Implementing Alert Messages and User Input Handling in Java
This tutorial guides you through creating alert messages, handling user input, defining functions, calling functions from the `onCreate` method, and creating an XML file for user data entry validation in Java. Learn how to display alerts for empty user credentials and process user actions accordingly.
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Presentation Transcript
Alert Message Dr. Sandip Mal
Edit Java File Declare Button Variable private Button b; o public void OnClickListener(){ b=(Button)findViewById(R.id.button); b.setOnClickListener( new View.OnClickListener(){ @Override public void onClick(View v) { AlertDialog.Builder b=new AlertDialog.Builder(MainActivity.this); b.setMessage("Do you want to close the apps").setCancelable(false).setPositiveButton("Yes", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { finish(); } }).setNegativeButton("No", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { dialog.cancel(); } }); AlertDialog alert=b.create(); alert.setTitle("Alert!!!"); alert.show(); } } ); } Define the function
Assignment Create one XML file contains userid, password and submit button. If userid and password are blank and you press submit button then alert button will be displayed with blank userid or password message. If you put userid and password it will display user id and password in the alert message.
