Develop Reference

java.lang.ClassCastException: android.view.ViewGroup$LayoutParams cannot be cast to android.widget.LinearLayout$LayoutParams android 4.1.2

I have this Exception only on some devices on android 4.1.2. So, I want to know what is the problem it can be.
Here is stack trace - no one line from my code, only from SDK - exception happens in SDK, so no lines were missed:
java.lang.ClassCastException: android.view.ViewGroup$LayoutParams cannot be cast to
android.widget.LinearLayout$LayoutParams
at android.widget.LinearLayout.measureHorizontal(LinearLayout.java:996)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:576)
at android.view.View.measure(View.java:15563)
at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:617)
at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:399)
at android.view.View.measure(View.java:15563)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5112)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
at android.view.View.measure(View.java:15563)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5112)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1396)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:681)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:574)
at android.view.View.measure(View.java:15563)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5112)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2423)
at android.view.View.measure(View.java:15563)
at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2003)
at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1242)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1417)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1135)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4653)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:725)
at android.view.Choreographer.doCallbacks(Choreographer.java:555)
at android.view.Choreographer.doFrame(Choreographer.java:525)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:711)
at android.os.Handler.handleCallback(Handler.java:615)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4944)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1038)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:805)
at dalvik.system.NativeStart.main(Native Method)

In your code you are importing import android.widget.LinearLayout.LayoutParams instead of android.view.ViewGroup.LayoutParams;
so Delete import android.widget.LinearLayout.LayoutParams;
and Add import android.view.ViewGroup.LayoutParams;

Android drawable lookup issue

I'm experiencing an odd behaviour in my Android app. I have a drawable , walkthrough_safe.png and have a version in drawable-mdpi, drawable-hdpi and drawable-xhdpi folders.
I'm seeing this crash in analytics
{main} android.view.InflateException: Binary XML file line #7: Error inflating class
<unknown> at android.view.LayoutInflater.createView(LayoutInflater.java:613) at
com.android.internal.policy.impl.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:
56) at android.view.LayoutInflater.onCreateView(LayoutInflater.java:660) at
android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:685) at
android.view.LayoutInflater.rInflate(LayoutInflater.java:746) at
android.view.LayoutInflater.inflate(LayoutInflater.java:489) at
android.view.LayoutInflater.inflate(LayoutInflater.java:396) at
com.a.b.activity.WalkThroughLoginActivity$WalkthroughFragment.onCreateView(WalkThroughLoginA
ctivity.java:247) at android.support.v4.app.Fragment.performCreateView(Fragment.java:1504)
at android.support.v4.app.y.a(FragmentManager.java:942) at
android.support.v4.app.y.a(FragmentManager.java:1121) at
android.support.v4.app.l.run(BackStackRecord.java:682) at
android.support.v4.app.y.d(FragmentManager.java:1484) at
android.support.v4.app.y.b(FragmentManager.java:482) at
android.support.v4.app.ad.finishUpdate(FragmentPagerAdapter.java:141) at
android.support.v4.view.ViewPager.a(ViewPager.java:1073) at
android.support.v4.view.ViewPager.b(ViewPager.java:919) at
android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1441) at
android.view.View.measure(View.java:15264) at
android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:617) at
android.widget.RelativeLayout.onMeasure(RelativeLayout.java:399) at
android.view.View.measure(View.java:15264) at
android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4916) at
android.widget.FrameLayout.onMeasure(FrameLayout.java:310) at
android.view.View.measure(View.java:15264) at
android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4916) at
android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1390) at
android.widget.LinearLayout.measureVertical(LinearLayout.java:681) at
android.widget.LinearLayout.onMeasure(LinearLayout.java:574) at
android.view.View.measure(View.java:15264) at
android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4916) at
android.widget.FrameLayout.onMeasure(FrameLayout.java:310) at
android.view.View.measure(View.java:15264) at
android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4916) at
android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1390) at
android.widget.LinearLayout.measureVertical(LinearLayout.java:681) at
android.widget.LinearLayout.onMeasure(LinearLayout.java:574) at
android.view.View.measure(View.java:15264) at
android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4916) at
android.widget.FrameLayout.onMeasure(FrameLayout.java:310) at
com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2339) at
android.view.View.measure(View.java:15264) at
android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2131) at
android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1242) at
android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1435) at
android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1127) at
android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4606) at
android.view.Choreographer$CallbackRecord.run(Choreographer.java:747) at
android.view.Choreographer.doCallbacks(Choreographer.java:567) at
android.view.Choreographer.doFrame(Choreographer.java:536) at
android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:733) at
android.os.Handler.handleCallback(Handler.java:615) at
android.os.Handler.dispatchMessage(Handler.java:92) at
android.os.Looper.loop(Looper.java:153) at
android.app.ActivityThread.main(ActivityThread.java:5006) at
java.lang.reflect.Method.invokeNative(Native Method) at
java.lang.reflect.Method.invoke(Method.java:511) at
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:821) at
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:584) at
dalvik.system.NativeStart.main(Native Method) Caused by:
java.lang.reflect.InvocationTargetException at
java.lang.reflect.Constructor.constructNative(Native Method) at
java.lang.reflect.Constructor.newInstance(Constructor.java:417) at
android.view.LayoutInflater.createView(LayoutInflater.java:587) ... 59 more Caused by:
android.content.res.Resources$NotFoundException: File res/drawable-mdpi-
v4/walkthrough_safe.png from drawable resource ID #0x7f02015c at
android.content.res.Resources.loadDrawable(Resources.java:2054) at
android.content.res.TypedArray.getDrawable(TypedArray.java:601) at android.widget.ImageView.
<init>(ImageView.java:120) at android.widget.ImageView.<init>(ImageView.java:110) ... 62
more Caused by: java.io.FileNotFoundException: res/drawable-mdpi-v4/walkthrough_safe.png at
android.content.res.AssetManager.openNonAssetNative(Native Method) at
android.content.res.AssetManager.openNonAsset(AssetManager.java:410) at
android.content.res.Resources.loadDrawable(Resources.java:2046) ... 65 more
In the line WalkThroughLoginActivity.java:247 I have this:
inflater.inflate(R.layout.fragment_login_walkthrough_2,
container, false);
And this is the layout file for fragment_login_walkthrough_2.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<ImageView
style="#style/icon_walkthrough"
android:src="#drawable/walkthrough_safe" />
<TextView
style="#style/title_walkthrough"
android:layout_marginTop="#dimen/margin_walktrough_title"
android:text="#string/walkthrough2_title" />
<TextView
style="#style/text_walkthrough"
android:text="#string/walkthrough2_subtitle"/>
</LinearLayout>
Please correctly if I'm wrong but it seems to me that android is looking up for my drawable in the wrong folder (drawable-mdpi-v4), which obvioulsy does not exist. Not only that, after not finding it, it is not falling back to a more general folder, such us drawable-mdpi.
Have I missed something?

