0
Проблемы
ViewPager не перерисовывать содержимое на взмахе назад
Я новичок в андроид и я использую ViewPager в первый раз в моем приложении и я страдаю от очень странного поведения в моем приложении, которое я использую ViewPager с тремя фрагментами (TrackFragment, AlbumFragment, ArtistFragment) и когда я SWIP страницы из TrackFragment к AlbumFragment и снова вернуться к TrackFragment становится пустым (но это было не в первый раз, когда я нахожусь в TrackFragment), и то же самое произошло, когда я прыгнул на ArtistFragment или любые другие фрагменты из макета вкладки (он стал пустым).
И в случае, если я буду ArtistFragment из TrackFragment через AlbumFragments, проводя страницы это работает правильно (то есть содержание представлены в страницах).
Пожалуйста, предложите мне метод преодоления вышеуказанной проблемы или любого другого метода для реализации того же самого. Вот мой код ....
MainActivity
public class MainActivity extends AppCompatActivity {
private String[] mPlanetTitles={"Tracks","Album","Artist"};
private DrawerLayout mDrawerLayout;
private ListView mDrawerList;
SharedPreferences sharedPreferences;
Fragment [] fragments = {new TracksFragment(),new AlbumFragment(), new ArtistFragment()};
PagerAdapter pagerAdapter;
ViewPager viewPager;
public static ImageView im;
int pos= -1 ;
public static Context context;
MusicService musicService;
boolean mBound;
TabLayout tabLayout ;
public static Uri currentsonguri;
protected void onCreate(final Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
sharedPreferences = getSharedPreferences("lastplayed",Context.MODE_PRIVATE);
Intent i = new Intent(MainActivity.this,MusicService.class);
startService(i);
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerList = (ListView) findViewById(R.id.left_drawer);
mDrawerList.setAdapter(new NavigationDrawerAdapter(this));
mDrawerList.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
if(position == 3)
{
Intent i = new Intent(MainActivity.this,PlaylistActivity.class);
startActivity(i);
}
if(position == 4)
{
Intent intent = new Intent();
intent.setAction("android.media.action.DISPLAY_AUDIO_EFFECT_CONTROL_PANEL");
if((intent.resolveActivity(getPackageManager()) != null)) {
startActivity(intent);
} else {
// No equalizer found :(
Toast.makeText(getBaseContext(),"No Equaliser Found",Toast.LENGTH_LONG).show();
}
}
}
});
tabLayout = (TabLayout) findViewById(R.id.tablayout);
viewPager = (ViewPager) findViewById(R.id.viewPager);
tabLayout.setTabTextColors(Color.DKGRAY,Color.WHITE);
tabLayout.setTabMode(TabLayout.MODE_SCROLLABLE);
context = getBaseContext();
pagerAdapter = new myfragment(getSupportFragmentManager());
im = (ImageView) findViewById(R.id.currentsong);
viewPager.setPageTransformer(true, new ZoomOutPageTransformer());
viewPager.setAdapter(pagerAdapter);
tabLayout.setupWithViewPager(viewPager,true);
SharedPreferences.Editor editor= sharedPreferences.edit();
if(sharedPreferences.getInt("count",0)==0)
{
editor.putInt("count",1);
}
else
{
int c= sharedPreferences.getInt("count",0);
Log.d("Uses count",c+"");
editor.putInt("count",c++);
editor.apply();
}
if(!sharedPreferences.getString("uri","").equals(""))
{
String s = sharedPreferences.getString("uri","");
Uri u = Uri.parse(s);
currentsonguri = u;
MediaMetadataRetriever data=new MediaMetadataRetriever();
data.setDataSource(getBaseContext(),u);
try {
byte[] b = data.getEmbeddedPicture();
Bitmap bitmap = BitmapFactory.decodeByteArray(b, 0, b.length);
bitmap = getRoundedCornerBitmap(bitmap);
im.setImageBitmap(bitmap);
}
catch (Exception e)
{
e.printStackTrace();
}
try {
musicService.setsongbyuri(u,getBaseContext());
musicService.setMediaPlayer();
}
catch (Exception e)
{
e.printStackTrace();
}
}
else
{
}
editor.apply();
im.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this, MusicPlayerActivity.class);
intent.setData(currentsonguri);
