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可以使用網(wǎng)絡(luò)來保存數(shù)據(jù),在需要的時候從網(wǎng)絡(luò)上獲取數(shù)據(jù),進(jìn)而顯示在App中。
用網(wǎng)絡(luò)保存數(shù)據(jù)的方法有很多種,對于不同的網(wǎng)絡(luò)數(shù)據(jù)采用不同的上傳與獲取方法。
本文利用LeanCloud來進(jìn)行網(wǎng)絡(luò)數(shù)據(jù)的存儲。
LeanCloud是一種簡單高效的數(shù)據(jù)和文件存儲服務(wù)。感興趣的可以查看網(wǎng)址:https://leancloud.cn/。關(guān)于LeanCloud的數(shù)據(jù)存儲使用方法可以在里面找到,本文不講述關(guān)于LeanCloud的使用,知識借助LeanCloud平臺舉一個在網(wǎng)絡(luò)上存儲數(shù)據(jù)的例子。
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()); } } });
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); } } });
<string name="network">Network</string> <string name="get_data">獲取數(shù)據(jù)</string> <string name="put_data">上傳數(shù)據(jù)</string>
<?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>
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); } } }); } }
<uses-permission android:name="android.permission.INTERNET" /> <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
android.net.* MainActivity AppCompatActivity "MainActivity", "onCreate", "yMNUazdBt872mNtC9aSakjYy-gzGzoHsz", "d4vw3VYdMCjLpsXRhHTBRutC"= === = Person("xiao", 23, "women"= Person("zhao", 24, "men""MainActivity", "default"
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