一、自定義流式佈局

public class CustomView extends ViewGroup {

    private int mleftMargin=20;
    private int mtopMargin=20;

    public CustomView(Context context) {
        this(context,null);
    }

    public CustomView(Context context, AttributeSet attrs) {
        this(context, attrs,0);
    }

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

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        measureChildren(widthMeasureSpec,heightMeasureSpec);

        int leftMargin = mleftMargin;
        int topMargin = mtopMargin;

        int sizeWidth = MeasureSpec.getSize(widthMeasureSpec);
        int modeHeight = MeasureSpec.getMode(heightMeasureSpec);

        switch (modeHeight){
            case MeasureSpec.AT_MOST:
                int measuredHeight = 0;
                for (int j = 0; j < getChildCount(); j++) {
                    int measuredWidth = getChildAt(j).getMeasuredWidth();
                    measuredHeight = getChildAt(j).getMeasuredHeight();
                    if (leftMargin+measuredWidth+mleftMargin>getWidth()){
                        leftMargin=mleftMargin;
                        topMargin+=measuredHeight+mtopMargin;
                    }
                    leftMargin+=measuredWidth+mleftMargin;
                }
                topMargin+=measuredHeight+mtopMargin;
                break;
        }
        setMeasuredDimension(sizeWidth,topMargin);
    }

    @Override
    protected void onLayout(boolean b, int i, int i1, int i2, int i3) {
        int leftMargin = mleftMargin;
        int topMargin = mtopMargin;

        for (int j = 0; j < getChildCount(); j++) {
            int measuredWidth = getChildAt(j).getMeasuredWidth();
            int measuredHeight = getChildAt(j).getMeasuredHeight();
            if (leftMargin+measuredWidth+mleftMargin>getWidth()){
                leftMargin=mleftMargin;
                topMargin+=measuredHeight+mtopMargin;
                getChildAt(j).layout(leftMargin,topMargin,leftMargin+measuredWidth,topMargin+measuredHeight);
            }else {
                getChildAt(j).layout(leftMargin,topMargin,leftMargin+measuredWidth,topMargin+measuredHeight);
            }
            leftMargin+=measuredWidth+mleftMargin;
        }
    }
}
 

二、自定義加減

public class MyJIaJianView extends LinearLayout{
    private TextView jiaTv,jiantv;
    private EditText numEt;
    private int num = 1;


    public MyJIaJianView(Context context) {
        this(context,null);
    }

    public MyJIaJianView(Context context, @Nullable AttributeSet attrs) {
        this(context, attrs,0);
    }

    public MyJIaJianView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init(context);
    }

    private void init(Context context) {
        View view = LayoutInflater.from(context).inflate(R.layout.jia_jian_layout,this,true);
        jiaTv = (TextView) view.findViewById(R.id.jia);
        jiantv = (TextView) view.findViewById(R.id.jian);
        numEt = (EditText) view.findViewById(R.id.num);

        numEt.setText(num+"");
        jiaTv.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                num++;
                numEt.setText(num+"");
                if (jiaJianListener!=null){
                    jiaJianListener.getNum(num);
                }
            }
        });

        jiantv.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                num--;
                if (num<=0){
                    Toast.makeText(getContext(),"數量不能小於1",Toast.LENGTH_SHORT).show();
                    num = 1;
                }
                numEt.setText(num+"");
                if (jiaJianListener!=null){
                    jiaJianListener.getNum(num);
                }
            }
        });
    }

    public void setNumEt(int n){
        numEt.setText(n+"");
        num = Integer.parseInt(numEt.getText().toString());
    }

    private JiaJianListener jiaJianListener;

    public void setJiaJianListener(JiaJianListener jiaJianListener){
        this.jiaJianListener = jiaJianListener;
    }

    public interface JiaJianListener{
        void getNum(int num);
    }
}