Androidは他のアプリケーションのコードを起動します

private void startAppByPackageName(String packageName){
		PackageInfo pi = null;
		try {
			pi = getPackageManager().getPackageInfo(packageName, 0);
		} catch (NameNotFoundException e) {
			e.printStackTrace();
		}
		 
		Intent resolveIntent = new Intent(Intent.ACTION_MAIN, null);
		resolveIntent.addCategory(Intent.CATEGORY_LAUNCHER);
		resolveIntent.setPackage(pi.packageName);
		 
		List<ResolveInfo> apps = getPackageManager().queryIntentActivities(resolveIntent, 0);
		 
		ResolveInfo ri = apps.iterator().next();
		if (ri != null ) {
			String packageName1 = ri.activityInfo.packageName;
			String className = ri.activityInfo.name;
			 
			Intent intent = new Intent(Intent.ACTION_MAIN);
			intent.addCategory(Intent.CATEGORY_LAUNCHER);
			 
			ComponentName cn = new ComponentName(packageName1, className);
			 
			intent.setComponent(cn);
			startActivity(intent);
		}
		
	}