android 两种按钮的动画效果

先来看效果:



上面为两个按钮，点击对应的按钮，绿色背景会滚动到相应的按钮后面
点击红色方块会有反转效果，仿照win8磁铁的效果

下面是代码
ScrollAnimation.java

package com.iaiai.activity;

import android.graphics.Camera;
import android.graphics.Matrix;
import android.util.Log;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.LinearInterpolator;
import android.view.animation.Transformation;

/**
 * 
 * <br/>
 * Title: ScrollAnimation.java<br/>
 * E-Mail: [e-mail]<br/>
 * QQ: 176291935<br/>
 * Http: iaiai.iteye.com<br/>
 * Create time: 2013-2-19 上午10:53:06<br/>
 * <br/>
 * 
 * @author 丸子
 * @version 0.0.1
 */
public class ScrollAnimation extends Animation {

	private View view;
	private Camera camera = new Camera();
	private boolean direction = true; // true往右，false往左

	public ScrollAnimation(View view, boolean direction) {
		this.view = view;
		this.direction = direction;
	}

	@Override
	public void initialize(int width, int height, int parentWidth, int parentHeight) {
		super.initialize(width, height, parentWidth, parentHeight);
		setDuration(300);
		setFillAfter(true);
		setFillBefore(true);
		setInterpolator(new LinearInterpolator());
	}

	protected void applyTransformation(float interpolatedTime, Transformation transformation) {
		Matrix matrix = transformation.getMatrix();

		camera.save();
		if (direction) {
			camera.translate(interpolatedTime * view.getWidth(), 0.0f, 0);
		} else {
			camera.translate(view.getWidth() - (interpolatedTime * view.getWidth()), 0.0f, 0);
		}
		camera.getMatrix(matrix);
		camera.restore();
	}
}

RotateAnimation.java

package com.iaiai.activity;

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

/**
 * 
 * <br/>
 * Title: RotateAnimation.java<br/>
 * E-Mail: [e-mail]<br/>
 * QQ: 176291935<br/>
 * Http: iaiai.iteye.com<br/>
 * Create time: 2013-2-19 上午10:07:57<br/>
 * <br/>
 * 
 * @author 丸子
 * @version 0.0.1
 */
public class RotateAnimation extends Animation {

	/** 值为true时可明确查看动画的旋转方向。 */
	public static final boolean DEBUG = false;
	/** 沿Y轴正方向看，数值减1时动画逆时针旋转。 */
	public static final boolean ROTATE_DECREASE = true;
	/** 沿Y轴正方向看，数值减1时动画顺时针旋转。 */
	public static final boolean ROTATE_INCREASE = false;
	/** Z轴上最大深度。 */
	public static final float DEPTH_Z = 310.0f;
	/** 动画显示时长。 */
	public static final long DURATION = 800l;
	/** 图片翻转类型。 */
	private final boolean type;
	private final float centerX;
	private final float centerY;
	private Camera camera;
	/** 用于监听动画进度。当值过半时需更新txtNumber的内容。 */
	private InterpolatedTimeListener listener;

	public RotateAnimation(View view, boolean type) {
		centerX = view.getWidth() / 2.0f;
		centerY = view.getHeight() / 2.0f;
		this.type = type;
		setDuration(DURATION);
	}

	public void initialize(int width, int height, int parentWidth, int parentHeight) {
		// 在构造函数之后、getTransformation()之前调用本方法。
		super.initialize(width, height, parentWidth, parentHeight);
		camera = new Camera();
	}

	public void setInterpolatedTimeListener(InterpolatedTimeListener listener) {
		this.listener = listener;
	}

	protected void applyTransformation(float interpolatedTime, Transformation transformation) {
		// interpolatedTime:动画进度值，范围为[0.0f,10.f]
		if (listener != null) {
			listener.interpolatedTime(interpolatedTime);
		}
		float from = 0.0f, to = 0.0f;
		if (type == ROTATE_DECREASE) {
			from = 0.0f;
			to = 180.0f;
		} else if (type == ROTATE_INCREASE) {
			from = 360.0f;
			to = 180.0f;
		}
		float degree = from + (to - from) * interpolatedTime;
		boolean overHalf = (interpolatedTime > 0.5f);
		if (overHalf) {
			// 翻转过半的情况下，为保证数字仍为可读的文字而非镜面效果的文字，需翻转180度。
			degree = degree - 180;
		}
		// float depth = 0.0f;
		float depth = (0.5f - Math.abs(interpolatedTime - 0.5f)) * DEPTH_Z;
		final Matrix matrix = transformation.getMatrix();
		camera.save();
		camera.translate(0.0f, 0.0f, depth);
		camera.rotateY(degree);
		camera.getMatrix(matrix);
		camera.restore();
		if (DEBUG) {
			if (overHalf) {
				matrix.preTranslate(-centerX * 2, -centerY);
				matrix.postTranslate(centerX * 2, centerY);
			}
		} else {
			// 确保图片的翻转过程一直处于组件的中心点位置
			matrix.preTranslate(-centerX, -centerY);
			matrix.postTranslate(centerX, centerY);
		}
	}

