@Override
public void onAutofillEvent(@NonNull View view, int event) {
    if (view instanceof AutoCompleteTextView) {
        switch (event) {
            case AutofillManager.AutofillCallback.EVENT_INPUT_UNAVAILABLE:
                // no break on purpose
            case AutofillManager.AutofillCallback.EVENT_INPUT_HIDDEN:
                if (!mAutofillReceived) {
                    ((AutoCompleteTextView) view).showDropDown();
                }
                break;
            case AutofillManager.AutofillCallback.EVENT_INPUT_SHOWN:
                mAutofillReceived = true;
                ((AutoCompleteTextView) view).setAdapter(null);
                break;
            default:
                Log.d(TAG, "Unexpected callback: " + event);
        }
    }
}
 

private void finishIt() {
    StringBuilder message = new StringBuilder(getString(R.string.message_finished))
            .append("\n\n");
    for (int i = 0; i < mSteps.length; i++) {
        TextView label = (TextView) mSteps[i].getChildAt(0);
        EditText input = (EditText) mSteps[i].getChildAt(1);
        message.append(getString(R.string.message_step_description, label.getText(), input.getText()))
                .append('\n');
    }
    mStatus.setText(message.toString());
    mContainer.removeAllViews();
    mFinished = true;
    AutofillManager afm = getSystemService(AutofillManager.class);
    if (afm != null) {
        afm.commit();
    }
    updateButtons();
}
 

@Override
public void onAutofillEvent(@NonNull View view, int event) {
    if (view instanceof AutoCompleteTextView) {
        switch (event) {
            case AutofillManager.AutofillCallback.EVENT_INPUT_UNAVAILABLE:
                // no break on purpose
            case AutofillManager.AutofillCallback.EVENT_INPUT_HIDDEN:
                if (!mAutofillReceived) {
                    ((AutoCompleteTextView) view).showDropDown();
                }
                break;
            case AutofillManager.AutofillCallback.EVENT_INPUT_SHOWN:
                mAutofillReceived = true;
                ((AutoCompleteTextView) view).setAdapter(null);
                break;
            default:
                Log.d(TAG, "Unexpected callback: " + event);
        }
    }
}
 

private void finishIt() {
    StringBuilder message = new StringBuilder(getString(R.string.message_finished))
            .append("\n\n");
    for (int i = 0; i < mSteps.length; i++) {
        TextView label = (TextView) mSteps[i].getChildAt(0);
        EditText input = (EditText) mSteps[i].getChildAt(1);
        message.append(getString(R.string.message_step_description, label.getText(), input.getText()))
                .append('\n');
    }
    mStatus.setText(message.toString());
    mContainer.removeAllViews();
    mFinished = true;
    AutofillManager afm = getSystemService(AutofillManager.class);
    if (afm != null) {
        afm.commit();
    }
    updateButtons();
}
 

public void dismiss() {
  popupWindow.dismiss();
  variantPopup.dismiss();
  recentEmoji.persist();
  variantEmoji.persist();

  emojiResultReceiver.setReceiver(null);

  if (originalImeOptions != -1) {
    editText.setImeOptions(originalImeOptions);
    final InputMethodManager inputMethodManager = (InputMethodManager) context.getSystemService(Context.INPUT_METHOD_SERVICE);

    if (inputMethodManager != null) {
      inputMethodManager.restartInput(editText);
    }

    if (SDK_INT >= O) {
      final AutofillManager autofillManager = context.getSystemService(AutofillManager.class);
      if (autofillManager != null) {
        autofillManager.cancel();
      }
    }
  }
}
 

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.login_with_autocomplete_activity);

    TextView title = findViewById(R.id.standard_login_header);
    title.setText(R.string.navigation_button_anti_pattern_callbackless_autocomplete_login_label);

    InfoButton info = findViewById(R.id.imageButton);
    info.setInfoText(getString(R.string.anti_pattern_callbackless_autocomplete_login_info));


    mLoginButton = findViewById(R.id.login);
    mClearButton = findViewById(R.id.clear);
    mUsernameAutoCompleteField = findViewById(R.id.usernameField);
    mPasswordField = findViewById(R.id.passwordField);
    mLoginButton.setOnClickListener((v) -> login());
    mClearButton.setOnClickListener((v) -> {
        AutofillManager afm = getSystemService(AutofillManager.class);
        if (afm != null) {
            afm.cancel();
        }
        resetFields();
    });
    ArrayAdapter<CharSequence> mockAutocompleteAdapter = ArrayAdapter.createFromResource
            (this, R.array.mock_autocomplete_sign_in_suggestions,
                    android.R.layout.simple_dropdown_item_1line);
    mUsernameAutoCompleteField.setAdapter(mockAutocompleteAdapter);
    mUsernameAutoCompleteField.setThreshold(1);

    // Show it right away
    mUsernameAutoCompleteField.setOnFocusChangeListener((v, hasFocus) -> {
        if (hasFocus) {
            mUsernameAutoCompleteField.showDropDown();
        }
    });
}
 

@Override
public AutofillManager createService(ContextImpl ctx) throws ServiceNotFoundException {
    // Get the services without throwing as this is an optional feature
    IBinder b = ServiceManager.getService(Context.AUTOFILL_MANAGER_SERVICE);
    IAutoFillManager service = IAutoFillManager.Stub.asInterface(b);
    return new AutofillManager(ctx.getOuterContext(), service);
}
 

private void setCheckedId(@IdRes int id) {
    boolean changed = id != mCheckedId;
    mCheckedId = id;

    if (mOnCheckedChangeListener != null) {
        mOnCheckedChangeListener.onCheckedChanged(this, mCheckedId);
    }
    if (changed) {
        final AutofillManager afm = mContext.getSystemService(AutofillManager.class);
        if (afm != null) {
            afm.notifyValueChanged(this);
        }
    }
}
 

public TimePicker(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
    super(context, attrs, defStyleAttr, defStyleRes);

    // DatePicker is important by default, unless app developer overrode attribute.
    if (getImportantForAutofill() == IMPORTANT_FOR_AUTOFILL_AUTO) {
        setImportantForAutofill(IMPORTANT_FOR_AUTOFILL_YES);
    }

    final TypedArray a = context.obtainStyledAttributes(
            attrs, R.styleable.TimePicker, defStyleAttr, defStyleRes);
    final boolean isDialogMode = a.getBoolean(R.styleable.TimePicker_dialogMode, false);
    final int requestedMode = a.getInt(R.styleable.TimePicker_timePickerMode, MODE_SPINNER);
    a.recycle();

    if (requestedMode == MODE_CLOCK && isDialogMode) {
        // You want MODE_CLOCK? YOU CAN'T HANDLE MODE_CLOCK! Well, maybe
        // you can depending on your screen size. Let's check...
        mMode = context.getResources().getInteger(R.integer.time_picker_mode);
    } else {
        mMode = requestedMode;
    }

    switch (mMode) {
        case MODE_CLOCK:
            mDelegate = new TimePickerClockDelegate(
                    this, context, attrs, defStyleAttr, defStyleRes);
            break;
        case MODE_SPINNER:
        default:
            mDelegate = new TimePickerSpinnerDelegate(
                    this, context, attrs, defStyleAttr, defStyleRes);
            break;
    }
    mDelegate.setAutoFillChangeListener((v, h, m) -> {
        final AutofillManager afm = context.getSystemService(AutofillManager.class);
        if (afm != null) {
            afm.notifyValueChanged(this);
        }
    });
}
 

/**
 * <p>Changes the checked state of this button.</p>
 *
 * @param checked true to check the button, false to uncheck it
 */
@Override
public void setChecked(boolean checked) {
    if (mChecked != checked) {
        mCheckedFromResource = false;
        mChecked = checked;
        refreshDrawableState();
        notifyViewAccessibilityStateChangedIfNeeded(
                AccessibilityEvent.CONTENT_CHANGE_TYPE_UNDEFINED);

