Alert (popup) in Android
To display an Alert in android we are using AlertDialog. Example :
MainActivity.java (Any java class in which Activity is to be declared)
package com.example.admin.layouts;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
openDialog(); // To call openDialog function, you can also write code directly into it
}
public void openDialog() {
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage("Hello, Alert")
.setNegativeButton("Close", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
// Action for 'NO' Button
dialog.cancel();
}
});
//Creating dialog box
AlertDialog alert = builder.create();
//Setting the title manually
alert.setTitle("Alert Example");
alert.show();
}
}
Output
