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POPassing String error
 

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    <p>I'm trying to pass a string from an activity to another. I went through many of the questions refering to "Intents" and "Passing strings" but I keep getting the same error. Could someone point me out where I'm mistaken? Here's my code</p> <p>First Activity</p> <pre><code> package com.example.youtube; import android.os.Bundle; import android.app.Activity; import android.app.AlertDialog; import android.content.DialogInterface; import android.content.Intent; import android.text.Editable; import android.view.Menu; import android.widget.EditText; import android.widget.TextView; public class Testing extends Activity { public static String IPAddress = ""; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_testing); //Alert Popup AlertDialog.Builder alert = new AlertDialog.Builder(this); alert.setTitle("Step 1"); alert.setMessage("Enter IP Address\n(i.e: 192.168.0.1)"); // Set an EditText view to get user input final EditText input = new EditText(this); alert.setView(input); alert.setPositiveButton("Ok", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int whichButton) { Editable value = input.getText(); // Do something with value! IPAddress = value.toString(); //Fire that second activity Intent intent = new Intent( getBaseContext(),LoginIn.class); intent.putExtra("keyword1",IPAddress); startActivity( intent); if (IPAddress != ""){ startActivity(new Intent("com.example.youtube.LoginIn")); } } }); alert.setNegativeButton("Cancel", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int whichButton) { // Canceled. finish(); System.exit(0); } }); alert.show(); } @Override protected void onDestroy() { // TODO Auto-generated method stub super.onDestroy(); } @Override protected void onPause() { // TODO Auto-generated method stub finish(); System.exit(0); } } </code></pre> <p>Second Activity</p> <pre><code> package com.example.youtube; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.TextView; import android.app.Activity; import android.content.Intent; public class LoginIn extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.login); Button bverify = (Button) findViewById(R.id.verify1); final TextView testview = (TextView) findViewById(R.id.textView3); Bundle extras=getIntent().getExtras(); String value1=extras.getString("keyword1"); bverify.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { // TODO Auto-generated method stub startActivity(new Intent("com.example.youtube.domotique")); } }); } @Override protected void onDestroy() { // TODO Auto-generated method stub super.onDestroy(); } @Override protected void onPause() { // TODO Auto-generated method stub finish(); System.exit(0); } } </code></pre> <p>Manifest</p> <pre><code> &lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.youtube" android:versionCode="1" android:versionName="1.0" &gt; &lt;uses-sdk android:minSdkVersion="8" android:targetSdkVersion="16" /&gt; &lt;application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" &gt; &lt;activity android:name=".Testing" android:label="@string/app_name" &gt; &lt;intent-filter&gt; &lt;action android:name="android.intent.action.MAIN" /&gt; &lt;category android:name="android.intent.category.LAUNCHER" /&gt; &lt;/intent-filter&gt; &lt;/activity&gt; &lt;activity android:name=".LoginIn" android:label="@string/app_name" &gt; &lt;intent-filter&gt; &lt;action android:name="com.example.youtube.LoginIn" /&gt; &lt;category android:name="android.intent.category.DEFAULT" /&gt; &lt;/intent-filter&gt; &lt;/activity&gt; &lt;activity android:name=".domotique" android:label="@string/app_name" &gt; &lt;intent-filter&gt; &lt;action android:name="com.example.youtube.domotique" /&gt; &lt;category android:name="android.intent.category.DEFAULT" /&gt; &lt;/intent-filter&gt; &lt;/activity&gt; &lt;/application&gt; &lt;/manifest&gt; </code></pre> <p>Logcat</p> <pre><code> threadid=1: thread exiting with uncaught exception (group=0x40020ac0) FATAL EXCEPTION: main Unable to start activity ComponentInfo{com.example.youtube/com.example.youtube.LoginIn}: java.lang.NullPointerException at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679) at android.app.ActivityThread.access$2300(ActivityThread.java:125) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:123) at android.app.ActivityThread.main(ActivityThread.java:4627) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:521) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:878) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:636) at dalvik.system.NativeStart.main(Native Method) Caused by: java.lang.NullPointerException at com.example.youtube.LoginIn.onCreate(LoginIn.java:23) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627) </code></pre> <p>I tried many form of Intent, and at different location in my code but my App keeps crashing when pressing "Ok", when my Second activity is launched.</p> <p>Thanks for any help!!</p>
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    3. CODon't compare strings with `==` use `.equals()` instead.
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