首先看看效果：
///项目布局
attrs.xml 自定义属性，该属性主要是控制动画播放的时间
<?
xml version="1.0" encoding="utf-8"
?>
< resources >
< declare-styleable name ="SlidingText" >
< attr name ="animationDuration" format ="integer" />
</ declare-styleable >
</ resources >
< resources >
< declare-styleable name ="SlidingText" >
< attr name ="animationDuration" format ="integer" />
</ declare-styleable >
</ resources >
/ main.xml
<?
xml version="1.0" encoding="utf-8"
?>
< LinearLayout xmlns:android ="http://schemas.android.com/apk/res/android"
android:orientation ="vertical" android:layout_width ="fill_parent"
xmlns:slidingtext ="http://schemas.android.com/apk/res/com.testSildingTextView"
android:layout_height ="fill_parent" >
< com.testSildingTextView.SlidingTextView
android:id ="@+id/sliding_textview" android:layout_width ="fill_parent"
android:layout_height ="wrap_content"
slidingtext:animationDuration ="500"
android:layout_gravity ="center" >
< TextView android:layout_width ="fill_parent" android:gravity ="center_horizontal"
android:layout_height ="wrap_content" android:text ="sssssss" />
</ com.testSildingTextView.SlidingTextView >
</ LinearLayout >
< LinearLayout xmlns:android ="http://schemas.android.com/apk/res/android"
android:orientation ="vertical" android:layout_width ="fill_parent"
xmlns:slidingtext ="http://schemas.android.com/apk/res/com.testSildingTextView"
android:layout_height ="fill_parent" >
< com.testSildingTextView.SlidingTextView
android:id ="@+id/sliding_textview" android:layout_width ="fill_parent"
android:layout_height ="wrap_content"
slidingtext:animationDuration ="500"
android:layout_gravity ="center" >
< TextView android:layout_width ="fill_parent" android:gravity ="center_horizontal"
android:layout_height ="wrap_content" android:text ="sssssss" />
</ com.testSildingTextView.SlidingTextView >
</ LinearLayout >
首先自定义名称xmlns:slidingtext=http://schemas.android.com/apk/res/com.testSildingTextView
这里使用了自定义的名称
slidingtext:animationDuration="500"
下面是动画效果的关键代码，大概说明一下它的功能。这个动画效果主要是每次开出一条线程来运行的，首次运行后等2点5秒，就将textview以动画效果向左运行，等0.5秒后从右边出现，动画结束后隐藏，不断循环
/ SlidingTextView
private
String[] showTexts
=
new
String[] {
"
ssssss
"
,
"
aaaaaa
"
,
"
bbbbbb
"
};
// 用来记录显示哪个字符串
private int count = 0 ;
private int mDuration;
private TextView text;
private int textWidth = 200 ;
// 获取自定义变量
public SlidingTextView(Context context, AttributeSet attrs) {
super (context, attrs);
TypedArray a = context.obtainStyledAttributes(attrs,
R.styleable.SlidingText);
mDuration = a
.getInteger(R.styleable.SlidingText_animationDuration, 750 );
}
// 设置要显示的字符串
public void setShowText(String[] showTexts){
this .showTexts = showTexts;
}
// 回调函数 界面初始化快结束时调用
protected void onFinishInflate() {
super .onFinishInflate();
text = (TextView) this .getChildAt( 0 );
mHandler.postDelayed(appear, 1000 );
}
private Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
// 1为出现，2为隐藏
switch (msg.arg1) {
case 1 :
doAnimationOpen();
break ;
case 2 :
doAnimationClose();
break ;
}
}
};
public void doAnimationOpen() {
post(appear);
}
// 出现的效果
Runnable appear = new Runnable() {
public void run() {
TranslateAnimation animation;
int fromXDelta = 0 , toXDelta = 0 , fromYDelta = 0 , toYDelta = 0 ;
int calculatedDuration = 0 ;
fromXDelta = textWidth;
toXDelta = 0 ;
calculatedDuration = mDuration * Math.abs(toXDelta - fromXDelta)
/ textWidth;
animation = new TranslateAnimation(fromXDelta, toXDelta,
fromYDelta, toYDelta);
animation.setDuration(calculatedDuration);
animation.setAnimationListener( new AnimationListener() {
@Override
public void onAnimationStart(Animation animation) {
if (showTexts.length != 0 ){
count = (count + 1 ) % showTexts.length;
text.setText(showTexts[count]);
}
text.setVisibility(VISIBLE);
