Android DownloadManager 使用

Aandroid 3.2 加入了DownloadManager ，这里举例使用方法。

layout添加两个个button，两个txtview

                    <?xmlversion="1.0"encoding="utf-8"?>
            <LinearLayout
            xmlns:android="http://schemas.android.com/apk/res/android"
            android:orientation="vertical"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            >
            <Button
            android:id="@+id/start"
            android:text="StartDownload"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:onClick="startDownload"
            />
            <Button
            android:id="@+id/query"
            android:text="QueryStatus"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:onClick="queryDownloadStatus"
            
            />
            <Button
            android:id="@+id/del"
            android:text="deldownload"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:onClick="delDownloads"
            
            />
            
            <TextViewandroid:id="@+id/tvsize"
            android:text="file"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"/>
            
            <TextViewandroid:id="@+id/tvinfo"
            android:text="file"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"/>
            </LinearLayout>

                    packagecom.download;
            
            
            importandroid.app.Activity;
            importandroid.app.DownloadManager;
            importandroid.app.DownloadManager.Request;
            importandroid.content.Intent;
            importandroid.database.Cursor;
            importandroid.net.Uri;
            importandroid.os.Bundle;
            importandroid.os.Environment;
            importandroid.os.Handler;
            importandroid.os.Message;
            importandroid.util.Log;
            importandroid.view.View;
            importandroid.widget.TextView;
            importandroid.widget.Toast;
            
            publicclassDWManagerThreadextendsActivity{
            
            privateDownloadManagermgr=null;
            privatelonglastDownload=-1L;
            
            TextViewtvdwsize;
            TextViewtvdwinfo=null;
            
            privateStringstrUrl="http://dl.google.com/android/ndk/android-ndk-r6-linux-x86.tar.bz2";
            publicstaticfinalintMSG_DWPACKSIZE=1;
            publicstaticfinalintMSG_DWSIZE=2;
            
            handleMessage()*/
            Handlerhandler=newHandler(){
            publicvoidhandleMessage(Messagemsg){
            //bar.incrementProgressBy(5);
            switch(msg.what){
            caseMSG_DWPACKSIZE:
            Stringsize=String.valueOf(msg.arg1);
            tvdwinfo.setText(size);
            Log.d("handleMessage","dwpacksize="+size);
            break;
            caseMSG_DWSIZE:
            Stringdwsize=String.valueOf(msg.arg1);
            tvdwsize.setText(dwsize);
            Log.d("handleMessage","dwsize="+dwsize);
            break;
            default:
            break;
            }
            
            }
            };
            
            @Override
            publicvoidonCreate(BundlesavedInstanceState){
            super.onCreate(savedInstanceState);
            setContentView(R.layout.main);
            
             
            tvdwsize=(TextView)findViewById(R.id.tvsize); 
            tvdwinfo=(TextView)findViewById(R.id.tvinfo);
            
            mgr=(DownloadManager)getSystemService(DOWNLOAD_SERVICE);
            
            }
            
            
            publicvoidstartDownload(Viewv){
            Uriuri=Uri.parse(strUrl);
            
            Environment
            .getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS)
            .mkdirs();
            
            Requestdwreq=newDownloadManager.Request(uri);
            
            dwreq.setTitle("Demo");
            dwreq.setDescription("android-ndk-r6-linux-x86.tar.bz2");
            dwreq.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS,"android-ndk-r6-linux-x86.tar.bz2");
            dwreq.setNotificationVisibility(0); 
            dwreq.setShowRunningNotification(true);
            
            lastDownload=mgr.enqueue(dwreq); 
            
            
            }
            
            
            publicvoidqueryDownloadStatus(Viewv){
            
            RunnablequeryRunable=newRunnable(){
            longtotalsize=0;
            longdowsize=0;
            booleandownok=false;
            Cursorc=null;
            
            publicvoidrun(){
            
            //查询下载文件总大小
            totalsize=c.getLong(c.getColumnIndex(DownloadManager.COLUMN_TOTAL_SIZE_BYTES));
            
            Messagemsg_packsize=newMessage();
            msg_packsize.what=MSG_DWPACKSIZE;
            msg_packsize.arg1=(int)totalsize;
            handler.sendMessage(msg_packsize);
            
            while(downok==false){
            c=mgr.query(newDownloadManager.Query().setFilterById(lastDownload));
            
            if(c==null){
            //tvdwsize.setText("query=null");
            }
            else{
            c.moveToFirst();
            //查询已经下载的大小
            dowsize=c.getLong(c.getColumnIndex(DownloadManager.COLUMN_BYTES_DOWNLOADED_SO_FAR));
            if(totalsize==dowsize)downok=true;
            }
            
            Messagemsg=newMessage();
            msg.what=MSG_DWSIZE;
            msg.arg1=(int)dowsize;
            handler.sendMessage(msg);
            
            try{
            Thread.sleep(5000);
            }catch(InterruptedExceptione){
            //TODOAuto-generatedcatchblock
            e.printStackTrace();
            }
            c.close();
            }
            }//run
            };
            
            Threadbackground=newThread(queryRunable);
            background.start();
            }
            
            publicvoiddelDownloads(Viewview){
            
            Toast.makeText(this,"delDownloads",Toast.LENGTH_LONG).show();
            mgr.remove(lastDownload);
            
            
            }
        
//查看下载窗口
                    publicvoidviewDownWindow(Viewv){
            startActivity(newIntent(DownloadManager.ACTION_VIEW_DOWNLOADS));
            }
            
            
            }

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