Recent questions tagged Android

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android - How to change background color of the snackbar?

I am showing snackbar in a DialogFragment within the positive touch of the alert dialog. Here is my code ... background color to the snackbar. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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android studio 3.0 - Gradle version 3.3 does not support forTask() method on BuildActionExecuter

I just updated my Android Studio to 3.0 canary 1. Now I am working on my existing project on Android ... ) { delete rootProject.buildDir } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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214 views

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android - Converting of Uri to String

Is it possible to convert an Uri to String and vice versa? Because I want to get the the Uri converted ... selected Uri into another activity? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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235 views

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android - package R does not exist

I'm getting the dreaded package R does not exist, it's killing me. The code is fine I have apps in the ... R. supposed to correspond to R.java See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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525 views

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android - How to set radio button checked as default in radiogroup?

I have created RadioGroup and RadioButton dynamically as following: RadioGroup radioGroup = new RadioGroup(context); ... solve this problem? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.3k views

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android - No Creators, like default construct, exist): cannot deserialize from Object value (no delegate- or property-based Creator

I am trying to consume an API using Retrofit and Jackson to deserialize. I am getting the onFailure error No ... - or property-based Creator. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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183 views

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android - How to determine the version of Gradle?

How can I know which version of Gradle I am using in my Android Studio? Please guide. I want to make sure I am using Gradle version 2.2.1. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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225 views

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android - Different values between sensors TYPE_ACCELEROMETER/TYPE_MAGNETIC_FIELD and TYPE_ORIENTATION

There are 2 ways to get the 3 rotation values (azimuth, pitch, roll). One is registering a listener of a ... I'm doing something wrong? Thanks. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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729 views

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android - Read data from NFC tag (IsoDep)

I am newbie in Android NFC API. Currently, I have a NFC tag, I am making an Android app to read data from ... guide me on how to configure :) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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185 views

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android - How to update some data in a Listview without using notifyDataSetChanged()?

I'm trying to create a ListView with a list of downloading tasks. The downloading tasks are managed in a Service ( ... }); return v; } } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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214 views

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android - Protecting in-app purchases from Freedom Hack

I've throughtoutly searched this site as well as others for answers and found no actual one. My question is what ... server wouldn't help much. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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417 views

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android - get duration of audio file

I have made a voice recorder app, and I want to show the duration of the recordings in a listview. I save the ... () method so it returned 0. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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195 views

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android - the differences between createRfcommSocketToServiceRecord and createRfcommSocket

What are the differences between these two ways below connecting to a bluetooth Device: 1) UUID uuid = UUID ... device without using uuid? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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301 views

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android - Activity's onDestroy / Fragment's onDestroyView set Null practices

I am reading ListFragment source code and I see this implementation: ListAdapter mAdapter; ListView mList; View ... you for your ideas! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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194 views

1 answer

android - How to mimic the Material-design raised button style, even for pre-Lollipop (minus the special effects)?

Google has shown some nice ways that buttons are shown on Lollipop here. I'm talking about both the raised ... tries to mimic it completely. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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202 views

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android drawable from file path

I have a file path String of the form "e:...xxx.jpg" How do I create a drawable from it? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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622 views

1 answer

android - How to add two edit text fields in an alert dialog

I am trying to use an alert dialog to prompt for a username and a password in android. I have found this ... field. What is the problem here? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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192 views

1 answer

android - How to inflate XML-Layout-File correctly inside Custom ViewGroup?

I want to inflate a XML-Layout-File in a custom ViewGroup Class, my Problem is that it produces just a empty ... ,this); } ... } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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221 views

1 answer

android - Add back button to action bar

I have been trying to add a back button to the action bar. I want my view to look like this: I want to add the ... 't work. How can I fix this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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267 views

1 answer

android - What does "multiDexEnabled true" mean?

What is meant by "multiDexEnabled true" in Android gradle. Why do we use this? What is the effect if it is enabled? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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397 views

1 answer

android - getLoaderManager().initLoader() doesn't accept 'this' as argument though the class (ListFragment) implements LoaderManager.LoaderCallbacks<Cursor>

I'm having trouble following a guide on using SQLite in Android. I'm using a ListFragment instead of a ... Thank you for any ideas. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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424 views

1 answer

android - Activity lifecycle - onCreate called on every re-orientation

I have a simple activity that loads a bitmap in onCreate. I find that if I rotate the device I can see ... cause the activity to be recreated? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.2k views

1 answer

android - Cannot resolve symbol AppCompatActivity - Support v7 libraries aren't recognized?

I'm trying to figure out why the heck my Android studio isn't recognizing the AppCompat v7 library correctly. ... and it's really frustrating. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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210 views

1 answer

android - How to include layout inside layout?

How to include layout inside layout in Android? I am creating common layout. I want to include that layout in another page. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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298 views

1 answer

android - How to remove auto focus/keyboard popup of a field when the screen shows up?

I have a screen where the first field is an EditText, and it gains the focus at startup, also popups the ... the input panel is not raised? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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273 views

1 answer

android - Brightness Screen Filter

Does anyone have an idea how to implement an Brightness Screen Filter like the one here: http://www.appbrain.com/ ... figure out how to do it. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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298 views

1 answer

android - Playing video using textureview in recyclerview

I am trying to implement a list with videos like vine or Instagram app. Where they play video plays when list ... create a list like vine app? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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219 views

1 answer

android - Why won't Fragment retain state when screen is rotated?

I've been having some trouble getting some custom DialogPreference subclasses inside a PreferenceFragment to remain visible ... is going on? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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