Question

我正在尝试在点击操作栏的项目时显示AlertDialog，但没有任何反应！我是Android编程新手所以你能给我发一些代码或者告诉我怎么做吗？

感谢所有人!!

Matteo

Answer 1

好的，首先点击动作栏的项目时，你必须抓住事件吗？

@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表格..

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

你也可以这样构建你的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();

Answer 2

显示您的代码。示例可能是这样的：

@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar actions click
    switch (item.getItemId()) {
    case R.id.itemid:
           new AlertDialog.Builder(this)
           .setMessage("Message")
           .setCancelable(false)
           .setPositiveButton("Yes", new DialogInterface.OnClickListener() {
           public void onClick(DialogInterface dialog, int id) {
               //code if yes
           }
           })
           .setNegativeButton("No", null)
           .show();

       return true;
        default:
            return super.onOptionsItemSelected(item);
    }
}

android：从操作栏显示警告对话框

2 个答案: