Monday, July 16, 2018

Chapter 2: Android Studio

Post Author Fiqar tamin Post Time July 16, 2018 Post Labels Android

Section 2.1: Setup Android Studio

System Requirements

Microsoft® Windows® 8/7/Vista/2003 (32 or 64-bit).
Mac® OS X® 10.8.5 or higher, up to 10.9 (Mavericks)
GNOME or KDE desktop

Installation

Window

1. Download and install JDK (Java Development Kit) version 8

2. Download Android Studio

3. Launch Android Studio.exe then mention JDK path and download the latest SDK

Linux

1. Download and install JDK (Java Development Kit) version 8

2. Download Android Studio

3. Extract the zip file

4. Open terminal, cd to the extracted folder, cd to bin (example cd android-studio/bin)

5. Run ./studio.sh

Section 2.2: View And Add Shortcuts in Android Studio

By going to Settings >> Keymap A window will popup showing All the Editor Actions with the their name and shortcuts. Some of the Editor Actions do not have shortcuts. So right click on that and add a new shortcut to that.

Check the image below

Section 2.3: Android Studio useful shortcuts

The following are some of the more common/useful shortcuts.

These are based on the default IntelliJ shortcut map. You can switch to other common IDE shortcut maps via File -> Settings -> Keymap -> <Choose Eclipse/Visual Studio/etc from Keymaps dropdown>

Action	Shortcut
Format code	CTRL + ALT + L
Add unimplemented methods	CTRL + I
Show logcat	ALT + 6
Build	CTRL + F9
Build and Run	CTRL + F10
Find	CTRL + F
Find in project	CTRL + SHIFT + F
Find and replace	CTRL + R
Find and replace in project	CTRL + SHIFT + R
Override methods	CTRL + O
Show project	ALT + 1
Hide project - logcat	SHIFT + ESC
Collapse all	CTRL + SHIFT + NumPad +
View Debug Points	CTRL + SHIFT + F8
Expand all	CTRL + SHIFT + NumPad -
Open Settings	ALT + s
Select Target (open current file in Project view)	ALT + F1 → ENTER
Search Everywhere	SHIFT → SHIFT (Double shift)
Code \| Surround With	CTRL → ALT + T
Create method form selected code	ALT + CTRL

Refactor:

Action	Shortcut
Refactor This (menu/picker for all applicable refactor actions of the current element)	Mac CTRL + T - Win/Linux CTRL + ALT + T
Rename	SHIFT + F6
Extract Method	Mac CMD + ALT + M - Win/Linux CTRL + ALT + M
Extract Parameter	Mac CMD + ALT + P - Win/Linux CTRL + ALT + P
Extract Variable	Mac CMD + ALT + V - Win/Linux CTRL + ALT + V

Section 2.4: Android Studio Improve performance tip

Enable Offline Work:

1. Click File -> Settings. Search for "gradle" and click in Offline work box.
2. Go to Compiler (in same settings dialog just below Gradle) and add --offline to Command-line Options text box.

Improve Gradle Performance

Add following two line of code in your gradle.properties file.

[code hl="1, 4, 7"] org.gradle.daemon=true org.gradle.parallel=true [/code]

Increasing the value of -Xmx and -Xms in studio.vmoptions file

[code hl="1, 4, 7"] -Xms1024m -Xmx4096m -XX:MaxPermSize=1024m -XX:ReservedCodeCacheSize=256m -XX:+UseCompressedOops [/code]

Window

[code hl="1, 4, 7"] %USERPROFILE%.{FOLDER_NAME}\studio.exe.vmoptions and/or %USERPROFILE%.{FOLDER_NAME}\studio64.exe.vmoptions [/code]

Mac

[code hl="1, 4, 7"] ~/Library/Preferences/{FOLDER_NAME}/studio.vmoptions [/code]

Linux
~/.{FOLDER_NAME}/studio.vmoptions and/or ~/.{FOLDER_NAME}/studio64.vmoptions

Section 2.5: Gradle build project takes forever

Android Studio -> Preferences -> Gradle -> Tick Offline work and then restart your Android studio.

Reference screenshot:

Section 2.6: Enable/Disable blank line copy

ctrl + alt + shift + / (cmd + alt + shift + / on MacOS) should show you the following dialog:

Clicking on Registry you will get

The key you want to enable/disable is

[code hl="1, 4, 7"] editor.skip.copy.and.cut.for.empty.selection [/code]

Tested on Linux Ubuntu and MacOS.

Section 2.7: Custom colors of logcat message based on message importance

Go to File -> Settings -> Editor -> Colors & Fonts -> Android Logcat

Change the colors as you need:

Choose the appropriate color:

Section 2.8: Filter logs from UI

Android logs can be filtered directly from the UI. Using this code

[code hl="1, 4, 7"] public class MainActivity extends AppCompatActivity { private final static String TAG1 = MainActivity.class.getSimpleName(); private final static String TAG2 = MainActivity.class.getCanonicalName(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Log.e(TAG1,"Log from onCreate method with TAG1"); Log.i(TAG2,"Log from onCreate method with TAG2"); } } [/code]

If I use the regex TAG1|TAG2 and the level verbose I get

[code hl="1, 4, 7"] 01-14 10:34:46.961 12880-12880/android.doc.so.thiebaudthomas.sodocandroid E/MainActivity: Log from onCreate method with TAG1 01-14 10:34:46.961 12880-12880/android.doc.so.thiebaudthomas.sodocandroid I/androdi.doc.so.thiebaudthomas.sodocandroid.MainActivity: Log from onCreate method with TAG2 [/code]

The level can be set to get logs with given level and above. For example the verbose level will catch verbose, debug, info, warn, error and assert logs.

Using the same example, if I set the level to error, I only get

[code hl="1, 4, 7"] 01-14 10:34:46.961 12880-12880/androdi.doc.so.thiebaudthomas.sodocandroid E/MainActivity: Log from onCreate method with TAG1 [/code]

Section 2.9: Create filters configuration

Custom filters can be set and save from the UI. In the AndroidMonitor tab, click on the right dropdown (must contains Show only selected application or No filters) and select Edit filter configuration.

Enter the filter you want