flutter android 开发笔记(四.根据路由进入不同的flutter页面)
如果一个页面有多个flutterView或者不同activity加载不同flutterView，需要设置不同标识作为flutter的路由表，不同路由标识加载不同的flutterview
关键代码：
//java代码
mFlutter2Engine = new FlutterEngine(this);
mFlutter2Engine.getNavigationChannel().setInitialRoute("route2");//设置加载的flutterView的路由标识
mFlutter1Engine = new FlutterEngine(this);
mFlutter1Engine.getNavigationChannel().setInitialRoute("route1");//设置加载的flutterView的路由标识
//flutter入口代码，通过路由标识，加载不同的布局
void main() { var defaultRouteName = window.defaultRouteName; if("route1" == defaultRouteName){ runApp(new MaterialApp( title: "route1", home: new Scaffold( appBar: new AppBar( title: new Text("route1"), ), body: new HomeApp(), ), )); } else if("route2" == defaultRouteName){ runApp(MyApp()); }else{ runApp(new Container( child: new Text("default"), )); } }
Flutter1Activity.java代码
package xyz.djytest.flutter_test_native_project;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.FrameLayout;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import io.flutter.embedding.android.FlutterView;
import io.flutter.embedding.engine.FlutterEngine;
import io.flutter.embedding.engine.FlutterEngineCache;
import io.flutter.embedding.engine.dart.DartExecutor;
import io.flutter.embedding.engine.renderer.FlutterUiDisplayListener;
import io.flutter.plugin.common.MethodCall;
import io.flutter.plugin.common.MethodChannel;
public class Flutter1Activity extends AppCompatActivity {
FlutterEngine mFlutter1Engine;
FlutterView mFlutter1View;
MethodChannel mFlutter1MethodChannel1;
String flutter1Name = "default is null";
Button mButton1,mButton2;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// 通过FlutterView引入Flutter编写的页面
setContentView(R.layout.activity_flutter1);
initFlutterEngine();
mFlutter1View = createFlutterView();
mButton1 = findViewById(R.id.button1);
mButton1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (mFlutter1MethodChannel1!=null){
Log.d("TAG","mButton1 java 调用 flutter");
mFlutter1MethodChannel1.invokeMethod("getFlutterName", flutter1Name, new MethodChannel.Result() {
@Override
public void success(Object result) {
flutter1Name = (String) result;
mButton1.setText(flutter1Name);
}
@Override
public void error(String errorCode, String errorMessage, Object errorDetails) {
Log.d("TAG","errorCode = "+ errorCode + ",errorMessage = "+errorMessage);
}
@Override
public void notImplemented() {
Log.d("TAG","flutter 端没有实现 getFlutterName");
}
});
}
}
});
mButton2 = findViewById(R.id.checkFlutterMap);
mButton2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (mFlutter1MethodChannel1!=null){
Log.d("TAG","mButton2 java 调用 flutter");
mFlutter1MethodChannel1.invokeMethod("checkFlutterMap", null, new MethodChannel.Result() {
@Override
public void success(Object result) {
String flutterMapStr = (String) result;
Log.d("TAG","flutterMapStr = "+ flutterMapStr);
}
@Override
public void error(String errorCode, String errorMessage, Object errorDetails) {
Log.d("TAG","errorCode = "+ errorCode + ",errorMessage = "+errorMessage);
}
@Override
public void notImplemented() {
Log.d("TAG","flutter 端没有实现 checkFlutterMap");
}
});
}
}
});
// 关键代码，将Flutter页面显示到FlutterView中
mFlutter1View.attachToFlutterEngine(mFlutter1Engine);
}
private FlutterView createFlutterView() {
FlutterView flutterView = new FlutterView(this);
FrameLayout.LayoutParams lp = new FrameLayout.LayoutParams(
ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.MATCH_PARENT);
FrameLayout flContainer = findViewById(R.id.fl_flutter);
flContainer.addView(flutterView, lp);
flContainer.setVisibility(View.INVISIBLE);
FlutterUiDisplayListener listener = new FlutterUiDisplayListener() {
@Override
public void onFlutterUiDisplayed() {
flContainer.setVisibility(View.VISIBLE);
}
@Override
public void onFlutterUiNoLongerDisplayed() {
}
};
flutterView.addOnFirstFrameRenderedListener(listener);
return flutterView;
}
private void initFlutterEngine() {
mFlutter1Engine = FlutterEngineCache.getInstance().get("flutter1");
if (mFlutter1Engine == null){
mFlutter1Engine = new FlutterEngine(this);
mFlutter1Engine.getNavigationChannel().setInitialRoute("route1");
initChannel(mFlutter1Engine);
mFlutter1Engine.getDartExecutor().executeDartEntrypoint(
DartExecutor.DartEntrypoint.createDefault()
);
FlutterEngineCache.getInstance().put("flutter1", mFlutter1Engine);
}
}
private void initChannel(FlutterEngine flutterEngine) {
mFlutter1MethodChannel1 = new MethodChannel(flutterEngine.getDartExecutor(), "flutter1/flutter2Java");
mFlutter1MethodChannel1.setMethodCallHandler(new MethodChannel.MethodCallHandler() {
@Override
public void onMethodCall(MethodCall call, MethodChannel.Result result) {
if (call == null || result == null){
if (result!=null){
result.error("-1","MethodCall is null",new Exception("MethodCall is null"));
}
return;
}
if ("getInt".equals(call.method)){
result.success(Integer.MAX_VALUE);
