理解IActivityController
一 IActivityController.aidl简介
IActivityController.aidl是系统自带的aidl,在Am的内部类MyActivityController有实现这个aidl接口，主要用于app状态监听控制。对于应用开发者来说，此接口为给我们提供了各种可能性，比如统计每个app启动次数，crash次数等。这里我们先看下他的方法：
- activityStarting：当系统正在启动一个activity时会触发，当返回true，表示允许启动。当返回状态noraml/false分别表示停止/拒绝启动activity
- activityResuming：当系统正在返回一个activity时会触发，当返回true，表示允许返回。当返回状态noraml/false分别表示停止/拒绝返回activity
- appCrashed：当一个应用进程已经崩溃会触发，当返回true时，表示可以重启，当返回false时，表示立即杀死它（进程）。
- appEarlyNotResponding:检测到 ANR 时立即进行早期呼叫。
- appNotResponding：当一个应用进程出现ANR时就会触发，当返回0时，表示会弹出应用无响应的dialog，如果返回1时，表示继续等待，如果返回-1时，表示立即杀死进程。
- systemNotResponding：当系统看门狗已经监测到系统似乎挂起就会触发，如果放回1时，表示继续等待，如果返回-1时，就让系统进行正常的自杀（这里的正常自杀，我的理解是系统自己主动自杀，该保存的数据先保存等然后就自杀，并不是因为其他原因导致的自杀）
二代码实现
在项目java文件下创建一个包名为android.app，然后把一下文件粘贴进去
image.png
/*
* This file is auto-generated. DO NOT MODIFY.
*/
package android.app;
/**
* Testing interface to monitor what is happening in the activity manager
* while tests are running. Not for normal application development.
* {@hide}
*/
public interface IActivityController extends android.os.IInterface {
/**
* Default implementation for IActivityController.
*/
public static class Default implements IActivityController {
/**
* The system is trying to start an activity. Return true to allow
* it to be started as normal, or false to cancel/reject this activity.
*/
@Override
public boolean activityStarting(android.content.Intent intent, String pkg) throws android.os.RemoteException {
return false;
}
/**
* The system is trying to return to an activity. Return true to allow
* it to be resumed as normal, or false to cancel/reject this activity.
*/
@Override
public boolean activityResuming(String pkg) throws android.os.RemoteException {
return false;
}
/**
* An application process has crashed (in Java). Return true for the
* normal error recovery (app crash dialog) to occur, false to kill
* it immediately.
*/
@Override
public boolean appCrashed(String processName, int pid, String shortMsg, String longMsg, long timeMillis, String stackTrace) throws android.os.RemoteException {
return false;
}
/**
* Early call as soon as an ANR is detected.
*/
@Override
public int appEarlyNotResponding(String processName, int pid, String annotation) throws android.os.RemoteException {
return 0;
}
/**
* An application process is not responding. Return 0 to show the "app
* not responding" dialog, 1 to continue waiting, or -1 to kill it
* immediately.
*/
@Override
public int appNotResponding(String processName, int pid, String processStats) throws android.os.RemoteException {
return 0;
}
/**
* The system process watchdog has detected that the system seems to be
* hung. Return 1 to continue waiting, or -1 to let it continue with its
* normal kill.
*/
@Override
public int systemNotResponding(String msg) throws android.os.RemoteException {
return 0;
}
@Override
public android.os.IBinder asBinder() {
return null;
}
}
/**
* Local-side IPC implementation stub class.
*/
public static abstract class Stub extends android.os.Binder implements IActivityController {
private static final String DESCRIPTOR = "android.app.IActivityController";
/**
* Construct the stub at attach it to the interface.
*/
public Stub() {
this.attachInterface(this, DESCRIPTOR);
}
/**
* Cast an IBinder object into an android.app.IActivityController interface,
* generating a proxy if needed.
