1 /* 2 * Copyright (C) 2012 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 17 package com.example.android.apis.app; 18 19 import com.example.android.apis.R; 20 21 import android.app.Activity; 22 import android.app.AlertDialog; 23 import android.os.Bundle; 24 import android.view.View; 25 import android.view.WindowManager; 26 import android.widget.Button; 27 28 /** 29 * <h3>Secure Dialog Activity</h3> 30 * 31 * <p> 32 * This activity demonstrates how to create a dialog whose window is backed by 33 * a secure surface using {@link WindowManager.LayoutParams#FLAG_SECURE}. 34 * Because the surface is secure, its contents cannot be captured in screenshots 35 * and will not be visible on non-secure displays even when mirrored. 36 * </p><p> 37 * Here are a few things you can do to experiment with secure surfaces and 38 * observe their behavior. 39 * <ul> 40 * <li>Try taking a screenshot. Either the system will prevent you from taking 41 * a screenshot altogether or the screenshot should not contain the contents 42 * of the secure surface. 43 * <li>Try mirroring the secure surface onto a non-secure display such as an 44 * "Overlay Display" created using the "Simulate secondary displays" option in 45 * the "Developer options" section of the Settings application. The non-secure 46 * secondary display should not show the contents of the secure surface. 47 * <li>Try mirroring the secure surface onto a secure display such as an 48 * HDMI display with HDCP enabled. The contents of the secure surface should appear 49 * on the display. 50 * </ul> 51 * </p> 52 */ 53 public class SecureDialogActivity extends Activity 54 implements View.OnClickListener { 55 /** 56 * Initialization of the Activity after it is first created. Must at least 57 * call {@link android.app.Activity#setContentView setContentView()} to 58 * describe what is to be displayed in the screen. 59 */ 60 @Override 61 protected void onCreate(Bundle savedInstanceState) { 62 // Be sure to call the super class. 63 super.onCreate(savedInstanceState); 64 65 // See assets/res/any/layout/secure_dialog_activity.xml for this 66 // view layout definition, which is being set here as 67 // the content of our screen. 68 setContentView(R.layout.secure_dialog_activity); 69 70 // Handle click events on the button to show the dialog. 71 Button button = (Button)findViewById(R.id.show); 72 button.setOnClickListener(this); 73 } 74 75 /** 76 * Called when the button to show the dialog is clicked. 77 */ 78 @Override 79 public void onClick(View v) { 80 // Create a dialog. 81 AlertDialog dialog = new AlertDialog.Builder(this) 82 .setPositiveButton(android.R.string.ok, null) 83 .setMessage(R.string.secure_dialog_dialog_text) 84 .create(); 85 86 // Make the dialog secure. This must be done at the time the dialog is 87 // created. It cannot be changed after the dialog has been shown. 88 dialog.getWindow().setFlags(WindowManager.LayoutParams.FLAG_SECURE, 89 WindowManager.LayoutParams.FLAG_SECURE); 90 91 // Show the dialog. 92 dialog.show(); 93 } 94 } 95
