Question

我尝试了一些方法，但没有成功，请帮助我。

Answer 1

PackageManager pm = context.getPackageManager();
ApplicationInfo appInfo = pm.getApplicationInfo("app.package.name", 0);
String appFile = appInfo.sourceDir;
long installed = new File(appFile).lastModified(); //Epoch Time

Answer 2

在API级别9（Gingerbread）及以上版本中，有PackageInfo.firstInstallTime字段，自纪元以来持有毫秒数：

packageManager.getPackageInfo(packageName, 0).firstInstallTime;

如果可用，我有以下代码使用它，并回退到apk修改时间：

// return install time from package manager, or apk file modification time,
// or null if not found
public Date getInstallTime(
    PackageManager packageManager, String packageName) {
  return firstNonNull(
    installTimeFromPackageManager(packageManager, packageName),
    apkUpdateTime(packageManager, packageName));
}

private Date apkUpdateTime(
    PackageManager packageManager, String packageName) {
  try {
    ApplicationInfo info = packageManager.getApplicationInfo(packageName, 0);
    File apkFile = new File(info.sourceDir);
    return apkFile.exists() ? new Date(apkFile.lastModified()) : null;
  } catch (NameNotFoundException e) {
    return null; // package not found
  }
}

private Date installTimeFromPackageManager(
    PackageManager packageManager, String packageName) {
  // API level 9 and above have the "firstInstallTime" field.
  // Check for it with reflection and return if present. 
  try {
    PackageInfo info = packageManager.getPackageInfo(packageName, 0);
    Field field = PackageInfo.class.getField("firstInstallTime");
    long timestamp = field.getLong(info);
    return new Date(timestamp);
  } catch (NameNotFoundException e) {        
    return null; // package not found
  } catch (IllegalAccessException e) {
  } catch (NoSuchFieldException e) {
  } catch (IllegalArgumentException e) {
  } catch (SecurityException e) {
  }
  // field wasn't found
  return null;
}

private Date firstNonNull(Date... dates) {
  for (Date date : dates)
    if (date != null)
      return date;
  return null;
}

Answer 3

PackageInfo.firstInstallTime为您提供“Unix time”的安装时间（自“epoch”以来的时间，以毫秒为单位，即 1月1日， 1970 00:00:00 UTC ）。您可以使用java.util.Date或java.text.DateFormat来格式化此时间。

private static final String TAG = "MyActivity";

...
packageName = ...
...

try {
    PackageInfo packageInfo = pm.getPackageInfo(packageName, PackageManager.GET_PERMISSIONS);

    Date installTime = new Date( packageInfo.firstInstallTime );
    Log.d(TAG, "Installed: " + installTime.toString());

    Date updateTime = new Date( packageInfo.lastUpdateTime );
    Log.d(TAG, "Updated: " + updateTime.toString());
}
catch ( PackageManager.NameNotFoundException e ) {
    e.printStackTrace();
}

您还可以使用java.text.SimpleDateFormat更改日期格式。

SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

String installTime = dateFormat.format( new Date( packageInfo.firstInstallTime ) );
Log.d(TAG, "Installed: " + installTime);

String updateTime = dateFormat.format( new Date( packageInfo.lastUpdateTime ) );
Log.d(TAG, "Updated: " + updateTime);

如何从Android获取应用安装时间

3 个答案: