问题
Does anybody knows how can I set margins to a custom dialog? I'm asking because I've a custom dialog but when displayed it stretches to fill the parent, even though I set explicitly WRAP_CONTENT on the layout params.
Basically, the dialog contains a listview whose elements must be scrolled down, when the elements are 1 for example, it doesn't stretch, but when more items are added, then the dialog occupies the entire screen.
Any suggestions? I've trying all possible combinations of possible solutions without achieving satisfactory results
EDIT: Added the dialog layout
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_margin="50dip"
android:orientation="vertical"
android:layout_gravity="top|center">
<FrameLayout android:layout_width="fill_parent" android:layout_margin="5dip" android:layout_height="wrap_content">
<TextView android:layout_width="wrap_content" android:layout_height="wrap_content"
android:layout_gravity="center"
android:textSize="20sp" android:textColor="@color/black"/>
<Button android:layout_height="32dip" android:layout_width="32dip"
android:id="@+id/guide_dialog_cross_button"
android:background="@drawable/button_cross_white"/>
</FrameLayout>
<ListView android:layout_width="fill_parent" android:layout_height="wrap_content"
android:fadingEdge="none"
android:layout_margin="5dip"/>
<ImageButton android:layout_width="wrap_content" android:layout_height="wrap_content"
android:layout_margin="5dip" />
</LinearLayout>
回答1:
Margins don't work for Dialogs, I imagine the top-level window view isn't a layout type that supports margins. I've seen posts saying margins will work when defined as the Dialog's style (rather than on the top-level view element), but this does not seem to work either.
What you need to do to work around the issue is to use an inset drawable for your Dialog background, and adjust any padding to account for the background's extra inset. In the example below, I'll just set left & right margins.
Dialog background drawable:
<?xml version="1.0" encoding="utf-8"?>
<!-- drawable is a reference to your 'real' dialog background -->
<!-- insetRight and insetLeft add the margins -->
<inset
xmlns:android="http://schemas.android.com/apk/res/android"
android:drawable="@drawable/dialog_background"
android:insetRight="10dp"
android:insetLeft="10dp">
</inset>
Dialog main view:
<?xml version="1.0" encoding="utf-8"?>
<!-- paddingTop / paddingBottom padding for the dialog -->
<!-- paddingLeft / paddingRight padding must add the additional inset space to be consistent -->
<!-- background references the inset background drawable -->
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:paddingTop="5dp"
android:paddingBottom="5dp"
android:paddingLeft="15dp"
android:paddingRight="15dp"
android:background="@drawable/dialog_background_inset">
<!-- ...the rest of the layout... -->
You may also need to set the background colour of the Dialog itself to transparent. Add a colour resource like so:
<color name="transparent">#00000000</color>
And set the window background colour of the dialog to this (note: you can't assign the colour directly, eclipse will complain)
<style name="Dialog" parent="android:style/Theme.Dialog">
<item name="android:windowBackground">@color/transparent</item>
<item name="android:windowNoTitle">true</item>
<item name="android:windowIsFloating">true</item>
</style>
This style should be passed to your Dialog's constructor as the theme argument, as in new Dialog(context, R.style.Dialog);
回答2:
I had the same problem and I solved it by setting the window background on an InsetDrawable:
AlertDialog.Builder builder = new AlertDialog.Builder(context);
...
...
AlertDialog dialog = builder.create();
ColorDrawable back = new ColorDrawable(Color.TRANSPARENT);
InsetDrawable inset = new InsetDrawable(back, 20);
dialog.getWindow().setBackgroundDrawable(inset);
dialog.show();
In this case the dialog will appear with a margin of 20 to all edges.
回答3:
Margin doesnt seem to work on the custom layout for the dialog, but padding works. Try setting the padding on the top level Linear layout.
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="4dp"
android:paddingRight="4dp" >
回答4:
A workaround can be done like this:
dialog.getWindow().getAttributes().height =
(int) (getDeviceMetrics(context).heightPixels*0.8);
`getDeviceMetrics Method:
public static DisplayMetrics getDeviceMetrics(Context context) {
DisplayMetrics metrics = new DisplayMetrics();
WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
Display display = wm.getDefaultDisplay();
display.getMetrics(metrics);
return metrics;
}
回答5:
This is a straight-forward, programmatic way to set position and size of my dialog with margins.
