问题
As the Android documentation says
Snackbars provide lightweight feedback about an operation. They show a brief message at the bottom of the screen on mobile and lower left on larger devices.
Is there any alternative by which we can show snackbars at top of the screen instead of the bottom?
Right now I am doing something like this which shows a snackbar at the bottom of the screen.
Snackbar.make(findViewById(android.R.id.content), "Hello this is a snackbar!!!",
Snackbar.LENGTH_LONG).setAction("Undo", mOnClickListener)
.setActionTextColor(Color.RED)
.show();
回答1:
It is possible to make the snackbar appear on top of the screen using this:
Snackbar snack = Snackbar.make(parentLayout, str, Snackbar.LENGTH_LONG);
View view = snack.getView();
FrameLayout.LayoutParams params =(FrameLayout.LayoutParams)view.getLayoutParams();
params.gravity = Gravity.TOP;
view.setLayoutParams(params);
snack.show();
From the OP:
I had to change the first line:
Snackbar snack = Snackbar.make(findViewById(android.R.id.content), "Had a snack at Snackbar", Snackbar.LENGTH_LONG);
回答2:
CoordinatorLayout coordinatorLayout=(CoordinatorLayout)findViewById(R.id.coordinatorLayout);
Snackbar snackbar = Snackbar.make(coordinatorLayout, "Text", Snackbar.LENGTH_LONG);
View view = snackbar.getView();
CoordinatorLayout.LayoutParams params=(CoordinatorLayout.LayoutParams)view.getLayoutParams();
params.gravity = Gravity.TOP;
view.setLayoutParams(params);
snackbar.show();
回答3:
Combined solution from the above ones:
final ViewGroup.LayoutParams params = snackbar.getView().getLayoutParams();
if (params instanceof CoordinatorLayout.LayoutParams) {
((CoordinatorLayout.LayoutParams) params).gravity = Gravity.TOP;
} else {
((FrameLayout.LayoutParams) params).gravity = Gravity.TOP;
}
snackbar.getView().setLayoutParams(params);
Still suffers from the improper animation.
回答4:
You can do the following to position a SnackBar anywhere inside a layout (This method has No Animation Issues)
1) According to:
https://developer.android.com/reference/android/support/design/widget/Snackbar.html#make(android.view.View, java.lang.CharSequence, int)
Snackbar make (View view, CharSequence text, int duration)
Make a Snackbar to display a message Snackbar will try and find a parent view to hold Snackbar's view from the value given to view. Snackbar will walk up the view tree trying to find a suitable parent, which is defined as a CoordinatorLayout or the window decor's content view, whichever comes first.
So, one can position a snackBar anywhere inside a layout simply by adding a Coordinator Layout in the desired location and using that Coordinator Layout as the view argument inside Snackbar.make method above.
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
tools:context=".MainActivity"
android:orientation="vertical"
android:id="@+id/rl"
xmlns:tools="http://schemas.android.com/tools"
xmlns:android="http://schemas.android.com/apk/res/android">
<!-- Coordinator Layout used to position the SnackBar -->
<android.support.design.widget.CoordinatorLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/cl"
android:layout_alignParentTop="true"
android:background="@android:color/transparent">
</android.support.design.widget.CoordinatorLayout>
<!-- add your layout here -->
</RelativeLayout>
2) The Coordinator Layout used to display the SnackBar should be on top of all other views (highest elevation). In order to do that, one might either call bringToFront() on the coordinator layout or elevate the coordinator layout (add
android:elevation="10dp" for example)
3) At this point the snackBar will show up in the desired location, but the snackBar is displayed with a bottom to top animation (default behavior). In order to achieve a top to bottom animation, you can do the following:
- Rotate Coordinator layout used inside Snackbar.make method by 180 degrees
4) After step 3, the snackBar will be displayed with a top to bottom animation, but the message and action text are rotated and the gravity is reversed, so as a final step, I did the following:
- Got SnackBar View, found the LinearLayout holding the TextView responsible about displaying the message and the TextView responsible about the action, and rotated the parent LinearLayout by 180 degress
5) Example:
public class MainActivity extends AppCompatActivity {
private final String TAG = MainActivity.class.getSimpleName();
private RelativeLayout rl;
private CoordinatorLayout cl;
private CoordinatorLayout cl1;
private CoordinatorLayout cl2;
private CoordinatorLayout cl3;
private CoordinatorLayout cl4;
private Snackbar snackbar_updated;
private Snackbar snackbar_updated1;
private Snackbar snackbar_updated2;
