Android ActivityManager常用方法

/**

• 获取最前端应用的包名

• PERMISSION_REQUIRED:NULL

• RESULT:23 com.demo.activitymanager

• @param context

• @return

*/

private String getTopAppPackage(Context context) {

// if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP)

ActivityManager activityManager = (ActivityManager) context

.getSystemService(Context.ACTIVITY_SERVICE);

ComponentName componentName = activityManager.getRunningTasks(1).get(0).topActivity;

return Build.VERSION.SDK_INT + “\n getTopPackage:”

• componentName.getPackageName();

}

获取栈顶Activity及其所属进程

---

/**

• 获取栈顶Activity及其所属进程

• PERMISSION_REQUIRED:NULL

• RESULT:MainActivity,com.demo.activitymanager

• @param context

• @return

*/

public static String getTopActivityNameAndProcessName(Context context) {

String processName = null;

String topActivityName = null;

ActivityManager activityManager = (ActivityManager) context

.getSystemService(android.content.Context.ACTIVITY_SERVICE);

List runningTaskInfos = activityManager

.getRunningTasks(1);

if (runningTaskInfos != null) {

ComponentName f = runningTaskInfos.get(0).topActivity;

String topActivityClassName = f.getClassName();

String temp[] = topActivityClassName.split(“\.”);

// 栈顶Activity的名称

topActivityName = temp[temp.length - 1];

int index = topActivityClassName.lastIndexOf(“.”);

// 栈顶Activity所属进程的名称

processName = topActivityClassName.substring(0, index);

}

return “\n\n getTopActivityNameAndProcessName:” + topActivityName + “,”

• processName;

}

获取应用的进程信息

---

/**

• 获取应用的进程信息

• PERMISSION_REQUIRED:NULL

• RESULT:processName=com.demo.activitymanager pid=4317 uid=10311

• memorySize=1696kb

• @param context

• @return

*/

private String getRunningAppProcessInfo(Context context) {

String result = “\n\n getRunningAppProcessInfo:”;

ActivityManager activityManager = (ActivityManager) context

.getSystemService(Context.ACTIVITY_SERVICE);

// 获得系统里正在运行的所有进程

List runningAppProcessesList = activityManager

.getRunningAppProcesses();

for (RunningAppProcessInfo runningAppProcessInfo : runningAppProcessesList) {

int pid = runningAppProcessInfo.pid; // 进程ID号

int uid = runningAppProcessInfo.uid; // 《Android学习笔记总结+最新移动架构视频+大厂安卓面试真题+项目实战源码讲义》无偿开源 徽信搜索公众号【编程进阶路】 用户ID

String processName = runningAppProcessInfo.processName; // 进程名

int[] pids = new int[] { pid };

Debug.MemoryInfo[] memoryInfo = activityManager

.getProcessMemoryInfo(pids);

int memorySize = memoryInfo[0].dalvikPrivateDirty; // 占用的内存

result += “\n\tprocessName=” + processName + “\tpid=” + pid

• “\tuid=” + uid + “\tmemorySize=” + memorySize + “kb”;

}

return result;

}

是否在前台

---

/**

• 是否正在前台

• @return

*/

public boolean isRunningForeground() {

String packageName = getPackageName(this);

String topActivityClassName = getTopActivityName(this);

System.out.println(“packageName=” + packageName

• “,topActivityClassName=” + topActivityClassName);