*/
public static IActivityController asInterface(android.os.IBinder obj) {
if ((obj == null)) {
return null;
}
android.os.IInterface iin = obj.queryLocalInterface(DESCRIPTOR);
if (((iin != null) && (iin instanceof IActivityController))) {
return ((IActivityController) iin);
}
return new Proxy(obj);
}
@Override
public android.os.IBinder asBinder() {
return this;
}
@Override
public boolean onTransact(int code, android.os.Parcel data, android.os.Parcel reply, int flags) throws android.os.RemoteException {
String descriptor = DESCRIPTOR;
switch (code) {
case INTERFACE_TRANSACTION: {
reply.writeString(descriptor);
return true;
}
case TRANSACTION_activityStarting: {
data.enforceInterface(descriptor);
android.content.Intent _arg0;
if ((0 != data.readInt())) {
_arg0 = android.content.Intent.CREATOR.createFromParcel(data);
} else {
_arg0 = null;
}
String _arg1;
_arg1 = data.readString();
boolean _result = this.activityStarting(_arg0, _arg1);
reply.writeNoException();
reply.writeInt(((_result) ? (1) : (0)));
return true;
}
case TRANSACTION_activityResuming: {
data.enforceInterface(descriptor);
String _arg0;
_arg0 = data.readString();
boolean _result = this.activityResuming(_arg0);
reply.writeNoException();
reply.writeInt(((_result) ? (1) : (0)));
return true;
}
case TRANSACTION_appCrashed: {
data.enforceInterface(descriptor);
String _arg0;
_arg0 = data.readString();
int _arg1;
_arg1 = data.readInt();
String _arg2;
_arg2 = data.readString();
String _arg3;
_arg3 = data.readString();
long _arg4;
_arg4 = data.readLong();
String _arg5;
_arg5 = data.readString();
boolean _result = this.appCrashed(_arg0, _arg1, _arg2, _arg3, _arg4, _arg5);
reply.writeNoException();
reply.writeInt(((_result) ? (1) : (0)));
return true;
}
case TRANSACTION_appEarlyNotResponding: {
data.enforceInterface(descriptor);
String _arg0;
_arg0 = data.readString();
int _arg1;
_arg1 = data.readInt();
String _arg2;
_arg2 = data.readString();
int _result = this.appEarlyNotResponding(_arg0, _arg1, _arg2);
reply.writeNoException();
reply.writeInt(_result);
return true;
}
case TRANSACTION_appNotResponding: {
data.enforceInterface(descriptor);
String _arg0;
_arg0 = data.readString();
int _arg1;
_arg1 = data.readInt();
String _arg2;
_arg2 = data.readString();
int _result = this.appNotResponding(_arg0, _arg1, _arg2);
reply.writeNoException();
reply.writeInt(_result);
return true;
}
case TRANSACTION_systemNotResponding: {
data.enforceInterface(descriptor);
String _arg0;
_arg0 = data.readString();
int _result = this.systemNotResponding(_arg0);
reply.writeNoException();
reply.writeInt(_result);
return true;
}
default: {
return super.onTransact(code, data, reply, flags);
}
}
}
private static class Proxy implements IActivityController {
private android.os.IBinder mRemote;
Proxy(android.os.IBinder remote) {
mRemote = remote;
}
@Override
public android.os.IBinder asBinder() {
return mRemote;
}
public String getInterfaceDescriptor() {
return DESCRIPTOR;
}
/**
* The system is trying to start an activity. Return true to allow
* it to be started as normal, or false to cancel/reject this activity.
*/
@Override
public boolean activityStarting(android.content.Intent intent, String pkg) throws android.os.RemoteException {
android.os.Parcel _data = android.os.Parcel.obtain();
android.os.Parcel _reply = android.os.Parcel.obtain();
boolean _result;
try {
_data.writeInterfaceToken(DESCRIPTOR);
if ((intent != null)) {
_data.writeInt(1);
intent.writeToParcel(_data, 0);
} else {
_data.writeInt(0);
}
_data.writeString(pkg);
boolean _status = mRemote.transact(Stub.TRANSACTION_activityStarting, _data, _reply, 0);
if (!_status && getDefaultImpl() != null) {
return getDefaultImpl().activityStarting(intent, pkg);
}
_reply.readException();
_result = (0 != _reply.readInt());
} finally {
_reply.recycle();
_data.recycle();
}
return _result;
}
/**
* The system is trying to return to an activity. Return true to allow
* it to be resumed as normal, or false to cancel/reject this activity.
*/
@Override
public boolean activityResuming(String pkg) throws android.os.RemoteException {
android.os.Parcel _data = android.os.Parcel.obtain();
android.os.Parcel _reply = android.os.Parcel.obtain();
boolean _result;
try {
_data.writeInterfaceToken(DESCRIPTOR);
_data.writeString(pkg);
boolean _status = mRemote.transact(Stub.TRANSACTION_activityResuming, _data, _reply, 0);
if (!_status && getDefaultImpl() != null) {
return getDefaultImpl().activityResuming(pkg);
}
_reply.readException();
_result = (0 != _reply.readInt());
} finally {
_reply.recycle();
_data.recycle();
}
return _result;
}
/**
* An application process has crashed (in Java). Return true for the
* normal error recovery (app crash dialog) to occur, false to kill
* it immediately.
