React Native 和 Android 的异常

Question

我正在尝试将 React-Native 集成到我现有的 Android 项目中，但我在下面看到了异常。我已按照 here.

中的所有步骤进行操作

经过几个小时的搜索，我在网上找不到任何东西。

这是完整的异常日志：

 java.lang.ClassCastException: com.example.myapplication.ReactActivity cannot be cast to androidx.fragment.app.FragmentActivity
    at com.facebook.react.modules.dialog.DialogModule.getFragmentManagerHelper(DialogModule.java:245)
    at com.facebook.react.modules.dialog.DialogModule.onHostResume(DialogModule.java:177)
    at com.facebook.react.bridge.ReactContext.run(ReactContext.java:174)
    at android.os.Handler.handleCallback(Handler.java:873)
    at android.os.Handler.dispatchMessage(Handler.java:99)
    at com.facebook.react.bridge.queue.MessageQueueThreadHandler.dispatchMessage(MessageQueueThreadHandler.java:29)
    at android.os.Looper.loop(Looper.java:193)
    at android.app.ActivityThread.main(ActivityThread.java:6669)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)

这是截图

我只有一个本机 activity，它有一个按钮可以将我重定向到我的 ReactActivity，这与上面的集成指南中提到的完全相同。感谢您的帮助！

主要活动代码：

import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.provider.Settings;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends Activity {

private static final int OVERLAY_PERMISSION_REQ_CODE = 1212;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
        if (!Settings.canDrawOverlays(this)) {
            Intent intent = new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION,
                    Uri.parse("package:" + getPackageName()));
            startActivityForResult(intent, OVERLAY_PERMISSION_REQ_CODE);
        }
    }

    Button button = findViewById(R.id.button);
    button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            goToReactActivity();
        }
    });
}

private void goToReactActivity() {
    Intent intent = new Intent(this, ReactActivity.class);
    startActivity(intent);
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode == OVERLAY_PERMISSION_REQ_CODE) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            if (!Settings.canDrawOverlays(this)) {
                Toast.makeText(this,
                        "You cannot open the React Native app as you have denied the permission",
                        Toast.LENGTH_SHORT).show();
            }
        }
    }
}
}

ReactActivity 代码：

import android.app.Activity;
import android.os.Bundle;
import android.view.KeyEvent;
import com.facebook.react.ReactInstanceManager;
import com.facebook.react.ReactRootView;
import com.facebook.react.common.LifecycleState;
import com.facebook.react.modules.core.DefaultHardwareBackBtnHandler;
import com.facebook.react.shell.MainReactPackage;
import com.facebook.soloader.SoLoader;

public class ReactActivity extends Activity implements DefaultHardwareBackBtnHandler {
private ReactRootView mReactRootView;
private ReactInstanceManager mReactInstanceManager;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    mReactRootView = new ReactRootView(this);
    SoLoader.init(this, false);
    mReactInstanceManager = ReactInstanceManager.builder()
            .setApplication(getApplication())
            .setCurrentActivity(this)
            .setBundleAssetName("index.android.bundle")
            .setJSMainModulePath("index.android")
            .addPackage(new MainReactPackage())
            .setUseDeveloperSupport(BuildConfig.DEBUG)
            .setInitialLifecycleState(LifecycleState.RESUMED)
            .build();
    // The string here (e.g. "MyReactNativeApp") has to match
    // the string in AppRegistry.registerComponent() in index.js
    mReactRootView.startReactApplication(mReactInstanceManager, "MyApplication", null);

    setContentView(mReactRootView);
}


@Override
public void invokeDefaultOnBackPressed() {
    super.onBackPressed();
}

@Override
protected void onPause() {
    super.onPause();

    if (mReactInstanceManager != null) {
        mReactInstanceManager.onHostPause(this);
    }
}

@Override
protected void onResume() {
    super.onResume();

    if (mReactInstanceManager != null) {
        mReactInstanceManager.onHostResume(this, this);
    }
}

@Override
protected void onDestroy() {
    super.onDestroy();

    if (mReactInstanceManager != null) {
        mReactInstanceManager.onHostDestroy(this);
    }
}

@Override
public void onBackPressed() {
    if (mReactInstanceManager != null) {
        mReactInstanceManager.onBackPressed();
    } else {
        super.onBackPressed();
    }
}

@Override
public boolean onKeyUp(int keyCode, KeyEvent event) {
    if (keyCode == KeyEvent.KEYCODE_MENU && mReactInstanceManager != null) {
        mReactInstanceManager.showDevOptionsDialog();
        return true;
    }
    return super.onKeyUp(keyCode, event);
}

}

Android清单：

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:tools="http://schemas.android.com/tools"
      package="com.example.myapplication">

<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACTION_MANAGE_OVERLAY_PERMISSION" />
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />

<application android:allowBackup="true"
             android:label="@string/app_name"
             android:icon="@mipmap/ic_launcher"
             android:roundIcon="@mipmap/ic_launcher_round"
             android:usesCleartextTraffic="true"
             android:supportsRtl="true"
             android:appComponentFactory="androidx"
             tools:replace="android:appComponentFactory"
             android:theme="@style/AppTheme">

    <activity android:name="com.facebook.react.devsupport.DevSettingsActivity"/>
    <activity android:name=".MainActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity
            android:name=".ReactActivity"
            android:label="@string/app_name"
            android:theme="@style/Theme.AppCompat.Light.NoActionBar">
    </activity>
</application>

Answer 1

那就是您现有的库可能依赖于 androidX 或无法编译。

您能否在不使用 androidX 库的情况下添加之前的代码，因为该库可能仍未升级为使用 androidX

import android.support.v4.app.Fragment; //试试这个

Answer 2

尝试....用 AppCompatActivity 扩展 class ReactActivity 并导入它的包
androidx.appcompat.app.AppCompatActivity;

Answer 3

首先创建一个ReactContext实例，然后通过传入RC实例的TaskID创建一个AppCompatActivity对象

ReactContext reactContext = (ReactContext)getContext();

AppCompatActivity currentActivity = new AppCompatActivity(reactContext.getCurrentActivity().getTaskId());

React Native 和 Android 的异常

Exceptions with ReactNative and AndroidX

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react-native

androidx