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POjava.lang.NullPointerException at android.content.ContextWrapper.getPackageName ANDROID
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16745806
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2013-05-25T02:18:11.683
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2016-04-28T06:08:45.920
LastEditDate
2015-01-20T13:30:56.310
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2330482
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2330482
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PostTypeId
1
Score
4
ViewCount
9593
LastEditorDisplayName
text
Body
Hey I want to start an Activity from my MainActivity but not in the oncreate method. <pre><code>public void awe() { Intent myIntent = new Intent(MainActivity.this, Awesome.class); MainActivity.this.startActivity(myIntent); } </code></pre> Another class calls the method awe() and what I get is a crash and <pre><code>05-25 04:06:51.034: E/AndroidRuntime(7161): FATAL EXCEPTION: main 05-25 04:06:51.034: E/AndroidRuntime(7161): java.lang.NullPointerException 05-25 04:06:51.034: E/AndroidRuntime(7161): at android.content.ContextWrapper.getPackageName(ContextWrapper.java:151) 05-25 04:06:51.034: E/AndroidRuntime(7161): at android.content.ComponentName.<init>(ComponentName.java:106) 05-25 04:06:51.034: E/AndroidRuntime(7161): at android.content.Intent.<init>(Intent.java:2895) 05-25 04:06:51.034: E/AndroidRuntime(7161): at package name.MainActivity.awe(MainActivity.java:215) </code></pre> Someone knows what I can do? MainActivity <pre><code>public class MainActivity extends Activity implements OnClickListener { // (variable stuff) protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); buttonE = (Button) findViewById(R.id.buttonEASY); buttonM = (Button) findViewById(R.id.buttonMED); // here I do all that button stuff for the layout } public void onClick(View arg0) { System.out.println("click"); if (arg0==buttonE) { int checkedRadioButton = radioGroup1.getCheckedRadioButtonId(); String radioButtonSelected = ""; switch (checkedRadioButton) { case R.id.radio0 : radioButtonSelected = "radiobutton1"; Toast.makeText(getApplicationContext(), "Easy, 10 selected", Toast.LENGTH_SHORT).show(); setContentView(R.layout.raten); // Button stuff, again. } public void awe() { Intent tutorial = new Intent(MainActivity.this, Awesome.class); if (tutorial != null) { startActivity(tutorial); } } </code></pre> Easy.java Nothing important here, the place where I refer to awe(): <pre><code>if (s==max+1){System.out.println("AWESOME!"); MainActivity mA = new MainActivity(); mA.awe();} </code></pre> Awesome.java <pre><code>public class Awesome extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.awesome); } </code></pre> I hope I now posted everything that is important
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java.lang.NullPointerException at android.content.ContextWrapper.getPackageName ANDROID
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