Android 翻滚的TextView

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Camera;
import android.graphics.Matrix;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.View;
import android.view.animation.AccelerateInterpolator;
import android.view.animation.Animation;
import android.view.animation.Transformation;
import android.widget.TextSwitcher;
import android.widget.TextView;
import android.widget.ViewSwitcher;

import com.ly.sxh.R;

public class AutoTextView extends TextSwitcher implements
ViewSwitcher.ViewFactory {

private float mHeight;
private Context mContext;
//mInUp,mOutUp分别构成向下翻页的进出动画
private Rotate3dAnimation mInUp;
private Rotate3dAnimation mOutUp;

//mInDown,mOutDown分别构成向下翻页的进出动画
private Rotate3dAnimation mInDown;
private Rotate3dAnimation mOutDown;

public AutoTextView(Context context) {
this(context, null);
// TODO Auto-generated constructor stub
}

public AutoTextView(Context context, AttributeSet attrs) {
super(context, attrs);
// TODO Auto-generated constructor stub
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.auto3d);
mHeight = a.getDimension(R.styleable.auto3d_textSize, 14);
a.recycle();
mContext = context;
init();
}

private void init() {
setFactory(this);
mInUp = createAnim(-90, 0 , true, true);
mOutUp = createAnim(0, 90, false, true);
mInDown = createAnim(90, 0 , true , false);
mOutDown = createAnim(0, -90, false, false);
//setOutAnimation()后，B将执行OutAnimation
setInAnimation(mInUp);
setOutAnimation(mOutUp);
}

private Rotate3dAnimation createAnim(float start, float end, boolean turnIn, boolean turnUp){
final Rotate3dAnimation rotation = new Rotate3dAnimation(start, end, turnIn, turnUp);
rotation.setDuration(800);
rotation.setFillAfter(false);
rotation.setInterpolator(new AccelerateInterpolator());
return rotation;
}

//这里返回的TextView，就是我们看到的View
@Override
public View makeView() {
// TODO Auto-generated method stub
TextView t = new TextView(mContext);
t.setGravity(Gravity.CENTER);
t.setTextSize(mHeight);
t.setMaxLines(1);
t.setTextColor(getResources().getColor(R.color.black6));
return t;
}
//定义动作，向下滚动翻页
public void previous(){
if(getInAnimation() != mInDown){
setInAnimation(mInDown);
}
if(getOutAnimation() != mOutDown){
setOutAnimation(mOutDown);
}
}
//定义动作，向上滚动翻页
public void next(){
if(getInAnimation() != mInUp){
setInAnimation(mInUp);
}
if(getOutAnimation() != mOutUp){
setOutAnimation(mOutUp);
}
}

class Rotate3dAnimation extends Animation {
private final float mFromDegrees;
private final float mToDegrees;
private float mCenterX;
private float mCenterY;
private final boolean mTurnIn;
private final boolean mTurnUp;
private Camera mCamera;

public Rotate3dAnimation(float fromDegrees, float toDegrees, boolean turnIn, boolean turnUp) {
mFromDegrees = fromDegrees;
mToDegrees = toDegrees;
mTurnIn = turnIn;
mTurnUp = turnUp;
}

@Override
public void initialize(int width, int height, int parentWidth, int parentHeight) {
super.initialize(width, height, parentWidth, parentHeight);
mCamera = new Camera();
mCenterY = getHeight() / 2;
mCenterX = getWidth() / 2;
}

@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 int derection = mTurnUp ? 1: -1;

final Matrix matrix = t.getMatrix();

camera.save();
if (mTurnIn) {
camera.translate(0.0f, derection *mCenterY * (interpolatedTime - 1.0f), 0.0f);
} else {
camera.translate(0.0f, derection *mCenterY * (interpolatedTime), 0.0f);
}
camera.rotateX(degrees);
camera.getMatrix(matrix);
camera.restore();

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

tv_gonggao = (AutoTextView) findViewById(R.id.xiaoxi_title);
setHeight(90, tv_gonggao);
tv_gonggao.setOnClickListener(this);