xamarin android 检测并下载更新功能
//这里采用了asyncTask 异步任务public class DownLoadTask : AsyncTask<System.String, Integer, System.Boolean>{private string url = "";private string mSavePath = "";privat...
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//这里采用了asyncTask 异步任务
public class DownLoadTask : AsyncTask<System.String, Integer, System.Boolean>
{
private string url = "";
private string mSavePath = "";
private string fileName;
private string versionName;
private string ext;//文件后缀
private int progress = 0;
/// 需下载字节数
private long MaxLength = 0;
/// 当前已下载字节数
private long CurrentLength = 0;
private decimal Percent;
public int updateTotalSize;
private HttpMethod httpMethod;
//下载完成后的处理事件
public event Action<bool, string> Done;
/// <summary>
/// 进度更新的时候触发
/// </summary>
public event Action<int, decimal, long, long> OnUpdateProgress;
/// <summary>
/// 下载
/// </summary>
/// <param name="fileName"></param>
/// <param name="versionName"></param>
/// <param name="ext">文件后缀名</param>
/// <param name="url">下载路径</param>
public DownLoadTask(string fileName, string versionName, string ext, string url)
{
if (!IsCancelled)
{
this.httpMethod = HttpMethod.Get;
this.fileName = fileName;
this.versionName = versionName;
this.ext = ext;
this.url = url;
}
}
public DownLoadTask(IntPtr a, JniHandleOwnership b) : base(a, b)
{
}
protected override Java.Lang.Object DoInBackground(params Java.Lang.Object[] @params)
{
if (!IsCancelled)
{
return base.DoInBackground(@params);
}
else
{
return null;
}
}
protected override bool RunInBackground(params string[] @params)
{
bool result = false;
if (IsCancelled) { }
else
{
try
{
// 如果相等的话表示当前的sdcard挂载在手机上并且是可用的
if (Environment.ExternalStorageState.Equals(Environment.MediaMounted))
{
//下载apk服务器的地址
URL loadurl = new URL(url);
//保存apk地址
var saveFolder = Environment.ExternalStorageDirectory + "/Download/";
if (!System.IO.Directory.Exists(saveFolder)) System.IO.Directory.CreateDirectory(saveFolder);
//先删除之前已下载过的apk
FileHelper.ReadAndDeleteApk(saveFolder, versionName, ext);
mSavePath = string.Format("{0}/{1}.V{2}{3}", saveFolder, fileName, versionName, ext);// fileName + "appName" + versionName + ext;
// 创建连接
HttpURLConnection conn = (HttpURLConnection)loadurl.OpenConnection();
conn.Connect();
updateTotalSize = conn.ContentLength;
this.MaxLength = updateTotalSize;
int totalSize = 0;
//输入流
var inputstream = conn.InputStream;
//缓存
int bufferLength = 1024;
byte[] buf = new byte[bufferLength];
using (var fs = new FileStream(mSavePath, FileMode.Create))
{
int readsize = 0;
while (!IsCancelled && ((readsize = inputstream.Read(buf, 0, bufferLength)) != 0))
{
//写入文件
fs.Write(buf, 0, readsize);
totalSize += readsize;
this.CurrentLength = totalSize;
//计算进度条位置
var percend = (decimal)totalSize / (decimal)updateTotalSize;
this.Percent = percend;
progress = (int)(percend * 100);
Log.Debug("Download", "{0}/{1} {2:P4}", totalSize, updateTotalSize, percend);
PublishProgress(progress);
}
}
//写入到文件中
result = true;
inputstream.Close();
//TODO:校验文件完整性
//var fileLength = FileHelper.GetFileLength(mSavePath);
//if (fileLength != MaxLength)
//{
//}
}
}
catch (System.Exception ex)
{
Log.Debug("load", ex.Message);
}
}
return result;
}
protected override void OnPostExecute(System.Boolean aBoolean)
{
Done?.Invoke(aBoolean, mSavePath);
Log.Debug("load", "下载的状态:" + aBoolean);
}
protected override void OnProgressUpdate(params Integer[] values)
{
base.OnProgressUpdate(values);
if (values != null && values.Length > 0)
{
int val = (int)values[0];
// UpdateProgress?.Invoke(val);
OnUpdateProgress?.Invoke(val, this.Percent, this.CurrentLength, this.MaxLength);
}
}
}//activity调用
public class SystemInfoActivity : Activity
{
private Context context;
