如何检测应用程序是否已启动或启动？

Question

我必须从图标中检测该应用程序已启动多少次，或者从多任务视图重新回到该应用程序的最前面。 我怎么做？

Answer 1

在您的onCreate（）方法中，从SharedPreferences中读取计数器，将其递增并保存。

在您的onResume（）方法中，对其他计数器执行相同的操作。

Answer 2

这堂课可以给你很大帮助

以下是一些示例代码

RunningTaskInfo foregroundTaskInfo = am.getRunningTasks(1).get(0); String foregroundTaskPackageName = foregroundTaskInfo .topActivity.getPackageName();
                        PackageManager pm = ForegroundAppService.this.getPackageManager();
                        PackageInfo foregroundAppPackageInfo;

                            foregroundAppPackageInfo = pm.getPackageInfo(foregroundTaskPackageName, 0);
                             String foregroundTaskAppName = foregroundAppPackageInfo.applicationInfo.loadLabel(pm).toString();
                             Drawable appicon=getPackageManager().getApplicationIcon(foregroundTaskPackageName);
                             iv.setImageDrawable(appicon); //                            Log.d("Foreground task ",foregroundTaskAppName); //                             Log.d("Size ",tasklist.size()+"");
                             Log.d("App Icon ------------------------------->",appicon+"");
                             if(Globals.tasklist.size()>=1)
                             {   String value="";
                             i=0;
                                 for(HashMap<String, String> map: Globals.tasklist) {
                                     Log.d("map ",map.get("appname"));

                                     for(String str:map.keySet())
                                     {
                                         Log.d("str ",str);
                                         String key=str;
                                         value=map.get(str);
                                         Log.d("Foreground App Name ",foregroundTaskAppName);
                                         Log.d("Existing List Value   ",value);

                                        if(value.equals(foregroundTaskAppName))
                                             {

                                                flag=false;
                                                Log.d("time ",map.get("apptime"));
                                                foregroundAppTime = timeIncrement(Integer.parseInt(map.get("apptime")));
                                                map.put("apptime", Integer.toString(foregroundAppTime));
                                                Log.d("time ",map.get("apptime")); ////                                             Log.d("Previous Time ",tasklist.get(key)+"");
                                                HashMap<String,String> hs=new HashMap<String,String>();
                                                hs=Globals.tasklist.get(i);
                                                Set set=hs.entrySet();
                                                Iterator ii = set.iterator();

                                                 if(ii.hasNext()) {
                                                     Map.Entry me = (Map.Entry)ii.next();
                                                     Log.d("Task -----------> ",me.getKey()+"");
                                                     Log.d("Time ----------->",me.getValue()+"");
                                                      //                                                     try //                                                  { //                                                    foregroundAppTime= timeIncrement((int)me.getValue()); //                                                    } //                                                    catch(Exception ex){Log.d("Error ",ex.getMessage());} //                                                    hs.put("apptime", Integer.toString(foregroundAppTime)); //                                                  Globals.tasklist.add(i, hs);
                                                 }
                                                 //                                             Globals.appinfo.put("appname", foregroundTaskAppName); //                                                Globals.appinfo.put("apptime", Integer.toString(foregroundAppTime)); //                                                 Globals.tasklist.add(Globals.appinfo);
                                                break;
                                             }
                                             else
                                             {
                                                 flag=true;
                                             }
                                    }
                                     if(flag==false)
                                     {
                                         break;
                                     }
                                     i++;
                                 }

                                 if(flag)
                                 {
                                     Log.d("Foreground App Name in End ",foregroundTaskAppName);
                                     HashMap<String, String> appinfo = new HashMap<String, String>();
                                     appinfo.put("appname", foregroundTaskAppName);
                                    appinfo.put("apptime", "0");
                                     Globals.tasklist.add(appinfo);

                                 }

                             }
                             else
                             {
                                 HashMap<String, String> appinfo = new HashMap<String, String>();
                                appinfo.put("appname", foregroundTaskAppName);
                                appinfo.put("apptime", "0");
                                 Globals.tasklist.add(appinfo);
                             }
                        } catch (Exception e) {
                            // TODO Auto-generated catch block
                            Log.d("Error ",e.getMessage());
                        }
                        Log.d("Running Task " ,"---------------Start-----------------");

                         for(HashMap<String, String> map: Globals.tasklist) {
                             for(String str:map.keySet())
                             {
                                 String key=str;
                                 String value=map.get(str);
                                 Log.d("Key ",key);
                                 Log.d("Value ",value);
                             }
                         }


                    Log.d("Running Task " ,"---------------End-----------------");
                }}, 0, 1000);   



          return START_STICKY;
       }

       int timeIncrement(int time)
       {
           time++; //          Log.d("New Time ",time+"");
           return time;
       }