Develop Reference

Xamarin Forms Custom Renderer for Android not displaying

I am trying to render a checkbox in a Xamarin Forms app. There is nothing rendered at runtime, as far as I can tell the renderer is not even getting called.
Does anyone understand what I am missing or doing incorrectly?
Here is my class in Forms:
public class LegalCheckbox : View
{
public LegalCheckbox ()
{
}
}
And my custom renderer class in Droid:
public class CheckBoxRenderer : ViewRenderer<LegalCheckbox, CheckBox>
{
protected override void OnElementChanged (ElementChangedEventArgs<LegalCheckbox> e)
{
base.OnElementChanged (e);
CheckBox control = new Android.Widget.CheckBox(this.Context);
control.Checked = false;
control.Text = "I agree to terms";
control.SetTextColor (Android.Graphics.Color.Rgb (60, 60, 60));
this.SetNativeControl(control);
}
}
Along with the Assembly Directive:
[assembly: ExportRenderer(typeof(demo.LegalCheckbox), typeof(demo.Droid.CheckBoxRenderer))]

Took your code and fired up a new project with it. The code appears to function fine.
Only thin I can think that might be causing you an issue is the location of you assembly attribute. I typically place them just above the namespace declaration in the same file as my renderer.
I threw what I created up on my github maybe you can spot the difference.
https://github.com/DavidStrickland0/Xamarin-Forms-Samples/tree/master/RendererDemo
#Thibault D.
Xlabs isn't a bad project but its basically just all the code the opensource community came up with during the first year or so of Xamarin.Forms life. Its not really "Their Labs projects" and considering how much of it is marked up with Alpha Beta and the number of bugs in their issues page it's probably best not to imply that the Xamarin company has anything to do with it.

I am not sure if that is the issue but it would make more sense to me if your LegalCheckbox would inherit from a InputView rather than View.
Also, even if Xamarin.Forms does not have a Checkbox control you can still have a look at their "Labs" project here:
https://github.com/XLabs/Xamarin-Forms-Labs/wiki/Checkbox-Control
(And I can actually see that they inherit from View...)

Android cordova chromeview : Not implemented reached in virtual quota::SpecialStoragePolicy

I'm working on a phonegap project which contains a canvas overlayed with kinetic.js, which allows a user to pinch zoom and pan around an image, then draw annotations on it. it works spliendidly in a browser and on windows and apple tablets, but of course android is a good bit slower.
as a solution, i've released the app using https://github.com/thedracle/cordova-android-chromeview. after switching my main java class to use ChromeView as the webview, i'm getting this error on startup:
12-03 13:21:09.083: E/chromium(13917): [ERROR:aw_browser_context.cc(191)] Not implemented reached in virtual quota::SpecialStoragePolicy* android_webview::AwBrowserContext::GetSpecialStoragePolicy()
after debugging through the codebase, it looks like the error is triggering here:
private void setNativeContentsClientBridge(int nativeContentsClientBridge) {
mNativeContentsClientBridge = nativeContentsClientBridge;
}
(AwContentsClientBridge.java line 36).
i'm trying to find out what the nativeContentsClientBridge int is. My value is 1611312352 but i haven't a notion of what that represents.
my gut feel is that the chromium browser is missing an implementation for accessing localstorage. i found this bug:
https://github.com/pwnall/chromeview/issues/27
where someone is experiencing the same thing, but there is no solution.
for assistance, this is my main activity class:
package com.companion;
import org.apache.cordova.Config;
import org.apache.cordova.CordovaActivity;
import us.costan.chrome.ChromeSettings;
import us.costan.chrome.ChromeView;
import android.os.Bundle;
public class CompanionApp extends CordovaActivity
{
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState)
{
ChromeView chromeView = new ChromeView(CompanionApp.this);
ChromeSettings settings = chromeView.getSettings();
settings.setJavaScriptEnabled(true);
settings.setDatabaseEnabled(true);
settings.setDomStorageEnabled(true);
setContentView(chromeView);
super.loadUrl(Config.getStartUrl());
}
}
Thanks for your help,
Margaret

Don't know if it's normal, but it seems that a method's not implemented in Chromium base code : https://github.com/01org/pa-chromium/blob/master/android_webview/browser/aw_browser_context.cc
Here's that particular method:
quota::SpecialStoragePolicy* AwBrowserContext::GetSpecialStoragePolicy() {
// TODO(boliu): Implement this so we are not relying on default behavior.
NOTIMPLEMENTED();
return NULL;
}
I hope it helps :)

Phonegap Local Notification Plugin for Android

I'm working on a "Reminders" application on Android using Phonegap[Cordova 2.2].
The user enters a specific date for his reminder and I'm supposed to notify him on time.
I used this plugin to Just show a notification in the status bar & they are working fine.
But I want the notifications to show at specific times. Is there some method to do it ?
I found this plugin that's supposed to do what I want but it's not working, it shows errors at :
import com.phonegap.api.Plugin;
import com.phonegap.api.PluginResult;
The import com.phonegap.api.Plugin cannot be resolved
So, how can I fix this error ? I know it might be easy, but I never made native Android Apps before so I'm kind of confused.
Thanks

Looks like a difference between 2.0.0 and 2.2.0, and like the plugin needs updating.
import org.apache.cordova.api.CordovaPlugin;
import org.apache.cordova.api.PluginResult;
This should give you a jumping off point:
http://docs.phonegap.com/en/2.2.0/guide_plugin-development_android_index.md.html#Developing%20a%20Plugin%20on%20Android

For the new Phonegap Release you must also change some stuff:
The LocalNotification class must "extends CordovaPlugin" now
Import classes like eomer says
The execute method of LocalNotification.java must return a boolean now
Change all return arguments that are affected (from PluginResult) to boolean of your choice
Get the context in a new way ctx = this.cordova.getActivity(); and give it the ...AlarmHelper(ctx)

Why are the images in WidgetTab not shown if minSdkVersion>10?

