Android O 设备不允许安装第三方APP

屏蔽手动安装APK
vendor/mediatek/proprietary/packages/apps/PackageInstaller/src/com/android/packageinstaller/InstallStart.java

public class InstallStart extends Activity {         ......         if (nextActivity != null) {-            startActivity(nextActivity);+            //startActivity(nextActivity);+            Toast.makeText(InstallStart.this,R.string.not_allowed_install_apk,Toast.LENGTH_SHORT).show();+            Intent result = new Intent();+            result.putExtra(Intent.EXTRA_INSTALL_RESULT,+                    PackageManager.INSTALL_FAILED_INVALID_URI);+            setResult(RESULT_FIRST_USER, result);         }         finish();     }

禁止ADB或第三方商店下载安装
frameworks/base/services/core/java/com/android/server/pm/PackageManagerService.java

+    private  boolean APK_INSTALL_FINISH = false;

 class PackageHandler extends Handler { ...  void doHandleMessage(Message msg) {            switch (msg.what) {                case INIT_COPY: {//add                if(APK_INSTALL_FINISH && getNvRam()){                    return;                    }//end                    HandlerParams params = (HandlerParams) msg.obj;                    int idx = mPendingInstalls.size();

public PackageManagerService(Context context, Installer installer,            boolean factoryTest, boolean onlyCore) {            ......             sMtkSystemServerIns.addBootEvent("Android:PMS_scan_END");            Slog.i(TAG, "Time to scan packages: "                    + ((SystemClock.uptimeMillis()-startTime)/1000f)                    + " seconds");             APK_INSTALL_FINISH = true;//add            // If the platform SDK has changed since the last time we booted,            // we need to re-grant app permission to catch any new ones that

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