Android编程实现应用获取包名、版本号、权限等信息的方法

/**
* 获取当前应用程序的包名
* @param context 上下文对象
* @return 返回包名
*/
public static String getAppProcessName(Context context) {
    //当前应用pid
    int pid = android.os.Process.myPid();
    //任务管理类
    ActivityManager manager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
    //遍历所有应用
    List<ActivityManager.RunningAppProcessInfo> infos = manager.getRunningAppProcesses();
    for (ActivityManager.RunningAppProcessInfo info : infos) {
      if (info.pid == pid)//得到当前应用
        return info.processName;//返回包名
    }
    return "";
}
/**
* 获取程序 图标
* @param context
* @param packname 应用包名
* @return
*/
public Drawable getAppIcon(Context context,String packname){
   try {
     //包管理操作管理类
     PackageManager pm = context.getPackageManager();
     //获取到应用信息
       ApplicationInfo info = pm.getApplicationInfo(packname, 0);
       return info.loadIcon(pm);
    } catch (NameNotFoundException e) {
      e.printStackTrace();
    }
  return null;
}
/**
* 获取程序的版本号
* @param context
* @param packname
* @return
*/
public String getAppVersion(Context context,String packname){
     //包管理操作管理类
   PackageManager pm = context.getPackageManager();
     try {
       PackageInfo packinfo = pm.getPackageInfo(packname, 0);
       return packinfo.versionName;
      } catch (NameNotFoundException e) {
        e.printStackTrace();
      }
    return packname;
}
/**
* 获取程序的名字
* @param context
* @param packname
* @return
*/
public String getAppName(Context context,String packname){
 //包管理操作管理类
   PackageManager pm = context.getPackageManager();
     try {
         ApplicationInfo info = pm.getApplicationInfo(packname, 0);
         return info.loadLabel(pm).toString();
      } catch (NameNotFoundException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
      }
    return packname;
}
/*
* 获取程序的权限
*/
public String[] getAllPermissions(Context context,String packname){
     try {
       //包管理操作管理类
       PackageManager pm = context.getPackageManager();
       PackageInfo packinfo =  pm.getPackageInfo(packname, PackageManager.GET_PERMISSIONS);
       //获取到所有的权限
       return packinfo.requestedPermissions;
      } catch (NameNotFoundException e) {
        e.printStackTrace();
      }
    return null;
}
/**
* 获取程序的签名
* @param context
* @param packname
* @return
*/
public static String getAppSignature(Context context,String packname){
     try {
       //包管理操作管理类
       PackageManager pm = context.getPackageManager();
       PackageInfo packinfo = pm.getPackageInfo(packname, PackageManager.GET_SIGNATURES);
       //获取当前应用签名
       return packinfo.signatures[0].toCharsString();
      } catch (NameNotFoundException e) {
        e.printStackTrace();
      }
    return packname;
}
/**
* 获取当前展示 的Activity名称
* @return
*/
private static String getCurrentActivityName(Context context){
    ActivityManager activityManager=(ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
    String runningActivity=activityManager.getRunningTasks(1).get(0).topActivity.getClassName();
    return runningActivity;
}