本文实例为大家分享了android实现滚动文本效果的具体代码，供大家参考，具体内容如下
效果图
实现方法
直接上代码
首先是一个自定义layout，继承自framelayout
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public class animationtextlayout extends framelayout {
private static final string tag = "animationtextlayout";
private list<string> tiplist;
private list<integer> displaylist;
private list<textview> viewlist;
private list<virtualpos> virtualposlist;
private double deviantangle = 0;
public animationtextlayout(@nonnull context context) {
super(context);
initview();
}
public animationtextlayout(@nonnull context context, @nullable attributeset attrs) {
super(context, attrs);
initview();
}
public animationtextlayout(@nonnull context context, @nullable attributeset attrs, int defstyleattr) {
super(context, attrs, defstyleattr);
initview();
}
private void initview() {
viewlist = new arraylist<>();
displaylist = new arraylist<>();
virtualposlist = new arraylist<>();
}
/**
* 设置需要显示的数据
*
* @param data 需要显示的数据
*/
public void setdata(list<string> data) {
this.tiplist = data;
inittips();
}
private void inittips() {
while (tiplist.size() > viewlist.size()) {
addtipsview();
}
refreshtips();
initvirpos();
post(new runnable() {
@override
public void run() {
initposition();
requestlayout();
}
});
}
/**
* 计算虚拟位置
*/
private void initvirpos() {
virtualposlist.clear();
for (int i = 0; i < viewlist.size(); i++) {
double angle = (math.pi * ((double) i / viewlist.size())*2)+(deviantangle*math.pi*2);
if (angle>math.pi*2){
angle-=math.pi*2;
}
virtualpos virtualpos = new virtualpos();
virtualpos.text = tiplist.get(i);
virtualpos.z = 100 * math.sin(angle);
virtualpos.y = 100 * math.cos(angle);
virtualposlist.add(virtualpos);
}
}
/**
* 将虚拟位置转化为实际高度和位置
*/
private void initposition() {
for (int i = 0; i < viewlist.size(); i++) {
textview textview = viewlist.get(i);
virtualpos virtualpos=virtualposlist.get(i);
int realy = (int) ((100 - virtualpos.y)/200 *getmeasuredheight());
framelayout.layoutparams layoutparams = (layoutparams) textview.getlayoutparams();
layoutparams.topmargin = realy;
if (virtualpos.z>=0){
float textsize= (float) (( virtualpos.z)/100)*20+5;
textview.settextsize(textsize);
textview.setvisibility(visible);
}else {
textview.setvisibility(gone);
}
log.d(tag, "initposition: y=="+realy);
}
}
private void refreshtips() {
for (int i = 0; i < viewlist.size(); i++) {
textview tip = viewlist.get(i);
if (i < tiplist.size()) {
tip.setvisibility(visible);
tip.settext(tiplist.get(i));
continue;
}
tip.setvisibility(gone);
}
}
private textview addtipsview() {
textview textview = new textview(getcontext());
textview.settextsize(complex_unit_dip, 12);
textview.settextcolor(color.parsecolor("#444444"));
textview.setpadding(convertutil.dp2px(5), convertutil.dp2px(3), convertutil.dp2px(5), convertutil.dp2px(3));
layoutparams layoutparams = new layoutparams(viewgroup.layoutparams.wrap_content, viewgroup.layoutparams.wrap_content);
layoutparams.gravity=gravity.center_horizontal;
layoutparams.rightmargin = convertutil.dp2px(6);
addview(textview, layoutparams);
viewlist.add(textview);
return textview;
}
/**
* 虚拟位置，最大x,y,z 最大值为100，最小值为-100
*/
public static class virtualpos {
public double x;
public double y;
public double z;
public string text;
}
/**
* 滚动的偏移值
* @param deviantangle 最大为1
*/
public void setdeviantangle(float deviantangle) {
this.deviantangle = deviantangle;
initvirpos();
initposition();
}
public double getdeviantangle() {
return deviantangle;
}
}
调用方布局
<framelayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".animationtextactivity"> <com.lanlengran.test.view.animationtextlayout android:id="@+id/anim_text_layout" android:layout_width="match_parent" android:background="@color/coloraccent" android:layout_height="400dp"/> </framelayout>
调用方代码
public class animationtextactivity extends activity {
private animationtextlayout manimtextlayout;
@override
protected void oncreate(bundle savedinstancestate) {
super.oncreate(savedinstancestate);
setcontentview(r.layout.activity_animation_text);
manimtextlayout = findviewbyid(r.id.anim_text_layout);
list<string> testdata = new arraylist<>();
for (int i = 0; i < 30; i++) {
testdata.add("测试数据" + i);
}
manimtextlayout.setdata(testdata);
objectanimator animator = objectanimator.offloat(manimtextlayout, "deviantangle", 0f, 1f);
animator.setduration(5000);
animator.setrepeatcount(-1);
animator.start();
}
}
注意事项
此处的动画只是为了演示。可以根据需要改变自定view的改变滚动值的方法，就可以使滚轮滚动。例如将滚动的角度和手指拖动相结合啥的
/** * 滚动的偏移值 * @param deviantangle 最大为1 */ public void setdeviantangle(float deviantangle)
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持移动技术网。
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