        // Avoid infinite recursions if setChecked() is called from a listener
        if (mBroadcasting) {
            return;
        }

        mBroadcasting = true;
        if (mOnCheckedChangeListener != null) {
            mOnCheckedChangeListener.onCheckedChanged(this, mChecked);
        }
        if (mOnCheckedChangeWidgetListener != null) {
            mOnCheckedChangeWidgetListener.onCheckedChanged(this, mChecked);
        }
        final AutofillManager afm = mContext.getSystemService(AutofillManager.class);
        if (afm != null) {
            afm.notifyValueChanged(this);
        }

        mBroadcasting = false;
    }
}
 

void selectionChanged() {
    // We're about to post or run the selection notifier, so we don't need
    // a pending notifier.
    mPendingSelectionNotifier = null;

    if (mOnItemSelectedListener != null
            || AccessibilityManager.getInstance(mContext).isEnabled()) {
        if (mInLayout || mBlockLayoutRequests) {
            // If we are in a layout traversal, defer notification
            // by posting. This ensures that the view tree is
            // in a consistent state and is able to accommodate
            // new layout or invalidate requests.
            if (mSelectionNotifier == null) {
                mSelectionNotifier = new SelectionNotifier();
            } else {
                removeCallbacks(mSelectionNotifier);
            }
            post(mSelectionNotifier);
        } else {
            dispatchOnItemSelected();
        }
    }
    // Always notify AutoFillManager - it will return right away if autofill is disabled.
    final AutofillManager afm = mContext.getSystemService(AutofillManager.class);
    if (afm != null) {
        afm.notifyValueChanged(this);
    }
}
 

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.login_with_autocomplete_activity);

    TextView title = findViewById(R.id.standard_login_header);
    title.setText(R.string.navigation_button_anti_pattern_callbackless_autocomplete_login_label);

    InfoButton info = findViewById(R.id.imageButton);
    info.setInfoText(getString(R.string.anti_pattern_callbackless_autocomplete_login_info));


    mLoginButton = findViewById(R.id.login);
    mClearButton = findViewById(R.id.clear);
    mUsernameAutoCompleteField = findViewById(R.id.usernameField);
    mPasswordField = findViewById(R.id.passwordField);
    mLoginButton.setOnClickListener((v) -> login());
    mClearButton.setOnClickListener((v) -> {
        AutofillManager afm = getSystemService(AutofillManager.class);
        if (afm != null) {
            afm.cancel();
        }
        resetFields();
    });
    ArrayAdapter<CharSequence> mockAutocompleteAdapter = ArrayAdapter.createFromResource
            (this, R.array.mock_autocomplete_sign_in_suggestions,
                    android.R.layout.simple_dropdown_item_1line);
    mUsernameAutoCompleteField.setAdapter(mockAutocompleteAdapter);
    mUsernameAutoCompleteField.setThreshold(1);

    // Show it right away
    mUsernameAutoCompleteField.setOnFocusChangeListener((v, hasFocus) -> {
        if (hasFocus) {
            mUsernameAutoCompleteField.showDropDown();
        }
    });
}
 

@Override
public void onFocusChange(View view, /*hasFocus*/ boolean b) {
    switch (view.getId()) {
        case R.id.username:
        case R.id.password:
            //自动填充服务积极调用
            if (b && Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                AutofillManager afm = getSystemService(AutofillManager.class);
                if (afm != null) afm.requestAutofill(view);
            }
            break;
        default:
    }
}
 

public CustomVirtualView(Context context, AttributeSet attrs, int defStyleAttr,
        int defStyleRes) {
    super(context, attrs, defStyleAttr, defStyleRes);
    mAutofillManager = context.getSystemService(AutofillManager.class);
}
 

