把生成密钥的结果记录在文件中，供调用方查询

app/build.gradle

@@ -9,8 +9,8 @@ android {
         applicationId "com.xypower.secapp"
         minSdk 28
         targetSdk 28
-        versionCode 1
-        versionName "1.0"
+        versionCode 2
+        versionName "1.1"
 
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
         externalNativeBuild {

app/release/release/output-metadata.json

@@ -0,0 +1,20 @@
+{
+  "version": 3,
+  "artifactType": {
+    "type": "APK",
+    "kind": "Directory"
+  },
+  "applicationId": "com.xypower.secapp",
+  "variantName": "release",
+  "elements": [
+    {
+      "type": "SINGLE",
+      "filters": [],
+      "attributes": [],
+      "versionCode": 2,
+      "versionName": "1.1",
+      "outputFile": "app-release.apk"
+    }
+  ],
+  "elementType": "File"
+}

app/src/androidTest/java/com/xinyingpower/myapplication/ExampleInstrumentedTest.java

@@ -1,25 +0,0 @@
-package com.xypower.secapp;
-
-import android.content.Context;
-import android.support.test.InstrumentationRegistry;
-import android.support.test.runner.AndroidJUnit4;
-
-import org.junit.Test;
-import org.junit.runner.RunWith;
-
-import static org.junit.Assert.*;
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
- */
-@RunWith(AndroidJUnit4.class)
-public class ExampleInstrumentedTest {
-    @Test
-    public void useAppContext() {
-        // Context of the app under test.
-        Context appContext = InstrumentationRegistry.getInstrumentation().getTargetContext();
-        assertEquals("com.xinyingpower.myapplication", appContext.getPackageName());
-    }
-}

app/src/main/java/com/xypower/secapp/CertActivity.java

@@ -16,6 +16,7 @@ import android.widget.TextView;
 import com.dowse.devicesdk.DsDeviceSdk;
 
 import java.io.File;
+import java.io.FileOutputStream;
 import java.text.SimpleDateFormat;
 import java.util.Date;
 
@@ -132,6 +133,25 @@ public class CertActivity extends AppCompatActivity {
         //
     }
 
+    protected static void writeTextFile(String path, String content) {
+        FileOutputStream fileOutputStream = null;
+        try {
+            fileOutputStream = new FileOutputStream(path);
+            byte[] bytes = content.getBytes();
+            fileOutputStream.write(bytes);
+        } catch (Exception ex) {
+
+        } finally {
+            if (fileOutputStream != null) {
+                try {
+                    fileOutputStream.close();
+                } catch (Exception ex) {
+
+                }
+            }
+        }
+    }
+
     protected void handleCommand(Intent intent) {
 
         final String action = intent.getStringExtra("action");
@@ -157,7 +177,10 @@ public class CertActivity extends AppCompatActivity {
                 }
             } else if (TextUtils.equals(action, ACTION_GEN_KEYS)) {
                 int index = intent.getIntExtra("index", 0);
+                String path = intent.getStringExtra("path");
+                ensureDirectoryExisted(path);
                 boolean res = MicroPhotoService.genKeys(index);
+                writeTextFile(path, res ? "1" : "0");
             } else if (TextUtils.equals(action, ACTION_CERT_REQ)) {
                 int index = intent.getIntExtra("index", 0);
                 int type = intent.getIntExtra("type", 0);

app/src/test/java/com/xypower/secapp/ExampleUnitTest.java

@@ -1,17 +0,0 @@
-package com.xypower.secapp;
-
-import org.junit.Test;
-
-import static org.junit.Assert.*;
-
-/**
- * Example local unit test, which will execute on the development machine (host).
- *
- * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
- */
-public class ExampleUnitTest {
-    @Test
-    public void addition_isCorrect() {
-        assertEquals(4, 2 + 2);
-    }
-}