mTotalWidth = 0;
                mTotalHeight += (mTempHeight + mVerticalSpacing);
                mTempHeight = 0;
            }
            childView.layout(mTotalWidth + mHorizontalSpacing, mTotalHeight, measuredWidth + mTotalWidth + mHorizontalSpacing, mTotalHeight + measureHeight);
            mTotalWidth += (measuredWidth + mHorizontalSpacing);
            int a=0;
            String x="";


        }
    }
}

2.Activity

package com.example.yangdechengapplication.customview;

import android.content.Context;
import android.graphics.Color;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.TypedValue;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import android.widget.Toast;

import com.example.yangdechengapplication.R;
import com.example.yangdechengapplication.view.AutoViewGroup;

import java.util.ArrayList;


public class CustomviewActivity extends AppCompatActivity {
    private ArrayList<String> mData = new ArrayList<>();
    private Context mContext;
    private AutoViewGroup autoBreakViewGroup;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mContext = this;
        setContentView(R.layout.activity_customview_test);
        autoBreakViewGroup = (AutoViewGroup) findViewById(R.id.autoBreakViewGroup);
        autoBreakViewGroup.setSpacing(20, 20);
        initView();
    }

    private void initView() {
        mData.add("猪八戒");
        mData.add("刘备");
        mData.add("无能");
        mData.add("旋风少女");
        mData.add("孙悟空");
        mData.add("拉玛西亚");

        for (int i = 0; i < mData.size(); i++) {
            TextView textView = new TextView(mContext);
            textView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    Toast.makeText(getApplicationContext(), "Toast在其他线程中调用显示", Toast.LENGTH_SHORT).show();

                }

            });
            textView.setText(mData.get(i));
            textView.setTextSize(TypedValue.COMPLEX_UNIT_DIP, 16);
            textView.setTextColor(Color.BLACK);
            textView.setLayoutParams(new
                    ViewGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT));
            textView.setBackgroundResource(R.drawable.btn_radius_blue_bg);
            textView.setPadding(20, 10, 20, 10);
            textView.setGravity(Gravity.CENTER);
            autoBreakViewGroup.addView(textView);
        }
    }

}

3.XML布局

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:custom="http://schemas.android.com/apk/res/com.example.yangdechengapplication"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <com.example.yangdechengapplication.view.CustomTitleView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        custom:titleText="3712"
        android:padding="10dp"
        custom:titleTextColor="#ff0000"
        android:layout_centerInParent="true"
        custom:titleTextSize="40sp"  />

</RelativeLayout>