标签：load min form string 构造 xtend 接口 ini mission
首先看MainActivity，
继承FlutterActivity
再看FlutterActivity代码，继承Activity，实现Provider、PluginRegistry、ViewFactory
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 private final FlutterActivityDelegate delegate = new FlutterActivityDelegate(this, this); private final FlutterActivityEvents eventDelegate; private final Provider viewProvider; private final PluginRegistry pluginRegistry; public FlutterActivity() { this.eventDelegate = this.delegate; this.viewProvider = this.delegate; this.pluginRegistry = this.delegate; } protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); this.eventDelegate.onCreate(savedInstanceState); }
一看delegate就知道代理模式
在生命周期onCrreate中，视图由eventDelegate创建，而该对象在构造函数中被初始化赋值，
FlutterActivityEvents 是一个接口类 继承了ActivityResultListener生命周期、RequestPermissionsResultListener权限请求、ComponentCallbacks2这个类先不管。
FlutterActivityDelegate 就是FlutterActivityEvents类的实现.
看FlutterActivityDelegate类中的onCreate函数
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 public void onCreate(Bundle savedInstanceState) { if (VERSION.SDK_INT >= 21) { Window window = this.activity.getWindow(); window.addFlags(-2147483648); window.setStatusBarColor(1073741824); window.getDecorView().setSystemUiVisibility(1280); } String[] args = getArgsFromIntent(this.activity.getIntent()); FlutterMain.ensureInitializationComplete(this.activity.getApplicationContext(), args); this.flutterView = this.viewFactory.createFlutterView(this.activity); if (this.flutterView == null) { FlutterNativeView nativeView = this.viewFactory.createFlutterNativeView(); this.flutterView = new FlutterView(this.activity, (AttributeSet)null, nativeView); this.flutterView.setLayoutParams(matchParent); this.activity.setContentView(this.flutterView); this.launchView = this.createLaunchView(); if (this.launchView != null) { this.addLaunchView(); } } if (!this.loadIntent(this.activity.getIntent())) { String appBundlePath = FlutterMain.findAppBundlePath(this.activity.getApplicationContext()); if (appBundlePath != null) { this.runBundle(appBundlePath); } } }
首先对android版本做了一个判断，当大于6.0，设置了状态栏颜色，和窗口模式。
android端与dart端通信
1、dart端调用android端代码
1、原生android代码
新建一个类TestPlugin 实现MethodChannel类里的内部接口类MethodCallHandler。
重写onMethodCall方法，在此处写需要实现的逻辑代码
最后是将插件绑定。
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 public class TestPlugin implements MethodChannel.MethodCallHandler { public static final String CHANNEL = "plugin/test"; static MethodChannel channel; // 上下文 private Activity activity; private TestPlugin(Activity activity) { this.activity = activity; } public static void registerWith(PluginRegistry.Registrar registrar) { channel = new MethodChannel(registrar.messenger(), CHANNEL); TestPlugin plugin = new TestPlugin(registrar.activity()); // 在此通道上接受方法调用的回调 channel.setMethodCallHandler(plugin); } @Override public void onMethodCall(MethodCall methodCall, MethodChannel.Result result) { if(methodCall.method.equals("test")) { Toast.makeText(activity.getApplicationContext(), "测试dart调用android原生插件", Toast.LENGTH_SHORT).show(); result.success("调用成功"); } // 当未找到该函数 result.notImplemented(); } }
在MainActivity中绑定
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 public class MainActivity extends FlutterActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); GeneratedPluginRegistrant.registerWith(this); registerPlugin(this); } private void registerPlugin(PluginRegistry registry) { TestPlugin.registerWith(registry.registrarFor(TestPlugin.CHANNEL)); } }
2、在dart中调用该原生方法
1 2 3 4 5 6 7 static const _platform = const MethodChannel(‘plugin/test‘); _toast() { /// 调用原生的方法 _platform.invokeMethod(‘test‘); }
一个原生插件调用就完成了。
原文:大专栏 flutter android端 原理解析
flutter android端 原理解析
标签：load min form string 构造 xtend 接口 ini mission
原文地址：https://www.cnblogs.com/petewell/p/11445383.html
