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android 自定义view的简单实例_安卓自定义view简单实例

作者：凡人多烦事01 | 2024-06-04 20:51:28

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安卓自定义view简单实例

  1，提取和封装 使用抽象方法 

  package com.example.androidmyview.v3; 

  import android.content.Context; 

  import android.graphics.Canvas; 

  import android.util.AttributeSet; 

  import android.view.View; 

  public abstract class BaseView extends View { 

   private mythread thread; 

   public BaseView(Context context) { 

    super(context); 

}

   public BaseView(Context context, AttributeSet attrs) { 

    super(context, attrs); 

}

   public BaseView(Context context, AttributeSet attrs, int defStyleAttr) { 

    super(context, attrs, defStyleAttr); 

}

   @Override 

   protected void onDraw(Canvas canvas) { 

    if (thread == null) { 

     thread = new mythread(); 

     thread.start(); 

    }else { 

     drawsub(canvas); 

}

}

/**

    * 绘制方法 

    * @param canvas 

*/

   protected  abstract void drawsub(Canvas canvas); 

/**

    * 逻辑运算 

*/

   protected abstract void Logic(); 

/**

    * 自定义线程 

    * @author Administrator 

*

*/

   class mythread extends Thread { 

    @Override 

    public void run() { 

     while (true) { 

      Logic(); 

      //从新绘制 

      postInvalidate(); 

      try { 

       Thread.sleep(30); 

      } catch (InterruptedException e) { 

       e.printStackTrace(); 

}

}

}

};

}

  ----------------------------------------------- 

  package com.example.androidmyview.v3; 

  import java.util.Random; 

  import android.content.Context; 

  import android.graphics.Canvas; 

  import android.graphics.Paint; 

  import android.graphics.RectF; 

  import android.util.AttributeSet; 

  public class LogicView extends BaseView{ 

   private Paint paint; 

   private float x = 0; 

   private static String text ="LogicView"; 

   private RectF rectf; 

   private float sweepAngle =0; 

   private Random random; 

   public LogicView(Context context) { 

    super(context); 

}

   public LogicView(Context context, AttributeSet attrs) { 

    super(context, attrs); 

}

   public LogicView(Context context, AttributeSet attrs, int defStyleAttr) { 

    super(context, attrs, defStyleAttr); 

}

   @Override 

   protected void drawsub(Canvas canvas) { 

    paint = new Paint(); 

    paint.setTextSize(30); 

    rectf = new RectF(0,60,100,160); 

    canvas.drawText(text, x, 30, paint); 

    canvas.drawArc(rectf, 0, sweepAngle, true, paint); 

}

   @Override 

   protected void Logic() { 

    random  = new Random(); 

    x += 3; 

    if (x>getWidth()) { 

     x=0-paint.measureText(text); 

}

    sweepAngle++; 

    if (sweepAngle>360) { 

     sweepAngle=0; 

}

    //产生随机数 

    int r = random.nextInt(256); 

    int g = random.nextInt(256); 

    int b = random.nextInt(256); 

    //颜色不断变化 

    paint.setARGB(255, r, g, b); 

}

}

  --------------------------------------------- 

  布局文件采用framelayout 

  <FrameLayout xmlns:android=" 
 http://schemas.android.com/apk/res/android" 

      xmlns:tools=" 
 http://schemas.android.com/tools" 

      android:id="@+id/container" 

      android:layout_width="match_parent" 

      android:layout_height="match_parent" 

>

      <com.example.androidmyview.v1.Myview  

          android:layout_width="match_parent" 

          android:layout_height="match_parent" 

          android:visibility="gone"/> 

     <com.example.androidmyview.v3.LogicView 

        android:layout_width="match_parent" 

        android:layout_height="match_parent" 

/>

  </FrameLayout> 

  -------------------------------------------------------- 

  使用xml文件解析自定义view 

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