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POCannot Pass Data to another Activity
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  1. POCannot Pass Data to another Activity
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    copied!<p>I don't know where I am going wrong. all information sources say this is how it's done.a simple pass to here and that's it. What do I have to change so that I can simply pass a number to my second activity? Here is my code</p> <pre><code>public class MainActivity extends Activity { Button returnBtn; EditText senderText; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); returnBtn= (Button) findViewById(R.id.button1); senderText = (EditText) findViewById(R.id.editText1); returnBtn.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub String s = senderText.getText().toString(); Intent i = new Intent(MainActivity.this, SecondActivity.class); i.putExtra("number", s); startActivity(i); } }); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } } </code></pre> <p>Second activity is</p> <pre><code>package com.example.returningnumbers; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.widget.EditText; import android.widget.TextView; public class SecondActivity extends Activity { TextView showNum; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.second_info); showNum = (TextView)findViewById(R.id.textView1); Intent intent = getIntent(); String extraData = intent.getExtras().getString("number"); showNum.setText(extraData); } </code></pre> <p>}</p> <p>Logcat information</p> <pre><code>05-23 19:39:38.520: E/Trace(848): error opening trace file: No such file or directory (2) 05-23 19:39:39.639: D/libEGL(848): loaded /system/lib/egl/libEGL_emulation.so 05-23 19:39:39.649: D/(848): HostConnection::get() New Host Connection established 0x2a154d08, tid 848 05-23 19:39:39.893: D/libEGL(848): loaded /system/lib/egl/libGLESv1_CM_emulation.so 05-23 19:39:39.920: D/libEGL(848): loaded /system/lib/egl/libGLESv2_emulation.so 05-23 19:39:40.220: W/EGL_emulation(848): eglSurfaceAttrib not implemented 05-23 19:39:40.260: D/OpenGLRenderer(848): Enabling debug mode 0 05-23 19:39:45.010: D/AndroidRuntime(848): Shutting down VM 05-23 19:39:45.030: W/dalvikvm(848): threadid=1: thread exiting with uncaught exception (group=0x40a71930) 05-23 19:39:45.120: E/AndroidRuntime(848): FATAL EXCEPTION: main 05-23 19:39:45.120: E/AndroidRuntime(848): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.returningnumbers/com.example.returningnumbers.SecondActivity}: java.lang.NullPointerException 05-23 19:39:45.120: E/AndroidRuntime(848): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180) 05-23 19:39:45.120: E/AndroidRuntime(848): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230) 05-23 19:39:45.120: E/AndroidRuntime(848): at android.app.ActivityThread.access$600(ActivityThread.java:141) 05-23 19:39:45.120: E/AndroidRuntime(848): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234) 05-23 19:39:45.120: E/AndroidRuntime(848): at android.os.Handler.dispatchMessage(Handler.java:99) 05-23 19:39:45.120: E/AndroidRuntime(848): at android.os.Looper.loop(Looper.java:137) 05-23 19:39:45.120: E/AndroidRuntime(848): at android.app.ActivityThread.main(ActivityThread.java:5041) 05-23 19:39:45.120: E/AndroidRuntime(848): at java.lang.reflect.Method.invokeNative(Native Method) 05-23 19:39:45.120: E/AndroidRuntime(848): at java.lang.reflect.Method.invoke(Method.java:511) 05-23 19:39:45.120: E/AndroidRuntime(848): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 05-23 19:39:45.120: E/AndroidRuntime(848): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 05-23 19:39:45.120: E/AndroidRuntime(848): at dalvik.system.NativeStart.main(Native Method) 05-23 19:39:45.120: E/AndroidRuntime(848): Caused by: java.lang.NullPointerException 05-23 19:39:45.120: E/AndroidRuntime(848): at com.example.returningnumbers.SecondActivity.onCreate(SecondActivity.java:20) 05-23 19:39:45.120: E/AndroidRuntime(848): at android.app.Activity.performCreate(Activity.java:5104) 05-23 19:39:45.120: E/AndroidRuntime(848): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080) 05-23 19:39:45.120: E/AndroidRuntime(848): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144) 05-23 19:39:45.120: E/AndroidRuntime(848): ... 11 more 05-23 19:39:45.442: D/dalvikvm(848): GC_CONCURRENT freed 100K, 8% free 2719K/2940K, paused 78ms+118ms, total 548ms 05-23 19:39:48.102: I/Process(848): Sending signal. PID: 848 SIG: 9` </code></pre>
 

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