Android6.0关于预置三方app卸载(一) copy到data/app下
2016-09-22 10:58
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我们知道每个手机会预装一些三方的应用,但我们需要用户把这些应用删除的权限。这可怎么操作呢,我们在编译的时候可以把应用放在data/app下,但是这样的话,手机一恢复出厂设置预留应用就没有了。这篇博客我们就来解决这个问题。
先看下apk的编译时放在了third_app下,
功能如下,就是把system/third-app下面的apk复制到data/app, 但是在哪里调用这个函数呢?
//install the third apps when system is first boot
private void installThirdApps(){
//the source directory not exists
File storeDir = new File("/system/third_app");
if(!storeDir.exists()){
Log.e(TAG,"/system/third_app is not exist");
return;
}
//get the apk files in /system/third_app
String apkFilesNames[] = storeDir.list();
if(apkFilesNames == null){
Log.e(TAG,"apk file name is null");
return;
}
//copy the apk files to /data/app
boolean installSucc = false;
for(int i = 0; i < apkFilesNames.length; i++){
//Uri srcFileUri = Uri.parse(storeDir+"/"+apkFilesNames[i]);
File srcFile = new File("/system/third_app",apkFilesNames[i]);
Log.e(TAG,"srcFile="+srcFile);
File destFile = new File("/data/app",apkFilesNames[i]);
Log.e(TAG,"destFile="+destFile.toString());
boolean installResult = copyThirdApps(srcFile,destFile);
if(!installResult){
Log.d(TAG,"install failed");
return;
}
}
}
/**
* File copy function.
* It will be used when installThirdApps
* @param srcFile just like '/system/third_app/***.apk'
* @param destDir just like '/data/app/***.apk'
* @return
*/
private boolean copyThirdApps(File srcFile, File destDir) {
//do some check actions
if (srcFile == null || destDir == null || !srcFile.exists()) {
Log.e(TAG, "invalid arguments for movePreinstallApkFile()");
Log.e(TAG, "move " + srcFile + " to " + destDir + " failed");
return false;
}
//create new file
try{
destDir.createNewFile();
}catch(Exception e){
Log.e(TAG, "create file faild! due to:" + e);
return false;
}
//set permission
try{
Runtime.getRuntime().exec("chmod 644 "+destDir.getAbsolutePath());
}catch(Exception e){
Log.e(TAG, "chmod file faild! due to:"+e);
}
//do copy
try{
boolean ret = FileUtils.copyFile(srcFile,destDir);
if(!ret){
Log.e(TAG,"copy file faild!");
return false;
}
}catch(Exception e){
Log.e(TAG, "copy file faild! due to:"+e);
}
return true && destDir.exists();
}
在PKMS的构造函数,开始处理非系统应用的时候,但是一定要在扫描data/app之前,这样才能后面扫描到data/app这些复制进去的app,才会第一次开机安装成功。
那adb install又是如何做到安装应用的,我们来看下代码,下面这段代码是pc侧的
我们来看下install_app这个函数,也是把apk文件push到/data/local/tmp下,然后调用了pm命令安装应用。
看下pm_command函数,是调用了pm install命令来安装应用。
static int pm_command(transport_type transport, const char* serial,
int argc, const char** argv)
{
std::string cmd = "shell:pm";
while (argc-- > 0) {
cmd += " " + escape_arg(*argv++);
}
return send_shell_command(transport, serial, cmd);
}我们来看下pm install的处理,调用了runInstall函数
主要是下面这个函数,system/third_app目录下多了一层目录。
private void installThirdApps(){
//the source directory not exists
File storeDir = new File("/system/third_app");
if(!storeDir.exists()){
Log.e(TAG,"/system/third_app is not exist");
return;
}
//get the apk files in /system/third_app
String apkDirFilesNames[] = storeDir.list();
if(apkDirFilesNames == null){
Log.e(TAG,"apk file name is null");
return;
}
//copy the apk files to /data/app
boolean installSucc = false;
for(int i = 0; i < apkDirFilesNames.length; i++){
File srcFileDir = new File("/system/third_app", apkDirFilesNames[i]);
Log.e(TAG,"srcFile=" + srcFileDir);
