App is getting OOM when going to and fro from one activity to other Multiple time

Question

I have an simplest app. in which there is no heavy programming going on. I Have 2 activities and I am going to and fro from one activity to another for Example I am going to Activity2 from Activity1 and then Back to Activity1 from Activity2.

By doing this multiple time I am getting OOM error and app crashes at that time I have no clue why it is happening only by just setting the background image and button in Activity1 and in Activity2 there is only background image, and a image view and a single button

On going back I am destroying Activity2 using onDestroy method also and using this method also in Activity1 but it stills not working to get some memory empty.

Here is the full stacktrace

E/AndroidRuntime: FATAL EXCEPTION: main Process: com.efu.myprojet, PID: 4241 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.efu.myprojet/com.efu.myprojet.MainActivity}: android.view.InflateException: Binary XML file line #1: Error inflating class at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2702) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2767) at android.app.ActivityThread.access$900(ActivityThread.java:177) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1449) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:145) at android.app.ActivityThread.main(ActivityThread.java:5951) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1400) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1195) Caused by: android.view.InflateException: Binary XML file line #1: Error inflating class at android.view.LayoutInflater.createView(LayoutInflater.java:640) at com.android.internal.policy.impl.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:55) at android.view.LayoutInflater.onCreateView(LayoutInflater.java:689) at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:748) at android.view.LayoutInflater.inflate(LayoutInflater.java:483) at android.view.LayoutInflater.inflate(LayoutInflater.java:415) at android.view.LayoutInflater.inflate(LayoutInflater.java:366) at android.support.v7.app.AppCompatDelegateImplV7.setContentView(AppCompatDelegateImplV7.java:267) at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:129) at com.efu.myprojet.MainActivity.onCreate(MainActivity.java:69) at android.app.Activity.performCreate(Activity.java:6289) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1119) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2655) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2767)  at android.app.ActivityThread.access$900(ActivityThread.java:177)  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1449)  at android.os.Handler.dispatchMessage(Handler.java:102)  at android.os.Looper.loop(Looper.java:145)  at android.app.ActivityThread.main(ActivityThread.java:5951)  at java.lang.reflect.Method.invoke(Native Method)  at java.lang.reflect.Method.invoke(Method.java:372)  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1400)  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1195)  Caused by: java.lang.reflect.InvocationTargetException at java.lang.reflect.Constructor.newInstance(Native Method) at java.lang.reflect.Constructor.newInstance(Constructor.java:288) at android.view.LayoutInflater.createView(LayoutInflater.java:614) at com.android.internal.policy.impl.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:55)  at android.view.LayoutInflater.onCreateView(LayoutInflater.java:689)  at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:748)  at android.view.LayoutInflater.inflate(LayoutInflater.java:483)  at android.view.LayoutInflater.inflate(LayoutInflater.java:415)  at android.view.LayoutInflater.inflate(LayoutInflater.java:366)  at android.support.v7.app.AppCompatDelegateImplV7.setContentView(AppCompatDelegateImplV7.java:267)  at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:129)  at com.efu.myprojet.MainActivity.onCreate(MainActivity.java:69)  at android.app.Activity.performCreate(Activity.java:6289)  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1119)  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2655)  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2767)  at android.app.ActivityThread.access$900(ActivityThread.java:177)  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1449)  at android.os.Handler.dispatchMessage(Handler.java:102)  at android.os.Looper.loop(Looper.java:145)  at android.app.ActivityThread.main(ActivityThread.java:5951)  at java.lang.reflect.Method.invoke(Native Method)  at java.lang.reflect.Method.invoke(Method.java:372)  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1400)  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1195)  Caused by: java.lang.OutOfMemoryError: Failed to allocate a 9216012 byte allocation with 2044572 free bytes and 1996KB until OOM at dalvik.system.VMRuntime.newNonMovableArray(Native Method) at android.graphics.BitmapFactory.nativeDecodeAsset(Native Method) at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:747) at android.graphics.BitmapFactory.decodeResourceStream(BitmapFactory.java:568) at android.graphics.drawable.Drawable.createFromResourceStream(Drawable.java:1014) at android.content.res.Resources.loadDrawableForCookie(Resources.java:3747) at android.content.res.Resources.loadDrawable(Resources.java:3620) at android.content.res.TypedArray.getDrawable(TypedArray.java:762) at android.view.View.(View.java:3957) at android.view.ViewGroup.(ViewGroup.java:507) at android.widget.RelativeLayout.(RelativeLayout.java:249) at android.widget.RelativeLayout.(RelativeLayout.java:245) at android.widget.RelativeLayout.(RelativeLayout.java:241) at java.lang.reflect.Constructor.newInstance(Native Method)  at java.lang.reflect.Constructor.newInstance(Constructor.java:288)  at android.view.LayoutInflater.createView(LayoutInflater.java:614)  at com.android.internal.policy.impl.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:55)  at android.view.LayoutInflater.onCreateView(LayoutInflater.java:689)  at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:748)  at android.view.LayoutInflater.inflate(LayoutInflater.java:483)  at android.view.LayoutInflater.inflate(LayoutInflater.java:415)  at android.view.LayoutInflater.inflate(LayoutInflater.java:366)  at android.support.v7.app.AppCompatDelegateImplV7.setContentView(AppCompatDelegateImplV7.java:267)  at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:129)  at com.efu.myprojet.MainActivity.onCreate(MainActivity.java:69)  at android.app.Activity.performCreate(Activity.java:6289)  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1119)  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2655)  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2767)  at android.app.ActivityThread.access$900(ActivityThread.java:177)  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1449)  at android.os.Handler.dispatchMessage(Handler.java:102)  at android.os.Looper.loop(Looper.java:145)  at android.app.ActivityThread.main(ActivityThread.java:5951)  at java.lang.reflect.Method.invoke(Native Method)  at java.lang.reflect.Method.invoke(Method.java:372) 

