Friday, August 14, 2015

How to use AlertDialog onClickListener in Android

activity_main.xml

<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/rl"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="10dp"
    tools:context=".MainActivity"
    android:background="#d7ecd6"
    >
    <TextView
        android:id="@+id/tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="This is a TextView."
        android:textColor="#ff5ff4"
        />
    <Button
        android:id="@+id/btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Apply Big Font Size"
        android:layout_below="@id/tv"
        />
</RelativeLayout>
MainActivity.java

package com.cfsuman.me.androidcodesnippets;

import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.app.Activity;
import android.util.TypedValue;
import android.view.View;
import android.widget.Button;
import android.widget.RelativeLayout;
import android.widget.TextView;


public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // Get reference of widgets from XML layout
        final RelativeLayout rl = (RelativeLayout) findViewById(R.id.rl);
        Button btn = (Button) findViewById(R.id.btn);
        final TextView tv = (TextView) findViewById(R.id.tv);

        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // Build an AlertDialog
                AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);

                // Set a title for alert dialog
                builder.setTitle("Select your answer.");

                // Ask the final question
                builder.setMessage("Want to apply big font size?");

                // Set click listener for alert dialog buttons
                DialogInterface.OnClickListener dialogClickListener = new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        switch(which){
                            case DialogInterface.BUTTON_POSITIVE:
                                // User clicked the Yes button
                                tv.setTextSize(TypedValue.COMPLEX_UNIT_DIP, 35);
                                break;

                            case DialogInterface.BUTTON_NEGATIVE:
                                // User clicked the No button
                                break;
                        }
                    }
                };

                // Set the alert dialog yes button click listener
                builder.setPositiveButton("Yes", dialogClickListener);

                // Set the alert dialog no button click listener
                builder.setNegativeButton("No",dialogClickListener);

                AlertDialog dialog = builder.create();
                // Display the alert dialog on interface
                dialog.show();
            }
        });
  }
}


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