通过从右向左滑动以平滑动画关闭一个活动以进入第二个活动

Question

我想有一个介绍应用程序的活动,并且要关闭你必须从右向左滑动它(如果没有太多的工作,可能会有一个平滑的动画),那么我已经拥有应用程序的另一部分,就是这样ActionBar tabs + Swipe Views.我已经阅读了一些Android指南,比如实现Swipe Views,但它们不是我的情况.请问你能帮帮我吗？[使用"平滑动画"我的意思是滑动必须跟随手指]

Answer 1

我通常使用手势监听器来实现这一点:

首先,在res/anim以下内容中定义翻译动画:

slide_in_left.xml:

<set xmlns:android="http://schemas.android.com/apk/res/android">
    <translate android:fromXDelta="-50%p" android:toXDelta="0"
            android:duration="@android:integer/config_longAnimTime"/>
    <alpha android:fromAlpha="0.0" android:toAlpha="1.0"
            android:duration="@android:integer/config_mediumAnimTime" />
</set>

slide_in_right.xml:

    <set xmlns:android="http://schemas.android.com/apk/res/android">
    <translate android:fromXDelta="50%p" android:toXDelta="0"
            android:duration="@android:integer/config_longAnimTime"/>
    <alpha android:fromAlpha="0.0" android:toAlpha="1.0"
            android:duration="@android:integer/config_mediumAnimTime" />
</set>

slide_out_left.xml:

<set xmlns:android="http://schemas.android.com/apk/res/android">
    <translate android:fromXDelta="0" android:toXDelta="-50%p"
            android:duration="@android:integer/config_longAnimTime"/>
    <alpha android:fromAlpha="1.0" android:toAlpha="0.0"
            android:duration="@android:integer/config_mediumAnimTime" />
</set>

slide_out_right.xml:

<set xmlns:android="http://schemas.android.com/apk/res/android">
    <translate android:fromXDelta="0" android:toXDelta="50%p"
            android:duration="@android:integer/config_mediumAnimTime"/>
    <alpha android:fromAlpha="1.0" android:toAlpha="0.0"
            android:duration="@android:integer/config_mediumAnimTime" />
</set>

然后在您当前的活动类中:

class MyGestureDetector extends SimpleOnGestureListener {
        @Override
        public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
                float velocityY) {
            try {
                float slope = (e1.getY() - e2.getY()) / (e1.getX() - e2.getX());
                float angle = (float) Math.atan(slope);
                float angleInDegree = (float) Math.toDegrees(angle);
                // left to right
                if (e1.getX() - e2.getX() > 20 && Math.abs(velocityX) > 20) {
                    if ((angleInDegree < 45 && angleInDegree > -45)) {                      
        startActivity(new Intent(CurrentActivitiy.this, NextActivity.class); 
        CurrentActivity.this.overridePendingTransition(
            R.anim.slide_in_left, R.anim.slide_out_right);
         finish();
        }
                    // right to left fling
                } else if (e2.getX() - e1.getX() > 20
                        && Math.abs(velocityX) > 20) {
                    if ((angleInDegree < 45 && angleInDegree > -45)) {
        startActivity(new Intent(CurrentActivitiy.this, NextActivity.class); 
        CurrentActivity.this.overridePendingTransition(
            R.anim.slide_in_right, R.anim.slide_out_left);
         finish();

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

然后,您可以注册任何视图以接收/收听手势:

 final GestureDetector  gestureDetector = new GestureDetector(new MyGestureDetector());
         //the parent layout   
                findViewById(R.id.parent_layout).setOnTouchListener(new View.OnTouchListener() {
                    @Override
                    public boolean onTouch(View v, MotionEvent event) {
                        if (gestureDetector.onTouchEvent(event)) return false;
                        return false;
                    }
                });
         //an image view
        findViewById(R.id.image_view).setOnTouchListener(new View.OnTouchListener() {
                    @Override
                    public boolean onTouch(View v, MotionEvent event) {
                        if (gestureDetector.onTouchEvent(event)) return false;
                        return false;
                    }
                });
        // a text view
        findViewById(R.id.text_view).setOnTouchListener(new View.OnTouchListener() {
                    @Override
                    public boolean onTouch(View v, MotionEvent event) {
                        if (gestureDetector.onTouchEvent(event)) return false;
                        return false;
                    }
                });