}
@Override
public void onAnimationRepeat(Animation animation) {
}
@Override
public void onAnimationEnd(Animation animation) {
mHandler.postDelayed(hide, 2500 );
}
});
startAnimation(animation);
}
};
public void doAnimationClose() {
post(hide);
}
// 隐藏的效果
Runnable hide = new Runnable() {
public void run() {
TranslateAnimation animation;
int fromXDelta = 0 , toXDelta = 0 , fromYDelta = 0 , toYDelta = 0 ;
int calculatedDuration = 0 ;
toXDelta = - 1 * textWidth;
calculatedDuration = mDuration * Math.abs(toXDelta - fromXDelta)
/ textWidth;
animation = new TranslateAnimation(fromXDelta, toXDelta,
fromYDelta, toYDelta);
animation.setDuration(calculatedDuration);
animation.setAnimationListener( new AnimationListener() {
@Override
public void onAnimationStart(Animation animation) {
}
@Override
public void onAnimationRepeat(Animation animation) {
}
// 动画结束时 设置textview的状态
@Override
public void onAnimationEnd(Animation animation) {
mHandler.postDelayed(appear, 500 );
text.setVisibility(INVISIBLE);
}
});
startAnimation(animation);
}
};
// 用来记录显示哪个字符串
private int count = 0 ;
private int mDuration;
private TextView text;
private int textWidth = 200 ;
// 获取自定义变量
public SlidingTextView(Context context, AttributeSet attrs) {
super (context, attrs);
TypedArray a = context.obtainStyledAttributes(attrs,
R.styleable.SlidingText);
mDuration = a
.getInteger(R.styleable.SlidingText_animationDuration, 750 );
}
// 设置要显示的字符串
public void setShowText(String[] showTexts){
this .showTexts = showTexts;
}
// 回调函数 界面初始化快结束时调用
protected void onFinishInflate() {
super .onFinishInflate();
text = (TextView) this .getChildAt( 0 );
mHandler.postDelayed(appear, 1000 );
}
private Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
// 1为出现，2为隐藏
switch (msg.arg1) {
case 1 :
doAnimationOpen();
break ;
case 2 :
doAnimationClose();
break ;
}
}
};
public void doAnimationOpen() {
post(appear);
}
// 出现的效果
Runnable appear = new Runnable() {
public void run() {
TranslateAnimation animation;
int fromXDelta = 0 , toXDelta = 0 , fromYDelta = 0 , toYDelta = 0 ;
int calculatedDuration = 0 ;
fromXDelta = textWidth;
toXDelta = 0 ;
calculatedDuration = mDuration * Math.abs(toXDelta - fromXDelta)
/ textWidth;
animation = new TranslateAnimation(fromXDelta, toXDelta,
fromYDelta, toYDelta);
animation.setDuration(calculatedDuration);
animation.setAnimationListener( new AnimationListener() {
@Override
public void onAnimationStart(Animation animation) {
if (showTexts.length != 0 ){
count = (count + 1 ) % showTexts.length;
text.setText(showTexts[count]);
}
text.setVisibility(VISIBLE);
}
@Override
public void onAnimationRepeat(Animation animation) {
}
@Override
public void onAnimationEnd(Animation animation) {
mHandler.postDelayed(hide, 2500 );
}
});
startAnimation(animation);
}
};
public void doAnimationClose() {
post(hide);
}
// 隐藏的效果
Runnable hide = new Runnable() {
public void run() {
TranslateAnimation animation;
int fromXDelta = 0 , toXDelta = 0 , fromYDelta = 0 , toYDelta = 0 ;
int calculatedDuration = 0 ;
toXDelta = - 1 * textWidth;
calculatedDuration = mDuration * Math.abs(toXDelta - fromXDelta)
/ textWidth;
animation = new TranslateAnimation(fromXDelta, toXDelta,
fromYDelta, toYDelta);
animation.setDuration(calculatedDuration);
animation.setAnimationListener( new AnimationListener() {
@Override
public void onAnimationStart(Animation animation) {
}
@Override
public void onAnimationRepeat(Animation animation) {
}
// 动画结束时 设置textview的状态
@Override
public void onAnimationEnd(Animation animation) {
mHandler.postDelayed(appear, 500 );
text.setVisibility(INVISIBLE);
}
});
startAnimation(animation);
}
};
本文为原创，如需转载，请注明作者和出处，谢谢！
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