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.multiple_partitions_activity);
    mCustomVirtualView = findViewById(R.id.custom_view);
    mCredentialsPartition =
            mCustomVirtualView.addPartition(getString(R.string.partition_credentials));
    mCredentialsPartition.addLine("username", View.AUTOFILL_TYPE_TEXT,
            getString(R.string.username_label),
            "         ", false, View.AUTOFILL_HINT_USERNAME);
    mCredentialsPartition.addLine("password", View.AUTOFILL_TYPE_TEXT,
            getString(R.string.password_label),
            "         ", true, View.AUTOFILL_HINT_PASSWORD);
    int ccExpirationType = View.AUTOFILL_TYPE_DATE;
    // TODO: add a checkbox to switch between text / date instead
    Intent intent = getIntent();
    if (intent != null) {
        int newType = intent.getIntExtra("dateType", -1);
        if (newType != -1) {
            ccExpirationType = newType;
            String typeMessage = getString(R.string.message_credit_card_expiration_type,
                    Util.getAutofillTypeAsString(ccExpirationType));
            // TODO: display type in a header or proper status widget
            Toast.makeText(getApplicationContext(), typeMessage, Toast.LENGTH_LONG).show();
        }
    }
    mCcPartition = mCustomVirtualView.addPartition(getString(R.string.partition_credit_card));
    mCcPartition.addLine("ccNumber", View.AUTOFILL_TYPE_TEXT,
            getString(R.string.credit_card_number_label),
            "         ", true, View.AUTOFILL_HINT_CREDIT_CARD_NUMBER);
    mCcPartition.addLine("ccDay", View.AUTOFILL_TYPE_TEXT,
            getString(R.string.credit_card_expiration_day_label),
            "         ", true, View.AUTOFILL_HINT_CREDIT_CARD_EXPIRATION_DAY);
    mCcPartition.addLine("ccMonth", ccExpirationType,
            getString(R.string.credit_card_expiration_month_label),
            "         ", true, View.AUTOFILL_HINT_CREDIT_CARD_EXPIRATION_MONTH);
    mCcPartition.addLine("ccYear", View.AUTOFILL_TYPE_TEXT,
            getString(R.string.credit_card_expiration_year_label),
            "         ", true, View.AUTOFILL_HINT_CREDIT_CARD_EXPIRATION_YEAR);
    mCcPartition.addLine("ccDate", ccExpirationType,
            getString(R.string.credit_card_expiration_date_label),
            "         ", true, View.AUTOFILL_HINT_CREDIT_CARD_EXPIRATION_DATE);
    mCcPartition.addLine("ccSecurityCode", View.AUTOFILL_TYPE_TEXT,
            getString(R.string.credit_card_security_code_label),
            "         ", true, View.AUTOFILL_HINT_CREDIT_CARD_SECURITY_CODE);
    mAutofillManager = getSystemService(AutofillManager.class);
    findViewById(R.id.clear).setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            resetFields();
            mCustomVirtualView.resetPositions();
            mAutofillManager.cancel();
        }
    });
}
 

private static boolean isAutofillUIShowing(View servedView) {
    AutofillManager afm = servedView.getContext().getSystemService(AutofillManager.class);
    return afm != null && afm.isAutofillUiShowing();
}
 

/** @hide */
@Override
public AutofillManager.AutofillClient getAutofillClient() {
    final AutofillManager.AutofillClient client = super.getAutofillClient();
    if (client != null) {
        return client;
    }
    if (android.view.autofill.Helper.sVerbose) {
        Log.v(TAG, "getAutofillClient(): null on super, trying to find activity thread");
    }
    // Okay, ppl use the application context when they should not. This breaks
    // autofill among other things. We pick the focused activity since autofill
    // interacts only with the currently focused activity and we need the fill
    // client only if a call comes from the focused activity. Sigh...
    final ActivityThread activityThread = ActivityThread.currentActivityThread();
    if (activityThread == null) {
        return null;
    }
    final int activityCount = activityThread.mActivities.size();
    for (int i = 0; i < activityCount; i++) {
        final ActivityThread.ActivityClientRecord record =
                activityThread.mActivities.valueAt(i);
        if (record == null) {
            continue;
        }
        final Activity activity = record.activity;
        if (activity == null) {
            continue;
        }
        if (activity.getWindow().getDecorView().hasFocus()) {
            if (android.view.autofill.Helper.sVerbose) {
                Log.v(TAG, "getAutofillClient(): found activity for " + this + ": " + activity);
            }
            return activity;
        }
    }
    if (android.view.autofill.Helper.sVerbose) {
        Log.v(TAG, "getAutofillClient(): none of the " + activityCount + " activities on "
                + this + " have focus");
    }
    return null;
}
 

public DatePicker(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
    super(context, attrs, defStyleAttr, defStyleRes);

