142 lines
3.6 KiB
Markdown
142 lines
3.6 KiB
Markdown
Calling Android functions from Qt without using JNI
|
||
===========================
|
||
|
||
It is a fork of the [Quick Android](https://github.com/benlau/quickandroid) project that aims to provide a library to access Android functions from Qt/QML without using JNI.
|
||
|
||
Remarks: This project only support gradle build system.
|
||
|
||
Features
|
||
========
|
||
|
||
1. SystemDispatcher - A message queue for C++/Qt and Java/Android
|
||
1. Send message in C++, receive in Java and vice versa.
|
||
1. Data type will be converted automatically (e.g QMap <-> java.util.Map). No need to write in JNI.
|
||
1. It could be used to write your own Java code
|
||
1. Bundled Components
|
||
1. Image Picker
|
||
1. Toast
|
||
1. Wrapper of android.os.Environment / android.os.Debug / MediaScannerConnection
|
||
|
||
C++ API
|
||
=======
|
||
|
||
1. Environment::getExternalStoragePublicDirectory()
|
||
1. MediaScannerConnection::scanFile()
|
||
1. Debug::getNativeHeapSize()
|
||
1. Debug::getNativeHeapAllocatedSize()
|
||
|
||
The functions above do not require to config gradle before using.
|
||
|
||
QML Components
|
||
==============
|
||
|
||
```
|
||
import AndroidNative 1.0
|
||
```
|
||
|
||
1. ImagePicker
|
||
1. Toast
|
||
|
||
|
||
SystemDispatcher
|
||
================
|
||
|
||
SystemDispatcher is a message queue component for delivering action message between C++/QML and Java. Data type in message is converted to the target platform automatically (e.g QMap <-> java.util.Map) . So that user doesn't need to write JNI to access their Java functions.
|
||
|
||
Moreover, SystemDispatcher is compilable on a non-Android platform. It doesn't cause any trouble to run on your development host.
|
||
|
||
```
|
||
// C++ Example
|
||
|
||
#include <AndroidNative>
|
||
|
||
// Load a Java class. It will trigger the code within `static` block
|
||
SystemDispatcher::instance()->loadClass("androidnative.example.ExampleService");
|
||
|
||
QVariantMap message;
|
||
message["value1"] = 1;
|
||
message["value2"] = 2.0;
|
||
message["value3"] = "3";
|
||
|
||
// Dispatch a message
|
||
SystemDispatcher::instance()->dispatch("androidnative.example.dummyAction", message);
|
||
|
||
```
|
||
|
||
```
|
||
// QML Example
|
||
|
||
import AndroidNative 1.0
|
||
|
||
Item {
|
||
|
||
Component.onCompleted: {
|
||
var message = {
|
||
value1: 1,
|
||
value2: 2.0,
|
||
value3: "3"
|
||
}
|
||
SystemDispatcher.dispatch("androidnative.example.dummyAction", message);
|
||
}
|
||
}
|
||
```
|
||
|
||
```
|
||
// Java Receiver
|
||
|
||
public class ExampleService {
|
||
|
||
static {
|
||
|
||
SystemDispatcher.addListener(new SystemDispatcher.Listener() {
|
||
|
||
public void onDispatched(String type , Map message) {
|
||
|
||
if (type.equals("androidnative.example.dummyAction")) {
|
||
// Process then dispatch a response back to C++/QML
|
||
SystemDispatcher.dispatch(("androidnative.example.response");
|
||
|
||
return;
|
||
}
|
||
return;
|
||
}
|
||
});
|
||
}
|
||
}
|
||
|
||
```
|
||
|
||
```
|
||
// Listen from QML
|
||
|
||
Connections {
|
||
target: SystemDispatcher
|
||
onDispatched: {
|
||
// process the message
|
||
}
|
||
}
|
||
```
|
||
|
||
|
||
Supported data type:
|
||
|
||
| Qt | Java |
|
||
|--------------|---------|
|
||
| int | int |
|
||
| bool | boolean |
|
||
| QString | String |
|
||
| QVariantList | List<T> |
|
||
| QVariantMap | Map<T> |
|
||
|
||
Installation Instruction
|
||
========================
|
||
|
||
[androidnative.pri/installation.md at master · benlau/androidnative.pri](https://github.com/benlau/androidnative.pri/blob/master/docs/installation.md)
|
||
|
||
Example
|
||
=======
|
||
|
||
An example program is available at: [androidnative.pri/examples/androidnativeexample at master · benlau/androidnative.pri](https://github.com/benlau/androidnative.pri/tree/master/examples/androidnativeexample)
|
||
|
||
|