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我在我的android應用程序中有一個ListView，它非常滯後。我在ListView中有一些圖像，它們非常大，所以這可能就是問題所在。但我需要他們變大，所以我想知道是否有什麼我可以做的，以保持他們大，沒有得到所有的滯後？希望你能理解。這是我的代碼。ListView中的延遲
package com.xxx.xxx;
import java.util.List;
import java.util.Vector;
import com.xxx.xxx.R;
import android.app.Activity;
import android.app.ListActivity;
import android.content.Context;
import android.content.Intent;
import android.net.ParseException;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
public class MainActivity extends ListActivity {
private LayoutInflater mInflater;
private Vector<RowData> data;
RowData rd;
public static final String[] title = new String[] {
"IMPROSCENE",
"RASMUS WALTER",
"VIL DU STUDERE I UDLANDET?",
"INDIANS",
"BAZAR’O’RAMA",
"ON AIR FESTIVAL",
"DEN SORTE SKOLE",
"THE FLOOR IS MADE OF LAVA",
"The Punch Comedy Club",
"HIGHASAKITE (N)",
"SLIM CESSNA'S AUTO CLUB (US)",
"MARIE KEY",
"WOA Metal Battle Tour",
"FRITZ KALKBRENNER",
"BARBARA MOLEKO",
"WHEN SAINTS GO MACHINE",};
public static final String[] detail = new String[] {
"Tir 09/04 KL. 20:00 \nGratis Adgang",
"Tor 11/04 KL. 21:00 \nEntré: Kr. 135 + evt. gebyr",
"Tor 11/04 KL. 13:00 \nGratis Adgang",
"Fre 12/04 KL. 21:00 \nEntré: Kr. 80 + evt. gebyr",
"Søn 14/04 KL. 11:00 \nGratis Adgang",
"Lør 20/04 KL. 15:00 \nGratis Adgang",
"Tor 25/04 KL. 21:00 \nEntré: Kr. 130 + evt. gebyr",
"Lør 27/04 KL. 21:00 \nEntré: Kr. 140 + evt. gebyr",
"Tir 30/04 KL. 20:00 \nGratis Adgang",
"Tor 02/05 KL. 21:00 \nEntré: Kr. 80 + evt. gebyr",
"Fre 03/05 KL. 22:00 \nEntré: Kr. 70 + evt. gebyr",
"Lør 04/05 KL. 21:00 \nEntré: Kr. 130 + evt. gebyr",
"Fre 10/05 KL. 21:00 \nEntré: Kr. 75 + evt. gebyr",
"Lør 25/05 KL. 22:00 \nEntré: Kr. 100 + evt. gebyr",
"Fre 13/09 KL. 21:00 \nEntré: Kr. 110 + evt. gebyr",
"Lør 12/10 KL. 21:00 \nEntré: Kr. 140 + evt. gebyr",};
public static Integer[] imgid = {
R.drawable.1, R.drawable.2,
R.drawable.3, R.drawable.4,
R.drawable.5, R.drawable.6,
R.drawable.7, R.drawable.8,
R.drawable.9, R.drawable.10,
R.drawable.11, R.drawable.12,
R.drawable.13, R.drawable.14,
R.drawable.15, R.drawable.16,
R.drawable.17, R.drawable.18,
R.drawable.19, R.drawable.20,
};
public static final String[] footer = new String[] {
"\nTEXT",
"\nTEXT",
"\nTEXT",
"\nTEXT,
"\nTEXT",
"\nTEXT",
"\nTEXT",
"\nTEXT,
"\nTEXT",
"\nTEXT",
"\nTEXT",
"\nTEXT,
"\nTEXT",
"\nTEXT",
"\nTEXT",
"\nTEXT,
};
@Override
public void onCreate(Bundle savedInstanceState) {
requestWindowFeature(Window.FEATURE_NO_TITLE);
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mInflater = (LayoutInflater) getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
data = new Vector<RowData>();
for (int i = 0; i < title.length; i++) {
try {
rd = new RowData(i, title[i], detail[i]);
} catch (ParseException e) {
e.printStackTrace();
}
data.add(rd);
}
CustomAdapter adapter = new CustomAdapter(this, R.layout.list_item, R.id.title, data);
setListAdapter(adapter);
getListView().setTextFilterEnabled(true);
}
public void onListItemClick(ListView parent, View v, int position, long id) {
Intent intent = new Intent(this, NewActivity.class);
intent.putExtra("position", position);
startActivity(intent);
}
private class RowData {
protected int mId;
protected String mTitle;
protected String mDetail;
RowData(int id, String title, String detail) {
mId = id;
mTitle = title;
mDetail = detail;
}
@Override
public String toString() {
return mId + " " + mTitle + " " + mDetail;
}
}
private class CustomAdapter extends ArrayAdapter<RowData> {
public CustomAdapter(Context context, int resource,
int textViewResourceId, List<RowData> objects) {
super(context, resource, textViewResourceId, objects);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
TextView title = null;
TextView detail = null;
ImageView i11 = null;
RowData rowData = getItem(position);
if (null == convertView) {
convertView = mInflater.inflate(R.layout.list_item, null);
holder = new ViewHolder(convertView);
convertView.setTag(holder);
}
holder = (ViewHolder) convertView.getTag();
title = holder.gettitle();
title.setText(rowData.mTitle);
detail = holder.getdetail();
detail.setText(rowData.mDetail);
i11 = holder.getImage();
i11.setImageResource(imgid[rowData.mId]);
return convertView;
}
private class ViewHolder {
private View mRow;
private TextView title = null;
private TextView detail = null;
private ImageView i11 = null;
public ViewHolder(View row) {
mRow = row;
}
public TextView gettitle() {
if (null == title) {
title = (TextView) mRow.findViewById(R.id.title);
}
return title;
}
public TextView getdetail() {
if (null == detail) {
detail = (TextView) mRow.findViewById(R.id.detail);
}
return detail;
}
public ImageView getImage() {
if (null == i11) {
i11 = (ImageView) mRow.findViewById(R.id.img);
}
return i11;
}
}
}
}
你必須遵循android.used圖像大小設計的指導方針基於屏幕大小，如mdpi，ldpi，hdpi.u無法使用大圖像時，它可能不正確，當你看到它在設備上。 –
你可以發佈你的設計代碼..那就是我們需要關注的部分。 – itsrajesh4uguys