大家。我尝试使用 a viewholder adapter，但我无法理解并且我的应用程序停止工作。我需要一些帮助。我读了一些解释这一点的博客。没有成功。
这是我下面的代码，我只想如何使用viewholder adapter我的列表视图中的 a 或其他东西来修改它，它可以正常工作，没有延迟。我更具视觉效果，如果有人使用我的代码举例，我将不胜感激。PS：我的 Listview 有 100 多个项目，但我只是在此处进行了缩减，以澄清和方便查看我的代码。
public class Listagem extends Activity {
EditText edittext;
ListView listview;
String[] text;
String[] text2;
int[] image = {
R.drawable.wolf;
R.drawable.cat;
};
int textlength = 0;
ArrayList<String> text_sort = new ArrayList<String>();
ArrayList<String> text2_sort = new ArrayList<String>();
ArrayList<Integer> image_sort = new ArrayList<Integer>();
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.main);
text = getResources().getStringArray(R.array.text);
text2 = getResources().getStringArray(R.array.text2);
edittext = (EditText) findViewById(R.id.EditText01);
listview = (ListView) findViewById(R.id.ListView01);
listview.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> arg0, View arg1, int position, long arg3) {
if ("Howl".equals(text[position])) {
MediaPlayer player = MediaPlayer.create(Listagem.this, R.raw.howl);
player.start();
}
if ("Meow".equals(text[position])) {
MediaPlayer player = MediaPlayer.create(Listagem.this, R.raw.meow);
player.start();
}
}
});
listview.setAdapter(new MyCustomAdapter(text, text2, image));
edittext.addTextChangedListener(new TextWatcher() {
public void afterTextChanged(Editable s) {
}
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
public void onTextChanged(CharSequence s, int start, int before, int count) {
textlength = edittext.getText().length();
text_sort.clear();
text2_sort.clear();
image_sort.clear();
for (int i = 0; i < text.length; i++) {
if (textlength <= text[i].length()) {
if (edittext.getText().toString().equalsIgnoreCase((String) text[i].subSequence(0, textlength))) {
text_sort.add(text[i]);
text2_sort.add(text2[i]);
image_sort.add(image[i]);
}
}
}
listview.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> arg0, View arg1, int position, long arg3) {
if ("Howl".equals(text_sort.get(position))) {
MediaPlayer player = MediaPlayer.create(Listagem.this, R.raw.howl);
player.start();
}
if ("Meow".equals(text_sort.get(position))) {
MediaPlayer player = MediaPlayer.create(Listagem.this, R.raw.meow);
player.start();
}
}
});
listview.setAdapter(new MyCustomAdapter(text_sort, text2_sort, image_sort));
}
});
}
class MyCustomAdapter extends BaseAdapter {
String[] data_text;
String[] data_text2;
int[] data_image;
MyCustomAdapter() {
}
MyCustomAdapter(String[] text, String[] text2, int[] image) {
data_text = text;
data_text2 = text2;
data_image = image;
}
MyCustomAdapter(ArrayList<String> text, ArrayList<String> text2, ArrayList<Integer> image) {
data_text = new String[text.size()];
data_text2 = new String[text2.size()];
data_image = new int[image.size()];
for(int i=0;i<text.size();i++) {
data_text[i] = text.get(i);
data_text2[i] = text2.get(i);
data_image[i] = image.get(i);
}
}
public int getCount() {
return data_text.length;
}
public String getItem(int position) {
return null;
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater inflater = getLayoutInflater();
View row;
row = inflater.inflate(R.layout.listview, parent, false);
listview.setCacheColorHint(Color.TRANSPARENT);
listview.setFastScrollEnabled(true);
listview.setScrollingCacheEnabled(false);
TextView textview = (TextView) row.findViewById(R.id.TextView01);
TextView textview2 = (TextView) row.findViewById(R.id.TextView02);
Typeface font1 = Typeface.createFromAsset(getAssets(), "arial.ttf");
textview2.setTypeface(font1);
ImageView imageview = (ImageView) row.findViewById(R.id.ImageView01);
textview.setText(data_text[position]);
textview2.setText(data_text2[position]);
imageview.setImageResource(data_image[position]);
return row;
}
}
}