I saw this link: https://learn.microsoft.com/en-us/xamarin/android/user-interface/controls/spinner
I want to change color of the spinner text font:
<Spinner
android:id="#+id/spinner1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:spinnerMode="dropdown"
android:textColor="#FF0080FF"
android:popupBackground="#FF553232"
android:background="#FFD733D7"/>
But in the output, Color of text is always white.
Option 1. add your custom theme to style.xml. This will change the textcolor of items in the dropdown list.
<style name="MySpinnerTheme" parent="android:Theme">
<item name="android:textColor">#android:color/holo_green_dark</item>
</style>
layout
<Spinner
android:id="#+id/spinner1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/MySpinnerTheme"
android:spinnerMode="dropdown"/>
Option 2. If you want to change the selected item only.
...
Spinner.ItemSelected += new EventHandler<AdapterView.ItemSelectedEventArgs>(spinner_ItemSelected);
...
private void spinner_ItemSelected(object sender, AdapterView.ItemSelectedEventArgs e){
Spinner spinner = (Spinner)sender;
TextView textView = (TextView)spinner.SelectedView;
textView.SetTextColor(Color.Rgb(0, 235, 0));
}
Related
I have a ScrollView added to a FrameLayout. In a button click I remove the ScrollView from the FrameLayout and add an element derived from ViewGroup. If the button is clicked again the ViewGroup is removed and the ScrollView is added back. While adding the ScrollView back to the FrameLayout after removing the ViewGroup I get the following exception from the AddView method of the FrameLayout. Actually it is thrown from the AddView() method of ViewGroup class, since FrameLayout is derived from ViewGroup.
Unhandled Exception:
Java.Lang.NullPointerException: Attempt to invoke virtual method 'void
android.view.View.resolveLayoutParams()' on a null object reference
occurred
I have already tried to toggle the visibility of both Views instead of adding one and removing the other. But after toggling visibility, the application crashes every time when the FrameLayout's OnLayout is called such as when the Android keyboard appears or if the device orientation changes.
I am sorry that I am not able to provide the code. Because my code is very complex and I could not reproduce this problem in a simple sample. I just posted this question as a last resort.
I know it is not possible to get solution if code is not included. But any input related to this problem will be helpful.
Since you cannot provide the code here, I can only write part of the code to show your requirements:
in xaml,i add a ScrolView (with its children) and a LinearLayout(which as your ViewGroup) into a FrameLayout:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent">
<FrameLayout
android:id="#+id/framelayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_above = "#+id/click"
>
<ScrollView
android:id="#+id/scroll"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text ="text in scrollview"
/>
</LinearLayout>
</ScrollView>
<LinearLayout
android:id="#+id/linearlayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:visibility="gone"
>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text ="text iFn LinearLayout"
/>
</LinearLayout>
</FrameLayout>
<Button
android:id = "#+id/click"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="click"
android:layout_alignParentBottom="true"
/>
</RelativeLayout>
in activity show and hide the Scrolview and LinearLayout by click Button:
private int num = 1;
protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
// Set our view from the "main" layout resource
SetContentView(Resource.Layout.activity_main);
Button button = FindViewById<Button>(Resource.Id.click);
FrameLayout frameLayout = FindViewById<FrameLayout>(Resource.Id.framelayout);
ScrollView scrollView = FindViewById<ScrollView>(Resource.Id.scroll);
LinearLayout linearLayout = FindViewById<LinearLayout>(Resource.Id.linearlayout);
button.Click += delegate
{
if (num % 2 ==0)
{
scrollView.Visibility = Android.Views.ViewStates.Gone;
linearLayout.Visibility = Android.Views.ViewStates.Visible;
}
else
{
linearLayout.Visibility = Android.Views.ViewStates.Gone;
scrollView.Visibility = Android.Views.ViewStates.Visible;
}
num++;
};
}
I want to combine status bar and toolbar with gradient like this
I have tried to set status bar transparent and make the toolbar big and set the gradient .
