How To Fix Unable To Find Explicit Activity Class

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

Solution 1:

You need to declare like...

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

And use intent like...

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

Solution 2:

If your activity outside main package then declare like this :

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

Instead of

Intentintent=newIntent();

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

Write like this :

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

Solution 3:

declare activity in manifest-

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

Solution 4:

You should make an entry of activity like below

<activityandroid:name=".Dateactvity" ></activity>

Not under application tag

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

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

Solution 5:

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

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

and start your Dateactivity as below:

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