intent.putExtra("flag",1);
startActivity(intent);
}
});
final Uri r= getIntent().getData();
if(r!=null) {
currentsonguri = r;
Intent intent = new Intent(MainActivity.this, MusicPlayerActivity.class);
intent.setData(r);
intent.putExtra("flag",0);
startActivity(intent);
}
}
public class myfragment extends FragmentPagerAdapter {
myfragment(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
return fragments[position];
}
@Override
public int getCount() {
return 3;
}
@Override
public CharSequence getPageTitle(int position) {
String s = "non";
switch (position)
{
case 0 : s= "Tracks" ;
break;
case 1: s= "Albums" ;
break;
case 2: s= "Artist" ;
break;
}
return s;
}
}
public void setview(byte [] b, int position,Uri uri)
{
currentsonguri = uri;
Log.d("position in set view",""+position);
Log.d("fail","i am here");
if(im!=null)
{
if(b!=null)
{
Bitmap bitmap = BitmapFactory.decodeByteArray(b, 0, b.length);
bitmap = getRoundedCornerBitmap(bitmap);
im.setImageBitmap(bitmap);
}
else {
songDetailloader loader = new songDetailloader(context);
String s = loader.albumartwithalbum(loader.songalbum(position));
Log.d("fail","fail to set small image");
if (s != null) {
im.setImageBitmap(BitmapFactory.decodeFile(s));
Log.d("fail","nowsetting set small image");
} else {
im.setImageResource(R.drawable.default_track_light);
Log.d("ic","ic_launcher setted");
}
}
}
else {
Log.d(""," im is null");
}
}
public static Bitmap getRoundedCornerBitmap(Bitmap bitmap) {
Bitmap output = Bitmap.createBitmap(bitmap.getWidth(),
bitmap.getHeight(), Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(output);
final int color = 0xff424242;
final Paint paint = new Paint();
final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
final RectF rectF = new RectF(rect);
final float roundPx = 100;
paint.setAntiAlias(true);
canvas.drawARGB(0, 0, 0, 0);
paint.setColor(color);
canvas.drawRoundRect(rectF, roundPx, roundPx, paint);
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
canvas.drawBitmap(bitmap, rect, rect, paint);
return output;
}
private ServiceConnection serviceConnection = new ServiceConnection() {
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
MusicService.LocalBinder binder = (MusicService.LocalBinder) service;
musicService = binder.getService();
mBound =true;
}
@Override
public void onServiceDisconnected(ComponentName name) {
mBound =false;
}
};
@Override
protected void onDestroy() {
super.onDestroy();
Log.d("MainActivity","Get distoryed");
}
@Override
protected void onResume() {
super.onResume();
Intent i = new Intent(this,MusicService.class);
bindService(i, serviceConnection, Context.BIND_AUTO_CREATE);
}
@Override
protected void onStart() {
super.onStart();
}
@Override
protected void onStop() {
super.onStop();
unbindService(serviceConnection);
}}
Дорожки Фрагмент
public class TracksFragment extends Fragment {
songDetailloader loader = new songDetailloader();
ArrayList<Songs> give = new ArrayList<>();
public int pos = -1;
MediaPlayer mp ;
MusicService musicService;
boolean mBound;
ImageView search;
ListViewAdapter listViewAdapter;
RelativeLayout editreltive;
ListView listView;
EditText editText;
TextView ch;
private Cursor cursor ;
int albumindex,dataindex,titleindex,durationindex,artistindex;
private final static String[] columns ={MediaStore.Audio.Media.DATA, MediaStore.Audio.Media.DURATION, MediaStore.Audio.Media.ALBUM, MediaStore.Audio.Media.ARTIST, MediaStore.Audio.Media.TITLE, MediaStore.Audio.Media.IS_MUSIC,MediaStore.Audio.Media.IS_RINGTONE,MediaStore.Audio.Media.ARTIST,MediaStore.Audio.Media.SIZE ,MediaStore.Audio.Media._ID};
private final String where = "is_music AND duration > 10000 AND _size <> '0' ";
private final String orderBy = MediaStore.Audio.Media.TITLE;
public TracksFragment() {
}
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Log.d("fragment created","created");
setRetainInstance(true);
