读取asserts 文件中的apk
读取asserts 文件中的apk
任务需要，需要读取asserts文件夹中的apk文件并读取其版本信息和大小，完成后整理如下：
学习借鉴的网址：
1、https://blog.csdn.net/w0100746363/article/details/7276928
2、https://blog.csdn.net/fengyuzhengfan/article/details/38360017
/**
* 筛选asserts文件夹中的apk文件并获取需要更新安装的apk文件的相应信息
**/
private void getApkData() throws IOException {
String[] files = null;
Log.i("silentChange", " ------------------assertmanager");
// 遍历assest文件夹，读取压缩包及安装包
try {
files = getAssets().list("");
} catch (IOException e) {
e.printStackTrace();
}
/** 遍历asserts文件夹中所有文件 **/
if (files.length > 0) {
for (int i = 0; i < files.length; i++) {
String fileName = files[i];
Log.i("silentChange", " fileName: " + fileName);
/** 筛选asserts文件夹中的apk文件 **/
if (fileName.contains(".apk")) {//判断是否为Apk
String apkName = fileName;
String name = apkName.substring(0, apkName.length() - 4);//去除了后缀".apk"的文件名，目前没用到
Log.i("silentChange", " name: " + name);
//不能直接读取assets目录下的Apk信息，所以需要先将其拷贝出来
String s = String.valueOf(this.getCacheDir().getAbsolutePath() + "/");
Log.i("silentChange", " s is " + s);
final String apkcachePath = (new StringBuilder(s)).append(apkName).toString();// 临时文件"/temp.apk"
/** 获取asserts文件夹中对应apk文件的信息 **/
AssetManager assetManager = getAssets();
InputStream fIn = assetManager.open(apkName);
newCopyFile(fIn, apkcachePath);//将apk文件拷贝到临时文件夹中
String apkSize = “”;
PackageManager pm = this.getPackageManager();
PackageInfo packageInfo = pm.getPackageArchiveInfo(apkcachePath, PackageManager.GET_ACTIVITIES);
ApplicationInfo applicationInfo = packageInfo.applicationInfo;
String apkPackageName = applicationInfo.packageName;//读取Apk包名
Log.i("silentChange", "---------apkPackageName is " + apkPackageName);
String versionCode = String.valueOf(packageInfo.versionCode);//读取apk版本号
Log.i("silentChange", " versionCode:" + versionCode);
Log.i("silentChange", " apkName:" + apkName);//读取apk名
File file = new File(apkcachePath);
if(file.exists()){
apkSize = String.valueOf(file.length());
}else {
Log.i("88","file is not exit!!!");
}
Log.i("silentChange", " apkSize:" + apkSize);
}
}
}
//将assert文件夹中的apk文件拷贝到本地缓存 另一种方法
private void newCopyFile(InputStream inputStream, String paramString) throws IOException {
Log.i("silentChange", "--------newCopyFile"+"\n"+"paramString is: "+paramString);
FileOutputStream fileOutputStream = null;
try {
fileOutputStream = new FileOutputStream(paramString);
byte[] buffer = new byte[1024];
int byteRead;
while (-1 != (byteRead = inputStream.read(buffer))) {
fileOutputStream.write(buffer, 0, byteRead);
}
}catch (Exception e) {
e.printStackTrace();
}finally {
File file = new File(paramString);
if (file.exists()) {
fileLength = String.valueOf(file.length());
Log.i("silentChange", " localFile.length() is --" + fileLength);
}else {
Log.i("silentChange", " file is not exit");
}
inputStream.close();
fileOutputStream.flush();
fileOutputStream.close();
}
}