Apply gray filter to ImageView in Android

The following code is to apply gray filter to ImageView and reset the filter.

• Reference: https://stackoverflow.com/questions/28308325/androidset-gray-scale-filter-to-imageview

This code requires minSdkVersion of 16.

public class ViewUtils {
    public static void applyGrayFilter(ImageView imageView) {
        ColorMatrix matrix = new ColorMatrix();
        matrix.setSaturation(0);  //0 means grayscale
        ColorMatrixColorFilter cf = new ColorMatrixColorFilter(matrix);
        imageView.setColorFilter(cf);
        imageView.setImageAlpha(128);   // 128 = 0.5
    }

    public static void resetGrayFilter(ImageView imageView) {
        imageView.setColorFilter(null);
        imageView.setImageAlpha(255);
    }
}

Default divider color in ListView in Android

Finding the default color of the divider color in a ListView?

The following color is the default color.

?android:attr/listDivider

How to hide the keypad in Android?

If you want to hide the keypad in Android, please use the following code.

private void hideKeypad() {
    // hide keypad
    final View view = getCurrentFocus();

    if (view != null) {
        final InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
        imm.hideSoftInputFromWindow(view.getWindowToken(), 0);
    }
}

How to kill the current process in Android?

If you want to kill the current process in Android, please try to use the following code.

public void killProcess(Activity activity) {
    ActivityCompat.finishAffinity(activity);
    System.runFinalizersOnExit(true);
    System.exit(0);
}

FlashLite - A lite flashlight app for Android

If you find a light flashlight app, the following app is a good choice.

Please, get it on Google Play.

• https://play.google.com/store/apps/details?id=com.kyumpany.flashlite