[置顶] Android常用功能代码

一、获取系统版本号：
PackageInfo info = this.getPackageManager().getPackageInfo(this.getPackageName(), 0);
int versionCode=nfo.versionCode
string versionName=info.versionNam

二、获取系统信息：
String archiveFilePath=”sdcard/download/Law.apk”;//安装包路径
PackageManager pm = getPackageManager();
PackageInfo info = pm.getPackageArchiveInfo(archiveFilePath, PackageManager.GET_ACTIVITIES);
if(info != null){
ApplicationInfo appInfo = info.applicationInfo;
String appName = pm.getApplicationLabel(appInfo).toString();
String packageName = appInfo.packageName; //得到安装包名称
String version=info.versionName; //得到版本信息
Toast.makeText(test4.this, “packageName:”+packageName+”;version:”+version, Toast.LENGTH_LONG).show();
Drawable icon = pm.getApplicationIcon(appInfo);//得到图标信息
TextView tv = (TextView)findViewById(R.id.tv); //显示图标
tv.setBackgroundDrawable(icon);

三、获取安装路径和已安装程序列表
android中获取当前程序路径
getApplicationContext().getFilesDir().getAbsolutePath()
(2)android取已安装的程序列表
List packageInfoList = getPackageManager().getInstalledPackages(0);

四、获取图片、应用名、包名
PackageManager pManager = MessageSendActivity.this.getPackageManager();
List appList = Utils.getAllApps(MessageSendActivity.this);
for(int i=0;i

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