Develop Reference

Android check if facebook is preinstalled or not?

I have added one code to check if Facebook installed or not, in normal cases it is working but when facebook comes by default on some devices it is not working, it says package not found. can anyone help me here?
public Boolean checkFbInstalled() {
PackageManager pm = getPackageManager();
boolean flag = false;
try {
pm.getPackageInfo("com.facebook.katana", PackageManager.GET_ACTIVITIES);
flag = true;
} catch (PackageManager.NameNotFoundException e) {
flag = false;
}
if (flag == false) {
try {
pm.getPackageInfo("com.facebook.lite", PackageManager.GET_ACTIVITIES);
flag = true;
} catch (PackageManager.NameNotFoundException e) {
flag = false;
}
}
if (flag == false) {
try {
pm.getPackageGids("com.facebook.katana");
flag = true;
} catch (PackageManager.NameNotFoundException e) {
flag = false;
}
}
return flag;
}

Check if the facebook package name exist with try-catch:
try{
ApplicationInfo info = getPackageManager().
getApplicationInfo("com.facebook.katana", 0 );
return true;
}catch( PackageManager.NameNotFoundException e ){
return false;
}
Note: If you like to see if the Facebook SDK exist and not the Facebook app you need to change the package name on the getApplicationInfo() method from com.facebook.katana to com.facebook.android

PackageManager check of isEphemeralDisabled causes a deadlock on Android 7.1

private boolean isEphemeralAllowed(
Intent intent, List<ResolveInfo> resolvedActivities, int userId,
boolean skipPackageCheck) {
// Short circuit and return early if possible.
if (isEphemeralDisabled()) {
return false;
}
final int callingUser = UserHandle.getCallingUserId();
if (callingUser != UserHandle.USER_SYSTEM) {
return false;
}
if (mEphemeralResolverConnection == null) {
return false;
}
if (intent.getComponent() != null) {
return false;
}
if ((intent.getFlags() & Intent.FLAG_IGNORE_EPHEMERAL) != 0) {
return false;
}
if (!skipPackageCheck && intent.getPackage() != null) {
return false;
}
final boolean isWebUri = hasWebURI(intent);
private boolean isEphemeralDisabled() {
// ephemeral apps have been disabled across the board
if (DISABLE_EPHEMERAL_APPS) {
return true;
}
// system isn't up yet; can't read settings, so, assume no ephemeral apps
if (!mSystemReady) {
return true;
}
// we can't get a content resolver until the system is ready; these checks must happen last
final ContentResolver resolver = mContext.getContentResolver();
if (Global.getInt(resolver, Global.ENABLE_EPHEMERAL_FEATURE, 1) == 0) {
return true;
}
return Secure.getInt(resolver, Secure.WEB_ACTION_ENABLED, 1) == 0;
}
For Android 7.0, DISABLE_EPHEMERAL_APPS default is true
private static final boolean DISABLE_EPHEMERAL_APPS = true;
But in Android 7.1, Google enabled Instant apps support: https://android.googlesource.com/platform/frameworks/base.git/+/7ef97b6624054fff0d712d85336a45eee70bcc3f%5E%21/#F0
for isEphemeralAllowed method, if call resolveIntent, most of intents will call isEphemeralAllowed method, so this will cause PackageManager service user binder call settingProvider, and will probability cause a deadlock.

How to check permission SYSTEM_ALERT_WINDOW is granted on Android Lollipop?

Note that I'm talking about Android Lollipop. For android 6.0 we can use method canDrawOverlays() to check that SYSTEM_ALERT_WINDOW is granted or not.
With Android Lollipop, almost devices grant this permission by default. But on some devices of Xiaomi, Meizu.. it is not granted. Users need to go to the App info to allow it.
How can we check it programmatically to warn users?

in MIUI use
public static boolean isMiuiFloatWindowOpAllowed(#NonNull Context context) {
final int version = Build.VERSION.SDK_INT;
if (version >= 19) {
return checkOp(context, OP_SYSTEM_ALERT_WINDOW); //See AppOpsManager.OP_SYSTEM_ALERT_WINDOW=24 /*#hide/
} else {
return (context.getApplicationInfo().flags & 1<<27) == 1;
}
}
public static boolean checkOp(Context context, int op, String packageName, int uid) {
final int version = Build.VERSION.SDK_INT;
if (version >= 19) {
AppOpsManager manager = (AppOpsManager) context.getSystemService(Context.APP_OPS_SERVICE);
try {
return (AppOpsManager.MODE_ALLOWED == (Integer) ReflectUtils.invokeMethod(manager, "checkOp", op, uid, packageName));
} catch (Exception e) {
e.printStackTrace();
}
} else {
Flog.e("Below API 19 cannot invoke!");
}
return false;
}
ReflectUtils.java
public static Object invokeMethod(#NonNull Object receiver, String methodName, Object... methodArgs) throws Exception {
Class<?>[] argsClass = null;
if (methodArgs != null && methodArgs.length != 0) {
int length = methodArgs.length;
argsClass = new Class[length];
for (int i=0; i<length; i++) {
argsClass[i] = getBaseTypeClass(methodArgs[i].getClass());
}
}
Method method = receiver.getClass().getMethod(methodName, argsClass);
return method.invoke(receiver, methodArgs);
}

