Develop Reference

my app crashes when i try to set default drawable as MenuItem Icon inside Glide's onLoadFailed method

Fatal Exception: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Object android.util.SparseArray.valueAt(int)' on a null object reference
at android.graphics.drawable.DrawableContainer$DrawableContainerState.createAllFutures(DrawableContainer.java:879)
at android.graphics.drawable.DrawableContainer$DrawableContainerState.getOpacity(DrawableContainer.java:1163)
at android.graphics.drawable.DrawableContainer.getOpacity(DrawableContainer.java:434)
at android.widget.ImageView.isOpaque(ImageView.java:1645)
at android.view.View.invalidateInternal(View.java:18603)
at android.view.View.invalidate(View.java:18582)
at android.view.View.invalidate(View.java:18564)
at android.widget.ImageView.setImageDrawable(ImageView.java:599)
at androidx.appcompat.widget.AppCompatImageView.setImageDrawable(AppCompatImageView.java:104)
at com.google.android.material.bottomnavigation.BottomNavigationItemView.setIcon(BottomNavigationItemView.java:408)
at com.google.android.material.bottomnavigation.BottomNavigationItemView.initialize(BottomNavigationItemView.java:146)
at com.google.android.material.bottomnavigation.BottomNavigationMenuView.updateMenuView(BottomNavigationMenuView.java:626)
at com.google.android.material.bottomnavigation.BottomNavigationPresenter.updateMenuView(BottomNavigationPresenter.java:69)
at androidx.appcompat.view.menu.MenuBuilder.dispatchPresenterUpdate(MenuBuilder.java:292)
at androidx.appcompat.view.menu.MenuBuilder.onItemsChanged(MenuBuilder.java:1063)
at androidx.appcompat.view.menu.MenuItemImpl.setIcon(MenuItemImpl.java:519)
at com.risor.ui.home.MainActivity$setUpProfileAvatar$1$onLoadFailed$1.run(MainActivity.kt:303)
at android.os.Handler.handleCallback(Handler.java:938)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:223)
at android.app.ActivityThread.main(ActivityThread.java:7948)
at java.lang.reflect.Method.invoke(Method.java)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:603)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)

Calling onSaveInstanceState on Activity

I inherited a project, trying to understand and solve an old bug.
When I start an activity and let it sit for a bit (sometimes it's almost immediate), but it appears to go into a pause state or something and attempts to reload the activity and gets an error.
"Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String ... ' on a null object reference"
I found that when I add this to my activity:
#Override
public void onSaveInstanceState(Bundle savedInstanceState)
{
//super.onSaveInstanceState(savedInstanceState);
}
It appears to work perfectly.
However, when I uncomment the line above to super.onSaveInstanceState(savedInstanceState);, I get the error again.
My activity is extending the ActionBarActivity, if that is helpful.
Any help would be appreciated. Thank you!
Related Code:
#Override
protected void prepareLayout() {
textMessage = (TextView) findViewById(R.id.textMessage);
textNotes = (EditText) findViewById(R.id.textNotes);
textMessage.setText(getOneOfMyItems().getText());
// ... the above line is where the problem error is thrown.
}
Stack Trace:
Process: com.myproj.myproj, PID: 9272
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.myproj.myproj/com.myproj.activities.MyActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String com.myproj.data.MyItems.getText()' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3288)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3384)
at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:5433)
at android.app.ActivityThread.access$1200(ActivityThread.java:226)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1810)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:7270)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String com.myproj.data.MyItems.getText()' on a null object reference
at com.myproj.xyz.MyFragment.prepareLayout(MyFragment.java:44)
at com.myproj.fragments.BaseFragment.prepareAndSetView(BaseFragment.java:49)
at at com.myproj.xyz.BaseMyFragment.onCreateView(BaseMyFragment.java:21)
at android.support.v4.app.Fragment.performCreateView(Fragment.java:2074)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1104)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1286)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1268)
at android.support.v4.app.FragmentManagerImpl.dispatchActivityCreated(FragmentManager.java:2143)
at android.support.v4.app.Fragment.performActivityCreated(Fragment.java:2089)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1129)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1286)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1268)
at android.support.v4.app.FragmentManagerImpl.dispatchActivityCreated(FragmentManager.java:2143)
at android.support.v4.app.FragmentController.dispatchActivityCreated(FragmentController.java:201)
at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:615)
at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1266)
at android.app.Activity.performStart(Activity.java:6943)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3245)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3384) 
at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:5433) 
at android.app.ActivityThread.access$1200(ActivityThread.java:226) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1810) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:148) 
at android.app.ActivityThread.main(ActivityThread.java:7270) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120) 

