未安装apk文件信息获取

一、获取APK图标

通常读取APK的图标可以用，PackageManager里面的getApplicationIcon(ApplicationInfo)来得到一个drawable。但实际使用的时候经常只能得到一个默认的图标，根本不是APK的图标。

参考小米开源文件管理器，结合实践，代码如下：

/*
   * 采用了新的办法获取APK图标，之前的失败是因为android中存在的一个BUG,通过
   * appInfo.publicSourceDir = apkPath;来修正这个问题，详情参见:
   * http://code.google.com/p/android/issues/detail?id=9151
   */
  public static Drawable getApkIcon(Context context, String apkPath) {
    PackageManager pm = context.getPackageManager();
    PackageInfo info = pm.getPackageArchiveInfo(apkPath,
        PackageManager.GET_ACTIVITIES);
    if (info != null) {
      ApplicationInfo appInfo = info.applicationInfo;
      appInfo.sourceDir = apkPath;
      appInfo.publicSourceDir = apkPath;
      try {
        return appInfo.loadIcon(pm);
      } catch (OutOfMemoryError e) {
        Log.e("ApkIconLoader", e.toString());
      }
    }
    return null;
  }

以下代码段中PackageManager、PackageInfo、ApplicationInfo均同上面一致。

二、获取APK名称

String label = appInfo.loadLabel(mPackManager).toString();

三、获取APK包名

String packageName = appInfo.packageName;

四、获取APK版本

String version = info.versionName==null?"0":info.versionName

五、判断APK是否安装

private boolean isApkInstalled(String packagename)
    {
      PackageManager localPackageManager = getPackageManager();
      try
      {
        PackageInfo localPackageInfo = localPackageManager.getPackageInfo(packagename, PackageManager.GET_UNINSTALLED_PACKAGES);
        return true;
      }
      catch (PackageManager.NameNotFoundException localNameNotFoundException)
      {
       return false;
      }
      
    }

六、安装APK

private void installAPK(String apkPath)
   {
     Intent intent = new Intent();
     intent.setAction(Intent.ACTION_VIEW);
     intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
     intent.setDataAndType(Uri.parse("file://" + apkPath),
          "application/vnd.android.package-archive");
     mContext.startActivity(intent);
   }

七、打开APK

</pre><pre name="code" class="java"> private void openAPK(String packagename)
   {
       PackageManager packageManager = mContext.getPackageManager(); 
       Intent intent=new Intent(); 
       intent =packageManager.getLaunchIntentForPackage(packagename); 
       mContext.startActivity(intent);
   }