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I am integrating google now voice search in one my Android applications. There I initiate google assistance by saying "Ok Google" that will listen for my custom command. Then the assistance will match the spoken text with activity using action:

com.google.android.gms.actions.SEARCH_ACTION

Snippet from my AndroidManifest:

 <activity android:name=".activities.GActivity"
 android:launchMode="singleTask">
 <intent-filter>
 <action android:name="com.google.android.gms.actions.SEARCH_ACTION"/>
 <category android:name="android.intent.category.DEFAULT"/>
 </intent-filter>
 </activity>

Then in my activity, I check for the action and the text spoken by the user. Like this:

 import com.google.android.gms.actions.SearchIntents;

 public class GActivity extends AppCompatActivity 

@Override
protected void onCreate(Bundle savedInstanceState) 
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_g);

 // Get the intent
 Intent intent = getIntent();
 if (SearchIntents.ACTION_SEARCH.equals(intent.getAction())) 
 String query = intent.getStringExtra(SearchManager.QUERY);
 Toast.makeText(this,
 query, Toast.LENGTH_SHORT).show();
 

Then, from my terminal, I triggered the intent action with the sample text that is about to be spoken(in dev environment, because voice assistance will work only after release) using the following command.

 adb shell am start -a com.google.android.gms.actions.SEARCH_ACTION 
 --e query "TextToBeSpoken" my.package.name

I follow this link from android

Support search queries from Google Voice Actions

Use Voice Search to integrate with Google Now

The problem is after I give the command from the terminal, My activity launched successfully, but I can not get the spoken text from the intent object, that is always null.

 String query = intent.getStringExtra(SearchManager.QUERY);

Can anyone tell me why the above line returns null? Any workaround for this?