How to get sha1 key in android studio

get SHA1 in Android Studio

If you have android studio then it is very very simple. Just create a MapActivity using android studio and after creating it go into google_maps_api.xml and in there there will be a link given in comments. If you paste it in your browser, it will ask a few details to be filled and after that your api will be generated. No need of using keytool and all.

1. Click on your package and choose New -> Google -> Google Maps Activity
2. Android Studio redirect you to google_maps_api.xml

And you will see all you need to get google_maps_key

SHA1 Key in Android Studio

Follow @amardeepvijay

Read More !

Difference between padding and margin

Padding is used to offset the content of a view by specifying pixels. For example a left padding of 2 wil push views content 2 pixels right side of the left edge. Use android:padding

android:paddingBottom,android:paddingLeft,android:paddingRight,android:paddingTop to set padding on various sides of the content of that view.

Margin specifies the extra space left on all four sides of a view. Margin space is generally outside the view's bounds. To leave space on left side use android:margin_left, to leave space on other sides use android:layout_marginRight, android:layout_marginTop, android:layout_marginBottom etc..

In Simple words .. if you want to take your widget like TextView, EditText far away from other. You should use margin from top,right,left,bottom.

By increasing padding it will increase the inner spacing not making the widget far apart from others..

"Padding is inside of a View.Margin is outside of a View."

This difference may be relevant to background or size properties.

Margin:-

Margins make up the vertical and horizontal areas between elements. If elements have no margins around them, they will bump right up against each other. In other words, he space outside of, or between, elements is what comprises the margin areas.

Padding:-

The padding of an element is the horizontal and vertical space that’s set around the content area of the targeted element. So padding is on the inside of a box, not the outside.

Follow @amardeepvijay

Read More !

What is the use of asynctask in android ?

AsyncTask enables proper and easy use of the UI thread. This class allows to perform background operations and publish results on the UI thread without having to manipulate threads and/or handlers.

An asynchronous task is defined by a computation that runs on a background thread and whose result is published on the UI thread. An asynchronous task is defined by 3 generic types, called Params, Progress and Result.and 4 steps, called onPreExecute, doInBackground, onProgressUpdate and onPostExecute.


AsyncTask's generic types

---

The three types used by an asynchronous task are the following:

1. Params, the type of the parameters sent to the task upon execution.
2. Progress, the type of the progress units published during the background computation.
3. Result, the type of the result of the background computation.

Not all types are always used by an asynchronous task. To mark a type as unused, simply use the type Void:

 private class MyTask extends AsyncTask<Void, Void, Void> { ... }

The 4 steps

---

When an asynchronous task is executed, the task goes through 4 steps:

1. onPreExecute(), invoked on the UI thread before the task is executed. This step is normally used to setup the task, for instance by showing a progress bar in the user interface.
2. doInBackground(Params...), invoked on the background thread immediately after onPreExecute() finishes executing. This step is used to perform background computation that can take a long time. The parameters of the asynchronous task are passed to this step. The result of the computation must be returned by this step and will be passed back to the last step. This step can also use publishProgress(Progress...) to publish one or more units of progress. These values are published on the UI thread, in the onProgressUpdate(Progress...) step.
3. onProgressUpdate(Progress...), invoked on the UI thread after a call to publishProgress(Progress...). The timing of the execution is undefined. This method is used to display any form of progress in the user interface while the background computation is still executing. For instance, it can be used to animate a progress bar or show logs in a text field.
4. onPostExecute(Result), invoked on the UI thread after the background computation finishes. The result of the background computation is passed to this step as a parameter.

Cancelling a task

---

A task can be cancelled at any time by invoking cancel(boolean). Invoking this method will cause subsequent calls to isCancelled() to return true. After invoking this method, onCancelled(Object), instead of onPostExecute(Object) will be invoked after doInBackground(Object[]) returns. To ensure that a task is cancelled as quickly as possible, you should always check the return value of isCancelled() periodically from doInBackground(Object[]), if possible (inside a loop for instance.)

