Friday, August 14, 2015

How to display item list in an AlertDialog 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="#d2ffe8"
    >
    <Button
        android:id="@+id/btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Change Background Color"
        />
</RelativeLayout>
MainActivity.java

package com.cfsuman.me.androidcodesnippets;

import android.app.AlertDialog;
import android.content.DialogInterface;
import android.graphics.Color;
import android.os.Bundle;
import android.app.Activity;
import android.view.View;
import android.widget.Button;
import android.widget.RelativeLayout;

import java.util.Arrays;


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);

        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("Choose a color...");

                // Initializing an array of colors
                final String[] colors = new String[]{
                        "Red",
                        "Green",
                        "Blue",
                        "Yellow"
                };

                // Set the list of items for alert dialog
                builder.setItems(colors, new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        String selectedColor = Arrays.asList(colors).get(which);
                        // Set the layout background color as user selection
                        rl.setBackgroundColor(Color.parseColor(selectedColor));
                    }
                });

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



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