Android - How do i make this alert dialog scrollable?

问题

I am beginner in android and making my first android app. my 'About' menu item, when clicked shows an alertdialog with a really long message. I have been trying different methods to make it scrollable but i couldn't. I have tried reading different questions on stackoverflow but they didn't worked for me. Here is my alert dialog code.

AlertDialog.Builder alertDialog = new AlertDialog.Builder(this);  
alertDialog.setTitle("Title");  
alertDialog.setMessage("Here is a really long message.");  
 alertDialog.setButton("OK", null);  
 AlertDialog alert = alertDialog.create();
alert.show();

Can anybody explain me in detail that how to make it scrollable? Any help or suggestions would be appreciated !

回答1:

This solution is take from this post.

In order for a view to scrollable, it must be nested inside of a ScrollView container:

<ScrollView>
    <LinearLayout android:orientation="vertical"
            android:scrollbars="vertical"
            android:scrollbarAlwaysDrawVerticalTrack="true">
        <TextView />
        <Button />
    </LinearLayout>
</ScrollView>

Note that a ScrollView container can only have one child layout view. It is not possible, for example, to place a TextView and Button in a ScrollView without the LinearLayout.

回答2:

In that situation you can create your own layout.xml file containing a Text View under Scroll View. and set TextMessage in this Text View, Inflate this layout with your alert dialog box.

yourxmlfile.xml

<ScrollView 
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

    <LinearLayout 
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" >

    <TextView
        android:id="@+id/textmsg"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:text="@string/hello" />

    </LinearLayout>
</ScrollView>

In Activity Class

LayoutInflater inflater= LayoutInflater.from(this);
View view=inflater.inflate(R.layout.yourxmlfile, null);

TextView textview=(TextView)view.findViewById(R.id.textmsg);
textview.setText("Your really long message.");
AlertDialog.Builder alertDialog = new AlertDialog.Builder(this);  
alertDialog.setTitle("Title");  
//alertDialog.setMessage("Here is a really long message.");
alertDialog.setView(view);
alertDialog.setButton("OK", null);  
AlertDialog alert = alertDialog.create();
alert.show();

回答3:

You can just use a default approach:

  AlertDialog.Builder builder = new AlertDialog.Builder(this);
  builder.setTitle("Title")
      .setMessage(message);

  AlertDialog alert = builder.create();

  alert.show();

You can notice that a message TextView is built-in ScrollView container in alert_dialog.xml. It is a layout that is used.

The location of this file is post

来源：https://stackoverflow.com/questions/16955053/android-how-do-i-make-this-alert-dialog-scrollable

标签

android

android-alertdialog