解析Android中Animation动画的编写要点

Animation a = new TranslateAnimation(0.0f, 
        targetParent.getWidth() - target.getWidth() - targetParent.getPaddingLeft() - 
        targetParent.getPaddingRight(), 0.0f, 0.0f); 

a.setDuration(1000);//设置动画所用的时间 
    a.setStartOffset(300);//设置动画启动的延时 
    //设置重复模式，RESTART为结束后重新开始，REVERSE为按原来的轨迹逆向返回 
    a.setRepeatMode(Animation.RESTART); 
    //设置重复次数，INFINITE为无限 
    a.setRepeatCount(Animation.INFINITE); 
    //根据用户在Spinner的选择设置target的进入的方式 
    switch (position) { 
      case 0: 
        //加速进入 
        a.setInterpolator(AnimationUtils.loadInterpolator(this.R.anim.accelerate_interpolator)); 
        break; 
      case 1: 
        //减速进入 
        a.setInterpolator(AnimationUtils.loadInterpolator(this, 
            android.R.anim.decelerate_interpolator)); 
        break; 
      case 2: 
        //加速进入.与第一个的区别为当repeatMode为reverse时,仍为加速返回原点 
        a.setInterpolator(AnimationUtils.loadInterpolator(this, 
            android.R.anim.accelerate_decelerate_interpolator)); 
        break; 
      case 3: 
        //先往后退一点再加速前进 
        a.setInterpolator(AnimationUtils.loadInterpolator(this, 
            android.R.anim.anticipate_interpolator)); 
        break; 
      case 4: 
        //减速前进,冲过终点前再后退 
        a.setInterpolator(AnimationUtils.loadInterpolator(this, 
            android.R.anim.overshoot_interpolator)); 
        break; 
      case 5: 
        //case 3,4的结合体 
        a.setInterpolator(AnimationUtils.loadInterpolator(this, 
            android.R.anim.anticipate_overshoot_interpolator)); 
        break; 
      case 6: 
        //停止前来回振几下 
        a.setInterpolator(AnimationUtils.loadInterpolator(this, 
            android.R.anim.bounce_interpolator)); 
        break; 
    } 
    //让target开始执行这个动画 
    target.startAnimation(a); 
  } 

mFlipper.startFlipping(); 

public void onItemSelected(AdapterView parent, View v, int position, long id) { 
    switch (position) { 
    case 0: 
      mFlipper.setInAnimation(AnimationUtils.loadAnimation(this, 
          R.anim.push_up_in)); 
      mFlipper.setOutAnimation(AnimationUtils.loadAnimation(this, 
          R.anim.push_up_out)); 
      break; 
    case 1: 
      mFlipper.setInAnimation(AnimationUtils.loadAnimation(this, 
          R.anim.push_left_in)); 
      mFlipper.setOutAnimation(AnimationUtils.loadAnimation(this, 
          R.anim.push_left_out)); 
      break; 
    case 2: 
      mFlipper.setInAnimation(AnimationUtils.loadAnimation(this.R.anim.fade_in)); 
      mFlipper.setOutAnimation(AnimationUtils.loadAnimation(this, 
          android.R.anim.fade_out)); 
      break; 
    default: 
      mFlipper.setInAnimation(AnimationUtils.loadAnimation(this, 
          R.anim.hyperspace_in)); 
      mFlipper.setOutAnimation(AnimationUtils.loadAnimation(this, 
          R.anim.hyperspace_out)); 
      break; 
    } 
  }