Question

07-18 04:48:22.465: E/AndroidRuntime(19105): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.liamwli.fa.yearbook/com.liamwli.fa.yearbook.Home}: java.lang.NullPointerException

That is the error I get.

I have defined the Home class in the manifest:

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.liamwli.fa.yearbook"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="15" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name"
            android:theme="@android:style/Theme.Holo" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name=".Home"
            android:label="@string/app_name"
            android:theme="@android:style/Theme.Holo" >
            <intent-filter>
                <action android:name="com.liamwli.fa.yearbook.HOME" />

                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
        </activity>
    </application>

</manifest>

And it only started doing this when I added the putExtras line in my main activity:

enter.setOnClickListener(new View.OnClickListener() {


            @Override
            public void onClick(View arg0) {
                // TODO Auto-generated method stub

                myname = name.getText().toString();
                Intent i = new Intent("com.liamwli.fa.yearbook.HOME");
                i.putExtra("myname", myname);
                startActivity(i);       
            }
        });

So, can anyone please explain what is happening?

Answer 1

Ok, I looked and it looked like I was setting a variable contents outside of the onCreate method. So that is why it wasn’t working.