android – 在活动之间滑动

2023年12月6日 135次阅读

我有2个活动,我想用刷卡在它们之间切换,我已经做了很多关于谷歌的研究,但找不到解决方案,因为我正在使用位图(图像)我有大部分代码写在onCreate Activity的方法,是否有任何解决方案,或者如何将活动转换为片段 最佳答案 你可以使用GestureDetector来做到这一点.以下是示例代码段.

// You can change values of below constants as per need.
private static final int MIN_DISTANCE = 100;
private static final int MAX_OFF_PATH = 200;
private static final int THRESHOLD_VELOCITY = 100;
private GestureDetector mGestureDetector;

// write below code in onCreate method
mGestureDetector = new GestureDetector(context, new SwipeDetector());

// Set touch listener to parent view of activity layout
// Make sure that setContentView is called before setting touch listener.
findViewById(R.id.parent_view).setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                // Let gesture detector handle the event
                return mGestureDetector.onTouchEvent(event);
            }
        });


// Define a class to detect Gesture
private class SwipeDetector extends GestureDetector.SimpleOnGestureListener {
        @Override
        public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
            if (e1 != null && e2 != null) {
                float dy = e1.getY() - e2.getY();
                float dx = e1.getX() - e2.getX();

                // Right to Left swipe
                if (dx > MIN_DISTANCE && Math.abs(dy) < MAX_OFF_PATH &&
                        Math.abs(velocityX) > THRESHOLD_VELOCITY) {
            // Add code to change activity  
                    return true;
                }

                // Left to right swipe
                else if (-dx > MIN_DISTANCE && Math.abs(dy) < MAX_OFF_PATH &&
                        Math.abs(velocityX) > THRESHOLD_VELOCITY) {
            // Below is sample code to show left to right swipe while launching next activity
           currentActivity.overridePendingTransition(R.anim.right_in, R.anim.right_out);
           startActivity(new Intent(currentActivity,NextActivity.class));
                    return true;
                }
            }
            return false;
        }
}

//Below are sample animation xml files.

anim/right_in.xml
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <translate
        android:duration="500"
        android:fromXDelta="-100%p"
        android:toXDelta="0" />
</set>

anim/right_out.xml
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <translate
        android:duration="500"
        android:fromXDelta="0"
        android:toXDelta="100%p" />
</set>
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