Android文件下載及自定義通知顯示下載進度

jopen 10年前發布 | 42K 次閱讀 Android Android開發移動開發

主要實現了一下幾個類：

（1）文件下載：設計自定義類，只需傳入一個Handler、下載地址URLStr及保存路徑及可實現下載的功能。handler主要用于線程間通信，跟新通知中的進度條。

對于handler發送消息更新ＵＩ線程實現進度展示的時候一定注意不要太過頻繁，過設置計數器隔一定時間才發送消息，不然容易引起系統奔潰

(2) 通知(Notification):提供系統默認自帶形式以及自定義通知欄布局兩種形式。

(3) 服務：后臺服務，startService啟動模式

    package com.example.test;  

    import java.io.BufferedInputStream;  
    import java.io.File;  
    import java.io.FileNotFoundException;  
    import java.io.FileOutputStream;  
    import java.io.IOException;  
    import java.io.InputStream;  
    import java.net.HttpURLConnection;  
    import java.net.MalformedURLException;  

    import android.annotation.SuppressLint;  
    import android.os.Environment;  
    import android.os.Handler;  
    import android.os.Message;  
    import android.os.StrictMode;  
    import android.util.Log;  

    @SuppressLint("NewApi")  
    public class DownFileThread implements Runnable {  
        public final static int DOWNLOAD_COMPLETE = -2;   
        public final static int DOWNLOAD_FAIL = -1;  
        public final static String TAG = "DownFileThread";  
        Handler mHandler; //傳入的Handler,用于像Activity或service通知下載進度  
        String urlStr;  //下載URL  
        File apkFile;   //文件保存路徑  
        boolean isFinished; //下載是否完成  
        boolean interupted=false;  //是否強制停止下載線程  
        public DownFileThread(Handler handler,String urlStr,String filePath)  
        {  
            Log.i(TAG, urlStr);  
            this.mHandler=handler;  
            this.urlStr=urlStr;  
            apkFile=new File(filePath);  
            isFinished=false;  
        }  
        public File getApkFile()  
        {  
            if(isFinished)  
                return apkFile;  
            else  
                return null;  
        }  
        public boolean isFinished() {  
            return isFinished;  
        }  

        /** 
         * 強行終止文件下載 
         */  
        public void  interuptThread()  
        {  
            interupted=true;  
        }  

        @Override  
        public void run() {  
            // TODO Auto-generated method stub  
            if (Environment.getExternalStorageState().equals(  
                    Environment.MEDIA_MOUNTED)) {  
                java.net.URL url = null;  
                HttpURLConnection conn = null;  
                InputStream iStream = null;  
    //          if (DEVELOPER_MODE)  
                {  
                     StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder()  
                             .detectDiskReads()  
                             .detectDiskWrites()  
                             .detectNetwork()   // or .detectAll() for all detectable problems  
                             .penaltyLog()  
                             .build());  
                     StrictMode.setVmPolicy(new StrictMode.VmPolicy.Builder()  
                             .detectLeakedSqlLiteObjects()  
                             .detectLeakedClosableObjects()  
                             .penaltyLog()  
                             .penaltyDeath()  
                             .build());  
                 }  
                try {  
                    url = new java.net.URL(urlStr);  
                    conn = (HttpURLConnection) url.openConnection();  
                    conn.setConnectTimeout(5000);  
                    conn.setReadTimeout(20000);  
                    iStream = conn.getInputStream();  
                } catch (MalformedURLException e) {  
                    Log.i(TAG, "MalformedURLException");  
                    e.printStackTrace();  
                } catch (Exception e) {  
                    Log.i(TAG, "獲得輸入流失敗");  
                    e.printStackTrace();  
                }  
                FileOutputStream fos = null;  
                try {  
                    fos = new FileOutputStream(apkFile);  
                } catch (FileNotFoundException e) {  
                     Log.i(TAG, "獲得輸出流失敗：new FileOutputStream(apkFile);");  
                    e.printStackTrace();  
                }  
                BufferedInputStream bis = new BufferedInputStream(iStream);  
                byte[] buffer = new byte[1024];  
                int len;  
                // 獲取文件總長度  
                int length = conn.getContentLength();  
                double rate=(double)100/length;  //最大進度轉化為100  
                int total = 0;  
                int times=0;//設置更新頻率，頻繁操作ＵＩ線程會導致系統奔潰  
                try {  
                     Log.i("threadStatus", "開始下載");  
                    while (false==interupted  && ((len = bis.read(buffer)) != -1)) {  
                        fos.write(buffer, 0, len);  
                        // 獲取已經讀取長度  

