Android 实现文字滚动效果,自己写了个timer小计时器,textview文字上下翻动效果:
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, 16);
a.recycle();
mContext = context;
init();
}
private void init() {
// TODO Auto-generated method stub
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);
//TextSwitcher主要用于文件切换,比如 从文字A 切换到 文字 B,
//setInAnimation()后,A将执行inAnimation,
//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(16);
t.setMaxLines(1);
t.setTextColor(mContext.getResources().getColor(R.color.textColor));
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);
}
}
demo下载链接:http://xiazai.jb51.net/201611/yuanma/AndroidTextView(jb51.net).rar
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