接着android 中导出数据 一文，下面介绍在android中导入数据的思路：
1、将数据从文本中读取出来
2、封装处理成自己想要的对象或模型
3、将处理好的数据对象插入自己应用的数据库中
4、更新UI显示
下面仍以导入联系人至系统中为例，若是导入自己的应用中，思路一样甚至更简单，代码如下：
注：我的联系人.txt的格式即为android 中导出数据 一文生成的格式
MainActivity：
package com.home.impcontact;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.ArrayList;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.ContentUris;
import android.content.ContentValues;
import android.content.Context;
import android.content.DialogInterface;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.os.Message;
import android.provider.ContactsContract;
import android.provider.ContactsContract.RawContacts;
import android.provider.ContactsContract.CommonDataKinds.Phone;
import android.provider.ContactsContract.CommonDataKinds.StructuredName;
import android.provider.ContactsContract.Contacts.Data;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends Activity implements OnClickListener {
private Button btn;// 导入按钮
private TextView show;// 显示结果的文本框
private Thread addThread;// 增加联系人线程
private static final int ADD_FAIL = 0;// 导入失败标识
private static final int ADD_SUCCESS = 1;// 导入成功标识
private static int successCount = 0;// 导入成功的计数
private static int failCount = 0;// 导入失败的计数
// 默认文件路劲，实际情况应作相应修改或从界面输入或浏览选择
private static final String PATH = Environment
.getExternalStorageDirectory() + "/我的联系人.txt";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
init();
}
/**
* 初始化组件
*/
private void init() {
btn = (Button) findViewById(R.id.main_btn);
btn.setOnClickListener(this);
show = (TextView) findViewById(R.id.main_tv);
}
@Override
public void onClick(View v) {
if (v == btn) {
addContact();
}
}
/**
* 导入联系人入口
*/
private void addContact() {
if (!new File(PATH).exists()) {
Toast.makeText(this, "文件不存在!", Toast.LENGTH_SHORT).show();
show.setText("文件不存在!");
return;
}
if (addThread != null) {
addThread.interrupt();
addThread = null;
}
addThread = new Thread(new AddRunnable(this, PATH));
createDialog(this, "警告", "确保你是第一次导入，重复导入会创建新的联系人，请慎用！");
}
/**
* 创建提示对话框
*
* @param context
* @param title
* @param message
*/
private void createDialog(Context context, String title, String message) {
AlertDialog.Builder builder = new AlertDialog.Builder(context);
builder.setTitle(title);
builder.setMessage(message);
builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
startAddContact();
}
});
builder.setNeutralButton("取消", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
dialog.cancel();
}
});
builder.show();
}
/**
* 开启导入线程
*/
private void startAddContact() {
setAddWidgetEnabled(false);
show.setText("正在导入联系人...");
if (addThread != null) {
addThread.start();
}
}
class AddRunnable implements Runnable {
private Context context;
private String path;
public AddRunnable(Context context, String path) {
this.path = path;
this.context = context;
}
@Override
public void run() {
boolean result = importContact(context, path);
if (result) {
handler.sendEmptyMessage(ADD_SUCCESS);
} else {
handler.sendEmptyMessage(ADD_FAIL);
}
}
}
/**
* 处理UI相关的handler
*/
private Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case ADD_FAIL:
show.setText("导入联系人失败");
setAddWidgetEnabled(true);
break;
case ADD_SUCCESS:
show.setText(String.format("导入联系人成功 %d 条，失败 %d 条",
successCount, failCount));
setAddWidgetEnabled(true);
break;
}
}
};
/**
* 设置导入组件的可用性
*
* @param enabled
*/
private void setAddWidgetEnabled(boolean enabled) {
btn.setEnabled(enabled);
if (!enabled) {
show.setText("");
}
}
/**
* 导入联系人
*
* @param context
* @param path
* @return
*/
private boolean importContact(Context context, String path) {
successCount = 0;
failCount = 0;
try {
ArrayList<ContactInfo> list = readFromFile(path);
if (list == null) {
return false;
}
for (int i = 0; i < list.size(); i++) {
ContactInfo info = list.get(i);
if (doAddContact(context, info)) {
successCount++;
}
}
} catch (Exception e) {
e.printStackTrace();
return false;
}
return true;
}
/**
* 读取联系人并封装成ContactInfo对象集合
*
* @param path
* @return contactsList
*/
private ArrayList<ContactInfo> readFromFile(String path) {
ArrayList<String> strsList = doReadFile(path);
if (strsList == null) {
return null;
}
ArrayList<ContactInfo> contactsList = handleReadStrs(strsList);
return contactsList;
}
/**
* 将读出来的内容封装成ContactInfo对象集合
*
* @param strsList
* @return
*/
private ArrayList<ContactInfo> handleReadStrs(ArrayList<String> strsList) {
ArrayList<ContactInfo> contactsList = new ArrayList<ContactInfo>();
for (int i = 0; i < strsList.size(); i++) {
String info = strsList.get(i);
String[] infos = info.split("\\s{2,}");
