現在一般的android軟件都是需要不斷更新的，當你打開某個app的時候，如果有新的版本，它會提示你有新版本需要更新。該小程序實現的就是這個功能。
該小程序的特點是，當有更新時，會彈出一個提示框，點擊確定，則在通知來創建一個進度條進行下載，點擊取消，則取消更新。
以下是詳細代碼:
1.創建布局文件notification_item.xml，用于在通知欄生成一個進度條和下載圖標。
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:padding="3dp" > <ImageView android:id="@+id/notificationImage" android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@android:drawable/stat_sys_download" /> <TextView android:id="@+id/notificationTitle" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentRight="true" android:layout_toRightOf="@id/notificationImage" android:paddingLeft="6dp" android:textColor="#FF000000" /> <TextView android:id="@+id/notificationPercent" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/notificationImage" android:paddingTop="2dp" android:textColor="#FF000000" /> <ProgressBar android:id="@+id/notificationProgress" style="@style/ProgressBarHorizontal_color" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignLeft="@id/notificationTitle" android:layout_alignParentRight="true" android:layout_alignTop="@id/notificationPercent" android:layout_below="@id/notificationTitle" android:paddingLeft="6dp" android:paddingRight="3dp" android:paddingTop="2dp" /> </RelativeLayout>
2.創建AppContext類，該類繼承自Application。
package com.test.application; import android.app.Application; import android.content.Context; import com.test.update.config.Config; public class AppContext extends Application { private static AppContext appInstance; private Context context; public static AppContext getInstance() { return appInstance; } @Override public void onCreate() { // TODO Auto-generated method stub super.onCreate(); appInstance = this; context = this.getBaseContext(); // // 獲取當前版本號 // try { // PackageInfo packageInfo = getApplicationContext() // .getPackageManager().getPackageInfo(getPackageName(), 0); // Config.localVersion = packageInfo.versionCode; // Config.serverVersion = 1;// 假定服務器版本為2，本地版本默認是1 // } catch (NameNotFoundException e) { // e.printStackTrace(); // } initGlobal(); } public void initGlobal() { try { Config.localVersion = getPackageManager().getPackageInfo( getPackageName(), 0).versionCode; // 設置本地版本號 Config.serverVersion = 2;// 假定服務器版本為2，本地版本默認是1--實際開發中是從服務器獲取最新版本號，android具體與后端的交互見我另///外的博文 } catch (Exception ex) { ex.printStackTrace(); } } } 3.創建配置文件類Config.java,在這個類里面定義一些與版本相關的常量
package com.test.update.config; public class Config { //版本信息 public static int localVersion = 0; public static int serverVersion = 0; /* 下載包安裝路徑 */ public static final String savePath = "/sdcard/test/"; public static final String saveFileName = savePath + "test.apk"; } 4.編寫更新服務類UpdateServcie.java
package com.test.update; import java.io.File; import java.io.FileOutputStream; import java.io.InputStream; import java.net.HttpURLConnection; import java.net.URL; import android.annotation.SuppressLint; import android.app.Notification; import android.app.NotificationManager; import android.app.PendingIntent; import android.app.Service; 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.widget.RemoteViews; import com.test.update.config.Config; public class UpdateService extends Service { // 標題 private int titleId = 0; // 文件存儲 private File updateDir = null; private File updateFile = null; // 下載狀態 private final static int DOWNLOAD_COMPLETE = 0; private final static int DOWNLOAD_FAIL = 1; // 通知欄 private NotificationManager updateNotificationManager = null; private Notification updateNotification = null; // 通知欄跳轉Intent private Intent updateIntent = null; private PendingIntent updatePendingIntent = null; /*** * 創建通知欄 */ RemoteViews contentView; // 這樣的下載代碼很多，我就不做過多的說明 int downloadCount = 0; int currentSize = 0; long totalSize = 0; int updateTotalSize = 0; // 在onStartCommand()方法中準備相關的下載工作： @SuppressWarnings("deprecation") @Override public int onStartCommand(Intent intent, int flags, int startId) { // 獲取傳值 titleId = intent.getIntExtra("titleId", 0); // 創建文件 if (android.os.Environment.MEDIA_MOUNTED.equals(android.os.Environment .getExternalStorageState())) { updateDir = new File(Environment.getExternalStorageDirectory(), Config.saveFileName); updateFile = new File(updateDir.getPath(), getResources() .getString(titleId) + ".apk"); } this.updateNotificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE); this.updateNotification = new Notification(); // 設置下載過程中，點擊通知欄，回到主界面 updateIntent = new Intent(this, UpdateActivity.class); updatePendingIntent = PendingIntent.getActivity(this, 0, updateIntent, 0); // 設置通知欄顯示內容 updateNotification.icon = R.drawable.ic_launcher; updateNotification.tickerText = "開始下載"; updateNotification.setLatestEventInfo(this, "QQ", "0%", updatePendingIntent); // 發出通知 updateNotificationManager.notify(0, updateNotification); // 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 new Thread(new updateRunnable()).start();// 這個是下載的重點，是下載的過程 return super.onStartCommand(intent, flags, startId); } @Override public IBinder onBind(Intent arg0) { // TODO Auto-generated method stub return null; } @SuppressLint("HandlerLeak") 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(updateFile); Intent installIntent = new Intent(Intent.ACTION_VIEW); installIntent.setDataAndType(uri, "application/vnd.android.package-archive"); updatePendingIntent = PendingIntent.getActivity( UpdateService.this, 0, installIntent, 0); updateNotification.defaults = Notification.DEFAULT_SOUND;// 鈴聲提醒 updateNotification.setLatestEventInfo(UpdateService.this, "QQ", "下載完成,點擊安裝。", updatePendingIntent); updateNotificationManager.notify(0, updateNotification); // 停止服務 stopService(updateIntent); case DOWNLOAD_FAIL: // 下載失敗 updateNotification.setLatestEventInfo(UpdateService.this, "QQ", "下載完成,點擊安裝。", updatePendingIntent); updateNotificationManager.notify(0, updateNotification); default: stopService(updateIntent); } } }; public long downloadUpdateFile(String downloadUrl, File saveFile) throws Exception { HttpURLConnection httpConnection = null; InputStream is = null; FileOutputStream fos = null; try { URL url = new URL(downloadUrl); httpConnection = (HttpURLConnection) url.openConnection(); httpConnection .setRequestProperty("User-Agent", "PacificHttpClient"); if (currentSize > 0) { httpConnection.setRequestProperty("RANGE", "bytes=" + currentSize + "-"); } httpConnection.setConnectTimeout(10000); httpConnection.setReadTimeout(20000); updateTotalSize = httpConnection.getContentLength(); if (httpConnection.getResponseCode() == 404) { throw new Exception("fail!"); } is = httpConnection.getInputStream(); fos = new FileOutputStream(saveFile, false); byte buffer[] = new byte[4096]; int readsize = 0; while ((readsize = is.read(buffer)) > 0) { fos.write(buffer, 0, readsize); totalSize += readsize; // 為了防止頻繁的通知導致應用吃緊，百分比增加10才通知一次 if ((downloadCount == 0) || (int) (totalSize * 100 / updateTotalSize) - 10 > downloadCount) { downloadCount += 10; updateNotification.setLatestEventInfo(UpdateService.this, "正在下載", (int) totalSize * 100 / updateTotalSize + "%", updatePendingIntent); /*** * 在這里我們用自定的view來顯示Notification */ updateNotification.contentView = new RemoteViews( getPackageName(), R.layout.notification_item); updateNotification.contentView.setTextViewText( R.id.notificationTitle, "正在下載"); updateNotification.contentView.setProgressBar( R.id.notificationProgress, 100, downloadCount, false); updateNotificationManager.notify(0, updateNotification); } } } finally { if (httpConnection != null) { httpConnection.disconnect(); } if (is != null) { is.close(); } if (fos != null) { fos.close(); } } return totalSize; } class updateRunnable implements Runnable { Message message = updateHandler.obtainMessage(); public void run() { message.what = DOWNLOAD_COMPLETE; try { // 增加權限<USES-PERMISSION // android:name="android.permission.WRITE_EXTERNAL_STORAGE">; if (!updateDir.exists()) { updateDir.mkdirs(); } if (!updateFile.exists()) { updateFile.createNewFile(); } // 下載函數，以QQ為例子 // 增加權限<USES-PERMISSION // android:name="android.permission.INTERNET">; long downloadSize = downloadUpdateFile( "http://softfile.3g.qq.com:8080/msoft/179/1105/10753/MobileQQ1.0(Android)_Build0198.apk", updateFile); if (downloadSize > 0) { // 下載成功 updateHandler.sendMessage(message); } } catch (Exception ex) { ex.printStackTrace(); message.what = DOWNLOAD_FAIL; // 下載失敗 updateHandler.sendMessage(message); } } } } 5.編寫活動類UpdateActivity
package com.test.update; import com.test.update.config.Config; import android.support.v4.app.Fragment; import android.app.Activity; import android.app.AlertDialog; import android.content.DialogInterface; import android.content.Intent; import android.os.Bundle; import android.util.Log; import android.view.LayoutInflater; public class UpdateActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); checkVersion(); } /** * 檢查更新版本 */ public void checkVersion() { if (Config.localVersion < Config.serverVersion) { Log.i("hgncxzy", "=============================="); // 發現新版本，提示用戶更新 AlertDialog.Builder alert = new AlertDialog.Builder(this); alert.setTitle("軟件升級") .setMessage("發現新版本,建議立即更新使用.") .setPositiveButton("更新", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { // 開啟更新服務UpdateService // 這里為了把update更好模塊化，可以傳一些updateService依賴的值 // 如布局ID，資源ID，動態獲取的標題,這里以app_name為例 Intent updateIntent = new Intent( UpdateActivity.this, UpdateService.class); updateIntent.putExtra("titleId", R.string.app_name); startService(updateIntent); } }) .setNegativeButton("取消", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { dialog.dismiss(); } }); alert.create().show(); } else { // 清理工作，略去 // cheanUpdateFile() } } } 6.添加權限以及將服務靜態加載(在配置文件中加載)。
<uses-permission android:name="android.permission.INTERNET" /> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />
注冊服務
<service android:name="com.test.update.UpdateService" > </service>
完整的AndroidManifest.xml文件如下:
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.test.update" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="8" android:targetSdkVersion="8" /> <application android:name="com.test.application.AppContext" android:icon="@drawable/ic_launcher" android:label="@string/app_name" > <activity android:name="com.test.update.UpdateActivity" android:label="@string/app_name" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <service android:name="com.test.update.UpdateService" > </service> </application> <uses-permission android:name="android.permission.INTERNET" /> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" /> </manifest>
到此編碼結束。
源碼下載：Android實現APP自動更新功能
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持VEVB武林網。
新聞熱點
疑難解答
