Android实验二实验报告

Android实验报告二

姓名：丁军峰 班级：信科12-3 学号：08123448

一、 实验内容

备份通讯录联系人app

二、 实验源程序

1.Activity—main Xml

xmlns:android=\ xmlns:tools=\ android:layout_width=\ android:layout_height=\ android:orientation=\

android:layout_height=\ android:layout_width=\ android:orientation=\ >

android:id=\

android:layout_height=\ android:layout_width=\ android:layout_weight=\ android:text=\查询\ android:padding=\ >

android:textColor=\

android:background=\

/>

android:id=\

android:layout_height=\ android:layout_width=\ android:layout_weight=\ android:text=\保存\ android:padding=\

android:textColor=\

android:background=\

/>

android:id=\

android:layout_width=\ android:layout_height=\ >

2.MainActivity

package com.example.secondhomework;

import java.io.File;

import java.io.FileOutputStream; import java.io.IOException; import java.util.ArrayList; import java.util.List;

import org.xmlpull.v1.XmlSerializer; import android.app.Activity;

import android.content.ContentResolver; import android.database.Cursor; import android.net.Uri; import android.os.Bundle; import android.util.Xml; import android.view.View;

import android.view.View.OnClickListener; import android.widget.ArrayAdapter; import android.widget.Button; import android.widget.ListView; import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener{

private ListView myListView; private Button btQuery, btSave;

private ArrayAdapter myArrayAdapter; private List myList; String name,number;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState); setContentView(R.layout.activity_main);

myListView = (ListView) findViewById(R.id.lv);

}

btQuery = (Button) findViewById(R.id.bt_query); btSave = (Button) findViewById(R.id.bt_save);

myList = new ArrayList();

myArrayAdapter = new ArrayAdapter(this, android.R.layout.simple_list_item_1, myListView.setAdapter(myArrayAdapter);

btQuery.setOnClickListener(this); btSave.setOnClickListener(this);

myList);

@Override

public void onClick(View v) {

switch (v.getId()) { case R.id.bt_query:

myList.clear(); query();

myArrayAdapter.notifyDataSetChanged(); break;

if(myList.isEmpty()) query();

XmlSerializer serializer = Xml.newSerializer(); try {

File file = new File(this.getFilesDir(), \FileOutputStream fos = new FileOutputStream(file); serializer.setOutput(fos, \serializer.startDocument(\serializer.startTag(null, \for (int i = 0; i < myList.size(); i++) { }

serializer.endTag(null, \serializer.endDocument();

String str = myList.get(i); serializer.startTag(null, \serializer.startTag(null, \

serializer.text(str.substring(0, str.indexOf(\serializer.endTag(null, \

serializer.startTag(null, \

serializer.text(str.substring(str.indexOf(\serializer.endTag(null, \serializer.endTag(null, \

case R.id.bt_save:

}

}

}

}

fos.close();

Toast.makeText(this, \保存成功\e.printStackTrace();

Toast.makeText(this, \保存失败\

}catch (IOException e) {

break;

private void query() { }

ContentResolver myResolver = getContentResolver();

Uri uri = Uri.parse(\Uri dataUri = Uri.parse(\

Cursor cursor = myResolver.query(uri, null, null, null, null); while(cursor.moveToNext()){ }

cursor.close();

String id = cursor.getString(cursor.getColumnIndex(\

Cursor dataCursor = myResolver.query(dataUri, null, \while (dataCursor.moveToNext()) { }

dataCursor.close();

myList.add(name+\

String data1 = dataCursor.getString(dataCursor.getColumnIndex(\String mimetype =

if(mimetype.equals(\

name = data1; number = data1;

else if(mimetype.equals(\

String[]{id}, null);

dataCursor.getString(dataCursor.getColumnIndex(\

4.Manifest