                        total += len;  
                        int p=(int)(total*rate);  
                        Log.i("num", rate+","+total+","+p);  
                        if(times>=512 || p==100)  
                        {/* 
                        這是防止頻繁地更新通知，而導致系統變慢甚至崩潰。  
                                                                 非常重要。。。。。*/  
                            Log.i("time", "time");  
                            times=0;  
                            Message msg = Message.obtain();  
                            msg.what =p ;   
                            mHandler.sendMessage(msg);  
                        }  
                        times++;  
                    }  
                    fos.close();  
                    bis.close();  
                    iStream.close();  
                    if(total==length)  
                    {  
                        isFinished=true;  
                        mHandler.sendEmptyMessage(DOWNLOAD_COMPLETE);  
                        Log.i(TAG, "下載完成結束");  
                    }  
                     Log.i(TAG, "強制中途結束");  
                    //mhandler.sendEmptyMessage(4);  
                } catch (IOException e) {  
                    Log.i(TAG, "異常中途結束");  
                    mHandler.sendEmptyMessage(DOWNLOAD_FAIL);  
                    e.printStackTrace();  
                }  
            }  
            else  
            {  
                Log.i(TAG, "外部存儲卡不存在，下載失敗！");  
                mHandler.sendEmptyMessage(DOWNLOAD_FAIL);  
            }  
        }  
    }

    package com.example.test;  

    import android.app.Notification;  
    import android.app.NotificationManager;  
    import android.app.PendingIntent;  
    import android.content.Context;  
    import android.widget.RemoteViews;  
    /**  
     * Notification類，既可用系統默認的通知布局，也可以用自定義的布局  
     *   
     * @author lz  
     *  
     */  
    public class MyNotification {  
        public final static int DOWNLOAD_COMPLETE = -2;   
        public final static int DOWNLOAD_FAIL = -1;  
        Context mContext;   //Activity或Service上下文  
        Notification notification;  //notification  
        NotificationManager nm;   
        String titleStr;   //通知標題  
        String contentStr; //通知內容  
        PendingIntent contentIntent; //點擊通知后的動作  
        int notificationID;   //通知的唯一標示ID  
        int iconID;         //通知欄圖標  
        long when = System.currentTimeMillis();    
        RemoteViews remoteView=null;  //自定義的通知欄視圖  
        /**  
         *   
         * @param context Activity或Service上下文  
         * @param contentIntent  點擊通知后的動作  
         * @param id    通知的唯一標示ID  
         */  
        public MyNotification(Context context,PendingIntent contentIntent,int id) {  
            // TODO Auto-generated constructor stub  
            mContext=context;  
            notificationID=id;  
            this.contentIntent=contentIntent;  
            this.nm=(NotificationManager)mContext.getSystemService(Context.NOTIFICATION_SERVICE);   
        }  

        /**  
         * 顯示自定義通知  
         * @param icoId 自定義視圖中的圖片ID  
         * @param titleStr 通知欄標題  
         * @param layoutId 自定義布局文件ID  
         */  
        public void showCustomizeNotification(int icoId,String titleStr,int layoutId) {    
            this.titleStr=titleStr;  
            notification=new Notification(R.drawable.ic_launcher, titleStr, when);  
            notification.flags = Notification.FLAG_ONLY_ALERT_ONCE;   
            notification.flags |= Notification.FLAG_AUTO_CANCEL;  
            notification.contentIntent=this.contentIntent;    