But It also makes your UI goes under the Soft navigation keys.
And also soft keyboard is covering the EditTexts.
android:windowSoftInputMode="adjustPan" not working
if (Build.VERSION.SdkInt >= BuildVersionCodes.Kitkat)
{
Window window = Window;
window.AddFlags(WindowManagerFlags.LayoutNoLimits);
window.AddFlags(WindowManagerFlags.TranslucentNavigation);
}
Is there any way only the status bar make transparent rather than transparent both status bar and navigation button on the bottom.
You could alse do like this,add the code into the OnCreate method :
protected override void OnCreate(Bundle savedInstanceState)
{
if (Build.VERSION.SdkInt >= Build.VERSION_CODES.Kitkat)
{
Window w = Window;
w.AddFlags(WindowManagerFlags.TranslucentStatus);
w.SetSoftInputMode(SoftInput.StateHidden|SoftInput.AdjustResize);
}
base.OnCreate(savedInstanceState);
SetContentView(Resource.Layout.activity_other);
}
then create the gradient.xml in Resources/drawable :
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<gradient android:angle="135"
android:startColor="#f56f2c"
android:endColor="#fa9f46"/>
</shape>
at last in the layout.xml :
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:orientation = "vertical"
android:layout_height="match_parent"
android:fitsSystemWindows= "true"
android:background= "#drawable/gradient"
>
<!--use Toolbar-->
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:title="标题"
app:titleTextColor="#fff"
app:subtitle="副标题"
app:subtitleTextColor="#fff"/>
<!--if dont use Toolbar,RePresent Toolbar-->
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="44dp">
<ImageView
android:layout_gravity="center_vertical"
android:src="#drawable/ic_arrow_back_white_24dp"
android:layout_marginLeft="10dp"
android:layout_width="35dp"
android:layout_height="35dp" />
<TextView
android:layout_gravity="center_vertical"
android:textSize="25sp"
android:gravity="center_horizontal"
android:textColor="#fff"
android:text="Test Title"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fillViewport="true"
android:id="#+id/scrollView1"
android:background = "#fff" //set the background color of your content
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation ="vertical" >
<!--your content -->
...
</LinearLayout>
</ScrollView>
</LinearLayout>
Why don't you set the color of status bar same as the startColor of gradient and let the toolbar start from where it does.
Create a static method that sets the status bar colour something like below:
public static void SetStatusBarGradiant(Activity activity)
{
if (Build.VERSION.SdkInt >= BuildVersionCodes.Lollipop)
{
Window window = activity.Window;
Drawable background = ResourcesCompat.GetDrawable(activity.Resources, Resource.Drawable.abc_ab_share_pack_mtrl_alpha, null);
window.AddFlags(WindowManagerFlags.DrawsSystemBarBackgrounds);
window.SetStatusBarColor(Android.Graphics.Color.Transparent);
window.SetNavigationBarColor(Android.Graphics.Color.Transparent);
window.SetBackgroundDrawable(background);
}
}
Then add a gradient.xml in drawable something like below see to it you set the start color and end color as per your requirement:
gradient.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape>
<gradient
android:angle="90"
android:startColor="#FFFF0000"
android:endColor="#FF00FF00"
android:type="linear" />
</shape>
</item>
</selector>
Goodluck
Revert if you have queries
I'm working on Xamarin android. I want a spinner to show up on a button click or the spinner should be on top of a button, the other way I can say. Sounds crazy but that's the stuff I got in my head a couple of days back! Yeah I've seen Spinner. May be what I'm asking is not part of the plan, but I wanna implement that!
UPDATE 2: Let me explain with an example.
Consider the Web 2.0 scientific calculator. There is a button π. You long press the button and you will get a drop down. The constant that you select from the drop down will be displayed in the textbox. I want the same functionality with the spinner. Just the difference is I want it on the button click rather than a long press. Hope I'm clear now.
