超简单 自定义流式布局

//样子丑了点，但是可以自己改

//随便创个类继承viewgroup实现它的四个方法
public class FlowLayout extends ViewGroup {
    //继承viewgroup重写构造方法
    public FlowLayout(Context context) {
        super(context);
    }

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

    public FlowLayout(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    public FlowLayout(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);

    }

    //绘制
    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
    }

    //测量
    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        //测量子宽高
        measureChildren(widthMeasureSpec, heightMeasureSpec);
    }

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        int width = getWidth();//获取宽
        int row = 0;//定义常量
        int dieth = 18;//左边距

        for (int i = 0; i < getChildCount(); i++) {
//            坐标
            View view = getChildAt(i);
            int viewwidth = view.getMeasuredWidth();//宽
            int viewheight = view.getMeasuredHeight();//高
            //判断
            if (dieth + viewwidth > width) {
                row++;
                dieth = 18;
            }
            //左上右下
            view.layout(dieth, row * viewheight, viewwidth + dieth, viewheight * (row + 1));
            dieth += viewwidth;
        }
    }
}
//在你需要的布局文件里面定义FlowLayout类的全路径
<com.bawei.liushi.FlowLayout
    android:id="@+id/liushi"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

</com.bawei.liushi.FlowLayout>
///主页面
liushi = findViewById(R.id.liushi);
//清空流式布局
findViewById(R.id.delete).setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        liushi.removeAllViews();
        Toast.makeText(MainActivity.this, "删除成功", Toast.LENGTH_SHORT).show();
    }
});
//点击按钮添加到流式布局
bt_s.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        String text = et_s.getText().toString().trim();
        final TextView textView = new TextView(MainActivity.this);
        textView.setText(text);
        final ViewGroup.MarginLayoutParams params = new ViewGroup.MarginLayoutParams(ViewGroup.MarginLayoutParams.WRAP_CONTENT, ViewGroup.MarginLayoutParams.WRAP_CONTENT);
        liushi.addView(textView, params);
        textView.setBackgroundResource(R.drawable.sha);
        textView.setTextSize(20);
        textView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String trim = textView.getText().toString().trim();
                Toast.makeText(MainActivity.this, ""+trim, Toast.LENGTH_SHORT).show();
            }
        });