}
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable final ViewGroup container, @Nullable Bundle savedInstanceState)
{
View v =inflater.inflate(R.layout.listviewofsongs,container,false);
listView = (ListView) v.findViewById(R.id.listView);
allsongs();
intlistview();
new Thread(new Runnable() {
@Override
public void run() {
Intent i = new Intent(getActivity(),MusicService.class);
getActivity().bindService(i, serviceConnection, Context.BIND_AUTO_CREATE);
}
}).start();
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id)
{
Log.d("Uri of ",""+give.get(position).getSonguri());
musicService.setplaylist(give,give.get(position).getPosition());
musicService.setMediaPlayer();
view.setSelected(true);
}
});
listView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
@Override
public boolean onItemLongClick(AdapterView<?> parent, View view, final int position, long id) {
final AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
View v =LayoutInflater.from(getContext()).inflate(R.layout.select_dialog_layout,null);
builder.setView(v);
builder.setTitle(give.get(position).gettitle()+"\n "+give.get(position).getalbum());
builder.create();
final AlertDialog d=builder.show();
//seting click listner.....
TextView play = (TextView) v.findViewById(R.id.dialogplay);
TextView playnext = (TextView) v.findViewById(R.id.dialogplaynext);
TextView queue = (TextView) v.findViewById(R.id.dialogqueue);
TextView fav = (TextView) v.findViewById(R.id.dialogaddtofav);
TextView album = (TextView) v.findViewById(R.id.dialogalbum);
TextView artist = (TextView) v.findViewById(R.id.dialogartist);
TextView playlist = (TextView) v.findViewById(R.id.dialogaddtoplaylsit);
TextView share = (TextView) v.findViewById(R.id.dialogshare);
TextView delete = (TextView) v.findViewById(R.id.dialogdelete);
TextView properties = (TextView) v.findViewById(R.id.dialogproperties);
play.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
File f= new File(give.get(position).getSonguri().getLastPathSegment());
Log.d("LENGTH IS",""+f.length());
musicService.setplaylist(give,position);
musicService.setMediaPlayer();
d.dismiss();
}
});
playnext.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
d.dismiss();
}
});
queue.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
d.dismiss();
musicService.insertinqueue(give.get(position));
}
});
fav.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
d.dismiss();
DataBaseClass db = new DataBaseClass(getContext());
int i=db.insetintoliked(give.get(position));
if(i==1)
{
Toast.makeText(getContext(),"Added to Favorites",Toast.LENGTH_SHORT).show();
}
else
Toast.makeText(getContext(),"Already in Favorites",Toast.LENGTH_SHORT).show();
}
});
album.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
d.dismiss();
Intent i = new Intent(getActivity() , AlbumDetail.class);
Bundle b= new Bundle();
b.putCharSequence("album",give.get(position).getalbum());
i.putExtras(b);
startActivity(i);
}
});
artist.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent i=new Intent(getActivity(),ArtistActivity.class);
i.putExtra("artist",give.get(position).getartist());
startActivity(i);
d.dismiss();
}
});
playlist.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
d.dismiss();
}
});
delete.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
AlertDialog.Builder b = new AlertDialog.Builder(getContext());
b.setMessage("Audio '"+give.get(position).gettitle()+"' will be deleted permanently !");
b.setTitle("Delete ?");
b.setNegativeButton("No", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
d.dismiss();
}
});
b.setPositiveButton("Delete", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
File f= new File(give.get(position).getSonguri().getPath());
boolean b = f.delete();
Log.d("Is file exist",f.exists()+"");
Log.d("File Lenth",""+f.length());
Log.d("Return value",""+b);
loader.set(getContext());