private Snackbar snackbar_updated3;
private Snackbar snackbar_updated4;
private Snackbar snackbar_ordinary;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
rl = (RelativeLayout) findViewById(R.id.rl);
cl = (CoordinatorLayout) findViewById(R.id.cl);
cl1 = (CoordinatorLayout) findViewById(R.id.cl1);
cl2 = (CoordinatorLayout) findViewById(R.id.cl2);
cl3 = (CoordinatorLayout) findViewById(R.id.cl3);
cl4 = (CoordinatorLayout) findViewById(R.id.cl4);
cl.bringToFront();
cl1.bringToFront();
cl2.bringToFront();
cl3.bringToFront();
cl4.bringToFront();
snackbar_updated = Snackbar.make(cl, "Message", Snackbar.LENGTH_INDEFINITE);
snackbar_updated.setAction("Ok", new View.OnClickListener() {
@Override
public void onClick(View view) {
}
});
/** Snackbar message and action TextViews are placed inside a LinearLayout
*/
final Snackbar.SnackbarLayout snackBarLayout = (Snackbar.SnackbarLayout) snackbar_updated.getView();
for (int i = 0; i < snackBarLayout.getChildCount(); i++) {
View parent = snackBarLayout.getChildAt(i);
if (parent instanceof LinearLayout) {
((LinearLayout) parent).setRotation(180);
break;
}
}
snackbar_updated1 = Snackbar.make(cl1, "Message", Snackbar.LENGTH_INDEFINITE);
snackbar_updated1.setAction("Ok", new View.OnClickListener() {
@Override
public void onClick(View view) {
}
});
/** Snackbar message and action TextViews are placed inside a LinearLayout
*/
final Snackbar.SnackbarLayout snackBarLayout1 = (Snackbar.SnackbarLayout) snackbar_updated1.getView();
for (int i = 0; i < snackBarLayout1.getChildCount(); i++) {
View parent = snackBarLayout1.getChildAt(i);
if (parent instanceof LinearLayout) {
((LinearLayout) parent).setRotation(180);
break;
}
}
snackbar_updated2 = Snackbar.make(cl2, "Message", Snackbar.LENGTH_INDEFINITE);
snackbar_updated2.setAction("Ok", new View.OnClickListener() {
@Override
public void onClick(View view) {
}
});
snackbar_updated3 = Snackbar.make(cl3, "Message", Snackbar.LENGTH_INDEFINITE);
snackbar_updated3.setAction("Ok", new View.OnClickListener() {
@Override
public void onClick(View view) {
}
});
/** Snackbar message and action TextViews are placed inside a LinearLayout
*/
Snackbar.SnackbarLayout snackBarLayout3 = (Snackbar.SnackbarLayout) snackbar_updated3.getView();
for (int i = 0; i < snackBarLayout3.getChildCount(); i++) {
View parent = snackBarLayout3.getChildAt(i);
if (parent instanceof LinearLayout) {
((LinearLayout) parent).setRotation(180);
break;
}
}
snackbar_updated4 = Snackbar.make(cl4, "Message", Snackbar.LENGTH_INDEFINITE);
snackbar_updated4.setAction("Ok", new View.OnClickListener() {
@Override
public void onClick(View view) {
}
});
snackbar_ordinary = Snackbar.make(rl, "Message", Snackbar.LENGTH_INDEFINITE);
snackbar_ordinary.setAction("Ok", new View.OnClickListener() {
@Override
public void onClick(View view) {
}
});
rl.post(new Runnable() {
@Override
public void run() {
snackbar_updated.show();
rl.postDelayed(new Runnable() {
@Override
public void run() {
snackbar_updated1.show();
rl.postDelayed(new Runnable() {
@Override
public void run() {
snackbar_updated2.show();
rl.postDelayed(new Runnable() {
@Override
public void run() {
snackbar_updated3.show();
rl.postDelayed(new Runnable() {
@Override
public void run() {
snackbar_updated4.show();
rl.postDelayed(new Runnable() {
@Override
public void run() {
snackbar_ordinary.show();
}
}, 2000);
}
}, 2000);
}
}, 2000);
}
}, 2000);
}
}, 2000);
}
});
}
}
activity_main.xml:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
tools:context=".MainActivity"
android:orientation="vertical"
android:id="@+id/rl"
xmlns:tools="http://schemas.android.com/tools"
xmlns:android="http://schemas.android.com/apk/res/android">
<!-- Coordinator Layout used to position the SnackBar -->
<android.support.design.widget.CoordinatorLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/cl"
android:rotation="180"
android:layout_alignParentTop="true"
android:background="@android:color/transparent">
</android.support.design.widget.CoordinatorLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentTop="true"
android:orientation="vertical">
<android.support.design.widget.AppBarLayout
android:id="@+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:fitsSystemWindows="true">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:itemIconTint="#333"
app:itemTextColor="#333"
app:layout_collapseMode="pin"
app:layout_scrollFlags="scroll|enterAlways"
app:popupTheme="@style/ThemeOverlay.AppCompat.Dark"
app:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"/>
</android.support.design.widget.AppBarLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_below="@id/appbar"
android:layout_gravity="bottom">
<TextView
android:layout_width="match_parent"
