Android实现一个比相册更高大上的左右滑动特效（附源码）

// import语句省略
public class ViewFlipperDemo extends Activity {
  private static final String TAG = "ViewFlipperDemo";

  private ViewFlipper mViewFlipper;
  private float mOldTouchValue;

  @Override
  protected void onCreate(Bundle onSavedInstance) {
    super.onCreate(onSavedInstance);

    // 设置为全屏
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    setContentView(R.layout.view_flipper_demo);
    mViewFlipper = findViewById(R.id.viewFlipper1);
  }

  @Override
  public boolean onTouchEvent(MotionEvent event) {
    switch (event.getAction()) {
      case MotionEvent.ACTION_DOWN:
        mOldTouchValue = event.getX();
        break;

        case MotionEvent.ACTION_UP:
          float currentX = event.getX();

          // 手指向右滑动: 手指向右滑动时横坐标 X 的值会变大，因此 currentX 的值更大
          if (mOldTouchValue  currentX) {

            // 进入屏幕的动效
            mViewFlipper.setInAnimation(AnimationHelper.inFromRightAnimation());

            // 退出屏幕的动效
            mViewFlipper.setOutAnimation(AnimationHelper.outToLeftAnimation());
            mViewFlipper.showPrevious();
          }
          break;

        default:
          break;
    }
    return super.onTouchEvent(event);
  }
}

public class AnimationHelper {

  // 左滑的进入动画
  public static Animation inFromRightAnimation() {
    Animation inFromRight = new TranslateAnimation(
        Animation.RELATIVE_TO_PARENT,
        1.0f,
        Animation.RELATIVE_TO_PARENT,
        0.0f,
        Animation.RELATIVE_TO_PARENT,
        0.0f,
        Animation.RELATIVE_TO_PARENT,
        0.0f);
    inFromRight.setDuration(500);
    inFromRight.setInterpolator(new AccelerateInterpolator());
    return inFromRight;
  }

  // 左滑的退出动画
  public static Animation outToLeftAnimation() {
    Animation outToLeft = new TranslateAnimation(
        Animation.RELATIVE_TO_PARENT,
        0.0f,
        Animation.RELATIVE_TO_PARENT,
        -1.0f,
        Animation.RELATIVE_TO_PARENT,
        0.0f,
        Animation.RELATIVE_TO_PARENT,
        0.0f);
    outToLeft.setDuration(500);
    outToLeft.setInterpolator(new AccelerateInterpolator());
    return outToLeft;
  }

  // 右滑的进入动画
  public static Animation inFromLeftAnimation() {
    Animation inFromLeft = new TranslateAnimation(
        Animation.RELATIVE_TO_PARENT,
        -1.0f,
        Animation.RELATIVE_TO_PARENT,
        0.0f,
        Animation.RELATIVE_TO_PARENT,
        0.0f,
        Animation.RELATIVE_TO_PARENT,
        0.0f);
    inFromLeft.setDuration(500);
    inFromLeft.setInterpolator(new AccelerateInterpolator());
    return inFromLeft;
  }

  // 右滑的退出动画
  public static Animation outToRightAnimation() {
    Animation outToRight = new TranslateAnimation(
        Animation.RELATIVE_TO_PARENT,
        0.0f,
        Animation.RELATIVE_TO_PARENT,
        1.0f,
        Animation.RELATIVE_TO_PARENT,
        0.0f,
        Animation.RELATIVE_TO_PARENT,
        0.0f);
    outToRight.setDuration(500);
    outToRight.setInterpolator(new AccelerateInterpolator());
    return outToRight;
  }
}

// 左滑的进入动画
public static Animation inFromRightAnimation() {
  Animation inFromRight = new TranslateAnimation(
      Animation.RELATIVE_TO_PARENT,
      1.0f,
      Animation.RELATIVE_TO_PARENT,
      0.0f,
      Animation.RELATIVE_TO_PARENT,
      -1.0f,
      Animation.RELATIVE_TO_PARENT,
      0.0f);
  inFromRight.setDuration(500);
  inFromRight.setInterpolator(new AccelerateInterpolator());
  return inFromRight;
}

// 左滑的退出动画
public static Animation outToLeftAnimation() {
  Animation outToLeft = new TranslateAnimation(
      Animation.RELATIVE_TO_PARENT,
      0.0f,
      Animation.RELATIVE_TO_PARENT,
      -1.0f,
      Animation.RELATIVE_TO_PARENT,
      0.0f,
      Animation.RELATIVE_TO_PARENT,
      1.0f);
  outToLeft.setDuration(500);
  outToLeft.setInterpolator(new AccelerateInterpolator());
  return outToLeft;
}

// 右滑的进入动画
public static Animation inFromLeftAnimation() {
  Animation inFromLeft = new TranslateAnimation(
      Animation.RELATIVE_TO_PARENT,
      -1.0f,
      Animation.RELATIVE_TO_PARENT,
      0.0f,
      Animation.RELATIVE_TO_PARENT,
      -1.0f,
      Animation.RELATIVE_TO_PARENT,
      0.0f);
  inFromLeft.setDuration(500);
  inFromLeft.setInterpolator(new AccelerateInterpolator());
  return inFromLeft;
}

// 右滑的退出动画
public static Animation outToRightAnimation() {
  Animation outToRight = new TranslateAnimation(
      Animation.RELATIVE_TO_PARENT,
      0.0f,
      Animation.RELATIVE_TO_PARENT,
      1.0f,
      Animation.RELATIVE_TO_PARENT,
      0.0f,
      Animation.RELATIVE_TO_PARENT,
      1.0f);
  outToRight.setDuration(500);
  outToRight.setInterpolator(new AccelerateInterpolator());
  return outToRight;
}