获取已安装的程序和APK文件的信息

对于APK文件

PackageManager mPackageManager = getPackageManager();
PackageInfo p = mPackageManager.getPackageArchiveInfo(<file path>, 0);

if (p != null) {
	ApplicationInfo appInfo = p.applicationInfo;
	String appname = mPackageManager.getApplicationLabel(appInfo)
			.toString();
	String packageName = p.packageName;
	String versionName = p.versionName;
	Drawable icon = mPackageManager.getApplicationIcon(appInfo);
}

对于已安装的程序

// get all installed application
PackageManager mPackageManager = getPackageManager();
List<PackageInfo> packs = mPackageManager.getInstalledPackages(0);

int size = packs.size();
for (int i = 0; i < size; i++) {
	PackageInfo p = packs.get(i);

	if (p.applicationInfo.sourceDir.startsWith("/system/app")) {
		// ignore system application
		continue;
	}

	// get application detail
	ApplicationInfo appInfo = p.applicationInfo;
	String appname = mPackageManager.getApplicationLabel(appInfo)
			.toString();
	String packageName = p.packageName;
	String versionName = p.versionName;
	Drawable icon = mPackageManager.getApplicationIcon(appInfo);
}