在Java Fragment中集成并显示Jetpack Compose对话框

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".YourFragment">

    <!-- 其他传统视图组件 -->

    <androidx.compose.ui.platform.ComposeView
        android:id="@+id/yourComposeView"
        android:layout_width="0dp"
        android:layout_height="0dp"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintBottom_toBottomOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.compose.material3.AlertDialog;
import androidx.compose.material3.Text;
import androidx.compose.material3.TextButton;
import androidx.compose.runtime.MutableState;
import androidx.compose.runtime.collectAsState;
import androidx.compose.runtime.getValue;
import androidx.compose.runtime.mutableStateOf;
import androidx.compose.ui.platform.ComposeView;
import androidx.fragment.app.Fragment;
import androidx.lifecycle.ViewModelProvider;

import kotlinx.coroutines.flow.MutableStateFlow; // 引入Kotlin的MutableStateFlow

public class MyJavaFragment extends Fragment {

    // 使用MutableStateFlow来管理对话框的显示状态
    // 在实际项目中，这通常会放在ViewModel中
    private final MutableStateFlow<Boolean> showComposeDialog = new MutableStateFlow<>(false);

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_my_java, container, false);

        ComposeView composeView = view.findViewById(R.id.yourComposeView);
        composeView.setContent(() -> {
            // 在Compose可组合函数中观察状态
            // collectAsState() 是一个Kotlin扩展函数，需要Compose的Kotlin集成
            // 如果是纯Java项目，可能需要通过其他方式（如DisposableEffect结合Java的Listener）来观察StateFlow
            // 为了简化，这里假设可以访问Kotlin的collectAsState
            final boolean showDialog by showComposeDialog.collectAsState(false); // 初始值

            if (showDialog) {
                AlertDialog(
                    () -> {
                        // 当对话框请求关闭时
                        showComposeDialog.setValue(false);
                    },
                    () -> {
                        // 对话框标题
                        return new Text("Compose Dialog Title");
                    },
                    () -> {
                        // 对话框内容
                        return new Text("This is a Jetpack Compose dialog displayed from a Java Fragment.");
                    },
                    null, // confirmButton
                    () -> {
                        // dismissButton
                        return new TextButton(
                            () -> {
                                showComposeDialog.setValue(false); // 点击关闭按钮
                            },
                            () -> {
                                return new Text("Dismiss");
                            }
                        );
                    }
                );
            }
        });

        // 示例：在某个事件触发时显示对话框
        // 例如，一个按钮点击事件
        view.findViewById(R.id.show_dialog_button).setOnClickListener(v -> {
            showComposeDialog.setValue(true); // 设置状态为true，显示对话框
        });

        return view;
    }
}