I'm trying to compile an app that utilizes Expo on Android Studio, however, every time I try I get the following error message:
\android\app\src\main\java\com\profileid\MainActivity.java:2: error: class, interface, or enum expected
package com.projectname;
I just upgraded to Expo SDK 43 and migrated from react-native-unimodules.
My MainActivity.java looks like this:
import expo.modules.ReactActivityDelegateWrapper;
package com.projectname;
import android.os.Bundle;
import com.facebook.react.ReactActivity;
import com.facebook.react.ReactActivityDelegate;
import com.facebook.react.ReactRootView;
import com.swmansion.gesturehandler.react.RNGestureHandlerEnabledRootView;
import expo.modules.splashscreen.singletons.SplashScreen;
import expo.modules.splashscreen.SplashScreenImageResizeMode;
public class MainActivity extends ReactActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// SplashScreen.show(...) has to be called after super.onCreate(...)
// Below line is handled by '#expo/configure-splash-screen' command and it's discouraged to modify it manually
SplashScreen.show(this, SplashScreenImageResizeMode.CONTAIN, ReactRootView.class, false);
}
/**
* Returns the name of the main component registered from JavaScript.
* This is used to schedule rendering of the component.
*/
#Override
protected String getMainComponentName() {
return "main";
}
#Override
protected ReactActivityDelegate createReactActivityDelegate() {
return new ReactActivityDelegateWrapper(this, new ReactActivityDelegate(this, getMainComponentName()) {
#Override
protected ReactRootView createRootView() {
return new RNGestureHandlerEnabledRootView(MainActivity.this);
}
});
}
}
Your first import statement and the package statement are out of order. The package statement must be the very first line of your file:
package com.projectname;
import android.os.Bundle;
import com.facebook.react.ReactActivity;
import com.facebook.react.ReactActivityDelegate;
import com.facebook.react.ReactRootView;
import com.swmansion.gesturehandler.react.RNGestureHandlerEnabledRootView;
import expo.modules.ReactActivityDelegateWrapper;
import expo.modules.splashscreen.singletons.SplashScreen;
import expo.modules.splashscreen.SplashScreenImageResizeMode;
Related
I'm writing code for a splash screen as part of a project but when I am trying to use RxJava all the other functions are working fine until I get to 'subscribe' which isn't registering so I'm wondering am I missing a library I didn't import or something?
The error message I get when trying to run is: 'Cannot resolve method 'subscribe'. I've tried asking the tutorial creator, as well as looking at the top relevant questions about the 'subscribe' function on StackOverflow and even looking at the full list of methods in the Completable library but I can't find a solution so I'm really desperate, please help
These are my dependencies:
implementation 'io.reactivex.rxjava2:rxandroid:2.1.1'
implementation 'io.reactivex.rxjava2:rxjava:2.2.20'
My Code:
package codebymech.fyprideshareapp;
import androidx.appcompat.app.AppCompatActivity;
import android.app.Notification;
import android.os.Bundle;
import android.widget.Toast;
import java.util.concurrent.TimeUnit;
import io.reactivex.Completable;
import io.reactivex.android.schedulers.AndroidSchedulers;
import io.reactivex.functions.Action;
public class Activity_SplashScreen extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
delay_Splash();
}
private void delay_Splash() {
Completable.timer(delay: 5, TimeUnit.SECONDS,
AndroidSchedulers.mainThread())
.subscribe(new Action() {
#Override
public void run() throws Exception {
Toast.makeText(Activity_SplashScreen.this, "!! Splash Screen Finished", Toast.LENGTH_SHORT).show();
}
});
}
}
Part of tutorial where the code is from:
https://youtu.be/144TuYxEu2M?t=489
You have to remove delay: . This is not possible in Java. If you look at the video, you see a delay: in given method, but it is added by the IDE (IntelliJ) in order to give you a hint, which parameter you are currently editing.
