Get mojo_shell building inside chromium checkout.

mojo/shell/android/apk/src/org/chromium/mojo/shell/ShellMain.java

+// Copyright 2013 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.mojo.shell;
+
+import android.app.Activity;
+import android.content.Context;
+import android.util.Log;
+
+import org.chromium.base.CalledByNative;
+import org.chromium.base.JNINamespace;
+
+import java.io.File;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+/**
+ * A placeholder class to call native functions.
+ **/
+@JNINamespace("mojo::shell")
+public class ShellMain {
+    private static final String TAG = "ShellMain";
+
+    // Directory where applications bundled with the shell will be extracted.
+    private static final String LOCAL_APP_DIRECTORY = "local_apps";
+    // Individual applications bundled with the shell as assets.
+    private static final String NETWORK_LIBRARY_APP = "network_service.mojo";
+    // The mojo_shell library is also an executable run in forked processes when running
+    // multi-process.
+    private static final String MOJO_SHELL_EXECUTABLE = "libmojo_shell.so";
+
+    /**
+     * A guard flag for calling nativeInit() only once.
+     **/
+    private static boolean sInitialized = false;
+
+    /**
+     * Initializes the native system.
+     **/
+    static void ensureInitialized(Context applicationContext, String[] parameters) {
+        if (sInitialized) return;
+        try {
+            FileHelper.extractFromAssets(applicationContext, NETWORK_LIBRARY_APP,
+                    getLocalAppsDir(applicationContext), false);
+            File mojoShell = new File(applicationContext.getApplicationInfo().nativeLibraryDir,
+                    MOJO_SHELL_EXECUTABLE);
+
+            List<String> parametersList = new ArrayList<String>();
+            // Program name.
+            if (parameters != null) {
+                parametersList.addAll(Arrays.asList(parameters));
+            }
+
+            nativeInit(applicationContext, mojoShell.getAbsolutePath(),
+                    parametersList.toArray(new String[parametersList.size()]),
+                    getLocalAppsDir(applicationContext).getAbsolutePath(),
+                    getTmpDir(applicationContext).getAbsolutePath());
+            sInitialized = true;
+        } catch (Exception e) {
+            Log.e(TAG, "ShellMain initialization failed.", e);
+            throw new RuntimeException(e);
+        }
+    }
+
+    /**
+     * Starts the specified application in the specified context.
+     *
+     * @return <code>true</code> if an application has been launched.
+     **/
+    static boolean start() {
+        return nativeStart();
+    }
+
+    /**
+     * Adds the given URL to the set of mojo applications to run on start.
+     */
+    static void addApplicationURL(String url) {
+        nativeAddApplicationURL(url);
+    }
+
+    private static File getLocalAppsDir(Context context) {
+        return context.getDir(LOCAL_APP_DIRECTORY, Context.MODE_PRIVATE);
+    }
+
+    private static File getTmpDir(Context context) {
+        return new File(context.getCacheDir(), "tmp");
+    }
+
+    @CalledByNative
+    private static void finishActivity(Activity activity) {
+        activity.finish();
+    }
+
+    /**
+     * Initializes the native system. This API should be called only once per process.
+     **/
+    private static native void nativeInit(Context context, String mojoShellPath,
+            String[] parameters, String bundledAppsDirectory, String tmpDir);
+
+    private static native boolean nativeStart();
+
+    private static native void nativeAddApplicationURL(String url);
+}