1 files changed, 149 insertions, 0 deletions
diff --git a/ui/window/DragAndDropAcrossApps/DragSource/src/main/java/com/example/android/common/logger/LogView.java b/ui/window/DragAndDropAcrossApps/DragSource/src/main/java/com/example/android/common/logger/LogView.java
new file mode 100644
index 00000000..f752f339
--- /dev/null
+++ b/ui/window/DragAndDropAcrossApps/DragSource/src/main/java/com/example/android/common/logger/LogView.java
@@ -0,0 +1,149 @@
+/*
+ * Copyright (C) 2013 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 com.example.android.common.logger;
+
+import android.app.Activity;
+import android.content.Context;
+import android.util.AttributeSet;
+import android.widget.TextView;
+
+/**
+ * Simple TextView which is used to output log data received through the LogNode interface.
+ */
+public class LogView extends TextView implements LogNode {
+
+    public LogView(Context context) {
+        super(context);
+    }
+
+    public LogView(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    public LogView(Context context, AttributeSet attrs, int defStyle) {
+        super(context, attrs, defStyle);
+    }
+
+    /**
+     * Formats the log data and prints it out to the LogView.
+     *
+     * @param priority Log level of the data being logged.  Verbose, Error, etc.
+     * @param tag      Tag for for the log data.  Can be used to organize log statements.
+     * @param msg      The actual message to be logged. The actual message to be logged.
+     * @param tr       If an exception was thrown, this can be sent along for the logging
+     *                 facilities
+     *                 to extract and print useful information.
+     */
+    @Override
+    public void println(int priority, String tag, String msg, Throwable tr) {
+
+        String priorityStr = null;
+
+        // For the purposes of this View, we want to print the priority as readable text.
+        switch (priority) {
+            case android.util.Log.VERBOSE:
+                priorityStr = "VERBOSE";
+                break;
+            case android.util.Log.DEBUG:
+                priorityStr = "DEBUG";
+                break;
+            case android.util.Log.INFO:
+                priorityStr = "INFO";
+                break;
+            case android.util.Log.WARN:
+                priorityStr = "WARN";
+                break;
+            case android.util.Log.ERROR:
+                priorityStr = "ERROR";
+                break;
+            case android.util.Log.ASSERT:
+                priorityStr = "ASSERT";
+                break;
+            default:
+                break;
+        }
+
+        // Handily, the Log class has a facility for converting a stack trace into a usable string.
+        String exceptionStr = null;
+        if (tr != null) {
+            exceptionStr = android.util.Log.getStackTraceString(tr);
+        }
+
+        // Take the priority, tag, message, and exception, and concatenate as necessary
+        // into one usable line of text.
+        final StringBuilder outputBuilder = new StringBuilder();
+
+        String delimiter = "\t";
+        appendIfNotNull(outputBuilder, priorityStr, delimiter);
+        appendIfNotNull(outputBuilder, tag, delimiter);
+        appendIfNotNull(outputBuilder, msg, delimiter);
+        appendIfNotNull(outputBuilder, exceptionStr, delimiter);
+
+        // In case this was originally called from an AsyncTask or some other off-UI thread,
+        // make sure the update occurs within the UI thread.
+        ((Activity) getContext()).runOnUiThread((new Thread(new Runnable() {
+            @Override
+            public void run() {
+                // Display the text we just generated within the LogView.
+                appendToLog(outputBuilder.toString());
+            }
+        })));
+
+        if (mNext != null) {
+            mNext.println(priority, tag, msg, tr);
+        }
+    }
+
+    public LogNode getNext() {
+        return mNext;
+    }
+
+    public void setNext(LogNode node) {
+        mNext = node;
+    }
+
+    /**
+     * Takes a string and adds to it, with a separator, if the bit to be added isn't null. Since
+     * the logger takes so many arguments that might be null, this method helps cut out some of the
+     * agonizing tedium of writing the same 3 lines over and over.
+     *
+     * @param source    StringBuilder containing the text to append to.
+     * @param addStr    The String to append
+     * @param delimiter The String to separate the source and appended strings. A tab or comma,
+     *                  for instance.
+     * @return The fully concatenated String as a StringBuilder
+     */
+    private StringBuilder appendIfNotNull(StringBuilder source, String addStr, String delimiter) {
+        if (addStr != null) {
+            if (addStr.length() == 0) {
+                delimiter = "";
+            }
+
+            return source.append(addStr).append(delimiter);
+        }
+        return source;
+    }
+
+    // The next LogNode in the chain.
+    LogNode mNext;
+
+    /** Outputs the string as a new line of log data in the LogView. */
+    public void appendToLog(String s) {
+        append("\n" + s);
+    }
+
+
+}