Bmob后端云的使用

参考链接：http://doc.bmob.cn/data/android/#sdk_1

如果报错Error: Invoke-customs are only supported starting with Android O (--min-api 26)：https://blog.csdn.net/Test_tju/article/details/100516933

模块结构图：

工程的build.gradle：

import jdk.internal.dynalink.linker.LinkerServices

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {
    
    repositories {
        google()
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.2.1'

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        google()
        jcenter()
        //Bmob的maven仓库地址--必填
        maven {url 'https://dl.bintray.com/chaozhouzhang/maven' }
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

 模块的build.gradle：android{}里添加useLibrary.......,dependencies {}里添加多个implementation 

apply plugin: 'com.android.application'

android {
    compileSdkVersion 29

    useLibrary 'org.apache.http.legacy'

    defaultConfig {
        applicationId "com.mingrisoft.bmobtest2"
        minSdkVersion 15
        targetSdkVersion 29
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"

    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }

    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }

}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])

    implementation 'com.android.support:appcompat-v7:+'
    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'

    implementation 'cn.bmob.android:bmob-sdk:3.7.8'
    implementation "io.reactivex.rxjava2:rxjava:2.2.8"
    implementation 'io.reactivex.rxjava2:rxandroid:2.1.1'
    implementation 'com.squareup.okhttp3:okhttp:3.14.1'
    implementation 'com.squareup.okio:okio:2.2.2'
    implementation 'com.google.code.gson:gson:2.8.5'
}

manifests：添加权限和provider

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.mingrisoft.bmobtest">
    <!--允许联网 -->
    <uses-permission android:name="android.permission.INTERNET" />
    <!--获取GSM（2g）、WCDMA（联通3g）等网络状态的信息  -->
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <!--获取wifi网络状态的信息 -->
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
    <!--保持CPU 运转，屏幕和键盘灯有可能是关闭的,用于文件上传和下载 -->
    <uses-permission android:name="android.permission.WAKE_LOCK" />
    <!--获取sd卡写的权限，用于文件上传和下载-->
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <!--允许读取手机状态 用于创建BmobInstallation-->
    <uses-permission android:name="android.permission.READ_PHONE_STATE" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <provider
            android:name="cn.bmob.v3.util.BmobContentProvider"
            android:authorities="com.mingrisoft.bmobtest.BmobContentProvider"> //这里要改为自己的包名
        </provider>
    </application>

</manifest>

activity_main.xml：

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</android.support.constraint.ConstraintLayout>

MainActivity：

package com.mingrisoft.bmobtest;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.Toast;

import cn.bmob.v3.Bmob;
import cn.bmob.v3.BmobQuery;
import cn.bmob.v3.exception.BmobException;
import cn.bmob.v3.listener.QueryListener;
import cn.bmob.v3.listener.SaveListener;
import cn.bmob.v3.listener.UpdateListener;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        //第一：默认初始化
        Bmob.initialize(this, "1368b7fd0a523efab971eb807e1b9bc2");  //这里要设置成自己的key

        Person p2 = new Person();
        p2.setName("lucky");
        p2.setAddress("北京海淀");
        p2.save(new SaveListener<String>() {
            @Override
            public void done(String objectId,BmobException e) {
                if(e==null){
                    Toast.makeText(MainActivity.this, "添加数据成功，返回objectId为："+objectId, Toast.LENGTH_LONG).show();
                }else{
                    Toast.makeText(MainActivity.this, "创建数据失败：" + e.getMessage(), Toast.LENGTH_LONG).show();
                }
            }
        });

        //查找Person表里面id为6b6c11c537的数据
        BmobQuery<Person> bmobQuery = new BmobQuery<Person>();
        bmobQuery.getObject("b7ca30c826", new QueryListener<Person>() {
            @Override
            public void done(Person object,BmobException e) {
                if(e==null){
                    Toast.makeText(MainActivity.this, "查询成功", Toast.LENGTH_LONG).show();
                }else{
                    Toast.makeText(MainActivity.this, "查询失败：" + e.getMessage(), Toast.LENGTH_LONG).show();
                }
            }
        });

        //更新Person表里面id为b80c3fefdb的数据，address内容更新为“北京朝阳”
        Person p3 = new Person();
        p3.setAddress("广西南宁");
        p3.update("b80c3fefdb", new UpdateListener() {

            @Override
            public void done(BmobException e) {
                if(e==null){
                    Toast.makeText(MainActivity.this,"更新成功:"+p3.getUpdatedAt(), Toast.LENGTH_LONG).show();
                }else{ Toast.makeText(MainActivity.this, "更新失败：" + e.getMessage(), Toast.LENGTH_LONG).show();
                }
            }

        });

        Person p4 = new Person();
        p4.setObjectId("b80c3fefdb");
        p4.delete(new UpdateListener() {

            @Override
            public void done(BmobException e) {
                if(e==null){
                    Toast.makeText(MainActivity.this,"删除成功:"+p4.getUpdatedAt(), Toast.LENGTH_LONG).show();
                }else{
                    Toast.makeText(MainActivity.this,"删除失败：" + e.getMessage(), Toast.LENGTH_LONG).show();
                }
            }

        });
    }
}

Person：

package com.mingrisoft.bmobtest;

import cn.bmob.v3.BmobObject;

/** ����javaBean
  * @ClassName: Person
  * @Description: TODO
  * @author smile
  * @date 2014-5-20 ����4:12:55
  */
public class Person extends BmobObject {
    
    private String name;
    private String address;

    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getAddress() {
        return address;
    }
    public void setAddress(String address) {
        this.address = address;
    }
}

云端结果图：