Threading rules

---

There are a few threading rules that must be followed for this class to work properly:

• The AsyncTask class must be loaded on the UI thread. This is done automatically as of JELLY_BEAN.
• The task instance must be created on the UI thread.
• execute(Params...) must be invoked on the UI thread.
• Do not call onPreExecute(), onPostExecute(Result), doInBackground(Params...), onProgressUpdate(Progress...) manually.
• The task can be executed only once (an exception will be thrown if a second execution is attempted.)

Follow @amardeepvijay

Read More !

Difference between Service, Async Task & Thread?

• Service is like an Activity but has no interface. Probably if you want to fetch the weather for example you won't create a blank activity for it, for this you will use a Service.
• A Thread is a Thread, probably you already know it from other part. You need to know that you cannot update UI from a Thread. You need to use a Handler for this, but read further.
• An AsyncTask is an intelligent Thread that is advised to be used. Intelligent as it can help with it's methods, and there are two methods that run on UI thread, which is good to update UI components.

	Service	Thread	IntentService	AsyncTask
When to use ?	Task with no UI, but shouldn't be too long. Use threads within service for long tasks.	- Long task in general. - For tasks in parallel use Multiple threads (traditional mechanisms)	- Long task usually with no communication to main thread. (Update)- If communication is required, can use main thread handler or broadcast intents - When callbacks are needed (Intent triggered tasks).	- Small task having to communicate with main thread. - For tasks in parallel use multiple instances OR Executor
Trigger	Call to method onStartService()	Thread start() method	Intent	Call to method execute()
Triggered From (thread)	Any thread	Any Thread	Main Thread (Intent is received on main thread and then worker thread is spawed)	Main Thread
Runs On (thread)	Main Thread	Its own thread	Separate worker thread	Worker thread. However, Main thread methods may be invoked in between to publish progress.
Limitations / Drawbacks	May block main thread	- Manual thread management - Code may become difficult to read	- Cannot run tasks in parallel. - Multiple intents are queued on the same worker thread.	- one instance can only be executed once (hence cannot run in a loop)  - Must be created and executed from the Main thread

Follow @amardeepvijay

Read More !

Material Design Colors

This color palette comprises primary and accent colors that can be used for illustration or to develop your brand colors. They’ve been designed to work harmoniously with each other.
The color palette starts with primary colors and fills in the spectrum to create a complete and usable palette for Android, Web, and iOS. Google suggests using the 500 colors as the primary colors in your app and the other colors as accents colors.

Reference site :- Matrial Design Color

<?xml version="1.0" encoding="utf-8"?>

<resources>
    <color name="md_red_500_primary">#F44336</color>
    <!-- light -->
    <color name="md_red_50">#FFEBEE</color>
    <color name="md_red_100">#FFCDD2</color>
    <color name="md_red_200">#EF9A9A</color>
    <color name="md_red_300">#E57373</color>
    <color name="md_red_400">#EF5350</color>
    <!-- dark -->
    <color name="md_red_600">#E53935</color>
    <color name="md_red_700">#D32F2F</color>
    <color name="md_red_800">#C62828</color>
    <color name="md_red_900">#B71C1C</color>

    <!-- light -->
    <color name="md_red_a100">#FF8A80</color>
    <!-- dark -->
    <color name="md_red_a200">#FF5252</color>
    <color name="md_red_a400">#FF1744</color>
    <color name="md_red_a700">#D50000</color>


    <!-- PINK -->
    <!-- dark -->
    <color name="md_pink_500_primary">#E91E63</color>
    <color name="md_pink_50">#FCE4EC</color>
    <color name="md_pink_100">#F8BBD0</color>
    <color name="md_pink_200">#F48FB1</color>
    <color name="md_pink_300">#F06292</color>
    <color name="md_pink_400">#EC407A</color>
    <!-- dark -->
    <color name="md_pink_600">#D81B60</color>
    <color name="md_pink_700">#C2185B</color>
    <color name="md_pink_800">#AD1457</color>
    <color name="md_pink_900">#880E4F</color>

