16-04-2021

How To Find Unused Classes In Android Studio

I’ve found an unused string resource, like:

How To Find Unused Classes In Android Studio Windows 10
How To Find Unused Classes In Android Studio Software
How To Find Unused Classes In Android Studio App

However it is in tens of files, of different languages, in different strings.xml files in values, values-af, values-be, etc folders.

Simple, right click on your project in Android Studio, then click on the Optimize Imports that should work. To do same thing which I described above, you can do same just pressing Ctrl+Alt+O, it will optimize imports of your current file and your entire project depends on your selection in a dialog.
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I must have missed something not to know any way to do this in Android Studio other than modifying it by hand one by one.

tl;dr How to delete an unused string resource for all configurations?

In the android studio (or more generally in the Intellij IDEA) you can specify inspection code that you want to analyze from Analyze-Inspect Code. And then define the scope of your code. You can see the result for my code in the below picture: In Declaration redundancy you can see that 'someMethod' is declared unused. You can analize your whole project to find xml, code and all things that are unused or not required with Lint With this you can find unused classes, resources, security leaks, refactor suggestions and more, its really usefull First right click on your project main package, select analyze - inspect code After that. Press Ctrl + Shift + A (in Mac Command + Shift + A).

Answers:

It is now possible inside Android Studio.
After Lint checks you see an option on the right Remove All Unused Resources!

To Delete a single string resource across all locale files, you can use the “Translation Editor”.
1. Right click on the res directory to open the translation editor.
2. Select “Show All Keys” selector, and choose “Filter by Text”. Supply the name of the resource that you want to delete.
3. Select the resource, and click on the “-” button

Answers:

To identify all unused resources:

Open Menu > Analyze > Run Inspection by Name…
Select “Unused Resources”
Make sure Whole project is checked, then press OK.
Look through the list. You can always rerun the Inspection with the Rerun button.

There is no really easy way in Android Studio (v 1.0) to remove a resource string for all locales. However, you can search and replace in files. Fortunately, the translation files use only a single line in most cases so this works pretty well.

In Android Studio:

Start with no changes pending in your source control (makes it way easier to check and back out if this goes wrong).
Open Menu > Edit > Find > Replace in Path…
In Text to find: .*name='obsoletestring'.*n
In Replace with: (empty)
Check Regular expression
Press the Find button.
Inspect the results. If okay, press the “All files” button.
You will probably have to remove the comment in res/values/strings.xml manually.
Make sure your project still builds.
Take a look at the diff of your project in your source control to ensure the change is really what you intended…

Answers:

Until IDE support comes along, something along these lines will work:

Answers:

In Android Studio 2.3 it’s possible to remove all unused resources.

Open any *.xml in your res/values/ directory
Right click on any item’s name
Refactor -> Remove Unused Resources...

Answers:

Unfortunately, You have to do it manually.

Check this answer to understand what exactly should you do to get rid of them using Eclipse

If you are using Android Studio find them in the whole application and also remove manually .. Check this answer

Answers:

Menu -> Analyze -> Run Inspection by Name -> Unused resources
From the results select all string resources that are unused.
- Right-click highlighted rows and choose “Suppress with @SuppressLint(Java) or tools:ignore(XML)”. This will add the attribute tools:ignore to all strings in all string files.
Menu -> Find -> Replace in Path
- Text to find: ^.*?tools:ignore=”UnusedResources”.*?n
- Tick regular expression box
- Use Scope: Custom
  - Open custom scope editor and add pattern: file[app]:src/main/res//strings.xml
- Find
- Etc.

Answers:

In fact, Android Lint should report about the unused resources, but you can also try with this nice plugin.

Answers:

Beware that the REMOVE UNUSED RESOURCES command cannot recognize a programmatically accessed resource as a used resource (such as getIdentifier(..) etc.).
So, if you do access resources that way, it is highly risky to use that command!!

Tags: android, sed, string

In this document

Use the System Log
Work with Breakpoints

How To Find Unused Classes In Android Studio

Run your App in Debug Mode

Figure 1. The Choose Device window enables you to select a physical Android device or a virtual device to debug your app.

To run your app in debug mode, you build an APK signed with a debug key and install it on aphysical Android device or on the Android emulator.To set up an Android device for development, see UsingHardware Devices. For more information about the emulator provided by the Android SDK, seeUsing the Emulator.

To debug your app in Android Studio:

Open your project in Android Studio.
Click Debug in the toolbar.
On the Choose Device window, select a hardware device from the list or choose a virtual device.
Click OK. Your app starts on the selected device.

Figure 1 shows the Choose Device window. The list shows all the Android devicesconnected to your computer. Select Launch Emulator to use an Android virtual deviceinstead. Click the ellipsis to open theAndroid Virtual Device Manager.

Android Studio opens the Debug tool window when you debug your app. To open theDebug window manually, click Debug.This window shows threads and variables in the Debugger tab, the device status in theConsole tab, and the system log in the Logcat tab. The Debug toolwindow also provides other debugging tools covered in the following sections.

Figure 2. The Debug tool window in Android Studio showingthe current thread and the object tree for a variable.

Use the System Log

The system log shows system messages while you debug your app. These messages includeinformation from apps running on the device. If you want to use thesystem log to debug your app, make sure your code writes log messages and prints the stacktrace for exceptions while your app is in the development phase.

Write log messages in your code

To write log messages in your code, use the Log class. Log messageshelp you understand the execution flow by collecting the system debug output while you interactwith your app. Log messages can tell you what part of your application failed. For moreinformation about logging, see Reading and Writing Logs.