    // DatePicker is important by default, unless app developer overrode attribute.
    if (getImportantForAutofill() == IMPORTANT_FOR_AUTOFILL_AUTO) {
        setImportantForAutofill(IMPORTANT_FOR_AUTOFILL_YES);
    }

    final TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.DatePicker,
            defStyleAttr, defStyleRes);
    final boolean isDialogMode = a.getBoolean(R.styleable.DatePicker_dialogMode, false);
    final int requestedMode = a.getInt(R.styleable.DatePicker_datePickerMode, MODE_SPINNER);
    final int firstDayOfWeek = a.getInt(R.styleable.DatePicker_firstDayOfWeek, 0);
    a.recycle();

    if (requestedMode == MODE_CALENDAR && isDialogMode) {
        // You want MODE_CALENDAR? YOU CAN'T HANDLE MODE_CALENDAR! Well,
        // maybe you can depending on your screen size. Let's check...
        mMode = context.getResources().getInteger(R.integer.date_picker_mode);
    } else {
        mMode = requestedMode;
    }

    switch (mMode) {
        case MODE_CALENDAR:
            mDelegate = createCalendarUIDelegate(context, attrs, defStyleAttr, defStyleRes);
            break;
        case MODE_SPINNER:
        default:
            mDelegate = createSpinnerUIDelegate(context, attrs, defStyleAttr, defStyleRes);
            break;
    }

    if (firstDayOfWeek != 0) {
        setFirstDayOfWeek(firstDayOfWeek);
    }

    mDelegate.setAutoFillChangeListener((v, y, m, d) -> {
        final AutofillManager afm = context.getSystemService(AutofillManager.class);
        if (afm != null) {
            afm.notifyValueChanged(this);
        }
    });
}
 

public CustomVirtualView(Context context, AttributeSet attrs, int defStyleAttr,
        int defStyleRes) {
    super(context, attrs, defStyleAttr, defStyleRes);
    mAutofillManager = context.getSystemService(AutofillManager.class);
}
 

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.multiple_partitions_activity);
    mCustomVirtualView = findViewById(R.id.custom_view);
    mCredentialsPartition =
            mCustomVirtualView.addPartition(getString(R.string.partition_credentials));
    mCredentialsPartition.addLine("username", View.AUTOFILL_TYPE_TEXT,
            getString(R.string.username_label),
            "         ", false, View.AUTOFILL_HINT_USERNAME);
    mCredentialsPartition.addLine("password", View.AUTOFILL_TYPE_TEXT,
            getString(R.string.password_label),
            "         ", true, View.AUTOFILL_HINT_PASSWORD);
    int ccExpirationType = View.AUTOFILL_TYPE_DATE;
    // TODO: add a checkbox to switch between text / date instead
    Intent intent = getIntent();
    if (intent != null) {
        int newType = intent.getIntExtra("dateType", -1);
        if (newType != -1) {
            ccExpirationType = newType;
            String typeMessage = getString(R.string.message_credit_card_expiration_type,
                    Util.getAutofillTypeAsString(ccExpirationType));
            // TODO: display type in a header or proper status widget
            Toast.makeText(getApplicationContext(), typeMessage, Toast.LENGTH_LONG).show();
        }
    }
    mCcPartition = mCustomVirtualView.addPartition(getString(R.string.partition_credit_card));
    mCcPartition.addLine("ccNumber", View.AUTOFILL_TYPE_TEXT,
            getString(R.string.credit_card_number_label),
            "         ", true, View.AUTOFILL_HINT_CREDIT_CARD_NUMBER);
    mCcPartition.addLine("ccDay", View.AUTOFILL_TYPE_TEXT,
            getString(R.string.credit_card_expiration_day_label),
            "         ", true, View.AUTOFILL_HINT_CREDIT_CARD_EXPIRATION_DAY);
    mCcPartition.addLine("ccMonth", ccExpirationType,
            getString(R.string.credit_card_expiration_month_label),
            "         ", true, View.AUTOFILL_HINT_CREDIT_CARD_EXPIRATION_MONTH);
    mCcPartition.addLine("ccYear", View.AUTOFILL_TYPE_TEXT,
            getString(R.string.credit_card_expiration_year_label),
            "         ", true, View.AUTOFILL_HINT_CREDIT_CARD_EXPIRATION_YEAR);
    mCcPartition.addLine("ccDate", ccExpirationType,
            getString(R.string.credit_card_expiration_date_label),
            "         ", true, View.AUTOFILL_HINT_CREDIT_CARD_EXPIRATION_DATE);
    mCcPartition.addLine("ccSecurityCode", View.AUTOFILL_TYPE_TEXT,
            getString(R.string.credit_card_security_code_label),
            "         ", true, View.AUTOFILL_HINT_CREDIT_CARD_SECURITY_CODE);
    mAutofillManager = getSystemService(AutofillManager.class);
    findViewById(R.id.clear).setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            resetFields();
            mCustomVirtualView.resetPositions();
            mAutofillManager.cancel();
        }
    });
}
 

