对话框过渡效果

I am currently working on the transition effects for my dialog. Please refer to the image below:

我的对话框的入口动画应该是从上到中。而退出动画应该是从中间到顶部。我正在使用以下 XML 动画，但不幸的是，它们不起作用。

Slide_down.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
<translate android:fromYDelta="100%p" android:toYDelta="0" 
android:duration="1000"/>
</set>

Slide_up.xml

<?xml version="1.0" encoding="utf-8"?>
<translate xmlns:android="http://schemas.android.com/apk/res/android"
android:fromYDelta="0%p" android:toYDelta="50%p"
android:duration="1000"/>

编辑：这不是平常的Dialog。它是一个activity应用于Theme.Dialog in the AndroidManifest.xml

如果您将对话框创建为活动，那么您可以遵循此方法

您可以创建动画类：

public class DropDownToMiddleAnimation extends Animation {
    public int height, width;

    @Override
    public void initialize(int width, int height, int parentWidth,
            int parentHeight) {
        // TODO Auto-generated method stub
        super.initialize(width, height, parentWidth, parentHeight);
        this.width = width;
        this.height = height;
        setDuration(500);
        setFillAfter(true);
        setInterpolator(new LinearInterpolator());
    }

    Camera camera = new Camera();

    @Override
    protected void applyTransformation(float interpolatedTime, Transformation t) {
        // TODO Auto-generated method stub
        super.applyTransformation(interpolatedTime, t);

        Matrix matrix = t.getMatrix();
        camera.save();

        camera.getMatrix(matrix);
        matrix.setTranslate(0, ((height/2) * interpolatedTime)) );

        matrix.preTranslate(0, -height);
        camera.restore();

        this.setAnimationListener(this);
    }

and :

public class MiddleToTopAnimation extends Animation {
    public int height, width;

    @Override
    public void initialize(int width, int height, int parentWidth,
            int parentHeight) {
        // TODO Auto-generated method stub
        super.initialize(width, height, parentWidth, parentHeight);
        this.width = width;
        this.height = height;
        setDuration(500);
        setFillAfter(true);
        setInterpolator(new LinearInterpolator());
    }

    Camera camera = new Camera();

    @Override
    protected void applyTransformation(float interpolatedTime, Transformation t) {
        // TODO Auto-generated method stub
        super.applyTransformation(interpolatedTime, t);

        Matrix matrix = t.getMatrix();
        camera.save();

        camera.getMatrix(matrix);
        matrix.setTranslate(0, -((height/2) * interpolatedTime)) );//here is the change

        matrix.preTranslate(0, -height);
        camera.restore();

        this.setAnimationListener(this);
    }

并将它们与您的对话框一起使用

LinearLayout ll = (LinearLayout) findViewById(R.id.parentLayout);//parent layout in the xml, which serves as the background in the custom dialog

ll.startAnimation(new DropDownToMiddleAnimation());//use with launching of the dialog

ll.startAnimation(new MiddleToTopAnimation());//use while dismissing the dialog/finishing the dialog activity