Merge pull request #27 from koreader/chrox-master

Implement io.popen

AndroidManifest.xml

@@ -5,6 +5,7 @@
       android:versionName="1.0">
     <uses-sdk android:minSdkVersion="9" />
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
+    <uses-permission android:name="android.permission.WRITE_SETTINGS" />
     <uses-permission android:name="android.permission.INTERNET" />
     <application android:label="@string/app_name"
         android:hasCode="false" android:debuggable="true"

assets/android.lua

@@ -991,21 +991,63 @@ end
 function JNI:callObjectMethod(object, method, signature, ...)
     local clazz = self.env[0].GetObjectClass(self.env, object)
     local methodID = self.env[0].GetMethodID(self.env, clazz, method, signature)
+    self.env[0].DeleteLocalRef(self.env, clazz)
     return self.env[0].CallObjectMethod(self.env, object, methodID, ...)
 end
 
 function JNI:callIntMethod(object, method, signature, ...)
     local clazz = self.env[0].GetObjectClass(self.env, object)
     local methodID = self.env[0].GetMethodID(self.env, clazz, method, signature)
+    self.env[0].DeleteLocalRef(self.env, clazz)
     return self.env[0].CallIntMethod(self.env, object, methodID, ...)
 end
 
+function JNI:callStaticIntMethod(class, method, signature, ...)
+    local clazz = self.env[0].FindClass(self.env, class)
+    local methodID = self.env[0].GetStaticMethodID(self.env, clazz, method, signature)
+    self.env[0].DeleteLocalRef(self.env, clazz)
+    return self.env[0].CallStaticIntMethod(self.env, clazz, methodID, ...)
+end
+
+function JNI:callStaticBooleanMethod(class, method, signature, ...)
+    local clazz = self.env[0].FindClass(self.env, class)
+    local methodID = self.env[0].GetStaticMethodID(self.env, clazz, method, signature)
+    local res = self.env[0].CallStaticBooleanMethod(self.env, clazz, methodID, ...)
+    self.env[0].DeleteLocalRef(self.env, clazz)
+    return res
+end
+
+function JNI:callStaticObjectMethod(class, method, signature, ...)
+    local clazz = self.env[0].FindClass(self.env, class)
+    local methodID = self.env[0].GetStaticMethodID(self.env, clazz, method, signature)
+    local res = self.env[0].CallStaticObjectMethod(self.env, clazz, methodID, ...)
+    self.env[0].DeleteLocalRef(self.env, clazz)
+    return res
+end
+
 function JNI:getObjectField(object, field, signature)
     local clazz = self.env[0].GetObjectClass(self.env, object)
     local fieldID = self.env[0].GetFieldID(self.env, clazz, field, signature)
+    self.env[0].DeleteLocalRef(self.env, clazz)
     return self.env[0].GetObjectField(self.env, object, fieldID)
 end
 
