歡迎界面做完了接下來就進行檢測升級這部分的內(nèi)容

設置APK包的相關屬性

在Gradle Scripts->build.gradle(Module: app)

apply plugin: 'com.android.application'//說明module的類型，com.android.application為應用程序，com.android.library為庫

android {
    compileSdkVersion 26 //編譯的SDK版本智末。編譯該app時候缩赛，你想使用到的api版本昧狮。
    buildToolsVersion "26.0.1" //構建工具的版本號酿联。
    defaultConfig { //defaultConfig方法包含了該app的核心屬性乖订，該屬性會重寫在AndroidManifest.xml中的對應屬性扮饶。
        applicationId "com.lt.android.securityguards" //應用程序的包名
        minSdkVersion 19 //支持的最低版本
        targetSdkVersion 26 //支持的目標版本
        versionCode 1 //版本號
        versionName "1.0" //版本名
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner" 
        //AndroidJUnitRunner類是一個JUnit測試運行器,允許運行JUnit 3或JUnit 4測試類在Android設備上,包括那些使用Espresso和UI Automator框架。
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    packagingOptions{ //設置APK包的相關屬性
        exclude 'META-INF/DEPENDENCIES.txt'
        exclude 'META-INF/LICENSE.txt'
        exclude 'META-INF/NOTICE.txt'
        exclude 'META-INF/NOTICE'
        exclude 'META-INF/LICENSE'
        exclude 'META-INF/DEPENDENCIES'
        exclude 'META-INF/notice.txt'
        exclude 'META-INF/license.txt'
        exclude 'META-INF/dependencies.txt'
        exclude 'META-INF/LGPL2.1'
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    compile 'com.android.support:appcompat-v7:26.+'
    compile 'com.android.support.constraint:constraint-layout:1.0.2'
    testCompile 'junit:junit:4.12'
}

我們此處主要是添加packagingOptions部分的代碼乍构，在修改完build.gradle文件后會有如下提示甜无，須點擊Sync Now才可運行程序

修改build.gradle文件后會提示

這一段主要為后面導包做鋪墊，不加上這一段就會出錯

新建目錄與文件

先新建所需目錄與文件哥遮，右鍵->New->

新建子包

先新建m1home目錄岂丘，然后在其目錄下新建entity和utils目錄，在utils目錄下新建名為DownloadUtils眠饮、VersionUtils和MyUtils的Java Class奥帘，在entity目錄下新建VersionEntity

如果你之前將項目傳到Github倉庫過，那么新建文件后會提示

GitHub

此時若點擊No則此文件不會上傳到github仪召，且文件名顏色為暗紅色寨蹋，若點擊Yes則文件名為綠色，文件名為藍色則表示修改過此文件

導入第三方jar包

將目錄顯示模式從Android改為Project

libs目錄

然后將下載好的第三方jar包粘貼到app/libs下

接著點擊菜單欄的Build->Edit Libraries Dependencies

Edit Libraries Dependencies

Project Structure

點擊下方的 + -> Jar dependency扔茅，將剛剛導入的三個包逐個加入钥庇，接著目錄就會如下顯示

libs目錄

增加權限

打開AndroidManifest.xml清單文件增加此應用的權限

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.lt.android.securityguards">

    <uses-permission android:name="android.permission.INTERNET" /> <!--允許程序訪問網(wǎng)絡-->
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> <!--允許程序寫入外部存儲，如SD卡上寫文件-->

    <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=".SplashActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

</manifest>

下載工具類

• DownloadUtils

package com.lt.android.securityguards.m1home.utils;

import android.app.DownloadManager;
import android.content.Context;
import android.net.Uri;
import android.webkit.MimeTypeMap;

/**
 * Created by lt on 2017/10/20.
 */

public class DownloadUtils {
    public void downloadApk(String url,String targetFile, Context context){
        DownloadManager.Request request = new DownloadManager.Request(Uri.parse(url));
        request.setAllowedOverRoaming(false);

        MimeTypeMap mimeTypeMap = MimeTypeMap.getSingleton();
        String mimeString = mimeTypeMap.getMimeTypeFromExtension(mimeTypeMap.getFileExtensionFromUrl(url));
        request.setMimeType(mimeString);

        request.setDestinationInExternalPublicDir("/download",targetFile);
        request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE);
        request.setVisibleInDownloadsUi(true);

