Content Provider 1

activity_main.xml


<?xml version="1.0" encoding="utf-8"?>
<AbsoluteLayout
 xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 tools:context=".MainActivity"
 tools:ignore="Deprecated">
 <EditText
android:id="@+id/idDate"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:layout_x="16dp"
 android:layout_y="16dp"
 android:ems="10"
 android:hint="Enter today's date"/>
 <EditText
 android:id="@+id/idNote"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:layout_x="16dp"
 android:layout_y="61dp"
 android:ems="10"
 android:hint="Enter note content"/>
 <Button
 android:id="@+id/idAdd"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:layout_x="16dp"
 android:layout_y="106dp"
 android:text="Add Note"/>
</AbsoluteLayout>


MainActivity.java


package com.example.program4a;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;
import android.widget.Button;
import android.widget.EditText;
import android.content.ContentValues;
import androidx.appcompat.app.AppCompatActivity;
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
 EditText date, note;
 Button add;
 @Override
 protected void onCreate(Bundle b) {
 super.onCreate(b);
 setContentView(R.layout.activity_main);
 date = findViewById(R.id.idDate);
 note = findViewById(R.id.idNote);
 add = findViewById(R.id.idAdd);
 add.setOnClickListener(this);
 }
 @Override
 public void onClick(View v) {
 if(v.equals(add)){
 String dateText = date.getText().toString();
 String noteText = note.getText().toString();
 ContentValues cv = new ContentValues();
 cv.put("date", dateText);
 cv.put("note", noteText);
 getContentResolver().insert(NotesProvider.CONTENT_URI, cv);
 Toast.makeText(this, "Note added", Toast.LENGTH_SHORT).show();
 }
 }
}




NotesProvider.java

package com.example.program4a;
import android.net.Uri;
import android.database.Cursor;
import android.content.ContentValues;
import android.content.ContentProvider;
import android.database.sqlite.SQLiteDatabase;
public class NotesProvider extends ContentProvider {
 static String AUTHORITY = "com.example.notesprovider";
 static String BASE_PATH = "notes";
 static Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/" + BASE_PATH);
 ProviderDatabase dbHelper;
 SQLiteDatabase db;
 @Override
 public boolean onCreate() {
 dbHelper = new ProviderDatabase(getContext(), ProviderDatabase.DATABASE_NAME, null, 1);
 return (dbHelper == null) ? false : true;
 }
 @Override
 public Cursor query(Uri uri, String[] strings, String s, String[] strings1, String s1) {
 db = dbHelper.getReadableDatabase();
 Cursor c = db.query(ProviderDatabase.TABLE_NAME, strings, s, strings1, null, null, null);
 return c;
 }
 @Override
 public String getType(Uri uri) {
 return null;
 }
 @Override
 public Uri insert(Uri uri, ContentValues cv) {
 db = dbHelper.getWritableDatabase();
 db.insert(ProviderDatabase.TABLE_NAME, null, cv);
 db.close();
 return null;
 }
 @Override
 public int delete(Uri uri, String s, String[] strings) {
 return 0;
 }
@Override
 public int update(Uri uri, ContentValues cv, String s, String[] strings) {
 return 0;
 }
}



ProviderDatabase.java

package com.example.program4a;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
public class ProviderDatabase extends SQLiteOpenHelper {
 public static String DATABASE_NAME = "notes.db";
 public static String TABLE_NAME = "notes";
 public ProviderDatabase(Context context, String name, SQLiteDatabase.CursorFactory factory, int version) {
 super(context, name, factory, version);
 }
 @Override
 public void onCreate(SQLiteDatabase db) {
 db.execSQL("CREATE TABLE " + TABLE_NAME + " (date TEXT, note TEXT);");
 }
 @Override
 public void onUpgrade(SQLiteDatabase db, int i, int i1) {
 }
}
<provider
 android:authorities="com.example.notesprovider"
 android:name=".NotesProvider"
 android:exported="true"
 android:enabled="true"/>