String srcFileNames[] = srcFileDir.list();
for(int j = 0; j < srcFileNames.length; j++) {
File srcFile = new File(srcFileDir, srcFileNames[j]);
File destFile = new File("/data/app", srcFileNames[j]);
boolean installResult = copyThirdApps(srcFile, destFile);
if(!installResult){
Log.d(TAG,"install failed");
return;
}
}
}
}
一、安装预置应用方法
这里提供一个思路,把预留应用放在system/third-app下,然后在第一次开机的时候把这些应用copy到data/app下,当然要在PKMS扫描data/app之前,这样第一次开机的时候就能安装上这些应用了。因为应用在data/app下也能删除。因为应用在system/third-app中也有,而恢复出厂设置的时候system的目录不会清空。在恢复出厂设置后,还会把这些应用copy到data/app下(恢复出厂设置开机等于第一次开机),下面我们看下如何实现。先看下apk的编译时放在了third_app下,
include $(CLEAR_VARS) LOCAL_MODULE_PATH := $(TARGET_OUT)/third_app LOCAL_MODULE := MobileMusic LOCAL_MODULE_TAGS := optional LOCAL_MODULE_CLASS := APPS LOCAL_SRC_FILES := $(LOCAL_MODULE).apk LOCAL_CERTIFICATE := PRESIGNED include $(BUILD_PREBUILT)
功能如下,就是把system/third-app下面的apk复制到data/app, 但是在哪里调用这个函数呢?
//install the third apps when system is first boot
private void installThirdApps(){
//the source directory not exists
File storeDir = new File("/system/third_app");
if(!storeDir.exists()){
Log.e(TAG,"/system/third_app is not exist");
return;
}
//get the apk files in /system/third_app
String apkFilesNames[] = storeDir.list();
if(apkFilesNames == null){
Log.e(TAG,"apk file name is null");
return;
}
//copy the apk files to /data/app
boolean installSucc = false;
for(int i = 0; i < apkFilesNames.length; i++){
//Uri srcFileUri = Uri.parse(storeDir+"/"+apkFilesNames[i]);
File srcFile = new File("/system/third_app",apkFilesNames[i]);
Log.e(TAG,"srcFile="+srcFile);
File destFile = new File("/data/app",apkFilesNames[i]);
Log.e(TAG,"destFile="+destFile.toString());
boolean installResult = copyThirdApps(srcFile,destFile);
if(!installResult){
Log.d(TAG,"install failed");
return;
}
}
}
/**
* File copy function.
* It will be used when installThirdApps
* @param srcFile just like '/system/third_app/***.apk'
* @param destDir just like '/data/app/***.apk'
* @return
*/
private boolean copyThirdApps(File srcFile, File destDir) {
//do some check actions
if (srcFile == null || destDir == null || !srcFile.exists()) {
Log.e(TAG, "invalid arguments for movePreinstallApkFile()");
Log.e(TAG, "move " + srcFile + " to " + destDir + " failed");
return false;
}
//create new file
try{
destDir.createNewFile();
}catch(Exception e){
Log.e(TAG, "create file faild! due to:" + e);
return false;
}
//set permission
try{
Runtime.getRuntime().exec("chmod 644 "+destDir.getAbsolutePath());
}catch(Exception e){
Log.e(TAG, "chmod file faild! due to:"+e);
}
//do copy
try{
boolean ret = FileUtils.copyFile(srcFile,destDir);
if(!ret){
Log.e(TAG,"copy file faild!");
return false;
}
}catch(Exception e){
Log.e(TAG, "copy file faild! due to:"+e);
}
return true && destDir.exists();
}
在PKMS的构造函数,开始处理非系统应用的时候,但是一定要在扫描data/app之前,这样才能后面扫描到data/app这些复制进去的app,才会第一次开机安装成功。
if (!mOnlyCore) { EventLog.writeEvent(EventLogTags.BOOT_PROGRESS_PMS_DATA_SCAN_START, SystemClock.uptimeMillis()); if(isFirstBoot()){//判断第一次开机 Log.i(TAG, "It's first boot, install the third apps"); installThirdApps();//安装三方应用(copy到data/app下) } scanDirLI(mAppInstallDir, 0, scanFlags | SCAN_REQUIRE_KNOWN, 0); scanDirLI(mDrmAppPrivateInstallDir, PackageParser.PARSE_FORWARD_LOCK, scanFlags | SCAN_REQUIRE_KNOWN, 0);
二、adb install处理