private bool isHasNew = false;
private RelativeLayout checkNewBtn;//检查更新
private CustomProgressDialog barDialog;
private AlertDialog.Builder builder;
protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
SetContentView(Resource.Layo ut.SystemInfo);
//。。。。。获取页面布局元素
context = this;
checkNewBtn = FindViewById<RelativeLayout>(Resource.Id.checkNewBtn);
checkNewBtn.Click -= CheckNewBtn_Click;
checkNewBtn.Click += CheckNewBtn_Click;
//先查询服务器上面最新的app版本
CheckNew();
}
//请求api，检测最新版本的信息
private void CheckNew()
{
//请求接口的代码省略。。。。
//返回的结果
if (result.Content.AppVersion > AppInfo.VersionCode)
{
isHasNew = true;
}
}
private void CheckNewBtn_Click(object sender, EventArgs e)
{
if (isHasNew)
{
OpenUpDialog();
}
else
{
MyDialog.showMessage(context, "当前已是最新版本无需更新");
}
}
//
private void OpenUpDialog()
{
builder = new AlertDialog.Builder(mContext);
builder.SetTitle("有新版本啦").SetMessage("我更新再更新").SetNeutralButton("暂不更新",
(s,e)=> { }).setPositiveButton("立即更新",(s,e)=>{
//先检测一遍是否有访问权限
if (CheckFilePermission())
{
DownloadApk(content.AppVersionCode, content.DownloadURL);
}
else
{
MyDialog.showMessage(context, "需要获得访问存储卡的权限，您可以在设置->应用->权限
进行设置!");
}
}).Show();
}
//查看是否打开了使用存储的读写权限
private bool CheckFilePermission()
{
var result = false;
// 需要在Android里面找到你要开的权限
string readPermission = Manifest.Permission.ReadExternalStorage;
string writerPermission = Manifest.Permission.WriteExternalStorage;
if (PermissionChecker.CheckSelfPermission(context, readPermission) ==
PermissionChecker.PermissionGranted &&
PermissionChecker.CheckSelfPermission(context, writerPermission) ==
PermissionChecker.PermissionGranted)
{
result = true;
}
return result;
}
//下载
private void DownloadApk(string versionName, string url)
{
//自定义的进度条弹窗
barDialog = new CustomProgressDialog(context);
barDialog.show(0, "0 / 0");
DownLoadTask loadtask = new DownLoadTask("appName", versionName, ".apk", url);
loadtask.Execute();
loadtask.OnUpdateProgress += Loadtask_OnUpdateProgress;
loadtask.Done += Loadtask_Done;
}
//更新进度条的值
private void Loadtask_OnUpdateProgress(int progress, decimal percent, long currentLength, long maxLength)
{
var stringCurrentLen = StringHelper.ToByteString(currentLength);
var stringmaxLen = StringHelper.ToByteString(maxLength);
barDialog.update(progress, stringCurrentLen + " / " + stringmaxLen);
}
//下载完成的时候
private void Loadtask_Done(bool isLoaded, string savePath)
{
barDialog.dismiss();
if (isLoaded)
{
InstallApk(savePath);
}
else
{
MyDialog.showToast(context, "下载失败", 1);
}
}
//开始安装
private void InstallApk(string savePath)
{
if (System.IO.File.Exists(savePath))
{
try
{
Intent i = new Intent(Intent.ActionView);
i.SetDataAndType(Uri.FromFile(new File(savePath)), "application/vnd.android.package-archive");
i.SetFlags(ActivityFlags.NewTask);
tartActivity(i);
}
catch (Exception)
{
MyDialog.showToast(context, "安装失败", 1);
}
}
else
{
MyDialog.showToast(context, "未找到安装包的文件路径", 1);
}
}
}//自定义进度条弹窗布局
<?xml version="1.0" encoding="utf-8"?>
<!--更新新版版本下载时的进度条-->
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:background="@color/white"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="@+id/title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:layout_marginBottom="20dp"
android:paddingLeft="15dp"
android:text="正在下载" />
<ProgressBar
android:id="@+id/progressBar"
style="?android:progressBarStyleHorizontal"
android:layout_width="match_parent"
android:layout_height="20dp"
android:minHeight="20dp"
android:paddingLeft="10dp"
android:paddingRight="10dp"
android:progress="0" />
<TextView
android:id="@+id/message"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:paddingLeft="15dp"
android:text="zz" />
</LinearLayout>
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