实现程序自动更新，简单来说就是两步：
1、把自动更新apk程序下载到本地；
2、安装下载的apk程序
效果视频可以转到微信公众号文章中查看：
https://mp.weixin.qq.com/s/jkK7rR6rRmbeMekqh3h6WQ
关于实现程序自动更新服务端相关操作可参考
Spring Boot实现文件上传与下载
0. 开发环境
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IDE：Android Studio
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JDK：1.8
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Gradle Plugin：3.5.3
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Gradle：5.4.1
1. 检查更新服务
public class UpdateService {
private static OkHttpClient okHttpClient;
public static void download(final String fileName, final UpdateCallback callback) {
String url = "http://127.0.0.1:8090/springbootdemo/log/download/" + fileName;
Request request = new Request.Builder()
.addHeader("Accept-Encoding", "identity")
.url(url).build();
if (okHttpClient == null) {
okHttpClient = new OkHttpClient();
}
okHttpClient.newCall(request).enqueue(new Callback() {
@Override
public void onFailure(Call call, IOException e) {
callback.onFailure();
}
@Override
public void onResponse(Call call, Response response) throws IOException {
if (response.body() == null) {
callback.onFailure();
return;
}
File filePath = new File(CommonConstants.DOWNLOAD_PATH);
if (!filePath.exists()) {
filePath.mkdirs();
}
long contentLength = response.body().contentLength();
byte[] buffer = new byte[1024];
File file = new File(filePath.getCanonicalPath(), fileName);
try (InputStream is = response.body().byteStream();
FileOutputStream fos = new FileOutputStream(file)) {
LoggerUtils.getLogger().info("保存路径：" + file);
int length;
long sum = 0;
while ((length = is.read(buffer)) != -1) {
fos.write(buffer, 0, length);
sum += length;
int progress = (int) (sum * 1.0f / contentLength * 100);
callback.onProgress(progress);
}
fos.flush();
callback.onSuccess();
} catch (Exception e) {
callback.onFailure();
}
}
});
}
public interface UpdateCallback {
void onSuccess();
void onProgress(int progress);
void onFailure();
}
}
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2. 检查更新界面
@ActivityLayoutInject(R.layout.activity_update)
public class UpdateActivity extends BaseActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@OnClick(R.id.menuBtnCheckUpdate)
public void onClickCheckUpdate() {
final ProgressDialog dialog = new ProgressDialog(this);
dialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
dialog.setCanceledOnTouchOutside(false);
dialog.setCancelable(true);
dialog.setTitle("正在下载");
dialog.setMessage("请稍后...");
dialog.setProgress(0);
dialog.setMax(100);
dialog.show();
String fileName = "AndroidDemo-v1.0.0.0.apk";
UpdateService.download(fileName, new UpdateService.UpdateCallback() {
@Override
public void onSuccess() {
dialog.dismiss();
if (!Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
return;
}
File file = new File(CommonConstants.DOWNLOAD_PATH + fileName);
try {
LoggerUtils.getLogger().info("安装文件目录：" + file);
LoggerUtils.getLogger().info("准备安装");
installApk(file);
} catch (Exception e) {
LoggerUtils.getLogger().info("获取打开方式错误", e);
}
}
@Override
public void onProgress(int progress) {
dialog.setProgress(progress);
}
@Override
public void onFailure() {
dialog.dismiss();
}
});
}
private void installApk(File file) {
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
Uri fileUri;
if (Build.VERSION.SDK_INT >= 24) {
fileUri = FileProvider.getUriForFile(this,
BuildConfig.APPLICATION_ID + ".provider", file);
intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
} else {
fileUri = Uri.fromFile(file);
}
intent.setDataAndType(fileUri, "application/vnd.android.package-archive");
startActivity(intent);
}
}
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如果你的Android机器是7.0以下，到这里就可以了，但是如果是7.0以上，还需如下操作。
3. 新建file_paths.xml文件
res\xml文件夹下新建file_paths.xml，path就是下载的apk存放目录
<?xml version="1.0" encoding="utf-8"?>
<paths>
<external-path
name="download"
path="AndroidDemo/download/" />
</paths>
4. 注册FileProvider
在AndroidManifest.xml的application下注册
<provider
android:name="androidx.core.content.FileProvider"
android:authorities="cn.wbnull.androiddemo.provider"
android:exported="false"
android:grantUriPermissions="true">
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/file_paths" />
</provider>
5. 注册读写权限
在AndroidManifest.xml中注册读写和网络权限
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
好了，到这里我们就实现最上视频中所示效果了。
GitHub：
https://github.com/dkbnull/AndroidDemo
微信：
https://mp.weixin.qq.com/s/jkK7rR6rRmbeMekqh3h6WQ
微博：
https://weibo.com/ttarticle/p/show?id=2309404465065775464739
