如何查找我的Android设备上是否存在特定的软件包？

Question

如何查找com.android.abc我的Android设备上是否存在特定的程序包或应用程序，例如：？

Answer 1

使用程序包名称调用以下任何方法。

import android.content.pm.PackageManager;

// ...

    public boolean isPackageExisted(String targetPackage){

        List<ApplicationInfo> packages;

        PackageManager pm;

        pm = getPackageManager();        

        packages = pm.getInstalledApplications(0);

        for (ApplicationInfo packageInfo : packages) {

            if(packageInfo.packageName.equals(targetPackage))

                return true;

        }

        return false;

    }

 import android.content.pm.PackageManager;

 public boolean isPackageExisted(String targetPackage){

   PackageManager pm=getPackageManager();

   try {

     PackageInfo info=pm.getPackageInfo(targetPackage,PackageManager.GET_META_DATA);

   } catch (PackageManager.NameNotFoundException e) {

     return false;

   }  

   return true;

 }

Answer 2

无需使用try-catch块或遍历一堆程序包：

public static boolean isPackageInstalled(Context context, String packageName) {

    final PackageManager packageManager = context.getPackageManager();

    Intent intent = packageManager.getLaunchIntentForPackage(packageName);

    if (intent == null) {

        return false;

    }

    List<ResolveInfo> list = packageManager.queryIntentActivities(intent, PackageManager.MATCH_DEFAULT_ONLY);

    return list.size() > 0;

}