详解Android的网络数据存储

一、网络保存数据介绍

可以使用网络来保存数据，在需要的时候从网络上获取数据，进而显示在App中。

用网络保存数据的方法有很多种，对于不同的网络数据采用不同的上传与获取方法。

本文利用LeanCloud来进行网络数据的存储。

LeanCloud是一种简单高效的数据和文件存储服务。感兴趣的可以查看网址：https://leancloud.cn/。关于LeanCloud的数据存储使用方法可以在里面找到，本文不讲述关于LeanCloud的使用，知识借助LeanCloud平台举一个在网络上存储数据的例子。

二、使用方法

1.上传数据

AVObject personObject = new AVObject(TABLENAME);
 personObject.put(NAME, person.name);
 personObject.put(AGE, person.age);
 personObject.put(INFO, person.info);
 personObject.saveInBackground(new SaveCallback() {
 @Override
 public void done(AVException e) {
 if (e == null) {
 Log.v(TAG, "put data success!");
 } else {
 Log.v(TAG, "put data failed!error:" + e.getMessage());
 }
 }
 });

2. 读取数据

AVQuery<AVObject> avQuery = new AVQuery<>(TABLENAME);
 avQuery.findInBackground(new FindCallback<AVObject>() {
 @Override
 public void done(List<AVObject> list, AVException e) {
 if (e == null) {
 Log.v(TAG, "get data success!");
 String message = "";
 for (int i = 0; i < list.size(); i++) {
 String name = list.get(i).getString(NAME);
 int age = list.get(i).getInt(AGE);
 String info = list.get(i).getString(INFO);
 message += "name:" + name + ",age:" + age + ",info:" + info + ".\n";
 }
 textView.setText(message);
 }
 }
 });

三、小案例

1.添加strings.xml文件

 <string name="network">Network</string>
 <string name="get_data">获取数据</string>
 <string name="put_data">上传数据</string>

2.修改activity_main.xml文件

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:fitsSystemWindows="true"
tools:context="com.zhangmiao.datastoragedemo.MainActivity">
 <LinearLayout
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:orientation="vertical">
 <TextView
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
 android:text="@string/network" />
 <LinearLayout
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
android:layout_marginBottom="@dimen/fab_margin"
android:layout_marginTop="@dimen/fab_margin"
 android:orientation="horizontal">
 <Button
 android:id="@+id/network_put"
 android:layout_width="0dp"
 android:layout_height="wrap_content"
 android:layout_weight="1"
 android:text="@string/put_data" />
 <Button
 android:id="@+id/network_get"
 android:layout_width="0dp"
 android:layout_height="wrap_content"
 android:layout_weight="1"
 android:text="@string/get_data" />
 </LinearLayout>
 <TextView
 android:id="@+id/table_info"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:text="@string/app_name" />
 </LinearLayout>
</android.support.design.widget.CoordinatorLayout>

3.添加NetworkDBManager类

package com.zhangmiao.datastoragedemo;
import android.util.Log;
import android.widget.TextView;
import com.avos.avoscloud.AVException;
import com.avos.avoscloud.AVObject;
import com.avos.avoscloud.AVQuery;
import com.avos.avoscloud.FindCallback;
import com.avos.avoscloud.SaveCallback;
import java.util.List;
/**
 * Created by zhangmiao on 2016/12/22.
 */
public class NetworkDBManager {
 private static final String TAG = "NetworkDBManager";
 private final static String TABLENAME = "person";
 private final static String NAME = "name";
 private final static String AGE = "age";
 private final static String INFO = "info";
 public void putData(Person person) {
 AVObject personObject = new AVObject(TABLENAME);
 personObject.put(NAME, person.name);
 personObject.put(AGE, person.age);
 personObject.put(INFO, person.info);
 personObject.saveInBackground(new SaveCallback() {
 @Override
 public void done(AVException e) {
 if (e == null) {
 Log.v(TAG, "put data success!");
 } else {
 Log.v(TAG, "put data failed!error:" + e.getMessage());
 }
 }
 });
 }
 public void getData(final TextView textView) {
 AVQuery<AVObject> avQuery = new AVQuery<>(TABLENAME);
 avQuery.findInBackground(new FindCallback<AVObject>() {
 @Override
 public void done(List<AVObject> list, AVException e) {
 if (e == null) {
 Log.v(TAG, "get data success!");
 String message = "";
 for (int i = 0; i < list.size(); i++) {
 String name = list.get(i).getString(NAME);
 int age = list.get(i).getInt(AGE);
 String info = list.get(i).getString(INFO);
 message += "name:" + name + ",age:" + age + ",info:" + info + ".\n";
 }
 textView.setText(message);
 }
 }
 });
 }
}

4.修改AndroidManifest.xml文件

 <uses-permission android:name="android.permission.INTERNET" />
 <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>

5.修改MainActivity

package com.zhangmiao.datastoragedemo;
import android.content.ContentResolver;
import android.content.ContentValues;
import android.database.Cursor;
import android.net.*;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import com.avos.avoscloud.AVOSCloud;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity implements View.OnClickListener {private NetworkDBManager mNetworkDBManager;
 private TextView mTableInfo;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 Log.v("MainActivity", "onCreate");
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 AVOSCloud.initialize(this, "yMNUazdBt872mNtC9aSakjYy-gzGzoHsz", "d4vw3VYdMCjLpsXRhHTBRutC");
 mNetworkDBManager = new NetworkDBManager();
 Button networkGet = (Button) findViewById(R.id.network_get);
 Button networkPut = (Button) findViewById(R.id.network_put);
 mTableInfo = (TextView) findViewById(R.id.table_info);
 networkGet.setOnClickListener(this);
 networkPut.setOnClickListener(this);
 }
 @Override
 public void onClick(View v) {
 switch (v.getId()) {case R.id.network_put:
 Person person3 = new Person("xiao", 23, "women");
 Person person4 = new Person("zhao", 24, "men");
 mNetworkDBManager.putData(person3);
 mNetworkDBManager.putData(person4);
 break;
 case R.id.network_get:
 mNetworkDBManager.getData(mTableInfo);
 break;
 default:
 Log.v("MainActivity", "default");
 break;
 }
 }
}

下载地址：http://xiazai.jb51.net/201612/yuanma/DataStorageDemo-master_jb51.rar

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