Exp.
19
#activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:padding="16dp">
<EditText
android:id="@+id/nameEditText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Name" />
<EditText
android:id="@+id/phoneEditText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Phone" />
<Button
android:id="@+id/insertButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Insert Contact" />
<Button
android:id="@+id/queryButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Query Contacts" />
<TextView
android:id="@+id/resultTextView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Results will be displayed here"
android:paddingTop="16dp" />
</LinearLayout>
#MainActivity.java
package com.example.contentproviderdemo;
import android.content.ContentValues;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import androidx.appcompat.app.AppCompatActivity;
public class MainActivity extends AppCompatActivity {
private EditText nameEditText, phoneEditText;
private TextView resultTextView;
private static final Uri CONTENT_URI =
Uri.parse("content://com.example.contentproviderdemo.provider/contacts");
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
nameEditText = findViewById(R.id.nameEditText);
phoneEditText = findViewById(R.id.phoneEditText);
resultTextView = findViewById(R.id.resultTextView);
Button insertButton = findViewById(R.id.insertButton);
Button queryButton = findViewById(R.id.queryButton);
// Insert data into the content provider
insertButton.setOnClickListener(v -> {
String name = nameEditText.getText().toString();
String phone = phoneEditText.getText().toString();
ContentValues values = new ContentValues();
values.put(ContactsDatabaseHelper.COLUMN_NAME, name);
values.put(ContactsDatabaseHelper.COLUMN_PHONE, phone);
Uri newContactUri = getContentResolver().insert(CONTENT_URI, values);
resultTextView.setText("Inserted: " + newContactUri.toString());
});
// Query data from the content provider
queryButton.setOnClickListener(v -> {
Cursor cursor = getContentResolver().query(CONTENT_URI, null, null, null, null);
StringBuilder result = new StringBuilder();
if (cursor != null && cursor.moveToFirst()) {
do {
String name =
cursor.getString(cursor.getColumnIndex(ContactsDatabaseHelper.COLUMN_NAME));
String phone =
cursor.getString(cursor.getColumnIndex(ContactsDatabaseHelper.COLUMN_PHONE));
result.append("Name: ").append(name).append(", Phone: ").append(phone).append("\n");
} while (cursor.moveToNext());
cursor.close();
resultTextView.setText(result.toString());
});
}
#output
