Android应用中apk下载更新，适用于android 9及以下安卓版本。
直接上代码：
一、在主配置文件中写权限。
<uses-permission android:name="android.permission.RECORD_AUDIO" /><uses-permission android:name="android.permission.INTERNET" /><!-- 连网必须加的 --><uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> <!-- SDCard写权限 --><uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /> <!-- SDCard读权限 --><uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /><uses-permission android:name="android.permission.ACCESS_WIFI_STATE" /><uses-permission android:name="android.permission.READ_PHONE_STATE" /><uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" /><uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" /><uses-permission android:name="android.permission.CAMERA" /><uses-permission android:name="android.permission.GET_TASKS" /><uses-permission android:name="android.permission.MODE_PRIVATE" /> <!-- 创建文件夹 --><uses-permission android:name="android.permission.REQUEST_INSTALL_PACKAGES" /> <!-- 安装权限 --><uses-permission android:name="android.permission.READ_CONTACTS" /><uses-permission android:name="android.permission.PERMISSION_GRANTED" /><application> //在此加入<providerandroid:name="androidx.core.content.FileProvider" //也可以引用v4包android:authorities="com.example.myapplication1.provider" //注意.provider前面为你的包名android:exported="false"android:grantUriPermissions="true"><meta-dataandroid:name="android.support.FILE_PROVIDER_PATHS"android:resource="@xml/files_paths" /> //在res文件夹下新建package命名为xml，新建xml文件命名为files_paths</provider></application>
二、创建 files_paths.xml
<?xml version="1.0" encoding="utf-8"?><resources><paths><external-path name="renyi" path=""/></paths></resources>
三、创建 UpdateVersionController.java
public class UpdateVersionController {private Button cancelBtn;private Context context;private int info;private int info3;private int versionCode;//当前版本号private Dialog dialog; //提示用户更新的dialogprivate ProgressDialog pd; //下载进度条public static UpdateVersionController getInstance(Context context) {return new UpdateVersionController(context);}public UpdateVersionController(Context context) {this.context = context;}/** 记得运行该方法*/public void forceCheckUpdateInfo(){//获取版本号，这个版本号为未更新的版本号versionCode = getVerCode(context);//获取app新版版本信息，添加网络请求new Thread(new Runnable() {@Overridepublic void run() {/**用的Volley框架，Volley可以自己搜索下载jar包，下面是使用Volley获取GET请求的方法*/RequestQueue mQueue= Volley.newRequestQueue(context);JsonObjectRequest mreq=new JsonObjectRequest(Request.Method.GET,“获取版本号的网址”,new Response.Listener<JSONObject>() {@Overridepublic void onResponse(JSONObject jsonObject) {String tt=jsonObject.toString();//把获取的jsonObject转为String类型Gson gson=new Gson(); //这里我用的是Gson解析，可以自己搜索gson的jar包下载使用AppVersion nt=gson.fromJson(tt, AppVersion.class);//这里的AppVersion是网络获取版本号的网址中json数据的实体类，tt是网络获取的数据，用该方法实现json解析//关于实体类：从服务器网址获取的json数据，通过搜索json自动生成实体类下载复制。并 implement Serializable ，添加构造方法info=nt.getVNumber(); //通过nt获取实体类里的版本号，为String类型info3=nt.getIsForce(); //通过nt获取是否强制更新，为String类型Log.e("版本",""+versionCode);//建议输出一下版本号，进行对比//更新app版本号比对，info新版本号和当前的版本号versionCode做对比，如果新版本号大于本版本就运行更新方法showUpdataDialog()if ( info > versionCode) {showUpdataDialog();} else {}}}, new Response.ErrorListener() {@Overridepublic void onErrorResponse(VolleyError volleyError) {Log.e("*****", String.valueOf(volleyError));}});mQueue.add(mreq);}}).start();}/*** 弹出对话框提示用户更新*/protected void showUpdataDialog() {dialog = new Dialog(context, android.R.style.Theme_Dialog);dialog.getWindow().setBackgroundDrawableResource(android.R.color.transparent);dialog.setContentView(R.layout.activity_updater);dialog.setCanceledOnTouchOutside(false);dialog.setCancelable(false);((TextView) dialog.findViewById(R.id.content)).setText("是否进行更新?");cancelBtn = (Button) dialog.findViewById(R.id.cancel);cancelBtn.setVisibility("0".equals(info3) ? View.GONE : View.VISIBLE);// 取消更新cancelBtn.