package blog.csdn.net.mchenys.myanimationloading;import android.animation.Animator;import android.animation.AnimatorListenerAdapter;import android.animation.ValueAnimator;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.PointF;import android.util.AttributeSet;import android.view.View;import android.view.animation.LinearInterpolator;import android.view.animation.OvershootInterpolator;/** * Created by mChenys on 2016/5/21. */public class AnimationLoading extends View {  private float mBigCircleRaduis = 90;//大圓的半徑  private float mSubCircleRadius = 20;//小圓的半徑  private PointF mBigCenterPoint;//大圓的圓心坐標  private Paint mBgPaint;//繪制背景的畫筆  private Paint mFgPaint;//繪制前景色的畫筆  private AnimatorTemplet mTemplet;//動畫模板  float mBigCircleRotateAngle;//大圓旋轉的角度  float mDiagonalDist;//屏幕對角線一半的距離  float mBgStrokeCircleRadius;//用于作為繪制背景空心圓的半徑  //6個小圓的顏色  private int[] colors = new int[]{Color.RED, Color.DKGRAY, Color.YELLOW, Color.BLUE, Color.LTGRAY, Color.GREEN};  public AnimationLoading(Context context) {    this(context, null);  }  public AnimationLoading(Context context, AttributeSet attrs) {    super(context, attrs);    init();  }  @Override  protected void onSizeChanged(int w, int h, int oldw, int oldh) {    super.onSizeChanged(w, h, oldw, oldh);    //確定大圓的圓心坐標    mBigCenterPoint.x = w / 2f;    mBigCenterPoint.y = h / 2f;    //屏幕對角線的一半    mDiagonalDist = (float) (Math.sqrt(w * w + h * h) / 2);  }  private void init() {    mBigCenterPoint = new PointF();    mFgPaint = new Paint();    mFgPaint.setAntiAlias(true);    mBgPaint = new Paint(mFgPaint);    mBgPaint.setColor(Color.WHITE);    mBgPaint.setStyle(Paint.Style.STROKE);  }  @Override  protected void onDraw(Canvas canvas) {    if (null == mTemplet) {      //開啟旋轉動畫      mTemplet = new RotateState();    }    //傳遞Canvas對象    mTemplet.drawState(canvas);  }  /**   * 繪制圓   *   * @param canvas   */  private void drawCircle(Canvas canvas) {    //獲取每個小圓間隔的角度    float rotateAngle = (float) (2 * Math.PI / colors.length);    for (int i = 0; i < colors.length; i++) {      //每個小圓的實際角度      double angle = rotateAngle * i + mBigCircleRotateAngle; //這里加上大圓旋轉的角度是為了帶動小圓一起旋轉      //計算每個小圓的圓心坐標      float cx = (float) (mBigCircleRaduis * Math.cos(angle)) + mBigCenterPoint.x;      float cy = (float) (mBigCircleRaduis * Math.sin(angle)) + mBigCenterPoint.y;      //繪制6個小圓      mFgPaint.setColor(colors[i]);      canvas.drawCircle(cx, cy, mSubCircleRadius, mFgPaint);    }  }  /**   * 繪制背景   *   * @param canvas   */  private void drawBackground(Canvas canvas) {    if (mBgStrokeCircleRadius > 0f) {      //不斷擴散的空心圓,空心圓的半徑為屏幕對角線的一半,空心圓的線寬則從線寬一半到0      float strokeWidth = mDiagonalDist - mBgStrokeCircleRadius;//線寬從對角線的1/2 ~ 0      mBgPaint.setStrokeWidth(strokeWidth);      float radius = mBgStrokeCircleRadius + strokeWidth / 2;//半徑從對角線的1/4 ~ 1/2      canvas.drawCircle(mBigCenterPoint.x, mBigCenterPoint.y,radius , mBgPaint);    } else {      //繪制白色背景      canvas.drawColor(Color.WHITE);    }  }  private abstract class AnimatorTemplet {    abstract void drawState(Canvas canvas);  }  /**   * 繪制旋轉動畫   */  private class RotateState extends AnimatorTemplet {    ValueAnimator mValueAnimator;    public RotateState() {      //旋轉的過程,就是不斷的獲取大圓的角度,從0-2π      mValueAnimator = ValueAnimator.ofFloat(0, (float) Math.PI * 2);      mValueAnimator.setInterpolator(new LinearInterpolator());//勻速插值器      mValueAnimator.setDuration(1200);      mValueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {        @Override        public void onAnimationUpdate(ValueAnimator animation) {          //獲取大圓旋轉的角度          mBigCircleRotateAngle = (float) animation.getAnimatedValue();          //重繪          invalidate();        }      });      mValueAnimator.setRepeatCount(ValueAnimator.INFINITE);//無限循環      mValueAnimator.start();    }    /**     * 停止旋轉動畫,在數據加載完畢后供外部調用     */    public void stopRotate() {      mValueAnimator.cancel();    }    @Override    void drawState(Canvas canvas) {      drawBackground(canvas);      drawCircle(canvas);    }  }  /**   * 繪制聚合動畫   */  private class MergingState extends AnimatorTemplet {    public MergingState() {      //聚合的過程,就是不斷的改變大圓的半徑,從mBigCircleRaduis~0      ValueAnimator valueAnimator = ValueAnimator.ofFloat(mBigCircleRaduis, 0);      valueAnimator.setInterpolator(new OvershootInterpolator(10f));//彈性插值器      valueAnimator.setDuration(600);      valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {        @Override        public void onAnimationUpdate(ValueAnimator animation) {          //獲取大圓變化的半徑          mBigCircleRaduis = (float) animation.getAnimatedValue();          //重繪          invalidate();        }      });      valueAnimator.addListener(new AnimatorListenerAdapter() {        @Override        public void onAnimationEnd(Animator animation) {          //聚合執行完后進入下一個擴散動畫          mTemplet = new SpreadState();        }      });      valueAnimator.start();    }    @Override    void drawState(Canvas canvas) {      drawBackground(canvas);      drawCircle(canvas);    }  }  /**   * 繪制擴散動畫   */  private class SpreadState extends AnimatorTemplet {    public SpreadState() {      //擴散的過程,就是不斷的改變背景畫繪制空心圓的半徑,從0~mDiagonalDist      ValueAnimator valueAnimator = ValueAnimator.ofFloat(0, mDiagonalDist);      valueAnimator.setDuration(600);      valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {        @Override        public void onAnimationUpdate(ValueAnimator animation) {          //獲取大圓變化的半徑          mBgStrokeCircleRadius = (float) animation.getAnimatedValue();          //重繪          invalidate();        }      });      valueAnimator.start();    }    @Override    void drawState(Canvas canvas) {      drawBackground(canvas);    }  }  /**   * 停止加載動畫   */  public void stopLoading() {    if (null != mTemplet && mTemplet instanceof RotateState) {      ((RotateState) mTemplet).stopRotate();      //開啟下一個聚合動畫      post(new Runnable() {        @Override        public void run() {          mTemplet = new MergingState();        }      });    }  }}

package blog.csdn.net.mchenys.myanimationloading;import android.os.Bundle;import android.os.Handler;import android.support.v7.app.AppCompatActivity;import android.widget.FrameLayout;import android.widget.ImageView;public class MainActivity extends AppCompatActivity {  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    FrameLayout content = new FrameLayout(this);    content.setOnClickListener(null);    ImageView bg = new ImageView(this);    bg.setImageResource(R.drawable.fg);    bg.setScaleType(ImageView.ScaleType.FIT_XY);    content.addView(bg);    final AnimationLoading loading = new AnimationLoading(this);    content.addView(loading);    setContentView(content);    new Handler().postDelayed(new Runnable() {      @Override      public void run() {        //3s后停止加載動畫        loading.stopLoading();      }    },3000);  }}