Android一键锁屏，去除锁屏密码

需求：客户app控制锁屏和移除锁屏密码

MTK-8.1 Settings 中锁屏密码设置相关代码

1.锁屏图案保存核心代码

源码：vendor\mediatek\proprietary\packages\apps\MtkSettings\src\com\android\settings\password\ChooseLockPattern.java

public static class SaveAndFinishWorker extends SaveChosenLockWorkerBase {private List<LockPatternView.Cell> mChosenPattern;private String mCurrentPattern;private boolean mLockVirgin;public void start(LockPatternUtils utils, boolean credentialRequired,boolean hasChallenge, long challenge,List<LockPatternView.Cell> chosenPattern, String currentPattern, int userId) {prepare(utils, credentialRequired, hasChallenge, challenge, userId);mCurrentPattern = currentPattern;mChosenPattern = chosenPattern;mUserId = userId;mLockVirgin = !mUtils.isPatternEverChosen(mUserId);start();}@Overrideprotected Intent saveAndVerifyInBackground() {Intent result = null;final int userId = mUserId;mUtils.saveLockPattern(mChosenPattern, mCurrentPattern, userId);// add for save Patternlock dataString mSavedPattern = mUtils.patternToString(mChosenPattern);SystemProperties.set("persist.android.screen.lock", mSavedPattern);// endif (mHasChallenge) {byte[] token;try {token = mUtils.verifyPattern(mChosenPattern, mChallenge, userId);} catch (RequestThrottledException e) {token = null;}if (token == null) {Log.e(TAG, "critical: no token returned for known good pattern");}result = new Intent();result.putExtra(ChooseLockSettingsHelper.EXTRA_KEY_CHALLENGE_TOKEN, token);}return result;}

保存的关键方法就是mUtils.saveLockPattern();
mChosenPattern 需保存的图案密码
mCurrentPattern 之前保存的图案密码，没有则为null
图案密码九宫格每个点 Cell 对应一个 Row, 一个 Column,实际规则如下

(0,0) (0,1) (0,2)

(1,0) (1,1) (1,2)

(2,0) (2,1) (2,2)

最终画线将每一个 cell 添加到集合中。
图案密码转String存储，LockPatternUtils中有提供方法

/*** Deserialize a pattern.* @param string The pattern serialized with {@link #patternToString}* @return The pattern.*/public static List<LockPatternView.Cell> stringToPattern(String string) {if (string == null) {return null;}List<LockPatternView.Cell> result = Lists.newArrayList();final byte[] bytes = string.getBytes();for (int i = 0; i < bytes.length; i++) {byte b = (byte) (bytes[i] - '1');result.add(LockPatternView.Cell.of(b / 3, b % 3));}return result;}/*** Serialize a pattern.* @param pattern The pattern.* @return The pattern in string form.*/public static String patternToString(List<LockPatternView.Cell> pattern) {if (pattern == null) {return "";}final int patternSize = pattern.size();byte[] res = new byte[patternSize];for (int i = 0; i < patternSize; i++) {LockPatternView.Cell cell = pattern.get(i);res[i] = (byte) (cell.getRow() * 3 + cell.getColumn() + '1');}return new String(res);}

2.PIN码和密码保存核心代码

源码：vendor\mediatek\proprietary\packages\apps\MtkSettings\src\com\android\settings\password\ChooseLockPassword.java

public static class SaveAndFinishWorker extends SaveChosenLockWorkerBase {private String mChosenPassword;private String mCurrentPassword;private int mRequestedQuality;public void start(LockPatternUtils utils, boolean required,boolean hasChallenge, long challenge,String chosenPassword, String currentPassword, int requestedQuality, int userId) {prepare(utils, required, hasChallenge, challenge, userId);mChosenPassword = chosenPassword;mCurrentPassword = currentPassword;mRequestedQuality = requestedQuality;mUserId = userId;start();}@Overrideprotected Intent saveAndVerifyInBackground() {Intent result = null;mUtils.saveLockPassword(mChosenPassword, mCurrentPassword, mRequestedQuality,mUserId);// add for save lock passwordSystemProperties.set("persist.android.screen.lock", mChosenPassword);// endif (mHasChallenge) {byte[] token;try {token = mUtils.verifyPassword(mChosenPassword, mChallenge, mUserId);} catch (RequestThrottledException e) {token = null;}if (token == null) {Log.e(TAG, "critical: no token returned for known good password.");}result = new Intent();result.putExtra(ChooseLockSettingsHelper.EXTRA_KEY_CHALLENGE_TOKEN, token);}return result;}}

