Activity Manager Service

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Activity Manager Service (AMS) module in openvela’s XMS system. This module is responsible for managing the lifecycle of applications, as well as scheduling tasks and activities.

Table of Contents

• Features
• Examples

Features

• Activity Lifecycle Management: AMS is responsible for managing the lifecycle of activities within applications, including creating, starting, pausing, resuming, and destroying activities.

• Task Management: AMS manages application tasks and stacks, including task switching and scheduling, ensuring a smooth user experience.

• Process Management: AMS is responsible for starting, stopping, and monitoring application processes, ensuring effective utilization of system resources.

• Intent Handling: AMS handles Intent communication between applications, allowing different applications to launch activities and services.

• Permission Management: AMS participates in permission checks to ensure that applications meet system security requirements when launching activities.

• Application State Tracking: AMS tracks the state of applications, such as foreground, background, and stopped, and allocates resources accordingly.

• Multi-Window Support: AMS provides activity management in multi-window mode, allowing multiple applications to be displayed simultaneously.

• Background Task Restrictions: AMS enforces restrictions on background tasks and services to optimize system performance and battery usage.

• Service and Broadcast Management: AMS is also responsible for managing the lifecycle of services and broadcast receivers, ensuring system responsiveness and stability.

Examples

Example code using the Openvela Activity Manager Service (AMS) module typically involves managing activities and controlling tasks through the ActivityManager class. Here are some common examples:

• Starting a New Activity

  Intent intent;
  makeIntent(intent);
  intent.setFlag(intent.mFlag | Intent::FLAG_ACTIVITY_NEW_TASK);
  android::sp<android::IBinder> token = new android::BBinder();
  ActivityManager am;
  am.startActivity(token, intent, -1);

• Stopping an Activity

  Intent intent;
  makeIntent(intent);
  ActivityManager am;
  am.stopActivity(intent, intent.mFlag);