Android(安卓)listview动态添加删除测试

最近在学习Android ,listview会经常使用到.做了些测试.有问题请指正.大家一起讨论.

ListviewTest.java Activity类

import java.util.ArrayList;import java.util.LinkedHashMap;import java.util.List;import java.util.Random;import android.app.Activity;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.util.Log;import android.view.LayoutInflater;import android.view.View;import android.view.View.OnClickListener;import android.view.ViewGroup;import android.widget.AbsListView;import android.widget.AbsListView.OnScrollListener;import android.widget.BaseAdapter;import android.widget.Button;import android.widget.ListView;import android.widget.ProgressBar;import android.widget.TextView;public class ListviewTest  extends Activity implements OnClickListener{int jobcounter = 0 ;private static final int ADDJOB = 1001;private static final int PROCESSADD = 1002;private static final int PROCESSDONE = 1003;private static final int ITEMBUTTON_CLICKED = 1004;private static final String TAG = "ListviewTest";protected static final long REFRESH_INTERVAL = 100; protected boolean mBusy = false ;long lastupdatetime = 0 ;Object lock = new Object() ;ListView listview ;Button buttonadd ;AddjavaListAdapter adapter ;LayoutInflater inflater ;LinkedHashMap<Integer, ListInfo> listdatas ;LinkedHashMap<Integer, ListInfo> addlist = new LinkedHashMap<Integer, ListviewTest.ListInfo>() ;List<Integer> delidlist = new ArrayList<Integer>() ;Handler mainhandler = new Handler(){public void handleMessage(android.os.Message msg) {long v = System.currentTimeMillis() - lastupdatetime ;switch (msg.what) {case ADDJOB://if (inView(msg.arg1) && !mBusy) {//Log.i(TAG, " ADDJOB done!") ;updateListView();lastupdatetime += REFRESH_INTERVAL ;//}break;case PROCESSADD:if ( !mBusy && v>REFRESH_INTERVAL) {updateListView();lastupdatetime = System.currentTimeMillis() ;}break;case ITEMBUTTON_CLICKED:{if(!listdatas.get(msg.arg1).running ) {synchronized (listdatas.get(msg.arg1).lock) {listdatas.get(msg.arg1).lock.notifyAll() ;}} listdatas.get(msg.arg1).running = !listdatas.get(msg.arg1).running ;if ( !mBusy ) {updateListView();lastupdatetime += REFRESH_INTERVAL ;}break;}case PROCESSDONE://Log.i(TAG, " PROCESSDONE done!"+msg.arg1) ;synchronized (lock) {delidlist.add(msg.arg1) ;}updateListView();lastupdatetime += REFRESH_INTERVAL ;break;default:break;}};};void updateListView(){synchronized (lock) {for (Integer delid : delidlist) {Log.i(TAG, " PROCESSDONE done!"+delid) ;listdatas.remove(delid) ;}listdatas.putAll(addlist) ;for (ListInfo info : addlist.values()) {//启动工作线程new WorkThread("workthread#"+jobcounter,info).start() ;jobcounter++ ;}//清空 delidlist 和 addlistdelidlist.clear() ;addlist.clear() ;}adapter.notifyDataSetChanged();}@Overrideprotected void onCreate(Bundle savedInstanceState) {listdatas  = new LinkedHashMap<Integer, ListInfo>() ;super.onCreate(savedInstanceState);setContentView(R.layout.listviewtest);listview = (ListView) findViewById(R.id.listView001) ;adapter = new AddjavaListAdapter();listview.setAdapter(adapter) ;//设置 当listview 进行上下拖动操作时的状态listview.setOnScrollListener( new OnScrollListener() {@Overridepublic void onScrollStateChanged(AbsListView view, int scrollState) {switch (scrollState) {        case OnScrollListener.SCROLL_STATE_IDLE:            mBusy = false;                        break;        case OnScrollListener.SCROLL_STATE_TOUCH_SCROLL:            mBusy = true;            break;        case OnScrollListener.SCROLL_STATE_FLING:            mBusy = true;            break;        }}@Overridepublic void onScroll(AbsListView view, int firstVisibleItem,int visibleItemCount, int totalItemCount) {}}) ;buttonadd  = (Button) findViewById(R.id.button_listaddjob);buttonadd.setOnClickListener(this);inflater = LayoutInflater.from(this);  }// 存放单条 listview 的数据class ListInfo{@Overridepublic String toString() {return "ListInfo [index=" + index + ", id=" + id + ", running="+ running + ", title=" + title + ", process=" + process+ "]";}int index ;long id ;boolean running = true ;String title  ;int process ;Object lock = new Object();}class ViewHodler{TextView text ;ProgressBar bar ;Button button ;ItemClickListener listener;}// listview的适配器class AddjavaListAdapter extends BaseAdapter {@Overridepublic int getCount() {return listdatas.keySet().size();}@Overridepublic Object getItem(int position) {//从 listdata里获取 对应的数据 ,因为有删除的缘故.