Android判断当前应用是否前台应用

红太狼 2023-05-31 15:25 22阅读 0赞

使用RunningAppProcessInfo来轮询判断，其中魅族手机遇到一个问题，其返回的状态值和其他手机不一样，做了下兼容：

private boolean isAppBackground() {
 boolean isInBackground = true;
 String processName = "empty";
 ActivityManager am = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
 if (Build.VERSION.SDK_INT > Build.VERSION_CODES.KITKAT_WATCH) {
 List<ActivityManager.RunningAppProcessInfo> runningProcesses = am.getRunningAppProcesses();
 for (ActivityManager.RunningAppProcessInfo appProcess : runningProcesses) {
 if (appProcess.processName.equals(getPackageName())) {
 processName = appProcess.processName;
 Global.debug("-===1122====="+processName);
 Global.debug("-===11223====="+appProcess.importance);
 
 if (appProcess.importance == ActivityManager.RunningAppProcessInfo.IMPORTANCE_BACKGROUND) {
 isInBackground = true;
 } else if (appProcess.importance == ActivityManager.RunningAppProcessInfo.IMPORTANCE_PERCEPTIBLE_PRE_26) {
 isInBackground = true;
 } else {
 isInBackground = false;
 }
 }
 
 }
 } else {
 List<ActivityManager.RunningTaskInfo> taskInfo = am.getRunningTasks(1);
 ComponentName componentInfo = taskInfo.get(0).topActivity;
 if (componentInfo.getPackageName().equals(getPackageName())) {
 isInBackground = false;
 }
 Global.debug(componentInfo.getPackageName()+"==2==");
 }
 return isInBackground;
 }

**AndroidProcess的五种状态**

Foreground 当前进程正在运行，可以接受触点

Visible      当前进程正在运行，但是其他一些界面显示在它之上，但是它是可见的

Service     当前进程包含服务正在运行

Background 当前进程在后台运行

Empty      当前是空进程

**Android源码文档中解释**

<table> 
 <tbody> 
 <tr> 
 <td style="vertical-align:top;"> IMPORTANCE_BACKGROUND </td> 
 <td style="vertical-align:top;"> this process process contains background code that is expendable. </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"> IMPORTANCE_EMPTY </td> 
 <td style="vertical-align:top;"> this process is empty of any actively running code. </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"> IMPORTANCE_FOREGROUND </td> 
 <td style="vertical-align:top;"> this process is running the foreground UI. </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"> IMPORTANCE_SERVICE </td> 
 <td style="vertical-align:top;"> this process is contains services that should remain running. </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"> IMPORTANCE_VISIBLE </td> 
 <td style="vertical-align:top;"> this process is running something that is actively visible to the user, though not in the immediate foreground. </td> 
 </tr> 
 </tbody> 
</table>