ActivityNotFoundException?

I've had this issue too, as perfectly concisely described by jpahn.

the period at the front did not give any help to me.

even with exactly this (a copy of the original question including edits), I would still get ActivityNotFoundException.

Main.java

Intent intent = new Intent();
 intent.setAction("com.test.app.TEST");
 startActivity(intent); // ActivityNotFoundException

Manifest.xml

<activity android:name=".MainActivity" android:theme="@android:style/Theme.Dialog">
    <intent-filter>
        <action android:name="com.test.app.TEST" />
    </intent-filter>
</activity>

This was resolved, after much trial-and-error, by simply adding this to the intent-filter in the manifest:

<category android:name="android.intent.category.DEFAULT" />

So the final manifest file contained:

<activity android:name=".MainActivity" android:theme="@android:style/Theme.Dialog">
    <intent-filter>
        <action android:name="com.test.app.TEST" />
        <category android:name="android.intent.category.DEFAULT" />
    </intent-filter>
</activity>

I got this error after moving an activity class from one package to another. Clean build solved it (Project -> Clean).

Be sure to declare your activity in the manifest.xml within the aplication:

<application>
    <activity android:name=".YourNewActivity"/>
</application>

To start the new Activity:

Intent intent = new Intent(main.this, YourNewActivity.class);
startActivity(intent);

Where main stands for the current activity,

Add a . (dot) before your activity name in Android Manifest. So it should be android:name=".WordsToSpeakMainActivity"

I have some addition to the @Tom Pace answer. The answer is completely right, but to make it more clear:

ActivityNotFoundException occurs because of absence of

<category android:name="android.intent.category.DEFAULT" />

Because when Android OS see this in the manifest file, understands that this activity can receive intent.

The point ActivityNotFoundException thrown is that, when activity(intent-creator-activity) tries to create intent for other activity(intent-receiver-activity), Android OS sees there is intent for receiver activity but receiver activity does not receive anyone. Then Android OS returns null or empty intent to intent-creator-activity. And startActivity throws that exception.

I have found a code from android developers to avoid this exception:

// Verify the original intent will resolve to at least one activity
if (sendIntent.resolveActivity(getPackageManager()) != null) {
    startActivity(chooser);
}

Android Developers: Intent Filters

ActivityNotFoundException?

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