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我到目前爲止所做的是檢測mp3文件，並在lisview中用複選框顯示它，我的問題是我檢查了項目並向下滾動，之前檢查的項目丟失了。android：listview中的複選框
這是我的代碼：
這是適配器
package com.example.cameraapp;
import android.app.Activity;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.CheckBox;
import android.widget.TextView;
public class CustomAdapter extends ArrayAdapter<Model>{
Model[] modelItems = null;
Context context;
public CustomAdapter(Context context, Model[] resource) {
super(context,R.layout.songlayout,resource);
// TODO Auto-generated constructor stub
this.context = context;
this.modelItems = resource;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
LayoutInflater inflater = ((Activity)context).getLayoutInflater();
convertView = inflater.inflate(R.layout.songlayout, parent, false);
TextView name = (TextView) convertView.findViewById(R.id.songsTexView);
CheckBox cb = (CheckBox) convertView.findViewById(R.id.checkBox1);
name.setText(modelItems[position].getName());
if(modelItems[position].getValue() == 1)
cb.setChecked(true);
else
cb.setChecked(false);
return convertView;
}
}
，這是在MainActivity
package com.example.cameraapp;
import java.io.File;
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.content.Context;
import android.content.ContextWrapper;
import android.os.Bundle;
import android.os.Environment;
import android.view.Menu;
import android.widget.ListView;
public class FinalChoice extends Activity {
ListView lv;
int chuba=0;
Model[] modelItems;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.listview1hold);
lv = (ListView) findViewById(R.id.listView1);
String mp3Directory = "/Music";
String directoryPath= Environment.getExternalStorageDirectory().getAbsolutePath()+mp3Directory;
List<File> list = getMP3Files(directoryPath);
modelItems = new Model[list.size()];
//print in LogCat the list of .mp3:
for(int a=0;a<list.size();a++){
modelItems[a]=new Model(list.get(a).getName(), 0);
}
CustomAdapter adapter = new CustomAdapter(this, modelItems);
lv.setAdapter(adapter);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
public List<File> getMP3Files(String directory) {
List<File> files = new ArrayList<File>();
File folder = new File(directory);
for (File file : folder.listFiles()) {
if (file.isFile()) {
if (file.getName().endsWith(".mp3") || file.getName().endsWith(".MP3")) {
files.add(file);
}
}
}
return files;
}
}