That's the part of code I tried with:
<!--main.axml-->
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center"
android:id="#+id/myTitle">
<!--some stuff-->
<ImageButton android:onClick="onClick"
android:id="#+id/btnPi"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight=".33"
android:padding="100dip"
android:src="#drawable/pi" />
<Spinner
android:onClick="onClick"
android:id="#+id/btnConst"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight=".33"
android:prompt="#string/cons" />
<!--And few other stuffs-->
</LinearLayout>
<!--Strings.xml-->
<string name="cons">const</string>
<string-array name="ConsArray">
<item>Angstrom star</item>
<item>Faraday constant</item>
<item>Planck constant</item>
<item>Rydberg constant</item>
<item>Stefan-Boltzmann constant</item>
<item>electric constant</item>
<item>mag. constant</item>
<item>neutron mass</item>
</string-array>
It doesn't matter's to me whether I use a Button or a ImageButton ! I'm happy with either of it. Basically I just want a drop-down menu to popup, as soon as I click that button. Can anyone help me with this? Thanks in advance.
UPDATE: When I worked on York Shen's answer , I got this blank space occupied by the spinner:
I want a spinner to show up on a button click.
You could put a Button on Spinner by using a FrameLayout :
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<Spinner
android:id="#+id/spinner"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:prompt="#string/planet_prompt"
/>
<Button
android:id="#+id/bt_spinner"
android:text="Spinner Button"
android:layout_width="match_parent"
android:layout_height="wrap_content"
/>
</FrameLayout>
Then, every time your Button is click, you could use spinner.PerformClick() method to show your Spinner :
bt_spinner.Click += (sender, e) =>
{
spinner.PerformClick();
};
Effect.
Update :
I cant reproduce your problem, but here is my complete code from the document, you could use it and try again :
spinner.ItemSelected += new EventHandler<AdapterView.ItemSelectedEventArgs>(spinner_ItemSelected);
var adapter = ArrayAdapter.CreateFromResource(this, Resource.Array.planets_array, Android.Resource.Layout.SimpleSpinnerItem);
adapter.SetDropDownViewResource(Android.Resource.Layout.SimpleSpinnerDropDownItem);
spinner.Adapter = adapter;
bt_spinner.Click += (sender, e) =>
{
spinner.PerformClick();
};
...
private void spinner_ItemSelected(object sender, AdapterView.ItemSelectedEventArgs e)
{
Spinner spinner = (Spinner)sender;
string toast = string.Format("The planet is {0}", spinner.GetItemAtPosition(e.Position));
Toast.MakeText(this, toast, ToastLength.Long).Show();
}
In your XAML, set the spinner to not be visible. In your onClick event, set change the visibility. You may have to do more in onClick if you want the things below the spinner in the linear layout to move out of the way.
I am working on chat application where Edittext and send button is at bottom.
Activity is fullscreen, hidden navigation and status bar.
I need to push edittext and send button up when keyboard comes into focus.
I tried to set android:windowSoftInputMode="adjustResize" but it didn't worked.
I tried using AndroidBug5497Workaround.assistActivity(this) class referred from https://github.com/madebycm/AndroidBug5497Workaround but it didn't worked.
Below is my activity theme and code in activity to hide bar and make full screen :
decorView = getWindow().getDecorView();
uiOptions = View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY
| View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY;
Theme :
<style name="AppTheme_DarkStatus" parent="Theme.AppCompat.Light.NoActionBar">
<item name="colorPrimary">#color/colorPrimary</item>
<item name="colorPrimaryDark">#color/colorPrimaryveryDark</item>
<item name="colorAccent">#color/colorAccent</item>
<item name="windowActionBar">false</item>
<item name="windowNoTitle">true</item>
<item name="android:windowContentTransitions">true</item>
<item name="android:windowDrawsSystemBarBackgrounds">true</item>
XMl :
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#+id/include_view"
android:isScrollContainer="true"
android:background="#android:color/white">
<com.handmark.pulltorefresh.library.PullToRefreshListView
xmlns:ptr="http://schemas.android.com/apk/res-auto"
android:id="#+id/lv_chat"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_above="#+id/rl_send"
android:divider="#null"
android:fadeScrollbars="false"
android:fadingEdge="none"
android:overScrollMode="never"
android:scrollbars="none"
ptr:ptrHeaderSubTextColor="#color/c_input_text_color"
ptr:ptrHeaderTextColor="#color/c_input_text_color"
ptr:ptrOverScroll="false"
ptr:ptrPullLabel="Pull to refresh"
ptr:ptrRefreshLabel="Loading..."
