Develop Reference

ClassNotFoundException: org.jacoco.agent.rt.RT

I want to use Jacoco to collect code coverage for manually testing my Android apps. What I did was implement a Broadcast Receiver and ask Jacoco to collect coverage data when receiving the intent. Here is my receiver code:
public class CoverageReceiver extends BroadcastReceiver {
public static String TAG = "JacocoInstrumentation:";
private static final String DEFAULT_COVERAGE_FILE_PATH = "/sdcard/coverage.ec";
private static final boolean LOGD = true;
private String mCoverageFilePath;
#Override
public void onReceive(Context context, Intent intent) {
generateCoverageReport();
}
private void generateCoverageReport() {
if (LOGD)
Log.d(TAG, "generateCoverageReport()");
java.io.File coverageFile = new java.io.File(getCoverageFilePath());
OutputStream out = null;
// We may use this if we want to avoid refecltion and we include
// emma.jar
//RT.dumpCoverageData(coverageFile, false, false);
// Use reflection to call emma dump coverage method, to avoid
// always statically compiling against emma jar
try {
Object agent = Class.forName("org.jacoco.agent.rt.RT")
.getMethod("getAgent")
.invoke(null);
out = new FileOutputStream(coverageFile,false);
out.write((byte[]) agent.getClass().getMethod("getExecutionData", boolean.class)
.invoke(agent, false));
} catch (ClassNotFoundException e) {
reportJacocoError("Jacoco.jar not in the class path?", e);
} catch (SecurityException e) {
reportJacocoError(e);
} catch (NoSuchMethodException e) {
reportJacocoError(e);
} catch (IllegalArgumentException e) {
reportJacocoError(e);
} catch (IllegalAccessException e) {
reportJacocoError(e);
} catch (InvocationTargetException e) {
reportJacocoError(e);
} catch (FileNotFoundException e){
reportJacocoError(e);
} catch (IOException e) {
reportJacocoError(e);
} finally {
if (out != null) {
try {
out.close();
} catch (IOException e) {
reportJacocoError(e);
}
}
}
}
public String getCoverageFilePath() {
if (mCoverageFilePath == null) {
return DEFAULT_COVERAGE_FILE_PATH;
} else {
return mCoverageFilePath;
}
}
public boolean setCoverageFilePath(String filePath){
if(filePath != null && filePath.length() > 0) {
mCoverageFilePath = filePath;
return true;
}
return false;
}
private void reportJacocoError(Exception e) {
reportJacocoError("", e);
}
private void reportJacocoError(String hint, Exception e) {
String msg = "Failed to generate Jacoco coverage. " + hint;
Log.e(TAG, msg, e);
}
}
I also add apply the plugin: 'jacoco' and testCoverageEnabled = true in the Gradle file.
I have seen a few people do this, so it should work. However, when I tried to broadcast the triggering intent and my receiver began to work, I got a ClassNotFoundException:
java.lang.ClassNotFoundException: org.jacoco.agent.rt.RT
...
Caused by: java.lang.ClassNotFoundException: Didn't find class "org.jacoco.agent.rt.RT" on path:
...
Suppressed: java.lang.ClassNotFoundException: org.jacoco.agent.rt.RT
...
Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack trace available
I have tried to specify the Jacoco version, or add Jacoco to the dependencies, but none of that worked. So what should I do?

How to get Advertising id in android?

I used this code it's working when i called from activity and fragment
import com.google.android.gms.ads.identifier.AdvertisingIdClient.Info;
Info adInfo = null;
try {
adInfo = AdvertisingIdClient.getAdvertisingIdInfo(mContext);
} catch (IOException e) {
e.printStackTrace();
} catch (GooglePlayServicesAvailabilityException e) {
e.printStackTrace();
} catch (GooglePlayServicesNotAvailableException e) {
e.printStackTrace();
}
String AdId = adInfo.getId();
But when i called from pending intent like Package Removed then i want to call the web service at that time i need advertising id but i got null.if you people had done previously please suggest me.thanks in advance.

try use app context
as receivers could use activity context or app context - depends who&how started the receiver
AdvertisingIdClient.getAdvertisingIdInfo(context.getApplicationContext());

You can try this code and call the bellow method on onCreate
public void getAAID()
{
AsyncTask.execute(new Runnable() {
#Override
public void run() {
try {
AdvertisingIdClient.Info adInfo = AdvertisingIdClient.getAdvertisingIdInfo(MyActivity.this);
String myId = adInfo != null ? adInfo.getId() : null;
Log.i("UIDMY",myId);
} catch (Exception e) {
Log.e("error", e);
}
}
});
}
Check complete post: how to get AAID programmatically

