IPOD Development Doc

> Read Songs From Phone Part - 1

• commit the viewpagers and the style of tabindicator.

1. Download the TabLayout. Tip1, Tip2

<com.google.android.material.tabs.TabLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@color/colorPrimaryDark"
    android:id="@+id/tab_layout"
    app:tabIndicatorFullWidth="true"
    app:tabIndicatorGravity="center"
    app:tabTextColor="@color/colorAccent"
    app:tabIndicatorHeight="40dp"
    app:tabIndicatorColor="#009688"
    app:tabIndicator="@drawable/tab_indicator"/>

2. ViewPager

<com.google.android.material.tabs.TabLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@color/colorPrimaryDark"
    android:id="@+id/tab_layout"
    app:tabIndicatorFullWidth="true"
    app:tabIndicatorGravity="center"
    app:tabTextColor="@color/colorAccent"
    app:tabIndicatorHeight="40dp"
    app:tabIndicatorColor="#009688"
    app:tabIndicator="@drawable/tab_indicator"/>

3. Viewpageradapter

public static class ViewPagerAdapter extends FragmentPagerAdapter {
    private ArrayList<Fragment> fragments;
    private ArrayList<String> titles;


    public ViewPagerAdapter(@NonNull FragmentManager fm) {
        super(fm);
        this.fragments = new ArrayList<>();
        this.titles = new ArrayList<>();
    }

    void addFragments(Fragment fragment, String title){
        fragments.add(fragment);
        titles.add(title);
    }

    @NonNull
    @Override
    public Fragment getItem(int position) {
        return fragments.get(position);
    }

    @Override
    public int getCount() {
        return fragments.size();
    }

    @Nullable
    @Override
    public CharSequence getPageTitle(int position) {
        return titles.get(position);
    }
}

4. New songsFragment.xml and albumFragment.xml

• RecyclerView

5. New tabindicator.xml to initialize its style

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <gradient android:centerColor="@color/colorPrimaryDark" android:angle="0"/>
</shape>

> Read Songs From Phone Part - 2

• Add the permission of usage, fetch all the songs where from the storage to app.

1. Add permission in MainActivity.java

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

private void permission() {
    if (ContextCompat.checkSelfPermission(getApplicationContext(), Manifest.permission.WRITE_EXTERNAL_STORAGE)
        != PackageManager.PERMISSION_GRANTED)
    {
        ActivityCompat.requestPermissions(MainActivity.this,new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},REQUEST_CODE);
    }
    else
    {
        musicFiles = getAllAudio(this);
        initViewPager();
    }
}

2. Add permission in AndroidMainfest.xml

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

3. Add onRequestPermissionsResult() in MainActivity.java

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    if (requestCode == REQUEST_CODE)
    {
        if (grantResults[0] == PackageManager.PERMISSION_GRANTED)
        {
            //Do whatever you want permission related;
            musicFiles = getAllAudio(this);
            initViewPager();

        }
        else
        {
            ActivityCompat.requestPermissions(MainActivity.this,new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},REQUEST_CODE);
        }
    }
}

4. New io.wriprin.android.ipod.MusicFiles.java to pack attributes of songs

• notice about the short key, Alt + Insert to generate the constructor and the Getter, Setter;

5. Add ArrayList getAllAudio

public ArrayList<MusicFiles> getAllAudio (Context context)
    {
            ArrayList<MusicFiles> tempAudioList = new ArrayList<>();
            Uri uri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
            String[] projection =
            {
                MediaStore.Audio.Media.ALBUM,
                MediaStore.Audio.Media.TITLE,
                MediaStore.Audio.Media.DURATION,
                MediaStore.Audio.Media.DATA,    //for path
                MediaStore.Audio.Media.ARTIST,
                MediaStore.Audio.Media._ID

            };
            Cursor cursor = context.getContentResolver().query(uri,projection,null,null, order);
        	if (cursor != null)
        	{
            	while (cursor.moveToNext())
            	{
                    String album = cursor.getString(0);
                    String title = cursor.getString(1);
                    String duration = cursor.getString(2);
                    String path = cursor.getString(3);
                    String artist = cursor.getString(4);
                    String id = cursor.getString(5);

                    MusicFiles musicFiles = new MusicFiles(path, title, artist, album, duration, id);
                    //take log.e for check
                    Log.e("Path:" + path, "Album" + album);
                    tempAudioList.add(musicFiles);
                    if (!duplicate.contains(album)) {
                        albums.add(musicFiles);
                        duplicate.add(album);
                    }
                }
                cursor.close();
            }
            return tempAudioList;
    }