Update 1 :

Adding my xmls Xml of first Activity

    <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.efu.myproject.FirstActivity"
    android:background="@drawable/bg_enter_the_book">


    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_alignParentBottom="true"
        android:id="@+id/lLayout"
        android:padding="10dp">
        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerHorizontal="true"
            android:layout_alignParentBottom="true"
            android:background="@drawable/btn_next"
            android:onClick="EnterTheJungleBookButton"
            android:text="           "
            android:visibility="invisible"
            android:layout_marginBottom="20dp"/>
    </LinearLayout>
</RelativeLayout>

Activity2 Named MainActivity

    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/background"
    tools:context="com.efu.myproject.MainActivity">

       <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerHorizontal="true"
            android:src="@drawable/bg_anim_name"
            android:id="@+id/iv_anim_name"/>

        <TextView
            android:id="@+id/tv_anim_name"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:layout_centerHorizontal="true"
            android:keepScreenOn="true"
            android:text="@string/dummy_content"
            android:textColor="#ffffff"
            android:textSize="@dimen/tv_anim_name"
            android:textStyle="bold"
            android:layout_above="@+id/tv_empty"/>
        <TextView
            android:id="@+id/tv_empty"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:layout_centerHorizontal="true"
            android:keepScreenOn="true"
            android:text="sdasdasd"
            android:visibility="invisible"
            android:textColor="#33b5e5"
            android:textSize="@dimen/tv_empty"
            android:layout_alignBaseline="@+id/iv_anim_name"
            android:layout_alignBottom="@+id/iv_anim_name"
            android:textStyle="bold"
            />
    </RelativeLayout>

    <ImageView
        android:id="@+id/iv_anim_pic"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:maxHeight="@dimen/iv_anim_pic_height"
        android:src="@drawable/ic_launcher" />

    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_gravity="bottom|center_horizontal"
        android:fitsSystemWindows="true">

        <RelativeLayout
            android:id="@+id/fullscreen_content_controls"
            style="?metaButtonBarStyle"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_gravity="bottom|center_horizontal"

            android:orientation="horizontal"
            tools:ignore="UselessParent">

            <Button
                android:id="@+id/btn_next"
                style="?metaButtonBarButtonStyle"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:background="@drawable/btn_next"
                android:layout_alignParentTop="true"
                android:layout_centerHorizontal="true" />

        </RelativeLayout>
    </FrameLayout>

</RelativeLayout>

Also I have a static class which contains the resources of my app and I am retrieving those resources from that static class for example

ivAnimPicture.setImageResource(NextResource.getPicture(anyRandomNum));

here is my that Class which contains resources

    public class NextResource {

    static int[] animPics  =  {R.drawable.anteater,R.drawable.antelope,R.drawable.bear,
            R.drawable.bird,R.drawable.cat,R.drawable.chicken,R.drawable.cow,R.drawable.dog,
            R.drawable.duck,R.drawable.elephant,R.drawable.fox,
            R.drawable.frog,R.drawable.impala,R.drawable.lion,R.drawable.monkey,R.drawable.ostrich,
            R.drawable.panda,R.drawable.penguin,R.drawable.rabbit,
            R.drawable.sheep,R.drawable.tiger,R.drawable.vulture,R.drawable.zebra};

    static  String[] animName  = {"Anteater","Antelope","Bear","Parrot","Cat","Chicken","Cow","Dog",
            "Duck","Elephant","Fox","Frog","Impala","Lion","Monkey","Ostrich",
            "Panda","Penguin","Rabbit","Sheep","Tiger","Vulture","Zebra"};
//    public static int [] animSound = {R.raw.ballon,R.raw.billi,R.raw.carrot,
//            R.raw.fountain,R.raw.horse,R.raw.huka,R.raw.sparrow,R.raw.tea};

    public static int [] animSound = {R.raw.anteater,R.raw.antelope,R.raw.bear,
            R.raw.parrot,R.raw.cat,R.raw.chicken,R.raw.cow,R.raw.dog,
            R.raw.duck,R.raw.elephant,R.raw.fox,
            R.raw.frog,R.raw.impala,R.raw.lion,R.raw.monkey,R.raw.ostrich,
            R.raw.panda,R.raw.penguin,R.raw.fox,
            R.raw.sheep,R.raw.tiger,R.raw.vulture,R.raw.zebra};

    public static int getPicture(int i){

        return animPics[i];
    }
    public static int getSound(int i){

        return animSound[i];
    }

    public static String getName(int i){

        return animName[i];
    }
}

So what shoud I do? Where are my mistakes?

As I am using NextResource Static class to fetch my resources, is it the real reason to gain the memory again and again and not freeing the memory allocation?

Edit2

@Override
protected void onDestroy() {

    if (tts != null) {
        tts.stop();//tts is Text To Speech whcih I am using 
        tts.shutdown();
    }
    ivAnimPicture = null; //this is the Imageview to show random pics
    secureRandom = null; 
    mAccelerometer = null;
    mSensorManager = null;
    mShakeDetector = null;
    tvAnimName = null;
    btnNext = null;
    random = null;
    mediaPlayer = null;
    map = null;

    super.onDestroy();

}

Answer 1

What you describe is the classic scenario of a memory leak.

So start from the beginning, if you don't know what a memory leak is I Googled for it and link here is for the prettiest illustration I could find on the first result page: http://www.programcreek.com/2013/10/the-introduction-of-memory-leak-what-why-and-how/

Unfortunately memory leaks can happen anywhere and even if you share your complete project to us, most wouldn't bother reading it because finding memory leaks is just so damn boring.

Said that there're methods and tools to help you out:

• memory monitor. First things things. You should use the memory monitor on Android Studio to check that it is actually a memory leak. You'll see it happening when memory grows going to a new activity and it doesn't reduces when coming back from it.

• LeakCanary to the rescue. The guys at square did this awesome library to automagically detect memory leaks https://github.com/square/leakcanary it doesn't do ALL the work by itself, but as you point out Activity, it should be pretty straight forward. Just follow whats on their readme.

That should get your started. Happy coding.

edit:

from your onDestroy code I can see you're using accelerometer, sensor manager, shake detector and media player. Those are all stuff that could have reference to the activity and be leaking it. Just calling null doesn't mean, the other side isn't holding your activity.

So all that just re-inforces my original answer: Learn about memory leaks, check memory monitor and use leak canary.

Answer 2

Scale down your background image size. May be you are using too large image. Please refer this and this.

Answer 3

As per the log posted above, this error is occurring because of error inflating in your layout. please check your layout once or post your code to be more clear. Or is there any background task going on in your activity, where you had to load any image?