Android使用Matrix旋转图片模拟碟片加载过程

package com.oyp.loadingdisk;  import java.io.InputStream;  import android.content.Context; import android.content.res.Resources; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Canvas; import android.graphics.Matrix; import android.graphics.Paint; import android.graphics.PaintFlagsDrawFilter; import android.view.View; /**  * 自定义的View,用来显示加载的图片  * @author ouyangpeng  * @link http://blog.csdn.net/ouyang_peng  *  * <p>在画图的时候，图片如果旋转或缩放之后，总是会出现那些华丽的锯齿。<br>  * 方法一：给Paint加上抗锯齿标志。然后将Paint对象作为参数传给canvas的绘制方法。<br>  * 如：mypaint.setAntiAlias(true);<p>  * 方法二：给Canvas加上抗锯齿标志。有些地方不能用paint的，就直接给canvas加抗锯齿，更方便。<br>  * 如：  * mSetfil = new PaintFlagsDrawFilter(0, Paint.FILTER_BITMAP_FLAG);<br>  * canvas.setDrawFilter(mSetfil);  */ public class LoadingDiscView extends View {   private RefreshHandle refreshHandle;   private Context context;   /** 用于旋转的bitmap*/   private Bitmap m_bmp_disc = null;   private Matrix m_matrix_disc = new Matrix();   /** 用于展现高亮背景的bitmap*/   private Bitmap m_bmp_light = null;   private Matrix m_matrix_light = new Matrix();   /**Paint滤波器*/   private PaintFlagsDrawFilter mSetfil = null;   /**声明一个画笔*/   private Paint mypaint = null;   /**图像缩放比例*/   private float m_scale =1.0f;   /**图像旋转的速度*/   private float m_disc_rot_speed = 0;   /**图像旋转的状态*/   private int m_state_play = 1;   /**图像旋转的最大速度*/   private float m_disc_max = 20f;    public void setRefreshHandle(RefreshHandle refreshHandle) {    this.refreshHandle = refreshHandle;   }    public LoadingDiscView(Context context) {    super(context);    this.context = context;    mSetfil = new PaintFlagsDrawFilter(0, Paint.FILTER_BITMAP_FLAG);//设置画布绘图无锯齿    initBitmap();   }    public boolean initBitmap() {    mypaint = new Paint();    //给Paint加上抗锯齿标志    mypaint.setAntiAlias(true);//画笔的抗锯齿（用于线条等）     Resources res = context.getResources();    InputStream is = res.openRawResource(R.drawable.loading_disc);    m_bmp_disc = BitmapFactory.decodeStream(is);    matrixPostTranslate(m_matrix_disc,m_bmp_disc);     is = res.openRawResource(R.drawable.loading_light);    m_bmp_light = BitmapFactory.decodeStream(is);    matrixPostTranslate(m_matrix_light,m_bmp_light);    return true;   }   /**    * 旋转图像    * @param matrix 控制旋转的矩阵    * @param bitmap 要旋转的图像    */   private void matrixPostTranslate(Matrix matrix,Bitmap bitmap) {    int tmp_width = bitmap.getWidth();    int tmp_height = bitmap.getHeight();    matrix.postTranslate(-tmp_width / 2, -tmp_height / 2); //设置平移位置    matrix.postScale(m_scale, m_scale); //设置缩放比例    matrix.postTranslate(123 * m_scale, 146 * m_scale);   }    protected void onDraw(Canvas canvas) {    super.onDraw(canvas);    //给Canvas加上抗锯齿标志    canvas.setDrawFilter(mSetfil);//图片线条（通用）的抗锯齿    canvas.drawBitmap(m_bmp_disc, m_matrix_disc, mypaint);    canvas.drawBitmap(m_bmp_light, m_matrix_light, mypaint);   }    public void update() {    if (m_disc_rot_speed > 0.01 || m_state_play == 1){     if (m_state_play == 1 && m_disc_rot_speed<m_disc_max){      m_disc_rot_speed += (m_disc_max+0.5f-m_disc_rot_speed)/30;     }     else if (m_disc_rot_speed>0.1){      m_disc_rot_speed -= (m_disc_rot_speed)/40;     }     m_matrix_disc .postRotate(m_disc_rot_speed, 123*m_scale, 146*m_scale);     invalidate();    }   }      public void onPause(){    refreshHandle.stop();   }   public void onResume(){    refreshHandle.run();   }     } 

package com.oyp.loadingdisk;  import android.os.Handler; import android.os.Message; /**  * 用来发送消息和处理消息的  * @author ouyangpeng  * @link http://blog.csdn.net/ouyang_peng  */ public class RefreshHandle extends Handler {  LoadingDiscView loadingDiscView;   public RefreshHandle(LoadingDiscView loadingDiscView) {   this.loadingDiscView = loadingDiscView;   loadingDiscView.setRefreshHandle(this);  }   public void run() {   loadingDiscView.update();   removeCallbacksAndMessages(null);   sendEmptyMessageDelayed(0, 65);  }   public void stop() {   removeCallbacksAndMessages(null);  }   @Override  public void handleMessage(Message msg) {   switch (msg.what) {   case 0:    run();    break;   }  } } 

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  xmlns:tools="http://schemas.android.com/tools"  android:layout_width="match_parent"  android:layout_height="match_parent"  android:background="#382517"  tools:context=".MainActivity"  >   <RelativeLayout   android:id="@+id/loading_disc"   android:layout_width="match_parent"   android:layout_height="wrap_content"   android:layout_below="@id/loading_disc"    android:paddingLeft="100dp"   >  </RelativeLayout>   <RelativeLayout   android:layout_width="fill_parent"   android:layout_height="wrap_content"   android:layout_marginTop="380dip" >    <TextView    android:id="@+id/loading_text"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:layout_centerHorizontal="true"    android:singleLine="true"    android:textColor="#FFFFFF"    android:text="读碟中,请稍后 . . ."    android:textSize="20sp" />  </RelativeLayout> </RelativeLayout> 

package com.oyp.loadingdisk;  import android.app.Activity; import android.os.Bundle; import android.widget.RelativeLayout; /**  * @author ouyangpeng  * @link http://blog.csdn.net/ouyang_peng  */ public class LoadingActivity extends Activity {  private RelativeLayout motionView;  private LoadingDiscView disc_motion;  private RefreshHandle refreshHandle;   @Override  protected void onCreate(Bundle savedInstanceState) {   super.onCreate(savedInstanceState);   setContentView(R.layout.loading);   disc_motion = new LoadingDiscView(this);   refreshHandle = new RefreshHandle(disc_motion);   motionView = (RelativeLayout) findViewById(R.id.loading_disc);   motionView.addView(disc_motion);   refreshHandle.sendEmptyMessage(0);  }  @Override  protected void onResume() {   super.onResume();   disc_motion.onResume();  } }