String displayName = null;
String mobileNum = null;
String homeNum = null;
switch (infos.length) {
case 0:
continue;
case 1:
displayName = infos[0];
break;
case 2:
displayName = infos[0];
if (infos[1].length() >= 11) {
mobileNum = infos[1];
} else {
homeNum = infos[1];
}
break;
default:
// length >= 3
displayName = infos[0];
mobileNum = infos[1];
homeNum = infos[2];
}
if (displayName == null || "".equals(displayName)) {
failCount++;
continue;
}
contactsList.add(new ContactInfo(displayName, mobileNum, homeNum));
}
return contactsList;
}
/**
* 读取文件内容
*
* @param path
* @return
*/
private ArrayList<String> doReadFile(String path) {
FileInputStream in = null;
ArrayList<String> arrayList = new ArrayList<String>();
try {
byte[] tempbytes = new byte[1 << 24];
in = new FileInputStream(path);
while (in.read(tempbytes) != -1) {
int length = 0;
int first = length;
for (int i = 0; i < tempbytes.length; i++) {
if (tempbytes[i] == ‘\n‘) {
length = i;
byte[] nowBytes = new byte[length - first];
System.arraycopy(tempbytes, first, nowBytes, 0, length
- first);
arrayList.add(new String(nowBytes, "utf-8").trim());
first = i + 1;
}
}
}
} catch (Exception e1) {
return null;
} finally {
if (in != null) {
try {
in.close();
} catch (IOException e1) {
return null;
}
}
}
return arrayList;
}
/**
* 向数据库表插入联系人信息
*
* @param context
* @param contactInfo
* @return
*/
private boolean doAddContact(Context context, ContactInfo contactInfo) {
try {
ContentValues contentValues = new ContentValues();
Uri uri = context.getContentResolver().insert(
RawContacts.CONTENT_URI, contentValues);
long rowId = ContentUris.parseId(uri);
String name = contactInfo.getDisplayName();
String mobileNum = contactInfo.getMobileNum();
String homeNum = contactInfo.getHomeNum();
// 插入姓名
if (name != null) {
contentValues.clear();
contentValues.put(Data.RAW_CONTACT_ID, rowId);
contentValues.put(Data.MIMETYPE,
StructuredName.CONTENT_ITEM_TYPE);
int index = name.length() / 2;
String displayName = name;
String givenName = null;
String familyName = null;
// 检查是否是英文名称
if (checkEnglishName(displayName) == false) {
givenName = name.substring(index);
familyName = name.substring(0, index);
} else {
givenName = familyName = displayName;
}
contentValues.put(StructuredName.DISPLAY_NAME, displayName);
contentValues.put(StructuredName.GIVEN_NAME, givenName);
contentValues.put(StructuredName.FAMILY_NAME, familyName);
context.getContentResolver().insert(
ContactsContract.Data.CONTENT_URI, contentValues);
}
if (mobileNum != null) {
// 插入手机电话
contentValues.clear();
contentValues.put(Data.RAW_CONTACT_ID, rowId);
contentValues.put(Data.MIMETYPE, Phone.CONTENT_ITEM_TYPE);
contentValues.put(Phone.NUMBER, mobileNum);
contentValues.put(Phone.TYPE, Phone.TYPE_MOBILE);
context.getContentResolver().insert(
ContactsContract.Data.CONTENT_URI, contentValues);
}
if (homeNum != null) {
// 插入家庭号码
contentValues.clear();
contentValues.put(Data.RAW_CONTACT_ID, rowId);
contentValues.put(Data.MIMETYPE, Phone.CONTENT_ITEM_TYPE);
contentValues.put(Phone.NUMBER, homeNum);
contentValues.put(Phone.TYPE, Phone.TYPE_HOME);
context.getContentResolver().insert(
ContactsContract.Data.CONTENT_URI, contentValues);
}
} catch (Exception e) {
return false;
}
return true;
}
/**
* 检查是否是英文名称
*
* @param name
* @return
*/
private boolean checkEnglishName(String name) {
char[] nameChars = name.toCharArray();
for (int i = 0; i < nameChars.length; i++) {
if ((nameChars[i] >= ‘a‘ && nameChars[i] <= ‘z‘)
|| (nameChars[i] >= ‘A‘ && nameChars[i] <= ‘Z‘)) {
continue;
}
return false;
}
return true;
}
}
联系人实体类ContactInfo：
package com.home.impcontact;
public class ContactInfo {
/** 名称 */
private String displayName;
/** 手机号 */
private String mobileNum;
/** 家庭电话 */
private String homeNum;
public ContactInfo(String displayName, String mobileNum, String homeNum) {
this.displayName = displayName;
this.mobileNum = mobileNum;
this.homeNum = homeNum;
}
public String getDisplayName() {
return displayName;
}
public String getMobileNum() {
return mobileNum;
}
public String getHomeNum() {
return homeNum;
}
}
布局文件：
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<Button
android:id="@+id/main_btn"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="导入联系人" />
<TextView
android:id="@+id/main_tv"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
权限：
<uses-permission android:name="android.permission.READ_CONTACTS" /> <uses-permission android:name="android.permission.WRITE_CONTACTS" /> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />