Embedded Android Workshop ESC India 2012
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Embedded Android Workshop ESC India 2012

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Karim Yaghmour's "Embedded Android Workshop" presented at ESC India 2012

Karim Yaghmour's "Embedded Android Workshop" presented at ESC India 2012

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Embedded Android Workshop ESC India 2012 Embedded Android Workshop ESC India 2012 Presentation Transcript

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  • > 1 C CE SBEBpackage com.android.server;import android.content.Context;import android.os.Handler;import android.os.IOpersysService;import android.os.Looper;import android.os.Message;import android.os.Process;import android.util.Log;public class OpersysService extends IOpersysService.Stub { private static final String TAG = "OpersysService"; private OpersysWorkerThread mWorker; private OpersysWorkerHandler mHandler; private Context mContext; public OpersysService(Context context) { super(); mContext = context; mWorker = new OpersysWorkerThread("OpersysServiceWorker"); mWorker.start(); Log.i(TAG, "Spawned worker thread"); } public void setValue(int val) { Log.i(TAG, "setValue " + val); Message msg = Message.obtain(); msg.what = OpersysWorkerHandler.MESSAGE_SET; msg.arg1 = val; mHandler.sendMessage(msg); }
  • private class OpersysWorkerThread extends Thread{ public OpersysWorkerThread(String name) { super(name); } public void run() { Looper.prepare(); mHandler = new OpersysWorkerHandler(); Looper.loop(); } } private class OpersysWorkerHandler extends Handler { private static final int MESSAGE_SET = 0; @Override public void handleMessage(Message msg) { try { if (msg.what == MESSAGE_SET) { Log.i(TAG, "set message received: " + msg.arg1); } } catch (Exception e) { // Log, dont crash! Log.e(TAG, "Exception in OpersysWorkerHandler.handleMessage:", e); } } }}
  • > 71 C CE BApackage android.os;interface IOpersysService {/*** {@hide}*/void setValue(int val);}
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  • >< D CE C SBEB A E B F : 1%( 3 [ (L7 try { Slog.i(TAG, "Opersys Service"); ServiceManager.addService(“opersys”, new OpersysService(context)); } catch (Throwable e) { Slog.e(TAG, "Failure starting OpersysService Service", e); }... <
  • >> = CE C SBEBpackage com.opersys.helloserver;import android.app.Activity;import android.os.Bundle;import android.os.ServiceManager;import android.os.IOpersysService;import android.util.Log;public class HelloServer extends Activity { private static final String DTAG = "HelloServer"; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); IOpersysService om =IOpersysService.Stub.asInterface(ServiceManager.getService("opersys")); try { Log.d(DTAG, "Going to call service"); om.setValue(20); Log.d(DTAG, "Service called succesfully"); } catch (Exception e) { Log.d(DTAG, "FAILED to call service"); e.printStackTrace(); } } >}
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  • B F87public class HelloJni extends Activity{ /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); /* Create a TextView and set its content. * the text is retrieved by calling a native * function. */ TextView tv = new TextView(this); tv.setText( stringFromJNI() + " " + pid() ); setContentView(tv); } /* A native method that is implemented by the * hello-jni native library, which is packaged * with this application. */ public native String stringFromJNI();... /* this is used to load the hello-jni library on application * startup. The library has already been unpacked into * /data/data/com.example.HelloJni/lib/libhello-jni.so at * installation time by the package manager. */ static { System.loadLibrary("hello-jni"); }} G
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  • B AC A ]accessibilityservice content hardware pim speechaccounts database inputmethodservice preference testannotation ddm net provider textapp debug nfc security utilappwidget emoji os server viewbluetooth gesture service webkit widget
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  • B ! : 7D SBEB...import android.os.IOpersysService;import android.os.OpersysManager;... private DownloadManager mDownloadManager = null; private NfcManager mNfcManager = null; private OpersysManager mOpersysManager = null;... return getDownloadManager(); } else if (NFC_SERVICE.equals(name)) { return getNfcManager(); } else if (OPERSYS_SERVICE.equals(name)) { return getOpersysManager(); }... >
  • private OpersysManager getOpersysManager() { synchronized (mSync) { if (mOpersysManager == null) { IBinder b = ServiceManager.getService(OPERSYS_SERVICE); IOpersysService service = IOpersysService.Stub.asInterface(b); mOpersysManager = new OpersysManager(service); } } return mOpersysManager;} ?
  • ! : SBEB... /** * Use with {@link #getSystemService} to retrieve a * {@link android.nfc.NfcManager} for using NFC. * * @see #getSystemService */ public static final String NFC_SERVICE = "nfc"; /** The Opersys service **/ public static final String OPERSYS_SERVICE = "opersys";... A
  • !1 C EB B" C SBEBpackage android.os;import android.os.IOpersysServicepublic class OpersysManager{ public void setValue(int value) { try { mService.setValue(value); } catch (RemoteException e) { } } public OpersysManager(IOpersysService service) { mService = service; } IOpersysService mService;} G
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