    <!-- light -->
    <color name="md_pink_A100">#FF80AB</color>
    <!-- dark -->
    <color name="md_pink_A200">#FF4081</color>
    <color name="md_pink_A400">#F50057</color>
    <color name="md_pink_A700">#C51162</color>


    <!-- PURPLE -->
    <!-- dark -->
    <color name="md_purple_500_primary">#9C27B0</color>
    <!-- light -->
    <color name="md_purple_50">#F3E5F5</color>
    <color name="md_purple_100">#E1BEE7</color>
    <color name="md_purple_200">#CE93D8</color>
    <!-- dark -->
    <color name="md_purple_300">#BA68C8</color>
    <color name="md_purple_400">#AB47BC</color>
    <color name="md_purple_600">#8E24AA</color>
    <color name="md_purple_700">#7B1FA2</color>
    <color name="md_purple_800">#6A1B9A</color>
    <color name="md_purple_900">#4A148C</color>

    <!-- light -->
    <color name="md_purple_A100">#EA80FC</color>
    <!-- dark -->
    <color name="md_purple_A200">#E040FB</color>
    <color name="md_purple_A400">#D500F9</color>
    <color name="md_purple_A700">#AA00FF</color>


    <!-- DEEP PURPLE-->
    <!-- dark -->
    <color name="md_deep_purple_500_primary">#673AB7</color>
    <!-- light -->
    <color name="md_deep_purple_50">#EDE7F6</color>
    <color name="md_deep_purple_100">#D1C4E9</color>
    <color name="md_deep_purple_200">#B39DDB</color>
    <!-- dark -->
    <color name="md_deep_purple_300">#9575CD</color>
    <color name="md_deep_purple_400">#7E57C2</color>
    <color name="md_deep_purple_600">#5E35B1</color>
    <color name="md_deep_purple_700">#512DA8</color>
    <color name="md_deep_purple_800">#4527A0</color>
    <color name="md_deep_purple_900">#311B92</color>

    <!-- light -->
    <color name="md_deep_purple_A100">#B388FF</color>
    <!-- dark -->
    <color name="md_deep_purple_A200">#7C4DFF</color>
    <color name="md_deep_purple_A400">#651FFF</color>
    <color name="md_deep_purple_A700">#6200EA</color>


    <!-- INDIGO -->
    <!-- dark -->
    <color name="md_indigo_500_primary">#3F51B5</color>
    <!-- light -->
    <color name="md_indigo_50">#E8EAF6</color>
    <color name="md_indigo_100">#C5CAE9</color>
    <color name="md_indigo_200">#9FA8DA</color>
    <!-- dark -->
    <color name="md_indigo_300">#7986CB</color>
    <color name="md_indigo_400">#5C6BC0</color>
    <color name="md_indigo_600">#3949AB</color>
    <color name="md_indigo_700">#303F9F</color>
    <color name="md_indigo_800">#283593</color>
    <color name="md_indigo_900">#1A237E</color>

    <!-- light -->
    <color name="md_indigo_A100">#8C9EFF</color>
    <!-- dark -->
    <color name="md_indigo_A200">#536DFE</color>
    <color name="md_indigo_A400">#3D5AFE</color>
    <color name="md_indigo_A700">#304FFE</color>


    <!-- BLUE -->
    <!-- dark -->
    <color name="md_blue_500_primary">#2196F3</color>
    <!-- light -->
    <color name="md_blue_50">#E3F2FD</color>
    <color name="md_blue_100">#BBDEFB</color>
    <color name="md_blue_200">#90CAF9</color>
    <color name="md_blue_300">#64B5F6</color>
    <color name="md_blue_400">#42A5F5</color>
    <!-- dark -->
    <color name="md_blue_600">#1E88E5</color>
    <color name="md_blue_700">#1976D2</color>
    <color name="md_blue_800">#1565C0</color>
    <color name="md_blue_900">#0D47A1</color>

