Android : 自定义View之流式布局

写了一个很简单的布局
这是周围圆框的drawable

xml的布局

自定义View的代码

package com.example.administrator.rikao1130.floatview;


import android.content.Context;
import android.graphics.Color;
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 com.example.administrator.rikao1130.R;

public class MyFloatLayout extends LinearLayout {
    private final int widthPixels;
    public MyFloatLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
        DisplayMetrics metrics = context.getResources().getDisplayMetrics();
        widthPixels = metrics.widthPixels;
        //设置布局垂直显示
        setOrientation(VERTICAL);
    }
    
    public void setData(String[] data) {
        LinearLayout linearLayout = getLin();
        for (int i = 0; i < data.length; i++) {
            String tmp = data[i];
            int numWidth = 0;
            //得到一行LinearLayout到底有多少子控件  因为我要计算每个子控件加在一起的宽度
            int childCount = linearLayout.getChildCount();
            //这个for循环只是计算一行LinearLayout的所有子控件的宽的和
            for (int j = 0; j < childCount; j++) {
                //通过index得到每一个子控件
                TextView tv = (TextView) linearLayout.getChildAt(j);
                LayoutParams layoutParams = (LayoutParams) tv.getLayoutParams();
                int leftMargin = layoutParams.leftMargin;
                //测量这个tv的宽和高
                tv.measure(getMeasuredWidth(), getMeasuredHeight());
                numWidth += tv.getMeasuredWidth() + leftMargin + tv.getPaddingLeft() + getPaddingRight();
            }
            
            TextView dataText = getText();
            //设置文字属性
            LayoutParams params = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
            params.leftMargin = 20;
            params.topMargin = 2;
            dataText.setLayoutParams(params);
            dataText.setText(tmp);
            dataText.measure(getMeasuredWidth(), getMeasuredHeight());
            //计算宽
            int dataTextWidth = dataText.getMeasuredWidth() + dataText.getPaddingLeft() + dataText.getPaddingRight();
            //考虑到字符串可能会很长,超过屏幕的宽度,此处进行一个判断
            if (dataTextWidth >= widthPixels) {
                String substring = tmp.substring(0, 6);
                dataText.setText(substring + "...");
                //重新计算字符串的宽度
                dataText.measure(getMeasuredWidth(), getMeasuredHeight());
                dataTextWidth = dataText.getMeasuredWidth();
            }
            if (widthPixels >= numWidth + dataTextWidth) {
                linearLayout.addView(dataText);
            } else {
                //对LinearLayout重新赋值,通过getLin换行
                linearLayout = getLin();
                linearLayout.addView(dataText);
            }
        }
    }
    
    private TextView getText() {
        TextView textView = new TextView(getContext());
        textView.setTextSize(24);
        textView.setTextColor(Color.RED);
        textView.setBackgroundResource(R.drawable.text_style);
        textView.setPadding(10, 20, 10, 20);
        return textView;
    }
    
    private LinearLayout getLin() {
        LinearLayout linearLayout = new LinearLayout(getContext());
        //LayoutParams 控制组件大小的一个工具类
        LayoutParams params = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
        linearLayout.setLayoutParams(params);
        //this本类对象
        this.addView(linearLayout);//只要重新添加view了自动换行了
        return linearLayout;
    }
}

mineActivity的代码

package com.example.administrator.rikao1130;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;

import com.example.administrator.rikao1130.floatview.MyFloatLayout;

public class MainActivity extends AppCompatActivity {
    private String[] data = {"BigFly最帅", "最帅的是BigFly","BigFly帅", "最帅BigFly","BigFly最帅", "最帅的是BigFly","BigFly最帅", "最帅的是BigFly", "BigFly怎么那么帅,特别特别特别特别特别特别特别帅"};
    private MyFloatLayout My;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();

    }

    private void initView() {
        My = (MyFloatLayout) findViewById(R.id.My);
        My.setData(data);
    }
}

以上