AutoScrollTextView | android 上下滚动播放与走马灯效果结合

by ronghao Java Version: 1.0.0 License: Apache-2.0

X-Ray Key Features Code Snippets(3)Community Discussions(1)Vulnerabilities Install Support

kandi X-RAY | AutoScrollTextView Summary

AutoScrollTextView is a Java library. AutoScrollTextView has no bugs, it has no vulnerabilities, it has build file available, it has a Permissive License and it has low support. You can download it from GitHub.

AutoScrollTextView

Support

Quality

Security

License

Reuse

Support

AutoScrollTextView has a low active ecosystem.

It has 24 star(s) with 4 fork(s). There are 1 watchers for this library.

It had no major release in the last 12 months.

There are 1 open issues and 5 have been closed. On average issues are closed in 63 days. There are no pull requests.

It has a neutral sentiment in the developer community.

The latest version of AutoScrollTextView is 1.0.0

Quality

AutoScrollTextView has 0 bugs and 0 code smells.

Security

AutoScrollTextView has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

AutoScrollTextView code analysis shows 0 unresolved vulnerabilities.

There are 0 security hotspots that need review.

License

AutoScrollTextView is licensed under the Apache-2.0 License. This license is Permissive.

Permissive licenses have the least restrictions, and you can use them in most projects.

Reuse

AutoScrollTextView releases are available to install and integrate.

Build file is available. You can build the component from source.

Installation instructions are not available. Examples and code snippets are available.

AutoScrollTextView saves you 207 person hours of effort in developing the same functionality from scratch.

It has 509 lines of code, 38 functions and 15 files.

It has medium code complexity. Code complexity directly impacts maintainability of the code.

Top functions reviewed by kandi - BETA

kandi has reviewed AutoScrollTextView and discovered the below as its top functions. This is intended to give you an instant insight into AutoScrollTextView implemented functionality, and help decide if they suit your requirements.

Called when the activity is created
Init marguee
Initialize Marguee text
Stop the text view
Start scroll
Stops the future
Resets the scroll position
Implement onDraw method
Calculate the text width
On createView
Set up widgets
Makes the view
Set the marquee listener
Sets the text to the next view
Set the current text to the next view
Adds a view to the adapter
Stop scrolling
Initializes the view
Creates a text view with the accent color
Start scrolling
Initializes the UI
Returns class name of accessibility class

Get all kandi verified functions for this library.

AutoScrollTextView Key Features

No Key Features are available at this moment for AutoScrollTextView.

AutoScrollTextView Examples and Code Snippets

License

Java

Lines of Code : 13

License : Permissive (Apache-2.0)

Copy

Copyright 2016 haohaohu

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless r

项目添加方法

Java

Lines of Code : 9

License : Permissive (Apache-2.0)

Copy

allprojects {
	repositories {
		...
		maven { url 'https://jitpack.io' }
	}
}

dependencies {
    compile 'com.github.ronghao:AutoScrollTextView:1.0.3'
}

自定义文本样式

Java

Lines of Code : 6

License : Permissive (Apache-2.0)

Copy

@Override
public MarqueeTextView makeTextView() {
    MarqueeTextView textView = new MarqueeTextView(getContext());
    textView.setTextColor(getResources().getColor(R.color.colorAccent));
    return textView;
}

Community Discussions

Trending Discussions on AutoScrollTextView

TextView in ViewPager fragments randomly crashes the app NullPointerException: Attempt to invoke virtual method void View.sendAccessibilityEventUnchec

QUESTION

TextView in ViewPager fragments randomly crashes the app NullPointerException: Attempt to invoke virtual method void View.sendAccessibilityEventUnchec

Asked 2020-Apr-07 at 09:45

Summary

First I describe the context, i.e. what I'm trying to do
Second I explain you in which cases I encounter the bug and what is it (it's the current behavior)
Third, I explain you the expected behavior
Then I explain you how to reproduce the bug
Finally I show you the minimal and executable code that can lead to the bug

Context

I am using the widget AutoScrollTextView available between others in the API https://github.com/ronghao/AutoScrollTextView. AutoScrollTextView is a TextView that can automatically autoscroll vertically and moreover, if the text is too long, horizontally. So an AutoScrollTextView can contain at least one text to be automatically scrolled (see the illustration in the GitHub repository).

