Develop Reference

Android Talkback accessibility events

Is there a way to programatically set to read all views on talkback when certain action is fired (ex. button click) like it is when you tap with 3 fingers at once?
Thanks in advance.

Option 1 - if you just want to read some text: Use speech to text
please refer this answer
Text to speech is built into Android 1.6+. Here is a simple example of how to do it.
TextToSpeech tts = new TextToSpeech(this, this);
tts.setLanguage(Locale.US);
tts.speak("Text to say aloud", TextToSpeech.QUEUE_ADD, null);
More info: http://android-developers.blogspot.com/2009/09/introduction-to-text-to-speech-in.html
Option 2 - If you are particulate about using talkback
refer to this answer
Settings.Secure.putString(getContentResolver(),
Settings.Secure.ENABLED_ACCESSIBILITY_SERVICES, "pkgname/classname");
Settings.Secure.putString(getContentResolver(),
Settings.Secure.ACCESSIBILITY_ENABLED, "1");
Where the pkgname is your package name and the classname is the class name of your accessibility service.
If you need to enable several services or you don't want to destory the previous settings you might want to use : to seperate other services.
Also you might need to run as a system application and you might need the following permissions
<uses-permission android:name="android.permission.WRITE_SETTINGS" />
<uses-permission android:name="android.permission.WRITE_SECURE_SETTINGS" />
this might not work on some versions of Android.
Also refer other answers to this question
PS. If it doesn't work, maybe you could find some luck in /data/data/com.android.providers.settings/databases/settings.db/secure, that's where Android stores secure settings.

How to take off a PX4 autopilot using mavlink message?

I follow the following link's sample code
http://android.dronekit.io/first_app.html
and when I set API VehicleApi.getApi(this.drone).arm(true);
vehicleState.isFlying() automatically becomes true.
Can anybody tell me what this problem is?
What I need is:
1. take off, land
I read from some website that the dronekit-android does not support the mode changing. If so, how should I send the mavlink message to take off and land?
So far, I can sucessfully send the mavlink message to the PX4 board.
Thanks for replying.
Thank you for replying.
BR
SeanH

If you trace though some of the code in dronekit-android, you can see that isFlying is set here with the code below.
boolean isFlying = systemStatus == MAV_STATE.MAV_STATE_ACTIVE || ...;
MAV_STATE_ACTIVE, defined here states
System is active and might be already airborne. Motors are engaged.
So isFlying doesn't mean it's airborne but just that the motors are turned on. That occurs when you call VehicleApi.getApi(this.drone).arm(true); because you are literally arming the vehicle at that point.
For takeoff, you want to use the ControlApi. ControlApi.getApi(drone).takeOff(desired_altitude, listener) and for land you need to use VehicleApi.getApi(drone).setVehicleMode(VehicleMode.COPTER_LAND, listener)
The sample code you're looking at is very old. I suggest you follow the sample app from github.

I have not tried android-dronekit before and I noticed that the src folder have not been updated for more than two years on github.
I advice you to use python-dronekit because there is a powerful library called pymavlink in python and used in python-dronekit. You can build hyper application if you want but first try to takeoff and land in python.

How to open device dock settings programmatically?

I have to open device dock setting through code. I searched but not got proper solution. In samsung galaxy s-3 it goes through settings->Accessory. I tried following code but didn't work
startActivityForResult(new Intent(Settings.System.getString(getContentResolver(), DOCK_SETTING)), 0);

Correct me if I'm wrong, but I believe the reason this doesn't work, (and why you weren't able to find the appropriate Activity Action in the Android Settings), is because Accessory appears to be provided by Samsung for its Galaxy devices. Therefore, you won't be able to find it in the standard Android SDK (yet?).
I'm currently trying to figure out a workaround, so I'll edit this post if I find a solution.
EDIT: Looks like JoxTraex found a way for you to edit the settings via:
Settings.System.putInt(getContentResolver(), "dock_sounds_enabled", 1);
In addition, if you need to modify these settings when the user has docked their device, you should create a BroadcastReceiver to listen for the ACTION_DOCK_EVENT broadcast.

