Flutter 内嵌 android 原生 View以及相互跳转
- 一. 内嵌android 原生View
- 二、android 与 flutter 相互跳转
一. 内嵌android 原生View
-
在android 工程的包名下，也可在MainActivity创建 android 原生view ，继承PlatformView
// 1.自定义textview
public static class MyTextView implements PlatformView{private TextView textView ; /** * * @param context * @param messenger 用于消息传递 * @param id 生成时会分配一个唯一 ID * @param maps Flutter 传递的初始化参数。 */ public MyTextView(Context context ,BinaryMessenger messenger,int id,Map<String,Object> maps) { textView = new TextView(context); textView.setText("我是来自android原生的textView"); if (maps != null){ String text = maps.get("text").toString(); textView.setText(text); } textView.setTextColor(Color.RED); } // 返回要嵌入 Flutter 层次结构的Android View @Nullable @Override public View getView() { return textView; } //释放此View时调用，此方法调用后 View 不可用，此方法需要清除所有对象引用，否则会造成内存泄漏。 @Override public void dispose() { }}
-
新建MyViewFactory.java注册PlatformView
public class MyViewFactory extends PlatformViewFactory {
private final BinaryMessenger messenger;
public MyViewFactory(BinaryMessenger messenger) {
super(StandardMessageCodec.INSTANCE);
this.messenger = messenger;
}
@SuppressWarnings("unchecked")
@Override
public PlatformView create(Context context, int id, Object args) {
Map<String, Object> params = (Map<String, Object>) args;
return new MainActivity.MyTextView(context, messenger, id, params);
}
}
- 创建plugin
public class MyViewFlutterPlugin implements FlutterPlugin {
@Override
public void onAttachedToEngine(@NonNull FlutterPluginBinding binding) {
BinaryMessenger binaryMessenger = binding.getBinaryMessenger();
binding.getPlatformViewRegistry().registerViewFactory(
"plugins.nightfarmer.top/myview",
new MyViewFactory(binaryMessenger));
}
@Override
public void onDetachedFromEngine(@NonNull FlutterPluginBinding binding) {
}
}
- 在MainActivy 中注册
@Override
public void configureFlutterEngine(@NonNull FlutterEngine flutterEngine) {
super.configureFlutterEngine(flutterEngine);
flutterEngine.getPlugins().add(new MyViewFlutterPlugin());
}
- 在flutter 中使用
Container(
width: 100,
height: 100,
child: AndroidView(
viewType: "plugins.nightfarmer.top/myview",
creationParams: {'text':'Flutter传给AndroidTextView的参数'},
creationParamsCodec: StandardMessageCodec(),
),
),
二、android 与 flutter 相互跳转
- flutter 挑战到 原生Activity
var platform = MethodChannel('com.example.flutter/native_channel');
void goToNativeActivity() {
platform.invokeMethod('goToNative');
}
在MainActivty 中注册通道跳转到TestActivity
private static final String CHANNEL = "com.example.flutter/native_channel";
@Override
public void configureFlutterEngine(@NonNull FlutterEngine flutterEngine) {
super.configureFlutterEngine(flutterEngine);
flutterEngine.getPlugins().add(new MyViewFlutterPlugin());
//注册通道
new MethodChannel(flutterEngine.getDartExecutor().getBinaryMessenger(), CHANNEL).setMethodCallHandler(
(call, result) -> {
// 接收来自Flutter的方法调用
if (call.method.equals("goToNative")) {
Intent intent = new Intent(MainActivity.this, TestActivity.class);
startActivity(intent);
result.success(true);
} else {
result.notImplemented();
}
}
);
}
- Activity 中跳转Flutter页面
在Manifest.xml 中注册
<activity
android:name="io.flutter.embedding.android.FlutterActivity"
android:theme="@style/LaunchTheme"
android:configChanges="orientation|keyboardHidden|keyboard|screenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
android:hardwareAccelerated="true"
android:windowSoftInputMode="adjustResize"
/>
根据路由跳转到Flutter 页面
startActivity(
FlutterActivity
.withNewEngine()
.initialRoute("/my_route")
// .withCachedEngine("engine_id")
.build(currentActivity)
);
跳转会与 2s的黑屏情况，在MyApp中
public class MyApp extends Application {
private FlutterEngine fe ;
@Override
public void onCreate() {
super.onCreate();
// 解决原生挑战到 flutter 会有2s 黑屏 的问题
fe = new FlutterEngine(this);
fe.getDartExecutor().executeDartEntrypoint(DartExecutor.DartEntrypoint.createDefault());
FlutterEngineCache.getInstance().put("engine_id",fe);
}
//当application 销毁的时候调用
@Override
public void onTerminate() {
//销毁flutter引擎
fe.destroy();
super.onTerminate();
}
}
在清单文件中注册 MyApp
<application
android:name="com.qxx.ai_score_manager_flutter.MyApp">
