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POJava null pointer exception on using simple Intent Extra
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copied!<p>When I try to send some text over to the next <code>Activity</code> the program crashes saying "null pointer exception unable to start activity" but without using <code>Intent Extra</code> the <code>Intent</code> works fine.</p> <p><strong>Main Activity</strong></p> <pre><code>public class MainActivity extends Activity implements OnClickListener{ EditText et; public final static String KEY="com.example.myprotrial"; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); et = (EditText) findViewById(R.id.editText1); Button btn =(Button)findViewById(R.id.button1); btn.setOnClickListener(this); } @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; } @Override public void onClick(View arg0) { Intent i = new Intent(MainActivity.this,MyActivity.class); i.putExtra(KEY, et.getText().toString()); startActivity(i); } } </code></pre> <p><strong>MyActivity</strong></p> <pre><code>public class MyActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_my); Intent intent=getIntent(); String a = intent.getStringExtra(MainActivity.KEY); TextView tv = (TextView) findViewById(R.id.textView1); tv.setText(a); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.my, menu); return true; } } </code></pre> <p><strong>LogCat</strong></p> <pre><code>12-09 13:58:33.115: E/AndroidRuntime(1588): FATAL EXCEPTION: main 12-09 13:58:33.115: E/AndroidRuntime(1588): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.myprotrial/com.example.myprotrial.MyActivity}: java.lang.NullPointerException 12-09 13:58:33.115: E/AndroidRuntime(1588): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2211) 12-09 13:58:33.115: E/AndroidRuntime(1588): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261) 12-09 13:58:33.115: E/AndroidRuntime(1588): at android.app.ActivityThread.access$600(ActivityThread.java:141) 12-09 13:58:33.115: E/AndroidRuntime(1588): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256) 12-09 13:58:33.115: E/AndroidRuntime(1588): at android.os.Handler.dispatchMessage(Handler.java:99) 12-09 13:58:33.115: E/AndroidRuntime(1588): at android.os.Looper.loop(Looper.java:137) 12-09 13:58:33.115: E/AndroidRuntime(1588): at android.app.ActivityThread.main(ActivityThread.java:5103) 12-09 13:58:33.115: E/AndroidRuntime(1588): at java.lang.reflect.Method.invokeNative(Native Method) 12-09 13:58:33.115: E/AndroidRuntime(1588): at java.lang.reflect.Method.invoke(Method.java:525) 12-09 13:58:33.115: E/AndroidRuntime(1588): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737) 12-09 13:58:33.115: E/AndroidRuntime(1588): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 12-09 13:58:33.115: E/AndroidRuntime(1588): at dalvik.system.NativeStart.main(Native Method) 12-09 13:58:33.115: E/AndroidRuntime(1588): Caused by: java.lang.NullPointerException 12-09 13:58:33.115: E/AndroidRuntime(1588): at com.example.myprotrial.MyActivity.onCreate(MyActivity.java:18) 12-09 13:58:33.115: E/AndroidRuntime(1588): at android.app.Activity.performCreate(Activity.java:5133) 12-09 13:58:33.115: E/AndroidRuntime(1588): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087) 12-09 13:58:33.115: E/AndroidRuntime(1588): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2175) 12-09 13:58:33.115: E/AndroidRuntime(1588): ... 11 more </code></pre>

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