下面几个问题,我们知道PKMS会在开机的时候扫描data/app,所以一般我们把一个apk push到data/app下的时候,再把手机重启也会安装应用。但是一定要重启。那adb install又是如何做到安装应用的,我们来看下代码,下面这段代码是pc侧的
else if (!strcmp(argv[0], "install")) { if (argc < 2) return usage(); return install_app(ttype, serial, argc, argv); }
我们来看下install_app这个函数,也是把apk文件push到/data/local/tmp下,然后调用了pm命令安装应用。
static int install_app(transport_type transport, const char* serial, int argc, const char** argv) { static const char *const DATA_DEST = "/data/local/tmp/%s"; static const char *const SD_DEST = "/sdcard/tmp/%s"; const char* where = DATA_DEST; int i; struct stat sb; for (i = 1; i < argc; i++) { if (!strcmp(argv[i], "-s")) { where = SD_DEST; } } // Find last APK argument. // All other arguments passed through verbatim. int last_apk = -1; for (i = argc - 1; i >= 0; i--) { const char* file = argv[i]; char* dot = strrchr(file, '.'); if (dot && !strcasecmp(dot, ".apk")) { if (stat(file, &sb) == -1 || !S_ISREG(sb.st_mode)) { fprintf(stderr, "Invalid APK file: %s\n", file); return -1; } last_apk = i; break; } } if (last_apk == -1) { fprintf(stderr, "Missing APK file\n"); return -1; } const char* apk_file = argv[last_apk]; char apk_dest[PATH_MAX]; snprintf(apk_dest, sizeof apk_dest, where, get_basename(apk_file)); int err = do_sync_push(apk_file, apk_dest, 0 /* no show progress */);//把apk文件push到/data/local/tmp/目录下 if (err) { goto cleanup_apk; } else { argv[last_apk] = apk_dest; /* destination name, not source location */ } err = pm_command(transport, serial, argc, argv);//调用了pm命令 cleanup_apk: delete_file(transport, serial, apk_dest); return err; }
看下pm_command函数,是调用了pm install命令来安装应用。
static int pm_command(transport_type transport, const char* serial,
int argc, const char** argv)
{
std::string cmd = "shell:pm";
while (argc-- > 0) {
cmd += " " + escape_arg(*argv++);
}
return send_shell_command(transport, serial, cmd);
}我们来看下pm install的处理,调用了runInstall函数
if ("install".equals(op)) { return runInstall(); }在runInstall函数会调用PKMS的installPackageAsUser函数安装应用
VerificationParams verificationParams = new VerificationParams(verificationURI, originatingURI, referrerURI, VerificationParams.NO_UID, null); mPm.installPackageAsUser(apkFilePath, obs.getBinder(), installFlags, installerPackageName, verificationParams, abi, userId);
三、注意
上面PKMS中把system/third_app下面的apk放在data/app有点问题,原因是android6.0 编译apk文件,会自动生成一个目录,所以代码需要修改一下。主要是下面这个函数,system/third_app目录下多了一层目录。
private void installThirdApps(){
//the source directory not exists
File storeDir = new File("/system/third_app");
if(!storeDir.exists()){
Log.e(TAG,"/system/third_app is not exist");
return;
}
//get the apk files in /system/third_app
String apkDirFilesNames[] = storeDir.list();
if(apkDirFilesNames == null){
Log.e(TAG,"apk file name is null");
return;
}
//copy the apk files to /data/app
boolean installSucc = false;
for(int i = 0; i < apkDirFilesNames.length; i++){
File srcFileDir = new File("/system/third_app", apkDirFilesNames[i]);
Log.e(TAG,"srcFile=" + srcFileDir);
String srcFileNames[] = srcFileDir.list();
for(int j = 0; j < srcFileNames.length; j++) {
File srcFile = new File(srcFileDir, srcFileNames[j]);
File destFile = new File("/data/app", srcFileNames[j]);
boolean installResult = copyThirdApps(srcFile, destFile);
if(!installResult){
Log.d(TAG,"install failed");
return;
}
}
}
}
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