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This is the second post on Android Property Animation. Previous post can be found below.
– Android Property Animation Overview.
ValueAnimator is the core of the Property Animation system. It provides a timing engine which calculates the animation values. It also allows us to get notified at every animation frame through ValueAnimator.AnimatorUpdateListener interface.
Animation [...]
Property animation is introduced in Android 3.0 Honeycomb. A whole new set of APIs comes with the android.animation package (The view animation is exposed through android.view.animation package), which makes animation in Android more flexible and powerful.
1. Limitation of View Animation System
The property animation system is introduced to tackle the limitations of [...]
This post discusses how to record raw audio (PCM) and save it to wave file on Android. If you’re not familiar with WAVE audio file format, please refer to a previous post, WAVE Audio File Format.
The post is a follow up post for Record PCM Audio on Android. The [...]
This post discusses how to record PCM audio on Android with the android.media.AudioRecord class. If you’re not familiar with PCM, please read a previous post PCM Audio Format.
For the source code, please refer to AndroidPCMRecorder.
1. State Transition
The source code records the PCM audio with PcmAudioRecorder.java, which [...]
Android NDK is a collection of tools and libraries that allow us to develop Android apps in C/C++. This post dissect the latest Android NDK release r8c by providing detailed information about the files and directories.
build: the build tools and scripts
–awk: some awk programs used internally by NDK build system, mainly for [...]
Android NDK comes with a few toolchains under the toolchain directory. We can also build our own toolchain from the source code.
0. Download Latest Android NDK (r8c at the time of writing) from Android NDK website at http://developer.android.com/tools/sdk/ndk/index.html. Extract the downloaded archive.
$ tar xvf android-ndk-r8c-linux-x86.tar.bz2
1. Get into the ndk [...]
There’re times developers want to deploy a NDK library in a separate APK. A typical use case is your library is big and it has different versions for different CPUs/phones. A naive strategy is to put all those libraries in a single huge apk and get lots of user complains. A better approach is [...]
Android DDMS allows one to take screenshot easily by clicking a button. However, sometimes a developer may want to take screenshot from the command line in order to automate it. This post discusses how we can do this and provides a java program at the end.
0. How DDMS Capture Screenshot
When your android app is doing something that user needs to wait, it’s better to tell the user how much has been done and how long user needs to wait. Progress bar comes into handy. Sometimes user goes to other app, but still wants to check out the task your app is doing, then a [...]
The Story Behind
In my recent app, video converter for Android, I add a notification progress report on the status bar. So users can view the video conversion progress any time. I also did several other changes, and then start running the final test before release.
Then I found the [...]
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