Develop Reference

youtubeExtractor for Android

I want to use youtubeExtractor for android app and I found library like
compile 'com.github.HaarigerHarald:android-youtubeExtractor:master-SNAPSHOT'
There is a sample code in github I copied it. After I open app, it closes at the same time. There isn't an error in phone and also Logcat. Only there is
W/System: ClassLoader referenced unknown path: /data/app/oz.videos-1/lib/arm64 on logcat. I am not sure this is a error or not. Any suggestion? Thanks in advance.
import android.app.Activity;
import android.app.DownloadManager;
import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.util.SparseArray;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.ProgressBar;
import android.widget.Toast;
import at.huber.youtubeExtractor.VideoMeta;
import at.huber.youtubeExtractor.YouTubeExtractor;
import at.huber.youtubeExtractor.YtFile;
public class MainActivity extends Activity
{
private static String youtubeLink;
private LinearLayout mainLayout;
private ProgressBar mainProgressBar;
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mainLayout = (LinearLayout) findViewById(R.id.main_layout);
mainProgressBar = (ProgressBar) findViewById(R.id.prgrBar);
// Check how it was started and if we can get the youtube link
if (savedInstanceState == null && Intent.ACTION_SEND.equals(getIntent().getAction())
&& getIntent().getType() != null && "text/plain".equals(getIntent().getType()))
{
String ytLink = getIntent().getStringExtra(Intent.EXTRA_TEXT);
if (ytLink != null
&& (ytLink.contains("://youtu.be/") || ytLink.contains("youtube.com/watch?v=")))
{
youtubeLink = ytLink;
// We have a valid link
getYoutubeDownloadUrl(youtubeLink);
}
else
{
Toast.makeText(this, R.string.error_no_yt_link, Toast.LENGTH_LONG).show();
finish();
}
} else if (savedInstanceState != null && youtubeLink != null) {
getYoutubeDownloadUrl(youtubeLink);
} else {
finish();
}
}
private void getYoutubeDownloadUrl(String youtubeLink)
{
new YouTubeExtractor(this)
{
#Override
public void onExtractionComplete(SparseArray<YtFile> ytFiles, VideoMeta vMeta) {
mainProgressBar.setVisibility(View.GONE);
if (ytFiles == null) {
// Something went wrong we got no urls. Always check this.
finish();
return;
}
// Iterate over itags
for (int i = 0, itag; i < ytFiles.size(); i++) {
itag = ytFiles.keyAt(i);
// ytFile represents one file with its url and meta data
YtFile ytFile = ytFiles.get(itag);
// Just add videos in a decent format => height -1 = audio
if (ytFile.getFormat().getHeight() == -1 || ytFile.getFormat().getHeight() >= 360) {
addButtonToMainLayout(vMeta.getTitle(), ytFile);
}
}
}
}.extract(youtubeLink, true, false);
}
private void addButtonToMainLayout(final String videoTitle, final YtFile ytfile)
{
// Display some buttons and let the user choose the format
String btnText = (ytfile.getFormat().getHeight() == -1) ? "Audio " +
ytfile.getFormat().getAudioBitrate() + " kbit/s" :
ytfile.getFormat().getHeight() + "p";
btnText += (ytfile.getFormat().isDashContainer()) ? " dash" : "";
Button btn = new Button(this);
btn.setText(btnText);
btn.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
String filename;
if (videoTitle.length() > 55) {
filename = videoTitle.substring(0, 55) + "." + ytfile.getFormat().getExt();
} else {
filename = videoTitle + "." + ytfile.getFormat().getExt();
}
filename = filename.replaceAll("\\\\|>|<|\"|\\||\\*|\\?|%|:|#|/", "");
downloadFromUrl(ytfile.getUrl(), videoTitle, filename);
finish();
}
});
mainLayout.addView(btn);
}
private void downloadFromUrl(String youtubeDlUrl, String downloadTitle, String fileName)
{
Uri uri = Uri.parse(youtubeDlUrl);
DownloadManager.Request request = new DownloadManager.Request(uri);
request.setTitle(downloadTitle);
request.allowScanningByMediaScanner();
request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, fileName);
DownloadManager manager = (DownloadManager) getSystemService(Context.DOWNLOAD_SERVICE);
manager.enqueue(request);
}
}

