友好的视觉感知和稳定的不出错表现,来自于我们追求美感和考虑的全面性,博客园从技术的角度,一直我都很欣赏。
这篇文章是android开发人员的必备知识,是我特别为大家整理和总结的,不求完美,但是有用。
这一篇是对上一篇《Android学习系列(2)--App自动更新之通知栏下载》的补充,因此只是以点为要,点到为止。
1.内部存储
出于考虑到用户可能禁掉了SDCard或者电脑暂时插在电脑上且为磁盘连接状态等等,对于这么个情况下,我们应该也要保证我们的程序也是能正常的运行。所以我们要考虑内部存储。
我暂时把内部存储定在/data/data/xxxxxappxxxx/files目录,核心代码如下:
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if (android.os.Environment.MEDIA_MOUNTED.equals(android.os.Environment.getExternalStorageState())){ |
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updateDir = new File(Environment.getExternalStorageDirectory(),Global.downloadDir); |
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updateDir = getFilesDir(); |
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updateFile = new File(updateDir.getPath(),getResources().getString(titleId)+ ".apk" ); |
2.内部存储的权限
一起都运行的正常,但是当我们帮下下来的apk文件执行运行操作的时候,确提示如下,
"解析包错误"??其实你下载的文件并不一定就是坏的或者错误的,也可能是android系统的权限在作怪。在你执行之前,加上如下核心代码:
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String cmd = "chmod +x " +updateFile.getPath(); |
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Runtime.getRuntime().exec(cmd); |
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} catch (IOException e) { |
3.通知栏显示进度条组件的一个bug。
在通知栏设置进度条的可见性,会无缘无故的崩溃。
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updateNotification.contentView.setViewVisibility(progressViewID, View.GONE); |
4.自定义进度条显示视图。
布局文件updata_nitification.xml:
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<? xml version = "1.0" encoding = "utf-8" ?> |
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android:layout_width = "fill_parent" |
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android:layout_height = "fill_parent" |
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android:orientation = "vertical" |
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android:layout_weight = "2" |
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android:paddingLeft = "5dip" > |
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< LinearLayout android:layout_width = "fill_parent" |
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android:layout_height = "fill_parent" |
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android:gravity = "left|center_vertical" |
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android:orientation = "horizontal" |
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android:layout_weight = "1" > |
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< ImageView android:src = "@drawable/icon" |
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android:layout_width = "24dip" |
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android:layout_height = "fill_parent" |
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android:scaleType = "fitCenter" /> |
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< TextView android:layout_width = "wrap_content" |
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android:layout_height = "wrap_content" |
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android:text = "@string/app_name" |
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android:textColor = "#000000" |
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android:paddingLeft = "5dip" |
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android:textSize = "16dip" /> |
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< LinearLayout android:layout_width = "fill_parent" |
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android:layout_height = "fill_parent" |
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android:gravity = "left" |
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android:orientation = "horizontal" |
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android:layout_weight = "1" > |
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< TextView android:id = "@+id/update_notification_progresstext" |
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android:layout_width = "wrap_content" |
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android:layout_height = "wrap_content" |
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android:textColor = "#8F8F8F" |
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android:textSize = "14dip" /> |
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< LinearLayout android:id = "@+id/update_notification_progressblock" |
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android:layout_width = "fill_parent" |
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android:layout_height = "wrap_content" |
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android:orientation = "horizontal" > |
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< ProgressBar android:id = "@+id/update_notification_progressbar" |
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android:layout_width = "fill_parent" |
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android:layout_height = "wrap_content" |
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style = "?android:attr/progressBarStyleHorizontal" /> |
开始下载:
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updateNotification.contentIntent = updatePendingIntent; |
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updateNotification.contentView.setProgressBar(com.cnblogs.tianxia.subway.R.id.update_notification_progressbar, 100 , 0 , false ); |
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updateNotification.contentView.setTextViewText(com.cnblogs.tianxia.subway.R.id.update_notification_progresstext, "0%" ); |
正在下载,显示下载进度条:
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updateNotification.contentView.setProgressBar(com.cnblogs.tianxia.subway.R.id.update_notification_progressbar, 100 , ( int )(totalSize* 100 /updateTotalSize), false ); |
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updateNotification.contentView.setTextViewText(com.cnblogs.tianxia.subway.R.id.update_notification_progresstext, ( int )(totalSize* 100 /updateTotalSize)+ "%" ); |
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updateNotificationManager.notify( 0 , updateNotification); |
下载完成,点击可以安装:
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Uri uri = Uri.fromFile(updateFile); |
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Intent installIntent = new Intent(Intent.ACTION_VIEW); |
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installIntent.setDataAndType(uri, "application/vnd.android.package-archive" ); |
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updatePendingIntent = PendingIntent.getActivity(UpdateService. this , 0 , installIntent, 0 ); |
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updateNotification.defaults = Notification.DEFAULT_SOUND; |
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updateNotification.contentIntent = updatePendingIntent; |
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updateNotification.contentView.setViewVisibility(com.cnblogs.tianxia.subway.R.id.update_notification_progressblock, View.GONE); |
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updateNotification.contentView.setTextViewText(com.cnblogs.tianxia.subway.R.id.update_notification_progresstext, "下载完成,点击安装!" ); |
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updateNotificationManager.notify( 0 , updateNotification); |
效果图如下: