Android-AlertDialog -不工作

Question

昨天，我通过助手编程，用我的安卓手机编写了一个小AlertDialog。在互联网上我找到了源代码

AlertDialog alertDialog = new AlertDialog.Builder(AlertDialogActivity.this).create();
// Setting Dialog Title
alertDialog.setTitle("Alert Dialog");
// Setting Dialog Message
alertDialog.setMessage("Welcome to AndroidHive.info");
// Setting Icon to Dialog
alertDialog.setIcon(R.drawable.tick);
// Setting OK Button
alertDialog.setButton("OK", new DialogInterface.OnClickListener() {
    public void onClick(DialogInterface dialog, int which) {
        // Write your code here to execute after dialog closed
        Toast.makeText(getApplicationContext(), "You clicked on OK", Toast.LENGTH_SHORT).show();
    }
});
// Showing Alert Message
alertDialog.show();

我已经在AIDE中测试过它，它正在工作，然后我在AndroidStudio中测试了它，但是它没有工作。为什么它在AIDE而不是Android演播室工作呢？

Answer 1

AlertDialog.Builder alertDialog = new AlertDialog.Builder(
                AlertDialogActivity.this);

按照上面的方式编辑第一行，因为您需要在创建alertDialog之前设置生成器

完整代码如下：

AlertDialog.Builder alertDialog = new AlertDialog.Builder(
                AlertDialogActivity.this);
// Setting Dialog Title
alertDialog.setTitle("Alert Dialog");

// Setting Dialog Message
alertDialog.setMessage("Welcome to AndroidHive.info");

// Setting Icon to Dialog
alertDialog.setIcon(R.drawable.tick);

// Setting OK Button
alertDialog.setButton("OK", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int which) {
        // Write your code here to execute after dialog closed
        Toast.makeText(getApplicationContext(), "You clicked on OK", Toast.LENGTH_SHORT).show();
        }
});
AlertDialog alertDialogMain = alertDialog.create();

// Showing Alert Message
alertDialogMain.show();