1 /* 2 * Copyright (C) 2021 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 android.jdwptunnel.sampleapp.ddms; 18 19 import android.app.Activity; 20 import android.os.Bundle; 21 import android.os.Debug; 22 import java.lang.reflect.Constructor; 23 import java.lang.reflect.Method; 24 25 /** 26 * A simple activity which starts a thread that continuously spams DDMS messages. 27 * 28 * <p>This serves as a simple target application/activity get a ddms connection to. 29 */ 30 public final class DdmsSampleDeviceActivity extends Activity { 31 @Override onCreate(Bundle icicle)32 public void onCreate(Bundle icicle) { 33 try { 34 super.onCreate(icicle); 35 setContentView(R.layout.sample_layout); 36 Debug.attachJvmtiAgent( 37 "libDdmsTestAgent.so", null, DdmsSampleDeviceActivity.class.getClassLoader()); 38 if (ForceNoHiddenapi() != 0) { 39 throw new Error("Failed to disable hiddenapi!"); 40 } 41 Class<?> chunk_klass = Class.forName("org.apache.harmony.dalvik.ddmc.Chunk"); 42 Constructor<?> chunk_cons = 43 chunk_klass.getConstructor( 44 Integer.TYPE, new byte[] {}.getClass(), Integer.TYPE, Integer.TYPE); 45 Class<?> server_klass = Class.forName("org.apache.harmony.dalvik.ddmc.DdmServer"); 46 Method send_meth = server_klass.getDeclaredMethod("sendChunk", chunk_klass); 47 // Spin spamming DDMS packets so we can try to lose the race. 48 Thread t = 49 new Thread( 50 () -> { 51 try { 52 while (true) { 53 send_meth.invoke( 54 null, 55 chunk_cons.newInstance(0xDEADBEEF, new byte[] {0x1, 0x3, 0x3, 0x7}, 0, 4)); 56 } 57 } catch (Exception e) { 58 throw new Error("Could not send data!", e); 59 } 60 }); 61 t.setDaemon(true); 62 t.start(); 63 } catch (Exception e) { 64 throw new Error("Failed to send ddm notes!", e); 65 } 66 } 67 68 // Linked by the agent ForceNoHiddenapi()69 public static native int ForceNoHiddenapi(); 70 } 71