}if ("getLong".equals(call.method)){
result.success(Long.MAX_VALUE);
}else {
result.notImplemented();
}
}
});
}
@Override
protected void onResume() {
super.onResume();
mFlutter1Engine.getLifecycleChannel().appIsResumed();
}
@Override
protected void onStart() {
super.onStart();
}
@Override
protected void onRestart() {
super.onRestart();
}
@Override
protected void onPause() {
super.onPause();
mFlutter1Engine.getLifecycleChannel().appIsInactive();
}
@Override
protected void onStop() {
super.onStop();
mFlutter1Engine.getLifecycleChannel().appIsPaused();
}
@Override
protected void onDestroy() {
super.onDestroy();
FlutterEngineCache.getInstance().remove("flutter1");
mFlutter1Engine.destroy();
mFlutter1Engine = null;
mFlutter1View = null;
mFlutter1MethodChannel1 = null;
}
@Override
public void onBackPressed() {
super.onBackPressed();
finish();
}
}
Flutter2Activity.java代码
package xyz.djytest.flutter_test_native_project;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.FrameLayout;
import androidx.appcompat.app.AppCompatActivity;
import io.flutter.embedding.android.FlutterView;
import io.flutter.embedding.engine.FlutterEngine;
import io.flutter.embedding.engine.FlutterEngineCache;
import io.flutter.embedding.engine.dart.DartExecutor;
import io.flutter.embedding.engine.renderer.FlutterUiDisplayListener;
import io.flutter.plugin.common.MethodCall;
import io.flutter.plugin.common.MethodChannel;
import io.flutter.view.FlutterMain;
public class Flutter2Activity extends AppCompatActivity {
FlutterEngine mFlutter2Engine;
FlutterView mFlutter2View;
MethodChannel mFlutter2MethodChannel;
Button mButton;
@Override
protected void onCreate(Bundle savedInstanceState) {
FlutterMain.startInitialization(this);
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_flutter2);
mButton = findViewById(R.id.button1);
mButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (mFlutter2MethodChannel != null) {
mFlutter2MethodChannel.invokeMethod("getFlutterMethod", null, new MethodChannel.Result() {
@Override
public void success(Object result) {
if (result != null) {
String str = result.toString();
mButton.setText(str);
}
}
@Override
public void error(String errorCode, String errorMessage, Object errorDetails) {
}
@Override
public void notImplemented() {
}
});
}
}
});
initFlutterEngine();
mFlutter2View = createFlutterView();
mFlutter2View.attachToFlutterEngine(mFlutter2Engine);
}
private FlutterView createFlutterView() {
FlutterView flutterView = new FlutterView(this);
FrameLayout.LayoutParams lp = new FrameLayout.LayoutParams(
ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.MATCH_PARENT);
FrameLayout flContainer = findViewById(R.id.fl_flutter);
flContainer.addView(flutterView, lp);
flContainer.setVisibility(View.INVISIBLE);
FlutterUiDisplayListener listener = new FlutterUiDisplayListener() {
@Override
public void onFlutterUiDisplayed() {
flContainer.setVisibility(View.VISIBLE);
}
@Override
public void onFlutterUiNoLongerDisplayed() {
}
};
flutterView.addOnFirstFrameRenderedListener(listener);
return flutterView;
}
private void initFlutterEngine() {
mFlutter2Engine = FlutterEngineCache.getInstance().get("flutter2");
if (mFlutter2Engine == null) {
mFlutter2Engine = new FlutterEngine(this);
mFlutter2Engine.getNavigationChannel().setInitialRoute("route2");
initChannel(mFlutter2Engine);
mFlutter2Engine.getDartExecutor().executeDartEntrypoint(
DartExecutor.DartEntrypoint.createDefault()
);
FlutterEngineCache.getInstance().put("flutter2", mFlutter2Engine);
}
}
private void initChannel(FlutterEngine flutter2Engine) {
mFlutter2MethodChannel = new MethodChannel(flutter2Engine.getDartExecutor(), "flutter2/flutter2Java");
mFlutter2MethodChannel.setMethodCallHandler(new MethodChannel.MethodCallHandler() {
@Override
public void onMethodCall(MethodCall call, MethodChannel.Result result) {
if (call == null || result == null) {
if (result != null) {
result.error("-1", "MethodCall is null", new Exception("MethodCall is null"));
}
return;
}
if ("getJavaMethod".equals(call.method)) {
result.success("success ");
} else {
result.success(" unKnow method");
}
}
});
}
@Override
protected void onResume() {
super.onResume();
mFlutter2Engine.getLifecycleChannel().appIsResumed();
}
@Override
protected void onStart() {
super.onStart();
}
@Override
protected void onRestart() {
super.onRestart();
}
@Override
protected void onPause() {
super.onPause();
mFlutter2Engine.getLifecycleChannel().appIsInactive();
}
@Override
protected void onStop() {
super.onStop();
mFlutter2Engine.getLifecycleChannel().appIsPaused();
}
@Override
protected void onDestroy() {
super.onDestroy();
FlutterEngineCache.getInstance().remove("flutter2");
mFlutter2Engine.destroy();
mFlutter2Engine = null;
mFlutter2View = null;
mFlutter2MethodChannel = null;
}
@Override
public void onBackPressed() {
super.onBackPressed();
finish();
}
}
