/*
* Copyright (C) 2007 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.widget;
import static com.android.internal.util.Preconditions.checkNotNull;
import static com.android.internal.util.Preconditions.checkState;
import android.annotation.IntDef;
import android.annotation.NonNull;
import android.annotation.Nullable;
import android.annotation.StringRes;
import android.app.INotificationManager;
import android.app.ITransientNotification;
import android.app.ITransientNotificationCallback;
import android.compat.Compatibility;
import android.compat.annotation.ChangeId;
import android.compat.annotation.EnabledAfter;
import android.compat.annotation.UnsupportedAppUsage;
import android.content.Context;
import android.content.res.Resources;
import android.graphics.drawable.Drawable;
import android.os.Binder;
import android.os.Build;
import android.os.Handler;
import android.os.IBinder;
import android.os.Looper;
import android.os.Message;
import android.os.RemoteException;
import android.os.ServiceManager;
import android.util.Log;
import android.view.View;
import android.view.WindowManager;
import android.view.accessibility.IAccessibilityManager;
import com.android.internal.annotations.GuardedBy;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.ref.WeakReference;
import java.util.ArrayList;
import java.util.List;
/**
* A toast is a view containing a quick little message for the user. The toast class
* helps you create and show those.
* {@more}
*
* <p>
* When the view is shown to the user, appears as a floating view over the
* application. It will never receive focus. The user will probably be in the
* middle of typing something else. The idea is to be as unobtrusive as
* possible, while still showing the user the information you want them to see.
* Two examples are the volume control, and the brief message saying that your
* settings have been saved.
* <p>
* The easiest way to use this class is to call one of the static methods that constructs
* everything you need and returns a new Toast object.
* <p>
* Note that
* <a href="{@docRoot}reference/com/google/android/material/snackbar/Snackbar">Snackbars</a> are
* preferred for brief messages while the app is in the foreground.
* <p>
* Note that toasts being sent from the background are rate limited, so avoid sending such toasts
* in quick succession.
* <p>
* Starting with Android 12 (API level 31), apps targeting Android 12 or newer will have
* their toasts limited to two lines.
*
* <div class="special reference">
* <h3>Developer Guides</h3>
* <p>For information about creating Toast notifications, read the
* <a href="{@docRoot}guide/topics/ui/notifiers/toasts.html">Toast Notifications</a> developer
* guide.</p>
* </div>
*/
public class Toast {
static final String TAG = "Toast";
static final boolean localLOGV = false;
/** @hide */
@IntDef(prefix = { "LENGTH_" }, value = {
LENGTH_SHORT,
LENGTH_LONG
})
@Retention(RetentionPolicy.SOURCE)
public @interface Duration {}
/**
* Show the view or text notification for a short period of time. This time
* could be user-definable. This is the default.
* @see #setDuration
*/
public static final int LENGTH_SHORT = 0;
/**
* Show the view or text notification for a long period of time. This time
* could be user-definable.
* @see #setDuration
*/
public static final int LENGTH_LONG = 1;
/**
* Text toasts will be rendered by SystemUI instead of in-app, so apps can't circumvent
* background custom toast restrictions.
*/
@ChangeId
@EnabledAfter(targetSdkVersion = Build.VERSION_CODES.Q)
private static final long CHANGE_TEXT_TOASTS_IN_THE_SYSTEM = 147798919L;
private final Binder mToken;
private final Context mContext;
private final Handler mHandler;
@UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P)
final TN mTN;
@UnsupportedAppUsage
int mDuration;
/**
* This is also passed to {@link TN} object, where it's also accessed with itself as its own
* lock.
*/
@GuardedBy("mCallbacks")
private final List<Callback> mCallbacks;
/**
* View to be displayed, in case this is a custom toast (e.g. not created with {@link
* #makeText(Context, int, int)} or its variants).
*/
@Nullable
private View mNextView;
/**
* Text to be shown, in case this is NOT a custom toast (e.g. created with {@link
* #makeText(Context, int, int)} or its variants).