+function JNI:setObjectField(object, field, signature, value)
+    local clazz = self.env[0].GetObjectClass(self.env, object)
+    local fieldID = self.env[0].GetFieldID(self.env, clazz, field, signature)
+    self.env[0].SetObjectField(self.env, object, fieldID, value)
+    self.env[0].DeleteLocalRef(self.env, clazz)
+    return object
+end
+
+function JNI:setFloatField(object, field, signature, value)
+    local clazz = self.env[0].GetObjectClass(self.env, object)
+    local fieldID = self.env[0].GetFieldID(self.env, clazz, field, signature)
+    self.env[0].SetFloatField(self.env, object, fieldID, value)
+    self.env[0].DeleteLocalRef(self.env, clazz)
+    return object
+end
+
 function JNI:to_string(javastring)
     local utf = self.env[0].GetStringUTFChars(self.env, javastring, nil)
     local luastr = ffi.string(utf, self.env[0].GetStringUTFLength(self.env, javastring))
@@ -1153,9 +1195,106 @@ local function run(android_app_state)
                 JNI:callIntMethod(display, "getWidth", "()I"),
                 JNI:callIntMethod(display, "getHeight", "()I")
         end)
+    android.get_screen_brightness = function()
+        return JNI:context(android.app.activity.vm, function(JNI)
+            local str_brightness = JNI.env[0].NewStringUTF(JNI.env, "screen_brightness")
+            local res = JNI:callStaticIntMethod(
+                "android/provider/Settings$System",
+                "getInt",
+                "(Landroid/content/ContentResolver;Ljava/lang/String;)I",
+                JNI:callObjectMethod(
+                    android.app.activity.clazz,
+                    "getContentResolver",
+                    "()Landroid/content/ContentResolver;"
+                ),
+                str_brightness
+                )
+            JNI.env[0].DeleteLocalRef(JNI.env, str_brightness)
+            return res
+        end)
+    end
+    android.set_screen_brightness = function(brightness)
+        android.LOGI("set screen brightness "..brightness)
+        return JNI:context(android.app.activity.vm, function(JNI)
+            local str_brightness = JNI.env[0].NewStringUTF(JNI.env, "screen_brightness")
+            local res = JNI:callStaticBooleanMethod(
+                "android/provider/Settings$System",
+                "putInt",
+                "(Landroid/content/ContentResolver;Ljava/lang/String;I)Z",
+                JNI:callObjectMethod(
+                    android.app.activity.clazz,
+                    "getContentResolver",
+                    "()Landroid/content/ContentResolver;"
+                ),
+                str_brightness,
+                brightness
+                )
+            JNI.env[0].DeleteLocalRef(JNI.env, str_brightness)
+            --[[
+            if res then
+                local window = JNI:callObjectMethod(
+                    android.app.activity.clazz,
+                    "getWindow",
+                    "()Landroid/view/Window;"
+                )
+                JNI:callObjectMethod(
+                    window,
+                    "setAttributes",
+                    "(Landroid/view/WindowManager$LayoutParams;)V",
+                    JNI:setFloatField(JNI:callObjectMethod(
+                        window,
+                        "getAttributes",
+                        "()Landroid/view/WindowManager$LayoutParams;"
+                    ), "screenBrightness", "F", brightness/255)
+                )
+            end
+            --]]
+            return res
+        end)
+    end
+    io.popen = function(prog, mode)
+        mode = mode or "r"
+        if mode ~= "r" then
+            android.LOGI("io.popen currently only supports read mode")
+            return
+        end
+        android.LOGI("run program "..prog)
+        return JNI:context(android.app.activity.vm, function(JNI)
+            local program = JNI.env[0].NewStringUTF(JNI.env, prog)
+            local stdout = JNI:callObjectMethod(
+                JNI:callObjectMethod(
+                    JNI:callStaticObjectMethod(
+                        "java/lang/Runtime",
+                        "getRuntime",
+                        "()Ljava/lang/Runtime;"
+                    ),
+                    "exec",
+                    "(Ljava/lang/String;)Ljava/lang/Process;",
+                    program
+                ),
+                "getInputStream",
+                "()Ljava/io/InputStream;"
+            )
+            local tmp_file = android.dir .. "/io.popen.tmp"
+            local tmp = io.open(tmp_file, "w")
+            while true do
+                local char = JNI:callIntMethod(stdout, "read", "()I")
+                if char >= 0 then
+                    tmp:write(string.char(char))
+                else
+                    tmp:close()
+                    break
+                end
+            end
+            JNI.env[0].DeleteLocalRef(JNI.env, program)
+            JNI.env[0].DeleteLocalRef(JNI.env, stdout)
+            return io.open(tmp_file, "r")
+        end)
+    end
     android.LOGI("Application data directory "..android.dir)
     android.LOGI("Application library directory "..android.nativeLibraryDir)
     android.LOGI("Screen size "..android.screen.width.."x"..android.screen.height)
+    android.LOGI("Screen brightness "..android.get_screen_brightness())
 
     -- register the "android" module (ourself)
     package.loaded.android = android