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自定义一般分三种情况
1. 自定义布局
2. 自定义控件
3.直接继承View
下面来着eoe例子，实现自定义控件
1. 自定义属性
res/values/attrs.xml 自定义属性
<?xml version="1.0" encoding="utf-8"?> <resources> <declare-styleable name="progress"> <attr name="text" format="string" /> <attr name="textSize" format="dimension" /> </declare-styleable> </resources>
2. 自定义控件，实现带有 AttributeSet的构造方法
package com.test.uidemo; import android.content.Context; import android.content.res.TypedArray; import android.graphics.Canvas; import android.graphics.Paint; import android.util.AttributeSet; import android.util.Log; import android.widget.TextView; import com.test.uidemo.R; /** * 参考eoe书籍 * 自定义控件 * 实现用一个边框把文字包裹. */ public class MyTextView extends TextView { public MyTextView(Context context) { super(context); } public MyTextView(Context context, AttributeSet attrs) { super(context, attrs); TypedArray attr = context.obtainStyledAttributes(attrs, R.styleable.progress); setText(attr.getString(R.styleable.progress_text)); setTextSize(attr.getDimension(R.styleable.progress_textSize, 16)); Log.i("Text", attr.getString(R.styleable.progress_text)); } protected void onDraw(Canvas canvas){ super.onDraw(canvas); Paint paint = new Paint(); paint.setColor(android.graphics.Color.RED); canvas.drawLine(0,0,this.getWidth()-1,0,paint); canvas.drawLine(0,0,0,this.getHeight()-1,paint); canvas.drawLine(this.getWidth()-1,0,this.getWidth()-1,this.getHeight()-1,paint); canvas.drawLine(0,this.getHeight()-1,this.getWidth()-1,this.getHeight()-1,paint); } }
3. 使用自定义控件
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:progress="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context="com.test.uidemo.MainActivity"> <com.test.uidemo.MyTextView android:layout_width="match_parent" android:layout_height="wrap_content" progress:text="自定义" progress:textSize="30dp" android:layout_centerVertical="true" android:layout_alignParentRight="true" android:layout_alignParentEnd="true"> </com.test.uidemo.MyTextView> </RelativeLayout>
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原文地址：http://www.cnblogs.com/newlangwen/p/5357763.html