*/
@Nullable
private CharSequence mText;
/**
* Construct an empty Toast object. You must call {@link #setView} before you
* can call {@link #show}.
*
* @param context The context to use. Usually your {@link android.app.Application}
* or {@link android.app.Activity} object.
*/
public Toast(Context context) {
this(context, null);
}
/**
* Constructs an empty Toast object. If looper is null, Looper.myLooper() is used.
* @hide
*/
public Toast(@NonNull Context context, @Nullable Looper looper) {
mContext = context;
mToken = new Binder();
looper = getLooper(looper);
mHandler = new Handler(looper);
mCallbacks = new ArrayList<>();
mTN = new TN(context, context.getPackageName(), mToken,
mCallbacks, looper);
mTN.mY = context.getResources().getDimensionPixelSize(
com.android.internal.R.dimen.toast_y_offset);
mTN.mGravity = context.getResources().getInteger(
com.android.internal.R.integer.config_toastDefaultGravity);
}
private Looper getLooper(@Nullable Looper looper) {
if (looper != null) {
return looper;
}
return checkNotNull(Looper.myLooper(),
"Can't toast on a thread that has not called Looper.prepare()");
}
/**
* Show the view for the specified duration.
*
* <p>Note that toasts being sent from the background are rate limited, so avoid sending such
* toasts in quick succession.
*/
public void show() {
if (Compatibility.isChangeEnabled(CHANGE_TEXT_TOASTS_IN_THE_SYSTEM)) {
checkState(mNextView != null || mText != null, "You must either set a text or a view");
} else {
if (mNextView == null) {
throw new RuntimeException("setView must have been called");
}
}
INotificationManager service = getService();
String pkg = mContext.getOpPackageName();
TN tn = mTN;
tn.mNextView = new WeakReference<>(mNextView);
final boolean isUiContext = mContext.isUiContext();
final int displayId = mContext.getDisplayId();
try {
if (Compatibility.isChangeEnabled(CHANGE_TEXT_TOASTS_IN_THE_SYSTEM)) {
if (mNextView != null) {
// It's a custom toast
service.enqueueToast(pkg, mToken, tn, mDuration, isUiContext, displayId);
} else {
// It's a text toast
ITransientNotificationCallback callback =
new CallbackBinder(mCallbacks, mHandler);
service.enqueueTextToast(pkg, mToken, mText, mDuration, isUiContext, displayId,
callback);
}
} else {
service.enqueueToast(pkg, mToken, tn, mDuration, isUiContext, displayId);
}
} catch (RemoteException e) {
// Empty
}
}
/**
* Close the view if it's showing, or don't show it if it isn't showing yet.
* You do not normally have to call this. Normally view will disappear on its own
* after the appropriate duration.
*/
public void cancel() {
if (Compatibility.isChangeEnabled(CHANGE_TEXT_TOASTS_IN_THE_SYSTEM)
&& mNextView == null) {
try {
getService().cancelToast(mContext.getOpPackageName(), mToken);
} catch (RemoteException e) {
// Empty
}
} else {
mTN.cancel();
}
}
/**
* Set the view to show.
*
* @see #getView
* @deprecated Custom toast views are deprecated. Apps can create a standard text toast with the
* {@link #makeText(Context, CharSequence, int)} method, or use a
* <a href="{@docRoot}reference/com/google/android/material/snackbar/Snackbar">Snackbar</a>
* when in the foreground. Starting from Android {@link Build.VERSION_CODES#R}, apps
* targeting API level {@link Build.VERSION_CODES#R} or higher that are in the background
* will not have custom toast views displayed.
*/
@Deprecated
public void setView(View view) {
mNextView = view;
}
/**
* Return the view.
*
* <p>Toasts constructed with {@link #Toast(Context)} that haven't called {@link #setView(View)}
* with a non-{@code null} view will return {@code null} here.
