Detect Lock Screen Incorrect Password by user in Android

问题

I am building a security app and I need to know if the user is giving incorrect password . Suppose user phone is locked by pattern lock system , and unfortunately user has forgotten the pattern password.When user give wrong pattern 5 time, there will be a penalty for 30 sec . I need to catch that penalty event . In my app, i have to do some task (for the safety of user) when this even come . Please help me,

回答1:

You can set up a DeviceAdminReceiver that will be notified about failed password attempts, as well as a successful password attempt that occurred after a failed attempt. This is covered in the documentation of Android's device administration APIs.

Note that the user will have to agree to allow your app to serve as a device administrator, via the Settings app, before you will get these events.

This sample project demonstrates listening for those events, plus setting up a password quality policy. The key pieces are:

• the DeviceAdminReceiver implementation
• the device admin metadata, stating what administrative capabilities your app wants
• the receiver's entry in the manifest
• code in the activity to detect if your app is approved to serve as a device administrator and, if not, lead the user to the spot in Settings to make that change

回答2:

I am doing the same thing on android studio with API level-22. but nothing is happening . Its showing an error- "Installing com.example.sourav.myfirstapp DEVICE SHELL COMMAND: pm install -r "/data/local/tmp/com.example.sourav.myfirstapp" pkg: /data/local/tmp/com.example.sourav.myfirstapp Failure [INSTALL_PARSE_FAILED_MANIFEST_MALFORMED]"

here is my detail of my project - Admin receiver main activity-

public class AdminReceiver extends DeviceAdminReceiver {

@Override
public void onPasswordChanged(Context ctxt, Intent intent) {
    DevicePolicyManager mgr=
            (DevicePolicyManager)ctxt.getSystemService(Context.DEVICE_POLICY_SERVICE);
    int msgId;

    if (mgr.isActivePasswordSufficient()) {
        msgId=R.string.compliant;
    }
    else msgId = R.string.not_compliant;

    Toast.makeText(ctxt, msgId, Toast.LENGTH_LONG).show();
}

@Override
public void onPasswordFailed(Context ctxt, Intent intent) {
    Toast.makeText(ctxt, "u will never break!", Toast.LENGTH_LONG)
            .show();
    String tag="tag";
    Log.v(tag,"this massage from error" );
}

@Override
public void onPasswordSucceeded(Context ctxt, Intent intent) {
    Toast.makeText(ctxt, "good u enterd", Toast.LENGTH_LONG)
            .show();
    String tag="tag";
    Log.v(tag, "this massage from success");
}
}

manifest-

 <?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
 package="com.example.sourav.myfirstapp" >



 <application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:supportsRtl="true"
    android:theme="@style/AppTheme" >

    <receiver
        android:name="AdminReceiver"
        android:permission="android.permission.BIND_DEVICE_ADMIN">
        <meta-data
            android:name="android.app.device_admin"
            />

        <intent-filter>

            <action    android:name="android.app.action.ACTION_PASSWORD_FAILED"/>
            <action     android:name="android.app.action.ACTION_PASSWORD_SUCCEEDED"/>
        </intent-filter>
    </receiver>
</application>

 </manifest>




Metadata-

 <device-admin xmlns:android="http://schemas.android.com/apk/res/android">

   <uses-policies>
    <limit-password/>

    <watch-login/>
</uses-policies>

回答3:

1. First step is to get your app the DEVICE_ADMIN privilege by the user.

2. Write your own class which extends DeviceAdminReceiver. For this you need to import import android.app.admin.DeviceAdminReceiver;

3. Override the methods in your case something like:

   @Override
   public void onPasswordFailed(Context context, Intent intent) {
       Log.d("Hello", "onPasswordFailed");
   }
   @Override
   public void onPasswordSucceeded(Context context, Intent intent) {
       Log.d("Hello", "onPasswordSucceeded");
   }
   

来源：https://stackoverflow.com/questions/22880395/detect-lock-screen-incorrect-password-by-user-in-android