android:从操作栏显示一个警告对话框

Question

我试图在单击操作栏的项目时显示 AlertDialog，但没有任何反应!!!我是 Android 编程的新手，您能给我发一些代码或告诉我如何操作吗？

谢谢大家!!

马特奥

Answer 1

好的，首先你必须在操作栏的项目被右击时捕获事件 onclick 吗？

@Override
public boolean onOptionsItemSelected(MenuItem item)
{
    if (item.getItemId() == android.R.id.home)   //the androi.r.id.home have to changed
                                                 //for the id of your button.
    {
       ///here is where you have to show the alertdialog!!!!
    } 
}




public boolean onOptionsItemSelected(MenuItem item) 
{
        //This is the layout that you are going to use in your alertdialog
        final View addView = getLayoutInflater().inflate(R.layout.add, null);

        new AlertDialog.Builder(this).setTitle("Add a Word").setView(addView)
                .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int whichButton) {
                        addWord((TextView) addView.findViewById(R.id.title));
                    }
                }).setNegativeButton("Cancel", null).show();

         return (super.onOptionsItemSelected(item));
}

在这里获取完整的源代码表格..

http://vimaltuts.com/android-tutorial-for-beginners/android-action-bar-tab-menu-example

您也可以像这样构建您的 AlertDialgog:

new AlertDialog.Builder(this)
   .setTitle("Delete entry")
   .setMessage("Are you sure you want to delete this entry?")
   .setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {
       public void onClick(DialogInterface dialog, int which) { 
        // continue with delete
      }
    })
   .setNegativeButton(android.R.string.no, new DialogInterface.OnClickListener() {
    public void onClick(DialogInterface dialog, int which) { 
        // do nothing
      }
    })
    .setIcon(android.R.drawable.ic_dialog_alert)
 .show();