权限

<uses-permissionandroid:name="android.permission.QUERY_ALL_PACKAGES"tools:ignore="QueryAllPackagesPermission" />

加上权限才能获取到所有的应用

获取代码

public static boolean hasApplication(Context context, String packageName) {PackageManager packageManager = context.getPackageManager();if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.M) {Intent intent = new Intent(Intent.ACTION_MAIN).addCategory(Intent.CATEGORY_LAUNCHER);List<ResolveInfo> list = packageManager.queryIntentActivities(intent, PackageManager.MATCH_ALL);for (int i = 0,count=list.size(); i <count ; i++) {if(list.get(i).activityInfo.applicationInfo.packageName.equalsIgnoreCase(packageName)) {return true;}}}else{//packageManager.queryIntentActivities(intent,0)//获取系统中安装的应用包的信息List<PackageInfo> listPackageInfo = packageManager.getInstalledPackages(0);for (int i = 0; i < listPackageInfo.size(); i++) {if (listPackageInfo.get(i).packageName.equalsIgnoreCase(packageName)) {return true;}}}return false;}

低版本的手机 可以用else里边的方法 也可以用

Intent intent = new Intent(Intent.ACTION_MAIN).addCategory(Intent.CATEGORY_LAUNCHER);
packageManager.queryIntentActivities(intent,0)

Intent的action 是：Intent.ACTION_MAIN 这个不要传错。

通过包名获取对应应用的启动页的全类名

/*** 获取APP的启动类* @param context* @param packageName* @return*/String getAppStartClass(Context context, String packageName) {PackageManager packageManager = context.getPackageManager();try {Intent intent = new Intent(Intent.ACTION_MAIN).addCategory(Intent.CATEGORY_LAUNCHER);List<ResolveInfo> list = packageManager.queryIntentActivities(intent, PackageManager.GET_ACTIVITIES);for (int i = 0,count=list.size(); i <count ; i++) {if (TextUtils.equals(list.get(i).activityInfo.packageName, packageName)) {return list.get(i).activityInfo.name;}}} catch (Exception e) {e.printStackTrace();} finally {return "";}}

水平有限，如有问题欢迎评论区留言指正。

如果在高版本上有问题的话建议将targetSdkVersion设置成26试试。

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