android - Blur Background Behind AlertDialog

Android - Blur Background Behind AlertDialog

To create a blurred background behind an AlertDialog in Android, you can use a custom dialog with a BlurView. Here's a step-by-step guide:

Step 1: Add Dependencies

Add the BlurView library to your build.gradle file:

dependencies { implementation 'com.eightbitlab:blurview:2.0.1' }

Step 2: Create the Layout for the Dialog

Create a custom layout for your dialog (e.g., dialog_layout.xml):

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical" android:padding="16dp"> <TextView android:id="@+id/dialog_title" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="Dialog Title" android:textSize="20sp" android:textStyle="bold" /> <TextView android:id="@+id/dialog_message" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="This is the dialog message." /> <Button android:id="@+id/dialog_button" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="OK" /> </LinearLayout>

Step 3: Create the Dialog in Your Activity

In your Activity, set up the AlertDialog with the blurred background:

import android.graphics.Bitmap; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.TextView; import androidx.appcompat.app.AlertDialog; import androidx.appcompat.app.AppCompatActivity; import com.eightbitlab.blurview.BlurView; public class MainActivity extends AppCompatActivity { private BlurView blurView; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); // Show the dialog when needed showBlurredDialog(); } private void showBlurredDialog() { // Inflate the custom dialog layout View dialogView = getLayoutInflater().inflate(R.layout.dialog_layout, null); // Create the AlertDialog AlertDialog dialog = new AlertDialog.Builder(this) .setView(dialogView) .setCancelable(true) .create(); // Set up BlurView blurView = new BlurView(this); blurView.setBlurBackground(0.5f, 10); // Set the dialog view and display dialog.setView(dialogView); dialog.show(); // Set the button listener Button button = dialogView.findViewById(R.id.dialog_button); button.setOnClickListener(v -> dialog.dismiss()); // Blur background setupBlurView(dialogView); } private void setupBlurView(View dialogView) { // Get the root view to blur View decorView = getWindow().getDecorView(); Bitmap bitmap = decorView.getDrawingCache(); // Configure BlurView blurView.setOverlayColor(0xAA000000); // Optional: Add overlay color blurView.setBlurredBitmap(bitmap); } }

Step 4: Adjust Background Blurring

In the setupBlurView() method, you can adjust the blur parameters to achieve your desired effect.

Notes

  • Ensure you have the correct permissions and settings for drawing on the screen.
  • The BlurView will blur the entire screen behind the dialog, creating a nice visual effect.

Summary

By using a custom layout with BlurView, you can create a visually appealing AlertDialog with a blurred background effect in your Android application. Adjust the parameters as needed to suit your design.

Examples

  1. How to create a blurred background effect behind AlertDialog in Android.

    • Description: Shows how to apply a blur effect to the background when an AlertDialog is displayed.
    • Code:
      // Blur background behind AlertDialog AlertDialog.Builder builder = new AlertDialog.Builder(context); AlertDialog dialog = builder.create(); Window window = dialog.getWindow(); WindowManager.LayoutParams layoutParams = window.getAttributes(); layoutParams.dimAmount = 0.8f; // Adjust the dim amount as needed window.addFlags(WindowManager.LayoutParams.FLAG_DIM_BEHIND); window.setAttributes(layoutParams);

  2. Applying a blur effect behind a custom AlertDialog layout in Android.

    • Description: Demonstrates applying a blur effect when using a custom layout for AlertDialog.
    • Code:
      // Blur effect for custom AlertDialog layout AlertDialog.Builder builder = new AlertDialog.Builder(context); LayoutInflater inflater = getLayoutInflater(); View dialogLayout = inflater.inflate(R.layout.custom_dialog_layout, null); builder.setView(dialogLayout); AlertDialog dialog = builder.create(); Window window = dialog.getWindow(); if (window != null) { WindowManager.LayoutParams layoutParams = window.getAttributes(); layoutParams.dimAmount = 0.8f; // Adjust the dim amount as needed window.addFlags(WindowManager.LayoutParams.FLAG_DIM_BEHIND); window.setAttributes(layoutParams); }

  3. How to blur the background when AlertDialogFragment is displayed.

    • Description: Shows usage of AlertDialogFragment along with background blur effect.
    • Code:
      // Blur background for AlertDialogFragment AlertDialogFragment fragment = new AlertDialogFragment(); fragment.show(getSupportFragmentManager(), "dialog_fragment_tag"); // Inside AlertDialogFragment onCreateView or onViewCreated Window window = getDialog().getWindow(); if (window != null) { WindowManager.LayoutParams layoutParams = window.getAttributes(); layoutParams.dimAmount = 0.8f; // Adjust the dim amount as needed window.addFlags(WindowManager.LayoutParams.FLAG_DIM_BEHIND); window.setAttributes(layoutParams); }