    <!-- dark -->
    <color name="md_blue_A100">#82B1FF</color>
    <!-- light -->
    <color name="md_blue_A200">#448AFF</color>
    <color name="md_blue_A400">#2979FF</color>
    <color name="md_blue_A700">#2962FF</color>


    <!-- LIGHT BLUE -->
    <!-- dark -->
    <color name="md_light_blue_500_primary">#03A9F4</color>
    <!-- light -->
    <color name="md_light_blue_50">#E1F5FE</color>
    <color name="md_light_blue_100">#B3E5FC</color>
    <color name="md_light_blue_200">#81D4FA</color>
    <color name="md_light_blue_300">#4FC3F7</color>
    <color name="md_light_blue_400">#29B6F6</color>
    <!-- dark -->
    <color name="md_light_blue_600">#039BE5</color>
    <color name="md_light_blue_700">#0288D1</color>
    <color name="md_light_blue_800">#0277BD</color>
    <color name="md_light_blue_900">#01579B</color>

    <!-- light -->
    <color name="md_light_blue_A100">#80D8FF</color>
    <color name="md_light_blue_A200">#40C4FF</color>
    <color name="md_light_blue_A400">#00B0FF</color>
    <!-- dark -->
    <color name="md_light_blue_A700">#0091EA</color>


    <!-- CYAN -->
    <!-- dark -->
    <color name="md_cyan_500_primary">#00BCD4</color>
    <!-- light -->
    <color name="md_cyan_50">#E0F7FA</color>
    <color name="md_cyan_100">#B2EBF2</color>
    <color name="md_cyan_200">#80DEEA</color>
    <color name="md_cyan_300">#4DD0E1</color>
    <color name="md_cyan_400">#26C6DA</color>
    <!-- dark -->
    <color name="md_cyan_600">#00ACC1</color>
    <color name="md_cyan_700">#0097A7</color>
    <color name="md_cyan_800">#00838F</color>
    <color name="md_cyan_900">#006064</color>

    <!-- light -->
    <color name="md_cyan_A100">#84FFFF</color>
    <color name="md_cyan_A200">#18FFFF</color>
    <color name="md_cyan_A400">#00E5FF</color>
    <color name="md_cyan_A700">#00B8D4</color>


    <!-- TEAL -->
    <!-- dark -->
    <color name="md_teal_500_primary">#009688</color>
    <!-- light -->
    <color name="md_teal_50">#E0F2F1</color>
    <color name="md_teal_100">#B2DFDB</color>
    <color name="md_teal_200">#80CBC4</color>
    <color name="md_teal_300">#4DB6AC</color>
    <color name="md_teal_400">#26A69A</color>
    <!-- dark -->
    <color name="md_teal_600">#00897B</color>
    <color name="md_teal_700">#00796B</color>
    <color name="md_teal_800">#00695C</color>
    <color name="md_teal_900">#004D40</color>

    <!-- light -->
    <color name="md_teal_A100">#A7FFEB</color>
    <color name="md_teal_A200">#64FFDA</color>
    <color name="md_teal_A400">#1DE9B6</color>
    <color name="md_teal_A700">#00BFA5</color>

    <!-- GREEN -->
    <!-- dark -->
    <color name="md_green_500_primary">#4CAF50</color>
    <!-- light -->
    <color name="md_green_50">#E8F5E9</color>
    <color name="md_green_100">#C8E6C9</color>
    <color name="md_green_200">#A5D6A7</color>
    <color name="md_green_300">#81C784</color>
    <color name="md_green_400">#66BB6A</color>
    <!-- dark -->
    <color name="md_green_600">#43A047</color>
    <color name="md_green_700">#388E3C</color>
    <color name="md_green_800">#2E7D32</color>
    <color name="md_green_900">#1B5E20</color>

