更多精彩请直接访问SkySeraph个人站点： www.skyseraph.com
一、基础知识
1.Android 进程优先级
1.1 进程优先级等级一般分法：
- Activte process
- Visible Process
- Service process
- Background process
- Empty process
1.2 进程优先级号
ProcessList.java
// Adjustment used in certain places where we don't know it yet.
// (Generally this is something that is going to be cached, but we
// don't know the exact value in the cached range to assign yet.)
static final int UNKNOWN_ADJ = 16;
// This is a process only hosting activities that are not visible,
// so it can be killed without any disruption.
static final int CACHED_APP_MAX_ADJ = 15;
static final int CACHED_APP_MIN_ADJ = 9;
// The B list of SERVICE_ADJ -- these are the old and decrepit
// services that aren't as shiny and interesting as the ones in the A list.
static final int SERVICE_B_ADJ = 8;
// This is the process of the previous application that the user was in.
// This process is kept above other things, because it is very common to
// switch back to the previous app. This is important both for recent
// task switch (toggling between the two top recent apps) as well as normal
// UI flow such as clicking on a URI in the e-mail app to view in the browser,
// and then pressing back to return to e-mail.
static final int PREVIOUS_APP_ADJ = 7;
// This is a process holding the home application -- we want to try
// avoiding killing it, even if it would normally be in the background,
// because the user interacts with it so much.
static final int HOME_APP_ADJ = 6;
// This is a process holding an application service -- killing it will not
// have much of an impact as far as the user is concerned.
static final int SERVICE_ADJ = 5;
// This is a process with a heavy-weight application. It is in the
// background, but we want to try to avoid killing it. Value set in
// system/rootdir/init.rc on startup.
static final int HEAVY_WEIGHT_APP_ADJ = 4;
// This is a process currently hosting a backup operation. Killing it
// is not entirely fatal but is generally a bad idea.
static final int BACKUP_APP_ADJ = 3;
// This is a process only hosting components that are perceptible to the
// user, and we really want to avoid killing them, but they are not
// immediately visible. An example is background music playback.
static final int PERCEPTIBLE_APP_ADJ = 2;
// This is a process only hosting activities that are visible to the
// user, so we'd prefer they don't disappear.
static final int VISIBLE_APP_ADJ = 1;
// This is the process running the current foreground app. We'd really
// rather not kill it!
static final int FOREGROUND_APP_ADJ = 0;
// This is a process that the system or a persistent process has bound to,
// and indicated it is important.
static final int PERSISTENT_SERVICE_ADJ = -11;
// This is a system persistent process, such as telephony. Definitely
// don't want to kill it, but doing so is not completely fatal.
static final int PERSISTENT_PROC_ADJ = -12;
// The system process runs at the default adjustment.
static final int SYSTEM_ADJ = -16;
// Special code for native processes that are not being managed by the system (so
// don't have an oom adj assigned by the system).
static final int NATIVE_ADJ = -17;
2. Android Low Memory Killer
Android系统内存不足时，系统会杀掉一部分进程以释放空间，谁生谁死的这个生死大权就是由LMK所决定的，这就是Android系统中的Low Memory Killer，其基于Linux的OOM机制,其阈值定义如下面所示的lowmemorykiller文件中，当然也可以通过系统的init.rc实现自定义。
lowmemorykiller.c
static uint32_t lowmem_debug_level = 1;
static int lowmem_adj[6] = {
0,
1,
6,
12,
};
static int lowmem_adj_size = 4;
static int lowmem_minfree[6] = {
3 * 512, /* 6MB */
2 * 1024, /* 8MB */
4 * 1024, /* 16MB */
16 * 1024, /* 64MB */
};
static int lowmem_minfree_size = 4;
① 在Low Memory Killer中通过进程的oom_adj与占用内存的大小决定要杀死的进程，oom_adj值越小越不容易被杀死。其中，lowmem_minfree是杀进程的时机，谁被杀，则取决于lowmem_adj，具体值得含义参考上面 Android进程优先级 所述.
② 在init.rc中定义了init进程（系统进程）的oom_adj为-16，其不可能会被杀死(init的PID是1)，而前台进程是0（这里的前台进程是指用户正在使用的Activity所在的进程），用户按Home键回到桌面时的优先级是6，普通的Service的进程是8.
init.rc
# Set init and its forked children's oom_adj.
write /proc/1/oom_adj -16
关于Low Memory Killer的具体实现原理可参考Ref-2.
3. 查看某个App的进程
步骤（手机与PC连接）
- adb shell
- ps | grep 进程名
- cat /proc/pid/oom_adj //其中pid是上述grep得到的进程号
4. Android账号和同步机制
属于Android中较偏冷的知识，具体参考 Ref 3/4/5
二、现有方法
1. 网络连接保活方法
a. GCM
b. 公共的第三方push通道(信鸽等)
c. 自身跟服务器通过轮询，或者长连接
具体实现请参考 微信架构师杨干荣的"微信Android客户端后台保活经验分享" （Ref-1）.
