I try to get MapView from Resource Layout but it returns null:
var map_view = FindViewById<MapView>(Resource.Id.emap);
mylayout.xml like :
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/etklmap"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<Button
android:id="#+id/zoomOutButton"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Zoom Out" />
<com.google.android.maps.MapView
android:id="#+id/emap"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:apiKey="apikey" />
</LinearLayout>
So is there any way to get view without calling SetContentView(Resource.Layout.mylayout);
The resource file is just XML - it doesn't become a collection of viewgroups and widgets until it's "inflated"
One way to inflate XML is to use SetContentView.
Another way is to use the inflaterservice - see this monodroid question (and answers) for an example: Android: Getting the View added with LayoutInflator
Note that - under the covers - all setcontentview does is to inflate the XML using exactly the same inflaterservice, passing in the activity as the parent frame for the inflation.
The official android docs on this are http://developer.android.com/reference/android/view/LayoutInflater.html
Related
The following code used to work fine in 1.0.2, but does not work in 1.1.0 stable - literally removes the effect of every other constraint in all views in the layout. Is there a reason or is it just a quirk? Took a while to hunt it down.
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:app1="http://schemas.android.com/apk/res-auto">
<TextView
android:id="#+id/viewOne"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_constraintBottom_toTopOf="#+id/viewTwo" <-- culprit
tools:text="View one"/>
<TextView
android:id="#+id/viewTwo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app1:layout_constraintTop_toBottomOf="#+id/viewOne" <-- culprit
tools:text="View two"/>
</android.support.constraint.ConstraintLayout>
Removing one of the culprit constraints brings everything back to normal in 1.1.0.
Add app:layout_constraintTop_toTopOf="parent" to viewOne and it will work again. You can also remove app:layout_constraintBottom_toTopOf="#+id/viewTwo" and nothing will change since it is not needed.
Although the two views are vertically constrained, they are constrained to one another and nothing ties them to the container. The group will slide to the top by default if not otherwise constrained. It look like both will slide to the top in 1.1.0 and line up one below the other in 1.0.2. This may be just a side effect of how the views are defined.
In any case, the XML is not well-formed and the views should all be constrained either directly or indirectly to the containing ConstraintLayout. Make the changes above and all will be well.
Just remove
app:layout_constraintBottom_toTopOf="#+id/viewTwo"
from the above xml code and you are good to go.
Below given is the code that works perfectly well.
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:app1="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="#+id/viewOne"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
tools:text="View one" />
<TextView
android:id="#+id/viewTwo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app1:layout_constraintTop_toBottomOf="#+id/viewOne"
tools:text="View two" />
</android.support.constraint.ConstraintLayout>
So in your case only
app:layout_constraintBottom_toTopOf="#+id/viewTwo" this is the culprit.
I would like to show progress bar when android webview is loading and I used Activity.setProgess(int).
Android documentation says setProgress(int progress) was deprecated in API level 24. No longer supported starting in API 21.
So, what should I use instead to show progress when webview is loading?
Implement toolbar with progress bar or spinner.
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar_actionbar"
style="#style/HeaderBar"
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="?actionBarSize"
android:visibility="visible"
app:layout_scrollFlags="scroll|enterAlways"
app:popupTheme="#style/ActionBarPopupThemeOverlay"
app:theme="#style/ActionBarThemeOverlay"
>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:gravity="right"
android:divider="?android:dividerVertical"
android:dividerPadding="8dp"
android:orientation="horizontal"
android:showDividers="beginning|middle">
<ProgressBar
style="#style/Widget.AppCompat.ProgressBar.Horizontal"
android:id="#+id/toolbarProgressBar"
android:visibility="gone"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"/>
</RelativeLayout>
</android.support.v7.widget.Toolbar>
Then find it in your view and update.
ProgressBar progressBar = (ProgressBar)findViewById(R.id.toolbarProgressBar);
progressBar.setIndeterminate(false);
progressBar.setProgress(x);
I have simple list view with list items defined by following layout:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#drawable/list_item_selector" >
<TextView
android:id="#+id/menuItemTextView"
android:clickable="false"
android:focusable="false"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:background="#00000000"
android:padding="20dp"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textColor="#color/blue"
android:textIsSelectable="true" />
<ImageView
android:id="#+id/arrow"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:paddingRight="10dp"
android:src="#drawable/arrow" />
> </RelativeLayout>
When I click TextView the listView.onItemClickListener is not called. The problem occurs on Android 4. Android 2.x is OK. Is there any trick to pass an event from TextView to its ListView without defining onClickListner on the TextView?
In your main activity just make you listview as focusable true. This worked for me. If you are using a custom list view the focus is passed to its childs and not the list so to get the focus back to listview use
listView.focusable(true);
and the other things as textview just set their focus as false.
It was the android:textIsSelectable="true" attribute. Don't follow lint hints blindly.
android:inputType="textMultiLine" can also cause this problem. If you've included that attribute in your TextView xml, try removing it.
I have come across this problem. I have a tab widget on top of the view, with four tabs in it. I have been asked to change the background color of the whole tab view area. Not for any tab, but the whole area of that tab view.
I also been asked for not changing any source code for some branding reason. So I could only do it through xml file. I searched around but seems all solution is by using java code. So I wonder if there is a way that I could change the widget background color (just color, not images) by using only resources files?
Here is my layout file for the tab layout:
<?xml version="1.0" encoding="utf-8"?>
<TabHost xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#android:id/tabhost"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<RelativeLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:padding="5dp"
>
<TabWidget
android:id="#android:id/tabs"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="#color/tabbackgroundcolor" />
<FrameLayout
android:layout_below="#android:id/tabs"
android:id="#android:id/tabcontent"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:padding="5dp"
/>
</RelativeLayout>
</TabHost>
You could see that I added "android:background="#color/tabbackgroundcolor"" in the TabWidget part, however it not work..
Thank you!
Can any one help me out how how this widget can be developed as in attached.The widget in the attached is of "Take a photo" or select photo" UI. Just want to know how can we create this UI widget. Any tutorials/and discussions/reference would help.Thank You.
Use hierarchyviewer tool from Android SDK. I tried.
You can learn that this menu is a custom baked dialog or activity, created from FrameLayout, ScrollView, LinearLayout and Buttons.
So to make one, you'll have to roll your own in similar style.
Here is how the xml would look like. You'd have to have a background for the FrameLayout and also 2 for the buttons. One with a full rectangle and the other without the top line. Then some margins/paddings tweaking and you should be fine.
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<ScrollView
android:id="#+id/scrollView1"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<LinearLayout
android:id="#+id/linearLayout1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical" android:layout_gravity="center_vertical|center_horizontal">
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button" android:background="#444" android:textColor="#fff" android:layout_marginBottom="1dp"/>
<Button
android:id="#+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button" android:background="#444" android:textColor="#fff"/>
</LinearLayout>
</ScrollView>
</FrameLayout>
Note: this is based on Mice's answer.
I don't think its native android widget. May be you can find it on github try searching over there.
Use GreenDroid library, it has what you are looking for. It is a nice library with host of features. To test it download this sample application