DTMF Piano using ToneGenerator

Example to generate DTMF tones using ToneGenerator.


MainActivity.java

package com.example.androiddtmfpiano;

import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.GridView;
import android.media.AudioManager;
import android.media.ToneGenerator;
import android.os.Bundle;

public class MainActivity extends ActionBarActivity {
 
 GridView gridView;
  
 static final String[] numbers = new String[] { 
   "1", "2", "3",
   "4", "5", "6",
   "7", "8", "9",
   "*", "0", "#"};
 
 static final int[] toneTypes = new int[]{
  ToneGenerator.TONE_DTMF_1,
  ToneGenerator.TONE_DTMF_2,
  ToneGenerator.TONE_DTMF_3,
  ToneGenerator.TONE_DTMF_4,
  ToneGenerator.TONE_DTMF_5,
  ToneGenerator.TONE_DTMF_6,
  ToneGenerator.TONE_DTMF_7,
  ToneGenerator.TONE_DTMF_8,
  ToneGenerator.TONE_DTMF_9,
  ToneGenerator.TONE_DTMF_S, //*
  ToneGenerator.TONE_DTMF_0,
  ToneGenerator.TONE_DTMF_P //#
 };
 
 static int streamType = AudioManager.STREAM_MUSIC;
    static int volume = 50;
    static int durationMs = 100;
 static final ToneGenerator toneGenerator = 
   new ToneGenerator(streamType, volume);

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        gridView = (GridView) findViewById(R.id.gridView);
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(
         this, android.R.layout.simple_list_item_1, numbers);
        
        gridView.setAdapter(adapter);
        
        gridView.setOnItemClickListener(new OnItemClickListener() {

   @Override
   public void onItemClick(AdapterView<?> parent, View view,
     int position, long id) {
       toneGenerator.startTone(toneTypes[position], durationMs);
   }});
    }

}

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:orientation="vertical"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.androiddtmfpiano.MainActivity" >

    <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" />

    <GridView
        android:id="@+id/gridView"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:columnWidth="50dp"
        android:gravity="center"
        android:numColumns="3"
        android:stretchMode="columnWidth" >
    </GridView>

</LinearLayout>

Next example:
- Visible DTMF Piano: Visualizer + ToneGenerator