2. 双service 提高进程优先级
思路：（API level > 18 ）
- 应用启动时启动一个假的Service（FakeService）, startForeground()，传一个空的Notification
- 启动真正的Service（AlwaysLiveService），startForeground()，注意必须相同Notification ID
- FakeService stopForeground()
效果：通过adb查看,运行在后台的服务其进程号变成了1（优先级仅次于前台进程）
风险：Android系统前台service的一个漏洞，可能在6.0以上系统中修复
实现：核心代码如下
AlwaysLiveService 常驻内存服务
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
startForeground(R.id.notify, new Notification());
startService(new Intent(this, FakeService.class));
return super.onStartCommand(intent, flags, startId);
}
FakeService 临时服务
public class FakeService extends Service {
@Nullable
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
startForeground(R.id.notify, new Notification());
stopSelf();
return super.onStartCommand(intent, flags, startId);
}
@Override
public void onDestroy() {
stopForeground(true);
super.onDestroy();
}
}
3. 守护进程及时拉起
AlarmReceiver， ConnectReceiver，BootReceiver等
三、新方法(AccountSyncAdapter)
1. 思路：
利用Android系统提供的账号和同步机制实现
2. 效果：
- 通过adb查看,运行在后台的服务其进程号变成了1（优先级仅次于前台进程），能提高进程优先级，对比如下图
正常情况
采用AccountSyncAdapter方法后
- 进程被系统kill后，可以由syn拉起
3. 风险：
- SyncAdapter时间进度不高，往往会因为手机处于休眠状态，而时间往后调整，同步间隔最低为1分钟
- 用户可以单独停止或者删除，有些手机账号默认是不同步的，需要手动开启
4. 实现：核心代码如下
① 建立数据同步系统（ContentProvider）
通过一个ContentProvider用来作数据同步，由于并没有实际数据同步，所以此处就直接建立一个空的ContentProvider即可
public class XXAccountProvider extends ContentProvider {
public static final String AUTHORITY = "包名.provider";
public static final String CONTENT_URI_BASE = "content://" + AUTHORITY;
public static final String TABLE_NAME = "data";
public static final Uri CONTENT_URI = Uri.parse(CONTENT_URI_BASE + "/" + TABLE_NAME);
@Override
public boolean onCreate() {
return true;
}
@Nullable
@Override
public Cursor query(Uri uri, String[] projection, String selection,
String[] selectionArgs, String sortOrder) {
return null;
}
@Nullable
@Override
public String getType(Uri uri) {
return new String();
}
@Nullable
@Override
public Uri insert(Uri uri, ContentValues values) {
return null;
}
@Override
public int delete(Uri uri, String selection, String[] selectionArgs) {
return 0;
}
@Override
public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
return 0;
}
}
然后再Manifest中声明
<provider
android:name="**.XXAccountProvider"
android:authorities="@string/account_auth_provider"
android:exported="false"
android:syncable="true"/>
② 建立Sync系统 (SyncAdapter)
通过实现SyncAdapter这个系统服务后, 利用系统的定时器对程序数据ContentProvider进行更新，具体步骤为：
- 创建Sync服务
public class XXSyncService extends Service {
private static final Object sSyncAdapterLock = new Object();
private static XXSyncAdapter sSyncAdapter = null;
@Override
public void onCreate() {
synchronized (sSyncAdapterLock) {
if (sSyncAdapter == null) {
sSyncAdapter = new XXSyncAdapter(getApplicationContext(), true);
}
}
}
@Override
public IBinder onBind(Intent intent) {
return sSyncAdapter.getSyncAdapterBinder();
}
static class XXSyncAdapter extends AbstractThreadedSyncAdapter {
public XXSyncAdapter(Context context, boolean autoInitialize) {
super(context, autoInitialize);
}
@Override
public void onPerformSync(Account account, Bundle extras, String authority, ContentProviderClient provider, SyncResult syncResult) {
getContext().getContentResolver().notifyChange(XXAccountProvider.CONTENT_URI, null, false);
}
}
}
- 声明Sync服务
<service
android:name="**.XXSyncService"
android:exported="true"
android:process=":core">
<intent-filter>
<action
android:name="android.content.SyncAdapter"/>
</intent-filter>
<meta-data
android:name="android.content.SyncAdapter"
android:resource="@xml/sync_adapter"/>
</service>
其中sync_adapter为：
<sync-adapter xmlns:android="http://schemas.android.com/apk/res/android"
android:accountType="@string/account_auth_type"
android:allowParallelSyncs="false"
android:contentAuthority="@string/account_auth_provide"
android:isAlwaysSyncable="true"
android:supportsUploading="false"
android:userVisible="true"/>
参数说明：
android:contentAuthority 指定要同步的ContentProvider在其AndroidManifest.xml文件中有个android:authorities属性。
android:accountType 表示进行同步的账号的类型。
android:userVisible 设置是否在“设置”中显示
android:supportsUploading 设置是否必须notifyChange通知才能同步
android:allowParallelSyncs 是否支持多账号同时同步
android:isAlwaysSyncable 设置所有账号的isSyncable为1
android:syncAdapterSettingsAction 指定一个可以设置同步的activity的Action。
- 账户调用Sync服务
首先配置好Account（第三步），然后再通过ContentProvider实现
手动更新
public void triggerRefresh() {
Bundle b = new Bundle();
b.putBoolean(ContentResolver.SYNC_EXTRAS_MANUAL, true);
b.putBoolean(ContentResolver.SYNC_EXTRAS_EXPEDITED, true);
ContentResolver.requestSync(
account,
CONTENT_AUTHORITY,
b);
}
添加账号
Account account = AccountService.GetAccount();
AccountManager accountManager = (AccountManager) context.getSystemService(Context.ACCOUNT_SERVICE);
accountManager.addAccountExplicitly(...)
