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                大家好我們今天的教程是在**Android**教程中自定義**View**的學習,對于初學著來說,他們習慣了**Android**傳統的頁面布局方式,如下代碼: ~~~ <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/hello" /> </LinearLayout> ~~~ ? 當然上面的布局方式可以幫助我們完成簡單應用的開發了,但是如果你想寫一個復雜的應用,這樣就有點牽強了,大家不信可以下源碼都研究看看,高手寫的布局方式,如上面的布局高手通常是這樣寫的: ? <?xml version="1.0" encoding="utf-8"?><A> <B></B></A> 其中A extends LinerLayout, B extends TextView. ? 為了幫助大家更容易理解,我寫了一個簡單的**Demo**,具體步驟如下: ? 首先新建一個**Android **工程 命名為**ViewDemo**. ? 然后自定義一個**View**類,命名為**MyView(extends View)**.代碼如下: ? ~~~ package com.android.tutor;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Rect;import android.graphics.Paint.Style;import android.util.AttributeSet;import android.view.View;public class MyView extends View { private Paint mPaint; private Context mContext; private static final String mString = "Welcome to Mr Wei's blog"; public MyView(Context context) { super(context); } public MyView(Context context,AttributeSet attr) { super(context,attr); } @Override protected void onDraw(Canvas canvas) { // TODO Auto-generated method stub super.onDraw(canvas); mPaint = new Paint(); //設置畫筆顏色 mPaint.setColor(Color.RED); //設置填充 mPaint.setStyle(Style.FILL); //畫一個矩形,前倆個是矩形左上角坐標,后面倆個是右下角坐標 canvas.drawRect(new Rect(10, 10, 100, 100), mPaint); mPaint.setColor(Color.BLUE); //繪制文字 canvas.drawText(mString, 10, 110, mPaint); }} ~~~ ? 然后將我們自定義的**View**加入到**main.xml**布局文件中,代碼如下: ? ~~~ <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/hello" /> <com.android.tutor.MyView android:layout_width="fill_parent" android:layout_height="fill_parent" /> </LinearLayout> ~~~ 最后執行之,效果如下圖: ? ![](https://box.kancloud.cn/2016-08-10_57aae59608059.gif) ? OK,大功告成,今天就寫到這里,開始做飯了,老婆孩子等我做飯了,lol~ ? ?
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