loader.deleteSong(getContext(),give.get(position).getPosition());
give.remove(position); // give is Arraylist of Songs(datatype);
listViewAdapter.notifyDataSetChanged();
if(b)
{
Toast.makeText(getContext(),"Deleted",Toast.LENGTH_SHORT).show();
}
else
{
Toast.makeText(getContext(),"Fail to Delete",Toast.LENGTH_SHORT).show();
}
}
});
b.create().show();
d.dismiss();
}
});
share.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
d.dismiss();
Intent share = new Intent(Intent.ACTION_SEND);
share.setType("audio/*");
share.putExtra(Intent.EXTRA_STREAM, give.get(position).getSonguri());
startActivity(Intent.createChooser(share, "Share Audio"));
}
});
properties.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
AlertDialog.Builder b = new AlertDialog.Builder(getContext());
File f= new File(give.get(position).getSonguri().getPath());
long size = (f.length())/1024;
long mb= size/1024;
long kb= size%1024;
b.setMessage("Size:"+"\n"+"Size "+mb+"."+kb+" MB\n"+"Path:"+f.getAbsolutePath()+"\n");
b.setTitle(f.getName());
b.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
}
});
b.create().show();
d.dismiss();
}
});
return true;
}
});
return v;
}
@Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
Log.d("fragment","instance saved");
}
@Override
public void onViewStateRestored(@Nullable Bundle savedInstanceState) {
super.onViewStateRestored(savedInstanceState);
Log.d("Fragment","Instance Restored");
}
public void intlistview()
{
listViewAdapter = new ListViewAdapter(getContext(),give);
listView.setAdapter(listViewAdapter);
}
@Override
public void onDestroy() {
super.onDestroy();
Log.d("Fragment","Destroyed");
getActivity().unbindService(serviceConnection);
}
private ServiceConnection serviceConnection = new ServiceConnection() {
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
MusicService.LocalBinder binder = (MusicService.LocalBinder) service;
musicService = binder.getService();
mBound =true;
}
@Override
public void onServiceDisconnected(ComponentName name) {
mBound =false;
}
};
public void allsongs()
{
cursor = getContext().getContentResolver().query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, columns, where, null, orderBy);
dataindex = cursor.getColumnIndex(MediaStore.Audio.Media.DATA);
albumindex = cursor.getColumnIndex(MediaStore.Audio.Media.ALBUM);
titleindex = cursor.getColumnIndex(MediaStore.Audio.Media.TITLE);
durationindex = cursor.getColumnIndex(MediaStore.Audio.Media.DURATION);
artistindex = cursor.getColumnIndex(MediaStore.Audio.Media.ARTIST);
cursor.moveToFirst();
for(int i=0;i<cursor.getCount();i++)
{
Songs song = new Songs();
song.setalbum(cursor.getString(albumindex));
song.settitle(cursor.getString(titleindex));
song.setSonguri(Uri.parse(cursor.getString(dataindex)));
song.setartist(cursor.getString(artistindex));
song.setDuration(Long.decode(cursor.getString(durationindex)));
song.setPosition(cursor.getPosition());
this.give.add(song);
cursor.moveToNext();
}
cursor.close();
}}
Альбом Фрагмент
public class AlbumFragment extends Fragment {
songDetailloader songDetailloader = new songDetailloader();
public AlbumFragment() {
super();
}
GridView gridView;
AlbumAdapter a;
private static ArrayList<Bitmap> image = new ArrayList<>();
LinearLayout linearLayout;
Cursor cursor ;
ImageView album;
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setRetainInstance(true);
}
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
final View v =inflater.inflate(R.layout.albumgridview,container,false);
gridView = (GridView) v.findViewById(R.id.gridview);
album = (ImageView) v.findViewById(R.id.albumart);
/*Animation animation = AnimationUtils.loadAnimation(getContext(),R.anim.grid_layout_anim);
GridLayoutAnimationController controller = new GridLayoutAnimationController(animation,0.2f,0.2f);
gridView.setLayoutAnimation(controller);*/
final TextView albumname = (TextView) v.findViewById(R.id.albumname);
