Practical 19
ActivityMain.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#168BC34A"
tools:context=".MainActivity">
<LinearLayout
android:id="@+id/linearLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:orientation="vertical"
app:layout_constraintBottom_toTopOf="@+id/imageView"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.13"
tools:ignore="MissingConstraints">
<TextView
android:id="@+id/textView1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="40dp"
android:layout_marginBottom="70dp"
android:text="@string/heading"
android:textAlignment="center"
android:textAppearance="@style/TextAppearance.AppCompat.Large"
android:textColor="@android:color/holo_green_dark"
android:textSize="36sp"
android:textStyle="bold" />
<EditText
android:id="@+id/textName"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginStart="20dp"
android:layout_marginEnd="20dp"
android:layout_marginBottom="40dp"
android:hint="@string/hintText" />
<Button
android:id="@+id/insertButton"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginStart="20dp"
android:layout_marginTop="10dp"
android:layout_marginEnd="20dp"
android:layout_marginBottom="20dp"
android:background="#4CAF50"
android:onClick="onClickAddDetails"
android:text="@string/insertButtontext"
android:textAlignment="center"
android:textAppearance="@style/TextAppearance.AppCompat.Display1"
android:textColor="#FFFFFF"
android:textStyle="bold" />
<Button
android:id="@+id/loadButton"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginStart="20dp"
android:layout_marginTop="10dp"
android:layout_marginEnd="20dp"
android:layout_marginBottom="20dp"
android:background="#4CAF50"
android:onClick="onClickShowDetails"
android:text="@string/loadButtonText"
android:textAlignment="center"
android:textAppearance="@style/TextAppearance.AppCompat.Display1"
android:textColor="#FFFFFF"
android:textStyle="bold" />
<TextView
android:id="@+id/res"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginStart="20dp"
android:layout_marginEnd="20dp"
android:clickable="false"
android:ems="10"
android:textColor="@android:color/holo_green_dark"
android:textSize="18sp"
android:textStyle="bold" />
</LinearLayout>
<ImageView
android:id="@+id/imageView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:srcCompat="@drawable/ic_launcher_background" />
</androidx.constraintlayout.widget.ConstraintLayout>
MainActivity.java
package com.example.contentprovider1;
import androidx.appcompat.app.AppCompatActivity;
import android.annotation.SuppressLint;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.view.inputmethod.InputMethodManager;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
InputMethodManager imm =
(InputMethodManager)getSystemService(Context.INPUT_METHOD_SERVICE);
imm.hideSoftInputFromWindow(getCurrentFocus().getWindowToken(), 0);
return true;
}
public void onClickAddDetails(View view) {
// class to add values in the database
ContentValues values = new ContentValues();
// fetching text from user
values.put(MyContentProvider.name, ((EditText) findViewById(R.id.textName)).getText().toString());
// inserting into database through content URI
getContentResolver().insert(MyContentProvider.CONTENT_URI, values);
// displaying a toast message
Toast.makeText(getBaseContext(), "New Record Inserted", Toast.LENGTH_LONG).show();
}
@SuppressLint("Range")
public void onClickShowDetails(View view) {
// inserting complete table details in this text field
TextView resultView= (TextView) findViewById(R.id.res);
// creating a cursor object of the
// content URI
Cursor cursor = getContentResolver().query(Uri.parse("content://com.demo.user.provider/users"),
null, null, null, null);
// iteration of the cursor
// to print whole table
if(cursor.moveToFirst()) {
StringBuilder strBuild=new StringBuilder();
while (!cursor.isAfterLast()) {
strBuild.append("\n"+cursor.getString(cursor.getColumnIndex("id"))+ "-"+
cursor.getString(cursor.getColumnIndex("name")));
cursor.moveToNext();
}
resultView.setText(strBuild);
}
else {
resultView.setText("No Records Found");
}
}
}
MyContentProvider.java
package com.example.contentprovider1;
import android.content.ContentProvider;
import android.content.ContentUris;
import android.content.ContentValues;
import android.content.Context;
import android.content.UriMatcher;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteException;
import android.database.sqlite.SQLiteOpenHelper;
import android.database.sqlite.SQLiteQueryBuilder;
import android.net.Uri;
import androidx.annotation.NonNull;
import java.util.HashMap;
import java.util.Objects;
public class MyContentProvider extends ContentProvider {