        DownloadManager downloadManager = (DownloadManager) context.getSystemService(Context.DOWNLOAD_SERVICE);
        long mTaskid = downloadManager.enqueue(request);
    }
}

檢測本地版本號

• MyUtils

package com.lt.android.securityguards.m1home.utils;

import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;

/**
 * Created by lt on 2017/10/20.
 */

public class MyUtils {
    public static String getVersion(Context context){
        //PackageManager可以獲取清單文件中的所有信息
        PackageManager packageManager = context.getPackageManager();
        try{
            //getPackageInfo獲取當前程序的包名
            PackageInfo packageInfo = packageManager.getPackageInfo(context.getPackageName(),0);
            return packageInfo.versionName;
        } catch (PackageManager.NameNotFoundException e) {
            e.printStackTrace();
            return "";
        }
    }
}

版本信息實體類

• VersionEntity

package com.lt.android.securityguards.m1home.entity;

/**
 * Created by lt on 2017/10/20.
 */

public class VersionEntity {
    /**服務器版本號*/
    public String versionCode;
    /**版本描述*/
    public String description;
    /**apk下載地址*/
    public String apklurl;
}

版本更新工具類

• VersionUpdateUtils

package com.lt.android.securityguards.m1home.utils;

import android.app.Activity;

import com.lt.android.securityguards.m1home.entity.VersionEntity;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.util.EntityUtils;
import org.json.JSONException;
import org.json.JSONObject;

import java.io.IOException;

/**
 * Created by lt on 2017/10/20.
 */

public class VersionUpdateUtils {
    //本地版本號
    private String mVersion;
    private Activity context;
    private VersionEntity versionEntity;

    public VersionUpdateUtils(String mVersion, Activity context) {
        this.mVersion = mVersion;
        this.context = context;
    }

    //獲取服務器版本號
    public void getCloudVersion() {
        try {
            HttpClient httpClient = new DefaultHttpClient();
            //連接超時
            HttpConnectionParams.setConnectionTimeout(httpClient.getParams(), 5000);
            //請求超時
            HttpConnectionParams.setSoTimeout(httpClient.getParams(), 5000);
            HttpGet httpGet = new HttpGet("http://android2017.duapp.com/updateinfo.html");
            HttpResponse excute = httpClient.execute(httpGet);
            if (excute.getStatusLine().getStatusCode() == 200) {
                //請求和響應都成功了
                HttpEntity entity = excute.getEntity();
                String result = EntityUtils.toString(entity, "utf-8");
                //創(chuàng)建jsonObject對象
                JSONObject jsonObject = new JSONObject(result);
                versionEntity = new VersionEntity();
                versionEntity.versionCode = jsonObject.getString("code");
                versionEntity.description = jsonObject.getString("des");
                versionEntity.apklurl = jsonObject.getString("apkurl");
                if (!mVersion.equals(versionEntity.versionCode)) {
                    //版本不同需升級
                    System.out.println(versionEntity.description);
                    DownloadUtils downloadUtils = new DownloadUtils();
                    downloadUtils.downloadApk(versionEntity.apklurl, "mobileguard.apk", context);
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        } catch (JSONException e) {
            e.printStackTrace();
        }
    }
}

歡迎界面邏輯

• SplashActivity

package com.lt.android.securityguards;

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

import com.lt.android.securityguards.m1home.utils.MyUtils;
import com.lt.android.securityguards.m1home.utils.VersionUpdateUtils;

public class SplashActivity extends AppCompatActivity {
    private TextView mTvVersion;
    private String mVersion;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_splash);
        mVersion = MyUtils.getVersion(getApplicationContext());
        mTvVersion = (TextView) findViewById(R.id.tv_splash_version);
        mTvVersion.setText("版本號："+mVersion);
        final VersionUpdateUtils versionUpdateUntils = new VersionUpdateUtils(mVersion,SplashActivity.this);
        new Thread(){
            @Override
            public void run() {
                super.run();
                versionUpdateUntils.getCloudVersion();
            }
        }.start();
    }
}

微調(diào)歡迎界面

• activity_splash.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:background="@drawable/launch_bg">
    <ProgressBar
        android:id="@+id/pb_splash_loading"
        style="?android:attr/progressBarStyle"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerVertical="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="207dp"
        />
    <TextView
        android:id="@+id/tv_splash_version"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:text="version：1.0"
        android:layout_below="@+id/pb_splash_loading"/>

</RelativeLayout>