我想显示一个对话框/弹出窗口,向用户显示一条消息“您确定要删除此条目吗?”,其中一个按钮说“删除”。当点击Delete时,它应该删除该条目,否则什么都不删除。
我已经为这些按钮写了一个点击监听器,但我如何调用对话框或弹出窗口及其功能?
我想显示一个对话框/弹出窗口,向用户显示一条消息“您确定要删除此条目吗?”,其中一个按钮说“删除”。当点击Delete时,它应该删除该条目,否则什么都不删除。
我已经为这些按钮写了一个点击监听器,但我如何调用对话框或弹出窗口及其功能?
当前回答
这是一个创建Alert对话框的基本示例:
AlertDialog.Builder dialog = new AlertDialog.Builder(MainActivity.this);
dialog.setCancelable(false);
dialog.setTitle("Dialog on Android");
dialog.setMessage("Are you sure you want to delete this entry?" );
dialog.setPositiveButton("Delete", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int id) {
//Action for "Delete".
}
})
.setNegativeButton("Cancel ", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
//Action for "Cancel".
}
});
final AlertDialog alert = dialog.create();
alert.show();
其他回答
只是简单的一个!在你的Java类中创建一个dialog方法,就像这样:
public void openDialog() {
final Dialog dialog = new Dialog(context); // Context, this, etc.
dialog.setContentView(R.layout.dialog_demo);
dialog.setTitle(R.string.dialog_title);
dialog.show();
}
现在创建布局XML dialog_demo.xml并创建UI/设计。下面是我为演示目的创建的一个示例:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="@+id/dialog_info"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="10dp"
android:text="@string/dialog_text"/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="40dp"
android:layout_below="@id/dialog_info">
<Button
android:id="@+id/dialog_cancel"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="0.50"
android:background="@color/dialog_cancel_bgcolor"
android:text="Cancel"/>
<Button
android:id="@+id/dialog_ok"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="0.50"
android:background="@color/dialog_ok_bgcolor"
android:text="Agree"/>
</LinearLayout>
</RelativeLayout>
现在你可以从任何你喜欢的地方调用openDialog():)下面是上面代码的截图。
注意,文本和颜色来自strings.xml和colors.xml。你可以定义你自己的。
从列表中删除条目的代码
/*--dialog for delete entry--*/
private void cancelBookingAlert() {
AlertDialog dialog;
final AlertDialog.Builder alertDialog = new AlertDialog.Builder(MainActivity.this, R.style.AlertDialogCustom);
alertDialog.setTitle("Delete Entry");
alertDialog.setMessage("Are you sure you want to delete this entry?");
alertDialog.setCancelable(false);
alertDialog.setPositiveButton("Delete", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
//code to delete entry
}
});
alertDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
dialog = alertDialog.create();
dialog.show();
}
在删除按钮单击时调用上述方法
Kotlin定制对话框: 如果你想创建自定义对话框
Dialog(activity!!, R.style.LoadingIndicatorDialogStyle)
.apply {
// requestWindowFeature(Window.FEATURE_NO_TITLE)
setCancelable(true)
setContentView(R.layout.define_your_custom_view_id_here)
//access your custom view buttons/editText like below.z
val createBt = findViewById<TextView>(R.id.clipboard_create_project)
val cancelBt = findViewById<TextView>(R.id.clipboard_cancel_project)
val clipboard_et = findViewById<TextView>(R.id.clipboard_et)
val manualOption =
findViewById<TextView>(R.id.clipboard_manual_add_project_option)
//if you want to perform any operation on the button do like this
createBt.setOnClickListener {
//handle your button click here
val enteredData = clipboard_et.text.toString()
if (enteredData.isEmpty()) {
Utils.toast("Enter project details")
} else {
navigateToAddProject(enteredData, true)
dismiss()
}
}
cancelBt.setOnClickListener {
dismiss()
}
manualOption.setOnClickListener {
navigateToAddProject("", false)
dismiss()
}
show()
}
在style.xml中创建LoadingIndicatorDialogStyle
<style name="LoadingIndicatorDialogStyle" parent="Theme.AppCompat.Light.Dialog.Alert">
<item name="android:windowIsTranslucent">true</item>
<item name="android:windowBackground">@android:color/transparent</item>
<item name="android:windowContentOverlay">@null</item>
<item name="android:windowNoTitle">true</item>
<item name="android:statusBarColor">@color/black_transperant</item>
<item name="android:layout_gravity">center</item>
<item name="android:background">@android:color/transparent</item>
<!--<item name="android:windowAnimationStyle">@style/MaterialDialogSheetAnimation</item>-->
现在与Jetpack撰写引入android,你可以简单地创建警报对话框使用下面的代码
if (viewModel.shouldDialogOpen.value) {
AlertDialog(onDismissRequest = { viewModel.shouldDialogOpen.value = false },
title = { Text("Delete Entry?") },
text = {
Text("Are you sure you want to delete this entry?")
},
dismissButton = {
Button(modifier = Modifier.fillMaxWidth(), onClick = {
viewModel.shouldDialogOpen.value = false
}) {
Text(text = "Cancel")
}
}, confirmButton = {
Button(modifier = Modifier.fillMaxWidth(), onClick = {
viewModel.shouldDialogOpen.value = false
viewModel.beginDelete(recipe)
}) {
Text(text = "Okay")
}
})
}
在viewModel中。shouldDialogOpen, shouldDialogOpen是viewmodel中的一个mutablestate字段,当我们需要显示或解散对话框时,我们会改变它的值。
更多的代码样本Jetpack撰写:- https://androidlearnersite.wordpress.com/2021/08/03/jetpack-compose-1-0-0-sample-codes/
创建这个静态方法,并在任何需要的地方使用它。
public static void showAlertDialog(Context context, String title, String message, String posBtnMsg, String negBtnMsg) {
AlertDialog.Builder builder = new AlertDialog.Builder(context);
builder.setTitle(title);
builder.setMessage(message);
builder.setPositiveButton(posBtnMsg, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
builder.setNegativeButton(negBtnMsg, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
AlertDialog dialog = builder.create();
dialog.show();
}