Please try to implement the version 2.0.0 of the library:
implementation 'com.github.HaarigerHarald:android-youtubeExtractor:v2.0.0'

May be your savedInstanceState == null, and then finish() method called.
Try call getYoutubeDownloadUrl() with youtube link after mainProgressBar = (ProgressBar) findViewById(R.id.prgrBar);

Activity closes on button press

I'm having a bit of trouble with a simple app I'm making.
I'll include the code:
import android.app.ProgressDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.protocol.BasicHttpContext;
import org.apache.http.protocol.HttpContext;
import java.net.URL;
public class login extends AppCompatActivity {
EditText user;
EditText pass;
boolean result_back;
private ProgressDialog pDialog;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
Button log = (Button) findViewById(R.id.btLogIn2);
log.setOnClickListener(new View.OnClickListener()
{
#Override
public void onClick(View v)
{
login(v);
}
});
}
public void login(View v)
{
HttpClient client = new DefaultHttpClient();
HttpContext localContext = new BasicHttpContext();
HttpResponse response = null;
user = (EditText) findViewById(R.id.eTUser);
String usuario = user.toString();
pass = (EditText) findViewById(R.id.eTPass);
String passw = pass.toString();
String parametros = "?usuario=" + usuario + "&password=" + passw;
HttpGet httpGet = new HttpGet("http://gie.byethost.com/acces.php" + parametros);
Toast toast2 = Toast.makeText(getApplicationContext(), "Enviando datos", Toast.LENGTH_SHORT);
toast2.show();
try
{
response = client.execute(httpGet, localContext);
toast2 = Toast.makeText(getApplicationContext(), response.toString(), Toast.LENGTH_SHORT);
toast2.show();
}
catch (Exception e)
{
}
// response.toString();
if (response.toString().equalsIgnoreCase("1"))
{
Toast toast1 = Toast.makeText(getApplicationContext(), "Login correcto", Toast.LENGTH_SHORT);
toast1.show();
} else
if (response.toString().equalsIgnoreCase("0"))
{
Toast toast1 = Toast.makeText(getApplicationContext(), "Error de login", Toast.LENGTH_SHORT);
toast1.show();
}
}
}
There's only one button here and neither toast is showing, so I don't see where the app is crashing. Also, I'm a bit new in Android programming, so this may have an obvious solution.
Any comments will be appreciated!

You're doing a network transaction on the main thread. Never do that (or any blocking behavior) on the main thread. Your app might be crashing with an error in logcat related to "StrictMode".
Instead, you need to put all your blocking work on another thread. Android has very specific patterns about how to do that. It's not like you would expect in a normal java app.
You might want to consider doing a search for "android asynchronous programming" and learn about things like AsyncTask, Loader, and Service. There are a lot of great tutorials out there on how to use them. Please don't use Thread directly, as that will only cause you pain.

