1 files changed, 80 insertions, 0 deletions
diff --git a/android/WALT/app/src/main/java/org/chromium/latency/walt/SimpleLogger.java b/android/WALT/app/src/main/java/org/chromium/latency/walt/SimpleLogger.java
new file mode 100644
index 0000000..6059e0f
--- /dev/null
+++ b/android/WALT/app/src/main/java/org/chromium/latency/walt/SimpleLogger.java
@@ -0,0 +1,80 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.chromium.latency.walt;
+
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+import android.content.IntentFilter;
+import android.support.v4.content.LocalBroadcastManager;
+import android.util.Log;
+
+/**
+ * A very simple logger that keeps its data in a StringBuilder. We need on screen log because the
+ * USB port is often taken and we don't have easy access to adb log.
+ */
+public class SimpleLogger {
+    private static final String LOG_INTENT = "log-message";
+    public static final String TAG = "WaltLogger";
+
+    private static final Object LOCK = new Object();
+    private static SimpleLogger instance;
+
+    private StringBuilder sb = new StringBuilder();
+    private LocalBroadcastManager broadcastManager;
+
+    public static SimpleLogger getInstance(Context context) {
+        synchronized (LOCK) {
+            if (instance == null) {
+                instance = new SimpleLogger(context.getApplicationContext());
+            }
+            return instance;
+        }
+    }
+
+    private SimpleLogger(Context context) {
+        broadcastManager = LocalBroadcastManager.getInstance(context);
+    }
+
+    public synchronized void log(String msg) {
+        Log.i(TAG, msg);
+        sb.append(msg);
+        sb.append('\n');
+        if (broadcastManager != null) {
+            Intent intent = new Intent(LOG_INTENT);
+            intent.putExtra("message", msg);
+            broadcastManager.sendBroadcast(intent);
+        }
+    }
+
+    public void registerReceiver(BroadcastReceiver broadcastReceiver) {
+        broadcastManager.registerReceiver(broadcastReceiver, new IntentFilter(LOG_INTENT));
+    }
+
+    public void unregisterReceiver(BroadcastReceiver broadcastReceiver) {
+        broadcastManager.unregisterReceiver(broadcastReceiver);
+    }
+
+    public String getLogText() {
+        return sb.toString();
+    }
+
+    public void clear() {
+        sb = new StringBuilder();
+    }
+
+}