Add security section, backward compatible to API23

app/src/main/java/com/binbin/androidowner/Test.java

@@ -0,0 +1,46 @@
+package com.binbin.androidowner;
+
+import android.app.PendingIntent;
+import android.content.Context;
+import android.content.Intent;
+import android.content.IntentSender;
+import android.content.pm.PackageInstaller;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+
+public class Test {
+    public static void installPackage(Context context, InputStream inputStream)
+            throws IOException {
+        PackageInstaller packageInstaller = context.getPackageManager().getPackageInstaller();
+        int sessionId = packageInstaller.createSession(new PackageInstaller
+                .SessionParams(PackageInstaller.SessionParams.MODE_FULL_INSTALL));
+        PackageInstaller.Session session = packageInstaller.openSession(sessionId);
+
+        long sizeBytes = 0;
+
+        OutputStream out;
+        out = session.openWrite("my_app_session", 0, sizeBytes);
+
+        int total = 0;
+        byte[] buffer = new byte[65536];
+        int c;
+        while ((c = inputStream.read(buffer)) != -1) {
+            total += c;
+            out.write(buffer, 0, c);
+        }
+        session.fsync(out);
+        inputStream.close();
+        out.close();
+
+        // fake intent
+        IntentSender statusReceiver = null;
+        Intent intent = new Intent(context, MainActivity.class);
+        PendingIntent pendingIntent = PendingIntent.getBroadcast(context,
+                1337111117, intent, PendingIntent.FLAG_UPDATE_CURRENT);
+
+        session.commit(pendingIntent.getIntentSender());
+        session.close();
+    }
+}