Android读写文件

package com.niu.readfile; import java.io.File; import java.io.FilenameFilter; import java.util.ArrayList; import android.app.Activity; import android.app.AlertDialog; import android.content.DialogInterface; import android.os.Bundle; import android.view.View; import android.view.ViewGroup; import android.view.View.OnClickListener; import android.widget.ArrayAdapter; import android.widget.BaseAdapter; import android.widget.Button; import android.widget.EditText; import android.widget.ListView; public class Readallchecklisttxt extends Activity{ String[] fname; ListView list; private StringBuffer contactValue; EditText et; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.mainallchecklisttxt); et = (EditText) findViewById(R.id.EditText_alltxt); Button btntest = (Button) findViewById(R.id.Button_test); btntest.setOnClickListener(ltest); Button btnok = (Button) findViewById(R.id.Button_ok); btnok.setOnClickListener(lok); Button btnadd = (Button) findViewById(R.id.Button_add); btnadd.setOnClickListener(ladd); list = (ListView) findViewById(R.id.list); } OnClickListener ltest = new OnClickListener() { @Override public void onClick(View v) { showTxtNameDialog(); } }; OnClickListener lok = new OnClickListener() { @Override public void onClick(View v) { File path=new File("/data/data/com.niu.readfile/files/"); // 获取目录内所有.txt结尾的文件名字 fname=path.list(new FilenameFilter(){ public boolean accept(File dir, String name) { if(name!=null&&name.endsWith(".txt")) return true; else return false; } }); list.setAdapter(new ArrayAdapter<String>(Readallchecklisttxt.this, android.R.layout.simple_list_item_multiple_choice, fname)); //list.setItemsCanFocus(true); list.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE); } }; OnClickListener ladd = new OnClickListener() { boolean ischecked; @Override public void onClick(View v) { // TODO Auto-generated method stub for (int i = 0; i < fname.length; i++) { if (ischecked) { et.append(fname[i]); } } } }; private void showTxtNameDialog() { File path=new File("/data/data/com.niu.readfile/files/"); // 获取目录内所有.txt结尾的文件名字 final String[] fname=path.list(new FilenameFilter(){ public boolean accept(File dir, String name) { if(name!=null&&name.endsWith(".txt")) return true; else return false; } }); final boolean[] checkedItems = new boolean[fname.length]; for (int i = 0; i < fname.length; i++) { checkedItems[i] = false; } new AlertDialog.Builder(this).setCancelable(false) .setTitle("选择要选中的文本(多选)")//.setIcon(R.drawable.mq) .setMultiChoiceItems(fname, checkedItems, new DialogInterface.OnMultiChoiceClickListener() { public void onClick(DialogInterface dialog, int which, boolean isChecked) { contactValue = new StringBuffer(); if(isChecked){ checkedItems[which] = true; } for(int i=0;i<checkedItems.length;i++){ if(checkedItems[i] == true){ String[] itemValue = fname[i].split(":"); contactValue.append(itemValue[0]).append(","); } } if(contactValue.length()>0){ contactValue.deleteCharAt(contactValue.length()-1); } et.setText(contactValue.toString()); } }).setPositiveButton("确认", new DialogInterface.OnClickListener() { public void onClick( DialogInterface dialoginterface, int i) { dialoginterface.dismiss(); } }).show(); } }