Accessing a TCP socket from all activities

I want to create a TCP socket when a button is pressed in my first activity and then access that same socket object from any activity (not sure that closing and opening a socket in each activity is a good idea).
I tried quite a few methods having my mind set on a Singleton instance being the best solution to access an object though any activity, my problem is since this is a TCP socket I don't see AsyncTask as the smart idea (can only execute once, defies my point of having one instance of an object) and I don't see how I combine a regular Thread with a singleton.
Singleton code:
public class TCPSingleton extends Application {
private static TCPSingleton singleInstance;
String HostIP;
int tcp_port;
Socket clientSocket;
DataOutputStream outToServer;
public static TCPSingleton getInstance() {
return singleInstance;
}
#Override
public void onCreate() {
super.onCreate();
singleInstance = this;
singleInstance.initializeInstance();
}
protected void initializeInstance() {
this.HostIP = "10.0.0.6";
this.tcp_port = 9871;
try {
this.clientSocket = new Socket(this.HostIP, this.tcp_port);
this.outToServer = new DataOutputStream(clientSocket.getOutputStream());
} catch (UnknownHostException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void send_data(String data){
try {
this.outToServer.writeBytes(data);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
How do I merge a thread here (or what's the better idea other than singleton to do this).

Trouble using reflection with setOverScrollMode

I want to be able to turn off overscroll (the glowing effect when reaching the top or bottom of a page in 2.3+) however I also want my code to run in older versions of android that don't even have overscroll functionality. As per the documentation here: Android Backwards Compatibility I am using reflection in my custom webview class to call setOverScrollMode however everytime I call this on a device running 2.3.4, I get a NoSuchMethodException. Any idea why I can't retrieve this method?
Strangely, if I just call setOverScrollMode without any reflection, it works, so the method is definitely there.
public class MyWebView extends WebView{
public void compatibilitySetOverScroll(){
try {
Method mWebview_SetOverScroll = WebView.class.getMethod("setOverScrollMode", new Class[] { Integer.class } );
/* success, this is a 2.3+ */
if (mWebview_SetOverScroll != null) {
try {
mWebview_SetOverScroll.invoke(this, 2);
} catch (InvocationTargetException ite) {
throw new RuntimeException(ite.getCause());
} catch (IllegalAccessException ie) {
System.err.println("unexpected " + ie);
}
}
} catch (NoSuchMethodException nsme) {
/* failure, must be older device */
}
}
}

Try Integer.TYPE instead of Integer.class

More correct version:
public static void disableOverscroll(View view) {
Class<?> viewCls = view.getClass();
try {
Method m = viewCls.getMethod("setOverScrollMode",
new Class[] { int.class });
int OVER_SCROLL_NEVER = (Integer) viewCls.getField(
"OVER_SCROLL_NEVER").get(view);
m.invoke(view, OVER_SCROLL_NEVER);
} catch (Exception e) {
// swallow
}
}

another way :
try
{
Class<?> myTarget = Class.forName("android.widget.HorizontalScrollView");
Method myMethod = myTarget.getDeclaredMethod("setOverScrollMode", Integer.TYPE);
myMethod.invoke(scrollView, 2);
}
catch (Exception e)
{
e.printStackTrace();
}

How to retrieve the 'last sync' time for an account?

Is it possible to retrieve the time an account was last synchronized, like the system Settings->Accounts&Sync app does? I'm using Android 2.2.
Looking at the 2.2 source for AccountSyncSettings.java, I see the status is retrieved using:
SyncStatusInfo status = ContentResolver.getSyncStatus(account, authority);
but SyncStatusInfo and getSyncStatus don't seem to be part of the public API (marked with #hide). Is there some other way to get at this info?

You can use reflection to achieve this purpose.Here is my code to implement this
private long getLasySyncTime() {
long result = 0;
try {
Method getSyncStatus = ContentResolver.class.getMethod(
"getSyncStatus", Account.class, String.class);
if (mAccount != null && mSyncAdapter != null) {
Object status = getSyncStatus.invoke(null, mAccount,
mSyncAdapter.authority);
Class<?> statusClass = Class
.forName("android.content.SyncStatusInfo");
boolean isStatusObject = statusClass.isInstance(status);
if (isStatusObject) {
Field successTime = statusClass.getField("lastSuccessTime");
result = successTime.getLong(status);
TLog.d(WeixinSetting.class, "get last sync time %d", result);
}
}
} catch (NoSuchMethodException e) {
} catch (IllegalAccessException e) {
} catch (InvocationTargetException e) {
TLog.d(WeixinSetting.class, e.getMessage() + e.getCause().getMessage());
} catch (IllegalArgumentException e) {
} catch (ClassNotFoundException e) {
} catch (NoSuchFieldException e) {
} catch (NullPointerException e) {
}
return result;
}

The Settings app uses ContentResolver.getSyncStatus(account, authority). However, this is not part of the public API. You can use it, but it could break with any future release.