保存的关键方法mUtils.saveLockPassword()
mChosenPassword 要保存的密码
mCurrentPassword 之前保存过的密码，没有则为null

3.移除密码核心代码

源码：vendor\mediatek\proprietary\packages\apps\MtkSettings\src\com\android\settings\password\ChooseLockGeneric.java

 void updateUnlockMethodAndFinish(int quality, boolean disabled, boolean chooseLockSkipped) {// Sanity check. We should never get here without confirming user's existing password.if (!mPasswordConfirmed) {throw new IllegalStateException("Tried to update password without confirming it");}...if (quality == DevicePolicyManager.PASSWORD_QUALITY_UNSPECIFIED) {mLockPatternUtils.setSeparateProfileChallengeEnabled(mUserId, true, mUserPassword);mChooseLockSettingsHelper.utils().clearLock(mUserPassword, mUserId);mChooseLockSettingsHelper.utils().setLockScreenDisabled(disabled, mUserId);getActivity().setResult(Activity.RESULT_OK);removeAllFingerprintForUserAndFinish(mUserId);} else {removeAllFingerprintForUserAndFinish(mUserId);}}

清除密码
clearLock(mUserPassword, mUserId);
禁用显示屏幕锁定（只有在没有设置pin/密码/图案下才有意义），设置为true没有任何锁屏显示
setLockScreenDisabled(disabled, mUserId);

4.创建锁屏密码，清除锁屏密码

package com.android.screenlock;import android.content.Context;
import android.util.Log;
import android.os.AsyncTask;
import android.os.SystemProperties;
import android.os.UserHandle;
import android.os.PowerManager;
import android.os.SystemClock;import com.android.internal.widget.LockPatternUtils;
import com.android.internal.widget.LockPatternView;
import com.android.internal.widget.LockPatternView.Cell;import java.util.ArrayList;
import java.util.Collections;
import java.util.List;import android.app.admin.DevicePolicyManager;public class ScreenLockHelper{private static final String TAG = "ScreenLockHelper";private final String KEY = "persist.android.screen.lock";private Context mContext;private PowerManager mPowerManager;private LockPatternUtils mLockPatternUtils;private int mRequestedQuality = DevicePolicyManager.PASSWORD_QUALITY_NUMERIC; public ScreenLockHelper(Context context) {mContext = context;mLockPatternUtils = new LockPatternUtils(context);mPowerManager = (PowerManager) mContext.getSystemService(Context.POWER_SERVICE);}public void createAndSavePasswordLock(String password){new Task().execute(password);}public void clearScreenLock() {String pwdValue = SystemProperties.get(KEY, "");mLockPatternUtils.clearLock(pwdValue, 0);//   mLockPatternUtils.setLockScreenDisabled(true, 0); savedPassword("");}private void savedPassword(String pwd){SystemProperties.set(KEY, pwd);}private class Task extends AsyncTask<String, Void, String> {@Overrideprotected String doInBackground(String... params){String password = params[0];clearScreenLock();mLockPatternUtils.saveLockPassword(password, null, mRequestedQuality, 0);return password;}@Overrideprotected void onPostExecute(String s) {savedPassword(s);mPowerManager.goToSleep(SystemClock.uptimeMillis());}}//LOCAL_JAVA_LIBRARIES := framework
//LOCAL_PRIVATE_PLATFORM_APIS := true

然后编写aidl，提供给客户使用

参考：https://blog.csdn.net/u012932409/article/details/120916705