Android-AlertDialog

Question

昨天我通过编程的 AIDE 用我的 Android-Phone 编写了一个小的 AlertDialog。在 Internet 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 中测试过它并且它工作正常，然后我在 AndroidStudio 中测试过它但它没有工作。为什么它在 AIDE 中有效，而在 Android studio 中无效？

Answer 1

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

如上所述编辑第一行，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();

Android-AlertDialog - 不起作用

Android-AlertDialog - doesn't work

android