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
这是在kotlin中完成的
val builder: AlertDialog.Builder = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
AlertDialog.Builder(this, android.R.style.Theme_Material_Dialog_Alert)
} else {
AlertDialog.Builder(this)
}
builder.setTitle("Delete Alert!")
.setMessage("Are you want to delete this entry?")
.setPositiveButton("YES") { dialog, which ->
}
.setNegativeButton("NO") { dialog, which ->
}
.setIcon(R.drawable.ic_launcher_foreground)
.show()
其他回答
这是在kotlin中完成的
val builder: AlertDialog.Builder = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
AlertDialog.Builder(this, android.R.style.Theme_Material_Dialog_Alert)
} else {
AlertDialog.Builder(this)
}
builder.setTitle("Delete Alert!")
.setMessage("Are you want to delete this entry?")
.setPositiveButton("YES") { dialog, which ->
}
.setNegativeButton("NO") { dialog, which ->
}
.setIcon(R.drawable.ic_launcher_foreground)
.show()
你也可以尝试这种方式，它将为你提供材料样式的对话框
private void showDialog()
{
String text2 = "<font color=#212121>Medi Notification</font>";//for custom title color
AlertDialog.Builder builder = new AlertDialog.Builder(this, R.style.AppCompatAlertDialogStyle);
builder.setTitle(Html.fromHtml(text2));
String text3 = "<font color=#A4A4A4>You can complete your profile now or start using the app and come back later</font>";//for custom message
builder.setMessage(Html.fromHtml(text3));
builder.setPositiveButton("DELETE", new DialogInterface.OnClickListener()
{
@Override
public void onClick(DialogInterface dialog, int which)
{
toast = Toast.makeText(getApplicationContext(), "DELETE", Toast.LENGTH_SHORT);
toast.setGravity(Gravity.CENTER, 0, 0);
toast.show();
}
});
builder.setNegativeButton("CANCEL", new DialogInterface.OnClickListener()
{
@Override
public void onClick(DialogInterface dialog, int which)
{
toast = Toast.makeText(getApplicationContext(), "CANCEL", Toast.LENGTH_SHORT);
toast.setGravity(Gravity.CENTER, 0, 0);
toast.show();
}
});
builder.show();
}
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();
}
我在onClick方法中使用这个AlertDialog:
button.setOnClickListener(v -> {
AlertDialog.Builder builder = new AlertDialog.Builder(this);
LayoutInflater layoutInflaterAndroid = LayoutInflater.from(this);
View view = layoutInflaterAndroid.inflate(R.layout.cancel_dialog, null);
builder.setView(view);
builder.setCancelable(false);
final AlertDialog alertDialog = builder.create();
alertDialog.show();
view.findViewById(R.id.yesButton).setOnClickListener(v -> onBackPressed());
view.findViewById(R.id.nobutton).setOnClickListener(v -> alertDialog.dismiss());
});
dialog.xml
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:id="@+id/textmain"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:gravity="center"
android:padding="5dp"
android:text="@string/warning"
android:textColor="@android:color/black"
android:textSize="18sp"
android:textStyle="bold"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="@+id/textpart2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:gravity="center"
android:lines="2"
android:maxLines="2"
android:padding="5dp"
android:singleLine="false"
android:text="@string/dialog_cancel"
android:textAlignment="center"
android:textColor="@android:color/black"
android:textSize="15sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/textmain" />
<TextView
android:id="@+id/yesButton"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginStart="40dp"
android:layout_marginTop="5dp"
android:layout_marginEnd="40dp"
android:layout_marginBottom="5dp"
android:background="#87cefa"
android:gravity="center"
android:padding="10dp"
android:text="@string/yes"
android:textAlignment="center"
android:textColor="@android:color/black"
android:textSize="15sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/textpart2" />
<TextView
android:id="@+id/nobutton"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginStart="40dp"
android:layout_marginTop="5dp"
android:layout_marginEnd="40dp"
android:background="#87cefa"
android:gravity="center"
android:padding="10dp"
android:text="@string/no"
android:textAlignment="center"
android:textColor="@android:color/black"
android:textSize="15sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/yesButton" />
<TextView
android:layout_width="match_parent"
android:layout_height="20dp"
android:layout_margin="5dp"
android:padding="10dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/nobutton" />
</androidx.constraintlayout.widget.ConstraintLayout>
在过去的几天里，我的同事一直在问我如何在Xamarin中使用AlertDialog。Android和几乎所有人都把这个问题作为参考发给了我，他们在问我之前读了这个问题(没有找到答案)，所以这里是Xamarin。Android (c#)版本:
var alertDialog = new AlertDialog.Builder(this) // this: Activity
.SetTitle("Hello!")
.SetMessage("Are you sure?")
.SetPositiveButton("Ok", (sender, e) => { /* ok things */ })
.SetNegativeButton("Cancel", (sender, e) => { /* cancel things */ })
.Create();
alertDialog.Show();
// you can customize your AlertDialog, like so
var tvMessage = alertDialog.FindViewById<TextView>(Android.Resource.Id.Message);
tvMessage.TextSize = 13;
// ...
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