how to Fix Unable to find explicit activity class

Question

public class MultiColumnActivity extends Activity implements OnClickListener {
    private ArrayList> list;
    Button filterButton;
         


        

Answer 1

In your manifest file you have to register your DateActivity using <activity> tag not with <application> tag.

 <application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
    android:name="com.nous.demoexample.MultiColumnActivity
    android:label="@string/app_name" >
    <intent-filter>
        <action android:name="android.intent.action.MAIN" />
        <category android:name="android.intent.category.LAUNCHER" />
    </intent-filter>
</activity>
   <activity
    android:name="com.nous.demoexample.Dateactvity
    android:label="@string/app_name"/>

and start your Dateactivity as below:

 Intent intent = new Intent(MultiColumnActivity.this,Dateactvity.class);
    startActivity(intent);

Answer 2

If your activity outside main package then declare like this :

<application android:name="com.nous.demoexample.Dateactvity"></application> 

Instead of

Intent intent = new Intent();

intent.setClassName("com.nous.demoexample", "com.nous.demoexample.Dateactvity");

Write like this :

Intent oIntent = new Intent(getApplicationContext(), com.nous.demoexample.Dateactvity.class);

Answer 3

declare activity in manifest-

<application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity
        android:name="com.example.packageName.MultiColumnActivity
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
</application>

Answer 4

You should make an entry of activity like below

  <activity
        android:name=".Dateactvity" >

    </activity> 

Not under application tag

  <application android:name=".Dateactvity"></application>

http://developer.android.com/guide/topics/manifest/manifest-intro.html

Answer 5

You need to declare like...

<activity android:name="com.nous.demoexample.Dateactvity"></activity>

And use intent like...

 Intent intent = new Intent(MultiColumnActivity.this,Dateactvity.class);
 startActivity(intent);