            // 1、創建一個自定義的消息布局 view.xml    
            // 2、在程序代碼中使用RemoteViews的方法來定義image和text。然后把RemoteViews對象傳到contentView字段    
            if(remoteView==null)  
            {  
                remoteView = new RemoteViews(mContext.getPackageName(),layoutId);    
                remoteView.setImageViewResource(R.id.ivNotification,icoId);    
                remoteView.setTextViewText(R.id.tvTitle, titleStr);   
                remoteView.setTextViewText(R.id.tvTip, "開始下載");   
                remoteView.setProgressBar(R.id.pbNotification, 100, 0, false);  
                notification.contentView = remoteView;    
            }   
             nm.notify(notificationID, notification);  
        }    
        /**  
         * 更改自定義布局文件中的進度條的值  
         * @param p 進度值(0~100)  
         */  
        public void changeProgressStatus(int p)  
        {  
            if(notification.contentView!=null)  
            {  
                if(p==DOWNLOAD_FAIL)  
                    notification.contentView.setTextViewText(R.id.tvTip , "下載失敗！ ");   
                else if(p==100)  
                    notification.contentView.setTextViewText(R.id.tvTip , "下載完成，請點擊安裝");   
                else                  
                    notification.contentView.setTextViewText(R.id.tvTip , "進度("+p+"%) : ");   
                notification.contentView.setProgressBar(R.id.pbNotification, 100, p, false);  
            }  
            nm.notify(notificationID, notification);  
        }  
        public void changeContentIntent(PendingIntent intent)  
        {  
            this.contentIntent=intent;  
            notification.contentIntent=intent;  
        }  
      /**  
       * 顯示系統默認格式通知  
       * @param iconId 通知欄圖標ID  
       * @param titleText 通知欄標題  
       * @param contentStr 通知欄內容  
       */  
        public void showDefaultNotification(int iconId,String titleText,String contentStr) {    
            this.titleStr=titleText;  
            this.contentStr=contentStr;  
            this.iconID=iconId;  

            notification=new Notification();  
            notification.tickerText=titleStr;  
            notification.icon=iconID;  
            notification.flags = Notification.FLAG_INSISTENT;  
            notification.flags |= Notification.FLAG_AUTO_CANCEL;  
            notification.contentIntent=this.contentIntent;  

            // 添加聲音效果    
            // notification.defaults |= Notification.DEFAULT_SOUND;    

            // 添加震動,后來得知需要添加震動權限 : Virbate Permission    
            // mNotification.defaults |= Notification.DEFAULT_VIBRATE ;     

            //添加狀態標志     
            //FLAG_AUTO_CANCEL        該通知能被狀態欄的清除按鈕給清除掉    
            //FLAG_NO_CLEAR           該通知能被狀態欄的清除按鈕給清除掉    
            //FLAG_ONGOING_EVENT      通知放置在正在運行    
            //FLAG_INSISTENT          通知的音樂效果一直播放    
            notification.flags = Notification.FLAG_ONLY_ALERT_ONCE;    
            changeNotificationText(contentStr);  
        }  
        /**  
         * 改變默認通知欄的通知內容  
         * @param content  
         */  
        public void changeNotificationText(String content)  
        {  
            notification.setLatestEventInfo(mContext, titleStr, content,contentIntent);    

            // 設置setLatestEventInfo方法,如果不設置會App報錯異常    
            //  NotificationManager mNotificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);    
            //注冊此通知     
            // 如果該NOTIFICATION_ID的通知已存在，會顯示最新通知的相關信息 ，比如tickerText 等    
            nm.notify(notificationID, notification);    
        }  

        /**  
         * 移除通知  
         */  
        public void removeNotification()    
        {    
            // 取消的只是當前Context的Notification    
            nm.cancel(notificationID);    
        }    

    }

package com.example.test;  

import java.io.File;  

import android.app.Notification;  
import android.app.NotificationManager;  
import android.app.PendingIntent;  
import android.app.Service;  
import android.content.Context;  
import android.content.Intent;  
import android.net.Uri;  
import android.os.Environment;  
import android.os.Handler;  
import android.os.IBinder;  
import android.os.Message;  
import android.provider.Settings.Global;  
import android.util.Log;  

public class DownloadServices extends Service {  
    private final static int DOWNLOAD_COMPLETE = -2;   
    private final static int DOWNLOAD_FAIL = -1;  

