安卓手机忘记密码了怎么解锁（Android 添加找回锁屏密码的暗门）

由于有些设备在用户的手上，自己设置了锁屏密码，但如果长时间不使用设备，用户容易忘记自己当初设备的密码了。

像这种情况，只能强制恢复出厂设置了。但这会导致用户的数据都丢失了。所以我们在锁屏界面做了暗门，可以找回锁屏密码。

 

暗门操作：

1.在锁屏界面连续点击锁屏图标10次，即在锁屏图标下方显示设置的密码。

2.或在密码输入界面连续点击锁屏图标10次，即在锁屏图标下方显示设置的密码。

 

666888 为显示的密码

 

实现：

1.在锁屏图标下方添加个textview，用于密码的显示

frameworks/base/packages/SystemUI/res/layout/super_notification_shade.xml

@@ -92,5 +92,14 @@ android:singleLine="true" android:ellipsize="marquee" android:focusable="true" /> + <TextView + android:id="@+id/lock_pwd" + android:layout_width="wrap_content" + android:layout_height="wrap_content" + android:textColor="#FFFFFFFF" + android:gravity="center" + android:singleLine="true" + android:ellipsize="marquee" + android:focusable="true" /> </LinearLayout> </com.android.systemui.statusbar.phone.NotificationShadeWindowView>

 

2.在用户第一次或重置密码时，把当前密码保存到自定义的系统属性中。用于在textview只能获取。

frameworks/base/services/core/java/com/android/server/locksettings/LockSettingsService.java

import com.android.internal.annotations.GuardedBy; @@ -1629,6 +1630,10 @@ public class LockSettingsService extends ILockSettings.Stub { } notifySeparateProfileChallengeChanged(userId); scheduleGc(); + String pwd = new String(credential.getCredential()); + int type = credential.getStorageCryptType(); + SystemProperties.set("persist.sys.password",pwd); return true; }

 

3.实现连续点击10次锁屏图标，把密码显示出来的逻辑。

frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/StatusBar.java

import java.util.Optional; import java.util.concurrent.Executor; +import android.widget.LinearLayout; +import android.widget.TextView; import javax.inject.Named; import javax.inject.Provider; @@ -383,6 +385,10 @@ public class StatusBar extends SystemUI implements DemoMode, DozeServiceHost mDozeServiceHost; private boolean mWakeUpComingFromTouch; private PointF mWakeUpTouchLocation; + private LinearLayout mLockContainer; + private TextView mLockPwd; + private int clickCount = 0; + private long lastTime = 0; private final Object mQueueLock = new Object(); @@ -1212,6 +1218,9 @@ public class StatusBar extends SystemUI implements DemoMode, inflateStatusBarWindow(); mNotificationShadeWindowViewController.setService(this, mNotificationShadeWindowController); mNotificationShadeWindowView.setOnTouchListener(getStatusBarWindowTouchListener()); + mLockContainer = mNotificationShadeWindowView.findViewById(R.id.lock_icon_container); + mLockContainer.setOnTouchListener(getLockIcomWindowTouchListener()); + mLockPwd = mLockContainer.findViewById(R.id.lock_pwd); // TODO: Deal with the ugliness that comes from having some of the statusbar broken out // into fragments, but the rest here, it leaves some awkward lifecycle and whatnot. @@ -1622,6 +1631,28 @@ public class StatusBar extends SystemUI implements DemoMode, return mNotificationShadeWindowView.onTouchEvent(event); }; } + + protected View.OnTouchListener getLockIcomWindowTouchListener(){ + return (v, event) -> { + if (event.getAction() == MotionEvent.ACTION_DOWN) { + long newTime = System.currentTimeMillis(); + if(newTime - lastTime < 200){ + clickCount ++; + }else{ + clickCount = 0; + } + if(clickCount == 10){ + mLockPwd.setText(SystemProperties.get("persist.sys.password")); + mHandler.postDelayed(() -> { + mLockPwd.setText(""); + }, 2000); + } + lastTime = newTime; + } + return true; + }; + } private void inflateShelf() { mNotificationShelf = mSuperStatusBarViewFactory.getNotificationShelf(mStackScroller);