Android listview动态添加删除测试
fmms
12年前
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 addlist delidlist.clear() ; addlist.clear() ; } adapter.notifyDataSetChanged(); } @Override protected 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() { @Override public 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; } } @Override public 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{ @Override public 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 { @Override public int getCount() { return listdatas.keySet().size(); } @Override public 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key Object[] d = listdatas.keySet().toArray() ; int c = (Integer)d[position] ; // Log.i(TAG, "~~~~~getItem~~position["+position+"] [c="+c+"]") ; return listdatas.get(c) ; } @Override public long getItemId(int position) { return ((ListInfo)this.getItem(position)).id ; } @Override public 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; } @Override public 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 ; } @Override public 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") ; } } } @Override public 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
