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
带有编辑文本的警报对话框
AlertDialog.Builder builder = new AlertDialog.Builder(context);//Context is activity context
final EditText input = new EditText(context);
builder.setTitle(getString(R.string.remove_item_dialog_title));
builder.setMessage(getString(R.string.dialog_message_remove_item));
builder.setTitle(getString(R.string.update_qty));
builder.setMessage("");
LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.MATCH_PARENT,
LinearLayout.LayoutParams.MATCH_PARENT);
input.setLayoutParams(lp);
input.setHint(getString(R.string.enter_qty));
input.setTextColor(ContextCompat.getColor(context, R.color.textColor));
input.setInputType(InputType.TYPE_CLASS_NUMBER);
input.setText("String in edit text you want");
builder.setView(input);
builder.setPositiveButton(getString(android.R.string.ok),
(dialog, which) -> {
//Positive button click event
});
builder.setNegativeButton(getString(android.R.string.cancel),
(dialog, which) -> {
//Negative button click event
});
AlertDialog dialog = builder.create();
dialog.show();
其他回答
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("This is Title");
builder.setMessage("This is message for Alert Dialog");
builder.setPositiveButton("Positive Button", (dialog, which) -> onBackPressed());
builder.setNegativeButton("Negative Button", (dialog, which) -> dialog.cancel());
builder.show();
这是一种类似于用一行代码创建Alert对话框的方法。
你可以试试这个....
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();
欲了解更多信息，请查看此链接…
我想补充David Hedlund的回答，分享一个比他发布的更有活力的方法，这样当你有消极行为要做的时候，你可以使用它，当你没有的时候，我希望它能有所帮助。
private void showAlertDialog(@NonNull Context context, @NonNull String alertDialogTitle, @NonNull String alertDialogMessage, @NonNull String positiveButtonText, @Nullable String negativeButtonText, @NonNull final int positiveAction, @Nullable final Integer negativeAction, @NonNull boolean hasNegativeAction)
{
AlertDialog.Builder builder;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
builder = new AlertDialog.Builder(context, android.R.style.Theme_Material_Dialog_Alert);
} else {
builder = new AlertDialog.Builder(context);
}
builder.setTitle(alertDialogTitle)
.setMessage(alertDialogMessage)
.setPositiveButton(positiveButtonText, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
switch (positiveAction)
{
case 1:
//TODO:Do your positive action here
break;
}
}
});
if(hasNegativeAction || negativeAction!=null || negativeButtonText!=null)
{
builder.setNegativeButton(negativeButtonText, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
switch (negativeAction)
{
case 1:
//TODO:Do your negative action here
break;
//TODO: add cases when needed
}
}
});
}
builder.setIcon(android.R.drawable.ic_dialog_alert);
builder.show();
}
// 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();
}
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>
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