安卓开发学习之006 LinearLayout.LayoutParams详解

来源：互联网发布：手机怎么注册淘宝网店编辑：程序博客网时间：2024/05/01 14:41

本文主要讲解两个知识点：
1.LinearLayout.LayoutParams使用说明
2.在Java代码中利用LinearLayout.LayoutParams构建布局

1.继承关系

这里写图片描述

2.主要构造方法

1.LinearLayout.LayoutParams(int width, int height)
指定宽度和高度
2.LinearLayout.LayoutParams(int width, int height, float weight)
指定宽度、高度和权重

3.还是看代码比较直观

package com.antex.linearLayout.layoutParams;import android.os.Bundle;import android.support.v4.app.Fragment;import android.view.Gravity;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.Button;import android.widget.LinearLayout;/** * LinearLayout.LayoutParams 使用说明 * 用JAVA代码构建布局. */public class LinearLayout_LayoutParamsActivityFragment extends Fragment {    private LinearLayout.LayoutParams params;    public LinearLayout_LayoutParamsActivityFragment() {    }    @Override    public View onCreateView(LayoutInflater inflater, ViewGroup container,                             Bundle savedInstanceState) {        LinearLayout linearLayout = new LinearLayout(getContext());        //设置布局方向        linearLayout.setOrientation(LinearLayout.HORIZONTAL);        //父LinearLayout LayoutParams        LinearLayout.LayoutParams parentparams = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PARENT);        linearLayout.setLayoutParams(parentparams);        //子控件的LayoutParams        // 宽度为0,高度为WRAP_CONTENT,权重为1,权重也可以不指定        params = new LinearLayout.LayoutParams(0, LinearLayout.LayoutParams.WRAP_CONTENT, 1);        //设置控件的显示位置,相当于控件的layout_gravity属性        params.gravity= Gravity.CENTER;        //设置控件margin值        params.leftMargin=10;        params.rightMargin=10;        params.bottomMargin=10;        params.topMargin=10;        addView(4, linearLayout);        return linearLayout;    }    /**     * 添加按钮到容器中     * @param count        添加按钮总个数     * @param linearLayout 按钮所在的父容器     */    private void addView(int count, LinearLayout linearLayout) {        for (int i = 1; i <= count; i++) {            Button button = new Button(getContext());            button.setText("Button" + i);            //设置按钮内文本内容显示位置            //button.setGravity(Gravity.LEFT);            linearLayout.addView(button, params);        }    }}

开发工具：Android Studio1.4
SDK: Android 6.0
API 23

代码下载：LayoutParams.zip

0 0