Make "Want to start battery saver?" dialog better.

- Don't line-break in "Battery" (only in English)
- Add "Learn more" link.

Bug: 78261259

Test: Manual test with:
- adb shell dumpsys battery unplug
- adb shell settings delete secure low_power_warning_acknowledged
- Enable battery saver
- Make sure the link is clickable if a link is set.
- Make sure there's no "learn more" link if the link is not set in strings.xml

Cherry picked I83364f628dd596a4d50bf2aca4db7cbfe7cf4909 and manually resolved conflict.

Change-Id: Icf6d4e62d8cb3556561f992afc45aaea868bce0e

core/java/android/app/AlertDialog.java

@@ -16,8 +16,6 @@
 
 package android.app;
 
-import com.android.internal.app.AlertController;
-
 import android.annotation.ArrayRes;
 import android.annotation.AttrRes;
 import android.annotation.DrawableRes;
@@ -30,17 +28,19 @@ import android.database.Cursor;
 import android.graphics.drawable.Drawable;
 import android.os.Bundle;
 import android.os.Message;
+import android.text.Layout;
+import android.text.method.MovementMethod;
 import android.util.TypedValue;
 import android.view.ContextThemeWrapper;
 import android.view.KeyEvent;
 import android.view.View;
-import android.view.WindowManager;
 import android.widget.AdapterView;
 import android.widget.Button;
 import android.widget.ListAdapter;
 import android.widget.ListView;
 
 import com.android.internal.R;
+import com.android.internal.app.AlertController;
 
 /**
  * A subclass of Dialog that can display one, two or three buttons. If you only want to
@@ -54,7 +54,7 @@ import com.android.internal.R;
  * </pre>
  *
  * <p>The AlertDialog class takes care of automatically setting
- * {@link WindowManager.LayoutParams#FLAG_ALT_FOCUSABLE_IM
+ * {@link android.view.WindowManager.LayoutParams#FLAG_ALT_FOCUSABLE_IM
  * WindowManager.LayoutParams.FLAG_ALT_FOCUSABLE_IM} for you based on whether
  * any views in the dialog return true from {@link View#onCheckIsTextEditor()
  * View.onCheckIsTextEditor()}.  Generally you want this set for a Dialog
@@ -266,6 +266,17 @@ public class AlertDialog extends Dialog implements DialogInterface {
         mAlert.setMessage(message);
     }
 
+    /** @hide */
+    public void setMessageMovementMethod(MovementMethod movementMethod) {
+        mAlert.setMessageMovementMethod(movementMethod);
+    }
+
+    /** @hide */
+    public void setMessageHyphenationFrequency(
+            @Layout.HyphenationFrequency int hyphenationFrequency) {
+        mAlert.setMessageHyphenationFrequency(hyphenationFrequency);
+    }
+
     /**
      * Set the view to display in that dialog.
      */