cursor = songDetailloader.getAlbumCursor(getContext());
if(image.size()==0)
new getbitmaps().execute();
gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
String s = songDetailloader.albumart(position);
Intent i = new Intent(getActivity() , AlbumDetail.class);
Bundle b= new Bundle();
b.putCharSequence("album",songDetailloader.album(position));
i.putExtras(b);
startActivity(i);
}
});
return v;
}
public class getbitmaps extends AsyncTask<Void,Void,Void>
{
Bitmap b;
public getbitmaps() {
super();
}
@Override
protected void onPreExecute() {
super.onPreExecute();
}
@Override
protected Void doInBackground(Void... params) {
for(int i=0;i<cursor.getCount();i++)
{
cursor.moveToPosition(i);
BitmapFactory.Options options = new BitmapFactory.Options();
options.inSampleSize= 2;
b=BitmapFactory.decodeFile(cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Albums.ALBUM_ART)),options);
if(b==null)
{
b=BitmapFactory.decodeFile(cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Albums.ALBUM_ART)));
}
image.add(b);
}
cursor.close();
return null;
}
@Override
protected void onPostExecute(Void aVoid) {
super.onPostExecute(aVoid);
a =new AlbumAdapter(getContext(),image);
a.setCursor();
gridView.setAdapter(a);
new Thread(new Runnable() {
@Override
public void run() {
songDetailloader.set(getContext());
}
}).start();
}
}}
Исполнитель Фрагмент
public class ArtistFragment extends Fragment {
ListView listView ;
ArrayList<Artists> aa = new ArrayList<>();
final String[] columns3 = {MediaStore.Audio.Artists._ID, MediaStore.Audio.Artists.ARTIST,MediaStore.Audio.Artists.NUMBER_OF_ALBUMS,MediaStore.Audio.Artists.NUMBER_OF_TRACKS};
final static String orderBy3 = MediaStore.Audio.Albums.ARTIST;
public Cursor cursor3;
public ArtistFragment() {
super();
}
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setRetainInstance(true);
}
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v= inflater.inflate(R.layout.listviewofsongs,container,false);
listView = (ListView) v.findViewById(R.id.listView);
new artist().execute();
return v;
}
public class artist extends AsyncTask<Void, Void ,Void>
{
@Override
protected void onPreExecute() {
super.onPreExecute();
}
@Override
protected Void doInBackground(Void... params) {
allartist();
return null;
}
@Override
protected void onPostExecute(Void aVoid) {
super.onPostExecute(aVoid);
ArtistAdapter artistAdapter = new ArtistAdapter(getActivity().getBaseContext(),aa);
listView.setAdapter(artistAdapter);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Intent i= new Intent(getActivity(), ArtistActivity.class);
i.putExtra("artist", aa.get(position).getArtistname());
i.putExtra("noofsongs",aa.get(position).getNofosongs());
startActivity(i);
}
});
}
}
@Override
public void setInitialSavedState(SavedState state) {
super.setInitialSavedState(state);
}
@Override
public void onViewStateRestored(@Nullable Bundle savedInstanceState) {
super.onViewStateRestored(savedInstanceState);
}
@Override
public void onDestroy() {
super.onDestroy();
}
public void allartist()
{
cursor3 = getContext().getContentResolver().query(MediaStore.Audio.Artists.EXTERNAL_CONTENT_URI, columns3, null, null, orderBy3);
cursor3.moveToFirst();
for(int i=0;i< cursor3.getCount() ;i++)
{
Artists art = new Artists();
art.setArtistname(cursor3.getString(cursor3.getColumnIndex(MediaStore.Audio.Artists.ARTIST)));
art.setNoalbums(Integer.parseInt(cursor3.getString(cursor3.getColumnIndex(MediaStore.Audio.Artists.NUMBER_OF_ALBUMS))));
art.setNofosongs(Integer.parseInt(cursor3.getString(cursor3.getColumnIndex(MediaStore.Audio.Artists.NUMBER_OF_TRACKS))));
this.aa.add(art);
cursor3.moveToNext();
}
cursor3.close();
}}
Я попробовал его с помощью 'viewPager.setOffscreenPageLimit (3)', но проблема остается такой же. –
Я обновил ответ –
Его работа, но страницы загружены с некоторой задержкой .. –