I have been attempting to create a simple TabActivity with 3 Tabs. All works except if I put android:minSdkVersion="11" in the Manifest file, the icons are not shown. If I set `minSdkVersion="10", all is well.
I have looked high and low, but I have not been able to determine what is wrong.
I have put the same images in the seemingly appropriate resource directories:
res/drawable-hdpi-v5
res/drawable-ldpi-v5
res/drawable-mdpi-v5
res/drawable-xhdpi-v5
And the the code is simple:
import android.app.TabActivity;
import android.content.res.Resources;
import android.os.Bundle;
import android.util.Log;
import android.view.ViewGroup.LayoutParams;
import android.widget.LinearLayout;
import android.widget.TabHost;
import android.widget.TabWidget;
public class Review extends TabActivity {
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
TabHost tabs = getTabHost();
getLayoutInflater().inflate(R.layout.main,
tabs.getTabContentView(), true);
Resources resources=getResources();
Log.d("testing", String.format("icon: %d.%d",
resources.getDrawable(R.drawable.review).getIntrinsicWidth(),
resources.getDrawable(R.drawable.review).getIntrinsicHeight()));
TabHost.TabSpec details = tabs.newTabSpec("review"). setContent(R.id.review).
setIndicator(getString(R.string.review),
resources.getDrawable(R.drawable.review));
TabHost.TabSpec gallery=tabs.newTabSpec("gallery").setContent(R.id.photos)
.setIndicator(getString(R.string.gallery),
resources.getDrawable(R.drawable.photos));
TabHost.TabSpec reservation=tabs.newTabSpec("reservation").
setContent(R.id.reservation)
.setIndicator(getString(R.string.reservation),
resources.getDrawable(R.drawable.reservation));
tabs.addTab(details);
tabs.addTab(gallery);
tabs.addTab(reservation);
}
}
In digging into this, the only difference I can see internally under android 2.0 vs 3.0 is that Android uses a RelativeLayout instead of a LinearLayout in the 2.0 implementation.
Just to be certain that the icons images are being found, Log.d of above shows:
icon: 32.32 as it should.
Why does this shift from android 2.0 to 3.0 do this???? I am hopeful that someone else has run into this and it is obvious. Thanks very much for your help!
-- UPDATE:
I discovered today, as I looked more closely at what is actually happening when this code is built for android 3.0+, I learned that the ImageView's that come about when SetIndeicator(string, drawable) is called for each TabSpec, are actually never set and are actually NULL (ImageView.mDrawable==null) and INVISBLE.
If I force set those drawables to be set, and call ImageView.setVisiblity(View.VISIBLE) then they show up. However under android 2.0 they appear stacked with the image above and the text below as in:
<image>
<text>
Under android 3.0 they appear (when forced as above) side by side as in:
<image><text>
Thus it seems that things have changed a great deal and I need to investigate the changes for android 3.0 more carefully.
Stay tuned for more...
-- Final UPDATE:
Ultimately, I abandoned this avenue and decided that this style of doing things changed and is perhaps now depreciated and there are other better ways to do this and the icons are a bit old style.

strange, this solves the problem
//bmOptions.inSampleSize = 1;
//or better
bmOptions.inScaled = false;
more at:
https://stackoverflow.com/a/12088287/1320686

LogCat not displaying anything after crash/reinstall

First off, as background: I am on a Mac, running OS X 10.6.7. Using Eclipse for an Android Development class I'm in (and hopefully eventually to actually develop directly for Android).
I had a nasty crash of Eclipse a few days ago, and after restarting I stopped getting any output from LogCat whatsoever. I tried everything I could think of, and I couldn't get anything at all to show up in the log. I tried a nuke-it-from-orbit reinstall of Eclipse, and it's at least made a little bit of a difference. When I run this code snippet I came up with to test things:
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
public class LogTester extends Activity {
/** Called when the activity is first created. */
public static final String TAG = "LogTester";
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Log.d(TAG, "Activity was created");
Log.d(TAG, "Anybody Home?");
}
}
...it shows me this (apparently I can't post images directly as a noob), but when I actually click on the LogTester tab of LogCat, I see nothing. The same thing vice-versa when I click back over to the main log tab, which as you can see should have 11 new items in it.
I tried changing the font since maybe there was some sort of issue with displaying the font, and I've heard there are weird issues with fonts and 10.6.7. But I get a "Problems occurred when invoking code from plug-in: "org.eclipse.ui.workbench"." error and a complete refusal to change the font type. I can't figure out where Eclipse hides this preference so I can try and fiddle with it manually.
Anyone have any ideas/suggestions as to things I should try next? This is absolutely maddening. Thanks!
UPDATE (3/31 1am): I deleted and recreated my AVM for about the 15th time and LogCat suddenly started working. Hell if I know why, but I'm not questioning it.

try switching to DDMS perspective and click on your active emulator in the Device tab. Your Logcat should refresh then.

I know this post is old but a filter got turned on for some reason using Firebase which really confused me for a few mintues while I tried to figure out what was going on.
Here's where you change the filter (in the android monitor panel):