Reflection is risky because you take things for granted...and things can change in future versions of Android. The following method only uses reflection if the proper way fails.
#SuppressLint("NewApi")
public static boolean canDrawOverlayViews(Context con){
if(Build.VERSION.SDK_INT< Build.VERSION_CODES.LOLLIPOP)
return true;
try {
return Settings.canDrawOverlays(con);
}
catch(NoSuchMethodError e){
return canDrawOverlaysUsingReflection(con);
}
}
public static boolean canDrawOverlaysUsingReflection(Context context) {
try {
AppOpsManager manager = (AppOpsManager) context.getSystemService(Context.APP_OPS_SERVICE);
Class clazz = AppOpsManager.class;
Method dispatchMethod = clazz.getMethod("checkOp", new Class[] { int.class, int.class, String.class });
//AppOpsManager.OP_SYSTEM_ALERT_WINDOW = 24
int mode = (Integer) dispatchMethod.invoke(manager, new Object[] { 24, Binder.getCallingUid(), context.getApplicationContext().getPackageName() });
return AppOpsManager.MODE_ALLOWED == mode;
} catch (Exception e) { return false; }
}

how to find a rooted device?

I was been trying to find whether a device is rooted or not and if the device is found rooted i do not want my application to get installed.I have tried two of the below methods
private boolean isRooted() {
return findBinary("su");
}
public static boolean findBinary(String binaryName) {
boolean found = false;
if (!found) {
String[] places = { "/sbin/", "/system/bin/", "/system/xbin/",
"/data/local/xbin/", "/data/local/bin/",
"/system/sd/xbin/", "/system/bin/failsafe/", "/data/local/" };
for (String where : places) {
if (new File(where + binaryName).exists()) {
found = true;
break;
}
}
try {
File file = new File("/system/app/Superuser.apk");
if (file.exists()) {
Log.e("ERROR", "Unable to find icon for package '"
+ "apk found");
found = true;
}
} catch (Exception e1) {
// ignore
}
}
return found;
}
But i don't think that these methods are enough to find a rooted device,since there are tools to hide an apk and the su file can be renamed or deleted.Is there any other way or any suggestions which is 100 percent reliable to find a rooted device?
I was trying to edit the su but couldn't do anything.Is it just a word of mouth or really possible to do so? Thanks in advance
***EDITED***:
I have used "HIDE MY ROOT" application to hide the SU binary aswell as superuser.apk.I can make my rooted device, look like unrooted using hide my root application.Therefore i can say that this source is falseproof and not completely reliable to find rooted device.
Kindly let me know if there is any alternative way to find the rooted device..

I did this in the following way :
/*
* Run su command on device
* #throws IOException, InterruptedException
*/
private static boolean suRun() throws IOException, InterruptedException
{
try {
Process su = null;
su = Runtime.getRuntime().exec(new String[] {"su","-c","exit"});
su.waitFor();
InputStream in = su.getInputStream();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(in));
String suOutput = bufferedReader.readLine();
if (suOutput == null)
{
return true;
}
else
{
return false;
}
} catch (Exception ex)
{
return false;
}
}
public static boolean isPhoneRooted() {
// check if /system/app/Superuser.apk is present and can run su
try {
File file = new File("/system/app/Superuser.apk");
if (file.exists() && suRun()) {
Log.d("Blocking Service", "ROOTED PHONE DETECTED");
return true;
}
}
catch (Throwable e1) {
// ignore
}
return false;
}

you can use SafetyNet API from google play service. this is what being used by android pay not only for the root detection but also to check compatibility with android CTS.

