package com.rong.activity;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.util.AttributeSet;import android.view.SurfaceHolder;import android.view.SurfaceView;/** * 自定義SurfaceView *  * @author 徐榮 * */public class XRSurfaceView extends SurfaceView implements SurfaceHolder.Callback, Runnable {  // SurfaceView的寬  int surfaceWidth;  // SurfaceView的高  int surfaceHeight;  // SurfaceHolder對象  SurfaceHolder mSurfaceHolder;  // 開關(guān)線程的標(biāo)志位  boolean isRunning = true;  // 畫筆  Paint mPaint;  // 圓的半徑  float radius = 0;  // 圓是變大還是縮小的狀態(tài)  boolean status = true;  // 圓變化的速度  int mSpeed = 3;  public XRSurfaceView(Context context, AttributeSet attrs) {    super(context, attrs);    initView();  }  private void initView() {    // 獲取mSurfaceHolder    mSurfaceHolder = getHolder();    // 添加回調(diào)    mSurfaceHolder.addCallback(this);  }  @Override  public void surfaceCreated(SurfaceHolder holder) {    isRunning = true;    // 初始化畫筆    mPaint = new Paint();    mPaint.setAntiAlias(true);    mPaint.setColor(Color.BLUE);    // 開啟繪制線程    new Thread(this).start();  }  @Override  public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {    // 獲取surface的寬    surfaceWidth = width;    // 獲取surface的高    surfaceHeight = height;  }  @Override  public void surfaceDestroyed(SurfaceHolder holder) {    // 關(guān)閉繪制線程    isRunning = false;  }  @Override  public void run() {    Canvas mCanvas = null;    while (isRunning) {      try {        // 鎖定canva進(jìn)行繪制        mCanvas = mSurfaceHolder.lockCanvas(null);        // 這個方法很重要，相當(dāng)于重繪（一定要調(diào)用不然看不到效果）        mCanvas.drawColor(Color.BLACK);        // 畫圓        mCanvas.drawCircle((surfaceWidth / 2), (surfaceHeight / 2), radius, mPaint);        // 更改半徑變量        if (status) {          radius = radius + mSpeed;          if (radius > 200) {            status = false;          }        } else {          radius = radius - mSpeed;          if (radius < 0) {            status = true;          }        }      } catch (Exception e) {        e.printStackTrace();      } finally {        // 解除畫布鎖        mSurfaceHolder.unlockCanvasAndPost(mCanvas);      }    }  }}

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  android:layout_width="match_parent"  android:layout_height="match_parent"  android:background="#ffffff"  android:orientation="vertical" >  <com.rong.activity.XRSurfaceView    android:layout_width="match_parent"    android:layout_height="match_parent"    android:layout_centerInParent="true"    android:orientation="vertical" /></RelativeLayout>