Please could anyone help me with this android programming. I just need the java
ID: 3819978 • Letter: P
Question
Please could anyone help me with this android programming. I just need the java code
1. Create a Service to download the MP3 provided This MUST extend IntentService
MP3 should be downloaded when the Download option is clicked you may use either DownloadService or DownloadManager
2. Create another Service to handle playback of your newly downloaded song
This should extend Service This MUST run the MediaPlayer itself inside of a Service
The buttons in your Activity should make requests to the Service to play/stop/pause/etc
the state of the MediaPlayer should not change when the user presses the back key or home key that is, if the MediaPlayer is playing music, leaving the Activity should not stop the music
3. Manage Notifications for the following events
1. download of the MP3 has started download of the MP3 has completed
2. when the user clicks on this notification clear the notification launch your MediaPlayer Activity (hint: PendingIntent)
the song is playing you shouldn’t allow this notification to be cleared
3. the notification should go away when playback is stopped or paused
4. when the user clicks on this notification launch your MediaPlayer Activity
THINGS TO NOTE
Your Activity should not actually play the music itself, that’s what your Service is for. Clicking on the playback Buttons from within your Activity should make calls to the Service, and the Service should take the appropriate action. This prevents playback from being stopped when your Activity loses focus Do not place the MP3 inside of your res/raw directory. You’re supposed to download it, then get the URI after the download, and use the URI to launch the MediaPlayer
Explanation / Answer
1):
we will create an IntentService to download the data from server. Once download is completed, the response will be sent back to activity. Lets create a new class DownloadService.java and extend it from android.app.IntentService. Now let us override onHandleIntent() method.
When service is started the onHandleIntent() method is called on the worker thread.Unlike Service, IntentService stops itself once it completes its task, so you don’t need to call stopSelf() for stoping the IntentService.
2):
package com.example.musicplayer;
import java.util.ArrayList;
import java.util.Random;
import android.app.Notification;
import android.app.PendingIntent;
import android.app.Service;
import android.content.ContentUris;
import android.content.Intent;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.net.Uri;
import android.os.Binder;
import android.os.IBinder;
import android.os.PowerManager;
import android.util.Log;
/*
* This is demo code to accompany the Mobiletuts+ series:
* Android SDK: Creating a Music Player
*
* Sue Smith - February 2014
*/
public class MusicService extends Service implements
MediaPlayer.OnPreparedListener, MediaPlayer.OnErrorListener,
MediaPlayer.OnCompletionListener {
//media player
private MediaPlayer player;
//song list
private ArrayList<Song> songs;
//current position
private int songPosn;
//binder
private final IBinder musicBind = new MusicBinder();
//title of current song
private String songTitle="";
//notification id
private static final int NOTIFY_ID=1;
//shuffle flag and random
private boolean shuffle=false;
private Random rand;
public void onCreate(){
//create the service
super.onCreate();
//initialize position
songPosn=0;
//random
rand=new Random();
//create player
player = new MediaPlayer();
//initialize
initMusicPlayer();
}
public void initMusicPlayer(){
//set player properties
player.setWakeMode(getApplicationContext(),
PowerManager.PARTIAL_WAKE_LOCK);
player.setAudioStreamType(AudioManager.STREAM_MUSIC);
//set listeners
player.setOnPreparedListener(this);
player.setOnCompletionListener(this);
player.setOnErrorListener(this);
}
//pass song list
public void setList(ArrayList<Song> theSongs){
songs=theSongs;
}
//binder
public class MusicBinder extends Binder {
MusicService getService() {
return MusicService.this;
}
}
//activity will bind to service
@Override
public IBinder onBind(Intent intent) {
return musicBind;
}
//release resources when unbind
@Override
public boolean onUnbind(Intent intent){
player.stop();
player.release();
return false;
}
//play a song
public void playSong(){
//play
player.reset();
//get song
Song playSong = songs.get(songPosn);
//get title
songTitle=playSong.getTitle();
//get id
long currSong = playSong.getID();
//set uri
Uri trackUri = ContentUris.withAppendedId(
android.provider.MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,
currSong);
//set the data source
try{
player.setDataSource(getApplicationContext(), trackUri);
}
catch(Exception e){
Log.e("MUSIC SERVICE", "Error setting data source", e);
}
player.prepareAsync();
}
//set the song
public void setSong(int songIndex){
songPosn=songIndex;
}
@Override
public void onCompletion(MediaPlayer mp) {
//check if playback has reached the end of a track
if(player.getCurrentPosition()>0){
mp.reset();
playNext();
}
}
@Override
public boolean onError(MediaPlayer mp, int what, int extra) {
Log.v("MUSIC PLAYER", "Playback Error");
mp.reset();
return false;
}
@Override
public void onPrepared(MediaPlayer mp) {
//start playback
mp.start();
//notification
Intent notIntent = new Intent(this, MainActivity.class);
notIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
PendingIntent pendInt = PendingIntent.getActivity(this, 0,
notIntent, PendingIntent.FLAG_UPDATE_CURRENT);
Notification.Builder builder = new Notification.Builder(this);
builder.setContentIntent(pendInt)
.setSmallIcon(R.drawable.play)
.setTicker(songTitle)
.setOngoing(true)
.setContentTitle("Playing")
.setContentText(songTitle);
Notification not = builder.build();
startForeground(NOTIFY_ID, not);
}
//playback methods
public int getPosn(){
return player.getCurrentPosition();
}
public int getDur(){
return player.getDuration();
}
public boolean isPng(){
return player.isPlaying();
}
public void pausePlayer(){
player.pause();
}
public void seek(int posn){
player.seekTo(posn);
}
public void go(){
player.start();
}
//skip to previous track
public void playPrev(){
songPosn--;
if(songPosn<0) songPosn=songs.size()-1;
playSong();
}
//skip to next
public void playNext(){
if(shuffle){
int newSong = songPosn;
while(newSong==songPosn){
newSong=rand.nextInt(songs.size());
}
songPosn=newSong;
}
else{
songPosn++;
if(songPosn>=songs.size()) songPosn=0;
}
playSong();
}
@Override
public void onDestroy() {
stopForeground(true);
}
//toggle shuffle
public void setShuffle(){
if(shuffle) shuffle=false;
else shuffle=true;
}
}
3):
A):
MediaStore does not constantly update his database. Database is updated only after reboot and after sd card is mounted.