unfortunately ___ has stopped , but logcat contains many errors

i have developped an application android that contains two activities , the first activity contains two Edittext and a login button , i have to enter the value 'abcd' as a username and 'EFGH' as a password and validate with the button , the probleme is when i clicked login the application has crashed ,
the error message is : unfortunately ___ is stopped
logcat: errors 11-15 19:22:56.237 783-783/? E/Zygote: accessInfo : 0
11-15 19:24:41.057 783-783/info.adem.tplogin E/AndroidRuntime: FATAL
EXCEPTION: main
Process: info.adem.tplogin, PID: 783
java.lang.RuntimeException: Unable to start activity
ComponentInfo{info.adem.tplogin/info.adem.tplogin.FriendActivity}:
java.lang.NullPointerException: Attempt to invoke virtual method 'void
android.widget.Button.setOnClickListener(android.view.View$OnClickListener)'
on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3253)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3349)
at android.app.ActivityThread.access$1100(ActivityThread.java:221)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1794)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:158)
at android.app.ActivityThread.main(ActivityThread.java:7224)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method
'void
android.widget.Button.setOnClickListener(android.view.View$OnClickListener)'
on a null object reference
at info.adem.tplogin.FriendActivity.onCreate(FriendActivity.java:27)
at android.app.Activity.performCreate(Activity.java:6876)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1135)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3206)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3349) 
at android.app.ActivityThread.access$1100(ActivityThread.java:221) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1794) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:158) 
at android.app.ActivityThread.main(ActivityThread.java:7224) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)

java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object
Before you use a reference from your button to add an event, you need to retrieve the reference from it.
Like this:
public class YourActivity extends AppCompatActivity{
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_your_layout)
Button button = (Button)findViewById(R.id.your_button_id)
//button.setOnClickListener........
}
}

android.content.res.Resources android.content.Context.getResources() error when using github repository

I am using https://github.com/BlacKCaT27/CurrencyEditText to enter currency into my application and I am using this code:
CurrencyEditText cet = new CurrencyEditText(this, null);
Here is the logcat:
Process: com.dharquissandas.budget, PID: 17620
java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.dharquissandas.budget/com.dharquissandas.budget.add_expense}: java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.res.Resources android.content.Context.getResources()' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2819)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2988)
at android.app.ActivityThread.-wrap14(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1631)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6682)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1520)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1410)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.res.Resources android.content.Context.getResources()' on a null object reference
at android.content.ContextWrapper.getResources(ContextWrapper.java:86)
at android.view.ContextThemeWrapper.getResourcesInternal(ContextThemeWrapper.java:127)
at android.view.ContextThemeWrapper.getResources(ContextThemeWrapper.java:121)
at android.support.v7.app.AppCompatActivity.getResources(AppCompatActivity.java:542)
at android.view.View.<init>(View.java:4306)
at android.view.View.<init>(View.java:4454)
at android.widget.TextView.<init>(TextView.java:995)
at android.widget.EditText.<init>(EditText.java:79)
at android.widget.EditText.<init>(EditText.java:75)
at android.widget.EditText.<init>(EditText.java:71)
at com.blackcat.currencyedittext.CurrencyEditText.<init>(CurrencyEditText.java:33)
at com.dharquissandas.budget.add_expense.<init>(add_expense.java:29)
at java.lang.Class.newInstance(Native Method)
at android.app.Instrumentation.newActivity(Instrumentation.java:1086)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2809)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2988) 
at android.app.ActivityThread.-wrap14(ActivityThread.java) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1631) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:154) 
at android.app.ActivityThread.main(ActivityThread.java:6682) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1520) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1410) 
What am I doing wrong I don't know, I am fairly new to android programming can someone help me out. What am I supposed to put in the attribute part of the code?
Here is my code: https://pastebin.com/57mTUMWX