  4. Applying Gaussian blur to the background of an AlertDialog in Android.

    • Description: Illustrates using RenderScript to achieve a Gaussian blur effect behind AlertDialog.
    • Code:
      // Gaussian blur effect behind AlertDialog AlertDialog.Builder builder = new AlertDialog.Builder(context); AlertDialog dialog = builder.create(); Window window = dialog.getWindow(); if (window != null) { RenderScript rs = RenderScript.create(context); ScriptIntrinsicBlur blurScript = ScriptIntrinsicBlur.create(rs, Element.U8_4(rs)); Allocation input = Allocation.createFromBitmap(rs, yourBackgroundBitmap); Allocation output = Allocation.createTyped(rs, input.getType()); blurScript.setRadius(25.f); // Adjust the blur radius as needed blurScript.setInput(input); blurScript.forEach(output); output.copyTo(yourBlurredBitmap); window.setBackgroundDrawable(new BitmapDrawable(getResources(), yourBlurredBitmap)); }

  5. How to blur the background behind AlertDialog using WindowManager.LayoutParams.

    • Description: Uses WindowManager.LayoutParams to blur the background of AlertDialog dynamically.
    • Code:
      // Blur background using WindowManager.LayoutParams AlertDialog.Builder builder = new AlertDialog.Builder(context); AlertDialog dialog = builder.create(); Window window = dialog.getWindow(); if (window != null) { WindowManager.LayoutParams layoutParams = window.getAttributes(); layoutParams.dimAmount = 0.8f; // Adjust the dim amount as needed window.addFlags(WindowManager.LayoutParams.FLAG_DIM_BEHIND); window.setAttributes(layoutParams); }

  6. Applying a frosted glass effect behind AlertDialog in Android.

    • Description: Shows how to mimic a frosted glass effect with background blur for AlertDialog.
    • Code:
      // Frosted glass effect for AlertDialog AlertDialog.Builder builder = new AlertDialog.Builder(context); AlertDialog dialog = builder.create(); Window window = dialog.getWindow(); if (window != null) { window.setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT)); window.setFlags(WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE, WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE); window.addFlags(WindowManager.LayoutParams.FLAG_BLUR_BEHIND); }

  7. How to blur the background behind AlertDialog with CrossfadeAnimator.

    • Description: Uses CrossfadeAnimator to smoothly animate background blur effect for AlertDialog.
    • Code:
      // CrossfadeAnimator for background blur in AlertDialog AlertDialog.Builder builder = new AlertDialog.Builder(context); AlertDialog dialog = builder.create(); Window window = dialog.getWindow(); if (window != null) { window.setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT)); CrossfadeAnimator.animate(window, true); }

  8. Applying a translucent background with blur effect for AlertDialog in Android.

    • Description: Demonstrates setting a translucent background with blur effect for AlertDialog.
    • Code:
      // Translucent background with blur for AlertDialog AlertDialog.Builder builder = new AlertDialog.Builder(context); AlertDialog dialog = builder.create(); Window window = dialog.getWindow(); if (window != null) { window.setBackgroundDrawableResource(android.R.color.transparent); WindowManager.LayoutParams layoutParams = window.getAttributes(); layoutParams.dimAmount = 0.5f; // Adjust the dim amount as needed window.addFlags(WindowManager.LayoutParams.FLAG_DIM_BEHIND); window.setAttributes(layoutParams); }

  9. How to blur the background behind AlertDialog using DialogFragment.

    • Description: Shows implementation of DialogFragment with blurred background for AlertDialog.
    • Code:
      // Blur background for AlertDialog using DialogFragment AlertDialogFragment fragment = new AlertDialogFragment(); fragment.show(getSupportFragmentManager(), "dialog_fragment_tag"); // Inside AlertDialogFragment onCreateView or onViewCreated Window window = getDialog().getWindow(); if (window != null) { window.setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT)); window.setFlags(WindowManager.LayoutParams.FLAG_BLUR_BEHIND, WindowManager.LayoutParams.FLAG_BLUR_BEHIND); }

  10. Applying a blur effect to the background when AlertDialog is shown in Android.

    • Description: Shows a basic approach to blur the background when displaying AlertDialog.
    • Code:
      // Basic blur effect for AlertDialog background AlertDialog.Builder builder = new AlertDialog.Builder(context); AlertDialog dialog = builder.create(); Window window = dialog.getWindow(); if (window != null) { WindowManager.LayoutParams layoutParams = window.getAttributes(); layoutParams.dimAmount = 0.8f; // Adjust the dim amount as needed window.addFlags(WindowManager.LayoutParams.FLAG_DIM_BEHIND); window.setAttributes(layoutParams); }

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