Import
import io.reactivex.Completable;
import io.reactivex.functions.Action;
import io.reactivex.schedulers.Schedulers;
Java8
Completable.timer(5, TimeUnit.SECONDS,
Schedulers.trampoline())
.subscribe(() -> {
System.out.println("x");
});
Java7
Completable.timer(5, TimeUnit.SECONDS,
Schedulers.trampoline())
.subscribe(new Action() {
#Override
public void run() throws Exception {
System.out.println("x");
}
});
Trying to create native module for react-native. I have all the dependencies needed and I followed the instructions user com mobile sdk installation
in project/android/build.gradle
allprojects {
repositories {
…
maven {
url 'https://android-sdk.user.com'
}
}
}
in project/android/app/build.gradle
dependencies {
implementation 'com.user:android-sdk:1.0.0'
}
then i created file in project/app/src/main/java/com/my_app/UserComModule.java
package com.my_app;
import com.facebook.react.bridge.NativeModule;
import com.facebook.react.bridge.ReactApplicationContext;
import com.facebook.react.bridge.ReactContext;
import com.facebook.react.bridge.ReactContextBaseJavaModule;
import com.facebook.react.bridge.ReactMethod;
import java.util.Map;
import java.util.HashMap;
import com.user.UserCom;
public class UserComModule extends ReactContextBaseJavaModule {
private static ReactApplicationContext reactContext;
#Override
public void onCreate() {
super.onCreate();
new UserCom.Builder(
this,
"api_secret", //your api secret key generated in User.com webpanel details
"https://<your_app_subdomain>.user.com"
)
.trackAllActivities(true) // false by default
.openLinksInChromeCustomTabs(true) // true by default
.setCustomTabsBuilder(getCustomTabsBuilder())
.build();
}
}
When i run i get: cannot find symbol import com.user.UserCom;
You're importing UserCom, and that module is not availabe, as you've mentioned you had created the file UserComModule in that directory, either create UserCom class or delete this line from UserComModule
import com.user.UserCom;
I am new to Corda and started with the provided tutorials.
In two different tutorials I ran into the same problem. The functions requireThat() and requireSingleCommand() are undefined.
Below you see my code from the "HelloWorld! Pt. 2" tutorial.
The requireThat() function produces the following error:
The method requireThat((<no type> require) -> {}) is undefined for the type SignTxFlow Java(67108964)
Although, the requireThat() function is part of the net.corda.core.contracts package which is included in the code.
Thank you for your help!
package com.template.flows;
import com.template.states.IOUState;
import co.paralleluniverse.fibers.Suspendable;
import net.corda.core.contracts.ContractState;
import net.corda.core.crypto.SecureHash;
import net.corda.core.flows.FlowException;
import net.corda.core.flows.FlowLogic;
import net.corda.core.flows.FlowSession;
import net.corda.core.flows.InitiatedBy;
import net.corda.core.flows.ReceiveFinalityFlow;
import net.corda.core.flows.SignTransactionFlow;
import net.corda.core.transactions.SignedTransaction;
import net.corda.core.contracts.*;
import net.corda.core.flows.*;
import net.corda.core.contracts.Command;
import net.corda.core.transactions.*;
import net.corda.core.utilities.ProgressTracker;
// ******************
// * Responder flow *
// ******************
#InitiatedBy(IOUFlow.class)
public class IOUFlowResponder extends FlowLogic<Void> {
private FlowSession otherPartySession;
public IOUFlowResponder(FlowSession otherPartySession) {
this.otherPartySession = otherPartySession;
}
#Suspendable
#Override
public Void call() throws FlowException {
class SignTxFlow extends SignTransactionFlow {
private SignTxFlow(FlowSession otherPartySession) {
super(otherPartySession);
}
#Override
protected void checkTransaction(SignedTransaction stx) {
requireThat(require -> {
ContractState output = stx.getTx().getOutputs().get(0).getData();
require.using("this must be an IOU transaction. ", output instanceof IOUState);
IOUState iou = (IOUState) output;
require.using("The IOU's value can't be too high.", iou.getValue() < 100);
return null;
});
}
}
SecureHash expectedTxId = subFlow(new SignTxFlow(otherPartySession)).getId();
subFlow(new ReceiveFinalityFlow(otherPartySession, expectedTxId));
return null;
}
}
The problem is solved, if the package
import static net.corda.core.contracts.ContractsDSL.requireThat;
is implemented at the top.
