须要默认屏蔽特定app的通知提示
设置app是否接收通知的界面
点击每一个条目进去的界面

AppNotificationSettings extends SettingsPreferenceFragment
private SwitchPreference mBlock; //条目通过Preference设置
mBlock.setChecked(mAppRow.banned);mBlock.setOnPreferenceChangeListener(new OnPreferenceChangeListener() {@Overridepublic boolean onPreferenceChange(Preference preference, Object newValue) {final boolean block = (Boolean) newValue;return mBackend.setNotificationsBanned(pkg, uid, block);
}});// Users cannot block notifications from system/signature packages//通过工具类推断app是系统包（如计算器）时移除设置通知设置的preferenceif (Utils.isSystemPackage(pm, info)) {getPreferenceScreen().removePreference(mBlock);mPriority.setDependency(null); // don't have it depend on a preference that's gone}

通过对Block的当前状态通过mAppRow设置
对preference状态的监听,通过mBackend实现
import com.android.settings.notification.NotificationAppList.AppRow;
import com.android.settings.notification.NotificationAppList.Backend;

查看NotificationAppList.java

    //对AppRow中的属性进行初始化public static AppRow loadAppRow(PackageManager pm, ApplicationInfo app,Backend backend) {final AppRow row = new AppRow();row.pkg = app.packageName;row.uid = app.uid;try {row.label = app.loadLabel(pm);} catch (Throwable t) {Log.e(TAG, "Error loading application label for " + row.pkg, t);row.label = row.pkg;}row.icon = app.loadIcon(pm);row.banned = backend.getNotificationsBanned(row.pkg, row.uid);// 是否禁止通知row.priority = backend.getHighPriority(row.pkg, row.uid);row.sensitive = backend.getSensitive(row.pkg, row.uid);return row;
}

查看INotificationManager接口
find frameworks/ -name “INotification*”
frameworks/support/v4/java/android/support/v4/app/INotificationSideChannel.aidl
frameworks/base/core/java/com/mediatek/common/mom/INotificationListener.aidl
frameworks/base/core/java/android/app/INotificationManager.aidl
frameworks/base/core/java/android/service/notification/INotificationListener.aidl

.aidl文件（接口定义语言，用于进程间通讯）
frameworks/base/core/java/android/app/INotificationManager.aidl
实现的service路径为
frameworks\base\services\java\com\android\server\NotificationManagerService.java

对接受Notification属性的获取

mService的类型IAppOpsService
frameworks/base/core/java/com/android/internal/app/IAppOpsService.aidl
frameworks/base/services/core/java/com/android/server/AppOpsService.java

返回的值为MODE_IGNORED时，boolean areNotificationsEnabledForPackage(String pkg, int uid)会返回false
mService.checkOperation(op, uid, packageName) = MODE_ALLOWED时。则同意接收通知 ;

对接受Notification的属性设置

@Overridepublic void setNotificationsEnabledForPackage(String pkg, int uid, boolean enabled) {checkCallerIsSystem();setNotificationsEnabledForPackageImpl(pkg, uid, enabled);}

AppOpsManager的路径：frameworks/base/core/java/android/app/AppOpsManager.java

public static final int OP_POST_NOTIFICATION = 11;
uid = app.uid
pkg = app.packageName;
mode = enabled?AppOpsManager.MODE_ALLOWED:AppOpsManager.MODE_IGNORED

查看代码中哪些位置调用了setNotificationsEnabledForPackageImpl方法

除此处还有两处都是对方法的重写与详细实现

详细解决步骤

当须要屏蔽全部应用通知没有例外时
在AppOpsManager中有关于app很多參数设置的默认值，比方图中第十二个就是默认对app的通知开启或关闭。AppOpsService中的checkOperation方法下就进行了推断。当op为空时。返回的时默认的MODE。

所以讲原本的MODE_ALLOWED改为MODE_IGNORED后。编译frameworks/base后push进手机重新启动就会发现全部app全部被屏蔽通知没有例外。

当有特定的app须要开启通知时，我们能够在checkOperation中进行改动。

   @Overridepublic int checkOperation(int code, int uid, String packageName) {verifyIncomingUid(uid);verifyIncomingOp(code);synchronized (this) {if (isOpRestricted(uid, code, packageName)) {return AppOpsManager.MODE_IGNORED;}Op op = getOpLocked(AppOpsManager.opToSwitch(code), uid, packageName, false);if (op == null) {return AppOpsManager.opToDefaultMode(code);}return op.mode;}
}

在checkOperation中进行推断时须要推断code值。否则easy出现点击重新启动的状况。改动后代码例如以下。

public int checkOperation(int code, int uid, String packageName) {verifyIncomingUid(uid);verifyIncomingOp(code);synchronized (this) {//chenzilong add for ZELY-41 block app notifications 20160331 startif(code == AppOpsManager.OP_POST_NOTIFICATION){if ((packageName.equals("com.advan.advanstore")||packageName.equals("com.stkj.android.freeshare"))){return AppOpsManager.MODE_ALLOWED;}else{return AppOpsManager.MODE_IGNORED;}}// chenzilong add for ZELY-41 block app notifications 20160331 endif (isOpRestricted(uid, code, packageName)) {return AppOpsManager.MODE_IGNORED;}Op op = getOpLocked(AppOpsManager.opToSwitch(code), uid, packageName, false);if (op == null) {return AppOpsManager.opToDefaultMode(code);}return op.mode;}

最后的实现结果