将垂直滚动条添加到Android中的AlertDialog？

Question

我想在AlertDialog中添加一个垂直滚动条,因为我的文字太长而无法在1个屏幕上显示:

我试过用:

android:scrollbars="vertical" 
android:scrollbarAlwaysDrawVerticalTrack="true"

但滚动条甚至不显示？

这是我正在使用的xml布局文件:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:scrollbars="vertical"
    android:scrollbarAlwaysDrawVerticalTrack="true"
    android:id="@+id/instructions_view" >
    <TextView
        android:id="@+id/TextView01"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="A LONG TEXT 1"/>

    <TextView 
        android:id="@+id/TextView02"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="A LONG TEXT 2"/>

</LinearLayout>

我用以下方法调用AlertsDialog:

public void onClick(View v) {
  switch(v.getId()){

    case R.id.Button_Instructions: 
     InstructionsDialog();
    break;

    case R.id.Button_Exit: 
     ExitDialog();
    break;
    }
 }

public void InstructionsDialog(){

  AlertDialog.Builder ad = new AlertDialog.Builder(this);
  ad.setIcon(R.drawable.icon);
  ad.setTitle("Instructions ...");
  ad.setView(LayoutInflater.from(this).inflate(R.layout.instructions_dialog,null));

  ad.setPositiveButton("OK", 
    new android.content.DialogInterface.OnClickListener() {
     public void onClick(DialogInterface dialog, int arg1) {
      // OK, go back to Main menu
     }
    }
   );

   ad.setOnCancelListener(new DialogInterface.OnCancelListener(){
    public void onCancel(DialogInterface dialog) {
     // OK, go back to Main menu   
    }}
   );

  ad.show();
 }

我现在找到了答案=>现在用它来做:

<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/ScrollView01"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">

    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:orientation="vertical"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:scrollbars="vertical"
        android:scrollbarAlwaysDrawVerticalTrack="true"
        android:id="@+id/instructions_view" >

        <TextView
            android:id="@+id/TextView01"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="A LONG TEXT 1"/>

        <TextView
            android:id="@+id/TextView02"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="A LONG TEXT 2"/>

    </LinearLayout>
</ScrollView>

Answer 1

为了使视图可滚动,它必须嵌套在ScrollView容器内:

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

请注意,ScrollView容器只能有一个子布局视图.例如,不可能将a TextView和Buttona ScrollView放在一起LinearLayout.

Answer 2

AlertDialog dialog = new AlertDialog.Builder(this)
                .setTitle("YOUR_TITLE")
                .setMessage("YOUR_MSG")
                .setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        dialog.dismiss();
                    }
                })
                .setIcon(android.R.drawable.ic_dialog_info)
                .show();
        TextView textView = (TextView) dialog.findViewById(android.R.id.message);
        textView.setMaxLines(5);
        textView.setScroller(new Scroller(this));
        textView.setVerticalScrollBarEnabled(true);
        textView.setMovementMethod(new ScrollingMovementMethod());