[Q] How select preferred network operators automatically? - Android Q&A, Help & Troubleshooting

Hallo,
I want to select preferred network operators automatically from device.
After I search for it, I found following:
Code:
final int EVENT_AUTO_SELECT_DONE = 300;
Message msg = mHandler.obtainMessage(EVENT_AUTO_SELECT_DONE);
phone.setNetworkSelectionModeAutomatic(msg);
So I need an instance of class "Phone". I tried this:
Code:
String phoneFactoryName = "com.android.internal.telephony.PhoneFactory";
String phoneName = "com.android.internal.telephony.Phone";
Class phoneFactoryClass = Class.forName(phoneFactoryName);
Class phoneClass = Class.forName(phoneName);
Method getDefaultPhone = phoneFactoryClass.getMethod("getDefaultPhone");
Object phoneObject = getDefaultPhone.invoke(null);
But the method "getDefaultPhone" can only called by looper.
Next I tried this:
Code:
String phoneAppName = "com.android.phone.PhoneApp";
Class phoneAppClass = Class.forName(phoneAppName);
Method getInstanceMethod = phoneAppClass.getMethod("getInstance");
Object phoneObject = getInstanceMethod.invoke(null);
But I get a ClassNotFoundException.
Can anybody help me, please?

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sorry ,i can't help you

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Yes it can be instantiated. But you have to overcome a couple of hurdles:
In your AndroidManifest.xml set
Code:
android:sharedUserId="android.uid.phone"
within the manifest-Tag. This is required to prevent a SecurityException from being thrown when protected Intents are sent by the methods you may invoke (like android.intent.action.SIM_STATE_CHANGED).
Set
Code:
android:process="com.android.phone"
in your application-Tag. This is required to allow the invocation of getDefaultPhone / makeDefaultPhone.
To do all this your app must be signed with the system signature key.