Android: Refactor BuildInfo to use less jni and remove StrictMode exception

base/android/java/src/org/chromium/base/BuildInfo.java

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.base;
 
 import android.content.Context;
-import android.content.pm.ApplicationInfo;
 import android.content.pm.PackageInfo;
 import android.content.pm.PackageManager;
 import android.content.pm.PackageManager.NameNotFoundException;
 import android.os.Build;
-import android.os.StrictMode;
 
 import org.chromium.base.annotations.CalledByNative;
 
 /**
  * BuildInfo is a utility class providing easy access to {@link PackageInfo} information. This is
  * primarily of use for accessing package information from native code.
  */
 public class BuildInfo {
     private static final String TAG = "BuildInfo";
     private static final int MAX_FINGERPRINT_LENGTH = 128;
 
     /**
      * BuildInfo is a static utility class and therefore shouldn't be instantiated.
      */
     private BuildInfo() {}
 
     @CalledByNative
-    public static String getDevice() {
-        return Build.DEVICE;
-    }
+    private static String[] getAll() {
+        try {
+            String packageName = ContextUtils.getApplicationContext().getPackageName();
+            PackageManager pm = ContextUtils.getApplicationContext().getPackageManager();
+            PackageInfo pi = pm.getPackageInfo(packageName, 0);
+            String versionCode = pi.versionCode <= 0 ? "" : Integer.toString(pi.versionCode);
+            String versionName = pi.versionName == null ? "" : pi.versionName;
 
-    @CalledByNative
-    public static String getBrand() {
-        return Build.BRAND;
-    }
+            CharSequence label = pm.getApplicationLabel(pi.applicationInfo);
+            String packageLabel = label == null ? "" : label.toString();
 
-    @CalledByNative
-    public static String getAndroidBuildId() {
-        return Build.ID;
+            // Use lastUpdateTime when developing locally, since versionCode does not normally
+            // change in this case.
+            long version = pi.versionCode > 10 ? pi.versionCode : pi.lastUpdateTime;
+            String extractedFileSuffix = String.format("@%s", Long.toHexString(version));
+
+            // Do not alter this list without updating callers of it.
+            return new String[] {
+                    Build.BRAND, Build.DEVICE, Build.ID, Build.MANUFACTURER, Build.MODEL,
+                    String.valueOf(Build.VERSION.SDK_INT), Build.TYPE, packageLabel, packageName,
+                    versionCode, versionName, getAndroidBuildFingerprint(), getGMSVersionCode(pm),
+                    extractedFileSuffix,
+            };
+        } catch (NameNotFoundException e) {
+            throw new RuntimeException(e);
+        }
     }
 
     /**
      * @return The build fingerprint for the current Android install.  The value is truncated to a
      * 128 characters as this is used for crash and UMA reporting, which should avoid huge
      * strings.
      */
-    @CalledByNative
-    public static String getAndroidBuildFingerprint() {
+    private static String getAndroidBuildFingerprint() {
         return Build.FINGERPRINT.substring(
                 0, Math.min(Build.FINGERPRINT.length(), MAX_FINGERPRINT_LENGTH));
     }
 
-    @CalledByNative
-    public static String getDeviceManufacturer() {
-        return Build.MANUFACTURER;
-    }
-
-    @CalledByNative
-    public static String getDeviceModel() {
-        return Build.MODEL;
-    }
-
-    @CalledByNative
-    public static String getGMSVersionCode() {
+    private static String getGMSVersionCode(PackageManager packageManager) {
         String msg = "gms versionCode not available.";
         try {
-            PackageManager packageManager =
-                    ContextUtils.getApplicationContext().getPackageManager();
             PackageInfo packageInfo = packageManager.getPackageInfo("com.google.android.gms", 0);
             msg = Integer.toString(packageInfo.versionCode);
         } catch (NameNotFoundException e) {
             Log.d(TAG, "GMS package is not found.", e);
         }
         return msg;
     }
 
