java–Android：在DialogInterface.OnClickListener()中的int是-1

概述我不明白为什么会这样.我有以下代码：AlertDialog.Builder builder = new AlertDialog.Builder(SettingsActivityNew.this); builder.setTitle('Title'); builder.setSingleChoiceItems(R.array.example_arrays,

我不明白为什么会这样.我有以下代码：

AlertDialog.Builder builder = new AlertDialog.Builder(SettingsActivityNew.this);builder.setTitle("Title");builder.setSingleChoiceItems(R.array.example_arrays,1,null);              builder.setNegativebutton("Cancel",null);builder.setPositivebutton("OK",new DialogInterface.OnClickListener() {    public voID onClick(DialogInterface dialog,int which) {        Toast.makeText(SettingsActivityNew.this,"which: " + which,Toast.LENGTH_LONG).show();    }});builder.show();

出于一些奇怪的原因,int继续给我-1.为什么会这样？最佳答案来自doc：

Parametersdialog  The dialog that received the click.which   The button that was clicked (e.g. button1) or the position of the item clicked.

button_POSITIVE：

public static final int button_POSITIVEAdded in API level 3The IDentifIEr for the positive button.Constant Value: -1 (0xffffffff)

所以这并不奇怪,但完全正常.你每次得到-1因为你点击对话框的positivebutton 总结

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