android - 当从另一个活动调用 AndARActivity 时，为什么不绘制 ARObjects？

Question

当我开始AndARActivity作为主要活动时，相机被激活并且ARObjects将被正确绘制。如果我AndARActivity从另一个 normal调用Activity，相机会被激活，但ARObjects不会被绘制。

为什么没有ARObjects被绘制？

BreakoutARActivity.java

public class BreakoutARActivity extends AndARActivity

主要的.xml

<ImageButton
        android:id="@+id/play"
        style="@style/dashButtonStyle"
        android:layout_marginTop="20dp"
        android:contentDescription="@string/play"
        android:onClick="play"
        android:src="@drawable/play" />

清单.xml

     <activity
        android:label="@string/app_name"
        android:name=".BreakoutLauncherActivity"
        android:screenOrientation="landscape">
        <intent-filter >
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>

    <activity
        android:label="@string/app_name"
        android:name=".BreakoutARActivity"
        android:screenOrientation="landscape">
         <intent-filter >
            <action android:name="ch.bfh.ti.breakoutar.activity.BreakoutARActivity" />
            <category android:name="android.intent.category.DEFAULT" />
        </intent-filter>
    </activity>

BreakoutLauncherActivity.java

public class BreakoutLauncherActivity extends Activity {


@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    setContentView(R.layout.main);
}

public void play(View view){
    Intent intent = new Intent(this, BreakoutARActivity.class);
    intent.setAction(Intent.ACTION_VIEW);
    startActivity(intent);
}