Catch statements not working in android

I am working with an android database oriented program. This activity is from one of my tab. When i press that particular tab it will get the value from the db and if any null values from the db it will catch it and show an alertbox and changing to another tab. This is my logic. But it is not executing the catch block. It is going straight to the webview and showing there a null value. Please anyone help me to fix this error.Here is my class...
LocationActivity
import java.util.List;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.Window;
import android.webkit.WebChromeClient;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.widget.ProgressBar;
#SuppressLint("SetJavaScriptEnabled")
public class LocationActivity extends Activity {
MainTabActivity mainTab;
WebView mWebView;
GPSTracker g;
double my_lat, my_lon;
String lat, lon, to_lat, to_lon, addressText, temp_lat, temp_lon;
DatabaseHandler db;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
db = new DatabaseHandler(this);
g = new GPSTracker(this);
Log.d("Reading: ", "Location Activity Reading all Values");
List<Datas> datas = db.getAllDatas();
for (Datas dat : datas) {
try{
to_lat = dat.getlat();
to_lon = dat.getlon();
}catch(NullPointerException e){
AlertDialog.Builder alert = new AlertDialog.Builder(this);
alert.setTitle("Oops!");
// set dialog message
alert
.setMessage("Please select a destination before finding your route!")
.setCancelable(false)
.setPositiveButton("ok",new DialogInterface.OnClickListener() {
#SuppressWarnings("deprecation")
public void onClick(DialogInterface dialog,int id) {
((MainTabActivity)getParent()).getTabHost().setCurrentTab(0);
}
});
// create alert dialog
AlertDialog alertDialog = alert.create();
// show it
alertDialog.show();
Log.d(to_lat, to_lon);
System.out.println("Frim thap thee "+ to_lat + " " + to_lon);
}
}
setContentView(R.layout.webview);
getWindow().setFeatureInt(Window.FEATURE_PROGRESS,Window.PROGRESS_VISIBILITY_ON);
final ProgressBar pb = (ProgressBar) findViewById(R.id.progressBar1);
pb.setVisibility(View.VISIBLE);
my_lat = g.getLatitude();
my_lon = g.getLongitude();
lat = String.valueOf(my_lat);
lon = String.valueOf(my_lon);
mWebView = (WebView)findViewById(R.id.webview1);
mWebView.setWebChromeClient(new WebChromeClient() {
public void onProgressChanged(WebView view, int progress) {
pb.setProgress(progress);
if (progress == 100) {
pb.setVisibility(View.GONE);
}
}
});
WebSettings webSettings = mWebView.getSettings();
webSettings.setJavaScriptEnabled(true);
mWebView.setWebViewClient(new HelloWebViewClient());
addressText = lat + "," + lon + "+to:" + to_lat + ","+ to_lon;
addressText = addressText.replaceAll(" ", "%20");
addressText = addressText.replaceAll("#", "%23");
mWebView.loadUrl("http://maps.google.com/maps?q=from:"+ addressText);
}
}

getlat and getlon may be null, and therefore not throw an exception. You should replace your try/catch with a if statement which checks for null.
Furthermore the real problem of you NullPointerException is:
Log.d(to_lat, to_lon);
Log.d should be used with the TAG as first param, and the String as second:
Log.d("LOCATION", "From " + to_lat + ", to " + to_lon);
If to_lat and to_lon are null:
log.d(null, null);
will definately cause a crash.

Setting strings to null is by itself not an issue and will not throw a NullPointerException.
However if you would try to call a method on String that is null you would get an Exception.
String s = null; //no problem
s.isEmpty(); //Would throw a nullpointer exception
Remove the try catch clause and do a simple check with if statements
to_lat = dat.getlat();
to_lon = dat.getlon();
if(to_lat == null || to_long == null()
{
//Show the alert
}

first check if you are getting anything in the datas using
if(datas.size()>0)
and then use the for loop.

to_lat, to_lon are Strings and they can be null. So why do you expect to have NPE in the catch block?

Finish an activity,get string typed result from a class and use that result to another activity

