找不到活动来处理默认活动的Intent

Question

I get error No Activity found to handle Intent when I try to start Default Activity from another Activity using

Intent start = new Intent("com.name.name.MainActivity");
startActivity(start);
finish();

I guess this is because in AndroidManifest for Default Activity I have android.intent.action.MAIN

  <intent-filter>
              <action android:name="android.intent.action.MAIN" />

              <category android:name="android.intent.category.LAUNCHER" />
  </intent-filter>

Is there a way to start Default Activity from another Activity when Default Activity is finished before?

Answer 1

You are trying to start the activity using the action name..

Note : startActivity() always adds CATEGORY_DEFAULT to an Intent if there is no other category specified(Here you have no category specified in your internt so its default).

Hence, an <intent-filter> for an <activity> always needs a <category> , whether DEFAULT or something else (here it needs default that's why error says No Activity found to handle Intent for Default Activity )

The LAUNCHER category says that this entry point should be listed in the application launcher.

The DEFAULT category is required for the Context.startActivity() method to resolve your activity when its component name is not explicitly specified.

Try to specify two intent filters:

<activity android:name=".MyActivity"
          android:configChanges="orientation|keyboardHidden"
          android:windowSoftInputMode="stateHidden"
          android:screenOrientation="portrait">
    <intent-filter>
          <action android:name="android.intent.action.MAIN"/>
          <category android:name="android.intent.category.LAUNCHER" />
    </intent-filter>
    <intent-filter>
          <action android:name="com.name.name.MainActivity"/>
          <category android:name="android.intent.category.DEFAULT"/>
    </intent-filter>
</activity>

Then you can start the activity using the action name:

Intent intent = new Intent("com.name.name.MainActivity");
startActivity(intent);

or simply you can go with the class name:

Intent intent = new Intent(context, MainActivity.class);
startActivity(intent);

Answer 2

Intent i = new Intent(otheractivity.this, MainActivity.class); startActivity(i);