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 import com.example.android.apis.graphics.CubeRenderer; 21 22 import android.app.Activity; 23 import android.opengl.GLSurfaceView; 24 import android.os.Bundle; 25 import android.view.SurfaceView; 26 import android.view.WindowManager; 27 28 /** 29 * <h3>Secure Window Activity</h3> 30 * 31 * <p> 32 * This activity demonstrates how to create a {@link SurfaceView} backed by 33 * a secure surface using {@link SurfaceView#setSecure}. 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 SecureSurfaceViewActivity extends Activity { 54 private GLSurfaceView mSurfaceView; 55 56 /** 57 * Initialization of the Activity after it is first created. Must at least 58 * call {@link android.app.Activity#setContentView setContentView()} to 59 * describe what is to be displayed in the screen. 60 */ 61 @Override onCreate(Bundle savedInstanceState)62 protected void onCreate(Bundle savedInstanceState) { 63 // Be sure to call the super class. 64 super.onCreate(savedInstanceState); 65 66 // See assets/res/any/layout/secure_surface_view_activity.xml for this 67 // view layout definition, which is being set here as 68 // the content of our screen. 69 setContentView(R.layout.secure_surface_view_activity); 70 71 // Set up the surface view. 72 // We use a GLSurfaceView in this demonstration but ordinary 73 // SurfaceViews also support the same secure surface functionality. 74 mSurfaceView = (GLSurfaceView)findViewById(R.id.surface_view); 75 mSurfaceView.setRenderer(new CubeRenderer(false)); 76 77 // Make the surface view secure. This must be done at the time the surface view 78 // is created before the surface view's containing window is attached to 79 // the window manager which happens after onCreate returns. 80 // It cannot be changed later. 81 mSurfaceView.setSecure(true); 82 } 83 84 @Override onResume()85 protected void onResume() { 86 // Be sure to call the super class. 87 super.onResume(); 88 89 // Resume rendering. 90 mSurfaceView.onResume(); 91 } 92 93 @Override onPause()94 protected void onPause() { 95 // Be sure to call the super class. 96 super.onPause(); 97 98 // Pause rendering. 99 mSurfaceView.onPause(); 100 } 101 } 102