Develop Reference

Android Mocking GPS Location avoid detection of ALLOW_MOCK_LOCATION as true by other app

Im making an apps that mock location and executing set ALLOW_MOCK_LOCATION turned on and off on runtime, so i hopes the other apps which detecting the ALLOW_MOCK_LOCATION flag will never get the ALLOW_MOCK_LOCATION as 1(true).
I read from here that it was possible and said to be fast enough, so other apps can hardly detect the change of ALLOW_MOCK_LOCATION. But what i am get is the other apps still sometimes reed ALLOW_MOCK_LOCATION as 1(true).
Please note that my devices already rooted and i can confirm it does mocked the location well. I also tried move it into /system/app, but still also encounter this problem.
This is the periodical loop which dispatch a asyntask with timeout(I even set the timeout 3 millis !!).
while(RUNNING){
fakeLocation.setAltitude(65.0);
fakeLocation.setAccuracy(Criteria.ACCURACY_FINE);
fakeLocation.setSpeed(0.0f);
fakeLocation.setTime(System.currentTimeMillis());
if(Build.VERSION.SDK_INT > Build.VERSION_CODES.JELLY_BEAN) {
fakeLocation.setElapsedRealtimeNanos(SystemClock.elapsedRealtimeNanos());
if(locationJellyBeanFixMethod!=null){
try {
locationJellyBeanFixMethod.invoke(fakeLocation);
}catch(Exception ex){}
}
}
new Thread(new Runnable() {
#Override
public void run() {
try {
new MockTask().execute().get(3, TimeUnit.MILLISECONDS);
}catch(TimeoutException e){
changeMockLocationSettings(0);
//Log.d(GLOBAL_VAR.TAG_DEBUG,"Mock location timeout:");
}catch(Exception e){}
}
}).start();
try {Thread.sleep(1500);} catch (InterruptedException e) {}
}
Below is the Asyntask
private class MockTask extends AsyncTask<Void, Void, Void> {
#Override
protected Void doInBackground(Void... param) {
try {
changeMockLocationSettings(1);
locationManager.setTestProviderLocation(GLOBAL_VAR.PROVIDER_NAME, fakeLocation);
changeMockLocationSettings(0);
//Log.d(GLOBAL_VAR.TAG_DEBUG,"location mocked -> "+fakeLocation);
} catch (Exception ex) {
//Log.d(GLOBAL_VAR.TAG_DEBUG,"Failed to mock location:"+ex.toString());
}
return null;
}
#Override
protected void onPostExecute(Void loc) {}
}
And lastly, the method to change ALLOW_MOCK_LOCATION
private boolean changeMockLocationSettings(int value) {
try {
return Settings.Secure.putInt(getApplicationContext().getContentResolver(),Settings.Secure.ALLOW_MOCK_LOCATION, value);
} catch (Exception e) {
Log.d(GLOBAL_VAR.TAG_DEBUG,"Setting allow mock location to "+value+" failed :"+e.toString());
e.printStackTrace();
return false;
}
}
Please help and correct me, and even suggest a better solution if any, and thanks in Advance

webview keeps playing after activity is paused

In my app I use webview to display webpages defined by user. IF webpage contains video the video doesn't stop after back is pressed and activity is stopped. I've solve this issue in older implementation (android.webkit.WebView) but now I'm facing this issue again in kitkat which uses webview from chromium package. Here is the code I'm using in older versions. I'm looking to do the same in >=4.4 android versions.
if(webView!=null){
try {
Class.forName("android.webkit.WebView")
.getMethod("onPause", (Class[]) null)
.invoke(webView, (Object[]) null);
} catch(ClassNotFoundException cnfe) {
} catch(NoSuchMethodException nsme) {
} catch(InvocationTargetException ite) {
} catch (IllegalAccessException iae) {
}
}

Hmmm... how about you try loading a bogus url, forcing the webview to dump the current webpage:
myWebView.loadUrl("about:blank");

you have to stop webview onpause
#Override
public void onPause() {
// TODO Auto-generated method stub
try {
webView.loadUrl("about:blank");
} catch (Exception e) {
}
super.onPause();
}

Try Catch method for open bluetooth function

I made a simple android appication for connect with bluetooth serial device and I want to add closeBT if android not connected maybe the device is out of range because crash.
How do I do this? This code is correct?
protected void onStart() {
super.onStart();
findBT(); //Check if bluettoth enable and paired devices
try {
openBT(); //open sockets,streams
} catch (IOException e) {
e.printStackTrace();
closeBT();
}
}

Try-catch is not for the application logic! It is for doing stuff when something went wrong! You want to use an if-else here, like
if (findBT() != null) { // I don't know what findBT does, but maybe it returns BT-devices
try {
openBT(); //open sockets,streams
} catch (IOException e) {
e.printStackTrace();
// inform the user that a connection could not be established or something similar
}
} else {
// inform the user, that no BT-device was found.
}
you want to use closeBT() for instance when the user or your application decides to disconnect the BT-devices.

how can i share my comments in googleplus by using addthis

i tried out its not working anyone can help me out
public void googlefunc(View v)
{
try {
AddThis.shareItem(this, "googleplus", mUrl, mShareTitle,
mShareDescription);
}
catch (ATDatabaseException e) {
e.printStackTrace();
}
catch (ATSharerException e) {
e.printStackTrace();
}
}

You have to use google_plusone (or google_plusone_share) instead of googleplus.
See the list of the available service (and search for google_plusone to find the right row).