*
* <p>Starting from Android {@link Build.VERSION_CODES#R}, in apps targeting API level {@link
* Build.VERSION_CODES#R} or higher, toasts constructed with {@link #makeText(Context,
* CharSequence, int)} or its variants will also return {@code null} here unless they had called
* {@link #setView(View)} with a non-{@code null} view. If you want to be notified when the
* toast is shown or hidden, use {@link #addCallback(Callback)}.
*
* @see #setView
* @deprecated Custom toast views are deprecated. Apps can create a standard text toast with the
* {@link #makeText(Context, CharSequence, int)} method, or use a
* <a href="{@docRoot}reference/com/google/android/material/snackbar/Snackbar">Snackbar</a>
* when in the foreground. Starting from Android {@link Build.VERSION_CODES#R}, apps
* targeting API level {@link Build.VERSION_CODES#R} or higher that are in the background
* will not have custom toast views displayed.
*/
@Deprecated
@Nullable public View getView() {
return mNextView;
}
/**
* Set how long to show the view for.
* @see #LENGTH_SHORT
* @see #LENGTH_LONG
*/
public void setDuration(@Duration int duration) {
mDuration = duration;
mTN.mDuration = duration;
}
/**
* Return the duration.
* @see #setDuration
*/
@Duration
public int getDuration() {
return mDuration;
}
/**
* Set the margins of the view.
*
* <p><strong>Warning:</strong> Starting from Android {@link Build.VERSION_CODES#R}, for apps
* targeting API level {@link Build.VERSION_CODES#R} or higher, this method is a no-op when
* called on text toasts.
*
* @param horizontalMargin The horizontal margin, in percentage of the
* container width, between the container's edges and the
* notification
* @param verticalMargin The vertical margin, in percentage of the
* container height, between the container's edges and the
* notification
*/
public void setMargin(float horizontalMargin, float verticalMargin) {
if (isSystemRenderedTextToast()) {
Log.e(TAG, "setMargin() shouldn't be called on text toasts, the values won't be used");
}
mTN.mHorizontalMargin = horizontalMargin;
mTN.mVerticalMargin = verticalMargin;
}
/**
* Return the horizontal margin.
*
* <p><strong>Warning:</strong> Starting from Android {@link Build.VERSION_CODES#R}, for apps
* targeting API level {@link Build.VERSION_CODES#R} or higher, this method shouldn't be called
* on text toasts as its return value may not reflect actual value since text toasts are not
* rendered by the app anymore.
*/
public float getHorizontalMargin() {
if (isSystemRenderedTextToast()) {
Log.e(TAG, "getHorizontalMargin() shouldn't be called on text toasts, the result may "
+ "not reflect actual values.");
}
return mTN.mHorizontalMargin;
}
/**
* Return the vertical margin.
*
* <p><strong>Warning:</strong> Starting from Android {@link Build.VERSION_CODES#R}, for apps
* targeting API level {@link Build.VERSION_CODES#R} or higher, this method shouldn't be called
* on text toasts as its return value may not reflect actual value since text toasts are not
* rendered by the app anymore.
*/
public float getVerticalMargin() {
if (isSystemRenderedTextToast()) {
Log.e(TAG, "getVerticalMargin() shouldn't be called on text toasts, the result may not"
+ " reflect actual values.");
}
return mTN.mVerticalMargin;
}
/**
* Set the location at which the notification should appear on the screen.
*
* <p><strong>Warning:</strong> Starting from Android {@link Build.VERSION_CODES#R}, for apps
* targeting API level {@link Build.VERSION_CODES#R} or higher, this method is a no-op when
* called on text toasts.
*
* @see android.view.Gravity
* @see #getGravity
*/
public void setGravity(int gravity, int xOffset, int yOffset) {
if (isSystemRenderedTextToast()) {
Log.e(TAG, "setGravity() shouldn't be called on text toasts, the values won't be used");
}
mTN.mGravity = gravity;
mTN.mX = xOffset;
mTN.mY = yOffset;
}
/**
* Get the location at which the notification should appear on the screen.
