AutoVerticalScrollTextView.java
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package com.hjx.personalcenter.View;
import android.content.Context;
import android.graphics.Camera;
import android.graphics.Color;
import android.graphics.Matrix;
import android.text.TextUtils;
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;
/**
* 自动垂直滚动的TextView
*/
public class AutoVerticalScrollTextView extends TextSwitcher implements ViewSwitcher.ViewFactory {
private Context mContext;
//mInUp,mOutUp分别构成向下翻页的进出动画
private Rotate3dAnimation mInUp;
private Rotate3dAnimation mOutUp;
public AutoVerticalScrollTextView(Context context) {
this(context, null);
}
public AutoVerticalScrollTextView(Context context, AttributeSet attrs) {
super(context, attrs);
mContext = context;
init();
}
private void init() {
setFactory(this);
mInUp = createAnim(true, true);
mOutUp = createAnim(false, true);
setInAnimation(mInUp);//当View显示时动画资源ID
setOutAnimation(mOutUp);//当View隐藏是动画资源ID。
}
private Rotate3dAnimation createAnim( boolean turnIn, boolean turnUp){
Rotate3dAnimation rotation = new Rotate3dAnimation(turnIn, turnUp);
rotation.setDuration(1200);//执行动画的时间
rotation.setFillAfter(false);//是否保持动画完毕之后的状态
rotation.setInterpolator(new AccelerateInterpolator());//设置加速模式
return rotation;
}
//这里返回的TextView，就是我们看到的View,可以设置自己想要的效果
public View makeView() {
TextView textView = new TextView(mContext);
textView.setGravity(Gravity.LEFT);
textView.setTextSize(20);
textView.setSingleLine(true);
textView.setGravity(Gravity.CENTER_VERTICAL);
textView.setEllipsize(TextUtils.TruncateAt.END);
textView.setTextColor(Color.WHITE);
return textView;
}
//定义动作，向上滚动翻页
public void next(){
//显示动画
if(getInAnimation() != mInUp){
setInAnimation(mInUp);
}
//隐藏动画
if(getOutAnimation() != mOutUp){
setOutAnimation(mOutUp);
}
}
class Rotate3dAnimation extends Animation {
private float mCenterX;
private float mCenterY;
private final boolean mTurnIn;
private final boolean mTurnUp;
private Camera mCamera;
public Rotate3dAnimation(boolean turnIn, boolean turnUp) {
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() ;
mCenterX = getWidth() ;
}
@Override
protected void applyTransformation(float interpolatedTime, Transformation t) {
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.getMatrix(matrix);
camera.restore();
matrix.preTranslate(-centerX, -centerY);
matrix.postTranslate(centerX, centerY);
}
}
}