Current behavior: the error

If I use one AutoScrollTextView in the main activity, I don't see any bug. If I use it in the fragment of the main activity, I think it would be the case too (I didn't test it).
If I use one AutoScrollTextView in each of at least two fragments of a ViewPager (2 instances of this same fragment class are used for the Viewpager), with at least one text to be automatically scrolled by each AutoScrollTextView, the app crashes with the following error (NB: this ViewPager belongs to the main activity):

E/AndroidRuntime: FATAL EXCEPTION: main Process: com.example.myapplication, PID: 2814 java.lang.NullPointerException: Attempt to invoke virtual method 'void android.view.View.sendAccessibilityEventUnchecked(android.view.accessibility.AccessibilityEvent)' on a null object reference at android.view.ViewRootImpl$SendWindowContentChangedAccessibilityEvent.run(ViewRootImpl.java:9304) at android.os.Handler.handleCallback(Handler.java:789) at android.os.Handler.dispatchMessage(Handler.java:98) at android.os.Looper.loop(Looper.java:164) at android.app.ActivityThread.main(ActivityThread.java:6944) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374)

The error, however, is difficult to trigger:

Sometimes, it's triggered as soon as the fragment of the main activity is started
Sometimes, there is a random delay before it's triggered in the fragment of the main activity
Sometimes, maybe it's not triggered (or I close the app before it would)

As you can see, there isn't any indication of the line that causes this crash.

What I've done to debug

I have taken the library, and isolated the minimal part of it that lead to this bug.
I have set up the minimal executable app with only the main activity, the ViewPager, and the fragment (2 instances of this same fragment class are used for the Viewpager).
I have set up this minimal executable app with the isolated part of the library. You will find the sources below (even if there are "many" files, each one has been minimalized and contains only the strict minimal lines in order to make you able to reproduce the bug). Also: with the sources I give you, it's totally normal that you don't see text scrolling (nor text at all). It's because I've completely isolated the part of the API that triggers the bug, and the scrolling text wasn't related to this error, so it's not part of my isolated sources.
I have tried to use Android's Timer instead of an Handler but the error still occurres.
MarqueeTextView::scrollTo(currentScrollPos, 0); seems to trigger this error.

Expected behavior

Normally, the app of course should not crash. In other words, there shouldn't be any triggered error (especially the one I've quoted above). With the sources I give you, it's totally normal that you don't see text scrolling (nor text at all). It's because I've completely isolated the part of the API that triggers the bug, and the scrolling text wasn't related to this error, so it's not part of my isolated sources.

How to reproduce this bug

Below, I provide you all the minimal and executable sources you need (even if there are "many" files, each one has been minimalized and contains only the strict minimal lines in order to make you able to reproduce the bug). After having created the corresponding files and copy/paste these sources in them, run this minimal and executable app several times. Even if the error will or won't be shown for each run, normally you would see it at least one time after 5 runs max. You can use your smartphone to test this app, or maybe an Android Studio's emulator (but I didn't test on an emulator).

NB: with the sources I give you, it's totally normal that you don't see text scrolling (nor text at all). It's because I've completely isolated the part of the API that triggers the bug, and the scrolling text wasn't related to this error, so it's not part of my isolated sources.

My question

Could you tell me why this bug occures (I was unable to debug it) and why it seems so random? How could I correct it?

Minimal and executable app's sources Short presentation

First, I will give you the sources of the isolated part of the library
Then, I will give you the sources of the app with the ViewPager, etc.
Even if there are "many" files, each one has been minimalized and contains only the strict minimal lines in order to make you able to reproduce the bug. With the sources I give you, it's totally normal that you don't see text scrolling (nor text at all). It's because I've completely isolated the part of the API that triggers the bug, and the scrolling text wasn't related to this error, so it's not part of my isolated sources.

Isolated part of the library that triggers the bug com.example.myapplication.libs.autoscrolling_text_view.MarqueeTextView.java ...

ANSWER

Answered 2020-Apr-07 at 09:45

I think I have solved the problem by using runOnUiThread in the method MarqueeTextView::TimerTask::run. Since this change, I didn't see any bug. But I still don't know why this bug occurred, and why this modification solved it (I know it's better to use runOnUiThread in this situation since scrollTo is used, but I don't know what is the relationship between this call and the bug). If someone could comment my answer, to explain me, please :-) .

You can compare the changes (presented below) with the original file in my question.

So the only changes I've made are contained in the following file (com.example.myapplication.libs.autoscrolling_text_view.MarqueeTextView):

Source https://stackoverflow.com/questions/61061130

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install AutoScrollTextView

You can download it from GitHub.
You can use AutoScrollTextView like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the AutoScrollTextView component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .

Support

For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .

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