Call isRooted() from ShellInterface
isRooted() depend upon majority of three factor
public static boolean isRooted() {
return isRooted1() ? (isRooted2() || isRooted3()) : (isRooted2() && isRooted3());
}
private static boolean isRooted1() {
Process mProcess = null;
boolean mRoot;
try {
// This is executing on terminal
mProcess = Runtime.getRuntime().exec("su");
mRoot = true;
// If the execute successfully then it return to true
} catch (Exception e) {
// if is not successfully then it return to false
mRoot = false;
} finally {
if (mProcess != null) {
try {
mProcess.destroy();
} catch (Exception ignored) {
}
}
}
return mRoot;
}
private static boolean isRooted2() {
String buildTags = Build.TAGS;
return buildTags !=null && buildTags.contains("test-keys");
}
private static boolean isRooted3() {
boolean mRoot = false;
boolean found = false;
if (!found) {
String[] places = {"/sbin/", "/system/bin/","/system/xbin",
"/data/local/xbin","/system/sd/xbin","/data/local"
};
for (String path : places){
if (new File(path+"su").exists()) {
mRoot = true;
found = true;
}
}
}
return mRoot;
}

How can I find if a particular package exists on my Android device?

How can I find whether a particular package or application, say: com.android.abc, exists on my Android device?

Call any of the below method with the package name.
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;
}

Without using a try-catch block or iterating through a bunch of packages:
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;
}

Kotlin
fun isPackageExist(context: Context, target: String): Boolean {
return context.packageManager.getInstalledApplications(0).find { info -> info.packageName == target } != null
}
Edit: Extension Function
fun Context.isPackageExist(target: String): Boolean {
return packageManager.getInstalledApplications(0).find { info -> info.packageName == target } != null
}

Intent intent = new Intent("com.google.zxing.client.android.SCAN");
PackageManager packageManager = getPackageManager();
List<ResolveInfo> activities = packageManager.queryIntentActivities(intent, 0);
boolean isIntentSafe = activities.size() > 0;

We can check like this:
if(getPackageManager().hasSystemFeature("android.software.webview") == true && isPackageExisted("com.google.android.webview")) {
if (Constant.isNetworkConnected(Activity.this)) {
//Your Intent
} else {
Toast.makeText(getApplicationContext(), resources.getString(R.string.internet_error), Toast.LENGTH_SHORT).show();
}
} else
{
Constant.showDialog(Activity.this,"Please install the webview");
}
}
Make method for package check ! this credit goes to "Kavi" https://stackoverflow.com/a/30708227/6209105
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;
}

You should use PackageManager's function called getInstalledPackages() to get the list of all installed packages and the search for the one you are interested in. Note that package name is located in PackageInfo.packageName field.

Since some devices have reported that the "getInstalledPackages" can cause TransactionTooLargeException (check here, here and here), I think you should also have a fallback like I did below.
This issue was supposed to be fixed on Android 5.1 (read here), but some still reported about it.
public static List<String> getInstalledPackages(final Context context) {
List<String> result = new ArrayList<>();
final PackageManager pm = context.getPackageManager();
try {
List<PackageInfo> apps = pm.getInstalledPackages(0);
for (PackageInfo packageInfo : apps)
result.add(packageInfo.packageName);
return result;
} catch (Exception ignored) {
//we don't care why it didn't succeed. We'll do it using an alternative way instead
}
// use fallback:
BufferedReader bufferedReader = null;
try {
Process process = Runtime.getRuntime().exec("pm list packages");
bufferedReader = new BufferedReader(new InputStreamReader(process.getInputStream()));
String line;
while ((line = bufferedReader.readLine()) != null) {
final String packageName = line.substring(line.indexOf(':') + 1);
result.add(packageName);
}
closeQuietly(bufferedReader);
process.waitFor();
} catch (Exception e) {
e.printStackTrace();
} finally {
closeQuietly(bufferedReader);
}
return result;
}
public static void closeQuietly(final Closeable closeable) {
if (closeable == null)
return;
try {
closeable.close();
} catch (final IOException e) {
}
}

If you just want to use adb:
adb shell "pm list packages"|cut -f 2 -d ":"
it will list all installed packages.

You can use pm.getPackageUid() instead of iterating over the pm.getInstalledApplications()
boolean isPackageInstalled;
PackageManager pm = getPackageManager();
int flags = 0;
try
{
pm.getPackageUid(packageName,flags);
isPackageInstalled = true;
}
catch (final PackageManager.NameNotFoundException nnfe)
{
isPackageInstalled = false;
}
return isPackageInstalled;

According to the Package visibility filtering changes in Android 11, you need to add this permission to your manifest to be able to list installed apps:
<uses-permission android:name="android.permission.QUERY_ALL_PACKAGES"/>
but Google doesn't recommend to use this way. You should use <queries> tag instead:
<manifest ...>
<queries>
<package android:name="com.app.package" />
...
</queries>
...
</manifest>
And in your code:
fun isAppInstalled(context: Context, packageId: String): Boolean {
return try {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
context.packageManager
.getApplicationInfo(packageId, PackageManager.ApplicationInfoFlags.of(0))
} else {
context.packageManager.getApplicationInfo(packageId, 0)
}
true
} catch (e: PackageManager.NameNotFoundException) {
false
}
}