今天研究了一下Android APK管理器代码,发现还是比较简单的,主要就是两个列表,一个显示SD卡上面的APK文件的list,一个显示已经安装的app的list。
1:获取SD卡上的APK安装文件后,要用代码读出APK里面的信息,如icon等,的主要代码如下:
private void getUninatllApkInfo(Context context, String apkPath) {
String PATH_PackageParser = "android.content.pm.PackageParser";
String PATH_AssetManager = "android.content.res.AssetManager";
try {
// apk包的文件路径
// 这是一个Package 解释器, 是隐藏的
// 构造函数的参数只有一个, apk文件的路径
// PackageParser packageParser = new PackageParser(apkPath);
Class pkgParserCls = Class.forName(PATH_PackageParser);
Class[] typeArgs = new Class[1];
typeArgs[0] = String.class;
Constructor pkgParserCt = pkgParserCls.getConstructor(typeArgs);
Object[] valueArgs = new Object[1];
valueArgs[0] = apkPath;
Object pkgParser = pkgParserCt.newInstance(valueArgs);
Log.d("ANDROID_LAB", "pkgParser:" + pkgParser.toString());
// 这个是与显示有关的, 里面涉及到一些像素显示等等, 我们使用默认的情况
DisplayMetrics metrics = new DisplayMetrics();
metrics.setToDefaults();
typeArgs = new Class[4];
typeArgs[0] = File.class;
typeArgs[1] = String.class;
typeArgs[2] = DisplayMetrics.class;
typeArgs[3] = Integer.TYPE;
Method pkgParser_parsePackageMtd = pkgParserCls.getDeclaredMethod(
"parsePackage", typeArgs);
valueArgs = new Object[4];
valueArgs[0] = new File(apkPath);
valueArgs[1] = apkPath;
valueArgs[2] = metrics;
valueArgs[3] = 0;
Object pkgParserPkg = pkgParser_parsePackageMtd.invoke(pkgParser,
valueArgs);
// 应用程序信息包, 这个公开的, 不过有些函数, 变量没公开
// ApplicationInfo info = mPkgInfo.applicationInfo;
Field appInfoFld = pkgParserPkg.getClass().getDeclaredField(
"applicationInfo");
ApplicationInfo info = (ApplicationInfo) appInfoFld
.get(pkgParserPkg);
// uid 输出为"-1",原因是未安装,系统未分配其Uid。
Log
.d("ANDROID_LAB", "pkg:" + info.packageName + " uid="
+ info.uid);
Class assetMagCls = Class.forName(PATH_AssetManager);
Constructor assetMagCt = assetMagCls.getConstructor((Class[]) null);
Object assetMag = assetMagCt.newInstance((Object[]) null);
typeArgs = new Class[1];
typeArgs[0] = String.class;
Method assetMag_addAssetPathMtd = assetMagCls.getDeclaredMethod(
"addAssetPath", typeArgs);
valueArgs = new Object[1];
valueArgs[0] = apkPath;
assetMag_addAssetPathMtd.invoke(assetMag, valueArgs);
Resources res = context.getResources();
typeArgs = new Class[3];
typeArgs[0] = assetMag.getClass();
typeArgs[1] = res.getDisplayMetrics().getClass();
typeArgs[2] = res.getConfiguration().getClass();
Constructor resCt = Resources.class.getConstructor(typeArgs);
valueArgs = new Object[3];
valueArgs[0] = assetMag;
valueArgs[1] = res.getDisplayMetrics();
valueArgs[2] = res.getConfiguration();
res = (Resources) resCt.newInstance(valueArgs);
CharSequence label = null;
if (info.labelRes != 0) {
label = res.getText(info.labelRes);
}
Log.d("ANDROID_LAB", "label=" + label);
// 这里就是读取一个apk程序的图标
if (info.icon != 0) {
this.icon = res.getDrawable(info.icon);
appName = label.toString();
packageName = info.packageName;
}
} catch (Exception e) {
e.printStackTrace();
}
}
icon就是这个APK的图标,appName就是这个apk的名称,packageName就是这个apk的包名。
2:下面是如何获取所有的已经安装的非系统app的代码:
private ArrayList<InstalledAppInfo> getInstalledApps() {
ArrayList<InstalledAppInfo> res = new ArrayList<InstalledAppInfo>();
List<PackageInfo> packs = getPackageManager().getInstalledPackages(0);
for (int i = 0; i < packs.size(); i++) {
PackageInfo p = packs.get(i);
if((p.applicationInfo.flags & ApplicationInfo.FLAG_SYSTEM) > 0){
continue;
}
InstalledAppInfo newInfo = new InstalledAppInfo();
newInfo.setAppname(p.applicationInfo.loadLabel(getPackageManager())
.toString());
newInfo.setPname(p.packageName);
newInfo.setVersionName(p.versionName);
newInfo.setVersionCode(p.versionCode);
newInfo.setIcon(p.applicationInfo.loadIcon(getPackageManager()));
res.add(newInfo);
}
return res;
}
其中的
if((p.applicationInfo.flags & ApplicationInfo.FLAG_SYSTEM) > 0){
continue;
}
作用是过滤掉system app。