I'm new in android environment and started a Software development project, so my knowledge is too few in it. I need help in detail.
Problem details:
Project is on ANDROID OCR code source from github Robert m.theis
currently it's outcome is - while i take an image of any written text,it retrieves quite exact output using tesseract engine as text and search in internet.
my work is -
use the text string (digits ) and call to a phone operator.
my project name is automated mobile card recharging system.
so that i took result text from a method getText() class named OcrResult.java and put into my own activity. But i don't know why this don't working in real device.
it builds, run in emulator, but in real device at least it should show messages! But it doesn't.
i also added in manifest.xml file as (angel braces are remover here)
under activity
activity android:name="edu.sfsu.cs.orange.ocr.call.CallManager"
under application
uses-permission android:name="android.permission.CALL_PHONE"
here my code is
package edu.sfsu.cs.orange.ocr.call;
import edu.sfsu.cs.orange.ocr.OcrResult;
import edu.sfsu.cs.orange.ocr.CaptureActivity;
import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.SurfaceHolder;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.Toast;
public class CallManager extends Activity
{
public static final String preString = "*111*";
public static final String postString = "#";
//to store retrieved digits
String finalString;
//to get text result from ocr result
OcrResult getStringResult = new OcrResult();
String middleString = getStringResult.getText();
//if it fails to scan desired digit,call the process again
CaptureActivity tryProcessAgain = new CaptureActivity();
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
}
public void setString(String x)
{
middleString = x;
}
public String getString( String toBeInserted)
{
if(toBeInserted.length() == 16)
{
int counter = 0;
char [] insertHere = new char[16];
for(int verifier = 0; verifier < 16; verifier ++)
{
insertHere[verifier] = toBeInserted.charAt(verifier);
if(!Character.isDigit(insertHere[verifier]))
{
break;
}
counter ++;
}
if(counter == 16)
{
finalString = preString + toBeInserted + postString;
return finalString;
}
else
{
// #SuppressWarnings("unused")
//Toast toast = Toast.makeText(this, " number scan invalid.....OCR failed. Please try again.", Toast.LENGTH_SHORT);
//toast.show();
return middleString;
}
}
else
{
//#SuppressWarnings("unused")
//Toast toast = Toast.makeText(this, " number scannin invalid...OCR failed. Please try again.", Toast.LENGTH_SHORT);
//toast.show();
return middleString;
}
}
public void CallToOperator(String callMe)
{
Toast toast = Toast.makeText(this,finalString,Toast.LENGTH_SHORT);
toast.show();
//Toast toast1 = Toast.makeText(this,middleString,Toast.LENGTH_SHORT);
//toast1.show();
if(callMe == finalString)
{
try
{
startActivity(new Intent(Intent.ACTION_CALL, Uri.parse("tel:" + finalString)));
}
catch (Exception e)
{
e.printStackTrace();
}
}
else
{
tryProcessAgain.onShutterButtonPressContinuous();
}
}
}

