Android(安卓)中自定义View的应用

首先新建一个Android 工程命名为ViewDemo . 然后自定义一个View 类，命名为MyView(extends View) .代码如下:

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();        //设置画笔颜色    mPaint.setColor(Color.RED);    //设置填充    mPaint.setStyle(Style.FILL);        //画一个矩形,前俩个是矩形左上角坐标，后面俩个是右下角坐标    canvas.drawRect(new Rect(10, 10, 100, 100), mPaint);        mPaint.setColor(Color.BLUE);    //绘制文字    canvas.drawText(mString, 10, 110, mPaint);   }  }

然后将我们自定义的View加入到main.xml布局文件中,代码如下:

    <?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>        <?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>

文章转自： http://weizhulin.blog.51cto.com/1556324/311457

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