Using ContentResolver from second application - kotlin

Question

I have created 2 applications: Lets call them A and B. In application A I do have a ContentProvider that I now want to access from application B with a ContentResolver.
However the app craches with the error message:
"E/ActivityThread: Failed to find provider info for com.example.rewardreacher.provider.MyContentProvider"
Here is my application A
DatabaseHandler.kt
package com.example.rewardreacher
import android.annotation.SuppressLint
import android.content.ContentResolver
import android.content.ContentValues
import android.content.Context
import android.database.sqlite.SQLiteDatabase
import android.database.sqlite.SQLiteOpenHelper
import android.widget.Toast
import com.example.rewardreacher.provider.MyContentProvider
import com.example.rewardreacher.provider.MyContentProvider.Companion.CREATE_DB_TABLE
import com.example.rewardreacher.provider.MyContentProvider.Companion.DATABASE_NAME
import com.example.rewardreacher.provider.MyContentProvider.Companion.DATABASE_VERSION
import com.example.rewardreacher.provider.MyContentProvider.Companion.TABLE_NAME
class DatabaseHandler
internal constructor(context: Context?) : SQLiteOpenHelper(
context,
DATABASE_NAME,
null,
DATABASE_VERSION
) {
// creating a table in the database
override fun onCreate(db: SQLiteDatabase) {
db.execSQL(CREATE_DB_TABLE)
}
override fun onUpgrade(
db: SQLiteDatabase,
oldVersion: Int,
newVersion: Int
) {
// sql query to drop a table
// having similar name
db.execSQL("DROP TABLE IF EXISTS $TABLE_NAME")
onCreate(db)
}
}
MyContentProvider.kt
package com.example.rewardreacher.provider
import android.content.ContentProvider
import android.content.ContentUris
import android.content.ContentValues
import android.content.UriMatcher
import android.database.Cursor
import android.database.sqlite.SQLiteDatabase
import android.database.sqlite.SQLiteException
import android.database.sqlite.SQLiteQueryBuilder
import android.net.Uri
import android.text.TextUtils
import com.example.rewardreacher.DatabaseHandler
class MyContentProvider : ContentProvider() {
companion object {
const val AUTHORITY = "com.example.rewardreacher.provider.MyContentProvider"
const val URL = "content://$AUTHORITY/goals"
val CONTENT_URI = Uri.parse(URL)
const val id = "id"
const val name = "name"
const val uriCode = 1
var uriMatcher: UriMatcher? = null
private val values: HashMap<String, String>? = null
// declaring name of the database
const val DATABASE_NAME = "GoalDB"
// declaring table name of the database
const val TABLE_NAME = "Goals"
// declaring version of the database
const val DATABASE_VERSION = 1
// sql query to create the table
const val CREATE_DB_TABLE =
(" CREATE TABLE " + TABLE_NAME
+ " (id INTEGER PRIMARY KEY AUTOINCREMENT, "
+ " name TEXT NOT NULL,"
+ "frequency INTEGER,"
+ "performed INTEGER);")
init {
uriMatcher = UriMatcher(UriMatcher.NO_MATCH)
uriMatcher!!.addURI(
AUTHORITY,
"goals",
uriCode
)
uriMatcher!!.addURI(
AUTHORITY,
"goals/*",
uriCode
)
}
}
override fun getType(uri: Uri): String? {
return when (uriMatcher!!.match(uri)) {
uriCode -> "com.example.rewardreacher.provider.MyContentProvider"
else -> throw IllegalArgumentException("Unsupported URI: $uri")
}
}
override fun onCreate(): Boolean {
val context = context
val dbHelper =
DatabaseHandler(context)
db = dbHelper.writableDatabase
return db != null
}
override fun query(
uri: Uri, projection: Array<String>?, selection: String?,
selectionArgs: Array<String>?, sortOrder: String?
