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Ali Muzaffar alphamu

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@alphamu
alphamu / Android - DIP to PX or PX to DIP
Last active February 24, 2020 16:32
Android - DIP to PX or PX to DIP
public static int dpToPx(Context context, int dp) {
Resources r = context.getResources();
float px = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dp, r.getDisplayMetrics());
return (int) px;
}
public static int pxToDp(Context context, int px) {
final float scale = context.getResources().getDisplayMetrics().density;
int dp = (int) (px * scale + 0.5f);
return dp;
@alphamu
alphamu / Android - Resize Drawable
Last active January 13, 2020 15:31
Code on how to get a bitmap from a Drawable and how to resize that bitmap and return a Drawable. This could prove to be useful if you want to manually resize a drawable or if you want to simply get a bitmap of a drawable. Note: If using Compound Drawables you can simply call `setBounds` on the drawable and set it using the `setCompoundDrawable` …
private Drawable resize(Resources r, Drawable image, int newSize) {
Bitmap b = ((BitmapDrawable)image).getBitmap();
Bitmap bitmapResized = Bitmap.createScaledBitmap(b, newSize, newSize, false);
BitmapDrawable drawableBmp = new BitmapDrawable(r, bitmapResized);
return drawableBmp;
}
@alphamu
alphamu / HorizontalBarViewGroup.java
Last active January 9, 2020 09:27
import android.annotation.TargetApi;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Color;
import android.graphics.Paint;
import android.os.Build;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
@alphamu
alphamu / Android Using Handler With Orientation Change
Created August 15, 2013 06:54
Example on how to create a static handler in an Android Activity so that there are no memory leaks and we can support orientation change and still have messages with a long delay delivered to the activity in the foreground.
package com.alimuzaffar.android.handlertest;
import java.lang.ref.WeakReference;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.Menu;
import android.view.View;
@alphamu
alphamu / ExpandableTextView.java
Created April 24, 2015 01:17
A TextView and that expand and contract to show more or less content. Using ellipses with the TextView or the TextUtils to calculate where to ellipsize text can return the wrong result as it doesn't cater for new line characters. This code will consistently returns the correct number of lines.
import android.content.Context;
import android.content.res.TypedArray;
import android.text.TextUtils;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewTreeObserver;
import android.view.ViewTreeObserver.OnGlobalLayoutListener;
import android.widget.FrameLayout;
import android.widget.TextView;
@alphamu
alphamu / CameraMicPermissionHelper.java
Last active May 17, 2019 09:03
Gist showing use cases of headless Fragments to request Android-M runtime permissions
public class CameraMicPermissionHelper extends Fragment {
private static final int REQUEST_CAMERA_MIC_PERMISSIONS = 10;
public static final String TAG = "CamMicPerm";
private CameraMicPermissionCallback mCallback;
private static boolean sCameraMicPermissionDenied;
public static CameraMicPermissionHelper newInstance() {
return new CameraMicPermissionHelper();
}
@alphamu
alphamu / UndoBarController.java
Last active May 4, 2019 12:54
This Gist demonstrates how to modify the UndoBarController created by Roman Nurik so implement functionality which will hide the UndoBar once it loses focus. Original code: https://code.google.com/p/romannurik-code/source/browse/misc/undobar/
/*
* Copyright 2012 Roman Nurik
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
@alphamu
alphamu / Android - get views with tag
Created November 4, 2013 12:32
Android get all views with a tag
public static ArrayList<View> getViewsByTag(ViewGroup root, String tag) {
ArrayList<View> views = new ArrayList<View>();
final int childCount = root.getChildCount();
for (int i = 0; i < childCount; i++) {
final View child = root.getChildAt(i);
if (child instanceof ViewGroup) {
views.addAll(getViewsByTag((ViewGroup) child, tag));
}
final Object tagObj = child.getTag();
@alphamu
alphamu / Percentages expressed as HEX values
Last active May 4, 2019 12:52
Hexadecimal percentages from from 0 - 100 in increments of 5. These are particularly useful for alpha values in ARGB strings.
100% — FF
95% — F2
90% — E6
85% — D9
80% — CC
75% — BF
70% — B3
65% — A6
60% — 99
55% — 8C
@alphamu
alphamu / BitmapUploadUsingSslHttpStack.java
Last active May 4, 2019 12:51
Simple implementation of SslHttpStack using Apache 4.2 api (compiled under a different package name so it doesn't conflict with Android). Using the SslHttpStack to upload bitmaps.
HttpClient client = sslHttpStack.getmHttpClient();
HttpEntityEnclosingRequestBase entityRequest;
entityRequest = new HttpPost("http://my-server.com.au/my-api/customer/data");
MultipartEntityBuilder entityBuilder = MultipartEntityBuilder.create();
entityBuilder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);
entityBuilder.addTextBody("someparameter", params.toString()); //params in this case is a JSONObject
String uniqueListingId = "images_to_upload"; //used to name any images being uploaded
int count = 0;