login Issue in android

I have a login page, it works fine when i put correct username and password but for login failure its not working how to handle this.
In android i don't have any idea if any one can provide code please
here is my code :
package com.android;
import java.io.IOException;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.Intent;
import android.graphics.Typeface;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import org.json.JSONException;
import org.json.JSONObject;
import org.ksoap2.SoapEnvelope;
import org.ksoap2.SoapFault;
import org.ksoap2.serialization.SoapObject;
import org.ksoap2.serialization.SoapPrimitive;
import org.ksoap2.serialization.SoapSerializationEnvelope;
import org.ksoap2.transport.AndroidHttpTransport;
import org.xmlpull.v1.XmlPullParserException;
import android.view.View.OnClickListener;
import android.view.Window;
import android.widget.*;
public class Login extends Activity {
private static final String NAMESPACE = "http://tempuri.org/";
private static final String URL ="http:.asmx?op=LoginRequest";
private static final String SOAP_ACTION = "http://tempuri.org/Login";
//private String login="";
private static final String METHOD_NAME = "Login";
ImageButton login_button,sign_button;
TextView m,p,f,email,password,forgot_password;
EditText emailid,epassword;
AlertDialog authProgressDialog;
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.login);
email=(TextView)findViewById(R.id.email);
password=(TextView)findViewById(R.id.password);
forgot_password=(TextView)findViewById(R.id.forgot);
Context context = email.getContext();
Typeface font=Typeface.createFromAsset(context.getAssets(),"arial.ttf");
email.setTypeface(font);
Context con = password.getContext();
Typeface face=Typeface.createFromAsset(con.getAssets(),"arial.ttf");
password.setTypeface(face);
Context con1 = forgot_password.getContext();
Typeface face1=Typeface.createFromAsset(con1.getAssets(),"arial.ttf");
forgot_password.setTypeface(face1);
// new theTask().execute();
login_button=(ImageButton)findViewById(R.id.login);
sign_button=(ImageButton)findViewById(R.id.signup);
login_button.setOnClickListener(new OnClickListener(){
public void onClick(View v) {
String username,password;
emailid =(EditText)findViewById(R.id.edemail);
epassword =(EditText)findViewById(R.id.edpassword);
username = emailid.getText().toString();
password = epassword.getText().toString();
showDialog(0);
// TODO Auto-generated method stub
SoapObject request=new SoapObject(NAMESPACE,METHOD_NAME);
String qry="{\"General\":"+"{\"type\": \"Request\","+"\"application\": \"Mmmmm\","+"\"appver\": \"1.0.0\","+"\"phoneDeviceID\": \"123456789\","+"\"deviceType\": \"Android\","+"\"deviceOSVersion\": \"3.0\"},"+"\"Login\":"+"{\"emailID\":"+"\""+username+"\","+"\"password\":"+"\""+password+"\""+"}"+"}";
Log.i("Input",qry);
request.addProperty("JSONRequestString",qry);
SoapSerializationEnvelope envelope=new SoapSerializationEnvelope(SoapEnvelope.VER11);
envelope.dotNet=true;
envelope.bodyOut=request;
envelope.encodingStyle=SoapSerializationEnvelope.ENC2001;
envelope.setOutputSoapObject(request);
AndroidHttpTransport androidHttpTransPort= new AndroidHttpTransport(URL);
try
{
try {
androidHttpTransPort.call(SOAP_ACTION,envelope);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
SoapPrimitive rest=(SoapPrimitive)envelope.getResponse();
Log.i("output","Result"+rest );
// SoapObject var = (SoapObject)rest.getProperty(0);
String conv=rest.toString();
JSONObject js=new JSONObject(conv);
String login = js.getString("Login");
JSONObject err=new JSONObject(login);
String messcode=js.getString("HomePageFooterNewUpdates");
JSONObject code=new JSONObject(messcode);
int GetMessageCode=code.getInt("noOfMail");
Log.i("message code ","is " +GetMessageCode);
// String errc=err.getString("errorMsg");
// Log.i("err",errc);
int ResponseForLogin=err.getInt("errorCode");
Log.i("Response ","is "+ResponseForLogin);
if(ResponseForLogin==000){
Toast.makeText(Login.this, "Login Successfull", Toast.LENGTH_LONG).show();
// prepare the dialog box
/* ProgressDialog dialog = new ProgressDialog(this);
// make the progress bar Cancelable
dialog.setCancelable(true);
// set a message text
dialog.setMessage("Loading...");
// show it
dialog.show();*/
Intent i=new Intent(Login.this,Home.class);
i.putExtra("messcode", GetMessageCode);
startActivity(i);
} else {
Toast.makeText(Login.this, "Invalid Emailid or Password...Please Try Again", Toast.LENGTH_LONG).show();
}
}catch (XmlPullParserException e) {
e.printStackTrace();
}
catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SoapFault e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
} );
sign_button.setOnClickListener(new OnClickListener(){
public void onClick(View v) {
Intent i=new Intent(Login.this, Signup.class);
startActivity(i);
}
});
}
}
Thanks in advance...

Just giving you few hints , try to take help from this.
ImageButton login=(ImageButton)findViewById(R.id.Login);
EditText editText1=(EditText)findViewById(R.id.emailText);
EditText editText2=(EditText)findViewById(R.id.passwordText);
login.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
if((editText1.getText()+" ").trim().equals("") || editText1.getText() == null || (editText2.getText()+" ").trim().equals("") || editText2.getText() == null ){
//show error message here
}
else{
//perrform your action here
//either start a new activity or do something else
}
}
});
Hope this will help you.

I have found the following tutorial which has definitely helped me implement the correct login and registration screens using these resources:
Material Design
Shared Preferences
PHP scripts
MySQL Database
SQLlite Database
This is the link to the tutorial.
I know this is extremely late but I hope it can help you.