Android Network Data Storage and android Data Storage

Android Network Data Storage and android Data Storage
1. Introduction to saving Network Data

You can use the network to save data, obtain data from the network as needed, and then display the data in the App.

There are many ways to store data over the network, and different upload and retrieval methods are used for different network data.

This document uses LeanCloud to store network data.

LeanCloud is a simple and efficient data and file storage service. For more information, see https://leancloud.cn /. You can find how to use LeanCloud data storage. This article does not describe how to use LeanCloud. The LeanCloud platform provides an example of how to store data on the network.

Ii. Usage 1. Upload data

        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. Read data

        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);                }            }        });

Iii. Case 1. Add the strings. xml file

<String name = "network"> Network </string> <string name = "get_data"> obtain data </string> <string name = "put_data"> upload data </string>

2. Modify the activity_main.xml File

<?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. Add the NetworkDBManager class

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. Modify the AndroidManifest. xml file

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

5. Modify 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;        }    }}

Code: https://github.com/ZhangMiao147/DataStorageDemo