参考文章：https://blog.csdn.net/loongembedded/article/details/54090873 只有使用特定签名签的apk才可以安装，其他任何apk都不能安装
最好是应用预装一个使用对应签名的应用
需要修改的文件有以下几个 /frameworks/base/services/core/java/com/android/server/pm/PackageManagerService.java
/frameworks/base/core/java/android/content/pmPackageManager.java
/packages/apps/PackageInstaller/src/com/android/packageinstaller/InstallAppProgress.java
/packages/apps/PackageInstaller/res/values/string.xml
1 PackageManagerService.java
/frameworks/base/services/core/java/com/android/server/pm/PackageManagerService.java 添加getSignaturesByPackage()方法
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//add start
private Signature[] getSignaturesByPackage(){
Signature[] signatures = null;
//已签名的已安装应用包名，与该应用签名不同的应用无法安装
String packageName = "com.xxxx.xxxxx";
PackageSetting ps = mSettings.mPackages.get(packageName);
if (ps != null) {
PackageParser.Package pkg = ps.pkg;
if (pkg == null) {
pkg = new PackageParser.Package(packageName);
pkg.applicationInfo.packageName = packageName;
pkg.applicationInfo.flags = ps.pkgFlags | ApplicationInfo.FLAG_IS_DATA_ONLY;
pkg.applicationInfo.publicSourceDir = ps.resourcePathString;
pkg.applicationInfo.sourceDir = ps.codePathString;
pkg.applicationInfo.dataDir = getDataPathForPackage(packageName, 0).getPath();
// pkg.applicationInfo.nativeLibraryDir = ps.nativeLibraryPathString;
}
PackageInfo packageInfo2 = generatePackageInfo(pkg, PackageManager.GET_SIGNATURES, UserHandle.getCallingUserId());
if(packageInfo2 != null){
signatures = packageInfo2.signatures;
}
}
mIsInstallApkFlag = false;
return signatures;
}
//add end
在scanPackageLI方法下加入如下代码
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private PackageParser.Package scanPackageLI(PackageParser.Package pkg, int parseFlags , int scanFlags, long currentTime, UserHandle user) throws PackageManagerException {
boolean success = false;
//add start
//获得安装的应用的签名信息
Signature[] originalSignatures = getSignaturesByPackage();
if (originalSignatures != null) {
if (compareSignatures(originalSignatures, pkg.mSignatures) != PackageManager.SIGNATURE_MATCH) {
int mLastScanError = PackageManager.INSTALL_FAILED_INVALID_SIGNATURES;
throw new PackageManagerException(mLastScanError,
"禁止安装，签名不符");
}
}
//add end
...
同时要import缺少的类。
2 PackageManager.java
/frameworks/base/core/java/android/content/pm/PackageManager.java 加入错误代码 INSTALL_FAILED_INVALID_SIGNATURES
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/**
* Installation return code: this is passed to the {@link IPackageInstallObserver} by
* {@link #installPackage(android.net.Uri, IPackageInstallObserver, int)} if
* the installed package hasn't the expected signature
* @hide
*/
public static final int INSTALL_FAILED_INVALID_SIGNATURES = -26;
3 InstallAppProgress.java
/packages/apps/PackageInstaller/src/com/android/packageinstaller/InstallAppProgress.java 加入针对添加的错误代码的处理
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private Handler mHandler = new Handler() {
public void handleMessage(Message msg) {
switch (msg.what) {
...
//add start
} else if (msg.arg1 == PackageManager.INSTALL_FAILED_INVALID_SIGNATURES){
// Generic error handling for all other error codes.
centerTextDrawable.setLevel(1);
centerExplanationLabel = getExplanationFromErrorCode(msg.arg1);
//centerTextLabel = R.string.install_failed_invalid_signature;
centerTextLabel = R.string.install_failed_invalid_signature;
mLaunchButton.setVisibility(View.INVISIBLE);
//add end
} else {
// Generic error handling for all other error codes.
centerTextDrawable.setLevel(1);
centerExplanationLabel = getExplanationFromErrorCode(msg.arg1);
centerTextLabel = R.string.install_failed;
mLaunchButton.setVisibility(View.INVISIBLE);
}
}
}
4 strings.xml
/packages/apps/PackageInstaller/res/values/string.xml 添加错误信息install_failed_invalid_signature
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<string name="install_failed_invalid_signature">禁止安装，签名不符</string>
