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POAndroid: Application crash on Start (Opening intent on Button)
 

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  1. POAndroid: Application crash on Start (Opening intent on Button)
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    <p>I am trying to open another activity through Intent on Button press. But the <strong>app crashes every time</strong> on launch.</p> <p><strong>IntentTest.java:</strong></p> <pre><code>package com.example.intenttest; public class IntentTest extends Activity { Button b1; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_intent_test); b1.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Intent intent2 = new Intent(IntentTest.this, IntentTest2.class); startActivity(intent2); } }); } } </code></pre> <p><strong>IntentTest2.java:</strong></p> <pre><code>package com.example.intenttest; public class IntentTest2 extends Activity { TextView textView1; protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_intent_test2); textView1=(TextView)findViewById(R.id.textView1); } } </code></pre> <p><strong>Manifest:</strong></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.intenttest" android:versionCode="1" android:versionName="1.0" &gt; &lt;uses-sdk android:minSdkVersion="11" android:targetSdkVersion="17" /&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="com.example.intenttest.IntentTest" 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:label="@string/app_name" android:name="com.example.intenttest.IntentTest2" /&gt; &lt;/application&gt; &lt;/manifest&gt; </code></pre> <p>Here is the <strong>LogCat</strong> where the app crashes:</p> <pre><code>12-18 11:59:59.563: W/Trace(20985): error opening trace file: No such file or directory (2) 12-18 11:59:59.623: D/AndroidRuntime(20985): Shutting down VM 12-18 11:59:59.623: W/dalvikvm(20985): threadid=1: thread exiting with uncaught exception (group=0x40c8d930) 12-18 11:59:59.633: E/AndroidRuntime(20985): FATAL EXCEPTION: main 12-18 11:59:59.633: E/AndroidRuntime(20985): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.intenttest/com.example.intenttest.IntentTest}: java.lang.NullPointerException </code></pre> <p>I cant find out what is wrong. Please help. </p>
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    1. USAniket Kapse
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    1. COInitialize your button b1 using b1=(Button)findViewById(R.id.b1);
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      1. USVaibhav Agarwal
    2. COX-| I feel embarrassed now. How could I miss that. Thanks a lot.
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