ViewFlipper-----AdapterViewFlipper公告栏

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1简介

之前因为项目的要求，需要做一个类似于学校公告栏这么的一个东西（展示公告信息同时每隔多少秒访问一下后台查看是否有新数据若有《动态的添加删除数据》如若数据过长自动下拉到底换页）当时我第一感想就是用viewpager+fragment 于是就动手写了起来后来才发现 viewpager+fragment 写起来没这么简单涉及到 viewpager缓存问题和动态更新数据问题，还有webview 在BaseAdapter 里的getView获取不到getMeasureHeight（网上一些有关这些问题的相关资料乱七八糟）想了想换了其他控件实现了。于是乎简单的介绍一下吧！小demo 如下

测试的时候先添加再删除删除的是第三个元素（2）

package com.refl.wind.myapplication;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.AdapterViewFlipper;import android.widget.Button;import android.widget.ScrollView;import java.util.ArrayList;import java.util.List;public class MainActivity extends AppCompatActivity implements View.OnClickListener ,MyVfAdapter.callback {    private Button b1, b2;    private AdapterViewFlipper adapterViewFlipper;    private MyVfAdapter myVfAdapter;    private ArrayList<String> mlist;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        b1 = (Button) findViewById(R.id.b1);        b2 = (Button) findViewById(R.id.b2);        adapterViewFlipper = (AdapterViewFlipper) findViewById(R.id.flipper);        b1.setOnClickListener(this);        b2.setOnClickListener(this);        myVfAdapter = new MyVfAdapter(MainActivity.this);        mlist = new ArrayList<>();        for (int i = 0; i < 2; i++) {            mlist.add(i + Text.tstr());        }        myVfAdapter.add(mlist);        myVfAdapter.SetCallBack(this);        adapterViewFlipper.setAdapter(myVfAdapter);    }    @Override    public void onClick(View view) {        switch (view.getId()) {            case R.id.b1:                mlist.add("-------->添加数据");                myVfAdapter.updata(mlist);                break;            case R.id.b2:                mlist.remove(2);                myVfAdapter.updata(mlist);                break;        }    }    @Override    public void getCaback(boolean tag) {        if(tag==true){            adapterViewFlipper.startFlipping();        }else {            adapterViewFlipper.stopFlipping();        }    }}

第二页

package com.refl.wind.myapplication;import android.content.Context;import android.os.Handler;import android.util.Log;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.ScrollView;import android.widget.TextView;import android.widget.Toast;import java.util.ArrayList;import java.util.List;public class MyVfAdapter extends BaseAdapter {    private Context context;    private List<String> list;    private List<String> Temlist = new ArrayList<>();    private Handler mhandler;    private ViewHolder mViewHolder;    public MyVfAdapter(Context context) {        this.context = context;        mhandler = new Handler();    }    public void add(List<String> list) {        this.list = list;    }    public void updata(List<String> list) {        if (list.size() == 0) {            list.add("&&&");            this.list.addAll(list);            notifyDataSetChanged();        }    }    @Override    public int getCount() {        return list.size();    }    @Override    public Object getItem(int position) {        return list.get(position);    }    @Override    public long getItemId(int position) {        return position;    }    @Override    public View getView(final int position, View convertView, ViewGroup parent) {        if (convertView == null) {            mViewHolder = new ViewHolder();            convertView = View.inflate(context, R.layout.vp_item, null);            mViewHolder.TXT = (TextView) convertView.findViewById(R.id.TXT);            mViewHolder.TXT.setTextSize(35);            mViewHolder.scrollView = (ScrollView) convertView.findViewById(R.id.mscrollView);            convertView.setTag(mViewHolder);        } else {            mViewHolder = (ViewHolder) convertView.getTag();        }        if (getCount() > 0) {            mViewHolder.TXT.setText(list.get(position).toString());        }        if (myRunnable != null) {            myRunnable = null;        } else {            myRunnable = new myRunnable();        }        mhandler.post(myRunnable);        return convertView;    }    class ViewHolder {        public TextView TXT;        private ScrollView scrollView;    }    //回调s    private callback mCallback;    public interface callback {        public void getCaback(boolean tag);    }    public void SetCallBack(callback mCallback) {        this.mCallback = mCallback;    }    private myRunnable myRunnable;    class myRunnable implements Runnable {        @Override        public void run() {            // 判断高度            int off = mViewHolder.TXT.getMeasuredHeight() - mViewHolder.scrollView.getHeight();            if (off > 0) {                mViewHolder.scrollView.scrollBy(0, 30);                if (mViewHolder.scrollView.getScrollY() == off) {                    Toast.makeText(context, mViewHolder.scrollView.getScrollY() + ":::" + mViewHolder.TXT.getMeasuredHeight() + ":::" + off,Toast.LENGTH_SHORT).show();                    Log.d("Tag", mViewHolder.scrollView.getScrollY() + ":::" + mViewHolder.TXT.getMeasuredHeight() + ":::" + off);                    Thread.currentThread().interrupt();                    mCallback.getCaback(true);                    MyVfAdapter.this.list.addAll(MyVfAdapter.this.list.size(), MyVfAdapter.this.Temlist);                    notifyDataSetChanged();                } else {                    mCallback.getCaback(false);                    mhandler.postDelayed(this, 1000);                }            } else {                mCallback.getCaback(true);                MyVfAdapter.this.list.addAll(MyVfAdapter.this.list.size(), MyVfAdapter.this.Temlist);                notifyDataSetChanged();            }          Toast.makeText(context, mViewHolder.scrollView.getScrollY() + ":::" + mViewHolder.TXT.getMeasuredHeight() + ":::" + off,Toast.LENGTH_SHORT).show();            Log.d("Tag", mViewHolder.scrollView.getScrollY() + ":::" + mViewHolder.TXT.getMeasuredHeight() + ":::" + off);        }    }}

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:fitsSystemWindows="true"    android:orientation="vertical">    <ScrollView        android:id="@+id/mscrollView"        android:layout_width="fill_parent"        android:layout_height="wrap_content">        <TextView            android:id="@+id/TXT"            android:layout_width="fill_parent"            android:layout_height="fill_parent" />    </ScrollView></LinearLayout>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:fitsSystemWindows="true"    android:orientation="vertical">    <AdapterViewFlipper        android:id="@+id/flipper"        android:layout_width="match_parent"        android:layout_height="338dp"        android:layout_alignParentTop="true"        android:layout_marginTop="10dp"        android:flipInterval="3000" />    <Button        android:id="@+id/b1"        android:text="动态添加"        android:layout_width="match_parent"        android:layout_height="wrap_content"        />    <Button        android:text="动态删除"        android:id="@+id/b2"        android:layout_width="match_parent"        android:layout_height="wrap_content" /></LinearLayout>

滚到底部自动换屏可以动态添加数据

这里的TextView 可以获取getMeasureHeight 换成webview 便获取不到挺坑的延时5秒便可获取到可能加载网络问题吧

说的这么多demo最重要如若帮到各位码友们给个好评在下面谢谢

代码下载点击打开链接

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