Android 获取应用信息
Android About 3,159 words工具类
public class AppInfoUtil {
private PackageManager mPackageManager;
private Context mContext;
public static final int FILTER_ALL_APP = 0; // 所有应用程序
public static final int FILTER_SYSTEM_APP = 1; // 系统程序
public static final int FILTER_THIRD_APP = 2; // 第三方应用程序
public static final int FILTER_SDCARD_APP = 3; // 安装在SDCard的应用程序
private volatile static AppInfoUtil singleton = null;
public static AppInfoUtil getInstance(Context context) {
if (singleton == null) {
synchronized (FlowUtil.class) {
if (singleton == null) {
singleton = new AppInfoUtil(context);
}
}
}
return singleton;
}
private AppInfoUtil(Context context) {
mContext = context.getApplicationContext();
mPackageManager = mContext.getPackageManager();
}
@SuppressWarnings("deprecation")
public List<AppInfo> queryAppInfo(int filter) {
List<ApplicationInfo> applicationInfos = mPackageManager.getInstalledApplications(PackageManager.GET_UNINSTALLED_PACKAGES);
Collections.sort(applicationInfos,new ApplicationInfo.DisplayNameComparator(mPackageManager));// 排序
List<AppInfo> appInfos = new ArrayList<>(); // 保存过滤查到的AppInfo
// 根据条件来过滤
switch (filter) {
case FILTER_ALL_APP: // 所有应用程序
appInfos.clear();
for (ApplicationInfo app : applicationInfos) {
appInfos.add(getAppInfo(app));
}
return appInfos;
case FILTER_SYSTEM_APP: // 系统程序
appInfos.clear();
for (ApplicationInfo app : applicationInfos) {
if ((app.flags & ApplicationInfo.FLAG_SYSTEM) != 0) {
appInfos.add(getAppInfo(app));
}
}
return appInfos;
case FILTER_THIRD_APP: // 第三方应用程序
appInfos.clear();
for (ApplicationInfo app : applicationInfos) {
if ((app.flags & ApplicationInfo.FLAG_SYSTEM) <= 0) {
appInfos.add(getAppInfo(app));
}
}
break;
case FILTER_SDCARD_APP: // 安装在SDCard的应用程序
appInfos.clear();
for (ApplicationInfo app : applicationInfos) {
if ((app.flags & ApplicationInfo.FLAG_EXTERNAL_STORAGE) != 0) {
appInfos.add(getAppInfo(app));
}
}
return appInfos;
default:
return null;
}
return appInfos;
}
// 构造一个AppInfo对象 ,并赋值
private AppInfo getAppInfo(ApplicationInfo app) {
AppInfo appInfo = new AppInfo();
appInfo.appLabel = (String) app.loadLabel(mPackageManager);
appInfo.appIcon = app.loadIcon(mPackageManager);
appInfo.packageName = (app.packageName);
appInfo.intent = (mPackageManager.getLaunchIntentForPackage(app.packageName));
return appInfo;
}
}
Views: 3,955 · Posted: 2019-04-13
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