Android app 内部在线升级

app在线更新是一个比较常见需求，新版本发布时，进入app,会弹出更新提示框，第一时间更新新版本app。在线更新分为以下几个步骤： 

1.请求api

2.检查版本

3.下载最新版本apk

4.安装apk

下载apk如下：

// mUpgradeAddress：下载apk的地址，size: apk的大小 
private void downloadAPK(String mUpgradeAddress,int size) {
        try {
       
            URL url = new URL(mUpgradeAddress);
            HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
            if (200 != httpURLConnection.getResponseCode()) {
                mHandler.sendEmptyMessage(NETWORK_FAIL);
                return;
            }
            int fileSize = size;
            InputStream inputStream = httpURLConnection.getInputStream();
            BufferedOutputStream bufferedOutputStream = new BufferedOutputStream(new FileOutputStream(mInstallPath));//mInstallPath：存储路径

            byte[] buffer = new byte[1024 * 50];
            int len;
            double readFileLen = 0;
            int lastProgress = 0;

            while (-1 != (len = inputStream.read(buffer))) {
                bufferedOutputStream.write(buffer, 0, len);
                bufferedOutputStream.flush();
                readFileLen += len;
                mDownloadProgress = (int) (readFileLen / fileSize * 100);

                if (mDownloadProgress > lastProgress) {
                    // 这里是显示进度条下载进度，handler更新进度
                    Message msg = new Message();
                    msg.what = PROGRESS;
                    msg.arg1 = mDownloadProgress;
                    mHandler.sendMessage(msg);
                    lastProgress = mDownloadProgress;
                }
            }
            bufferedOutputStream.close();
            inputStream.close();
            httpURLConnection.disconnect();

            mHandler.sendEmptyMessage(INSTALL_APK);//下载完成，调用安装 这里我是通过handler来通知安装 也可以直接调用安装方法
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

安装apk如下：

 private void processApk() {
    // mInstallPath:下载完成保存apk的路径
        try {
            File file = new File(String.valueOf(mInstallPath));
            Intent install = new Intent();
            install.setAction(Intent.ACTION_VIEW);
            install.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            install.addCategory(Intent.CATEGORY_DEFAULT);

            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {//7.0之后需要添加FileProvider
                 String APP_FILE_PROVIDER_AUTH = BuildConfig.APPLICATION_ID + ".fileprovider";
                Uri apkUri = FileProvider.getUriForFile(context, APP_FILE_PROVIDER_AUTH, file);
                install.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
                install.setDataAndType(apkUri, "application/vnd.android.package-archive");
            } else {
                install.setDataAndType(Uri.fromFile(file), "application/vnd.android.package-archive");
            }
            context.startActivity(install);

        }  catch (Exception e) {
            LOG.error("UpgradeClient: install apk,  "+e.getMessage(), e);
        }
    }

到这里就去点击安装自动安装了。

怎么去创建FileProvider?

首先去Manifest.xml注册

 <provider
            android:name="android.support.v4.content.FileProvider"//如果是androidX,请用androidX的FildeProvider
            android:authorities="${APP_FILE_PROVIDER_AUTH}"
            tools:replace="android:authorities"
            android:exported="false"
            android:grantUriPermissions="true">
            <meta-data
                android:name="android.support.FILE_PROVIDER_PATHS"
                android:resource="@xml/filepaths" />
 </provider>

//APP_FILE_PROVIDER_AUTH ：这个参数是我在build.gradle里面创建的如下：
 applicationId = System.getenv("APPLICATION_ID") as String ?: "com.xxx.xxx"
 def appFileProviderAuth = applicationId + (".fileprovider")
 manifestPlaceholders = [
                APP_FILE_PROVIDER_AUTH: appFileProviderAuth,
        ]
注：如果不想写这么麻烦的同学可以简化

@xml/filepaths

<?xml version="1.0" encoding="utf-8"?>
<Path>
    <external-path path="" name="download"/>
</Path>

如果想让进度条在手机工具栏里面显示进度条，可以写一个service和前台通知就可以了。

一个菜鸟的记录，如果不明白也可以随时留言。

本文地址：https://blog.csdn.net/why_111/article/details/107211511