在横屏模式下使用大文本框的AlertDialog，以便用户能够方便地输入文本。以下是一个示例代码：

public class MyActivity extends Activity {

    public void showDialog() {
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle("Enter your text:");

        // Create a larger EditText view
        final EditText input = new EditText(this);
        input.setLayoutParams(new LinearLayout.LayoutParams(
            LinearLayout.LayoutParams.MATCH_PARENT,
            LinearLayout.LayoutParams.MATCH_PARENT));
        input.setGravity(Gravity.TOP);
        builder.setView(input);

        builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {
                String text = input.getText().toString();
                // Do something with the text
            }
        });

        builder.setNegativeButton("Cancel", null);

        builder.show();
    }
}