public MyContentProvider() {
}
// defining authority so that other application can access it
static final String PROVIDER_NAME = "com.demo.user.provider";
// defining content URI
static final String URL = "content://" + PROVIDER_NAME + "/users";
// parsing the content URI
static final Uri CONTENT_URI = Uri.parse(URL);
static final String id = "id";
static final String name = "name";
static final int uriCode = 1;
static final UriMatcher uriMatcher;
private static HashMap<String, String> values;
static {
// to match the content URI
// every time user access table under content provider
uriMatcher = new UriMatcher(UriMatcher.NO_MATCH);
// to access whole table
uriMatcher.addURI(PROVIDER_NAME, "users", uriCode);
// to access a particular row
// of the table
uriMatcher.addURI(PROVIDER_NAME, "users/*", uriCode);
}
@Override
public String getType(@NonNull Uri uri) {
if (uriMatcher.match(uri) == uriCode) {
return "vnd.android.cursor.dir/users";
}
throw new IllegalArgumentException("Unsupported URI: " + uri);
}
// creating the database
@Override
public boolean onCreate() {
Context context = getContext();
DatabaseHelper dbHelper = new DatabaseHelper(context);
db = dbHelper.getWritableDatabase();
return db != null;
}
@Override
public Cursor query(@NonNull Uri uri, String[] projection, String selection,
String[] selectionArgs, String sortOrder) {
SQLiteQueryBuilder qb = new SQLiteQueryBuilder();
qb.setTables(TABLE_NAME);
if (uriMatcher.match(uri) == uriCode) {
qb.setProjectionMap(values);
} else {
throw new IllegalArgumentException("Unknown URI " + uri);
}
if (sortOrder == null || sortOrder.equals("")) {
sortOrder = id;
}
Cursor c = qb.query(db, projection, selection, selectionArgs, null,
null, sortOrder);
c.setNotificationUri(Objects.requireNonNull(getContext()).getContentResolver(), uri);
return c;
}
// adding data to the database
@Override
public Uri insert(@NonNull Uri uri, ContentValues values) {
long rowID = db.insert(TABLE_NAME, "", values);
if (rowID > 0) {
Uri _uri = ContentUris.withAppendedId(CONTENT_URI, rowID);
Objects.requireNonNull(getContext()).getContentResolver().notifyChange(_uri, null);
return _uri;
}
throw new SQLiteException("Failed to add a record into " + uri);
}
@Override
public int update(Uri uri, ContentValues values, String selection,
String[] selectionArgs) {
int count = 0;
switch (uriMatcher.match(uri)) {
case uriCode:
count = db.update(TABLE_NAME, values, selection, selectionArgs);
break;
default:
throw new IllegalArgumentException("Unknown URI " + uri);
}
getContext().getContentResolver().notifyChange(uri, null);
return count;
}
@Override
public int delete(Uri uri, String selection, String[] selectionArgs) {
int count = 0;
switch (uriMatcher.match(uri)) {
case uriCode:
count = db.delete(TABLE_NAME, selection, selectionArgs);
break;
default:
throw new IllegalArgumentException("Unknown URI " + uri);
}
getContext().getContentResolver().notifyChange(uri, null);
return count;
}
// creating object of database
// to perform query
private SQLiteDatabase db;
// declaring name of the database
static final String DATABASE_NAME = "UserDB";
// declaring table name of the database
static final String TABLE_NAME = "Users";
// declaring version of the database
static final int DATABASE_VERSION = 1;
// sql query to create the table
static final String CREATE_DB_TABLE = " CREATE TABLE " + TABLE_NAME
+ " (id INTEGER PRIMARY KEY AUTOINCREMENT, "
+ " name TEXT NOT NULL);";
// creating a database
private static class DatabaseHelper extends SQLiteOpenHelper {
// defining a constructor
DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
// creating a table in the database
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL(CREATE_DB_TABLE);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// sql query to drop a table
// having similar name
db.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME);
onCreate(db);
}
}
}
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
package="com.example.contentprovider1">
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"
android:maxSdkVersion="32" />
<!-- Add other necessary permissions here -->
<application
android:allowBackup="true"
android:dataExtractionRules="@xml/data_extraction_rules"
android:fullBackupContent="@xml/backup_rules"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/Theme.ContentProvider1"
tools:targetApi="31">
<provider
android:name="com.example.contentprovider1.MyContentProvider"
android:authorities="com.demo.user.provider"
android:enabled="true"
android:exported="true" />
<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>
