如何保持记忆空？ Android的

Question

我的应用有两个“重”片段。当我在它们之间移动时，每次分配内存~40mb。同时他们没有大的位图或类似的东西。每次垃圾收集器释放一小部分内存~10mb。我的问题是我做了什么来防止分配内存或释放它？

@Override
public void onActivityCreated(Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);
    onCreateCreator();
    name_text = (TextView) getView().findViewById(R.id.info_title);
    artist_text = (TextView) getView().findViewById(R.id.info_artist);
    info_duration = (TextView) getView().findViewById(R.id.info_duration);
    crossfade_duration = (TextView) getView().findViewById(R.id.crossfade_duration_text);
    crossfade_duration.setOnClickListener(this);
    increase_duration = (TextView) getView().findViewById(R.id.increase_duration_text);
    increase_duration.setOnClickListener(this);
    fading_duration = (TextView) getView().findViewById(R.id.fading_duration_text);

    crossfade_switch = (Switch) getView().findViewById(R.id.crossfade_switch);
    crossfade_switch.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(CompoundButton compoundButton, boolean b) {
            if (!b) {
                fading_switch.setChecked(false);
            }
            fading_switch.setEnabled(b);
        }
    });

    fading_switch = (Switch) getView().findViewById(R.id.fading_switch);
    increase_switch = (Switch) getView().findViewById(R.id.increase_switch);

    save = (Button) getView().findViewById(R.id.save);
    save.setOnClickListener(this);
    save_to_playlist = (Button) getView().findViewById(R.id.save_to_playlist);
    save_to_playlist.setOnClickListener(this);

    cover = (ImageView) getView().findViewById(R.id.info_cover);

    skip = (RelativeLayout) getView().findViewById(R.id.skip_layout);
    skip.setOnClickListener(this);
    if (MODE == MODE_SINGLE) {
        skip.setVisibility(View.GONE);
        fill(track);
    }
    else {
        skip.setVisibility(View.VISIBLE);
        fill(tracks.get(0));
    }
}

private void fill(Track track){

    this.track = track;
    cover.setImageBitmap(default_cover);
    int end_millis = Integer.valueOf(Settings.getMetadata(track.getPath(), MediaMetadataRetriever.METADATA_KEY_DURATION));
    name_text.setText(track.getName());
    artist_text.setText(track.getArtist());
    info_duration.setText(getResources().getString(R.string.info_duration) + ": " + Settings.getUserInterfaceDuration(end_millis, true, false));
    if (task != null) task.cancel(true);
    task = new MyTask(cover);
    task.execute(track);

    crossfade_duration.setText(String.valueOf(Settings.CROSSFADE_START));
    fading_duration.setText(String.valueOf(Settings.CROSSFADE_START));
    increase_duration.setText("0");
    fading_switch.setEnabled(false);

    fading_switch.setChecked(track.isFading());

    if (track.isMegamixTrack()){
        if (track.getCrossfadeDuration() > 1000){
            crossfade_switch.setChecked(true);
            crossfade_duration.setText(String.valueOf(track.getCrossfadeDuration()));
            fading_duration.setText(String.valueOf(track.getCrossfadeDuration()));
        }
        if (track.getIncrease() > 0){
            increase_switch.setChecked(true);
            increase_duration.setText(String.valueOf(track.getIncrease()));
        }
    } else{
        crossfade_switch.setChecked(false);
        increase_switch.setChecked(false);
    }
}