*/
@Override
public boolean appCrashed(String processName, int pid, String shortMsg, String longMsg, long timeMillis, String stackTrace) throws android.os.RemoteException {
android.os.Parcel _data = android.os.Parcel.obtain();
android.os.Parcel _reply = android.os.Parcel.obtain();
boolean _result;
try {
_data.writeInterfaceToken(DESCRIPTOR);
_data.writeString(processName);
_data.writeInt(pid);
_data.writeString(shortMsg);
_data.writeString(longMsg);
_data.writeLong(timeMillis);
_data.writeString(stackTrace);
boolean _status = mRemote.transact(Stub.TRANSACTION_appCrashed, _data, _reply, 0);
if (!_status && getDefaultImpl() != null) {
return getDefaultImpl().appCrashed(processName, pid, shortMsg, longMsg, timeMillis, stackTrace);
}
_reply.readException();
_result = (0 != _reply.readInt());
} finally {
_reply.recycle();
_data.recycle();
}
return _result;
}
/**
* Early call as soon as an ANR is detected.
*/
@Override
public int appEarlyNotResponding(String processName, int pid, String annotation) throws android.os.RemoteException {
android.os.Parcel _data = android.os.Parcel.obtain();
android.os.Parcel _reply = android.os.Parcel.obtain();
int _result;
try {
_data.writeInterfaceToken(DESCRIPTOR);
_data.writeString(processName);
_data.writeInt(pid);
_data.writeString(annotation);
boolean _status = mRemote.transact(Stub.TRANSACTION_appEarlyNotResponding, _data, _reply, 0);
if (!_status && getDefaultImpl() != null) {
return getDefaultImpl().appEarlyNotResponding(processName, pid, annotation);
}
_reply.readException();
_result = _reply.readInt();
} finally {
_reply.recycle();
_data.recycle();
}
return _result;
}
/**
* An application process is not responding. Return 0 to show the "app
* not responding" dialog, 1 to continue waiting, or -1 to kill it
* immediately.
*/
@Override
public int appNotResponding(String processName, int pid, String processStats) throws android.os.RemoteException {
android.os.Parcel _data = android.os.Parcel.obtain();
android.os.Parcel _reply = android.os.Parcel.obtain();
int _result;
try {
_data.writeInterfaceToken(DESCRIPTOR);
_data.writeString(processName);
_data.writeInt(pid);
_data.writeString(processStats);
boolean _status = mRemote.transact(Stub.TRANSACTION_appNotResponding, _data, _reply, 0);
if (!_status && getDefaultImpl() != null) {
return getDefaultImpl().appNotResponding(processName, pid, processStats);
}
_reply.readException();
_result = _reply.readInt();
} finally {
_reply.recycle();
_data.recycle();
}
return _result;
}
/**
* The system process watchdog has detected that the system seems to be
* hung. Return 1 to continue waiting, or -1 to let it continue with its
* normal kill.
*/
@Override
public int systemNotResponding(String msg) throws android.os.RemoteException {
android.os.Parcel _data = android.os.Parcel.obtain();
android.os.Parcel _reply = android.os.Parcel.obtain();
int _result;
try {
_data.writeInterfaceToken(DESCRIPTOR);
_data.writeString(msg);
boolean _status = mRemote.transact(Stub.TRANSACTION_systemNotResponding, _data, _reply, 0);
if (!_status && getDefaultImpl() != null) {
return getDefaultImpl().systemNotResponding(msg);
}
_reply.readException();
_result = _reply.readInt();
} finally {
_reply.recycle();
_data.recycle();
}
return _result;
}
public static IActivityController sDefaultImpl;
}
static final int TRANSACTION_activityStarting = (android.os.IBinder.FIRST_CALL_TRANSACTION + 0);
static final int TRANSACTION_activityResuming = (android.os.IBinder.FIRST_CALL_TRANSACTION + 1);
static final int TRANSACTION_appCrashed = (android.os.IBinder.FIRST_CALL_TRANSACTION + 2);
static final int TRANSACTION_appEarlyNotResponding = (android.os.IBinder.FIRST_CALL_TRANSACTION + 3);
static final int TRANSACTION_appNotResponding = (android.os.IBinder.FIRST_CALL_TRANSACTION + 4);
static final int TRANSACTION_systemNotResponding = (android.os.IBinder.FIRST_CALL_TRANSACTION + 5);
public static boolean setDefaultImpl(IActivityController impl) {
if (Proxy.sDefaultImpl == null && impl != null) {
Proxy.sDefaultImpl = impl;
return true;
}
return false;
}
public static IActivityController getDefaultImpl() {
return Proxy.sDefaultImpl;
}
}
/**
* The system is trying to start an activity. Return true to allow
* it to be started as normal, or false to cancel/reject this activity.
