Android文件操作放到listview中

package abc.test;import java.io.BufferedReader;//import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.InputStreamReader;import java.io.OutputStreamWriter;import java.util.ArrayList;import java.util.List;import android.app.Activity;import android.os.Bundle;//import android.os.Environment;import android.widget.ArrayAdapter;import android.widget.ListView;public class FileIOActivity extends Activity {private ListView listView = null;private List<String> listStr = new ArrayList<String>();@Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState);// setContentView(R.layout.main); WriteFile(); ReadFile(); listView = new ListView(this); listView.setAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_expandable_list_item_1, listStr)); setContentView(listView); }private void WriteFile(){try {FileOutputStream fos = openFileOutput("myText.txt", MODE_PRIVATE);OutputStreamWriter osw = new OutputStreamWriter(fos);osw.write("zhangsan/n");osw.write("lisi/n");osw.write("wangwu/n");osw.write("zhengxin/n");osw.write("xiaoquan/n");osw.write("lihuaye/n");osw.close();}catch(Exception e){e.printStackTrace();}}private void ReadFile(){try {//File sdcardPath = Environment.getExternalStorageDirectory();FileInputStream fis = openFileInput("myText.txt");InputStreamReader isr = new InputStreamReader(fis);BufferedReader br = new BufferedReader(isr);String line;while((line = br.readLine()) != null){listStr.add(line);}} catch (Exception e) {e.printStackTrace();}}}