修复在一些更新的安卓手机机型中出现的版本更新问题，解决方法为通过系统设置，请求所有文件访问权限

app/build.gradle

@@ -43,7 +43,7 @@ android {
         minSdkVersion 24
         targetSdkVersion 30
         versionCode 2
-        versionName "2.1.2"
+        versionName "2.1.3"
 
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
 

app/src/main/AndroidManifest.xml

@@ -67,6 +67,8 @@
     <!-- 往SDCard写入数据权限 -->
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"
         tools:ignore="ScopedStorage" />
+    <uses-permission android:name="android.permission.MANAGE_EXTERNAL_STORAGE"
+        tools:ignore="ScopedStorage" />
     <!--  以下为copy旧版本VPN的权限定义部分  -->
     <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
     <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

app/src/main/java/com/pkusz/min_vpn_client/activity/login/LoginActivity.java

@@ -17,6 +17,8 @@ import android.widget.ImageView;
 import android.widget.TextView;
 import android.widget.Toast;
 
+import androidx.appcompat.app.AppCompatActivity;
+
 import com.google.android.material.checkbox.MaterialCheckBox;
 import com.pkusz.min_vpn_client.GlobalSetting;
 import com.pkusz.min_vpn_client.R;
@@ -239,7 +241,7 @@ public class LoginActivity extends MINVpnBaseActivity<LoginActivityPresenter>
             return null;
         });
 
-        // todo: 测试是否需要更新版本
+        // 测试是否需要更新版本
         UpdateAppUtils.checkUpdate(this);
     }
 

app/src/main/java/com/pkusz/min_vpn_client/utils/listview/ListActivity.java

@@ -89,7 +89,7 @@ public class ListActivity extends AppCompatActivity {
                 alertInfo("请输入有效的手机号");
                 return;
             }
-            
+
             // todo: 这里默认是中国的手机号。后期可写成更高级的形式去兼容国外号码
             GetVerificationCode smsRequest=new GetVerificationCode(rawUsername,
                     "86"+phoneNumber);

app/src/main/java/com/pkusz/min_vpn_client/utils/updateApp/UpdateAppUtils.java

@@ -1,5 +1,6 @@
 package com.pkusz.min_vpn_client.utils.updateApp;
 
+import android.Manifest;
 import android.annotation.SuppressLint;
 import android.app.AlertDialog;
 import android.app.ProgressDialog;
@@ -15,6 +16,7 @@ import android.os.Environment;
 import android.os.Handler;
 import android.os.Message;
 
+import android.provider.Settings;
 import android.text.TextUtils;
 import android.util.Log;
 import android.widget.Toast;
@@ -22,7 +24,6 @@ import android.widget.Toast;
 import java.io.ByteArrayOutputStream;
 import java.io.File;
 import java.io.FileOutputStream;
-import java.io.IOException;
 import java.io.InputStream;
 import java.net.HttpURLConnection;
 import java.net.URL;
@@ -51,7 +52,7 @@ public class UpdateAppUtils {
     private ProgressDialog progressDialog;//打圈框
     private ProgressDialog progressDialog_update;//升级进度框
     private Handler handler = new Handler() {
-        @SuppressLint("HandlerLeak")
+        @SuppressLint(value = "HandlerLeak")
         @Override
         public void handleMessage(Message msg) {
             super.handleMessage(msg);
@@ -64,7 +65,7 @@ public class UpdateAppUtils {
                     break;
                 case 1://下载失败
                     dismissUpdateDialog();
-                    showToast("下载失败，请稍后重试");
+                    showToast("下载失败，请稍后重试" + errorDownloadString + openAccessInfo);
                     break;
                 case 2://正在下载
                     showToast("正在下载中");
@@ -81,7 +82,15 @@ public class UpdateAppUtils {
         }
     };
 
+    // 提示打开所有文件权限访问
+    private String openAccessInfo="\n 重启本APP，如跳转到系统设置界面，" +
+            "请打开本APP的\"所有文件访问权限\"，以支持新版本的下载与安装。" +
+            "如操作无效，请联系开发者，并提供您的失败原因码。";
+
     public static void checkUpdate(Context context){
+        // 每次检查更新，都先看是否有更新所需的存储权限
+        checkStorageManagerPermission(context);
+        // 检查更新
         String infoUrl="https://minvpn.qjm253.cn/ztc/android/version.txt";
         String apkUrl="https://minvpn.qjm253.cn/ztc/android/MIN_VPN_v";
         UpdateAppUtils versionUtils=new UpdateAppUtils(context,true,infoUrl,apkUrl);
@@ -348,6 +357,17 @@ public class UpdateAppUtils {
         startDownloadApp();
     }
 
