APK安装原理
一 SD卡安装apk详解
首先调用PackageInstallerActivity
//get intent information
final Intent intent = getIntent();
mPackageURI = intent.getData();
mPm = getPackageManager();
mPkgInfo = PackageUtil.getPackageInfo(mPackageURI);
//解析错误当解析清单。中止安装,检查解析错误
// Check for parse errors
if(mPkgInfo == null) {
Log.w(TAG, "Parse error when parsing manifest. Discontinuing installation");
showDialogInner(DLG_PACKAGE_ERROR);
setPmResult(PackageManager.INSTALL_FAILED_INVALID_APK);
return;
}
//set view
setContentView(R.layout.install_start);
mInstallConfirm = findViewById(R.id.install_confirm_panel);
mInstallConfirm.setVisibility(View.INVISIBLE);
PackageUtil.AppSnippet as = PackageUtil.getAppSnippet(this,
mPkgInfo.applicationInfo, mPackageURI);
PackageUtil.initSnippetForNewApp(this, as, R.id.app_snippet);
//处理安装源
// Deal with install source.
String callerPackage = getCallingPackage();
if (callerPackage != null && intent.getBooleanExtra(
Intent.EXTRA_NOT_UNKNOWN_SOURCE, false)) {
try {
mSourceInfo = mPm.getApplicationInfo(callerPackage, 0);
if (mSourceInfo != null) {
if ((mSourceInfo.flags&ApplicationInfo.FLAG_SYSTEM) != 0) {
// System apps don't need to be approved.
initiateInstall();
return;
}
/* for now this is disabled, since the user would need to
* have enabled the global "unknown sources" setting in the
* first place in order to get here.
SharedPreferences prefs = getSharedPreferences(PREFS_ALLOWED_SOURCES,
Context.MODE_PRIVATE);
if (prefs.getBoolean(mSourceInfo.packageName, false)) {
// User has already allowed this one.
initiateInstall();
return;
}
//ask user to enable setting first
showDialogInner(DLG_ALLOW_SOURCE);
return;
*/
}
} catch (NameNotFoundException e) {
}
}
//0 只允许安装在Android市场 ,1 允许安装来自其他来源
//是否应该允许安装包安装器的应用下载安卓市场以外的其他来源
// Check unknown sources.
if (!isInstallingUnknownAppsAllowed()) {
//ask user to enable setting first
showDialogInner(DLG_UNKNOWN_APPS);
return;
}
initiateInstall();
/**
* 判断是否曾经有过同名包的安装
*/
private void initiateInstall() {
String pkgName = mPkgInfo.packageName;
// Check if there is already a package on the device with this name
// but it has been renamed to something else.
String[] oldName = mPm.canonicalToCurrentPackageNames(new String[] { pkgName });
if (oldName != null && oldName.length > 0 && oldName[0] != null) {
pkgName = oldName[0];
mPkgInfo.setPackageName(pkgName);
}
//
// Check if package is already installed. display confirmation dialog if replacing pkg
try {
mAppInfo = mPm.getApplicationInfo(pkgName,
PackageManager.GET_UNINSTALLED_PACKAGES);
} catch (NameNotFoundException e) {
mAppInfo = null;
}
//检查是否已经安装。如果显示确认对话框如果更换包裹
if (mAppInfo == null || getIntent().getBooleanExtra(Intent.EXTRA_ALLOW_REPLACE, false)) {
startInstallConfirm();
} else {
if(localLOGV) Log.i(TAG, "Replacing existing package:"+
mPkgInfo.applicationInfo.packageName);
showDialogInner(DLG_REPLACE_APP);
}
}
/**
* 确认是否需要安装
*/
private void startInstallConfirm() {
LinearLayout permsSection = (LinearLayout) mInstallConfirm.findViewById(R.id.permissions_section);
LinearLayout securityList = (LinearLayout) permsSection.findViewById(
R.id.security_settings_list);
boolean permVisible = false;
