Question

我是新手，可以为Android应用程序实现Swipe Gesture。我正在尝试使用以下代码从屏幕左侧滑动到右侧：

 public class MainActivity extends Activity implements OnClickListener{
private static final int SWIPE_MIN_DISTANCE = 10;
private static final int SWIPE_MAX_OFF_PATH = 250;
private static final int SWIPE_THRESHOLD_VELOCITY = 200;
private GestureDetector gestureDetector;
View.OnTouchListener gestureListener;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    ImageView btnSwipe = (ImageView)findViewById(R.id.imgBtnSwipe);
    btnSwipe.setOnClickListener(this);
    gestureDetector = new GestureDetector(this, new MyGestureDetector());
    gestureListener = new View.OnTouchListener() {
        public boolean onTouch(View v, MotionEvent event) {
            return gestureDetector.onTouchEvent(event);
        }
    };
    btnSwipe.setOnTouchListener(gestureListener);
}
class MyGestureDetector extends SimpleOnGestureListener {
    @Override
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
        try {
            if (Math.abs(e1.getY() - e2.getY()) > SWIPE_MAX_OFF_PATH)
                return false;
            if(e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
                Toast.makeText(MainActivity.this, "Left Swipe", Toast.LENGTH_SHORT).show();
            }  else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
                Toast.makeText(MainActivity.this, "Right Swipe", Toast.LENGTH_SHORT).show();
            }
        } catch (Exception e) {
            // nothing
        }
        return false;
    }

}
@Override
public void onClick(View v) {
}
}

我收到Toast消息作为右滑动。但是形象并没有动人。我该如何实现呢？请帮我提供示例代码/链接。

Answer 1

我找到了一个简单的解决方案如下：

右滑动（朝右）：

btnSwipe.setTranslationX(e2.getX());

左滑动（向左）“

btnSwipe.setTranslation(e1.getX());

现在，ImageView正在从右向左和从左向右水平过渡。但这可以从Android API等级11开始。

Answer 2

您需要使用PagerAdapter进行滑动功能。像这样：

public class FullScreenImageAdapter extends PagerAdapter {

//Stores all the image paths
private ArrayList<String> _imagePaths;

.........


 @Override
    public Object instantiateItem(ViewGroup container, int position) {
//This method is called each time user swipes the screen
//Write suitable code to display next image on the screen
}

......

}

以下是官方文档的链接。

http://developer.android.com/training/animation/screen-slide.html http://developer.android.com/reference/android/support/v4/view/PagerAdapter.html

以下是有关Image Slider

的优秀教程的链接

http://www.androidhive.info/2013/09/android-fullscreen-image-slider-with-swipe-and-pinch-zoom-gestures/

Android - 如何在Swipe上移动ImageView

2 个答案: