Android 将后台应用切换到前台
最近,实现了安卓发送,通知,然后用户点击通知发送一个广播,在广播中调用自己在后台的应用,显示到前台,
先将如何显示到前台的代码记录如下:
在全局配置文件中添加:
<uses-permission android:name="android.permission.REORDER_TASKS" />
定义一个TgSystem 工具类,专门用于启动调用
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;
}
}
当自己的应用在后台时,将它切换到前台来
在代码中调用如下:
TgSystem.setTopApp(MainActivity.this);
调用第三方应用App,代码如下:
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();
}
}
参考:
https://blog.csdn.net/wangmx1993328/article/details/83007883
https://blog.csdn.net/f110300641/article/details/102951945