if(mPkgInfo != null) {
AppSecurityPermissions asp = new AppSecurityPermissions(this, mPkgInfo);
if(asp.getPermissionCount() > 0) {
permVisible = true;
securityList.addView(asp.getPermissionsView());
}
}
if(!permVisible){
permsSection.setVisibility(View.INVISIBLE);
}
mInstallConfirm.setVisibility(View.VISIBLE);
mOk = (Button)findViewById(R.id.ok_button);
mCancel = (Button)findViewById(R.id.cancel_button);
mOk.setOnClickListener(this);
mCancel.setOnClickListener(this);
}
/**
* 点击OK按钮后经过一系列的安装信息的判断Intent跳转到
* 开始InstallAppProgress实际安装应用程序
*/
public void onClick(View v) {
if(v == mOk) {
// Start subactivity to actually install the application
Intent newIntent = new Intent();
newIntent.putExtra(PackageUtil.INTENT_ATTR_APPLICATION_INFO,
mPkgInfo.applicationInfo);
//appURI传递过去
newIntent.setData(mPackageURI);
newIntent.setClass(this, InstallAppProgress.class);
//安装的包名字
String installerPackageName = getIntent().getStringExtra(Intent.EXTRA_INSTALLER_PACKAGE_NAME);
if (installerPackageName != null) {
newIntent.putExtra(Intent.EXTRA_INSTALLER_PACKAGE_NAME, installerPackageName);
}
if (getIntent().getBooleanExtra(Intent.EXTRA_RETURN_RESULT, false)) {
newIntent.putExtra(Intent.EXTRA_RETURN_RESULT, true);
newIntent.addFlags(Intent.FLAG_ACTIVITY_FORWARD_RESULT);
}
if(localLOGV) Log.i(TAG, "downloaded app uri="+mPackageURI);
startActivity(newIntent);
finish();
} else if(v == mCancel) {
// Cancel and finish
setResult(RESULT_CANCELED);
finish();
}
}
调用这个类进行安装InstallAppProgress
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
Intent intent = getIntent();
mAppInfo = intent.getParcelableExtra(PackageUtil.INTENT_ATTR_APPLICATION_INFO);
mPackageURI = intent.getData();
initView();
}
public void initView() {
setContentView(R.layout.op_progress);
int installFlags = 0;
PackageManager pm = getPackageManager();
try {
PackageInfo pi = pm.getPackageInfo(mAppInfo.packageName,
PackageManager.GET_UNINSTALLED_PACKAGES);
if(pi != null) {
//表明你想替换已经安装的包,如果有的话。
installFlags |= PackageManager.INSTALL_REPLACE_EXISTING;
}
} catch (NameNotFoundException e) {
}
if((installFlags & PackageManager.INSTALL_REPLACE_EXISTING )!= 0) {
Log.w(TAG, "Replacing package:" + mAppInfo.packageName);
}
PackageUtil.AppSnippet as = PackageUtil.getAppSnippet(this, mAppInfo,
mPackageURI);
mLabel = as.label;
PackageUtil.initSnippetForNewApp(this, as, R.id.app_snippet);
mStatusTextView = (TextView)findViewById(R.id.center_text);
mStatusTextView.setText(R.string.installing);
mExplanationTextView = (TextView) findViewById(R.id.center_explanation);
mProgressBar = (ProgressBar) findViewById(R.id.progress_bar);
mProgressBar.setIndeterminate(true);
// Hide button till progress is being displayed
mOkPanel = (View)findViewById(R.id.buttons_panel);
mDoneButton = (Button)findViewById(R.id.done_button);
mLaunchButton = (Button)findViewById(R.id.launch_button);
mOkPanel.setVisibility(View.INVISIBLE);
String installerPackageName = getIntent().getStringExtra(
Intent.EXTRA_INSTALLER_PACKAGE_NAME);
PackageInstallObserver observer = new PackageInstallObserver();
pm.installPackage(mPackageURI, observer, installFlags, installerPackageName);
}