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {dialog.dismiss();}});// 确认更新dialog.findViewById(R.id.ok).setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {dialog.dismiss();downLoadApk();}});dialog.show();}/*** 步骤三：下载文件*/private void downLoadApk() {// 进度条对话框pd = new ProgressDialog(context);pd.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);pd.setMessage("下载中...");pd.setCanceledOnTouchOutside(false);pd.setCancelable(false);// 监听返回键--防止下载的时候点击返回pd.setOnKeyListener(new OnKeyListener() {@Overridepublic boolean onKey(DialogInterface dialog, int keyCode, KeyEvent event) {if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) {Toast.makeText(context, "正在下载请稍后", Toast.LENGTH_SHORT).show();return true;} else {return false;}}});// Sdcard不可用if (!Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {Toast.makeText(context, "SD卡不可用", Toast.LENGTH_SHORT).show();} else {pd.show();//下载的子线程new Thread() {@Overridepublic void run() {try {// 在子线程中下载APK文件File file = getFileFromServer(“下载apk的网址 ”, pd);sleep(1000);// 安装APK文件OpenFileUtil.openFileByPath(context,file.toString());pd.dismiss(); // 结束掉进度条对话框} catch (Exception e) {Toast.makeText(context, "文件下载失败了", Toast.LENGTH_SHORT).show();pd.dismiss();e.printStackTrace();}}}.start();}}/*** 从服务器下载apk*/public File getFileFromServer(String path, ProgressDialog pd) throws Exception {// 如果相等的话表示当前的sdcard挂载在手机上并且是可用的if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {URL url = new URL(path);HttpURLConnection conn = (HttpURLConnection) url.openConnection();conn.setConnectTimeout(5000);// 获取到文件的大小pd.setMax(conn.getContentLength() / 1024);InputStream is = conn.getInputStream();String p = PathUtils.path;File file = new File(p+ "/update/aaaa.apk");Log.e("File路径",""+file);//判断文件夹是否被创建boolean mkdirs;if (!file.getParentFile().exists()) {mkdirs = file.getParentFile().mkdirs();}FileOutputStream fos = new FileOutputStream(file);BufferedInputStream bis = new BufferedInputStream(is);byte[] buffer = new byte[1024];int len;int total = 0;while ((len = bis.read(buffer)) != -1) {fos.write(buffer, 0, len);total += len;// 获取当前下载量pd.setProgress(total / 1024);}fos.close();bis.close();is.close();return file;} else {return null;}}/*** 获取版本号*/public static int getVerCode(Context context) {int verCode = -1;try {// 获取packagemanager的实例PackageManager packageManager = context.getPackageManager();// getPackageName()是你当前类的包名，0代表是获取版本信息PackageInfo packInfo = packageManager.getPackageInfo(context.getPackageName(), 0);verCode = packInfo.versionCode;} catch (Exception e) {e.printStackTrace();}return verCode;}}
三、创建OpenFileUtil.java 打开任意文件也可以使用该类
public class OpenFileUtil {private static final String[][] MATCH_ARRAY={//{后缀名， 文件类型}{".3gp", "video/3gpp"},{".apk", "application/vnd.android.package-archive"},{".asf", "video/x-ms-asf"},{".avi", "video/x-msvideo"},{".bin", "application/octet-stream"},{".bmp","image/bmp"},{".c", "text/plain"},{".class", "application/octet-stream"},{".conf", "text/plain"},{".cpp", "text/plain"},{".doc", "application/msword"},{".docx", "application/msword"},{".xls", "application/msword"},{".xlsx", "application/msword"},{".exe", "application/octet-stream"},{".gif", "image/gif"},{".gtar", "application/x-gtar"},{".gz", "application/x-gzip"},{".h", "text/plain"},{".htm", "text/html"},{".html", "text/html"},{".jar", "application/java-archive"},{".java", "text/plain"},{".jpeg", "image/jpeg"},{".jpg", "image/jpeg"},{".js", "application/x-javascript"},{".log", "text/plain"},{".m3u", "audio/x-mpegurl"},{".m4a", "audio/mp4a-latm"},{".m4b", "audio/mp4a-latm"},{".m4p", "audio/mp4a-latm"},{".m4u", "video/vnd.mpegurl"},{".m4v", "video