Android app crash: Unable to instantiate activity ComponentInfo

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?

score 0 · Answer 1 · answered Jul 18 '12 at 04:17

0

use this:

Intent i = new Intent(context,otherActivity.class);

context of that activity from where you want to start activity.otherActivity is the name of activity which you want to start

answered Jul 18 '12 at 04:17

Zaz Gmy

4,236
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what are you doing??? see this http://developer.android.com/reference/android/content/Intent.html#Intent(android.content.Context, java.lang.Class>) – Zaz Gmy Jul 18 '12 at 04:29

score 0 · Answer 2 · answered Jul 18 '12 at 04:27

0

Try this once

Intent i = new Intent(MainActivity.this,Home.class);
i.putExtra("myname", myname);
startActivity(i);

And I don't think this is required in Manifest

        <intent-filter>
            <action android:name="com.liamwli.fa.yearbook.HOME" />
            <category android:name="android.intent.category.DEFAULT" />
        </intent-filter>

answered Jul 18 '12 at 04:27

Nirali

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Can you tell me what is your activity name exactly? Its MainActivity.java and Home.java ? – Nirali Jul 18 '12 at 04:39
MainActivity.java and Home.java, yes. – Liam W Jul 18 '12 at 04:43
You have removed those lines from manifest that I specify and tried once? – Nirali Jul 18 '12 at 04:44

score 0 · Answer 3 · answered Jul 18 '12 at 04:27

0

change like this

Intent i = new Intent(MainActivity.this, Home.class);
i.putExtra("myname", myname);
startActivity(i);

answered Jul 18 '12 at 04:27

RajaReddy PolamReddy

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score 0 · Answer 4 · answered Jul 18 '12 at 04:27

0

Try this...

Intent i = new Intent( YourActivityName.this , otherActivity.class);

answered Jul 18 '12 at 04:27

Kumar Vivek Mitra

33,294
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score 0 · Accepted Answer · answered Jul 27 '12 at 10:13

0

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.

answered Jul 27 '12 at 10:13

Liam W

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Android app crash: Unable to instantiate activity ComponentInfo

5 Answers5