packages_apps_Settings/src/com/android/settings/biometrics/BiometricEnrollBase.java

/*
 * Copyright (C) 2018 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 com.android.settings.biometrics;

import android.annotation.Nullable;
import android.content.Intent;
import android.content.res.Resources;
import android.graphics.Color;
import android.os.Bundle;
import android.os.UserHandle;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

import com.android.settings.R;
import com.android.settings.SetupWizardUtils;
import com.android.settings.biometrics.fingerprint.FingerprintEnrollEnrolling;
import com.android.settings.core.InstrumentedActivity;
import com.android.settings.password.ChooseLockSettingsHelper;

import com.google.android.setupdesign.GlifLayout;

/**
 * Base activity for all biometric enrollment steps.
 */
public abstract class BiometricEnrollBase extends InstrumentedActivity
        implements View.OnClickListener {
    public static final String EXTRA_KEY_LAUNCHED_CONFIRM = "launched_confirm_lock";


    /**
     * Used by the choose fingerprint wizard to indicate the wizard is
     * finished, and each activity in the wizard should finish.
     * <p>
     * Previously, each activity in the wizard would finish itself after
     * starting the next activity. However, this leads to broken 'Back'
     * behavior. So, now an activity does not finish itself until it gets this
     * result.
     */
    public static final int RESULT_FINISHED = RESULT_FIRST_USER;

    /**
     * Used by the enrolling screen during setup wizard to skip over setting up fingerprint, which
     * will be useful if the user accidentally entered this flow.
     */
    public static final int RESULT_SKIP = RESULT_FIRST_USER + 1;

    /**
     * Like {@link #RESULT_FINISHED} except this one indicates enrollment failed because the
     * device was left idle. This is used to clear the credential token to require the user to
     * re-enter their pin/pattern/password before continuing.
     */
    public static final int RESULT_TIMEOUT = RESULT_FIRST_USER + 2;

    public static final int CONFIRM_REQUEST = 1;
    public static final int ENROLLING = 2;

    protected boolean mLaunchedConfirmLock;
    protected byte[] mToken;
    protected int mUserId;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mToken = getIntent().getByteArrayExtra(ChooseLockSettingsHelper.EXTRA_KEY_CHALLENGE_TOKEN);
        if (savedInstanceState != null && mToken == null) {
            mLaunchedConfirmLock = savedInstanceState.getBoolean(EXTRA_KEY_LAUNCHED_CONFIRM);
            mToken = savedInstanceState.getByteArray(
                    ChooseLockSettingsHelper.EXTRA_KEY_CHALLENGE_TOKEN);
        }
        mUserId = getIntent().getIntExtra(Intent.EXTRA_USER_ID, UserHandle.myUserId());
    }

    @Override
    protected void onApplyThemeResource(Resources.Theme theme, int resid, boolean first) {
        resid = SetupWizardUtils.getTheme(getIntent());
        super.onApplyThemeResource(theme, resid, first);
    }

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        outState.putBoolean(EXTRA_KEY_LAUNCHED_CONFIRM, mLaunchedConfirmLock);
        outState.putByteArray(ChooseLockSettingsHelper.EXTRA_KEY_CHALLENGE_TOKEN, mToken);
    }

    @Override
    protected void onPostCreate(@Nullable Bundle savedInstanceState) {
        super.onPostCreate(savedInstanceState);
        initViews();
    }

    protected boolean shouldLaunchConfirmLock() {
        return mToken == null && !mLaunchedConfirmLock;
    }

    protected void initViews() {
        getWindow().setStatusBarColor(Color.TRANSPARENT);
        Button nextButton = getNextButton();
        if (nextButton != null) {
            nextButton.setOnClickListener(this);
        }
    }

    protected GlifLayout getLayout() {
        return (GlifLayout) findViewById(R.id.setup_wizard_layout);
    }

    protected void setHeaderText(int resId, boolean force) {
        TextView layoutTitle = getLayout().getHeaderTextView();
        CharSequence previousTitle = layoutTitle.getText();
        CharSequence title = getText(resId);
        if (previousTitle != title || force) {
            if (!TextUtils.isEmpty(previousTitle)) {
                layoutTitle.setAccessibilityLiveRegion(View.ACCESSIBILITY_LIVE_REGION_POLITE);
            }
            getLayout().setHeaderText(title);
            setTitle(title);
        }
    }

    protected void setHeaderText(int resId) {
        setHeaderText(resId, false /* force */);
    }

    protected Button getNextButton() {
        return (Button) findViewById(R.id.next_button);
    }

    @Override
    public void onClick(View v) {
        if (v == getNextButton()) {
            onNextButtonClick();
        }
    }

    protected void onNextButtonClick() {
    }

    protected Intent getFingerprintEnrollingIntent() {
        Intent intent = new Intent();
        intent.setClassName("com.android.settings", FingerprintEnrollEnrolling.class.getName());
        intent.putExtra(ChooseLockSettingsHelper.EXTRA_KEY_CHALLENGE_TOKEN, mToken);
        if (mUserId != UserHandle.USER_NULL) {
            intent.putExtra(Intent.EXTRA_USER_ID, mUserId);
        }
        return intent;
    }

    protected void launchConfirmLock(int titleResId, long challenge) {
        ChooseLockSettingsHelper helper = new ChooseLockSettingsHelper(this);
        boolean launchedConfirmationActivity;
        if (mUserId == UserHandle.USER_NULL) {
            launchedConfirmationActivity = helper.launchConfirmationActivity(CONFIRM_REQUEST,
                    getString(titleResId),
                    null, null, challenge);
        } else {
            launchedConfirmationActivity = helper.launchConfirmationActivity(CONFIRM_REQUEST,
                    getString(titleResId),
                    null, null, challenge, mUserId);
        }
        if (!launchedConfirmationActivity) {
            // This shouldn't happen, as we should only end up at this step if a lock thingy is
            // already set.
            finish();
        } else {
            mLaunchedConfirmLock = true;
        }
    }
}