ActivityNotFoundException?

Question

I am getting an ActivityNotFoundException in the following code:

Main.java

Intent intent = new Intent();
     intent.setAction(\"com.tes         


        

Answer 1

There two types of intents in android framework, 1-Implicit intents that you are using,

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

just add one line in intent filter

<intent-filter>
        <action android:name="com.test.app.TEST" />
        <category android:name="android.intent.category.DEFAULT" />
    </intent-filter>

2- Explicit Intents

Intent i=new Intent(CurrentActivity.this,WhereWeWantToGoActivity.class);

startActivity(i);

Answer 2

To launch an activity by a string definition, use:

Intent intent = new Intent();
intent.setComponent(
        new ComponentName("com.app", "com.app.activity.TheActivity"));
startActivity(intent);

Answer 3

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,

Answer 4

To be safe you can also call your new activity like this:

Intent intent = new Intent();
intent.setClass(this, THECLASSNAME);
startActivity(intent); // 

However, you must add the activity to the androidmanifest - and write a . in front of it, e.g.

<activity android:name=".YOURACTIVITYNAME"></activity>

Answer 5

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

Answer 6

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