Fortschritt beim Laden zwischen zwei Aktivitäten

Question

Ich war auf der Suche nach einer Methode, um einen Fortschrittsbalken aufzubauen.

Ich habe die Hauptaktivität mit einem ImageButton, die an die Aktivität unten senden. Es dauert jedoch einige Zeit, um "Activity_Ascolta" zu laden, da der MediaPlayer die MP3-Dateien lädt. Wie kann ich eine Ladeseite zwischen diese 2 Aktivitäten legen? Es ist der Code:

public class Activity_Ascolta extends AppCompatActivity { 

    final Context context = this; 

    int flag = 0; 

    final MediaPlayer [] mpList = new MediaPlayer[50]; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 

     //Remove title bar 
     this.requestWindowFeature(Window.FEATURE_NO_TITLE); 

     //Remove notification bar 
     this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); 

     //set content view AFTER ABOVE sequence (to avoid crash) 
     this.setContentView(R.layout.layout_ascolta); 

     setContentView(R.layout.layout_ascolta); 

     final int MAX_VOLUME = 100; 
     SeekBar seekBar = (SeekBar) findViewById(R.id.sb_volume); 

     seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() { 
      @Override 
      public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) { 
       float volume = (float) (1 - (Math.log(MAX_VOLUME - progress)/Math.log(MAX_VOLUME))); 
       mpList[flag].setVolume(volume, volume); 
      } 

      @Override 
      public void onStartTrackingTouch(SeekBar seekBar) { 

      } 

      @Override 
      public void onStopTrackingTouch(SeekBar seekBar) { 

      } 
     }); 

     mpList [0] = MediaPlayer.create(Activity_Ascolta.this, R.raw.a24k_magic); 
     mpList [1] = MediaPlayer.create(Activity_Ascolta.this, R.raw.abbaon_fat_tracks); 
     mpList [2] = MediaPlayer.create(Activity_Ascolta.this, R.raw.after_the_afterlife); 
     mpList [3] = MediaPlayer.create(Activity_Ascolta.this, R.raw.amalia); 
     mpList [4] = MediaPlayer.create(Activity_Ascolta.this, R.raw.amerimacka); 
     mpList [5] = MediaPlayer.create(Activity_Ascolta.this, R.raw.angels); 
     mpList [6] = MediaPlayer.create(Activity_Ascolta.this, R.raw.anymore); 
     mpList [7] = MediaPlayer.create(Activity_Ascolta.this, R.raw.baby_gurl_original_mix); 
     mpList [8] = MediaPlayer.create(Activity_Ascolta.this, R.raw.back_home); 
     mpList [9] = MediaPlayer.create(Activity_Ascolta.this, R.raw.beautiful_escape_feat_zak_a); 
     mpList [10] = MediaPlayer.create(Activity_Ascolta.this, R.raw.better_with_you); 
     mpList [11] = MediaPlayer.create(Activity_Ascolta.this, R.raw.black_jeans_vocal_mix); 
     mpList [12] = MediaPlayer.create(Activity_Ascolta.this, R.raw.body_music); 
     mpList [13] = MediaPlayer.create(Activity_Ascolta.this, R.raw.born_to_run); 
     mpList [14] = MediaPlayer.create(Activity_Ascolta.this, R.raw.brother_john); 
     mpList [15] = MediaPlayer.create(Activity_Ascolta.this, R.raw.bye_bye_boy); 
     mpList [16] = MediaPlayer.create(Activity_Ascolta.this, R.raw.cloud_9); 
     mpList [17] = MediaPlayer.create(Activity_Ascolta.this, R.raw.daddy_s_groove); 
     mpList [18] = MediaPlayer.create(Activity_Ascolta.this, R.raw.don_t_go); 
     mpList [19] = MediaPlayer.create(Activity_Ascolta.this, R.raw.down_the_road_irfane_remix); 
     mpList [20] = MediaPlayer.create(Activity_Ascolta.this, R.raw.down_to_the_sound); 
     mpList [21] = MediaPlayer.create(Activity_Ascolta.this, R.raw.eye_of_the_tiger); 
     mpList [22] = MediaPlayer.create(Activity_Ascolta.this, R.raw.fly_feat_kelsey); 
     mpList [23] = MediaPlayer.create(Activity_Ascolta.this, R.raw.glad_edit); 
     mpList [24] = MediaPlayer.create(Activity_Ascolta.this, R.raw.i_can_see_clearly_now); 
     mpList [25] = MediaPlayer.create(Activity_Ascolta.this, R.raw.i_don_t_wanna_live_forever_fifty_shades_darker); 
     mpList [26] = MediaPlayer.create(Activity_Ascolta.this, R.raw.jump); 
     mpList [27] = MediaPlayer.create(Activity_Ascolta.this, R.raw.kill_it_tonight_feat_ice_mc); 
     mpList [28] = MediaPlayer.create(Activity_Ascolta.this, R.raw.kindling_for_the_master_majo); 
     mpList [29] = MediaPlayer.create(Activity_Ascolta.this, R.raw.lady_divine); 
     mpList [30] = MediaPlayer.create(Activity_Ascolta.this, R.raw.life_round_here); 
     mpList [31] = MediaPlayer.create(Activity_Ascolta.this, R.raw.make_you_feel); 
     mpList [32] = MediaPlayer.create(Activity_Ascolta.this, R.raw.melt_away_original_mix); 
     mpList [33] = MediaPlayer.create(Activity_Ascolta.this, R.raw.midnight_feast); 
     mpList [34] = MediaPlayer.create(Activity_Ascolta.this, R.raw.palace_posy); 
     mpList [35] = MediaPlayer.create(Activity_Ascolta.this, R.raw.pirates_of_samba_oxio_radio); 
     mpList [36] = MediaPlayer.create(Activity_Ascolta.this, R.raw.pledge_allegiance_the_rimsho); 
     mpList [37] = MediaPlayer.create(Activity_Ascolta.this, R.raw.queen_of_the_night_feat_nik); 
     mpList [38] = MediaPlayer.create(Activity_Ascolta.this, R.raw.set_me_free_feat_alexandra_p); 
     mpList [39] = MediaPlayer.create(Activity_Ascolta.this, R.raw.sister_welcome); 
     mpList [40] = MediaPlayer.create(Activity_Ascolta.this, R.raw.space_walk); 
     mpList [41] = MediaPlayer.create(Activity_Ascolta.this, R.raw.the_sweetest); 
     mpList [42] = MediaPlayer.create(Activity_Ascolta.this, R.raw.to_get_up_with_you_remix); 
     mpList [43] = MediaPlayer.create(Activity_Ascolta.this, R.raw.towers_feat_szjerdene); 
     mpList [44] = MediaPlayer.create(Activity_Ascolta.this, R.raw.traveling_miles); 
     mpList [45] = MediaPlayer.create(Activity_Ascolta.this, R.raw.tricks_main_vocal_original); 
     mpList [46] = MediaPlayer.create(Activity_Ascolta.this, R.raw.ugly_brotha_real_nices_pri); 
     mpList [47] = MediaPlayer.create(Activity_Ascolta.this, R.raw.wanting_you); 
     mpList [48] = MediaPlayer.create(Activity_Ascolta.this, R.raw.we_just_couldnt_say_goodbye); 
     mpList [49] = MediaPlayer.create(Activity_Ascolta.this, R.raw.you_d_be_so_nice_to_come_home); 

