android 自定义LinearLayout

接着上一篇，本篇玩一下自定义LinearLayout，直接上代码：

1. attr.xml

<?xml version="1.0" encoding="utf-8"?><resources>    <!-- MyTextView -->    <declare-styleable name="MyTextView">        <attr name="textColor" format="color" />        <attr name="textSize" format="dimension" />        <attr name="title" format="string" />    </declare-styleable>    <!-- MyLinearLayout -->    <declare-styleable name="MyLinearLayout">        <attr name="Text" format="reference|string"></attr>        <attr name="Orientation">            <enum name="Horizontal" value="1"></enum>            <enum name="Vertical" value="0"></enum>        </attr>    </declare-styleable></resources>

2.继承LinearLayout重新定义一个：

package com.test.customviewtest;import android.content.Context;import android.content.res.TypedArray;import android.util.AttributeSet;import android.widget.EditText;import android.widget.LinearLayout;import android.widget.TextView;public class MyLinearLayout extends LinearLayout {public MyLinearLayout(Context context, AttributeSet attrs) {super(context, attrs);int resouceId = -1;TypedArray MyTypeArray = context.obtainStyledAttributes(attrs,R.styleable.MyLinearLayout);TextView tv = new TextView(context);EditText et = new EditText(context);int N = MyTypeArray.getIndexCount();// N=2for (int i = 0; i < N; i++) {int attr = MyTypeArray.getIndex(i);switch (attr) {case R.styleable.MyLinearLayout_Text:resouceId = MyTypeArray.getResourceId(R.styleable.MyLinearLayout_Text, 0);tv.setText(resouceId > 0 ? MyTypeArray.getResources().getText(resouceId) : MyTypeArray.getString(R.styleable.MyLinearLayout_Text));break;case R.styleable.MyLinearLayout_Orientation:resouceId = MyTypeArray.getInt(R.styleable.MyLinearLayout_Orientation, 0);this.setOrientation(resouceId == 1 ? LinearLayout.HORIZONTAL: LinearLayout.VERTICAL);break;}}addView(tv);addView(et);MyTypeArray.recycle();}}

3.在activity_main.xml 布局中引用自定义LinearLayout：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:mycustomapp="http://schemas.android.com/apk/res/com.test.customviewtest"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent" >    <!-- 属性：textColor、textSize、title   是attr.xml中定义的 -->    <!-- <com.test.customviewtest.MyTextView -->    <!-- android:layout_width="wrap_content" -->    <!-- android:layout_height="wrap_content" -->    <!-- mycustomapp:textColor="#00ff00" -->    <!-- mycustomapp:textSize="30px" -->    <!-- mycustomapp:title="xml zhong de text" /> -->    <com.test.customviewtest.MyLinearLayout        android:layout_width="wrap_content"        android:layout_height="wrap_content"        mycustomapp:Orientation="Vertical"        mycustomapp:Text="this is custom LinearLayout" >    </com.test.customviewtest.MyLinearLayout></RelativeLayout>

4. MainActivity.java

 

package com.test.customviewtest;import android.app.Activity;import android.os.Bundle;public class MainActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);}}

内容很简单，就不作详细介绍了，看一下demo基本就会搞了！！