就这样吧

android/src/main/java/top/jerryyan/RN/A/VersionUpgrade/UpgradeModule.java

@@ -20,7 +20,10 @@ import com.facebook.react.bridge.ReactMethod;
 import org.json.JSONException;
 import org.json.JSONObject;
 
+import java.io.File;
+import java.io.FileOutputStream;
 import java.io.IOException;
+import java.io.InputStream;
 import java.util.HashMap;
 import java.util.Map;
 
@@ -33,7 +36,7 @@ import okhttp3.Response;
 public class UpgradeModule extends ReactContextBaseJavaModule {
     private final ReactApplicationContext reactContext;
     private String DOWNLOAD_URL = "http://luntan.qgmzbxs.com/source/tsgzCircles.apk";
-    private String HOST = "http://luntan.qgmzbxs.com/";
+    private String HOST = "http://www.tsgzvore.com/";
     private String TITLE = "更新";
     private String CONTENT = "大家好，我是勤劳的催更新菌\n点击更新，让我们一起成为一天更新八次的暴躁老哥吧";
 
@@ -99,6 +102,45 @@ public class UpgradeModule extends ReactContextBaseJavaModule {
                 .method("GET", null)
                 .build();
         Call call = okHttpClient.newCall(request);
+        final Handler handler = new DoInstallHandler(this);
+        call.enqueue(new Callback() {
+            @Override
+            public void onFailure(Call call, IOException e) {
+                Log.e("PACKAGE DOWNLOAD", call.toString(), e);
+            }
+
+            @Override
+            public void onResponse(Call call, Response response) {
+                if (response.isSuccessful()) {
+                    if (response.body() == null) return;
+                    FileOutputStream fileOutputStream = null;
+                    InputStream stream = null;
+                    try {
+                        stream = response.body().byteStream();
+                        byte[] buffer = new byte[2048];
+                        int len = 0;
+                        long total = response.body().contentLength();
+                        File file = new File("update.apk");
+                        fileOutputStream = new FileOutputStream(file);
+                        long sum = 0;
+                        while ((len = stream.read(buffer)) != -1) {
+                            fileOutputStream.write(buffer, 0, len);
+                            sum += len;
+                        }
+                        fileOutputStream.flush();
+                    } catch (IOException e) {
+                        Log.e("REQUEST FAILED", "AAA", e);
+                    } finally {
+                        try {
+                            if (fileOutputStream != null) fileOutputStream.close();
+                            if (stream != null) stream.close();
+                        } catch (IOException e) {
+                            e.printStackTrace();
+                        }
+                    }
+                }
+            }
+        });
     }
 
     @ReactMethod
@@ -158,14 +200,26 @@ public class UpgradeModule extends ReactContextBaseJavaModule {
     }
 }
 
-final class ShowUpgradeAlertHandler extends Handler
+final class ShowUpgradeAlertHandler extends Handler {
-{
     private UpgradeModule module;
 
-    ShowUpgradeAlertHandler(UpgradeModule module)
+    ShowUpgradeAlertHandler(UpgradeModule module) {
-    {
         this.module = module;
     }
+
+    @Override
+    public void handleMessage(Message message) {
+        module._alertDialog();
+    }
+}
+
+final class DoInstallHandler extends Handler {
+    private UpgradeModule module;
+
+    DoInstallHandler(UpgradeModule module) {
+        this.module = module;
+    }
+
     @Override
     public void handleMessage(Message message) {
         module._alertDialog();