获取活动上下文，以便使用组合上下文从不可组合函数打开警报对话框

Question

我有另一个 API 库，里面发生了一些事情，如果发生某种情况，我想显示一个对话框，并选择如果接受/拒绝，要对它们执行什么操作， 当对话框需要显示它崩溃时， 顺便说一句，有什么方法可以从撰写中获取活动上下文，以便允许它在我与唯一的单个活动应用程序一起使用的任何其他撰写功能中显示警报对话框？ 我也尝试过 AlertDialog.Builder(context) 并得到相同的结果，

我的最小示例：

@Composable
fun Check(){
    val context = LocalContext.current
    Button(onClick= {
        TestObject.alert(context)
    }){
        Text("Test")
    }
}

object TestObject{

... //things happend there
    fun alert(context: Context){
        ... //things happend there
        MaterialAlertDialogBuilder(context)
            .setTitle("Hi")
            .setMessage("Hello World")
            .setNeutralButton("OK", null)
            .show()
    }
}

更新：错误堆栈：

dRuntime: FATAL EXCEPTION: main
    Process: com.rayan.alertdialogproblem, PID: 4980
    java.lang.IllegalArgumentException: The style on this component requires your app theme to be Theme.AppCompat (or a descendant).
        at com.google.android.material.internal.ThemeEnforcement.checkTheme(ThemeEnforcement.java:241)
        at com.google.android.material.internal.ThemeEnforcement.checkAppCompatTheme(ThemeEnforcement.java:211)
        at com.google.android.material.internal.ThemeEnforcement.checkCompatibleTheme(ThemeEnforcement.java:146)
        at com.google.android.material.internal.ThemeEnforcement.obtainStyledAttributes(ThemeEnforcement.java:75)
        at com.google.android.material.dialog.MaterialDialogs.getDialogBackgroundInsets(MaterialDialogs.java:60)
        at com.google.android.material.dialog.MaterialAlertDialogBuilder.<init>(MaterialAlertDialogBuilder.java:117)
        at com.google.android.material.dialog.MaterialAlertDialogBuilder.<init>(MaterialAlertDialogBuilder.java:103)
        at com.rayan.alertdialogproblem.TestObject.alert(MainActivity.kt:58)
        at com.rayan.alertdialogproblem.MainActivityKt$Check$1.invoke(MainActivity.kt:43)
        at com.rayan.alertdialogproblem.MainActivityKt$Check$1.invoke(MainActivity.kt:42)
        at androidx.compose.foundation.ClickableKt$clickable$4$gesture$1$2.invoke-k-4lQ0M(Clickable.kt:137)
        at androidx.compose.foundation.ClickableKt$clickable$4$gesture$1$2.invoke(Clickable.kt:137)
        at androidx.compose.foundation.gestures.TapGestureDetectorKt$detectTapAndPress$2$1$1.invokeSuspend(TapGestureDetector.kt:378)
        at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
        at kotlinx.coroutines.DispatchedTaskKt.resume(DispatchedTask.kt:178)
        at kotlinx.coroutines.DispatchedTaskKt.dispatch(DispatchedTask.kt:166)
        at kotlinx.coroutines.CancellableContinuationImpl.dispatchResume(CancellableContinuationImpl.kt:398)
        at kotlinx.coroutines.CancellableContinuationImpl.resumeImpl(CancellableContinuationImpl.kt:432)
        at kotlinx.coroutines.CancellableContinuationImpl.resumeImpl$default(CancellableContinuationImpl.kt:421)
        at kotlinx.coroutines.CancellableContinuationImpl.resumeWith(CancellableContinuationImpl.kt:329)
        at androidx.compose.ui.input.pointer.SuspendingPointerInputFilter$PointerEventHandlerCoroutine.offerPointerEvent(SuspendingPointerInputFilter.kt:432)
        at androidx.compose.ui.input.pointer.SuspendingPointerInputFilter.dispatchPointerEvent(SuspendingPointerInputFilter.kt:330)
        at androidx.compose.ui.input.pointer.SuspendingPointerInputFilter.onPointerEvent-H0pRuoY(SuspendingPointerInputFilter.kt:343)
        at androidx.compose.ui.input.pointer.Node.dispatchMainEventPass(HitPathTracker.kt:287)
        at androidx.compose.ui.input.pointer.Node.dispatchMainEventPass(HitPathTracker.kt:275)
        at androidx.compose.ui.input.pointer.NodeParent.dispatchMainEventPass(HitPathTracker.kt:151)
        at androidx.compose.ui.input.pointer.HitPathTracker.dispatchChanges(HitPathTracker.kt:90)
        at androidx.compose.ui.input.pointer.PointerInputEventProcessor.process-gBdvCQM(PointerInputEventProcessor.kt:77)
        at androidx.compose.ui.platform.AndroidComposeView.dispatchTouchEvent(AndroidComposeView.android.kt:860)
        at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3120)
        at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2801)
        at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3120)
        at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2801)
        at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3120)
        at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2801)
        at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3120)
        at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2801)
        at com.android.internal.policy.DecorView.superDispatchTouchEvent(DecorView.java:502)
        at com.android.internal.policy.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1890)
        at android.app.Activity.dispatchTouchEvent(Activity.java:4196)
E/AndroidRuntime:     at com.android.internal.policy.DecorView.dispatchTouchEvent(DecorView.java:460)
        at android.view.View.dispatchPointerEvent(View.java:14799)
        at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:6347)
        at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:6148)
        at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:5626)
        at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:5683)
        at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:5649)
        at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:5814)
        at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:5657)
        at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:5871)
        at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:5630)
        at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:5683)
        at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:5649)
        at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:5657)
        at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:5630)
        at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:8562)
        at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:8513)
        at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:8482)
        at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:8685)
        at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:259)
        at android.os.MessageQueue.nativePollOnce(Native Method)
        at android.os.MessageQueue.next(MessageQueue.java:335)
        at android.os.Looper.loopOnce(Looper.java:161)
        at android.os.Looper.loop(Looper.java:288)
        at android.app.ActivityThread.main(ActivityThread.java:7839)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1003)

Answer 1

该错误表明该对话框需要主题。您可以为其提供ContextThemeWrapper，可以是在res/values/themes中声明的自定义一个，也可以是默认的，例如R.style.Theme_MaterialComponents_Dialog >：

MaterialAlertDialogBuilder(ContextThemeWrapper(context, R.style.Theme_MaterialComponents_Dialog))

有关自定义主题的更多信息可以在此处找到

Answer 2

您应该使用可组合的 AlertDialog
https://developer.android.com/reference/ kotlin/androidx/compose/material3/package-summary#alertdialog

@Composable
fun Check(){
    val showDialog by remember { mutableStateOf(false) }
    
    if(showDialog) {
        AlertDialog(
             onDismissRequest = {
                    showDialog = false
             },
        )
    }

    Button(onClick= {
        showDialog = true
    }){
        Text("Test")
    }
}

可用的属性：

• title ：将显示在对话框顶部的可组合项
• text ：将显示的可组合项位于对话框中心的
• 按钮：将显示在对话框底部的可组合项

如果您想了解每个属性，请检查上面的链接或使用 android studio 检查属性。

Answer 3

这是主题错误...您需要在 AndroidManifest.xml 文件中设置 MainActivity.kt 的主题。并且，该主题（在 styles.xml 中）必须有一个名为“Theme.AppCompat”的父主题