I tested my approach for a DialogFragment by applying it in the onCreateDialog method:
public Dialog onCreateDialog( Bundle savedInstanceState )
{
// create dialog in an arbitrary way
Dialog dialog = super.onCreateDialog( savedInstanceState );
DialogUtils.setMargins( dialog, 0, 150, 50, 75 );
return dialog;
}
This is the method applying the margins to the dialog:
public static Dialog setMargins( Dialog dialog, int marginLeft, int marginTop, int marginRight, int marginBottom )
{
Window window = dialog.getWindow();
if ( window == null )
{
// dialog window is not available, cannot apply margins
return dialog;
}
Context context = dialog.getContext();
// set dialog to fullscreen
RelativeLayout root = new RelativeLayout( context );
root.setLayoutParams( new ViewGroup.LayoutParams( ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT ) );
dialog.requestWindowFeature( Window.FEATURE_NO_TITLE );
dialog.setContentView( root );
// set background to get rid of additional margins
window.setBackgroundDrawable( new ColorDrawable( Color.WHITE ) );
// apply left and top margin directly
window.setGravity( Gravity.LEFT | Gravity.TOP );
LayoutParams attributes = window.getAttributes();
attributes.x = marginLeft;
attributes.y = marginTop;
window.setAttributes( attributes );
// set right and bottom margin implicitly by calculating width and height of dialog
Point displaySize = getDisplayDimensions( context );
int width = displaySize.x - marginLeft - marginRight;
int height = displaySize.y - marginTop - marginBottom;
window.setLayout( width, height );
return dialog;
}
Here are the helper methods I used:
@NonNull
public static Point getDisplayDimensions( Context context )
{
WindowManager wm = ( WindowManager ) context.getSystemService( Context.WINDOW_SERVICE );
Display display = wm.getDefaultDisplay();
DisplayMetrics metrics = new DisplayMetrics();
display.getMetrics( metrics );
int screenWidth = metrics.widthPixels;
int screenHeight = metrics.heightPixels;
// find out if status bar has already been subtracted from screenHeight
display.getRealMetrics( metrics );
int physicalHeight = metrics.heightPixels;
int statusBarHeight = getStatusBarHeight( context );
int navigationBarHeight = getNavigationBarHeight( context );
int heightDelta = physicalHeight - screenHeight;
if ( heightDelta == 0 || heightDelta == navigationBarHeight )
{
screenHeight -= statusBarHeight;
}
return new Point( screenWidth, screenHeight );
}
public static int getStatusBarHeight( Context context )
{
Resources resources = context.getResources();
int resourceId = resources.getIdentifier( "status_bar_height", "dimen", "android" );
return ( resourceId > 0 ) ? resources.getDimensionPixelSize( resourceId ) : 0;
}
public static int getNavigationBarHeight( Context context )
{
Resources resources = context.getResources();
int resourceId = resources.getIdentifier( "navigation_bar_height", "dimen", "android" );
return ( resourceId > 0 ) ? resources.getDimensionPixelSize( resourceId ) : 0;
}
The helper methods are explained in another of my SO answers.
This Gist contains an extended versions that supports immersve mode too.
回答6:
A simple solution that worked for me was to wrap my entire View in another one, and set the margin to which is now the inner View.
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<LinearLayout
android:layout_margin="22dp"
android:orientation="vertical"
android:layout_width="220dp"
android:layout_height="wrap_content">
... Buttons, TextViews, etc
</LinearLayout>
</LinearLayout>
Obs: that worked when I wanted margins within my AlertDialog. Not regarding the screen.
回答7:
1) change your main parent layout height match_content like below :
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="match_content"
android:layout_margin="50dip"
android:orientation="vertical"
android:layout_gravity="top|center">
2) now add style to your styles.xml
<style name="dialogTheme" parent="Base.Theme.AppCompat.Light.Dialog.Alert"/>
3) now add below code to show dialog :
Dialog dialog = new Dialog(DayActivity.this, R.style.dialogTheme);
dialog.setContentView(R.layout.dialog_custom_layout);
dialog.getWindow().setLayout(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
dialog.show();
回答8:
If you are crating custom dialog with background you can prefer following lines of code.
You can change window property MATCH_PARENT for full screen.
My issue was width of dialog maching to its parent without margin
try following code as per requirement
Window window = event_dialog.getWindow();
window.setGravity(Gravity.CENTER);
WindowManager.LayoutParams wlp = window.getAttributes();
wlp.width = WindowManager.LayoutParams.MATCH_PARENT;
wlp.height = WindowManager.LayoutParams.WRAP_CONTENT;
wlp.flags &= WindowManager.LayoutParams.FLAG_DIM_BEHIND;
window.setAttributes(wlp);
set these property before dialog.show() OR you can set LEFT,RIGHT,TOP,BOTTOM margin to your dialog by setting margin to your root layout and custom background to its child layout like
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp">
<LinearLayout
android:id="@+id/customLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@drawable/card_round_corner"
android:orientation="vertical">
</LinearLayout>
</RelativeLayout>
回答9:
As @simpleApps and @pospi pointed out, you need to add insets to the backgroundDrawable of the Dialog. If you are using a custom dialog, you can try with a drawable defined in a xml
dialog?.window?.setBackgroundDrawableResource(R.drawable.background_dialog)
where R.drawable.background_dialog is defined as
<inset xmlns:android="http://schemas.android.com/apk/res/android"
android:insetLeft="20dp"
android:insetTop="40dp"
android:insetRight="20dp"
android:insetBottom="40dp">
<shape android:shape="rectangle">
<solid android:color="@color/color_background_fragment" />
<corners android:radius="10dp" />
</shape>
</inset>
回答10:
One easy way is to set the root layout to transparent background. Then, have its first child have margins or pre set height and width.
来源：https://stackoverflow.com/questions/6153489/how-to-set-margins-to-a-custom-dialog