): Cursor? {
var sortOrder = sortOrder
val qb = SQLiteQueryBuilder()
qb.tables = TABLE_NAME
when (uriMatcher!!.match(uri)) {
uriCode -> qb.projectionMap = values
else -> throw IllegalArgumentException("Unknown URI $uri")
}
if (sortOrder == null || sortOrder === "") {
sortOrder = id
}
val c = qb.query(
db, projection, selection, selectionArgs, null,
null, sortOrder
)
c.setNotificationUri(context!!.contentResolver, uri)
return c
}
override fun insert(uri: Uri, values: ContentValues?): Uri? {
val rowID = db!!.insert(TABLE_NAME, "", values)
if (rowID > 0) {
val _uri =
ContentUris.withAppendedId(CONTENT_URI, rowID)
context!!.contentResolver.notifyChange(_uri, null)
return _uri
}
throw SQLiteException("Failed to add a record into $uri")
}
override fun update(
uri: Uri, values: ContentValues?, selection: String?,
selectionArgs: Array<String>?
): Int {
var count = 0
count = when (uriMatcher!!.match(uri)) {
uriCode -> db!!.update(TABLE_NAME, values, selection, selectionArgs)
else -> throw IllegalArgumentException("Unknown URI $uri")
}
context!!.contentResolver.notifyChange(uri, null)
return count
}
override fun delete(
uri: Uri,
selection: String?,
selectionArgs: Array<String>?
): Int {
var count = 0
count = when (uriMatcher!!.match(uri)) {
uriCode -> db!!.delete(TABLE_NAME, selection, selectionArgs)
else -> throw IllegalArgumentException("Unknown URI $uri")
}
context!!.contentResolver.notifyChange(uri, null)
return count
}
private var db: SQLiteDatabase? = null
}
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.rewardreacher">
<permission android:name="com.provider_with_access_to.READ_GOALS"></permission>
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher_reward"
android:label="#string/app_name"
android:roundIcon="#mipmap/ic_launcher_reward_round"
android:supportsRtl="true"
android:theme="#style/Theme.RewardReacher">
<provider
android:name=".provider.MyContentProvider"
android:authorities="com.example.rewardreacher.provider.MyContentProvider"
android:readPermission="com.provider_with_access_to.READ_GOALS"
android:enabled="true"
android:exported="true">
</provider>
<activity
android:name=".MainActivity"
android:exported="true">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
And application B
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.workouttracker">
<uses-permission android:name="com.provider_with_access_to.READ_GOALS" />
<!-- <queries> <package android:name="com.example.rewardreacher.provider.MyContentProvider" /> </queries>-->
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher_workout"
android:label="#string/app_name"
android:roundIcon="#mipmap/ic_launcher_workout_round"
android:supportsRtl="true"
android:theme="#style/Theme.WorkoutTracker">
<activity
android:name=".MainActivity"
android:exported="true">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
MainActivity.kt
package com.example.workouttracker
import android.annotation.SuppressLint
import android.net.Uri
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.View
import android.widget.Button
import android.widget.CheckBox
import android.widget.TextView
import com.google.android.material.textfield.TextInputEditText
class MainActivity : AppCompatActivity() {
var CONTENT_URI = Uri.parse("content://com.example.rewardreacher.provider.MyContentProvider/goals")
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
}
#SuppressLint("Range")
fun onClickShowDetails(view: View?) {
// inserting complete table details in this text field
val resultView = findViewById<View>(R.id.res) as TextView
// creating a cursor object of the
// content URI
val cursor = contentResolver.query(Uri.parse("content://com.example.rewardreacher.provider.MyContentProvider/goals"), null, null, null, null)
// iteration of the cursor
// to print whole table
if (cursor!!.moveToFirst()) {
val strBuild = StringBuilder()
while (!cursor.isAfterLast) {
strBuild.append("""
${cursor.getString(cursor.getColumnIndex("id"))} - ${cursor.getString(cursor.getColumnIndex("name"))} - ${cursor.getString(cursor.getColumnIndex("frequency"))} - ${cursor.getString(cursor.getColumnIndex("performed"))}
""".trimIndent())
cursor.moveToNext()
}
resultView.text = strBuild
} else {
resultView.text = "No Records Found"
}
}