    <!-- light -->
    <color name="md_green_A100">#B9F6CA</color>
    <color name="md_green_A200">#69F0AE</color>
    <color name="md_green_A400">#00E676</color>
    <color name="md_green_A700">#00C853</color>


    <!-- LIGHT GREEN -->
    <!-- dark -->
    <color name="md_light_green_500_primary">#8BC34A</color>
    <!-- light -->
    <color name="md_light_green_50">#F1F8E9</color>
    <color name="md_light_green_100">#DCEDC8</color>
    <color name="md_light_green_200">#C5E1A5</color>
    <color name="md_light_green_300">#AED581</color>
    <color name="md_light_green_400">#9CCC65</color>
    <color name="md_light_green_600">#7CB342</color>
    <color name="md_light_green_700">#689F38</color>
    <!-- dark -->
    <color name="md_light_green_800">#558B2F</color>
    <color name="md_light_green_900">#33691E</color>

    <!-- light -->
    <color name="md_light_green_A100">#CCFF90</color>
    <color name="md_light_green_A200">#B2FF59</color>
    <color name="md_light_green_A400">#76FF03</color>
    <color name="md_light_green_A700">#64DD17</color>


    <!-- LIME -->
    <!-- light -->
    <color name="md_lime_500_primary">#CDDC39</color>
    <color name="md_lime_50">#F9FBE7</color>
    <color name="md_lime_100">#F0F4C3</color>
    <color name="md_lime_200">#E6EE9C</color>
    <color name="md_lime_300">#DCE775</color>
    <color name="md_lime_400">#D4E157</color>
    <color name="md_lime_600">#C0CA33</color>
    <color name="md_lime_700">#AFB42B</color>
    <color name="md_lime_800">#9E9D24</color>
    <!-- dark -->
    <color name="md_lime_900">#827717</color>

    <!-- light -->
    <color name="md_lime_A100">#F4FF81</color>
    <color name="md_lime_A200">#EEFF41</color>
    <color name="md_lime_A400">#C6FF00</color>
    <color name="md_lime_A700">#AEEA00</color>


    <!-- YELLOW -->
    <!-- light -->
    <color name="md_yellow_500_primary">#FFEB3B</color>
    <color name="md_yellow_50">#FFFDE7</color>
    <color name="md_yellow_100">#FFF9C4</color>
    <color name="md_yellow_200">#FFF59D</color>
    <color name="md_yellow_300">#FFF176</color>
    <color name="md_yellow_400">#FFEE58</color>
    <color name="md_yellow_600">#F9A825</color>
    <color name="md_yellow_700">#FBC02D</color>
    <color name="md_yellow_800">#F9A825</color>
    <color name="md_yellow_900">#F57F17</color>

    <color name="md_yellow_A100">#FFFF8D</color>
    <color name="md_yellow_A200">#FFFF00</color>
    <color name="md_yellow_A400">#FFEA00</color>
    <color name="md_yellow_A700">#FFD600</color>


    <!-- Amber -->
    <!-- light -->
    <color name="md_amber_500_primary">#FFC107</color>
    <color name="md_amber_50">#FFF8E1</color>
    <color name="md_amber_100">#FFECB3</color>
    <color name="md_amber_200">#FFE082</color>
    <color name="md_amber_300">#FFD54F</color>
    <color name="md_amber_400">#FFCA28</color>
    <color name="md_amber_600">#FFB300</color>
    <color name="md_amber_700">#FFA000</color>
    <color name="md_amber_800">#FF8F00</color>
    <color name="md_amber_900">#FF6F00</color>

    <color name="md_amber_A100">#FFE57F</color>
    <color name="md_amber_A200">#FFD740</color>
    <color name="md_amber_A400">#FFC400</color>
    <color name="md_amber_A700">#FFAB00</color>