You should not be creating view elements in your Code.
Add the view for CurrencyText to your XML.
Then you make sure it has an #+id/myName and find it by doing
CurrencyText myText = findViewById(R.id.myName);

onPause() crashes when calling mediaplayer.isPlaying()

Okay so I got two audio tracks in the same activity and hence am using two media players for them. I've got everything working fine. The only problem is when calling the onPause() so that the audio track gets paused when activity pauses.
If audio track 1 is playing then on pausing the app crashes because of a null pointer exception due to mediaPlayer2 and the opposite happens when track 2 is playing.
Here's the code from the Activity.java
#Override
protected void onPause() {
super.onPause();
if (mediaPlayer1.isPlaying()) {
mediaPlayer1.pause();
pp1.setImageResource(R.drawable.play);
}
if (mediaPlayer2.isPlaying()) {
mediaPlayer2.pause();
pp2.setImageResource(R.drawable.play);
}
}
And the error(s)
Error 1
java.lang.RuntimeException: Unable to pause activity {com.music.track/com.music.track.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.media.MediaPlayer.isPlaying()' on a null object reference
at android.app.ActivityThread.performPauseActivity(ActivityThread.java:3454)
at android.app.ActivityThread.performPauseActivity(ActivityThread.java:3408)
at android.app.ActivityThread.handlePauseActivity(ActivityThread.java:3383)
at android.app.ActivityThread.access$1100(ActivityThread.java:154)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1391)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:152)
at android.app.ActivityThread.main(ActivityThread.java:5497)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.media.MediaPlayer.isPlaying()' on a null object reference
at com.music.track.MainActivity.onPause(MainActivity.java:186)
at android.app.Activity.performPause(Activity.java:6397)
at android.app.Instrumentation.callActivityOnPause(Instrumentation.java:1380)
at android.app.ActivityThread.performPauseActivity(ActivityThread.java:3435)
at android.app.ActivityThread.performPauseActivity(ActivityThread.java:3408) 
at android.app.ActivityThread.handlePauseActivity(ActivityThread.java:3383) 
at android.app.ActivityThread.access$1100(ActivityThread.java:154) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1391) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:152) 
at android.app.ActivityThread.main(ActivityThread.java:5497)
Error 2
java.lang.RuntimeException: Unable to pause activity {com.music.test/com.music.test.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.media.MediaPlayer.isPlaying()' on a null object reference
at android.app.ActivityThread.performPauseActivity(ActivityThread.java:3454)
at android.app.ActivityThread.performPauseActivity(ActivityThread.java:3408)
at android.app.ActivityThread.handlePauseActivity(ActivityThread.java:3383)
at android.app.ActivityThread.access$1100(ActivityThread.java:154)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1391)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:152)
at android.app.ActivityThread.main(ActivityThread.java:5497)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.media.MediaPlayer.isPlaying()' on a null object reference
at com.music.test.MainActivity.onPause(MainActivity.java:181)
at android.app.Activity.performPause(Activity.java:6397)
at android.app.Instrumentation.callActivityOnPause(Instrumentation.java:1380)
at android.app.ActivityThread.performPauseActivity(ActivityThread.java:3435)
at android.app.ActivityThread.performPauseActivity(ActivityThread.java:3408) 
at android.app.ActivityThread.handlePauseActivity(ActivityThread.java:3383) 
at android.app.ActivityThread.access$1100(ActivityThread.java:154) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1391) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:152) 
at android.app.ActivityThread.main(ActivityThread.java:5497)

Check mediaPlayer1 & 2 for null before using them