Android: Having force close when accessing the media store

I seems to receive a force close when turning off the phone and turning back on and when I on to the application which require to load the photos with media store , it force close. It has no problem when I wait for awhile before going to the application. Do I need to check anything before using the media store.
The error below may or may not related I don't actually sure.
Log
java.lang.IllegalStateException: couldn't move cursor to position 0
at android.widget.CursorAdapter.getView(CursorAdapter.java:242)
at android.widget.AbsListView.obtainView(AbsListView.java:2472)
at android.widget.GridView.onMeasure(GridView.java:1030)
at android.view.View.measure(View.java:15563)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5112)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1396)
at android.widget.LinearLayout.measureHorizontal(LinearLayout.java:1038)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:576)
at android.view.View.measure(View.java:15563)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5112)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1396)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:681)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:574)
at android.view.View.measure(View.java:15563)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5112)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
at android.view.View.measure(View.java:15563)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5112)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1396)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:681)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:574)
at android.view.View.measure(View.java:15563)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5112)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2411)
at android.view.View.measure(View.java:15563)
at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2003)
at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1242)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1417)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1135)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4652)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:725)
at android.view.Choreographer.doCallbacks(Choreographer.java:555)
at android.view.Choreographer.doFrame(Choreographer.java:525)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:711)
at android.os.Handler.handleCallback(Handler.java:615)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4944)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1038)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:805)
at dalvik.system.NativeStart.main(Native Method)