• context.getContentResolver().query

6. Global Declaration the MusicFiles to use it when user choose allow permission

> Read Songs From Phone Part - 3

• Display SongList

1. New layout resource files - music_items.xml to display the SongList

2. New io.wriprin.android.ipod.MusicAdapter.java collect the info

• ViewHolder()

• Context()

• Adapter()

• Inflater()

• byte[]

3. Import Glide dependency to build.gradle (Module: app)

//Glide
implementation 'com.github.bumptech.glide:glide:4.11.0'
annotationProcessor 'com.github.bumptech.glide:compiler:4.11.0'

4. songsFragment.java - recyclerview match Adapter

> Read Songs From Phone Part - 4

• Commit the layout of PlayerActivity

1. Add the Vector Assest which under drawable and change to a suitable color.

2. New io.wriprin.android.ipod.PlayerActivity(EmptyActivity)

3. New (Drawable Resource File ) - main_bg.xml

• RootElement is shape

4. New (Drawable Resource File ) - gradient.xml

• ImageView's scaleType

• ellipsize

5. Add FloatingActionButton in activity_player.xml

<com.google.android.material.floatingactionbutton.FloatingActionButton
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/play_pause"
    android:src="@drawable/ic_play"
    android:layout_centerHorizontal="true"
    android:layout_centerVertical="true"
    android:focusable="true"
    android:clickable="true"/>

• why use focusable

> Read Songs From Phone Part - 5 | PlayAudio

• Commit the FUNC of itemview.click

1. Add itemview.click in MusicAdapter.java

holder.itemView.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        Intent intent = new Intent(mContext, PlayerActivity.class);
        intent.putExtra("position",position);
        mContext.startActivity(intent);
    }
});

2. Add TimeLine's layout in activity_player.xml

• SeekBar

3. Implement the Init FUNC of PlayerActivity.java

• Declare and assign

4. MusicAdapter.java to add intent.putExtra()

intent.putExtra("position",position);

• position

5. PlayerActivity.java get the position from MusicAdapter.java

position = getIntent().getIntExtra("position",-1);

• static

6. Implement the method of playing

private void getIntentMethod() {
    position = getIntent().getIntExtra("position",-1);
    String sender = getIntent().getStringExtra("sender");
    if (sender != null && sender.equals("albumDetails"))
    {
        listSongs = albumFiles;
    }
    else
    {
        listSongs = mFiles;
    }
    if (listSongs != null)
    {
        playPauseBtn.setImageResource(R.drawable.ic_pause);
        uri = Uri.parse(listSongs.get(position).getPath());
    }
    if (mediaPlayer != null)
    {
        mediaPlayer.stop();
        mediaPlayer.release();
        mediaPlayer = MediaPlayer.create(getApplicationContext(), uri);
        mediaPlayer.start();
    }
    else
    {
        mediaPlayer = MediaPlayer.create(getApplicationContext(), uri);
        mediaPlayer.start();
    }
    seekBar.setMax(mediaPlayer.getDuration() / 1000);
    metaData(uri);
}

• MediaPlayer

7. Implement the timeline_Durationbar and FortmattedTime

• runOnUiThread Thread collocate with Handler

> Read Songs From Phone Part - 6 | Button Config

• Read the song_name and artist to the PlayerActivity, Commit the FUNC of playing and resuming the music

1. Add Metadata() in PlayerActivity.java

private  void metaData(Uri uri)
    {
        MediaMetadataRetriever retriever = new MediaMetadataRetriever();
        retriever.setDataSource(uri.toString());
        int durationTotal = Integer.parseInt(listSongs.get(position).getDuration()) / 1000;
        duration_total.setText(formattedTime(durationTotal));
        byte[] art = retriever.getEmbeddedPicture();
        if (art != null)
        {
            Glide.with(this)
                    .asBitmap()
                    .load(art)
                    .into(cover_art);
        }
        else
        {
            Glide.with(this)
                    .asBitmap()
                    .load(R.drawable.bewedoc)
                    .into(cover_art);
        }
    }

• Bitmap

2. Display song_name and artist_name

song_name.setText(listSongs.get(position).getTitle());      
artist_name.setText(listSongs.get(position).getArtist());

3.

4.

5.

6.