Android pick and play audio file

This post describes how to start a Service and stop a Service on Button click.

Create your layout in activity_main.xml. Add a Button button1 to pick audio file, another Button button2 to play audio file, a SeekBar to display the duration of song played, and two TextViews to display the duration and name of audio file.

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="PICK FILE"
        app:layout_constraintBottom_toTopOf="@+id/linear1"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <LinearLayout
        android:id="@+id/linear1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:padding="10dp"
        android:background="#ffffdd"
        android:gravity="center_horizontal"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/button1">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/textView2"
            android:textSize="18dp"
            android:text="Title"/>
        <SeekBar
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/seekbar1"
            android:max="100"
            android:padding="10dp"/>
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/textView3"
            android:textSize="20dp"
            android:padding="10dp"
            android:text="00:00 / 00:00"/>
        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="PLAY"
            android:id="@+id/button2"/>
    </LinearLayout>

</androidx.constraintlayout.widget.ConstraintLayout>

In MainActivity.java add following code.

package com.example.pickfile;

import android.content.Intent;
import android.database.Cursor;
import android.media.AudioAttributes;
import android.media.MediaPlayer;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.view.View;
import android.widget.Button;
import android.widget.SeekBar;
import android.widget.TextView;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;

import java.io.IOException;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;

public class MainActivity extends AppCompatActivity {

    TextView textview2;
    TextView textview3;
    Button button1;
    Button button2;
    SeekBar seekbar1;

    String duration;
    MediaPlayer mediaPlayer;
    ScheduledExecutorService timer;
    public static final int PICK_FILE =99;

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

        button1 = findViewById(R.id.button1);
        button2 = findViewById(R.id.button2);
        textview2 = findViewById(R.id.textView2);
        textview3 = findViewById(R.id.textView3);
        seekbar1 = findViewById(R.id.seekbar1);

        button1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT);
                intent.addCategory(Intent.CATEGORY_OPENABLE);
                intent.setType("audio/*");
                startActivityForResult(intent, PICK_FILE);
            }
        });

        button2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (mediaPlayer != null) {
                    if (mediaPlayer.isPlaying()){
                        mediaPlayer.pause();
                        button2.setText("PLAY");
                        timer.shutdown();
                    } else {
                        mediaPlayer.start();
                        button2.setText("PAUSE");

                        timer = Executors.newScheduledThreadPool(1);
                        timer.scheduleAtFixedRate(new Runnable() {
                            @Override
                            public void run() {
                                if (mediaPlayer != null) {
                                    if (!seekbar1.isPressed()) {
                                        seekbar1.setProgress(mediaPlayer.getCurrentPosition());
                                    }
                                }
                            }
                        }, 10, 10, TimeUnit.MILLISECONDS);
                    }
                }
            }
        });

        seekbar1.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
            @Override
            public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
                if (mediaPlayer != null){
                    int millis = mediaPlayer.getCurrentPosition();
                    long total_secs = TimeUnit.SECONDS.convert(millis, TimeUnit.MILLISECONDS);
                    long mins = TimeUnit.MINUTES.convert(total_secs, TimeUnit.SECONDS);
                    long secs = total_secs - (mins*60);
                    textview3.setText(mins + ":" + secs + " / " + duration);
                }
            }
            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {

            }
            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {
                if (mediaPlayer != null) {
                    mediaPlayer.seekTo(seekbar1.getProgress());
                }
            }
        });
      
        button2.setEnabled(false);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == PICK_FILE && resultCode == RESULT_OK){
            if (data != null){
                Uri uri = data.getData();
                createMediaPlayer(uri);
            }
        }
    }

    public void createMediaPlayer(Uri uri){
        mediaPlayer = new MediaPlayer();
        mediaPlayer.setAudioAttributes(
                new AudioAttributes.Builder()
                        .setContentType(AudioAttributes.CONTENT_TYPE_MUSIC)
                        .setUsage(AudioAttributes.USAGE_MEDIA)
                        .build()
        );
        try {
            mediaPlayer.setDataSource(getApplicationContext(), uri);
            mediaPlayer.prepare();

            textview2.setText(getNameFromUri(uri));
            button2.setEnabled(true);

            int millis = mediaPlayer.getDuration();
            long total_secs = TimeUnit.SECONDS.convert(millis, TimeUnit.MILLISECONDS);
            long mins = TimeUnit.MINUTES.convert(total_secs, TimeUnit.SECONDS);
            long secs = total_secs - (mins*60);
            duration = mins + ":" + secs;
            textview3.setText("00:00 / " + duration);
            seekbar1.setMax(millis);
            seekbar1.setProgress(0);

            mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
                @Override
                public void onCompletion(MediaPlayer mp) {
                    releaseMediaPlayer();
                }
            });
        } catch (IOException e){
            textview2.setText(e.toString());
        }
    }

    public String getNameFromUri(Uri uri){
        String fileName = "";
        Cursor cursor = null;
        cursor = getContentResolver().query(uri, new String[]{
                MediaStore.Images.ImageColumns.DISPLAY_NAME
        }, null, null, null);
        if (cursor != null && cursor.moveToFirst()) {
            fileName = cursor.getString(cursor.getColumnIndex(MediaStore.Images.ImageColumns.DISPLAY_NAME));
        }
        if (cursor != null) {
            cursor.close();
        }
        return fileName;
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        releaseMediaPlayer();
    }

    public void releaseMediaPlayer(){
        if (timer != null) {
            timer.shutdown();
        }
        if (mediaPlayer != null) {
            mediaPlayer.release();
            mediaPlayer = null;
        }
        button2.setEnabled(false);
        textview2.setText("TITLE");
        textview3.setText("00:00 / 00:00");
        seekbar1.setMax(100);
        seekbar1.setProgress(0);
    }

}

Now run the app.

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