*
* <p><strong>Warning:</strong> Starting from Android {@link Build.VERSION_CODES#R}, for apps
* targeting API level {@link Build.VERSION_CODES#R} or higher, this method shouldn't be called
* on text toasts as its return value may not reflect actual value since text toasts are not
* rendered by the app anymore.
*
* @see android.view.Gravity
* @see #getGravity
*/
public int getGravity() {
if (isSystemRenderedTextToast()) {
Log.e(TAG, "getGravity() shouldn't be called on text toasts, the result may not reflect"
+ " actual values.");
}
return mTN.mGravity;
}
/**
* Return the X offset in pixels to apply to the gravity's location.
*
* <p><strong>Warning:</strong> Starting from Android {@link Build.VERSION_CODES#R}, for apps
* targeting API level {@link Build.VERSION_CODES#R} or higher, this method shouldn't be called
* on text toasts as its return value may not reflect actual value since text toasts are not
* rendered by the app anymore.
*/
public int getXOffset() {
if (isSystemRenderedTextToast()) {
Log.e(TAG, "getXOffset() shouldn't be called on text toasts, the result may not reflect"
+ " actual values.");
}
return mTN.mX;
}
/**
* Return the Y offset in pixels to apply to the gravity's location.
*
* <p><strong>Warning:</strong> Starting from Android {@link Build.VERSION_CODES#R}, for apps
* targeting API level {@link Build.VERSION_CODES#R} or higher, this method shouldn't be called
* on text toasts as its return value may not reflect actual value since text toasts are not
* rendered by the app anymore.
*/
public int getYOffset() {
if (isSystemRenderedTextToast()) {
Log.e(TAG, "getYOffset() shouldn't be called on text toasts, the result may not reflect"
+ " actual values.");
}
return mTN.mY;
}
private boolean isSystemRenderedTextToast() {
return Compatibility.isChangeEnabled(CHANGE_TEXT_TOASTS_IN_THE_SYSTEM) && mNextView == null;
}
/**
* Adds a callback to be notified when the toast is shown or hidden.
*
* Note that if the toast is blocked for some reason you won't get a call back.
*
* @see #removeCallback(Callback)
*/
public void addCallback(@NonNull Callback callback) {
checkNotNull(callback);
synchronized (mCallbacks) {
mCallbacks.add(callback);
}
}
/**
* Removes a callback previously added with {@link #addCallback(Callback)}.
*/
public void removeCallback(@NonNull Callback callback) {
synchronized (mCallbacks) {
mCallbacks.remove(callback);
}
}
/**
* Gets the LayoutParams for the Toast window.
* @hide
*/
@UnsupportedAppUsage
@Nullable public WindowManager.LayoutParams getWindowParams() {
if (Compatibility.isChangeEnabled(CHANGE_TEXT_TOASTS_IN_THE_SYSTEM)) {
if (mNextView != null) {
// Custom toasts
return mTN.mParams;
} else {
// Text toasts
return null;
}
} else {
// Text and custom toasts are app-rendered
return mTN.mParams;
}
}
/**
* Make a standard toast that just contains text.
*
* @param context The context to use. Usually your {@link android.app.Application}
* or {@link android.app.Activity} object.
* @param text The text to show. Can be formatted text.
* @param duration How long to display the message. Either {@link #LENGTH_SHORT} or
* {@link #LENGTH_LONG}
*
*/
public static Toast makeText(Context context, CharSequence text, @Duration int duration) {
return makeText(context, null, text, duration);
}
/**
* Make a standard toast to display using the specified looper.
* If looper is null, Looper.myLooper() is used.
*
* @hide
*/
public static Toast makeText(@NonNull Context context, @Nullable Looper looper,
@NonNull CharSequence text, @Duration int duration) {
Toast result = new Toast(context, looper);
if (Compatibility.isChangeEnabled(CHANGE_TEXT_TOASTS_IN_THE_SYSTEM)) {
result.mText = text;
} else {
result.mNextView = ToastPresenter.getTextToastView(context, text);
}
result.mDuration = duration;
return result;
}
/**
* Make a standard toast with an icon to display using the specified looper.