The following example shows how you might add log messages to determine if previous stateinformation is available when your activity starts:

During development, your code can also catch exceptions and write the stack trace to the systemlog:

Note: Remove debug log messages and stack trace print calls fromyour code when you are ready to publish your app. You could do this by setting a DEBUGflag and placing debug log messages inside conditional statements.

View the system log

Both the Android DDMS (Dalvik Debug Monitor Server) and the Debug tool windowsshow the system log; however, the Android DDMS tool window lets you view only log messagesfor a particular process. To view the system log on the Android DDMS tool window:

Start your app as described in Run your App in Debug Mode.
Click Android to open the Android DDMS tool window.
If the system log is empty in the Logcat view, click Restart .

Figure 4. The system log in the Android DDMS toolwindow.

The Android DDMS tool window gives you access to some DDMS features from Android Studio.For more information about DDMS, see Using DDMS.

The system log shows messages from Android services and other Android apps. To filter the logmessages to view only the ones you are interested in, use the tools in the Android DDMSwindow:

To show only log messages for a particular process, select the process in the Devices view and then click Only Show Logcat from Selected Process . If the Devices view is not available, click Restore Devices View on the right of the Android DDMS tool window. This button is only visible when you hide the Devices window.
To filter log messages by log level, select a level under Log Level on the top of the Android DDMS window.
To show only log messages that contain a particular string, enter the string in the search box and press Enter.

Work with Breakpoints

Breakpoints enable you to pause the execution of your app at a particular line of code, examinevariables, evaluate expressions, and continue the execution line by line. Use breakpoints todetermine the causes of run-time errors that you can't fix by looking at your code only. To debugyour app using breakpoints:

Open the source file in which you want to set a breakpoint.
Locate the line where you want to set a breakpoint and click on it.
Click on the yellow portion of the side bar to the left of this line, as shown in figure 5.
Start your app as described in Run your App in Debug Mode.

Android Studio pauses the execution of your app when it reaches the breakpoint. You can thenuse the tools in the Debug tool window to identify the cause of the error.

Figure 5. A red dot appears next to the line when you seta breakpoint.

View and configure breakpoints

To view all the breakpoints and configure breakpoint settings, click ViewBreakpoints on the left side of the Debug toolwindow. The Breakpoints window appears, as shown in figure 6.

Figure 6. The Breakpoints window lists all the currentbreakpoints and includes behavior settings for each.

The Breakpoints window lets you enable or disable each breakpoint from thelist on the left. If a breakpoint is disabled, Android Studio does not pause your app whenit hits that breakpoint. Select a breakpoint from the list to configure its settings.You can configure a breakpoint to be disabled at first and have the system enable it after adifferent breakpoint is hit. You can also configure whether a breakpoint should be disabled afterit is hit. To set a breakpoint for any exception, select Exception Breakpointsin the list of breakpoints.

Debug your app with breakpoints

After you set breakpoints in your code, click Rerun to start the app again. When a breakpoint ishit, Android Studio pauses the app and highlights the breakpoint in the source code. TheDebug tool window lets you examine variables and control the execution step bystep:

To examine the object tree for a variable, expand it in the Variables view. If the Variables view is not visible, click Restore Variables View .
To evaluate an expression at the current execution point, click Evaluate Expression .
To advance to the next line in the code (without entering a method), click Step Over .
To advance to the first line inside a method call, click Step Into .
To advance to the next line outside the current method, click Step Out .
To continue running the app normally, click Resume Program .

Figure 7. The Variables view in the Debug tool window.

Track Object Allocation

Android Studio lets you track objects that are being allocated on the Java heap and see whichclasses and threads are allocating these objects. This allows you to see the list of objectsallocated during a period of interest. This information is valuable for assessing memory usagethat can affect application performance.

To track memory allocation of objects:

Start your app as described in Run Your App in Debug Mode.
Click Android to open the Android DDMStool window.
On the Android DDMS tool window, select the Devices | logcat tab.
Select your device from the dropdown list.
Select your app by its package name from the list of running apps.
Click Start Allocation Tracking
Interact with your app on the device.
Click Stop Allocation Tracking

Android Studio shows the objects that the system allocated with the following information:

Allocation order
Allocated class
Allocation size
Thread ID
Allocation method, class, and line number
Stack trace at the point of allocation

Figure 8. Object allocation tracking in Android Studio.

Analyze Runtime Metrics to Optimize your App

Even if your application does not generate runtime errors, this does not mean it is free ofproblems. You should also consider the following issues:

Does your app use memory efficiently?
Does your app generate unnecessary network traffic?
What methods should you focus your attention on to improve the performance of your app?
Does your app behave properly when the user receives a phone call or a message?

The Android Device Monitor is a stand-alone tool with a graphical user interface for serveralAndroid application debugging and analysis tools, including the Dalvik Debug Monitor Server (DDMS).You can use the Android Device Monitor to analyze memory usage, profile methods,monitor network traffic and simulate incoming calls and messages.

To open the Android Device Monitor from Android Studio, clickMonitor on the toolbar. The Android Device Monitoropens in a new window.

For more information about the Android Device Monitor and DDMS, seeDevice Monitor andUsing DDMS.

Capture Screenshots and Videos

Android Studio enables you to capture a screenshot or a short video of the device screenwhile your app is running. Screenshots and videos are useful as promotional materials for yourapp, and you can also attach them to bug reports that you send to your development team.

To take a screenshot of your app: