本文主要嘗試解決如下幾個問題：
- 如何在在已經項目加入Flutter
- 混合跳轉
- 混合棧問題
- 混合棧數據問題
跳轉黑屏是因為debug的緣故，打release包則沒有。
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1. 如何在在已經項目加入Flutter
直接參考這篇文章Add Flutter to existing apps
2. 混合跳轉
首先：Android跳轉到Flutter
創(chuàng)建一個FlutterActivity
直接繼承FlutterActivity或者自定義一個CustomFlutterActivity，我用的自定義，是做了一些封裝和flutter插件注冊
public abstract class CustomFlutterActivity extends AppCompatActivity implements FlutterView.Provider, PluginRegistry, FlutterActivityDelegate.ViewFactory {
private final FlutterActivityDelegate delegate = new FlutterActivityDelegate(this, this);
private final FlutterActivityEvents eventDelegate;
private final FlutterView.Provider viewProvider;
private final PluginRegistry pluginRegistry;
public CustomFlutterActivity() {
this.eventDelegate = this.delegate;
this.viewProvider = this.delegate;
this.pluginRegistry = this.delegate;
}
@Override
protected void onCreate(Bundle savedInstanceState) {
if (injectRouter())
ARouter.getInstance().inject(this);
super.onCreate(savedInstanceState);
this.eventDelegate.onCreate(savedInstanceState);
GeneratedPluginRegistrant.registerWith(this);
registerCustomPlugin(this);
}
protected boolean injectRouter() {
return false;
}
//省略部分代碼
.........
.........
private static void registerCustomPlugin(PluginRegistry registrar) {
FlutterPluginJumpToAct.registerWith(registrar.registrarFor(FlutterPluginJumpToAct.CHANNEL));
}
}
做一個Flutter用的容器，通過容器統一管理需要跳轉的Flutter界面
@Route(path = RouterPath.MainPath.MAIN_FLUTTER_CONTAINER, name = "FlutterContainerActivity")
public class FlutterContainerActivity extends CustomFlutterActivity {
private static String CHANNEL = "com.jzhu.msg/plugin";
private static int TIME_ONE_SECOND = 1000;
@Autowired(name = "path")
String path;
@Override
protected boolean injectRouter() {
return true;
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
initBasicMessageChannel();
}
@Override
public FlutterView createFlutterView(Context context) {
WindowManager.LayoutParams matchParent = new WindowManager.LayoutParams(-1, -1);
FlutterNativeView nativeView = this.createFlutterNativeView();
FlutterView flutterView = new FlutterView(FlutterContainerActivity.this, (AttributeSet) null, nativeView);
flutterView.setInitialRoute(path);
flutterView.setLayoutParams(matchParent);
this.setContentView(flutterView);
return flutterView;
}
private void initBasicMessageChannel() {
switch (path) {
case RouterPath.ModuleFlutterPath.FLUTTER_HOME:
initHomeBasicMessage();
break;
case RouterPath.ModuleFlutterPath.FLUTTER_TEST:
initTestBasicMessage();
break;
}
}
private void initTestBasicMessage() {
BasicMessageChannel channel = new BasicMessageChannel<String>(
getFlutterView(), CHANNEL, StringCodec.INSTANCE);
channel.setMessageHandler((o, reply) -> {
ToastUtils.show((String)o,3000);
reply.reply("FlutterContainerActivity：回條消息給你");
});
new Handler().postDelayed(() -> channel.send("FlutterContainerActivity：發(fā)條消息給你"), TIME_ONE_SECOND);
}
private void initHomeBasicMessage() {
//todo
}
}
Flutter提供的頁面
void main() {
runApp(new MaterialApp(
routes: <String, WidgetBuilder>{
'/homepage': (BuildContext context) => new MyHomePage(),
'/testpage': (BuildContext context) => new TestPage(),
}, home: new MyHomePage()));
}
路由
public interface RouterPath {
interface MainPath{
String MAIN_FLUTTER_CONTAINER = "/main/FlutterContainerActivity";
String MAIN_TEST= "/main/TestActivity";
}
interface ModuleFlutterPath{
String FLUTTER_HOME= "/homepage";
String FLUTTER_TEST= "/testpage";
}
}
點擊跳轉
ARouter.getInstance()
.build(RouterPath.MainPath.MAIN_FLUTTER_CONTAINER)
.withString("path", RouterPath.ModuleFlutterPath.FLUTTER_HOME)
.navigation();
最后：Flutter跳轉到Android
通過插件實現，用法參考我之前寫一篇Flutter知識點: Flutter與原生(Android)的交互
3. 混合棧問題
- 如果是Android的頁面跳轉到Android頁面，所以就是普通的Activity棧。
- 如果是Android的頁面跳轉到Flutter頁面，那么都使用了我們的容器FlutterContainerActivity，所以就是普通的Activity棧，這里面遇到個坑，下面會提出并嘗試解決。
- 如果是Flutter的頁面跳轉到Flutter頁面，那么由Flutter自己內部的棧管理。
- 如果是Flutter的頁面跳轉到Android頁面，那么自己管自己就好啦。
如果你把Flutter的頁面全裝到到容器FlutterContainerActivity展示，那就都是普通的Activity棧，省事！
混合跳轉注意：
- Android某些頁面的啟動模式Standard，SingleTop，SingleTask，SingleInstance
- Flutter頁面也存在一些特殊的跳轉，popAndPushNamed，pushNamedAndRemoveUntil，popUntil，pushReplacementNamed
以上需要根據實際情況處理，存在特殊跳轉，銷毀等邏輯
開發(fā)中需要特別需要注意的一個問題：
跳轉順序：Android頁面 -> Flutter頁面（使用了FlutterContainerActivity）-> Flutter頁面（原始）
期望結果：Flutter頁面（原始）-> Flutter頁面（使用了FlutterContainerActivity）-> Android頁面
真實結果：Flutter頁面（原始）-> Flutter頁面（使用了FlutterContainerActivity）-> Flutter頁面（homepage） -> Android頁面
得到疑問：我們并沒有啟動homepage，為什么多了一個homepage？
代碼猜想：Flutter棧里初始化了一個homepage， 其他Flutter的頁面都在這個棧之上。
void main() {
runApp(new MaterialApp(
routes: <String, WidgetBuilder>{
............