* If looper is null, Looper.myLooper() is used.
*
* The toast will be a custom view that's rendered by the app (instead of by SystemUI).
* In Android version R and above, non-system apps can only render the toast
* when it's in the foreground.
*
* @hide
*/
public static Toast makeCustomToastWithIcon(@NonNull Context context, @Nullable Looper looper,
@NonNull CharSequence text, @Duration int duration, @NonNull Drawable icon) {
if (icon == null) {
throw new IllegalArgumentException("Drawable icon should not be null "
+ "for makeCustomToastWithIcon");
}
Toast result = new Toast(context, looper);
result.mNextView = ToastPresenter.getTextToastViewWithIcon(context, text, icon);
result.mDuration = duration;
return result;
}
/**
* Make a standard toast that just contains text from a resource.
*
* @param context The context to use. Usually your {@link android.app.Application}
* or {@link android.app.Activity} object.
* @param resId The resource id of the string resource to use. Can be formatted text.
* @param duration How long to display the message. Either {@link #LENGTH_SHORT} or
* {@link #LENGTH_LONG}
*
* @throws Resources.NotFoundException if the resource can't be found.
*/
public static Toast makeText(Context context, @StringRes int resId, @Duration int duration)
throws Resources.NotFoundException {
return makeText(context, context.getResources().getText(resId), duration);
}
/**
* Update the text in a Toast that was previously created using one of the makeText() methods.
* @param resId The new text for the Toast.
*/
public void setText(@StringRes int resId) {
setText(mContext.getText(resId));
}
/**
* Update the text in a Toast that was previously created using one of the makeText() methods.
* @param s The new text for the Toast.
*/
public void setText(CharSequence s) {
if (Compatibility.isChangeEnabled(CHANGE_TEXT_TOASTS_IN_THE_SYSTEM)) {
if (mNextView != null) {
throw new IllegalStateException(
"Text provided for custom toast, remove previous setView() calls if you "
+ "want a text toast instead.");
}
mText = s;
} else {
if (mNextView == null) {
throw new RuntimeException("This Toast was not created with Toast.makeText()");
}
TextView tv = mNextView.findViewById(com.android.internal.R.id.message);
if (tv == null) {
throw new RuntimeException("This Toast was not created with Toast.makeText()");
}
tv.setText(s);
}
}
// =======================================================================================
// All the gunk below is the interaction with the Notification Service, which handles
// the proper ordering of these system-wide.
// =======================================================================================
@UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P)
private static INotificationManager sService;
@UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P)
static private INotificationManager getService() {
if (sService != null) {
return sService;
}
sService = INotificationManager.Stub.asInterface(
ServiceManager.getService(Context.NOTIFICATION_SERVICE));
return sService;
}
private static class TN extends ITransientNotification.Stub {
@UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P)
private final WindowManager.LayoutParams mParams;
private static final int SHOW = 0;
private static final int HIDE = 1;
private static final int CANCEL = 2;
final Handler mHandler;
@UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P)
int mGravity;
int mX;
@UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P)
int mY;
float mHorizontalMargin;
float mVerticalMargin;
@UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P)
View mView;
@UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P)
WeakReference<View> mNextView;
int mDuration;
WindowManager mWM;
final String mPackageName;
final Binder mToken;
private final ToastPresenter mPresenter;
@GuardedBy("mCallbacks")
private final WeakReference<List<Callback>> mCallbacks;
/**
* Creates a {@link ITransientNotification} object.
*
* The parameter {@code callbacks} is not copied and is accessed with itself as its own
* lock.
