How to count the no. of failed password attempts and start another activity if password fails?

Question

I have already given my app the administer privileges, now I want to monitor no. of failed password attempts using DeviceAdminReceiver or BoradcastReceiver. Can someone provide the code or some help? Also, where should I count the no. of failed attempts? In the class that is broadcasting or in the one which is receiving? Please explain in detail if you can. Thank you!

My code:

MainActivity.java

package com.bew.locksmith;

import android.app.Activity;
import android.app.admin.DevicePolicyManager;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener {


    int counter=0;
    public int attempts=0;

    private static final int ADMIN_INTENT = 15;

    private static final String description = "Sample Administrator description";
    public static final String ACTION_PASSWORD_FAILED= "android.app.action.ACTION_PASSWORD_FAILED";
    private DevicePolicyManager mDevicePolicyManager, mDevicePolicyManager2; 
    private ComponentName mComponentName,mComponentName2;  

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mDevicePolicyManager = (DevicePolicyManager)getSystemService(  
                Context.DEVICE_POLICY_SERVICE);  
        mComponentName = new ComponentName(this, MyAdminReceiver.class);  //MyadminReciever changed here 
        Button btnEnableAdmin = (Button) findViewById(R.id.btnEnable);
        Button btnDisableAdmin = (Button) findViewById(R.id.btnDisable);
        Button btnLock = (Button) findViewById(R.id.btnLock);
        btnEnableAdmin.setOnClickListener(this);
        btnDisableAdmin.setOnClickListener(this);
        btnLock.setOnClickListener(this);

    /*  mDevicePolicyManager2 = (DevicePolicyManager)getSystemService(  
                Context.);  */

    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
        case R.id.btnEnable:
            Intent intent = new Intent(DevicePolicyManager.ACTION_ADD_DEVICE_ADMIN);
            intent.putExtra(DevicePolicyManager.EXTRA_DEVICE_ADMIN, mComponentName);
            intent.putExtra(DevicePolicyManager.EXTRA_ADD_EXPLANATION,description);
            startActivityForResult(intent, ADMIN_INTENT);
            break;

        case R.id.btnDisable:
            mDevicePolicyManager.removeActiveAdmin(mComponentName);  
            Toast.makeText(getApplicationContext(), "Admin registration removed", Toast.LENGTH_SHORT).show();
            break;

        case R.id.btnLock:
            boolean isAdmin = mDevicePolicyManager.isAdminActive(mComponentName);  
            if (isAdmin) {  
                mDevicePolicyManager.lockNow();  
            }else{
                Toast.makeText(getApplicationContext(), "Not Registered as admin", Toast.LENGTH_SHORT).show();
            }
            break;
        }
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (requestCode == ADMIN_INTENT) {
            if (resultCode == RESULT_OK) {
                Toast.makeText(getApplicationContext(), "Registered As Admin", Toast.LENGTH_SHORT).show();

            }else{
                Toast.makeText(getApplicationContext(), "Failed to register as Admin", Toast.LENGTH_SHORT).show();
            }
        }
    }

}

MyAdminReceiver.java

 package com.bew.locksmith;



import android.app.admin.DeviceAdminReceiver;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.preference.PreferenceManager;
import android.widget.Toast;

public class MyAdminReceiver extends DeviceAdminReceiver{





          private static final String KEY_ATTEMPTS_NO = "attempts_no";
          private static final int LIMIT = 3;

          @Override
          public void onPasswordFailed(Context context, Intent intent) {
            SharedPreferences sharedPrefs = PreferenceManager.getDefaultSharedPreferences(context);
            int attempts = sharedPrefs.getInt(KEY_ATTEMPTS_NO, 0) + 1;

            if (attempts == LIMIT) {
              // Reset the counter
              sharedPrefs.edit().putInt(KEY_ATTEMPTS_NO, 0).apply();

              // Launch your activity
              context.startActivity(new Intent(context, test.class));
              Toast.makeText(context, "start activity", Toast.LENGTH_LONG).show();
            } else {
              // Save the new attempts number
              sharedPrefs.edit().putInt(KEY_ATTEMPTS_NO, attempts).apply();
            }
          }