}, home: new MyHomePage()));
}
如何解決：使用SystemNavigator.pop()，
Tells the operating system to close the application, or the closest equivalent.
WillPopScope參考這篇Flutter學習中的問題記錄: 如何監(jiān)聽實體/虛擬返回鍵和AppBar返回鍵
class _MyHomePageState extends State<MyHomePage> {
static const jumpPlugin = const MethodChannel('com.jzhu.jump/plugin');
Future<Null> _jumpToNative() async {
Map<String, String> map = {"path": "/main/TestActivity"};
String result = await jumpPlugin.invokeMethod('jump2act', map);
print(result);
}
Future<bool> _requestPop() {
SystemNavigator.pop();
return new Future.value(false);
}
@override
Widget build(BuildContext context) {
return new WillPopScope(
child: new Scaffold(
appBar: new AppBar(
title: new Text("Home Page"),
),
body: new Center(
child: new RaisedButton(
child: new Text("跳到TestActivity"), onPressed: _jumpToNative),
),
// This trailing comma makes auto-formatting nicer for build methods.
),
onWillPop: _requestPop);
}
}
4. 混合棧數據問題，以插件的方式解決 。
MethodChannel，EventChanneld的數據傳輸，用法參考我之前寫一篇Flutter知識點: Flutter與原生(Android)的交互
主要舉例BasicMessageChannel和BinaryMessages
1_Sd6s3EDGkU8TBS9xLc4Zvw.png
FlutterContainerActivity中初始化，監(jiān)聽，發(fā)送
為什么要延遲發(fā)送？
因為FlutterView可能還沒初始化，這時候無法接收消息
private static String CHANNEL = "com.jzhu.msg/plugin";
private static String CHANNEL_BINARY = "com.jzhu.msg.binary/plugin";
private static int TIME_ONE_SECOND = 1000;
private void initTestBasicMessage() {
BasicMessageChannel channel = new BasicMessageChannel<String>(
getFlutterView(), CHANNEL, StringCodec.INSTANCE);
channel.setMessageHandler((o, reply) -> {
ToastUtils.show((String)o,3000);
reply.reply("FlutterContainerActivity：回條消息給你");
});
new Handler().postDelayed(() -> channel.send("FlutterContainerActivity：發(fā)條消息給你"), TIME_ONE_SECOND);
ByteBuffer message = ByteBuffer.allocateDirect(256);
message.putDouble(3.14);
message.putInt(123456789);
new Handler().postDelayed(() -> getFlutterView().send(CHANNEL_BINARY,message), TIME_ONE_SECOND);
getFlutterView().setMessageHandler(CHANNEL_BINARY, (byteBuffer, binaryReply) -> {
byteBuffer.order(ByteOrder.nativeOrder());
double x = byteBuffer.getDouble();
int n = byteBuffer.getInt();
Log.i("zj", "Received: "+x+ " and "+ n);
binaryReply.reply(message);
});
}
Flutter中監(jiān)聽，發(fā)送
static const channel = const BasicMessageChannel<String>('com.jzhu.msg/plugin', StringCodec());
static const String channelBinary = 'com.jzhu.msg.binary/plugin';
void _sendMsg2Android() async {
_replyMsg = await channel.send('TestPage：發(fā)條消息給你');
setState(() {});
final WriteBuffer buffer = WriteBuffer()
..putFloat64(3.14)
..putInt32(123456789);
final ByteData message = buffer.done();
_replyBinaryMsg = await BinaryMessages.send(channelBinary, message);
_decodeData(message);
}
void _initMessageHandler() {
channel.setMessageHandler((String message) async {
_receivedMsg = message;
setState(() {});
});
BinaryMessages.setMessageHandler(channelBinary, (ByteData message) async {
_decodeData(message);
});
}
void _decodeData(ByteData message){
final ReadBuffer readBuffer = ReadBuffer(message);
final double x = readBuffer.getFloat64();
final int n = readBuffer.getInt32();
print('Received $x and $n');
}