*/
public boolean activityStarting(android.content.Intent intent, String pkg) throws android.os.RemoteException;
/**
* The system is trying to return to an activity. Return true to allow
* it to be resumed as normal, or false to cancel/reject this activity.
*/
public boolean activityResuming(String pkg) throws android.os.RemoteException;
/**
* An application process has crashed (in Java). Return true for the
* normal error recovery (app crash dialog) to occur, false to kill
* it immediately.
*/
public boolean appCrashed(String processName, int pid, String shortMsg, String longMsg, long timeMillis, String stackTrace) throws android.os.RemoteException;
/**
* Early call as soon as an ANR is detected.
*/
public int appEarlyNotResponding(String processName, int pid, String annotation) throws android.os.RemoteException;
/**
* An application process is not responding. Return 0 to show the "app
* not responding" dialog, 1 to continue waiting, or -1 to kill it
* immediately.
*/
public int appNotResponding(String processName, int pid, String processStats) throws android.os.RemoteException;
/**
* The system process watchdog has detected that the system seems to be
* hung. Return 1 to continue waiting, or -1 to let it continue with its
* normal kill.
*/
public int systemNotResponding(String msg) throws android.os.RemoteException;
}
接下来需要新建一个代理类 继承IActivityController.Stub
package android.app;
import android.content.Intent;
import android.os.RemoteException;
import android.util.Log;
public class ActivityController extends IActivityController.Stub {
private static final String TAG = ActivityController.class.getSimpleName() + "======";
public boolean activityStarting(Intent intent, String pkg) throws RemoteException {
//拦截动作
Log.d(TAG, " >>>>>>start, pkg =" + pkg);
return true;
}
public boolean activityResuming(String pkg) throws RemoteException {
Log.d(TAG, ">>>>>>resuming, pkg =" + pkg);
return false;
}
public boolean appCrashed(String processName, int pid, String shortMsg, String longMsg, long timeMillis, String stackTrace) throws RemoteException {
return false;
}
public int appEarlyNotResponding(String processName, int pid, String annotation) throws RemoteException {
return 0;
}
public int appNotResponding(String processName, int pid, String processStats) throws RemoteException {
return 0;
}
public int systemNotResponding(String msg) throws RemoteException {
return 0;
}
}
通过反射设置代理类
package com.app.launcher.ui;
import android.app.ActivityController;
import android.os.Bundle;
import android.os.IBinder;
import android.util.Log;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
public class TestJavaActivity extends AppCompatActivity {
private static final String TAG = TestJavaActivity.class.getName();
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setActivityController();
}
//在进入页面时调用setActivityController()方法,注册aidl回调,当界面有变化时会触发activityStarting(),activityResuming()事件
public void setActivityController() {
Log.d(TAG, ">>>>>>0519,");
try {
Class cActivityManagerNative = Class.forName("android.app.ActivityManagerNative");
//加载得到ServiceManager类，然后得到方法getService。
Method getServiceMethod = Class.forName("android.os.ServiceManager").getDeclaredMethod("getService", new Class[]{String.class});
//通过getServiceMethod得到ServiceManager的实例（隐藏类，所以使用Object）
Object ServiceManager = getServiceMethod.invoke(null, new Object[]{"activity"});
Method iBinder = cActivityManagerNative.getMethod("asInterface", IBinder.class);
//获取到ActivityManagerService执行类
Object iAMS = iBinder.invoke(null, ServiceManager);
Method setMethod = iAMS.getClass().getMethod("setActivityController", Class.forName("android.app.IActivityController"), boolean.class);
//用我们的代理类替换系统的代理
setMethod.invoke(iAMS, new ActivityController(),true);
} catch (ClassNotFoundException | NoSuchMethodException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
}
}
}
借鉴文章