private void attrHandler(final Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
    // DatePicker is important by default, unless app developer overrode attribute.
    if (Build.VERSION.SDK_INT > Build.VERSION_CODES.O) {
        if (getImportantForAutofill() == IMPORTANT_FOR_AUTOFILL_AUTO) {
            setImportantForAutofill(IMPORTANT_FOR_AUTOFILL_YES);
        }
    }

    final TypedArray a = context.obtainStyledAttributes(
            attrs, R.styleable.TimePicker, defStyleAttr, defStyleRes);
    final boolean isDialogMode = a.getBoolean(R.styleable.TimePicker_dtp_dialogMode, false);
    final int requestedMode = a.getInt(R.styleable.TimePicker_timePickerMode, MODE_SPINNER);
    a.recycle();

    if (requestedMode == MODE_CLOCK && isDialogMode) {
        // You want MODE_CLOCK? YOU CAN'T HANDLE MODE_CLOCK! Well, maybe
        // you can depending on your screen size. Let's check...
        mMode = context.getResources().getInteger(R.integer.time_picker_mode);
    } else {
        mMode = requestedMode;
    }

    switch (mMode) {
        case MODE_CLOCK:
            mDelegate = new TimePickerClockDelegate(
                    this, context, attrs, defStyleAttr, defStyleRes);
            break;
        case MODE_SPINNER:
        default:
            mDelegate = new TimePickerSpinnerDelegate(
                    this, context, attrs, defStyleAttr, defStyleRes);
            break;
    }


    mDelegate.setAutoFillChangeListener(new OnTimeChangedListener() {
        @Override
        public void onTimeChanged(TimePicker v, int h, int m) {
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                final AutofillManager afm = context.getSystemService(AutofillManager.class);
                if (afm != null) {
                    afm.notifyValueChanged(TimePicker.this);
                }
            }
        }
    });
}
 

/**
 * Gets the events that happened after the last
 * {@link AutofillService#onFillRequest(FillRequest, android.os.CancellationSignal, FillCallback)}
 * call.
 *
 * <p>This method is typically used to keep track of previous user actions to optimize further
 * requests. For example, the service might return email addresses in alphabetical order by
 * default, but change that order based on the address the user picked on previous requests.
 *
 * <p>The history is not persisted over reboots, and it's cleared every time the service
 * replies to a {@link #onFillRequest(FillRequest, CancellationSignal, FillCallback)} by calling
 * {@link FillCallback#onSuccess(FillResponse)} or {@link FillCallback#onFailure(CharSequence)}
 * (if the service doesn't call any of these methods, the history will clear out after some
 * pre-defined time). Hence, the service should call {@link #getFillEventHistory()} before
 * finishing the {@link FillCallback}.
 *
 * @return The history or {@code null} if there are no events.
 */
@Nullable public final FillEventHistory getFillEventHistory() {
    final AutofillManager afm = getSystemService(AutofillManager.class);

    if (afm == null) {
        return null;
    } else {
        return afm.getFillEventHistory();
    }
}