kotlin-android-extensions

问题 I have a Kotlin class which just declare some methods for interaction of Kotlin and C/C++ : class JNILib { companion object { external fun getAppId(): String init { System.loadLibrary("native-code") } } } But I have a problem when declaring the native method. I tried extern "C" JNIEXPORT jstring JNICALL Java_com_package_JNILib_getAppId( JNIEnv *env, jobject /* this */){ // wrong } extern "C" JNIEXPORT jstring JNICALL Java_com_package_JNILib_Companion_getAppId( JNIEnv *env, jobject /* this */)

问题 I have a Kotlin class which just declare some methods for interaction of Kotlin and C/C++ : class JNILib { companion object { external fun getAppId(): String init { System.loadLibrary("native-code") } } } But I have a problem when declaring the native method. I tried extern "C" JNIEXPORT jstring JNICALL Java_com_package_JNILib_getAppId( JNIEnv *env, jobject /* this */){ // wrong } extern "C" JNIEXPORT jstring JNICALL Java_com_package_JNILib_Companion_getAppId( JNIEnv *env, jobject /* this */)

问题 I have a Kotlin class which just declare some methods for interaction of Kotlin and C/C++ : class JNILib { companion object { external fun getAppId(): String init { System.loadLibrary("native-code") } } } But I have a problem when declaring the native method. I tried extern "C" JNIEXPORT jstring JNICALL Java_com_package_JNILib_getAppId( JNIEnv *env, jobject /* this */){ // wrong } extern "C" JNIEXPORT jstring JNICALL Java_com_package_JNILib_Companion_getAppId( JNIEnv *env, jobject /* this */)

问题 I am trying to change my sqlite database with room library. I am little confuse with left join query. I have implemented it with sqlite, but don't know how can I achieve same withh room? Here is my table creation: first table: Notification db.execSQL("CREATE TABLE IF NOT EXISTS $TABLE_NAME ($COLUMN_ID INTEGER PRIMARY KEY, $ICON TEXT, $TITLE INTEGER," + " $DATE INTEGER, $TYPE INTEGER,$URL TEXT, $MESSAGE INTEGER, FOREIGN KEY($TITLE) REFERENCES ${TableNotificationsTrans.getTableName(this)}(id),"

问题 I am trying to change my sqlite database with room library. I am little confuse with left join query. I have implemented it with sqlite, but don't know how can I achieve same withh room? Here is my table creation: first table: Notification db.execSQL("CREATE TABLE IF NOT EXISTS $TABLE_NAME ($COLUMN_ID INTEGER PRIMARY KEY, $ICON TEXT, $TITLE INTEGER," + " $DATE INTEGER, $TYPE INTEGER,$URL TEXT, $MESSAGE INTEGER, FOREIGN KEY($TITLE) REFERENCES ${TableNotificationsTrans.getTableName(this)}(id),"

问题 I am trying to change my sqlite database with room library. I am little confuse with left join query. I have implemented it with sqlite, but don't know how can I achieve same withh room? Here is my table creation: first table: Notification db.execSQL("CREATE TABLE IF NOT EXISTS $TABLE_NAME ($COLUMN_ID INTEGER PRIMARY KEY, $ICON TEXT, $TITLE INTEGER," + " $DATE INTEGER, $TYPE INTEGER,$URL TEXT, $MESSAGE INTEGER, FOREIGN KEY($TITLE) REFERENCES ${TableNotificationsTrans.getTableName(this)}(id),"

问题 I want to initialize ViewModel in Activity using androidx library I have tried what documentation says but it is not working. the ".of" is not resolved. import androidx.appcompat.app.AppCompatActivity import android.os.Bundle import androidx.databinding.DataBindingUtil import androidx.lifecycle.ViewModelProvider import com.example.myapplication.databinding.ActivityMainBinding class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate

问题 I am trying to remove all non alphanumeric characters from a string. I tried using replace() with a regex as followed: var answer = answerEditText.text.toString() Log.d("debug", answer) answer = answer.replace("[^A-Za-z0-9 ]", "").toLowerCase() Log.d("debug", answer) D/debug: Test. ,replace D/debug: test. ,replace Why are the punctuation characters still present? How to get only the alphanumeric characters? 回答1: You need to create a regex object var answer = "Test. ,replace" println(answer)

问题 How to show a slow internet connection to the user when the network is connected Note: Not a network type (2G,3G,4G, WIFI) 回答1: Determining your Network Speed - (Slow Internet Speed) Using NetworkInfo class, ConnectivityManager and TelephonyManager to determine your Network Type. Download any file from the internet & calculate how long it took vs number of bytes in the file. ( Only possible way to determine Speed Check ) I have tried the below Logic for my projects, You have also look into

问题 I want to implement android 10 dark theme in my app , I have these following cases: SYSTEM_DEFAULT, NIGHT_MODE, LIGHT_MODE The problem is when I change theme from night or light to system_default from inside the app and it can not understand whether the system is in light mode or dark mode. so the theme won't be updated. I've tried the dark theme by google https://developer.android.com/guide/topics/ui/look-and-feel/darktheme and implementing the configuration still won't be good for me