AlarmManager trigger BroadcastReceiver, then start another activity to generate Ringtone

This example show how to choice date/time with DatePicker and TimePicker, then set AlarmManager to trigger BroadcastReceiver on specified date/time, then start another activity to generate Ringtone using RingtoneManager.

com.example.androidringtone.MainActivity.java

package com.example.androidringtone;

import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.media.Ringtone;
import android.media.RingtoneManager;
import android.net.Uri;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.RadioButton;
import android.widget.TextView;
import android.widget.TimePicker;
import android.widget.Toast;

import java.util.Calendar;

public class MainActivity extends ActionBarActivity {

    DatePicker datePicker;
    TimePicker timePicker;

    RadioButton optAlarm, optNotification, optRingtone;
    RadioButton optRingTonePicker;
    Button btnStart;
    TextView info;

    Ringtone ringTone;

    Uri uriAlarm, uriNotification, uriRingtone;

    final static int RQS_RINGTONEPICKER = 1;

    final static int RQS_1 = 1;

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

        datePicker = (DatePicker)findViewById(R.id.datepicker);
        timePicker = (TimePicker)findViewById(R.id.timepicker);

        optAlarm = (RadioButton)findViewById(R.id.optAlarm);
        optNotification = (RadioButton)findViewById(R.id.optNotification);
        optRingtone = (RadioButton)findViewById(R.id.optRingtone);
        optRingTonePicker = (RadioButton)findViewById(R.id.optPicker);
        btnStart = (Button)findViewById(R.id.start);
        info = (TextView)findViewById(R.id.info);

        uriAlarm = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_ALARM);
        uriNotification = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
        uriRingtone = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_RINGTONE);
        optAlarm.setText("uriAlarm: " + uriAlarm);
        optNotification.setText("uriNotification: " + uriNotification);
        optRingtone.setText("uriRingtone: " + uriRingtone);

        btnStart.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {

                if (optAlarm.isChecked()) {
                    setAlarm(uriAlarm);
                } else if (optNotification.isChecked()) {
                    setAlarm(uriNotification);
                } else if (optRingtone.isChecked()) {
                    setAlarm(uriRingtone);
                } else if (optRingTonePicker.isChecked()) {
                    startRingTonePicker();
                }

            }
        });

    }

    private void startRingTonePicker(){
        Intent intent = new Intent(RingtoneManager.ACTION_RINGTONE_PICKER);
        startActivityForResult(intent, RQS_RINGTONEPICKER);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if(requestCode == RQS_RINGTONEPICKER && resultCode == RESULT_OK){
            Uri uri = data.getParcelableExtra(RingtoneManager.EXTRA_RINGTONE_PICKED_URI);
            setAlarm(uri);
        }
    }

    private void setAlarm(Uri passuri){

        Calendar cal = Calendar.getInstance();
        cal.set(datePicker.getYear(),
                datePicker.getMonth(),
                datePicker.getDayOfMonth(),
                timePicker.getCurrentHour(),
                timePicker.getCurrentMinute(),
                00);

        String passString = passuri.toString();
        info.setText("\n\n***\n"
                + "Alarm is set@ " + cal.getTime() + "\n"
                + "***\n"
                + "Uri: " + passString);

        Intent intent = new Intent(getBaseContext(), AlarmReceiver.class);
        intent.putExtra("KEY_TONE_URL", passString);
        PendingIntent pendingIntent = PendingIntent.getBroadcast(
                getBaseContext(),
                RQS_1,
                intent,
                PendingIntent.FLAG_CANCEL_CURRENT);

        AlarmManager alarmManager = (AlarmManager)getSystemService(Context.ALARM_SERVICE);
        alarmManager.set(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis(), pendingIntent);
    }
}

layout/activity_main.xml

<LinearLayout 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"
    android:paddingLeft="10dp"
    android:paddingRight="10dp"
    android:paddingTop="10dp"
    android:paddingBottom="10dp"
    android:orientation="horizontal"
    tools:context=".MainActivity">

    <LinearLayout
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:orientation="vertical">

        <DatePicker
            android:id="@+id/datepicker"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:padding="5dp"/>
        <TimePicker
            android:id="@+id/timepicker"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:padding="5dp"/>

    </LinearLayout>

    <LinearLayout
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:orientation="vertical">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_horizontal"
            android:autoLink="web"
            android:text="http://android-er.blogspot.com/"
            android:textStyle="bold" />

        <RadioGroup
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" >

            <RadioButton
                android:id="@+id/optAlarm"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Alarm"
                android:checked="true" />

            <RadioButton
                android:id="@+id/optNotification"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Notification" />

            <RadioButton
                android:id="@+id/optRingtone"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Ringtone" />

            <RadioButton
                android:id="@+id/optPicker"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="ACTION_RINGTONE_PICKER" />

        </RadioGroup>

        <Button
            android:id="@+id/start"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Start"/>

        <TextView
            android:id="@+id/info"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>
    </LinearLayout>

</LinearLayout>

com.example.androidringtone.AlarmReceiver.java

package com.example.androidringtone;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.widget.Toast;

public class AlarmReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        // TODO: This method is called when the BroadcastReceiver is receiving
        // an Intent broadcast.

        String uriString = intent.getStringExtra("KEY_TONE_URL");

        Toast.makeText(context,
                "Alarm received!\n"
                + "uriString: " + uriString,
                Toast.LENGTH_LONG).show();

        Intent secIntent = new Intent(context, SecondActivity.class);
        secIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        secIntent.putExtra("SEC_RINGTONE_URI", uriString);
        context.startActivity(secIntent);

    }
}

com.example.androidringtone.SecondActivity.java

package com.example.androidringtone;

import android.media.Ringtone;
import android.media.RingtoneManager;
import android.net.Uri;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;


public class SecondActivity extends ActionBarActivity {

    TextView secInfo;
    Button btnStop;

    Ringtone ringTone;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_second);
        secInfo = (TextView)findViewById(R.id.secinfo);
        btnStop = (Button)findViewById(R.id.stop);

        String stringUri = getIntent().getStringExtra("SEC_RINGTONE_URI");
        Uri uri = Uri.parse(stringUri);
        secInfo.setText("uri: " + uri + "\n");

        ringTone = RingtoneManager
                .getRingtone(getApplicationContext(), uri);

        secInfo.append(ringTone.getTitle(SecondActivity.this));

        ringTone.play();

        btnStop.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View v) {
                if(ringTone != null){
                    ringTone.stop();
                    ringTone = null;
                }
            }
        });

    }

}

layout/activity_second.xml

<LinearLayout 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"
    android:padding="20dp"
    android:orientation="vertical"
    tools:context="com.example.androidringtone.SecondActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:autoLink="web"
        android:text="http://android-er.blogspot.com/"
        android:textStyle="bold" />

    <TextView
        android:id="@+id/secinfo"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <Button
        android:id="@+id/stop"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:text="Stop"/>

</LinearLayout>

Modify src/main/AndroidManifest.xml to add receiver of ".AlarmReceiver" and activity of ".SecondActivity".

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.androidringtone" >

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <receiver
            android:name=".AlarmReceiver"
            android:process=":remote" >
        </receiver>

        <activity
            android:name=".SecondActivity"
            android:label="@string/title_activity_second" >
        </activity>
    </application>

</manifest>

Download the files (Android Studio Format).

Download the APK.