如何在 Android 上显示警报对话框？
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How do I display an alert dialog on Android?
提问by UMAR
I want to display a dialog/popup window with a message to the user that shows "Are you sure you want to delete this entry?" with one button that says 'Delete'. When Deleteis touched, it should delete that entry, otherwise nothing.
我想显示一个对话框/弹出窗口，向用户显示一条消息，显示“您确定要删除此条目吗？” 一个按钮，上面写着“删除”。当Delete被触摸时，它应该删除该条目，否则什么都没有。
I have written a click listener for those buttons, but how do I invoke a dialog or popup and its functionality?
我已经为这些按钮编写了一个单击侦听器，但是如何调用对话框或弹出窗口及其功能？
回答by dxh
You could use an AlertDialogfor this and construct one using its Builderclass. The example below uses the default constructor that only takes in a Contextsince the dialog will inherit the proper theme from the Context you pass in, but there's also a constructor that allows you to specify a specific theme resource as the second parameter if you desire to do so.
您可以AlertDialog为此使用 an并使用其Builder类构造一个。下面的示例使用默认构造函数，该构造函数只接受 a，Context因为对话框将从您传入的 Context 继承正确的主题，但还有一个构造函数允许您将特定的主题资源指定为第二个参数（如果您愿意的话）所以。
new AlertDialog.Builder(context)
.setTitle("Delete entry")
.setMessage("Are you sure you want to delete this entry?")
// Specifying a listener allows you to take an action before dismissing the dialog.
// The dialog is automatically dismissed when a dialog button is clicked.
.setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// Continue with delete operation
}
})
// A null listener allows the button to dismiss the dialog and take no further action.
.setNegativeButton(android.R.string.no, null)
.setIcon(android.R.drawable.ic_dialog_alert)
.show();
回答by Mahesh
Try this code:
试试这个代码：
AlertDialog.Builder builder1 = new AlertDialog.Builder(context);
builder1.setMessage("Write your message here.");
builder1.setCancelable(true);
builder1.setPositiveButton(
"Yes",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
}
});
builder1.setNegativeButton(
"No",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
}
});
AlertDialog alert11 = builder1.create();
alert11.show();
回答by sanath_p
The code which David Hedlund has posted gave me the error:
David Hedlund 发布的代码给了我错误：
Unable to add window — token null is not valid
无法添加窗口 — 令牌空无效
If you are getting the same error use the below code. It works!!
如果您遇到相同的错误，请使用以下代码。有用！！
runOnUiThread(new Runnable() {
@Override
public void run() {
if (!isFinishing()){
new AlertDialog.Builder(YourActivity.this)
.setTitle("Your Alert")
.setMessage("Your Message")
.setCancelable(false)
.setPositiveButton("ok", new OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// Whatever...
}
}).show();
}
}
});
回答by Madan Sapkota
Just a simple one! Create a dialog method, something like this anywhere in your Java class:
只是一个简单的！在 Java 类中的任何位置创建一个对话框方法，如下所示：
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();
}
Now create Layout XML dialog_demo.xmland create your UI/design. Here is a sample one I created for demo purposes:
现在创建布局 XMLdialog_demo.xml并创建您的 UI/设计。这是我为演示目的创建的示例：
<?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>
Now you can call openDialog()from anywhere you like :) Here is the screenshot of above code.
现在你可以openDialog()从你喜欢的任何地方调用:) 这是上面代码的屏幕截图。
Note that text and color are used from strings.xmland colors.xml. You can define your own.
请注意，文本和颜色是从strings.xml和 使用的colors.xml。你可以定义你自己的。
回答by Richard Kamere
Use AlertDialog.Builder:
使用AlertDialog.Builder：
AlertDialog alertDialog = new AlertDialog.Builder(this)
//set icon
.setIcon(android.R.drawable.ic_dialog_alert)
//set title
.setTitle("Are you sure to Exit")
//set message
.setMessage("Exiting will call finish() method")
//set positive button
.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
//set what would happen when positive button is clicked
finish();
}
})
//set negative button
.setNegativeButton("No", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
//set what should happen when negative button is clicked
Toast.makeText(getApplicationContext(),"Nothing Happened",Toast.LENGTH_LONG).show();
}
})
.show();
You will get the following output.
您将获得以下输出。
To view alert dialog tutorial use the link below.
要查看警报对话框教程，请使用下面的链接。
回答by goRGon
Nowadays it's better to use DialogFragment instead of direct AlertDialog creation.
现在最好使用 DialogFragment 而不是直接创建 AlertDialog。
回答by romain guy
You can use this code:
您可以使用此代码：
AlertDialog.Builder alertDialog2 = new AlertDialog.Builder(
AlertDialogActivity.this);
// Setting Dialog Title
alertDialog2.setTitle("Confirm Delete...");
// Setting Dialog Message
alertDialog2.setMessage("Are you sure you want delete this file?");
// Setting Icon to Dialog
alertDialog2.setIcon(R.drawable.delete);
// Setting Positive "Yes" Btn
alertDialog2.setPositiveButton("YES",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// Write your code here to execute after dialog
Toast.makeText(getApplicationContext(),
"You clicked on YES", Toast.LENGTH_SHORT)
.show();
}
});
// Setting Negative "NO" Btn
alertDialog2.setNegativeButton("NO",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// Write your code here to execute after dialog
Toast.makeText(getApplicationContext(),
"You clicked on NO", Toast.LENGTH_SHORT)
.show();
dialog.cancel();
}
});
// Showing Alert Dialog
alertDialog2.show();
回答by Hoàng ??ng
for me
为了我
new AlertDialog.Builder(this)
.setTitle("Closing application")
.setMessage("Are you sure you want to exit?")
.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
}
}).setNegativeButton("No", null).show();
回答by Anil Singhania
// Dialog box
public void dialogBox() {
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(this);
alertDialogBuilder.setMessage("Click on Image for tag");
alertDialogBuilder.setPositiveButton("Ok",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface arg0, int arg1) {
}
});
alertDialogBuilder.setNegativeButton("cancel",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface arg0, int arg1) {
}
});
AlertDialog alertDialog = alertDialogBuilder.create();
alertDialog.show();
}
回答by user3219477
new AlertDialog.Builder(context)
.setTitle("title")
.setMessage("message")
.setPositiveButton(android.R.string.ok, null)
.show();
