android - Android 的边框手势

Question

我正在开发一个应用程序(在 Galaxy Nexus 上)，我注意到当您从边框底部滑动到屏幕上时，Google 实现了“Google Now”应用程序(Chrome 浏览器也这样做了同时，不确定它是否仍然如此)。我一直在四处寻找，但一直无法确定他们是如何做到这一点的。有没有一种简单的方法来处理从边框开始而不是从屏幕开始的手势？

我查看了开发者页面以供引用，但我能找到的唯一文章是:

http://developer.android.com/design/patterns/gestures.html

是否还有其他地方可以获得此信息？

[编辑]

我一直在尝试根据 Lain_B 的方法使边缘手势工作，但没有成功，但无法使其工作。这是我用来尝试检测手势的代码，但 logcat 始终输出零...

public class MainActivity extends Activity implements OnGestureListener {

private GestureDetector myGesture;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    myGesture = new GestureDetector(getBaseContext(),
            (OnGestureListener) this);
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.activity_main, menu);
    return true;
}

@Override
public boolean onTouchEvent(MotionEvent event) {
    Log.e("Flags Touch", "Flags: " + event.getEdgeFlags());
    return myGesture.onTouchEvent(event);
}

@Override
public boolean onDown(MotionEvent e) {
    Log.e("Flags", "Flags: " + e.getEdgeFlags());
    Log.e("Event", "onDown");
    // TODO Auto-generated method stub
    return false;
}

@Override
public void onLongPress(MotionEvent e) {
    Log.e("Event", "onLongPress");
    // TODO Auto-generated method stub

}

@Override
public void onShowPress(MotionEvent e) {
    Log.e("Flags", "Flags: " + e.getEdgeFlags());
    Log.e("Event", "onShowPress");
    // TODO Auto-generated method stub

}

@Override
public boolean onSingleTapUp(MotionEvent e) {
    Log.e("Event", "onSingleTapUp");
    // TODO Auto-generated method stub
    return false;
}

@Override
public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,
        float distanceY) {
    // Log.e("Event", "onScroll");
    return false;
}

// these constants are used for onFling
private static final int SWIPE_MIN_DISTANCE = 120;
private static final int SWIPE_MAX_OFF_PATH = 250;
private static final int SWIPE_THRESHOLD_VELOCITY = 200;

@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
        float velocityY) {

    Log.e("Event", "onFling");
    Log.e("Flags", "Flags: " + e1.getEdgeFlags());

    if (e1.getEdgeFlags() == MotionEvent.EDGE_LEFT) {
        // code to handle swipe from left edge
        Log.e("!!!!!", "Edge fling!");
    }

    try {
        // do not do anything if the swipe does not reach a certain length
        // of distance
        if (Math.abs(e1.getY() - e2.getY()) > SWIPE_MAX_OFF_PATH)
            return false;

        // right to left swipe
        if (e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE
                && Math.abs(velocityX) < SWIPE_THRESHOLD_VELOCITY) {

        }
        // left to right swipe
        else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE
                && Math.abs(velocityX) < SWIPE_THRESHOLD_VELOCITY) {

        }
    } catch (Exception e) {
        // nothing
    }
    return false;

}
}

[编辑 2]

有了 Lain_B 请求的输出...

(使用 Nexus 7)...从边框上最左边的点开始，然后向右滑动到中间(大概)。

08-16 16:44:13.674: I/Fling(16702): Flags: 0
08-16 16:44:13.674: I/Fling(16702): e1: 2.5 711.5152
08-16 16:44:13.674: I/Fling(16702): e2: 215.4591 717.08105

从屏幕中心点滑动，离开屏幕(向右)

08-16 16:46:37.364: I/Fling(16702): Flags: 0
08-16 16:46:37.364: I/Fling(16702): e1: 392.5 758.1818
08-16 16:46:37.364: I/Fling(16702): e2: 783.4375 743.3334

Answer 1

我认为MotionEvent.getEdgeFlags()是你要找的。然后您可以将返回值与 EDGE_LEFT 进行比较, EDGE_RIGHT 等以查看触摸了哪条边。

if( event1.getEdgeFlags()&MotionEvent.EDGE_LEFT != 0 ){
    //code to handle swipe from left edge
}

或

if( e1.getX() < 5.0f ){
    //handle swipe from left edge
}