how to use custom ImageView

I have found the following code on how to get display height and width from ImageView: Trying to get the display size of an image in an ImageView . When I try to use it in the layout snippet below, I get following error.
<com.mycompany.widget.SizeAwareImageView
android:id="#+id/account_profile_img"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:background="#drawable/avatar"
android:clickable="true"
android:gravity="bottom|center_horizontal"
android:onClick="onEditPhotoClicked" />
ERROR:
FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.company.myapp/com.company.myapp.RegisterActivity}: android.view.InflateException: Binary XML file line #218: Error inflating class com.company.myapp.widget.SizeAwareImageView
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2247)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2297)
at android.app.ActivityThread.access$700(ActivityThread.java:152)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1282)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5328)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869)
at dalvik.system.NativeStart.main(Native Method)
Caused by: android.view.InflateException: Binary XML file line #218: Error inflating class com.company.myapp.widget.SizeAwareImageView
at android.view.LayoutInflater.createView(LayoutInflater.java:602)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:693)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:752)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:760)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:760)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:760)
at android.view.LayoutInflater.inflate(LayoutInflater.java:495)
at android.view.LayoutInflater.inflate(LayoutInflater.java:397)
at android.view.LayoutInflater.inflate(LayoutInflater.java:353)
at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:327)
at android.app.Activity.setContentView(Activity.java:1928)
at com.company.myapp.RegisterActivity.onCreate(RegisterActivity.java:63)
at android.app.Activity.performCreate(Activity.java:5250)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1097)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2211)
... 11 more
Caused by: java.lang.NoSuchMethodException: <init> [class android.content.Context, interface android.util.AttributeSet]
at java.lang.Class.getConstructorOrMethod(Class.java:460)
at java.lang.Class.getConstructor(Class.java:431)
at android.view.LayoutInflater.createView(LayoutInflater.java:567)
... 25 more
UPDATE
From the graphics Layout I also get the error
java.lang.NullPointerException
Exception details are logged in Window > Show View > Error Log
java.lang.NullPointerException
at com.company.myapp.widget.SizeAwareImageView.onMeasure(SizeAwareImageView.java:66)
at android.view.View.measure(View.java:15848)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5008)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404)
at android.widget.LinearLayout.measureHorizontal(LinearLayout.java:1052)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:590)
at android.view.View.measure(View.java:15848)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5008)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:695)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
at android.view.View.measure(View.java:15848)
at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:728)
at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:477)
at android.view.View.measure(View.java:15848)
at android.widget.ScrollView.measureChildWithMargins(ScrollView.java:1217)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
at android.widget.ScrollView.onMeasure(ScrollView.java:321)
at android.view.View.measure(View.java:15848)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5008)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
at android.view.View.measure(View.java:15848)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5008)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:695)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
at android.view.View.measure(View.java:15848)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5008)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:695)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
at android.view.View.measure(View.java:15848)
SECOND UPDATE
the errored line in question is the second of
final Drawable d = getDrawable();
final int origW = d.getIntrinsicWidth();
final int origH = d.getIntrinsicHeight();
The complete code is here on stack overflow at Trying to get the display size of an image in an ImageView . It's the response with the most votes.

Make sure you have provided the right constructor for the XML. Your custom Views constructor should have the following method signature:
public SizeAwareImageView(Context context, AttributeSet attrs){
// todo
}
I'm guessing it currently looks like this:
public SizeAwareImageView(Context context){
// todo
}
Also I'd double check you meant to set the XML parameter android:background, for ImageView you actually set android:src.

Exception with Android WebView

I have this exception:
java.lang.NullPointerException
at android.webkit.WebViewClassic.requestFocus(WebViewClassic.java:10003)
at android.webkit.WebView.requestFocus(WebView.java:2133)
at android.view.ViewGroup.onRequestFocusInDescendants(ViewGroup.java:2382)
at android.view.ViewGroup.requestFocus(ViewGroup.java:2338)
at android.view.ViewGroup.onRequestFocusInDescendants(ViewGroup.java:2382)
at android.view.ViewGroup.requestFocus(ViewGroup.java:2338)
at android.view.ViewGroup.onRequestFocusInDescendants(ViewGroup.java:2382)
at android.view.ViewGroup.requestFocus(ViewGroup.java:2341)
at android.view.View.requestFocus(View.java:6538)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1899)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1110)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4472)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:725)
at android.view.Choreographer.doCallbacks(Choreographer.java:555)
at android.view.Choreographer.doFrame(Choreographer.java:525)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:711)
at android.os.Handler.handleCallback(Handler.java:615)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4918)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1004)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:771)
at dalvik.system.NativeStart.main(Native Method)
But it doesn't tell me what line it happened on or anything else. Any idea how to debug this?
Thanks,
Alex