    <!-- ORANGE -->
    <!-- light -->
    <color name="md_orange_500_primary">#FF9800</color>
    <color name="md_orange_50">#FFF3E0</color>
    <color name="md_orange_100">#FFE0B2</color>
    <color name="md_orange_200">#FFCC80</color>
    <color name="md_orange_300">#FFB74D</color>
    <color name="md_orange_400">#FFA726</color>
    <color name="md_orange_600">#FB8C00</color>
    <color name="md_orange_700">#F57C00</color>
    <!-- dark -->
    <color name="md_orange_800">#EF6C00</color>
    <color name="md_orange_900">#E65100</color>

    <!-- light -->
    <color name="md_orange_A100">#FFD180</color>
    <color name="md_orange_A200">#FFAB40</color>
    <color name="md_orange_A400">#FF9100</color>
    <color name="md_orange_A700">#FF6D00</color>


    <!-- DEEP ORANGE-->
    <!-- dark -->
    <color name="md_deep_orange_500_primary">#FF5722</color>
    <!-- light -->
    <color name="md_deep_orange_50">#FBE9E7</color>
    <color name="md_deep_orange_100">#FFCCBC</color>
    <color name="md_deep_orange_200">#FFAB91</color>
    <color name="md_deep_orange_300">#FF8A65</color>
    <color name="md_deep_orange_400">#FF7043</color>
    <!-- dark -->
    <color name="md_deep_orange_600">#F4511E</color>
    <color name="md_deep_orange_700">#E64A19</color>
    <color name="md_deep_orange_800">#D84315</color>
    <color name="md_deep_orange_900">#BF360C</color>

    <color name="md_deep_orange_A100">#FF9E80</color>
    <color name="md_deep_orange_A200">#FF6E40</color>
    <!-- light -->
    <color name="md_deep_orange_A400">#FF3D00</color>
    <color name="md_deep_orange_A700">#DD2C00</color>


    <!-- BROWN -->
    <!-- dark -->
    <color name="md_brown_500_primary">#795548</color>
    <!-- light -->
    <color name="md_brown_50">#EFEBE9</color>
    <color name="md_brown_100">#D7CCC8</color>
    <color name="md_brown_200">#BCAAA4</color>
    <!-- dark -->
    <color name="md_brown_300">#A1887F</color>
    <color name="md_brown_400">#8D6E63</color>
    <color name="md_brown_600">#6D4C41</color>
    <color name="md_brown_700">#5D4037</color>
    <color name="md_brown_800">#4E342E</color>
    <color name="md_brown_900">#3E2723</color>

    <!-- GREY -->
    <!-- light -->
    <color name="md_grey_500_primary">#9E9E9E</color>
    <color name="md_grey_50">#FAFAFA</color>
    <color name="md_grey_100">#F5F5F5</color>
    <color name="md_grey_200">#EEEEEE</color>
    <color name="md_grey_300">#E0E0E0</color>
    <color name="md_grey_400">#BDBDBD</color>
    <!-- dark -->
    <color name="md_grey_600">#757575</color>
    <color name="md_grey_700">#616161</color>
    <color name="md_grey_800">#424242</color>
    <color name="md_grey_900">#212121</color>


    <!-- BLUE GRAY -->
    <!-- dark -->
    <color name="md_blue_grey_500_primary">#607D8B</color>
    <!-- light -->
    <color name="md_blue_grey_50">#ECEFF1</color>
    <color name="md_blue_grey_100">#CFD8DC</color>
    <color name="md_blue_grey_200">#B0BEC5</color>
    <color name="md_blue_grey_300">#90A4AE</color>
    <!-- dark -->
    <color name="md_blue_grey_400">#78909C</color>
    <color name="md_blue_grey_600">#546E7A</color>
    <color name="md_blue_grey_700">#455A64</color>
    <color name="md_blue_grey_800">#37474F</color>
    <color name="md_blue_grey_900">#263238</color>

    <color name="md_black">#000000</color>
    <color name="md_white">#FFFFFF</color>

</resources>

Follow @amardeepvijay

Read More !