Android emulator call log generator for developers.

CallLogGeneratorActivity.java

import android.content.ContentResolver;
import android.content.ContentValues;
import android.os.Bundle;
import android.provider.CallLog;
import android.support.v7.app.AppCompatActivity;

import java.sql.Timestamp;
import java.util.Date;
import java.util.Random;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_call_log_generator);
        final Random random = new Random();
        phoneNumberGenerator(150, random);
    }

    public void phoneNumberGenerator(int count, Random random) {
        int num1, num2, num3;
        int set2, set3;
        for (int i = 0; i < count; i++) {

            num1 = random.nextInt(7) + 1;
            num2 = random.nextInt(8);
            num3 = random.nextInt(8);

            set2 = random.nextInt(643) + 100;

            set3 = random.nextInt(8999) + 1000;

            insertPlaceholderCall(getContentResolver(), "+" + num1 + num2 + num3 + set2 + set3, random);
        }
    }

    public void insertPlaceholderCall(ContentResolver contentResolver, String number, Random random) {
        ContentValues values = new ContentValues();
        values.put(CallLog.Calls.NUMBER, number);
        values.put(CallLog.Calls.DATE, dateGenerator());
        values.put(CallLog.Calls.DURATION, random.nextInt(3600));
        values.put(CallLog.Calls.TYPE, random.nextInt(3) + 1);
        values.put(CallLog.Calls.NEW, 1);
        contentResolver.insert(CallLog.Calls.CONTENT_URI, values);
    }

    public long dateGenerator() {
        long offset = Timestamp.valueOf("2016-01-01 00:00:00").getTime();
        long end = new Date().getTime();
        long diff = end - offset + 1;
        Timestamp rand = new Timestamp(offset + (long) (Math.random() * diff));
        return rand.getTime();
    }
}