Android的大网格视图是滞后的，移动缓慢

Question

我有一个日历，所以我必须以每行7行52行的方式显示365天。每一天都有不同的文本。大量的操作正在执行，而生成一个。所以滚动它们是如此缓慢和滞后。如何解决这个问题?

my parent of grid class:

public class MainActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        int nr = calendar.get(Calendar.DAY_OF_YEAR);
        setContentView(R.layout.activity_main);
        calendar.setTime(new Date());
        int year = calendar.get(Calendar.YEAR);
        boolean p = ((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0);
        calendar.set(Calendar.DAY_OF_YEAR, 1);
        int before = calendar.get(Calendar.DAY_OF_WEEK)-2;
        calendar.set(Calendar.DAY_OF_YEAR, 1);
        calendar.add(Calendar.YEAR, 1);
        calendar.add(Calendar.DAY_OF_YEAR, -1);
        int after = calendar.get(Calendar.DAY_OF_WEEK)-2;
        final GridView gridView = (GridView) findViewById(R.id.main_grid_calendar);
        gridView.setAdapter(new DayAdapter(this, new String[(p?366:365)], before, after));
    }
}

my adapter class:

public class DayAdapter extends ArrayAdapter<String> {
    private Context context;
    private Calendar calendar = Calendar.getInstance();
    private final int today = calendar.get(Calendar.DAY_OF_YEAR), before, after, count;
    public DayAdapter(Context context, String[] values, int before, int after) {
        super(context, R.layout.calendar_day, new String[before + values.length + after]);
        this.context = context;
        this.before = before;
        this.after = after;
        this.count = before + values.length + after;
    }
    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {
        LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        final View day = inflater.inflate(R.layout.calendar_day, parent, false);
        final TextView date = (TextView) day.findViewById(R.id.dayitem_text_number);
        final TextView holiday = (TextView) day.findViewById(R.id.dayitem_text_holiday);
        final TextView click = (TextView) day.findViewById(R.id.dayitem_text_more);
        SharedPreferences theme = Data.getPreferences(context, Data.Prefs.THEME);
        Data.AppColorSet color = Data.getColors(Integer.parseInt(theme.getString(Data.appThemeSetings, "1")));
        date.setTextColor(color.foreground);
        holiday.setTextColor(color.foreground);
        click.setTextColor(color.foreground);
        day.setBackgroundColor(color.background);
        calendar.set(Calendar.DAY_OF_YEAR, position+1-before);
        if (position<before) {
            day.setBackgroundColor(Color.GRAY);
        } else if (position>=count-after) {
            day.setBackgroundColor(Color.GRAY);
        } else {
            day.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    Intent intent = new Intent(context, DayActivity.class);
                    intent.putExtra("id", position-3);
                    intent.putExtra("from", "calendar");
                    context.startActivity(intent);
                }
            });
        }
        String d = "" + calendar.get(Calendar.DAY_OF_MONTH);
        String m = "" + (1 + calendar.get(Calendar.MONTH));
        if (Integer.parseInt(d)<10) {
            d = "0" + d;
        }
        if (Integer.parseInt(m)<10) {
            m = "0" + m;
        }
        if (this.today==position-2) {
            RelativeLayout layout = (RelativeLayout) day.findViewById(R.id.dayitem_relative_main);
            layout.setBackgroundColor(color.dark?Color.rgb(55, 0, 0):Color.rgb(255, 200, 200));
        }
        final String today = d + "." + m;
        date.setText(today);
        String text = HolidayCalendar.getInstance(context).getTexts(today).get(0);
        String[] arr = text.split(" ");
        String result = "";
        final int words = 4;
        boolean full = false;
        if (arr.length<=words) {
            result = text;
            full = true;
        } else {
            for (int i = 0; i<words; i++) {
                result += " " + arr[i];
            }
            result += "...";
        }
        int number = HolidayCalendar.getInstance(context).getTexts(today).size() - (full?1:0);
        if (number != 0) {
            click.setText(number + " " + context.getResources().getString(R.string.see_more));
        }
        holiday.setText(result);
        WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
        Display display = wm.getDefaultDisplay();
        Point size = new Point();
        display.getSize(size);
        int width = size.x;
        day.setLayoutParams(new AbsListView.LayoutParams(width/7, width/4));
        return day;
    }
}

my parent of grid layout:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:ads="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/main_relative_main"
    tools:context="${relativePackage}.${activityClass}" >
    <GridView
        android:id="@+id/main_grid_calendar"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_above="@+id/main_adview_bottom_dark"
        android:background="#000000"
        android:horizontalSpacing="1dp"
        android:numColumns="7"
        android:verticalSpacing="1dp" >
    </GridView>
</RelativeLayout>

my adapter layout:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/dayitem_relative_main"
    android:layout_width="match_parent"
    android:layout_height="200dp"
    android:background="#FFFFFF"
    android:gravity="center" >
    <TextView
        android:id="@+id/dayitem_text_number"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="8sp" />
    <TextView
        android:id="@+id/dayitem_text_more"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_marginBottom="2dp"
        android:gravity="center_horizontal"
        android:textSize="8sp" />
    <TextView
        android:id="@+id/dayitem_text_holiday"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:layout_marginBottom="15dp"
        android:gravity="center|center"
        android:textSize="10sp" />
</RelativeLayout>

编辑:ViewHolder帮了我!谢谢!

Answer 1

在显示列表和网格时，提高性能的最佳方法和更简单的方法是使用新的RecyclerView，在您的情况下，使用GridLayoutManager。这将在不修改大量代码的情况下提高性能。在这里查看一些关于如何实现它的文档。

除此之外，你所遭受的滞后来自于在你的getView方法中使用findViewById的事实，这是一个缓慢的操作重复多次。避免一直搜索视图的最佳实践是使用ViewHolder模式。请看这个链接的第二部分