Karim Yaghmour's "Embedded Android Workshop" from the Embedded Linux Conference 2012

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package 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);
}

121. 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, don't crash!
Log.e(TAG, "Exception in OpersysWorkerHandler.handleMessage:", e);
}
}
}
}

122. > 71 C CE BA
package android.os;
interface IOpersysService {
/**
* {@hide}
*/
void setValue(int val);
}

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try {
Slog.i(TAG, "Opersys Service");
ServiceManager.addService(“opersys”, new OpersysService(context));
} catch (Throwable e) {
Slog.e(TAG, "Failure starting OpersysService Service", e);
}
...
<

125. >> = CE C QBEB
package 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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128. B F87
public 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

129. F87
jstring
Java_com_example_hellojni_HelloJni_stringFromJNI( JNIEnv* env,
jobject thiz )
{
return (*env)->NewStringUTF(env, "Hello from JNI !");
}
;

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132. B AC A [
accessibilityservice content hardware pim speech
accounts database inputmethodservice preference test
annotation ddm net provider text
app debug nfc security util
appwidget emoji os server view
bluetooth gesture service webkit widget

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135. B ! : 7D QBEB
...
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();
}
...
>

136. 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;
}
?

137. ! : QBEB
...
/**
* 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

138. !1 C EB B" C QBEB
package android.os;
import android.os.IOpersysService
public 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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152. ) / BA B A : CB K`%(F(11 a!F A
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$ cd crosstool-ng-1.10.0/
$ ./configure
6 AB A B C "
$ make
$ make install
" C C
$ cd ${PRJROOT}/build-tools
$ ct-ng menuconfig
>

153. Options:
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$ ct-ng build
>

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