Use MediaScannerConnection.scanFile method to notify MediaStore. (MediaScannerConnection doucumentation) you can add multiple files/paths at once. Also worth noting is that this method is asynchronous, files are added in a separate process and this can take some time - you are notified when operation is completed.
D):
this is my activity:
C):
package com.example.musicplayer;
import java.util.ArrayList;
import java.util.Random;
import android.app.Notification;
import android.app.PendingIntent;
import android.app.Service;
import android.content.ContentUris;
import android.content.Intent;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.net.Uri;
import android.os.Binder;
import android.os.IBinder;
import android.os.PowerManager;
import android.util.Log;
/*
* This is demo code to accompany the Mobiletuts+ series:
* Android SDK: Creating a Music Player
*
* Sue Smith - February 2014
*/
public class MusicService extends Service implements
MediaPlayer.OnPreparedListener, MediaPlayer.OnErrorListener,
MediaPlayer.OnCompletionListener {
//media player
private MediaPlayer player;
//song list
private ArrayList<Song> songs;
//current position
private int songPosn;
//binder
private final IBinder musicBind = new MusicBinder();
//title of current song
private String songTitle="";
//notification id
private static final int NOTIFY_ID=1;
//shuffle flag and random
private boolean shuffle=false;
private Random rand;
public void onCreate(){
//create the service
super.onCreate();
//initialize position
songPosn=0;
//random
rand=new Random();
//create player
player = new MediaPlayer();
//initialize
initMusicPlayer();
}
public void initMusicPlayer(){
//set player properties
player.setWakeMode(getApplicationContext(),
PowerManager.PARTIAL_WAKE_LOCK);
player.setAudioStreamType(AudioManager.STREAM_MUSIC);
//set listeners
player.setOnPreparedListener(this);
player.setOnCompletionListener(this);
player.setOnErrorListener(this);
}
//pass song list
public void setList(ArrayList<Song> theSongs){
songs=theSongs;
}
//binder
public class MusicBinder extends Binder {
MusicService getService() {
return MusicService.this;
}
}
//activity will bind to service
@Override
public IBinder onBind(Intent intent) {
return musicBind;
}
//release resources when unbind
@Override
public boolean onUnbind(Intent intent){
player.stop();
player.release();
return false;
}
//play a song
public void playSong(){
//play
player.reset();
//get song
Song playSong = songs.get(songPosn);
//get title
songTitle=playSong.getTitle();
//get id
long currSong = playSong.getID();
//set uri
Uri trackUri = ContentUris.withAppendedId(
android.provider.MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,
currSong);
//set the data source
try{
player.setDataSource(getApplicationContext(), trackUri);
}
catch(Exception e){
Log.e("MUSIC SERVICE", "Error setting data source", e);
}
player.prepareAsync();
}
//set the song
public void setSong(int songIndex){
songPosn=songIndex;
}
@Override
public void onCompletion(MediaPlayer mp) {
//check if playback has reached the end of a track
if(player.getCurrentPosition()>0){
mp.reset();
playNext();
}
}
@Override
public boolean onError(MediaPlayer mp, int what, int extra) {
Log.v("MUSIC PLAYER", "Playback Error");
mp.reset();
return false;
}
@Override
public void onPrepared(MediaPlayer mp) {
//start playback
mp.start();
//notification
Intent notIntent = new Intent(this, MainActivity.class);
notIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
PendingIntent pendInt = PendingIntent.getActivity(this, 0,
notIntent, PendingIntent.FLAG_UPDATE_CURRENT);
Notification.Builder builder = new Notification.Builder(this);
builder.setContentIntent(pendInt)
.setSmallIcon(R.drawable.play)
.setTicker(songTitle)
.setOngoing(true)
.setContentTitle("Playing")
.setContentText(songTitle);
Notification not = builder.build();
startForeground(NOTIFY_ID, not);
}
//playback methods
public int getPosn(){
return player.getCurrentPosition();
}
public int getDur(){
return player.getDuration();
}
public boolean isPng(){
return player.isPlaying();
}
public void pausePlayer(){
player.pause();
}
public void seek(int posn){
player.seekTo(posn);
}
public void go(){
player.start();
}
//skip to previous track
public void playPrev(){
songPosn--;
if(songPosn<0) songPosn=songs.size()-1;
playSong();
}
//skip to next
public void playNext(){
if(shuffle){
int newSong = songPosn;
while(newSong==songPosn){
newSong=rand.nextInt(songs.size());
}
songPosn=newSong;
}
else{
songPosn++;
if(songPosn>=songs.size()) songPosn=0;
}
playSong();
}
@Override
public void onDestroy() {
stopForeground(true);
}
//toggle shuffle
public void setShuffle(){
if(shuffle) shuffle=false;
else shuffle=true;
}
}
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.