How can I enable NFC reader via API?

There is any way I can enable Android NFC reader using API?

So apparently there is no way to enable the NFC from the API, even though Google does so within their source code (see below).
If you look at a line from the API for NfcAdapter.isEnabled():
Return true if this NFC Adapter has
any features enabled.
Application may use this as a helper
to suggest that the user should turn
on NFC in Settings.
If this method returns false, the NFC
hardware is guaranteed not to generate
or respond to any NFC transactions.
It looks like there is no way to do it within the API. Bummer. Your best bet is a dialog to inform the user they need to enable it in the settings, and perhaps launch a settings intent.
EDIT: The following is from the source, but it looks like they didn't allow the user to implement the methods in the API (I'm confused about this).
I found this from the android source code to help enable and disable the adapter.
Relevant source:
public boolean onPreferenceChange(Preference preference,
Object value) {
// Turn NFC on/off
final boolean desiredState = (Boolean) value;
mCheckbox.setEnabled(false);
// Start async update of the NFC adapter state, as the API is
// unfortunately blocking...
new Thread("toggleNFC") {
public void run() {
Log.d(TAG, "Setting NFC enabled state to: "
+ desiredState);
boolean success = false;
if (desiredState) {
success = mNfcAdapter.enable();
} else {
success = mNfcAdapter.disable();
}
if (success) {
Log.d(TAG,
"Successfully changed NFC enabled state to "
+ desiredState);
mHandler.post(new Runnable() {
public void run() {
handleNfcStateChanged(desiredState);
}
});
} else {
Log.w(TAG, "Error setting NFC enabled state to "
+ desiredState);
mHandler.post(new Runnable() {
public void run() {
mCheckbox.setEnabled(true);
mCheckbox
.setSummary(R.string.nfc_toggle_error);
}
});
}
}
}.start();
return false;
}

I got it working through reflection
This code works on API 15, haven't checked it against other verions yet
public boolean changeNfcEnabled(Context context, boolean enabled) {
// Turn NFC on/off
final boolean desiredState = enabled;
mNfcAdapter = NfcAdapter.getDefaultAdapter(context);
if (mNfcAdapter == null) {
// NFC is not supported
return false;
}
new Thread("toggleNFC") {
public void run() {
Log.d(TAG, "Setting NFC enabled state to: " + desiredState);
boolean success = false;
Class<?> NfcManagerClass;
Method setNfcEnabled, setNfcDisabled;
boolean Nfc;
if (desiredState) {
try {
NfcManagerClass = Class.forName(mNfcAdapter.getClass().getName());
setNfcEnabled = NfcManagerClass.getDeclaredMethod("enable");
setNfcEnabled.setAccessible(true);
Nfc = (Boolean) setNfcEnabled.invoke(mNfcAdapter);
success = Nfc;
} catch (ClassNotFoundException e) {
} catch (NoSuchMethodException e) {
} catch (IllegalArgumentException e) {
} catch (IllegalAccessException e) {
} catch (InvocationTargetException e) {
}
} else {
try {
NfcManagerClass = Class.forName(mNfcAdapter.getClass().getName());
setNfcDisabled = NfcManagerClass.getDeclaredMethod("disable");
setNfcDisabled.setAccessible(true);
Nfc = (Boolean) setNfcDisabled.invoke(mNfcAdapter);
success = Nfc;
} catch (ClassNotFoundException e) {
} catch (NoSuchMethodException e) {
} catch (IllegalArgumentException e) {
} catch (IllegalAccessException e) {
} catch (InvocationTargetException e) {
}
}
if (success) {
Log.d(TAG, "Successfully changed NFC enabled state to "+ desiredState);
} else {
Log.w(TAG, "Error setting NFC enabled state to "+ desiredState);
}
}
}.start();
return false;
}//end method
This requires 2 permissions though, put them in the manifest:
<!-- change NFC status toggle -->
<uses-permission android:name="android.permission.NFC" />
<uses-permission android:name="android.permission.WRITE_SECURE_SETTINGS" />
The NFC button's state switches accordingly when the code is used, so there are no issues when doing it manually in the seetings menu.

If you can see the NfcService Application Source Code, there is a Interface file INfcAdapter.aidl. In the file two API's are there namely "boolean enable()" and "boolean disable()". You can directly use this API's to enable and disable NfcService through an android application. But the trick over here is that you can not compile the code using SDK provided by the Android. You have to compile the application using the a makefile. I have successfully build a application.

I hope this forum would be help you to resolve this issue as well to get the clear understanding on the NFC power on/off API barries.
http://ranjithdroid.blogspot.com/2015/11/turn-onoff-android-nfc-by.html