0
我需要使用getView（）方法的自定義適配器的幫助。當適配器在每次像holder.textEpisode.setTextColor()等渲染的getView（）方法中創建一個列表時，這會產生沉重的負載，並且列表開始減慢。
請幫我解決這個問題。謝謝！自定義ListView + getView方法
public class myAdapterDouble extends ArrayAdapter<Order> {
private int[] colorWhite = new int[] { -0x1 };
private int[] colors = new int[] { -0x1, -0x242425 };
private int[] colorBlack = new int[] { -0x1000000 };
private int[] colorTransparent = new int[] { android.R.color.transparent };
private LayoutInflater lInflater;
private ArrayList<Order> data;
private Order o;
private DisplayImageOptions options;
private ImageLoader imageLoader;
private ImageLoaderConfiguration config;
private Context ctx;
private Typeface tf;
public myAdapterDouble(Context c, int listItem, ArrayList<Order> data) {
super(c, listItem, data);
lInflater = LayoutInflater.from(c);
this.data = data;
ctx = c;
tf = Typeface.createFromAsset(ctx.getAssets(), "meiryo.ttc");
imageLoader = ImageLoader.getInstance();
options = new DisplayImageOptions.Builder()
.showStubImage(R.drawable.no_image)
.showImageForEmptyUri(R.drawable.no_image).cacheOnDisc()
.cacheInMemory().build();
config = new ImageLoaderConfiguration.Builder(c.getApplicationContext())
.threadPriority(Thread.NORM_PRIORITY - 2)
.memoryCacheSize(2 * 1024 * 1024) // 2 Mb
.memoryCacheExtraOptions(100, 100)
.denyCacheImageMultipleSizesInMemory()
.discCacheFileNameGenerator(new Md5FileNameGenerator())
.tasksProcessingOrder(QueueProcessingType.LIFO).enableLogging()
.build();
ImageLoader.getInstance().init(config);
}
SharedPreferences sharedPref;
boolean posters, fixFont;
float headerSize, timeSize, dateSize;
int imageWSize;
public View getView(final int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
o = data.get(position);
sharedPref = PreferenceManager.getDefaultSharedPreferences(ctx);
posters = sharedPref.getBoolean("poster", true);
fixFont = sharedPref.getBoolean("fix_font", false);
if (convertView == null) {
convertView = lInflater.inflate(R.layout.double_list_item, null);
holder = new ViewHolder();
holder.textName = (TextView) convertView.findViewById(R.id.text);
if (fixFont) {
try {
holder.textName.setTypeface(tf);
} catch (Exception e) {
Toast.makeText(ctx, e.toString(), Toast.LENGTH_SHORT).show();
}
} else {
try {
holder.textName.setTypeface(Typeface.DEFAULT);
} catch (Exception e) {
Toast.makeText(ctx, e.toString(), Toast.LENGTH_SHORT).show();
}
}
holder.textEpisode = (TextView) convertView.findViewById(R.id.text2);
holder.img = (ImageView) convertView.findViewById(R.id.image);
String width = sharedPref.getString("image_width", "70");
imageWSize = Integer.parseInt(width); // ширина
final float scale = getContext().getResources().getDisplayMetrics().density;
int px = (int) (imageWSize*scale + 0.5f);
holder.img.getLayoutParams().height = LayoutParams.WRAP_CONTENT;
holder.img.getLayoutParams().width = px;
if(imageWSize == 0) {
holder.img.getLayoutParams().width = LayoutParams.WRAP_CONTENT;
}
holder.img.setPadding(5, 5, 5, 5);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
headerSize = Float.parseFloat(sharedPref.getString("headsize", "20"));
holder.textName.setTextSize(headerSize); // размер названия
timeSize = Float.parseFloat(sharedPref.getString("timesize", "15"));
holder.textEpisode.setTextSize(timeSize); // размер времени
if (posters) {
holder.img.setVisibility(View.VISIBLE);
try {
imageLoader.displayImage(o.getLink(), holder.img, options);
} catch (NullPointerException e) {
e.printStackTrace();
}
} else {
holder.img.setVisibility(View.GONE);
}
holder.img.setTag(o);
holder.textName.setText(o.getTextName());
holder.textEpisode.setText(o.getTextEpisode());
holder.textEpisode.setTextColor(Color.BLACK);
if (o.getTextEpisode().toString().contains(ctx.getString(R.string.final_ep))) {
String finaleColor = sharedPref.getString("finale_color", "1");
if (finaleColor.contains("default")) {
holder.textEpisode.setTextColor(Color.parseColor("#2E64FE"));
}
if (finaleColor.contains("yelow")) {
holder.textEpisode.setTextColor(Color.YELLOW);
}
if (finaleColor.contains("red")) {
holder.textEpisode.setTextColor(Color.RED);
}
if (finaleColor.contains("green")) {
holder.textEpisode.setTextColor(Color.GREEN);
}
if (finaleColor.contains("white")) {
holder.textEpisode.setTextColor(Color.WHITE);
}
if (finaleColor.contains("gray")) {
holder.textEpisode.setTextColor(Color.GRAY);
}
} else {
holder.textEpisode.setTextColor(Color.parseColor("#2E64FE"));
}
String chooseColor = sharedPref.getString("colorList", "");
if (chooseColor.contains("white")) {
int colorPos = position % colorWhite.length;
convertView.setBackgroundColor(colorWhite[colorPos]);
}
if (chooseColor.contains("black")) {
int colorPos = position % colorBlack.length;
convertView.setBackgroundColor(colorBlack[colorPos]);
holder.textName.setTextColor(Color.parseColor("#FFFFFF"));
}
if (chooseColor.contains("whitegray")) {
int colorPos = position % colors.length;
convertView.setBackgroundColor(colors[colorPos]);
}
if (chooseColor.contains("transparent")) {
int colorPos = position % colorTransparent.length;
convertView.setBackgroundColor(colorTransparent[colorPos]);
}
return convertView;
}
這是Listview的行爲，以回收視圖，以節省內存。 Listview實現了大量的回收機制。它會爲當前可見的項目分配內存，所以每次都會調用getView（） – Pragnani 2013-04-08 05:35:25
可以以某種方式解決這個問題？ – 2013-04-08 05:37:25
您需要使用帶有滾動視圖的LinearLayout，但是當列表太大時它會導致內存問題 – Pragnani 2013-04-08 05:39:20