android:layout_height="30dp"
android:id="@+id/tv_top"
android:text="Layout Top"
android:gravity="center"
android:textSize="15sp"
android:textColor="@android:color/white"
android:layout_alignParentTop="true"
android:background="@color/colorAccent">
</TextView>
<!-- Coordinator Layout used to position the SnackBar -->
<android.support.design.widget.CoordinatorLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/cl1"
android:rotation="180"
android:layout_below="@id/tv_top"
android:background="@android:color/transparent">
</android.support.design.widget.CoordinatorLayout>
<!-- Coordinator Layout used to position the SnackBar -->
<android.support.design.widget.CoordinatorLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/cl2"
android:paddingBottom="75dp"
android:layout_centerInParent="true"
android:background="@android:color/transparent">
</android.support.design.widget.CoordinatorLayout>
<!-- Coordinator Layout used to position the SnackBar -->
<TextView
android:layout_width="match_parent"
android:layout_height="30dp"
android:id="@+id/tv_center"
android:text="Center"
android:gravity="center"
android:textSize="15sp"
android:layout_centerInParent="true"
android:textColor="@android:color/white"
android:background="@color/colorAccent">
</TextView>
<android.support.design.widget.CoordinatorLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/cl3"
android:rotation="180"
android:paddingBottom="75dp"
android:layout_centerInParent="true"
android:background="@android:color/transparent">
</android.support.design.widget.CoordinatorLayout>
<TextView
android:layout_width="match_parent"
android:layout_height="30dp"
android:id="@+id/tv_bottom"
android:text="Layout Bottom"
android:gravity="center"
android:textSize="15sp"
android:textColor="@android:color/white"
android:layout_alignParentBottom="true"
android:background="@color/colorAccent">
</TextView>
<!-- Coordinator Layout used to position the SnackBar -->
<android.support.design.widget.CoordinatorLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/cl4"
android:layout_above="@id/tv_bottom"
android:background="@android:color/transparent">
</android.support.design.widget.CoordinatorLayout>
</RelativeLayout>
</RelativeLayout>
</RelativeLayout>
6) Result:
回答5:
Kotlin-
val snackBarView = Snackbar.make(view, "SnackBar Message" , Snackbar.LENGTH_LONG)
val view = snackBarView.view
val params = view.layoutParams as FrameLayout.LayoutParams
params.gravity = Gravity.TOP
view.layoutParams = params
view.background = ContextCompat.getDrawable(context,R.drawable.custom_drawable) // for custom background
snackBarView.animationMode = BaseTransientBottomBar.ANIMATION_MODE_FADE
snackBarView.show()
snackBarView.animationMode = BaseTransientBottomBar.ANIMATION_MODE_FADE
Above line will resolve the animation issue.
Alternate solution- snackBarView.anchorView = mention viewId above whom you want to show SnackBar
回答6:
2 years later, here's my solution..
Setting the Top and Bottom Margin changes the effect result,... I have tried to add as much customization options as i could, Overriding the animation is another option not written here.
Thanks to everyone's answers on several questions...
{
// usage for setSnackBar
int view = R.id.toolbar;
String snackMessage = "";
boolean useAction = false;
Runnable ifUseActionRunnable = null;
String actionText = "";
int leftMargin = 0;
int topMargin = 0;
int rightMargin = 0;
int bottomMargin = 0;
int backgroundColour = Color.BLACK;
int textColor = Color.WHITE;
int duration = Snackbar.LENGTH_LONG;
setSnackBar(view, snackMessage, useAction, ifUseActionRunnable, actionText, leftMargin, topMargin, rightMargin, bottomMargin, backgroundColour, textColor, duration);
}
Snackbar snb;
public void setSnackBar(int targetView, String snackMessage, boolean useAction, final Runnable ifUseActionRunnable, String actionText , int leftMargin, int topMargin, int rightMargin, int bottomMargin, int backgroundColour, int textColor, int duration)
{
snb = Snackbar.make(findViewById(targetView), snackMessage, duration);
View view = snb.getView();
view.setBackgroundColor(backgroundColour);
snb.setActionTextColor(textColor);
FrameLayout.LayoutParams params =(FrameLayout.LayoutParams)view.getLayoutParams();
params.gravity = Gravity.CENTER_HORIZONTAL | Gravity.TOP;
params.setMargins(leftMargin, topMargin, rightMargin, bottomMargin);
view.setLayoutParams(params);
if (useAction)
{
snb.setAction(actionText, new View.OnClickListener(){
@Override
public void onClick(View p1)
{
ifUseActionRunnable.run();
}
});
}
if (snb.isShown())
{
snb.dismiss();
snb.show();
}
else
{
snb.show();
}
}
来源：https://stackoverflow.com/questions/31746300/how-to-show-snackbar-at-top-of-the-screen