Android 系统中如果想要切换系统中的任务,是需要获取系统权限的,在全局配置文件中添加:
<!–排序系统任务权限 重新排序系统Z轴运行中的任务–>
<uses-permission android:name=”android.permission.REORDER_TASKS” />
public class TgSystem { public static void startService(Context context, Intent intent) { if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) { //android8.0以上通过startForegroundService启动service context.startForegroundService(intent); } else { context.startService(intent); } } /** * 判断本地是否已经安装好了指定的应用程序包 * * @param packageNameTarget :待判断的 App 包名,如 微博 com.sina.weibo * @return 已安装时返回 true,不存在时返回 false */ public static boolean appIsExist(Context context, String packageNameTarget) { if (packageNameTarget == null || packageNameTarget.isEmpty()) { return false; } PackageManager packageManager = context.getPackageManager(); List<PackageInfo> packageInfoList = packageManager.getInstalledPackages(PackageManager.MATCH_UNINSTALLED_PACKAGES); for (PackageInfo packageInfo : packageInfoList) { if (packageInfo.packageName.equals(packageNameTarget)) { return true; } } return false; } //当本应用位于后台时,则将它切换到最前端 public static void setTopApp(Context context) { if (isRunningForeground(context)) { return; } //获取ActivityManager ActivityManager activityManager = (ActivityManager) context.getSystemService(ACTIVITY_SERVICE); //获得当前运行的task(任务) List<ActivityManager.RunningTaskInfo> taskInfoList = activityManager.getRunningTasks(100); for (ActivityManager.RunningTaskInfo taskInfo : taskInfoList) { //找到本应用的 task,并将它切换到前台 if (taskInfo.topActivity.getPackageName().equals(context.getPackageName())) { activityManager.moveTaskToFront(taskInfo.id, 0); break; } } } //判断本应用是否已经位于最前端:已经位于最前端时,返回 true;否则返回 false public static boolean isRunningForeground(Context context) { ActivityManager activityManager = (ActivityManager) context.getSystemService(ACTIVITY_SERVICE); List<ActivityManager.RunningAppProcessInfo> appProcessInfoList = activityManager.getRunningAppProcesses(); for (ActivityManager.RunningAppProcessInfo appProcessInfo : appProcessInfoList) { if (appProcessInfo.importance == ActivityManager.RunningAppProcessInfo.IMPORTANCE_FOREGROUND && appProcessInfo.processName.equals(context.getApplicationInfo().processName)) { return true; } } return false; } }
/**最后将被挤压到后台的本应用重新置顶到最前端
* 当自己的应用在后台时,将它切换到前台来*/
TgSystem.setTopApp(MainActivity.this);
private void startLocalApp(String packageNameTarget) {
Log.i(“Wmx logs::”, “———————–开始启动第三方 APP=” + packageNameTarget);
if (SystemHelper.appIsExist(MainActivity.this, packageNameTarget)) {
PackageManager packageManager = getPackageManager();
Intent intent = packageManager.getLaunchIntentForPackage(packageNameTarget);
intent.addCategory(Intent.CATEGORY_LAUNCHER);
intent.setFlags(Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED | Intent.FLAG_ACTIVITY_NEW_TASK);
/**android.intent.action.MAIN:打开另一程序
*/
intent.setAction(“android.intent.action.MAIN”);
/**
* FLAG_ACTIVITY_SINGLE_TOP:
* 如果当前栈顶的activity就是要启动的activity,则不会再启动一个新的activity
*/
intent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
startActivity(intent);
} else {
Toast.makeText(getApplicationContext(), “被启动的 APP 未安装”, Toast.LENGTH_SHORT).show();
}
}
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原文链接:https://blog.csdn.net/wangmx1993328/article/details/83007883