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Android自定义TextBanner实现自动滚动

2020年07月23日  | 移动技术网移动技术  | 我要评论

本文实例为大家分享了android自定义textbanner实现自动滚动的具体代码，供大家参考，具体内容如下

1、textbanner

package com.example.myapplication.customview;
 
import android.content.context;
import android.util.attributeset;
import android.util.log;
import android.view.layoutinflater;
import android.view.view;
import android.view.viewgroup;
import android.widget.textview;
import android.widget.viewflipper;
 
import com.example.myapplication.r;
 
import java.util.arraylist;
import java.util.list;
 
public class textbanner extends viewgroup {
  private list<string> mdata = new arraylist<>();
  private viewflipper viewflipper;
  private int parentwidthspec;
 
  public textbanner(context context) {
    super(context);
  }
 
  public textbanner(context context, attributeset attrs) {
    super(context, attrs);
  }
 
  public textbanner(context context, attributeset attrs, int defstyleattr) {
    super(context, attrs, defstyleattr);
  }
 
  @override
  protected void onlayout(boolean changed, int l, int t, int r, int b) {
 
 
    int top = 0;
    int bottom = getchildat(0).getmeasuredheight();
 
 
    int left = 0;
    for (int i = 0; i < getchildcount(); i++) {
      view view = getchildat(i);
      left = (parentwidthspec - view.getmeasuredwidth()) / 2;
      view.layout(left, top, left + view.getmeasuredwidth(), bottom);
      top += view.getmeasuredheight();
      bottom = top + view.getmeasuredheight();
 
    }
    log.d("tzg", "bottom: " + bottom);
    log.d("tzg", "top: " + top);
 
 
  }
 
 
  public void setdata(list<string> data) {
    mdata.clear();
    if (data.isempty()) {
      return;
    }
    this.mdata = data;
 
    settextlist();
  }
 
  private void settextlist() {
    viewflipper = (viewflipper) layoutinflater.from(getcontext()).inflate(r.layout.flow_layout_viewflip, this, false);
    for (string mdatum : mdata) {
 
      textview view = (textview) layoutinflater.from(getcontext()).inflate(r.layout.flow_layout_textview, this, false);
      view.settext(mdatum);
      viewflipper.addview(view);
 
    }
    viewflipper.setinanimation(getcontext(), r.anim.come_in);
    viewflipper.setoutanimation(getcontext(), r.anim.come_out);
    viewflipper.setflipinterval(2000);
    addview(viewflipper);
  }
 
 
  @override
  protected void onmeasure(int widthmeasurespec, int heightmeasurespec) {
    super.onmeasure(widthmeasurespec, heightmeasurespec);
 
    parentwidthspec = measurespec.getsize(widthmeasurespec);
    int parentheightspec = measurespec.getsize(heightmeasurespec);
 
 
    int childwidth = measurespec.makemeasurespec(parentwidthspec, measurespec.at_most);
    int childheight = measurespec.makemeasurespec(parentheightspec, measurespec.at_most);
 
    int totalheight = getchildat(0).getmeasuredheight();
 
    for (int i = 0; i < getchildcount(); i++) {
      view view = getchildat(i);
      measurechild(view, childwidth, childheight);
    }
    log.d("tzg", "totalcount: " + totalheight);
    setmeasureddimension(parentwidthspec, totalheight);
 
  }
 
 
  public void startanimation() {
    // 1、设置幻灯片的形式滚动
    // viewflipper.startflipping();
 
    // 2、设置自动翻页滚动
    viewflipper.setautostart(true);
    viewflipper.isautostart();
  }
}

用到的资源 

1、动画资源

（1）、come_in.xml

<set xmlns:android="http://schemas.android.com/apk/res/android">
 
  <translate
    android:duration="1000"
    android:fromydelta="100%p"
    android:toydelta="0"/>
 
</set>

(2)、come_out.xml

<set xmlns:android="http://schemas.android.com/apk/res/android">
 
  <translate
    android:duration="1000"
    android:fromydelta="0"
    android:toydelta="-100%p"/>
 
</set>

2、布局资源

（1）、flow_layout_viewflip.xml

<?xml version="1.0" encoding="utf-8"?>
<viewflipper xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_gravity="center">
</viewflipper>

（2）、flow_layout_textview.xml

<?xml version="1.0" encoding="utf-8"?>
<textview xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:gravity="center"
  android:padding="5dp"
  android:text="demo"
  android:textcolor="#ff00ff" />

3、在mainactivity中的使用

package com.example.myapplication;
 
import androidx.appcompat.app.appcompatactivity;
 
import android.os.bundle;
import android.util.log;
import android.view.view;
import android.widget.linearlayout;
import android.widget.toast;
 
import com.example.myapplication.customview.flowlayout;
import com.example.myapplication.customview.textbanner;
 
import java.util.arraylist;
 
public class mainactivity extends appcompatactivity {
 
  @override
  protected void oncreate(bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    setcontentview(r.layout.activity_main);
    arraylist<string> arraylist = new arraylist<>();
    arraylist.add("111111111");
    arraylist.add("222222222222444444444444");
    arraylist.add("你好5");
    arraylist.add("你好633");
    arraylist.add("你好a7好a7");
    arraylist.add("你好7889");
    arraylist.add("你好2323423423 ");
    arraylist.add("你好sdfsfada你好sdfsfada ");
    arraylist.add("你好34345");
    arraylist.add("pppppppp");
    arraylist.add("你好");
    arraylist.add("你好你好");
    arraylist.add("电视");
    arraylist.add("冰箱冰箱冰箱冰箱冰箱冰箱冰箱冰箱冰箱冰箱");
    arraylist.add("woaoni");
    arraylist.add("袭击");
    arraylist.add("你好");
    arraylist.add("你好");
    textbanner viewbyid = this.findviewbyid(r.id.text_banner);
    viewbyid.setdata(arraylist);
    viewbyid.startanimation();
  }
}

具体效果

没有自测哦  有bug自己解决

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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