Question

在我的应用程序中，我有一个滚动菜单，我将此功能用于完整的菜单项。但大部分时间我都会出现内存错误。我的模拟器中没有出错。但我的设备一直都在失败。我试过了

   android:hardwareAccelerated="false"
    android:largeHeap="true"

也缩小了图像尺寸。但设备说它需要太多的内存。我希望我的应用程序加载速度更快，内存效率更高。我仍然是android的首发。我看到一些关于有效加载图像的文章。但我不明白。有人可以帮我提供一些示例代码吗？

public void RefreshMenuItems(int category) {
    //Create menu scroller
    LinearLayout.LayoutParams card_lp = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.MATCH_PARENT);
    card_lp.setMargins(dp(5), 0, dp(5), 0);

    LinearLayout.LayoutParams image_lp = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, 0);
    image_lp.setMargins(dp(40), dp(5), dp(40), dp(5));
    image_lp.weight = 0.5f;

    LinearLayout.LayoutParams desc_lp = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, 0);
    desc_lp.weight = 0.32f;

    LinearLayout.LayoutParams title_lp = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, 0);
    title_lp.weight = 0.08f;

    RelativeLayout.LayoutParams price_rp = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
    price_rp.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);

    RelativeLayout.LayoutParams buy_rp = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
    buy_rp.addRule(RelativeLayout.ALIGN_PARENT_LEFT);

    LinearLayout.LayoutParams bottom_lp = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, 0);
    bottom_lp.weight = 0.1f;

    //fill menu
    for (int i = 0; i < item_title.length; i++) {
        final int currenti = i;

        if ((item_category[i] == category) || category == 0) {
            TextView title = new TextView(this);
            title.setText(item_title[currenti]);
            title.setGravity(Gravity.CENTER);
            title.setTextColor(0xff212121);
            title.setPadding(dp(10), dp(0), dp(10), dp(0));
            title.setTypeface(null, Typeface.BOLD);
            title.setLayoutParams(title_lp);
            title.setBackgroundResource(R.drawable.borderradius2);
            title.setTextSize(fontpercent_screenheight(2.5));

            ImageView item = new ImageView(this);
            item.setImageResource(getResources().getIdentifier(item_image[i], "drawable", getPackageName()));
            item.setScaleType(ScaleType.FIT_CENTER);
            item.setAdjustViewBounds(true);
            item.setLayoutParams(image_lp);

            TextView desc = new TextView(this);
            desc.setText(item_shortdesc[currenti]);
            desc.setPadding(dp(10), dp(5), dp(10), dp(5));
            desc.setLayoutParams(desc_lp);
            desc.setTextSize(fontpercent_screenheight(2.5));

            TextView price = new TextView(this);
            price.setText(String.format(sign + "%.2f", Double.parseDouble(item_price[currenti])));
            price.setPadding(0, dp(5), dp(10), dp(5));
            price.setLayoutParams(price_rp);
            price.setTextSize(fontpercent_screenheight(2.5));

            buy = new TextView(this);
            buy.setText(R.string.MenuAddToOrderButton);
            buy.setPadding(dp(10), dp(5), 0, dp(5));
            buy.setTextColor(0xffff0000);
            buy.setLayoutParams(buy_rp);
            buy.setTextSize(fontpercent_screenheight(2.5));
            buy.setClickable(true);
            buy.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View v) {
                    addItemToOrder(currenti);
                }
            });
            buy.setOnTouchListener(new OnTouchListener() {
                @Override
                public boolean onTouch(View v, MotionEvent event) {
                    if (event.getAction() == MotionEvent.ACTION_DOWN) {
                        ((TextView) v).setTextColor(0xff212121);
                    } else if (event.getAction() == MotionEvent.ACTION_UP) {
                        ((TextView) v).setTextColor(0xffff0000);
                    }
                    return false;
                }
            });

            RelativeLayout bottom = new RelativeLayout(this);
            bottom.setLayoutParams(bottom_lp);
            bottom.addView(buy);
            bottom.addView(price);

            LinearLayout card = new LinearLayout(this);
            card.setOrientation(LinearLayout.VERTICAL);
            card.setLayoutParams(card_lp);
            card.setBackgroundResource(R.drawable.borderradius1);
            card.setWeightSum(1f);
            card.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View v) {
                    Intent intent = new Intent(context, ItemProfile.class).putExtra("item_image", getResources().getIdentifier(item_image[currenti], "drawable", getPackageName())).putExtra("item_title", item_title[currenti]).putExtra("item_desc", item_desc[currenti]).putExtra("item_price", Double.parseDouble(item_price[currenti]));
                    startActivity(intent);
                }
            });

            card.addView(title);
            card.addView(item);
            card.addView(desc);
            card.addView(bottom);

            menu.addView(card);
        }
    }
}

Answer 1

每当我开始看到循环创建手工创建视图的代码时，我通常会担心事情没有以最佳方式完成。再看看https://developer.android.com/guide/topics/ui/declaring-layout.html。您可能想要查看ListView，看起来您正在尝试手动构建一个。

有效地加载drawables而不是使用大量内存

1 个答案: