新版Flutter整合到已有Android專案的實現
FlutterSDK升級後,我們發現不能按照原來的方式整合到已有Android專案中了,因為沒有了Flutter這個類,通過閱讀原始碼我找到了新的使用方式。
一、建立Flutter Module
在已有Android工程中整合flutter,可以使用AndroidStudio的new Flutter Module實現,方便快捷。
找到FlutterModule,一連串的next操作即可
建立完成後我們的專案中會多一個叫做flutter的module
並且在專案的setting.gradle檔案中會自動新增如下幾行程式碼,
setBinding(new Binding([gradle:this])) evaluate( new File( settingsDir,'flutter_module/.android/include_flutter.groovy' ) ) include ':flutter_module'
最後我們只需在app的build.gradle中引用這個flutter模組即可
implementation project(path: ':flutter')
二、使用Flutter
兩種使用方式,FlutterView和FlutterFragment。
首先在Application中初始化
public class MVApplication extends Application { private static MVApplication instance; public static MVApplication getInstance(){ return instance; } @Override public void onCreate() { super.onCreate(); FlutterMain.Settings settings=new FlutterMain.Settings(); settings.setLogTag("MyFlutter"); FlutterMain.startInitialization(this,settings); String[] args = {"info","data"}; FlutterMain.ensureInitializationComplete(this,args); instance=this; } }
1、使用FlutterFragment
新版本的FlutterSDK不再支援已經沒有Flutter類,不再支援諸如Flutter.createView()、Flutter.createFragment()等用法,通過閱讀其原始碼我們可以找到FlutterFragment的新用法,程式碼如下:
public class MyFlutterActivity extends FragmentActivity { @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.flutter_layout); //FlutterFragment fragment=new FlutterFragment(); FlutterFragment fragment=FlutterFragment.withNewEngine().initialRoute("home").build(); getSupportFragmentManager().beginTransaction().add(R.id.flutter_container,fragment).commit(); } }
程式碼中FlutterFragment的建立也可以直接使用預設的構造方法,這樣載入main.dart中的預設路由,即''/'',給出的示例程式碼中我們通過呼叫FlutterFragment.withNewEngine().initialRoute("home").build()建立了新的NewEngineFragmentBuilder來構建指定路由的FlutterFragment。
2、使用FlutterView
FlutterView的建立同樣不能使用老版本的方法了,新版本的使用方法程式碼如下:
public class MyFlutterActivity extends FragmentActivity { @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.flutter_layout); FrameLayout frameLayout=findViewById(R.id.flutter_container); ProgressBar progress=findViewById(R.id.progress); //建立FlutterView FlutterView flutterView=new FlutterView(this); //建立FlutterView首幀渲染完成監聽 flutterView.addFirstFrameListener(new FlutterView.FirstFrameListener() { @Override public void onFirstFrame() { //隱藏進度條,顯示FlutterView progress.setVisibility(View.GONE); frameLayout.setVisibility(View.VISIBLE); } }); //建立dart程式碼執行器 DartExecutor executor=flutterView.getDartExecutor(); //執行main.dart中的main函式 executor.executeDartEntrypoint( new DartExecutor.DartEntrypoint(FlutterMain.findAppBundlePath(),"main")); //將FlutterView新增到佈局中 ViewGroup.LayoutParams layoutParams=new LinearLayout.LayoutParams(FrameLayout.LayoutParams.MATCH_PARENT,FrameLayout.LayoutParams.MATCH_PARENT); frameLayout.addView(flutterView); } }
佈局檔案如下:
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent"> <FrameLayout android:id="@+id/flutter_container" android:visibility="invisible" android:layout_width="match_parent" android:layout_height="match_parent"> </FrameLayout> <ProgressBar android:id="@+id/progress" android:layout_width="45dp" android:layout_height="45dp" android:layout_centerVertical="true" android:layout_centerHorizontal="true" android:visibility="visible" > </ProgressBar> </RelativeLayout>
效果如下圖:
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