I was able to achieve this through looking at the settings and configuring the setting programatically:
android.provider.Settings.System.putInt(getContentResolver(), "dock_sounds_enabled", 1);
You need the permission:
<uses-permission android:name="android.permission.WRITE_SETTINGS"/>
The code above will write to the settings that enables the dock sound settings on the samsung s3. However; instead of just writing it you should tell the user that the setting is disabled and you need it enabled and allow the user to confirm they want to enable it via a dialog.
On another note, I don't think its possible to go directly to the settings->accessory screen because its was a custom settings added by Samsung. This action is not provided in the Android SDK, so it would take a while to derive what is the actual action or even if it exists.
And if you want to confirm it just query it:
String where = "name = 'dock_sounds_enabled'";
Cursor c = getContentResolver().query(android.provider.Settings.System.CONTENT_URI, null, where, null, null);
Update
Steps for how to handle the dialog's response for configuring the dock setting:
Grab the setting.. if it's 0, bring up the dialog to enable it, otherwise continue with your processing
Once the dialog is up and the user confirms they want to enable it:
Confirm: Put a 1 into the dock sounds then close the dialog
Deny: Don't set the dock setting then close dialog

android camera (froyo) doesnt include static method open()

I must be the first to face this problem because I can't find even a single thread about it.
Today I wanted to start on the camera aspect of my application needs.
I read up some documentation
my manifest looks like this:
<uses-sdk android:minSdkVersion="8" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.camera.autofocus" />
I wrote this in the manifest ABOVE <application> and underneath <manifest>
What im doing is; I have created a new class.
using eclipse as my IDE.
I then declare a field:
Camera _camera;
In the constructor(just to test)
I tried to do:
_camera = Camera.open();
I got an error.
I use my real phone to test the app, because I have no webcam or anytihng for the simulator to use. And the simulator gives me a memory error when I tell it to have a camera.
Anyway, upon finding out why I can't use Camera.open (I included the package: android.graphics.Camera;) Because that is what eclipse included for me when i used to organize imports function.
I looked into the android.jar that eclipse attached for me. Contained in a folder thingy called Android 2.2 -> android.jar
I searched for android.graphics and took a peek in the content of Camera.class
It turns out that my Camera class only has these methods:
Camera()
applyToCanvas()
dotWithNormal()
finalize()
getMatrix()
restore()
rotateX()
rotateY()
rotateZ()
save()
translate()
I intentionally let the parameters out because they are of no importance.
To get to the actual question: Why?
Why is there no open() method, no release() method? and whatever else im missing.. '
Thanks for reading.
Todays lesson: Don't be a smart **s. I was indeed 950% sure I included that specific package. But it was the wrong package. derp. Thanks fo notifying me. Issue is solved.

You are using the wrong Camera.
android.graphics.Camera - A camera instance can be used to compute 3D transformations and generate a matrix that can be applied, for instance, on a Canvas.
android.hardware.Camera - The Camera class is used to set image capture settings, start/stop preview, snap pictures, and retrieve frames for encoding for video. This class is a client for the Camera service, which manages the actual camera hardware.

You are using a wrong Camera class. Use this one http://developer.android.com/reference/android/hardware/Camera.html
You are using Camera from android.graphics.Camera I suppose you need the one from android.hardware.Camera

(yes im 950% sure I have included the package:
android.graphics.Camera;)
You are looking for android.hardware.Camera.

Passing in false to setBlockNetworkLoads() crashes my android app

What is the requirement to make use of this:
mMessageContentView = (WebView) findViewById(R.id.message_content);
mMessageContentView.getSettings().setBlockNetworkLoads(false);
Everytime I set setBlockNetworkLoads to false. My application crashes! If I set it to true, it works fine but my application can't load images over the network.
Is there something I need to do before hand before I can set it to false?

As correctly pointed out by Gallal - I should of made use of the logs. A quick command on dos:
adb logcat
Showed that my application was missing the internet permission in the manifest file. So adding the following to my android manifest solved my problem:
<uses-permission android:name="android.permission.INTERNET" />