var ctx=com.mojang.minecraftpe.MainActivity.currentMainActivity.get();
function b()
{
ctx.runOnUiThread(
new java.lang.Runnable(
{
run:function()
{
try
{
var layout=new android.widget.LinearLayout(ctx);
var slayout=new android.widget.ScrollView(ctx);
slayout.addView(layout);
layout.setOrientation(new android.widget.LinearLayout.VERTICAL);
var dialog=new android.app.Dialog(ctx);
dialog.setTitle( "/123")
dialog.setContentView(slayout);
var button=new android.widget.button(ctx);
button.setText("back");
button.setOnClickListener(
new android.view.View.OnClickListener(
{
onclick:function(v)
{
dialog.dismiss()
}}))
layout.addView(button);
dialog.show()
}
catch(err)
{clientMessage(err);}
}}))}

layout.setOrientation(new android.widget.LinearLayout.VERTICAL);
这一行有错误