用Intent去调用一个类，不成功，log里多了一个 / ，为什么？
问题：我用Intent去调用一个类，却显示不出来，然后用System.out.println("aa-->>" + remoteIntent); 打印出来一看: aa-->>Intent { cmp=your.napo/.Mp3player } 多了一个“/” 这是为什么啊？
MainActivity.java代码：
package your.napo;
import android.app.TabActivity;
import android.content.Intent;
import android.content.res.Resources;
import android.os.Bundle;
import android.widget.TabHost;
public class MainActivity extends TabActivity{
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//得到一个TabHost对象，针对TabActivity的操作一般都由这个对象完成。
TabHost tabHost = getTabHost();
//生成一个Intent对象，指向一个Activity
Intent remoteIntent = new Intent();
remoteIntent.setClass(this, Mp3player.class);
//使用内部类,生成一个TabSpec对象，这个对象代表了一个页
TabHost.TabSpec remoteSpec = tabHost.newTabSpec("Remote");
//设置使用android内置图标
Resources res = getResources();
//设置该页的Indicator（指示器）
remoteSpec.setIndicator("Remote", res.getDrawable(android.R.drawable.stat_sys_download));
//设置该页内容
remoteSpec.setContent(remoteIntent);
System.out.println("aa-->>" + remoteIntent);
//将设置好的TabSpec对象添加到TabHost当中
tabHost.addTab(remoteSpec);
Intent localIntent = new Intent();
localIntent.setClass(this, LocalMp3player.class);
TabHost.TabSpec localSpec = tabHost.newTabSpec("Local");
localSpec.setIndicator("Local", res.getDrawable(android.R.drawable.stat_sys_upload));
localSpec.setContent(localIntent);
tabHost.addTab(localSpec);
}
}
Mp3player.java的代码：
package your.napo;
import java.io.StringReader;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import javax.xml.parsers.SAXParserFactory;
import napo.download.HttpDownload;
import napo.model.Mp3Info;
import napo.xml.Mp3ListContentHandler;
import org.xml.sax.InputSource;
import org.xml.sax.XMLReader;
import your.napo.service.DownloadService;
import android.app.ListActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ListView;
import android.widget.SimpleAdapter;
public class Mp3player extends ListActivity {
/** Called when the activity is first created. */
private static final int UPDATE = 1;
private static final int ABOUT = 2;
private List<Mp3Info> mp3Infos = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.remote_mp3_list);
updateListView();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// TODO Auto-generated method stub
menu.add(0, UPDATE, 1, R.string.mp3list_update);
menu.add(0, ABOUT, 2, R.string.mp3list_about);
return super.onCreateOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if (item.getItemId() == UPDATE) {
updateListView();
} else if (item.getItemId() == ABOUT) {
}
return super.onOptionsItemSelected(item);
}
private SimpleAdapter buildSimpleAdapter(List<Mp3Info> mp3Infos) {
//生成一个List对象，并按照SimpleAdapter的标准，讲mp3Infos当众的数据添加到List中
List<HashMap<String, String>> list = new ArrayList<HashMap<String, String>>();
for (Iterator iterator = mp3Infos.iterator(); iterator.hasNext();) {
Mp3Info mp3Info = (Mp3Info) iterator.next();
HashMap<String, String> map = new HashMap<String, String>();
map.put("mp3_name", mp3Info.getMp3Name());
map.put("mp3_size", mp3Info.getMp3Size());
list.add(map);
}
//创建一个SimpleAdapter对象
SimpleAdapter simpleAdapter = new SimpleAdapter(this, list, R.layout.mp3info_item,
new String[] { "mp3_name","mp3_size" },
new int[] { R.id.mp3_name,R.id.mp3_size });
return simpleAdapter;
}
//将更新列表所执行的程序封装起来
private void updateListView() {
//下载包含所有Mp3基本信息的xml文件
String xml = downloadXML("http://192.168.1.3:8080/mp3/resources.xml");
//对xml文件进行解析，并将解析的结果放置到Mp3Info对象当众，最后将这个Mp3Info对象放到List中
mp3Infos = parse(xml);
SimpleAdapter simpleAdapter = buildSimpleAdapter(mp3Infos);
//将这个SimpleAdapter对象设置到ListActivity中
setListAdapter(simpleAdapter);
}
private String downloadXML(String urlStr) {
HttpDownload httpDownload = new HttpDownload();
String result = httpDownload.download(urlStr);
return result;
}
private List<Mp3Info> parse(String xmlStr) {
SAXParserFactory saxParserFactory = SAXParserFactory.newInstance();
List<Mp3Info> infos = new ArrayList<Mp3Info>();
try {
XMLReader xmlReader = saxParserFactory.newSAXParser().getXMLReader();
Mp3ListContentHandler mp3ListContentHandler = new Mp3ListContentHandler(infos);
xmlReader.setContentHandler(mp3ListContentHandler);
xmlReader.parse(new InputSource(new StringReader(xmlStr)));
for (Iterator iterator = infos.iterator(); iterator.hasNext();) {
Mp3Info mp3Info = (Mp3Info) iterator.next();
System.out.println(mp3Info);
}
} catch (Exception e) {
e.printStackTrace();
}
return infos;
}
@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
//获得用户点击的按钮
Mp3Info mp3Info = mp3Infos.get(position);
Intent intent = new Intent();
//需要在Mp3Info类里实现序列化接口Serializable。
intent.putExtra("mp3Info", mp3Info);
intent.setClass(this, DownloadService.class);
startService(intent);
super.onListItemClick(l, v, position, id);
}
}
[解决办法]
/. 表示在当前包的目录下。
[解决办法]
调用不成功有没有出错日志，发详细日志上来看看
[解决办法]
your.napo/.Mp3player 表示Mp3player在your.napo文件下面，还有问题可以贴Logcat出来的，大家帮你看看
[解决办法]
就是指那个包下面的类呀
[解决办法]
从上面的日志只能看出您的程序太占资源，程序已经不响就了
[解决办法]
主要的问题应该是你程序中下载、调用网络这一部份超时导致的，建议将这部份代码放到Thread里面去。
