在ViewFlipper中使用Rotate3dAnimation旋转切换界面效果

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gundumw100 2023-03-19 09:57:05 ©著作权

文章标签 3d 3D android 文章分类 JavaScript 前端开发

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Rotate3dAnimation是google api demo中copy出来的，具体的例子在Views/Animation/3D Transition中。
这里我就直接贴了：

package com.ata.util;

import android.view.animation.Animation;
import android.view.animation.Transformation;
import android.graphics.Camera;
import android.graphics.Matrix;

/**
 * An animation that rotates the view on the Y axis between two specified angles.
 * This animation also adds a translation on the Z axis (depth) to improve the effect.
 */
public class Rotate3dAnimation extends Animation {
    private final float mFromDegrees;
    private final float mToDegrees;
    private final float mCenterX;
    private final float mCenterY;
    private final float mDepthZ;
    private final boolean mReverse;
    private Camera mCamera;

    /**
     * Creates a new 3D rotation on the Y axis. The rotation is defined by its
     * start angle and its end angle. Both angles are in degrees. The rotation
     * is performed around a center point on the 2D space, definied by a pair
     * of X and Y coordinates, called centerX and centerY. When the animation
     * starts, a translation on the Z axis (depth) is performed. The length
     * of the translation can be specified, as well as whether the translation
     * should be reversed in time.
     *
     * @param fromDegrees the start angle of the 3D rotation
     * @param toDegrees the end angle of the 3D rotation
     * @param centerX the X center of the 3D rotation
     * @param centerY the Y center of the 3D rotation
     * @param reverse true if the translation should be reversed, false otherwise
     */
    public Rotate3dAnimation(float fromDegrees, float toDegrees,
            float centerX, float centerY, float depthZ, boolean reverse) {
        mFromDegrees = fromDegrees;
        mToDegrees = toDegrees;
        mCenterX = centerX;
        mCenterY = centerY;
        mDepthZ = depthZ;
        mReverse = reverse;
    }

    @Override
    public void initialize(int width, int height, int parentWidth, int parentHeight) {
        super.initialize(width, height, parentWidth, parentHeight);
        mCamera = new Camera();
    }

    @Override
    protected void applyTransformation(float interpolatedTime, Transformation t) {
        final float fromDegrees = mFromDegrees;
        float degrees = fromDegrees + ((mToDegrees - fromDegrees) * interpolatedTime);

        final float centerX = mCenterX;
        final float centerY = mCenterY;
        final Camera camera = mCamera;

        final Matrix matrix = t.getMatrix();

        camera.save();
        if (mReverse) {
            camera.translate(0.0f, 0.0f, mDepthZ * interpolatedTime);
        } else {
            camera.translate(0.0f, 0.0f, mDepthZ * (1.0f - interpolatedTime));
        }
        camera.rotateY(degrees);
        camera.getMatrix(matrix);
        camera.restore();

        matrix.preTranslate(-centerX, -centerY);
        matrix.postTranslate(centerX, centerY);
    }
}

接下来就是要在ViewFlipper中使用它了，

首先在布局中加入2个view，类似：

<ViewFlipper 
        android:id="@+id/viewFlipper"
        android:layout_width="fill_parent"  
        android:layout_height="fill_parent"  
        >
        <include layout="@layout/layout_0"/>
        <include layout="@layout/layout_1"/>
    </ViewFlipper>

然后通常在代码中怎样写：

我这里是按一个按钮将2个ListView翻来覆去的3D旋转显示。

View.OnClickListener onClickListener=new View.OnClickListener(){

    @Override
    public void onClick(View v) {
      // TODO Auto-generated method stub
      float halfWidth=viewFlipper.getWidth()/2.0f;
      float halfHeight=viewFlipper.getHeight()/2.0f;
      int duration=500;
      int depthz=0;//viewFlipper.getWidth()/2;
      if(btn_rightTop.getText().equals("日历视图")){
        btn_rightTop.setText("分类视图");
        
        Rotate3dAnimation in=new Rotate3dAnimation(-90, 0,halfWidth,halfHeight,depthz,false);  
        in.setDuration(duration);  
        in.setStartOffset(duration);
        viewFlipper.setInAnimation(in);  
        Rotate3dAnimation out=new Rotate3dAnimation(0, 90,halfWidth,halfHeight,depthz,false);  
        out.setDuration(duration);  
        viewFlipper.setOutAnimation(out);  
        viewFlipper.showNext();         
      }else{
        btn_rightTop.setText("日历视图");
        
        Rotate3dAnimation in=new Rotate3dAnimation(90, 0,halfWidth,halfHeight,depthz,false);  
        in.setDuration(duration);  
        in.setStartOffset(duration);
        viewFlipper.setInAnimation(in);  
        Rotate3dAnimation out=new Rotate3dAnimation(0, -90,halfWidth,halfHeight,depthz,false);  
        out.setDuration(duration);  
        viewFlipper.setOutAnimation(out);  
        viewFlipper.showPrevious();  
      }
    }
    
  };