获取系统上所有可用活动的列表

Question

由于系统应该知道可用的活动，因为它们是在安装过程中评估的相应 AndroidManifest.xml 文件中声明的：
有没有办法查询这些活动？

Answer 1

当然，看看 PackageManager.getInstalledPackages 方法。以下是打印注册活动名称的示例：

List<PackageInfo> pInfos = getPackageManager().getInstalledPackages(PackageManager.GET_ACTIVITIES);
for (PackageInfo pInfo : pInfos) {
  ActivityInfo[] aInfos = pInfo.activities;
  if (aInfos != null) {
    for (ActivityInfo activityInfo : aInfos) {
      Log.i("ACT", activityInfo.name);
      // do whatever else you like... 
    }
  }
}

Answer 2

ArrayList<PackageInfo> res = new ArrayList<PackageInfo>();
PackageManager pm = ctx.getPackageManager();
List<PackageInfo> packs = pm.getInstalledPackages(0);

for(int i=0;i<packs.size();i++) {
    PackageInfo p = packs.get(i);
    String description = (String) p.applicationInfo.loadDescription(pm);
    String  label= p.applicationInfo.loadLabel(pm).toString();
    String packageName = p.packageName;
    String versionName = p.versionName;
    String versionCode = p.versionCode;
    String icon = p.applicationInfo.loadIcon(pm);
//Continue to extract other info about the app...
}

注意：将此权限添加到清单文件中：

<uses-permission android:name="android.permission.GET_TASKS" />

将其添加到上面的代码中：

PackageManager.getactivities -- I have not used this PackageManager.getactivities but I hope it will work for you....