    //自定義通知欄類  
    MyNotification myNotification;  

    String filePathString; //下載文件絕對路徑(包括文件名)  

    //通知欄跳轉Intent  
    private Intent updateIntent = null;  
    private PendingIntent updatePendingIntent = null;  

    DownFileThread downFileThread;  //自定義文件下載線程  

    private Handler updateHandler = new  Handler(){  
        @Override  
        public void handleMessage(Message msg) {  
            switch(msg.what){  
                case DOWNLOAD_COMPLETE:  
                    //點擊安裝PendingIntent  
                     Uri uri = Uri.fromFile(downFileThread.getApkFile());  
                     Intent installIntent = new Intent(Intent.ACTION_VIEW);  
                     installIntent.setDataAndType(uri, "application/vnd.android.package-archive");                       
                     updatePendingIntent = PendingIntent.getActivity(DownloadServices.this, 0, installIntent, 0);  
                     myNotification.changeContentIntent(updatePendingIntent);  
                     myNotification.notification.defaults=Notification.DEFAULT_SOUND;//鈴聲提醒                      
                     myNotification.changeNotificationText("下載完成，請點擊安裝！");  

                    //停止服務  
                  //  myNotification.removeNotification();  
                    stopSelf();  
                    break;  
                case DOWNLOAD_FAIL:  
                    //下載失敗  
                    //                  myNotification.changeProgressStatus(DOWNLOAD_FAIL);    
                    myNotification.changeNotificationText("文件下載失敗！");  
                    stopSelf();  
                    break;  
                default:  //下載中  
                    Log.i("service", "default"+msg.what);  
        //          myNotification.changeNotificationText(msg.what+"%");  
            myNotification.changeProgressStatus(msg.what);    
            }  
        }  
    };  

    public DownloadServices() {  
        // TODO Auto-generated constructor stub  
    //  mcontext=context;  
        Log.i("service","DownloadServices1");  

    }  

    @Override  
    public void onCreate() {  
        // TODO Auto-generated method stub  
        Log.i("service","onCreate");  
        super.onCreate();  
    }  

    @Override  
    public void onDestroy() {  
        // TODO Auto-generated method stub  
        Log.i("service","onDestroy");  
        if(downFileThread!=null)  
        downFileThread.interuptThread();  
        stopSelf();  
        super.onDestroy();  
    }  

    @Override  
    public int onStartCommand(Intent intent, int flags, int startId) {  
        // TODO Auto-generated method stub  
        Log.i("service","onStartCommand");  

        updateIntent = new Intent(this, MainActivity.class);  
        PendingIntent   updatePendingIntent = PendingIntent.getActivity(this,0,updateIntent,0);  
        myNotification=new MyNotification(this, updatePendingIntent, 1);  

        //  myNotification.showDefaultNotification(R.drawable.ic_launcher, "測試", "開始下載");  
                myNotification.showCustomizeNotification(R.drawable.ic_launcher, "測試下載", R.layout.notification);  

        filePathString=Environment.getExternalStorageDirectory().getAbsolutePath() + "/family.apk";  

        //開啟一個新的線程下載，如果使用Service同步下載，會導致ANR問題，Service本身也會阻塞  
        downFileThread=new  DownFileThread(updateHandler,"http://10.103.241.247:8013/update/download",filePathString);  
        new Thread(downFileThread).start();  

        return super.onStartCommand(intent, flags, startId);  
    }  


    @Override  
    @Deprecated  
    public void onStart(Intent intent, int startId) {  
        // TODO Auto-generated method stub  
        Log.i("service","onStart");  
        super.onStart(intent, startId);  
    }  

    @Override  
    public IBinder onBind(Intent arg0) {  
        // TODO Auto-generated method stub  
        Log.i("service","onBind");  
        return null;  
    }  

}

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