Question

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();

由于一些奇怪的原因，int继续给我-1。为什么会这样？

Answer 1

来自doc：

Parameters
dialog  The dialog that received the click.
which   The button that was clicked (e.g. BUTTON1) or the position of the item clicked.

<小时/> BUTTON_POSITIVE：

public static final int BUTTON_POSITIVE

Added in API level 3
The identifier for the positive button.

Constant Value: -1 (0xffffffff)

所以这并不奇怪，但完全正常。每次你得-1，因为你点击了对话框的positiveButton：）

Android：int在DialogInterface.OnClickListener（）中为-1

1 个答案: