Implementing Android Intents and Content Providers

Posted on May 17, 2026 in Computers

MainActivity.java

package com.example.lab4;

import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.view.View;
import android.widget.Button;
import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {
    Button btnExplicit, btnImplicit, btnContacts;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // Initialize buttons
        btnExplicit = findViewById(R.id.button_open_explicit);
        btnImplicit = findViewById(R.id.button_open_implicit);
        btnContacts = findViewById(R.id.button_open_contacts);

        // 1. Explicit Intent
        btnExplicit.setOnClickListener(v -> {
            Intent intent = new Intent(MainActivity.this, SecondActivity.class);
            startActivity(intent);
        });

        // 2. Implicit Intent (Open Browser)
        btnImplicit.setOnClickListener(v -> {
            Intent intent = new Intent(Intent.ACTION_VIEW);
            intent.setData(Uri.parse("https://www.google.com"));
            startActivity(intent);
        });

        // 3. Content Provider (Open Contacts)
        btnContacts.setOnClickListener(v -> {
            Intent intent = new Intent(Intent.ACTION_PICK,
                    ContactsContract.CommonDataKinds.Phone.CONTENT_URI);
            startActivity(intent);
        });
    }
}

activity_main.xml

(Layout XML content goes here)

SecondActivity.java

package com.example.lab4;

import android.os.Bundle;
import androidx.appcompat.app.AppCompatActivity;

public class SecondActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_second);
    }
}

activity_second.xml

(Layout XML content goes here)

AndroidManifest.xml

(Manifest configuration goes here)