在有任务完成后 position不等于listdata的keyObject[] d = listdatas.keySet().toArray() ;int c = (Integer)d[position] ;//Log.i(TAG, "~~~~~getItem~~position["+position+"] [c="+c+"]") ;return listdatas.get(c) ;}@Overridepublic long getItemId(int position) {return ((ListInfo)this.getItem(position)).id ;}@Overridepublic View getView(int position, View v, ViewGroup parent) {ViewHodler holder ;//  获取单条item 的view对象if (v==null) {v = inflater.inflate(R.layout.listview_item, null) ;holder = new ViewHodler() ;holder.text = (TextView) v.findViewById(R.id.textView_item) ;holder.bar = (ProgressBar) v.findViewById(R.id.progressBar_item);holder.button = (Button) v.findViewById(R.id.button_item) ;holder.listener = new ItemClickListener() ;v.setTag(holder) ;}else{holder = (ViewHodler) v.getTag();}//将数据显示到每个对应的 view上.final ListInfo data = (ListInfo)getItem(position) ;holder.listener.setId(data.index) ;holder.button.setOnClickListener(holder.listener) ;holder.text.setText(data.title) ;holder.bar.setProgress(data.process) ;if (data.running) {holder.button.setText(R.string.item_stop) ;}else{holder.button.setText(R.string.item_start) ;}return v;}}class ItemClickListener implements  OnClickListener{private int id ;public void setId(int id) {this.id = id;}@Overridepublic void onClick(View v) {Log.i(TAG,"button clicked! "+id +"|"+listdatas.get(id).running+"-->"+!listdatas.get(id).running);sendMessageToHandler(ITEMBUTTON_CLICKED,id) ;}}class WorkThread extends Thread{ListInfo in ;public WorkThread(String name ,ListInfo in){super(name) ;this.in = in ;}@Overridepublic void run() {ListInfo sdata = listdatas.get(in.index) ;while(sdata.process<100) {//如果暂停 则等待if(!listdatas.get(in.index).running ) {synchronized (listdatas.get(in.index).lock) {try {listdatas.get(in.index).lock.wait() ;} catch (InterruptedException e) {e.printStackTrace();}}} //模拟耗时任务操作try {Thread.sleep((int)(3000*new Random().nextDouble()));} catch (InterruptedException e) {e.printStackTrace();}sdata.process += new Random().nextInt(15)+1 ;sendMessageToHandler(PROCESSADD,in.index) ;}//发送任务结束消息if (sdata.process>=100) {sendMessageToHandler(PROCESSDONE,in.index) ;//Log.i(TAG, this.getName()+"#done") ;}}}@Overridepublic void onClick(View v) {switch (v.getId()) {case R.id.button_listaddjob:{ListInfo info = new ListInfo() ;info.title = "file" + jobcounter ;info.process = 0 ;info.id = jobcounter ;info.index = jobcounter ;synchronized (lock) {addlist.put(jobcounter, info) ;}sendMessageToHandler(ADDJOB,jobcounter) ;break;}default:break;}}void sendMessageToHandler(int what,int arg1){Message message = mainhandler.obtainMessage() ;message.what = what ;message.arg1 = arg1 ;message.sendToTarget() ;}}

布局文件 listview_item.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:id="@+id/listview_item"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:orientation="horizontal" >    <TextView        android:id="@+id/textView_item"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_gravity="center_vertical"        android:text="TextView" />    <ProgressBar        android:id="@+id/progressBar_item"        style="?android:attr/progressBarStyleHorizontal"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_gravity="center_vertical"        android:layout_weight="0.75" />    <Button        android:id="@+id/button_item"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_gravity="center_vertical"        android:focusable="false"        android:text="@string/start" />        </LinearLayout>

布局文件 listviewtext.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical" >        <Button        android:id="@+id/button_listaddjob"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="@string/add" />    <ListView        android:id="@+id/listView001"        android:layout_width="match_parent"        android:layout_height="wrap_content" >    </ListView></LinearLayout>

程序运行效果

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