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      1 /*
      2  * Copyright (C) 2017 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 package com.example.android.datawiper;
     17 
     18 import android.app.Activity;
     19 import android.app.AlertDialog;
     20 import android.app.admin.DevicePolicyManager;
     21 import android.content.ComponentName;
     22 import android.content.Context;
     23 import android.content.DialogInterface;
     24 import android.content.Intent;
     25 import android.os.Bundle;
     26 import android.util.Log;
     27 import android.view.View;
     28 import android.widget.TextView;
     29 
     30 public class MyMain extends Activity {
     31     private static final int REQUEST_CODE_ENABLE_ADMIN = 1;
     32 
     33     @Override
     34     protected void onCreate(Bundle savedInstanceState) {
     35         super.onCreate(savedInstanceState);
     36 
     37         setContentView(R.layout.main);
     38     }
     39 
     40     @Override
     41     protected void onResume() {
     42         super.onResume();
     43 
     44         refreshUi();
     45     }
     46 
     47     @Override
     48     protected void onActivityResult(int requestCode, int resultCode, Intent data) {
     49         super.onActivityResult(requestCode, resultCode, data);
     50 
     51         refreshUi();
     52     }
     53 
     54     private void refreshUi() {
     55         final boolean isEnabled = MyAdmin.isEnabled(this);
     56         ((TextView) findViewById(R.id.add_as_admin)).setText(
     57                 isEnabled ? "Disable Admin" : "Enable Admin");
     58         findViewById(R.id.wipe_data).setEnabled(isEnabled);
     59     }
     60 
     61     public void onAddAsAdmin(View v) {
     62         if (MyAdmin.isEnabled(this)) {
     63             MyAdmin.disable(this);
     64         } else {
     65             enableAdmin();
     66         }
     67         refreshUi();
     68     }
     69 
     70     private void enableAdmin() {
     71         Intent intent = new Intent(DevicePolicyManager.ACTION_ADD_DEVICE_ADMIN);
     72         intent.putExtra(DevicePolicyManager.EXTRA_DEVICE_ADMIN, MyAdmin.getComponent(this));
     73         startActivityForResult(intent, REQUEST_CODE_ENABLE_ADMIN);
     74     }
     75 
     76     public static void restart(Context context) {
     77         Intent intent = new Intent().setComponent(new ComponentName(context, MyMain.class))
     78                 .setFlags(Intent.FLAG_ACTIVITY_NEW_TASK
     79                  | Intent.FLAG_ACTIVITY_CLEAR_TASK);
     80         context.startActivity(intent);
     81     }
     82 
     83     public void onWipeData(View v) {
     84         new AlertDialog.Builder(this)
     85                 .setIcon(android.R.drawable.ic_dialog_alert)
     86                 .setTitle("WARNING")
     87                 .setMessage("This will wipe the device. Are you sure?  Do you want to proceed?"
     88                     + "THIS CANNOT BE UNDONE.")
     89                 .setCancelable(true)
     90                 .setPositiveButton("WIPE NOW", new DialogInterface.OnClickListener() {
     91                     @Override
     92                     public void onClick(DialogInterface dialog, int which) {
     93                         Log.w("DataWiper", "Wiping...");
     94                         wipe();
     95                     }
     96                 })
     97                 .show();
     98     }
     99 
    100     private void wipe() {
    101         ((DevicePolicyManager) (getSystemService(Context.DEVICE_POLICY_SERVICE)))
    102                 .wipeData(0);
    103     }
    104 }
    105