同步周期设置
ContentResolver.setIsSyncable(account, CONTENT_AUTHORITY, 1);
ContentResolver.setSyncAutomatically(account, CONTENT_AUTHORITY, true);
ContentResolver.addPeriodicSync(account, CONTENT_AUTHORITY, new Bundle(), SYNC_FREQUENCY);
③ 建立账号系统 (Account Authenticator)
通过建立Account账号，并关联SyncAdapter服务实现同步
- 创建Account服务
public class XXAuthService extends Service {
private XXAuthenticator mAuthenticator;
@Override
public void onCreate() {
mAuthenticator = new XXAuthenticator(this);
}
private XXAuthenticator getAuthenticator() {
if (mAuthenticator == null)
mAuthenticator = new XXAuthenticator(this);
return mAuthenticator;
}
@Override
public IBinder onBind(Intent intent) {
return getAuthenticator().getIBinder();
}
class XXAuthenticator extends AbstractAccountAuthenticator {
private final Context context;
private AccountManager accountManager;
public XXAuthenticator(Context context) {
super(context);
this.context = context;
accountManager = AccountManager.get(context);
}
@Override
public Bundle addAccount(AccountAuthenticatorResponse response, String accountType, String authTokenType, String[] requiredFeatures, Bundle options)
throws NetworkErrorException {
// 添加账号 示例代码
final Bundle bundle = new Bundle();
final Intent intent = new Intent(context, AuthActivity.class);
intent.putExtra(AccountManager.KEY_ACCOUNT_AUTHENTICATOR_RESPONSE, response);
bundle.putParcelable(AccountManager.KEY_INTENT, intent);
return bundle;
}
@Override
public Bundle getAuthToken(AccountAuthenticatorResponse response, Account account, String authTokenType, Bundle options)
throws NetworkErrorException {
// 认证 示例代码
String authToken = accountManager.peekAuthToken(account, getString(R.string.account_token_type));
//if not, might be expired, register again
if (TextUtils.isEmpty(authToken)) {
final String password = accountManager.getPassword(account);
if (password != null) {
//get new token
authToken = account.name + password;
}
}
//without password, need to sign again
final Bundle bundle = new Bundle();
if (!TextUtils.isEmpty(authToken)) {
bundle.putString(AccountManager.KEY_ACCOUNT_NAME, account.name);
bundle.putString(AccountManager.KEY_ACCOUNT_TYPE, account.type);
bundle.putString(AccountManager.KEY_AUTHTOKEN, authToken);
return bundle;
}
//no account data at all, need to do a sign
final Intent intent = new Intent(context, AuthActivity.class);
intent.putExtra(AccountManager.KEY_ACCOUNT_AUTHENTICATOR_RESPONSE, response);
intent.putExtra(AuthActivity.ARG_ACCOUNT_NAME, account.name);
bundle.putParcelable(AccountManager.KEY_INTENT, intent);
return bundle;
}
@Override
public String getAuthTokenLabel(String authTokenType) {
// throw new UnsupportedOperationException();
return null;
}
@Override
public Bundle editProperties(AccountAuthenticatorResponse response, String accountType) {
return null;
}
@Override
public Bundle confirmCredentials(AccountAuthenticatorResponse response, Account account, Bundle options)
throws NetworkErrorException {
return null;
}
@Override
public Bundle updateCredentials(AccountAuthenticatorResponse response, Account account, String authTokenType, Bundle options)
throws NetworkErrorException {
return null;
}
@Override
public Bundle hasFeatures(AccountAuthenticatorResponse response, Account account, String[] features)
throws NetworkErrorException {
return null;
}
}
}
- 声明Account服务
<service
android:name="**.XXAuthService"
android:exported="true"
android:process=":core">
<intent-filter>
<action
android:name="android.accounts.AccountAuthenticator"/>
</intent-filter>
<meta-data
android:name="android.accounts.AccountAuthenticator"
android:resource="@xml/authenticator"/>
</service>
其中authenticator为：
<?xml version="1.0" encoding="utf-8"?>
<account-authenticator xmlns:android="http://schemas.android.com/apk/res/android"
android:accountType="@string/account_auth_type"
android:icon="@drawable/icon"
android:smallIcon="@drawable/icon"
android:label="@string/app_name"
/>
- 使用Account服务
同SyncAdapter，通过AccountManager使用申请Token主要是通过 AccountManager.getAuthToken系列方法
添加账号则通过 AccountManager.addAccount
查看是否存在账号通过 AccountManager.getAccountsByType
Refs
-
Android developer
By SkySeraph-2016