I am trying to create a code which will convert images into video. I have surfed a lot and find some method to do it using javacv. now i am getting variable not found error in these lines.
recorder.setCodecID( CODEC_ID_MPEG1VIDEO);
recorder.setPixelFormat( PIX_FMT_YUV420P);
I have imported all the jar files into my library as well but still getting this error. Some quick help would be appreciated. I have gone through the below link for the importing the javacv into my workspace.
How to Import JavaCV libraries to Android Project
package com.example.photoaday;
import static com.googlecode.javacv.cpp.opencv_core.cvReleaseImage;
import static com.googlecode.javacv.cpp.opencv_highgui.cvLoadImage;
import static com.googlecode.javacv.cpp.opencv_highgui.cvShowImage;
import static com.googlecode.javacv.cpp.opencv_highgui.cvWaitKey;
import static com.googlecode.javacv.cpp.opencv_imgproc.CV_GAUSSIAN;
import static com.googlecode.javacv.cpp.opencv_imgproc.cvSmooth;
import com.googlecode.javacv.FFmpegFrameRecorder;
import com.googlecode.javacv.cpp.opencv_core;
import com.googlecode.javacv.cpp.opencv_core.IplImage;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
public class Recordvideo extends Activity {
// #Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.create);
opencv_core.IplImage img = cvLoadImage("/sdcard/folder/img1.jpg");
FFmpegFrameRecorder recorder = new FFmpegFrameRecorder("/sdcard/folder/test.mpeg",200,150);
try {
recorder.setCodecID( CODEC_ID_MPEG1VIDEO);
recorder.setFrameRate(30);
recorder.setPixelFormat( PIX_FMT_YUV420P);
recorder.start();
for (int i=0;i<100;i++)
{
recorder.record(img);
}
recorder.stop();
}
catch (Exception e){
e.printStackTrace();
}
}
}
I assume that your compiler gives error as follows
error: ‘CODEC_ID_MPEG1VIDEO’ was not declared in this scope
error: ‘PIX_FMT_YUV420P’ was not declared in this scope
then solution for error is
change : ‘CODEC_ID_MPEG1VIDEO’ to 'AV_CODEC_ID_MPEG1VIDEO'
change : ‘PIX_FMT_YUV420P’ to 'AV_PIX_FMT_YUV420P'
I tried to run an android project in Cordova with self-build plugin,
Heres the code in JS and java for the plugin
var cordova = require('cordova');
var Carrier = function() {};
Carrier.prototype.getCarrierCode = function(success, error) {
cordova.exec(success, error, 'CarrierPlugin', 'getCarrierCode', []);
};
var carrier = new Carrier();
module.exports = carrier;
this is the java code:
import org.apache.cordova.CordovaPlugin;
import org.apache.cordova.CallbackContext;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.Date;
import android.app.Activity;
import android.database.Cursor;
import android.os.Bundle;
import android.provider.CallLog;
import android.content.ContentResolver;
public class CarrierPlugin extends CordovaPlugin{
public static final String TAG = "CarrierPlugin";
public static final String ACTION_GET_CARRIER_CODE = "getCarrierCode";
//public TelephonyManager tm;
#Override
public void initialize(CordovaInterface cordova, CordovaWebView webView) {
// TODO Auto-generated method stub
super.initialize(cordova, webView);
}
#Override
public boolean execute(String action, CordovaArgs args,
CallbackContext callbackContext) throws JSONException{
callbackContext.success("run it");
return true;
}
}
the error I got is "cannot find symbol :"
the strange thing is that, even if I change the code in the CarrierPlugin.java(delete the JSONException in line 16), it reported the same error.
My Eclipse says, you should import CordovaInterface, CordovaWebView and CordovaArgs.
And you might be missing package declaration as well, depending wherever you want to put your plugin's java files, such as:
package com.yourdomain.etc in the very first line of your Java file.