          @Override
          public void onPasswordSucceeded(Context context, Intent intent) {
            // Reset number of attempts
            SharedPreferences sharedPrefs = PreferenceManager.getDefaultSharedPreferences(context);
            sharedPrefs.edit().putInt(KEY_ATTEMPTS_NO, 0).apply();
          }








    @Override
    public void onReceive(Context arg0, Intent arg1) {
        // TODO Auto-generated method stub

        // TODO Auto-generated method stub
        Toast.makeText(arg0, "here", Toast.LENGTH_LONG).show();

        /*Intent i = new Intent();
        i.setClassName("com.bew.locksmith","com.bew.locksmith.test");
        arg0.startActivity(i);*/

        //String action = arg1.getAction();


    }




}

test.java

    package com.bew.locksmith;

import android.app.Activity;
import android.app.admin.DeviceAdminReceiver;
import android.content.Context;
import android.content.Intent;
import android.hardware.Camera;
import android.os.Bundle;
import android.widget.Toast;

public class test extends Activity{

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.test);
    }
}

Manifest:

 <?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.bew.locksmith"
    android:versionCode="1"
    android:versionName="1.0">
    <uses-permission android:name="android.permission.CAMERA"/>

    <uses-sdk
        android:minSdkVersion="9"
        android:targetSdkVersion="17" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.bew.locksmith.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
         <receiver
            android:name="MyAdminReceiver"
            android:permission="android.permission.BIND_DEVICE_ADMIN">
            <meta-data
                android:name="android.app.device_admin"
                android:resource="@xml/admin"/>

            <intent-filter>
                <action android:name="android.app.action.DEVICE_ADMIN_ENABLED" />
            </intent-filter>
        </receiver>

         <activity
            android:name="com.bew.locksmith.test"
            android:label="@string/app_name" >
          <category android:name="android.intent.category.DEFAULT" />

        </activity>

    </application>

</manifest>

Update: Added my code, now remove that -1, whoever had done that!

For the record, if anyone cares I still haven't got any solution, so thank you stackoverflow, many thanks to the user @commonsware and two more whom I can't tag because S.O. isn't allowing me. — Aman B., Jan 15 '15 at 14:05

score 0 · Answer 1 · edited May 23 '17 at 12:03

0

See CommonsWare's answer:

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

What you need to do is change the DeviceAdminReceiver implementation to this:

public class AdminReceiver extends DeviceAdminReceiver {
    @Override
    public void onPasswordFailed(Context ctxt, Intent intent) {
        DevicePolicyManager mgr = (DevicePolicyManager) ctxt.getSystemService(Context.DEVICE_POLICY_SERVICE);
        int no = mgr.getCurrentFailedPasswordAttempts();

        if (no >= 3) {
            context.startActivity(new Intent(context, MyActivity.class));
        }
    }
}

edited May 23 '17 at 12:03

Community

1
1

answered Jan 10 '15 at 19:49

aluxian

986
10
27

Thanks, for answering but nothing happens if the password is entered incorrectly more than three times, I am trying to open a class having a layout with just a string in it, but nothing is happening it's just normal. – Aman B. Jan 10 '15 at 20:17
Okay, to be honest I'm not sure whether you can launch an activity like this. But let's test the logic, add `Toast.makeText(context, "start activity", Toast.LENGTH_LONG).show();` after `// Launch your activity` and tell me if it shows up. – aluxian Jan 10 '15 at 20:19
Also, in Logcat, the first error I see is Tag : "SurfaceFlinger" in Text " ro.sf.lcd_density must be defined as a build property" – Aman B. Jan 10 '15 at 20:20
Nothing changed with the previous code, I'll try the new one now. – Aman B. Jan 10 '15 at 20:31
Also check [this](http://stackoverflow.com/a/13975019/1133344) out. – aluxian Jan 10 '15 at 20:33
Not helping, the link you gave just says there is way to send data through sharedpreferences not sure how to use that and commonsware's code is confusing as well. :/ – Aman B. Jan 10 '15 at 20:41

How to count the no. of failed password attempts and start another activity if password fails?

1 Answers1