+    // 参考实现：https://blog.csdn.net/qq_17766199/article/details/115351949
+    public static void checkStorageManagerPermission(Context context) {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R &&
+                !Environment.isExternalStorageManager()) {
+            Intent intent = new Intent(Settings.ACTION_MANAGE_ALL_FILES_ACCESS_PERMISSION);
+            intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+            context.startActivity(intent);
+        }
+    }
+
+    private String errorDownloadString ="\n 失败原因码：";
     /**
      * 开始下载
      */
@@ -356,6 +376,7 @@ public class UpdateAppUtils {
             @Override
             public void run() {
                 try {
+                    errorDownloadString +="DownloadApp-1";
                     long totalSize;// 文件总大小
                     long downloadCount = 0;// 已经下载好的大小
 //                    String path;
@@ -371,30 +392,40 @@ public class UpdateAppUtils {
 //                        filePath.mkdirs();
 //                    }
 
+                    errorDownloadString +="-2";
                     // file对象，注意路径要和resource xml里配置的一样
                     File apkPath = new File(Environment.getExternalStorageDirectory()+File.separator+"myapk", "app.apk");
+                    errorDownloadString +="-3";
                     String path=Environment.getExternalStorageDirectory()+File.separator+"myapk";
+                    errorDownloadString +="-4";
                     File filePath=new File(path);
                     if (!filePath.exists() || !filePath.isDirectory()) {
                         filePath.mkdirs();
                     }
+                    errorDownloadString +="-5";
 
 //                    File apkPath = new File(filePath, "app.apk");
                     if (!apkPath.exists()) {
                         apkPath.createNewFile();
                     }
+                    errorDownloadString +="-6";
 
                     URL url = new URL(apkurl);
                     HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
+                    errorDownloadString +="-7";
                     httpURLConnection.setConnectTimeout(10 * 1000);
                     httpURLConnection.setReadTimeout(10 * 1000);
                     httpURLConnection.setDoInput(true);
                     // 获取下载文件的size
                     totalSize = httpURLConnection.getContentLength();
+                    errorDownloadString +="-8";
                     int response = httpURLConnection.getResponseCode(); //获得服务器的响应码
+                    errorDownloadString +="-9";
                     if (response == HttpURLConnection.HTTP_OK) {//200
+                        errorDownloadString +="-10";
                         InputStream inputStream = httpURLConnection.getInputStream();
                         FileOutputStream outputStream = new FileOutputStream(apkPath, false);// 文件存在则覆盖掉
+                        errorDownloadString +="-11";
                         byte buffer[] = new byte[1024];
                         int readsize = 0;
                         while ((readsize = inputStream.read(buffer)) != -1) {
@@ -407,23 +438,28 @@ public class UpdateAppUtils {
                             handler.sendMessage(msg);
                             Log.i(TAG, "downloadCount：" + downloadCount);
                         }
+                        errorDownloadString +="-12";
 
                         httpURLConnection.disconnect();
                         outputStream.flush();
                         inputStream.close();
                         outputStream.close();
 
+                        errorDownloadString +="-13";
                         Message msg = handler.obtainMessage();
                         msg.what = 0;
                         msg.obj = apkPath;
                         handler.sendMessage(msg);
 
+                        errorDownloadString +="-14";
                         Log.i(TAG, apkPath + " downloadCount：" + downloadCount);
                     } else {
+                        errorDownloadString +="-00";
                         handler.sendEmptyMessage(1);
                         Log.i(TAG, "httpErr:response：" + response);
                     }
                 } catch (Exception e) {
+                    errorDownloadString +="-0";
                     handler.sendEmptyMessage(1);
                     e.printStackTrace();
                 }

app/src/main/res/layout/activity_login.xml

@@ -18,7 +18,7 @@
         android:layout_marginLeft="@dimen/dp_20"
         android:layout_marginRight="@dimen/dp_0"
         android:padding="5dp"
-        android:text="v2.1.2"
+        android:text="v2.1.3"
         android:textColor="@color/color_bg_name"
         android:textSize="17.5dp"
         app:layout_constraintRight_toRightOf="parent"