-    @CalledByNative
-    public static String getPackageVersionCode() {
-        String msg = "versionCode not available.";
-        try {
-            PackageManager pm = ContextUtils.getApplicationContext().getPackageManager();
-            PackageInfo pi = pm.getPackageInfo(getPackageName(), 0);
-            msg = "";
-            if (pi.versionCode > 0) {
-                msg = Integer.toString(pi.versionCode);
-            }
-        } catch (NameNotFoundException e) {
-            Log.d(TAG, msg);
-        }
-        return msg;
-    }
-
-    @CalledByNative
     public static String getPackageVersionName() {
-        String msg = "versionName not available";
-        try {
-            PackageManager pm = ContextUtils.getApplicationContext().getPackageManager();
-            PackageInfo pi = pm.getPackageInfo(getPackageName(), 0);
-            msg = "";
-            if (pi.versionName != null) {
-                msg = pi.versionName;
-            }
-        } catch (NameNotFoundException e) {
-            Log.d(TAG, msg);
-        }
-        return msg;
+        return getAll()[10];

[Torne, 2017/04/21 19:41:25]

Can we just retrieve all the values once and save them on the java side as well,
so these functions don't repeatedly call getAll?

[agrieve, 2017/04/21 20:00:33]

We could cache them, but we'd still need to call getAll() to ensure that they
have been cached. 

I figured we should wait to add caching until we deem it to be a slow operation
(otherwise we're trading off RAM & more code for no win)

I certainly agree that calling getAll() is ugly however :/

     }
 
     /** Returns a string that is different each time the apk changes. */
-    @CalledByNative
     public static String getExtractedFileSuffix() {
-        PackageManager pm = ContextUtils.getApplicationContext().getPackageManager();
-        try {
-            PackageInfo pi =
-                    pm.getPackageInfo(ContextUtils.getApplicationContext().getPackageName(), 0);
-            // Use lastUpdateTime when developing locally, since versionCode does not normally
-            // change in this case.
-            long version = pi.versionCode > 10 ? pi.versionCode : pi.lastUpdateTime;
-            return "@" + Long.toHexString(version);
-        } catch (PackageManager.NameNotFoundException e) {
-            throw new RuntimeException(e);
-        }
+        return getAll()[13];
     }
 
-    @CalledByNative
     public static String getPackageLabel() {
-        // Third-party code does disk read on the getApplicationInfo call. http://crbug.com/614343
-        StrictMode.ThreadPolicy oldPolicy = StrictMode.allowThreadDiskReads();
-        try {
-            PackageManager packageManager =
-                    ContextUtils.getApplicationContext().getPackageManager();
-            ApplicationInfo appInfo = packageManager.getApplicationInfo(
-                    getPackageName(), PackageManager.GET_META_DATA);
-            CharSequence label = packageManager.getApplicationLabel(appInfo);
-            return label != null ? label.toString() : "";
-        } catch (NameNotFoundException e) {
-            return "";
-        } finally {
-            StrictMode.setThreadPolicy(oldPolicy);
-        }
+        return getAll()[7];
     }
 
-    @CalledByNative
     public static String getPackageName() {
-        if (ContextUtils.getApplicationContext() == null) {
-            return "";
-        }
         return ContextUtils.getApplicationContext().getPackageName();
     }
 
-    @CalledByNative
-    public static String getBuildType() {
-        return Build.TYPE;
-    }
-
     /**
      * Check if this is a debuggable build of Android. Use this to enable developer-only features.
      */
     public static boolean isDebugAndroid() {
         return "eng".equals(Build.TYPE) || "userdebug".equals(Build.TYPE);
     }
 
-    @CalledByNative
-    public static int getSdkInt() {
-        return Build.VERSION.SDK_INT;
-    }
-
     /**
      * @return Whether the current device is running Android O release or newer.
      */
     public static boolean isAtLeastO() {
         return !"REL".equals(Build.VERSION.CODENAME)
                 && ("O".equals(Build.VERSION.CODENAME) || Build.VERSION.CODENAME.startsWith("OMR"));
     }
 
     /**
      * @return Whether the current app targets the SDK for at least O
      */
     public static boolean targetsAtLeastO(Context appContext) {
         return isAtLeastO()
                 && appContext.getApplicationInfo().targetSdkVersion
                 == Build.VERSION_CODES.CUR_DEVELOPMENT;
     }
 }