	/** 动画进度监听器。 */
	public static interface InterpolatedTimeListener {
		public void interpolatedTime(float interpolatedTime);
	}

}

MainActivity.java

package com.iaiai.activity;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.animation.AnimationUtils;
import android.widget.TextView;

import com.iaiai.activity.RotateAnimation.InterpolatedTimeListener;

public class MainActivity extends Activity implements OnClickListener, InterpolatedTimeListener {

	private boolean bol = true;
	private boolean enableRefresh;
	private int number = 0;

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

		findViewById(R.id.btn1).setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v) {
				if (!bol)
					findViewById(R.id.tv).startAnimation(new ScrollAnimation(findViewById(R.id.tv), false));
				bol = true;
			}
		});
		findViewById(R.id.btn2).setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v) {
				if (bol)
					findViewById(R.id.tv).startAnimation(new ScrollAnimation(findViewById(R.id.tv), true));
				bol = false;
			}
		});

		findViewById(R.id.layout1).setOnClickListener(this);
	}

	public void onClick(View v) {
		enableRefresh = true;
		RotateAnimation rotateAnim = null;
		if (bol) {
			number--;
			rotateAnim = new RotateAnimation(findViewById(R.id.layout1), RotateAnimation.ROTATE_DECREASE);
		} else {
			number++;
			rotateAnim = new RotateAnimation(findViewById(R.id.layout1), RotateAnimation.ROTATE_INCREASE);
		}
		if (rotateAnim != null) {
			rotateAnim.setInterpolatedTimeListener(this);
			rotateAnim.setFillAfter(true);
			findViewById(R.id.layout1).startAnimation(rotateAnim);
		}
	}

	@Override
	public void interpolatedTime(float interpolatedTime) {
		// 监听到翻转进度过半时，更新txtNumber显示内容。
		if (enableRefresh && interpolatedTime > 0.5f) {
			((TextView) findViewById(R.id.ltv)).setText(Integer.toString(number));
			enableRefresh = false;
		}
	}

}

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="@android:color/white"
    android:orientation="vertical" >

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:paddingBottom="10dip"
        android:paddingLeft="20dip"
        android:paddingRight="20dip"
        android:paddingTop="10dip" >

        <RelativeLayout
            android:layout_width="fill_parent"
            android:layout_height="wrap_content" >

            <LinearLayout
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:orientation="horizontal" >

                <TextView
                    android:id="@+id/tv"
                    android:layout_width="fill_parent"
                    android:layout_height="fill_parent"
                    android:layout_weight="1"
                    android:background="#00ff00" />

                <TextView
                    android:layout_width="fill_parent"
                    android:layout_height="fill_parent"
                    android:layout_weight="1"
                    android:textColor="@android:color/black"
                    android:textSize="20dip"
                    android:visibility="invisible" />
            </LinearLayout>

            <LinearLayout
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:orientation="horizontal" >

                <TextView
                    android:id="@+id/btn1"
                    android:layout_width="fill_parent"
                    android:layout_height="fill_parent"
                    android:layout_weight="1"
                    android:gravity="center"
                    android:text="左旋转"
                    android:textColor="@android:color/black"
                    android:textSize="20dip" />

                <TextView
                    android:id="@+id/btn2"
                    android:layout_width="fill_parent"
                    android:layout_height="fill_parent"
                    android:layout_weight="1"
                    android:gravity="center"
                    android:text="右旋转"
                    android:textColor="@android:color/black"
                    android:textSize="20dip" />
            </LinearLayout>
        </RelativeLayout>
    </LinearLayout>

    <LinearLayout
        android:id="@+id/layout1"
        android:layout_width="150dip"
        android:layout_height="150dip"
        android:background="#ff0000" >

        <TextView
            android:id="@+id/ltv"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="文字"
            android:textColor="@android:color/white"
            android:textSize="20dip" />
    </LinearLayout>

</LinearLayout>