     TextView tv_sopra = (TextView) findViewById(R.id.tv_ascolta_1); 
     TextView tv_sotto = (TextView) findViewById(R.id.tv_ascolta_2); 
     TextView tv_apprezza = (TextView) findViewById(R.id.tv_ascolta_3); 

     SharedPreferences scelta_lingua = getSharedPreferences("pref_lingua", context.MODE_PRIVATE); 
     final SharedPreferences.Editor editor = scelta_lingua.edit(); 
     String lingua_corrente = scelta_lingua.getString("pref_lingua", ""); 

     if (lingua_corrente.compareTo("italiano") == 0) { 
      tv_sopra.setText("ASCOLTA"); 
      tv_sotto.setText("LA MUSICA"); 
      tv_apprezza.setText("APPREZZA LE DIFFERENZE DI OGNI CUFFIA"); 
     } else if (lingua_corrente.compareTo("inglese") == 0) { 
      tv_sopra.setText("LISTEN"); 
      tv_sotto.setText("TO THE MUSIC"); 
      tv_apprezza.setText("APPRECIATES THE DIFFERENCES OF EACH HEADSET"); 
     } 

     ImageButton returnHome = (ImageButton) findViewById(R.id.img_btt_return_home_ascolto); 
     returnHome.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View view) { 

       if (mpList != null) {mpList[flag].release();} 

       final Intent toHome = new Intent(Activity_Ascolta.this, Activity_Home.class); 
       startActivity(toHome); 

      } 
     }); 

     ImageButton playMusic = (ImageButton) findViewById(R.id.img_btt_play_music); 
     playMusic.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View view) { 

       /*final Intent toMediaPlayer = new Intent(Activity_Ascolta.this,Activity_MediaPlayer.class); 
       startActivity(toMediaPlayer);*/ 

       if (mpList != null) {mpList[flag].release();} 

       //generate random number 
       Random randomGenerator = new Random(); 
       int randomInt = randomGenerator.nextInt(50) + 1; 

       mpList[randomInt].start(); 
       flag = randomInt; 

      } 
     }); 
    } 
} 

Answer 1

Verzögerung in der zweiten Aktivität starten, ist aufgrund der Verwendung von MediaPlayer.create für alle Sounds.

Verwenden Sie MediaPlayer.create für alle Sounds verursachen Speicherverlust.

Lösung: Wenn Benutzer berühren Wiedergabeknopf, verwenden Sie den MediaPlayer.create für einen Ton.

Answer 2

Hier sind einige Dinge, die Leistung getan werden könnte, verbessern: bei

• Statt Laden alle Tracks, wenn Sie statt sie auf Nachfrage laden. Dies sorgt für eine reibungslosere Erfahrung
• Wenn Sie alle Tracks laden möchten, dann wäre es eine gute Idee, die schwere Arbeit weg von der on create Methode dieser Aktivität zu verschieben. Dies wird die Benutzeroberfläche blockieren. Zweitens können Sie die schwere Arbeit in einem Hintergrundthread erledigen und dann die Benutzeroberfläche aktualisieren, wenn sie fertig ist. Dies verhindert ein Einfrieren der Benutzeroberfläche.