view的自动换行

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package myview;

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

public class MyViewGroup extends ViewGroup {

    private final static String TAG = "MyViewGroup";
    private final static int VIEW_MARGIN = 15;
    public MyViewGroup(Context context) {
        super(context);
    }
    public MyViewGroup(Context context, AttributeSet attrs) {
        super(context, attrs);
    }
    public MyViewGroup(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

        int height = 0;
        Log.d(TAG, "widthMeasureSpec = " + widthMeasureSpec + " heightMeasureSpec" + heightMeasureSpec);
        int x = 0;
        int row = 1;
        for (int index = 0; index < getChildCount(); index++) {
            final View child = getChildAt(index);
            // measure
            child.measure(MeasureSpec.UNSPECIFIED, MeasureSpec.UNSPECIFIED);
            int h = child.getMeasuredHeight();
            int width = child.getMeasuredWidth();
            x += width;
            int measure = MeasureSpec.makeMeasureSpec(x, MeasureSpec.EXACTLY);
            if (measure > widthMeasureSpec) {
                x = 0;
                row++;
            }
            height = row * (VIEW_MARGIN + h);
        }
        heightMeasureSpec = MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY);
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    }

    @Override
    protected void onLayout(boolean arg0, int arg1, int arg2, int arg3, int arg4) {
        final int count = getChildCount();
        int row = 0;// which row lay you view relative to parent
        int lengthX = arg1;    // right position of child relative to parent
        int lengthY = arg2;    // bottom position of child relative to parent
        for (int i = 0; i < count; i++) {
            final View child = this.getChildAt(i);
            int width = child.getMeasuredWidth();
            int height = child.getMeasuredHeight();
            lengthX += width + VIEW_MARGIN;
            lengthY = row * (height + VIEW_MARGIN);
            //if it can‘t drawing on a same line , skip to next line
            Log.d(TAG, " left = " + (lengthX - width) + " top = " + (lengthY - height) + " right = " + lengthX + " botom = " + lengthY);
            Log.d(TAG, " width " + width + " height = " + height);
            if (lengthX > arg3) {
                lengthX = width + VIEW_MARGIN + arg1;
                row++;
                lengthY = row * (height + VIEW_MARGIN);
            }
            child.layout(lengthX - width, lengthY, lengthX, lengthY + height);
        }

    }
}

view的自动换行

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原文地址：http://www.cnblogs.com/crazysun/p/4315991.html