ptr:ptrReleaseLabel="Release to refresh"
ptr:ptrRotateDrawableWhilePulling="true"
ptr:ptrShowIndicator="false" >
</com.handmark.pulltorefresh.library.PullToRefreshListView>
<RelativeLayout
android:id="#+id/rl_send"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:background="#color/c_white"
android:gravity="center" >
<View
android:id="#+id/view_dummy"
android:layout_width="match_parent"
android:layout_height="#dimen/d_diff_p5dp"
android:background="#color/c_text_light_color" />
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/view_dummy"
android:layout_toLeftOf="#+id/btn_send"
android:layout_marginRight="#dimen/d_diff_5dp"
android:layout_marginLeft="#dimen/d_diff_10dp"
android:layout_marginTop="#dimen/s_diff_7sp"
android:layout_marginBottom="#dimen/s_diff_7sp"
android:background="#drawable/opawhite_rectcorner_all" android:id="#+id/relativeLayout">
<EditText
android:id="#+id/et_message"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="#dimen/d_diff_1dp"
android:background="#null"
android:focusableInTouchMode="true"
android:maxHeight="100dp"
android:hint="Type here..."
android:maxLength="150"
android:textSize="#dimen/s_diff_16sp"
android:padding="#dimen/s_diff_6sp"
android:textColorHint="#color/c_input_text_color"
android:textColor="#color/c_black" />
</RelativeLayout>
<Textview
android:id="#+id/btn_send"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#color/c_white"
android:text="Send"
android:padding="#dimen/d_diff_5dp"
android:layout_marginRight="#dimen/d_diff_5dp"
android:gravity="center"
android:textColor="#color/c_orange_main"
android:textSize="#dimen/s_diff_16sp"
android:layout_centerVertical="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"/>
</RelativeLayout>
</RelativeLayout>
I want to show edittext and send button above keyboard but it overlaps edittext.
Thanks!
The property android:windowSoftInputMode="adjustResize" doesn't work with full screen activity, you have to remove activity full screen flags in order to get advantage of adjust resize.
see this:
A fullscreen window will ignore a value of SOFT_INPUT_ADJUST_RESIZE for the window's softInputMode field; the window will stay fullscreen and will not resize.
I am trying to create a table view with a text view and a button in android. Below is my sample code ( work in progress ). As I am very new to android please help me how to arrange the text view and the button as in the image. Now I am getting button and text view. But its weird.
My Code
TableLayout table = (TableLayout)findViewById(R.id.tableLayout_1);
for (int i = 0; i<30; i++)
{
TableRow row = new TableRow(this);
row.setBackgroundColor(Color.DKGRAY);
TextView tv = new TextView(this);
Button btn=new Button(this);
tv.setTextAppearance(getApplicationContext(), R.style.maxWid);
tv.setText("Sample Text Here");
row.addView(tv);
btn.setText("Approves");
row.addView(btn);
table.addView(row);
}
Style.xml
<style name="maxWid">
<item name="android:textStyle">bold|italic</item>
<item name="android:textColor">#FFFFFF</item>
<item name="android:layout_width">fill_parent</item>
</style>
main_layout.xml
<ScrollView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:scrollbars="vertical"
android:layout_weight="1">
<TableLayout
android:id="#+id/tableLayout_1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:shrinkColumns="*"
android:stretchColumns="*"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
>
</TableLayout>
</ScrollView>
Expected format
Fighting with this since 1 day.. Please help
Thanks in advance!
what you can do here is create a layout xml using RelativeLayout and then add that into your TableRow.