主要利用两个信息类：PackageInfo、ApplicationInfo
一、获取应用PackageInfo信息
以下packageManager都用这个表示
PackageManager packageManager = context.getPackageManager()；
获取方式
==获取不同信息主要是传入不同的flag值==
//第一个参数传入应用包名，
//第二个参数是一个flag表示你想要获取哪些信息，比如下例的activity信息及activity标签下的metadata信息
PackageInfo packageInfo = packageManager.getPackageInfo(packageName, PackageManager.GET_ACTIVITIES | PackageManager.GET_META_DATA)；
具体信息获取
1、权限信息(AndroidManifest中<uses-permission/>标签中信息列表)
String[] permisions = packageManager.getPackageInfo(packageName, PackageManager.GET_PERMISSIONS).requestedPermissions；
2、版本信息
PackageInfo packageInfo = packageManager.getPackageInfo(packageName, 0)；
String versionName = packageInfo.versionName；
int versionCode = packageInfo.versionCode；
3、其他信息
比如sharedUserId、packageName等等
二、获取ApplicationInfo信息
获取方式
//由上述packageInfo中获取得到
ApplicationInfo applicationInfo = packageInfo.applicationInfo；
具体信息获取
1、应用名称
String appName = (String) applicationInfo.loadLabel(packageManager);
2、应用图标
Drawable appIcon = applicationInfo.loadIcon(packageManager)；
3、其他信息
比如taskAffinity、processName、theme等
三、获取组件信息(ActivityInfo、ServiceInfo、ProviderInfo)
ActvitityInfo
==Activity或者BroadcastReceiver信息都是通过ActivityInfo获取的==
获取方式
//flag值必须包含PackageManager.GET_ACTIVITIES，如果还要获取其他信息如metadata则增加一个flag值PackageManager.GET_META_DATA
PackageInfo packageInfo = packageManager.getPackageInfo(packageName,PackageManager.GET_ACTIVITIES);
//activity信息
ActivityInfo[] activities = packageInfo.activities;
//flag值必须包含PackageManager.GET_RECEIVERS，如果还要获取其他信息如metadata则增加一个flag值PackageManager.GET_META_DATA
PackageInfo packageInfo = packageManager.getPackageInfo(packageName,PackageManager.GET_RECEIVERS);
//broadcastreceiver信息
ActivityInfo[] receivers = packageInfo.receivers
具体信息获取
1、activity全路径
String activityClassName = activityInfo.name;
2、其他信息
比如theme、launchMode、taskAffinity等
ServiceInfo
Service信息通过ServiceInfo获取
获取方式
//flag值必须包含PackageManager.GET_SERVICES，如果还要获取其他信息如metadata则增加一个flag值PackageManager.GET_META_DATA
PackageInfo packageInfo = packageManager.getPackageInfo(packageName,PackageManager.GET_SERVICES);
ServiceInfo[] services = packageInfo.services;
具体信息获取
比如flags、permission
ProviderInfo
ContentProvider信息通过ProviderInfo获取
获取方式
//flag值必须包含PackageManager.GET_PROVIDERS，如果还要获取其他信息如metadata则增加一个flag值PackageManager.GET_META_DATA
PackageInfo packageInfo = packageManager.getPackageInfo(packageName,PackageManager.GET_PROVIDERS);
ServiceInfo[] services = packageInfo.services;
具体信息获取
比如authority、readPermission、writePermission等
四、使用实例
1、根据包名获取应用信息
//首先获取packageManager
PackageManager packageManager = context.getPackageManager();
//获取packageInfo信息
PackageInfo packageInfo = packageManager.getPackageInfo(packageName, 0);
//获取应用版本号
int versionCode = packageInfo.versionCode;
//获取应用版本名
String versionName = packageInfo.versionName;
//获取应用名称
String appName = (String) packageInfo.applicationInfo.loadLabel(packageManager);
//获取应用图标
Drawable appIcon = packageInfo.applicationInfo.loadIcon(packageManager)
//<application/>标签下metadata获取
ApplicationInfo applicationInfo = packageManager.getApplicationInfo(packageName, PackageManager.GET_META_DATA);
Bundle metadata = applicationInfo.metaData;//然后通过改bundle获取相应值，用法见bundle
//<activity/>标签下metadata获取(其他service\receiver\provider同理，切换flag即可)
//入口信息获取
PackageInfo packageInfo = packageManager.getPackageInfo(packageName, PackageManager.GET_ACTIVITIES | PackageManager.GET_META_DATA);
ActivityInfo[] activityInfos = packageInfo.activities;
for (ActivityInfo activityInfo : activityInfos) {
Bundle metadata = activityInfo.metaData;//然后通过改bundle获取相应值，用法
见bundle
String activityClassName = activityInfo.name;
}
2、扩展（直接获取未安装apk信息）
PackageManager packageManager = context.getPackageManager();
//apkPath传入apk绝对路径
PackageInfo pInfo = packageManager.getPackageArchiveInfo(apkPath, PackageManager.GET_ACTIVITIES);
if (pInfo != null) {
//包名
String packageName = pInfo.packageName;
//版本名
String versionCode = pInfo.versionName;
//版本号
String versionCode = pInfo.versionCode;
ApplicationInfo appInfo = pInfo.applicationInfo;
/** 必须加这两句，不然下面icon获取是default icon而不是应用包的icon */
appInfo.sourceDir = apkPath;
appInfo.publicSourceDir = apkPath;
//应用名
String appName = appInfo.loadLabel(packageManager).toString();
//应用图标
Drawable appIcon = packageManager.getApplicationIcon(appInfo);
//...其他信息同上获取已安装应用信息一样
}
3、根据包名打开应用LauncherActivity
public static void openApplication(Context context, String packageName) throws Exception {
Intent launcherIntent = new Intent("android.intent.action.MAIN", null);
launcherIntent.addCategory("android.intent.category.LAUNCHER");
launcherIntent.setPackage(packageName);
ResolveInfo localResolveInfo = (ResolveInfo) context.getPackageManager()
.queryIntentActivities(launcherIntent, 0).iterator().next();
if (localResolveInfo != null) {
String str = localResolveInfo.activityInfo.name;
Intent targetIntent = new Intent(Intent.ACTION_MAIN);
targetIntent.addCategory(Intent.CATEGORY_LAUNCHER);
targetIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
targetIntent.setComponent(new ComponentName(packageName, str));
context.startActivity(localIntent2);
}
4、获取所有已安装应用信息
PackageManager packageManager = mContext.getPackageManager();
List<PackageInfo> mPacks = packageManager.getInstalledPackages(0);
for(PackageInfo packageInfo : mPacks) {
//是否是系统应用
boolean isUserApp = (packageInfo.applicationInfo.flags & ApplicationInfo.FLAG_SYSTEM) == 0;
//...同上获取其他信息
}
5、获取应用大小数据
packageManager.getPackageSizeInfo(packageName, new IPackageStatsObserver.Stub() {
@Override
public void onGetStatsCompleted(PackageStats packageStats, boolean b) throws RemoteException {
String package = packageStats.packageName;
long totalSize = packageStats.cacheSize + packageStats.codeSize + packageStats.dataSize;
});