/x-m4v"},{".mov", "video/quicktime"},{".mp2", "audio/x-mpeg"},{".mp3", "audio/x-mpeg"},{".mp4", "video/mp4"},{".mpc", "application/vnd.mpohun.certificate"},{".mpe", "video/mpeg"},{".mpeg", "video/mpeg"},{".mpg", "video/mpeg"},{".mpg4", "video/mp4"},{".mpga", "audio/mpeg"},{".msg", "application/vnd.ms-outlook"},{".ogg", "audio/ogg"},{".pdf", "application/pdf"},{".png", "image/png"},{".pps", "application/vnd.ms-powerpoint"},{".ppt", "application/vnd.ms-powerpoint"},{".prop", "text/plain"},{".rar", "application/x-rar-compressed"},{".rc", "text/plain"},{".rmvb", "audio/x-pn-realaudio"},{".rtf", "application/rtf"},{".sh", "text/plain"},{".tar", "application/x-tar"},{".tgz", "application/x-compressed"},{".txt", "text/plain"},{".wav", "audio/x-wav"},{".wma", "audio/x-ms-wma"},{".wmv", "audio/x-ms-wmv"},{".wps", "application/vnd.ms-works"},{".xml", "text/plain"},{".z", "application/x-compress"},{".zip", "application/zip"},{"", "*/*"}};/*** 根据路径打开文件* @param context 上下文* @param path 文件路径*/public static void openFileByPath(Context context, String path) {if(context==null||path==null)return;Intent intent = new Intent();//设置intent的Action属性intent.setAction(Intent.ACTION_VIEW);intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);intent.addCategory(Intent.CATEGORY_DEFAULT);//文件的类型String type = "";for(int i =0;i < MATCH_ARRAY.length;i++){//判断文件的格式if(path.contains(MATCH_ARRAY[i][0])){type = MATCH_ARRAY[i][1];break;}}try {File out = new File(path);Uri fileURI;if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {// 由于7.0以后文件访问权限，可以通过定义xml在androidmanifest中申请，也可以直接跳过权限// 通过定义xml在androidmanifest中申请//fileURI = FileProvider.getUriForFile(context,// "com.lonelypluto.zyw_test.provider",// out);// 直接跳过权限StrictMode.VmPolicy.Builder builder = new StrictMode.VmPolicy.Builder();StrictMode.setVmPolicy(builder.build());fileURI = Uri.fromFile(out);}else{fileURI = Uri.fromFile(out);}//设置intent的data和Type属性intent.setDataAndType(fileURI, type);//跳转if (context.getPackageManager().resolveActivity(intent, PackageManager.MATCH_DEFAULT_ONLY) != null) {context.startActivity(intent);} else {Toast.makeText(context, "没有找到对应的程序", Toast.LENGTH_SHORT).show();}} catch (Exception e) { //当系统没有携带文件打开软件，提示Toast.makeText(context, "无法打开该格式文件", Toast.LENGTH_SHORT).show();e.printStackTrace();}}}
三、PathUtils .java
public class PathUtils {public static String path = null;}
四、程序入口MainActivity.java
private UpdateVersionController controller=new UpdateVersionController(this);@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);PathUtils.path = getExternalFilesDir(null).toString();controller.forceCheckUpdateInfo();//运行该方法if (Build.VERSION.SDK_INT>=23&&checkSelfPermission(Manifest.permission.READ_EXTERNAL_STORAGE)!= PackageManager.PERMISSION_GRANTED){requestPermissions(new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},1);requestPermissions(new String[]{Manifest.permission.RECORD_AUDIO},1);requestPermissions(new String[]{Manifest.permission.INTERNET},1);requestPermissions(new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},1);requestPermissions(new String[]{Manifest.permission.ACCESS_NETWORK_STATE},1);requestPermissions(new String[]{Manifest.permission.ACCESS_WIFI_STATE},1);requestPermissions(new String[]{Manifest.permission.READ_PHONE_STATE},1);requestPermissions(new String[]{Manifest.permission.ACCESS_FINE_LOCATION},1);requestPermissions(new String[]{Manifest.permission.ACCESS_COARSE_LOCATION},1);requestPermissions(new String[]{Manifest.permission.CAMERA},1);requestPermissions(new String[]{Manifest.permission.GET_TASKS},1);requestPermissions(new String[]{Manifest.permission.REQUEST_INSTALL_PACKAGES},1);requestPermissions(new String[]{Manifest.permission.READ_CONTACTS},1);}}
完成了。