*/
TN(Context context, String packageName, Binder token, List<Callback> callbacks,
@Nullable Looper looper) {
IAccessibilityManager accessibilityManager = IAccessibilityManager.Stub.asInterface(
ServiceManager.getService(Context.ACCESSIBILITY_SERVICE));
mPresenter = new ToastPresenter(context, accessibilityManager, getService(),
packageName);
mParams = mPresenter.getLayoutParams();
mPackageName = packageName;
mToken = token;
mCallbacks = new WeakReference<>(callbacks);
mHandler = new Handler(looper, null) {
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case SHOW: {
IBinder token = (IBinder) msg.obj;
handleShow(token);
break;
}
case HIDE: {
handleHide();
// Don't do this in handleHide() because it is also invoked by
// handleShow()
mNextView = null;
break;
}
case CANCEL: {
handleHide();
// Don't do this in handleHide() because it is also invoked by
// handleShow()
mNextView = null;
try {
getService().cancelToast(mPackageName, mToken);
} catch (RemoteException e) {
}
break;
}
}
}
};
}
private List<Callback> getCallbacks() {
synchronized (mCallbacks) {
if (mCallbacks.get() != null) {
return new ArrayList<>(mCallbacks.get());
} else {
return new ArrayList<>();
}
}
}
/**
* schedule handleShow into the right thread
*/
@Override
@UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P, trackingBug = 115609023)
public void show(IBinder windowToken) {
if (localLOGV) Log.v(TAG, "SHOW: " + this);
mHandler.obtainMessage(SHOW, windowToken).sendToTarget();
}
/**
* schedule handleHide into the right thread
*/
@Override
public void hide() {
if (localLOGV) Log.v(TAG, "HIDE: " + this);
mHandler.obtainMessage(HIDE).sendToTarget();
}
public void cancel() {
if (localLOGV) Log.v(TAG, "CANCEL: " + this);
mHandler.obtainMessage(CANCEL).sendToTarget();
}
public void handleShow(IBinder windowToken) {
if (localLOGV) Log.v(TAG, "HANDLE SHOW: " + this + " mView=" + mView
+ " mNextView=" + mNextView);
// If a cancel/hide is pending - no need to show - at this point
// the window token is already invalid and no need to do any work.
if (mHandler.hasMessages(CANCEL) || mHandler.hasMessages(HIDE)) {
return;
}
if (mNextView != null && mView != mNextView.get()) {
// remove the old view if necessary
handleHide();
mView = mNextView.get();
if (mView != null) {
mPresenter.show(mView, mToken, windowToken, mDuration, mGravity, mX, mY,
mHorizontalMargin, mVerticalMargin,
new CallbackBinder(getCallbacks(), mHandler));
}
}
}
@UnsupportedAppUsage
public void handleHide() {
if (localLOGV) Log.v(TAG, "HANDLE HIDE: " + this + " mView=" + mView);
if (mView != null) {
checkState(mView == mPresenter.getView(),
"Trying to hide toast view different than the last one displayed");
mPresenter.hide(new CallbackBinder(getCallbacks(), mHandler));
mView = null;
}
}
}
/**
* Callback object to be called when the toast is shown or hidden.
*
* @see #makeText(Context, CharSequence, int)
* @see #addCallback(Callback)
*/
public abstract static class Callback {
/**
* Called when the toast is displayed on the screen.
*/
public void onToastShown() {}
/**
* Called when the toast is hidden.
*/
public void onToastHidden() {}
}
private static class CallbackBinder extends ITransientNotificationCallback.Stub {
private final Handler mHandler;
@GuardedBy("mCallbacks")
private final List<Callback> mCallbacks;
/**
* Creates a {@link ITransientNotificationCallback} object.
*
* The parameter {@code callbacks} is not copied and is accessed with itself as its own
* lock.
*/
private CallbackBinder(List<Callback> callbacks, Handler handler) {
mCallbacks = callbacks;
mHandler = handler;
}
@Override
public void onToastShown() {
mHandler.post(() -> {
for (Callback callback : getCallbacks()) {
callback.onToastShown();
}
});
}
@Override
public void onToastHidden() {
mHandler.post(() -> {
for (Callback callback : getCallbacks()) {
callback.onToastHidden();
}
});
}
private List<Callback> getCallbacks() {
synchronized (mCallbacks) {
return new ArrayList<>(mCallbacks);
}
}
}
}