Add StatsActivity

app/src/main/java/com/hippo/app/StatsActivity.java

@@ -0,0 +1,157 @@
+/*
+ * Copyright (C) 2015 Hippo Seven
+ *
+ * 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
+ * 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.hippo.app;
+
+import android.annotation.SuppressLint;
+import android.content.res.Resources;
+import android.os.Bundle;
+import android.os.Debug;
+import android.os.Handler;
+import android.support.v7.app.AppCompatActivity;
+import android.view.Gravity;
+import android.view.ViewGroup;
+import android.widget.FrameLayout;
+import android.widget.TextView;
+
+import com.hippo.ehviewer.Constants;
+import com.hippo.ehviewer.R;
+import com.hippo.util.AppHandler;
+import com.hippo.util.Messenger;
+
+import java.util.Locale;
+
+public abstract class StatsActivity extends AppCompatActivity {
+
+    private static final int DEFAULT_MESSAGE_SIZE = 128;
+    private static final long STATS_CLOCK_INTERVAL_MS = 1000;
+    private static final int BYTES_IN_MEGABYTE = 1024 * 1024;
+
+    private TextView mStatsTextView;
+    private boolean mShowStats;
+    private Runnable mStatsClockTickRunnable;
+    private Handler mHandler;
+
+    private Messenger.Receiver mReceiver = new Messenger.Receiver() {
+        @Override
+        public void onReceive(int id, Object obj) {
+            if (obj instanceof Boolean) {
+                boolean showStats = (Boolean) obj;
+                if (mShowStats != showStats) {
+                    mShowStats = showStats;
+                    ViewGroup vg = (ViewGroup) getWindow().getDecorView();
+                    if (showStats) {
+                        vg.addView(mStatsTextView, generateLayoutParams());
+                        updateStats();
+                        scheduleNextStatsClockTick();
+                    } else {
+                        vg.removeView(mStatsTextView);
+                        cancelNextStatsClockTick();
+                    }
+                }
+            }
+        }
+    };
+
+    @SuppressLint("RtlHardcoded")
+    private ViewGroup.LayoutParams generateLayoutParams() {
+        Resources resources = getResources();
+        FrameLayout.LayoutParams lp = new FrameLayout.LayoutParams(
+                ViewGroup.LayoutParams.WRAP_CONTENT,
+                ViewGroup.LayoutParams.WRAP_CONTENT);
+        lp.gravity = Gravity.TOP | Gravity.RIGHT;
+        lp.topMargin = resources.getDimensionPixelOffset(R.dimen.stats_text_view_padding_top);
+        lp.rightMargin = resources.getDimensionPixelOffset(R.dimen.stats_text_view_padding_top);
+        return lp;
+    }
+
+    protected abstract boolean isShowStats();
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        mStatsTextView = new TextView(this);
+        mHandler = AppHandler.getInstance();
+        mStatsClockTickRunnable = new Runnable() {
+            @Override
+            public void run() {
+                updateStats();
+                scheduleNextStatsClockTick();
+            }
+        };
+        Messenger.getInstance().register(
+                Constants.MESSENGER_ID_SHOW_APP_STATUS, mReceiver);
+
+        if (isShowStats()) {
+            mShowStats = true;
+            ((ViewGroup) getWindow().getDecorView()).addView(mStatsTextView,
+                    generateLayoutParams());
+        } else {
+            mShowStats = false;
+        }
+    }
+
+    @Override
+    protected void onDestroy() {
+        super.onDestroy();
+        Messenger.getInstance().unregister(Constants.MESSENGER_ID_SHOW_APP_STATUS, mReceiver);
+    }
+
+    @Override
+    protected void onResume() {
+        super.onResume();
+
+        if (mShowStats) {
+            updateStats();
+            scheduleNextStatsClockTick();
+        }
+    }
+
+    @Override
+    protected void onPause() {
+        super.onPause();
+
+        if (mShowStats) {
+            cancelNextStatsClockTick();
+        }
+    }
+
+    private void scheduleNextStatsClockTick() {
+        mHandler.postDelayed(mStatsClockTickRunnable, STATS_CLOCK_INTERVAL_MS);
+    }
+
+    private void cancelNextStatsClockTick() {
+        mHandler.removeCallbacks(mStatsClockTickRunnable);
+    }
+
+    private void updateStats() {
+        final Runtime runtime = Runtime.getRuntime();
+        final long heapMemory = runtime.totalMemory() - runtime.freeMemory();
+        final StringBuilder sb = new StringBuilder(DEFAULT_MESSAGE_SIZE);
+        appendSize(sb, "Java heap size:          ", heapMemory, "\n");
+        appendSize(sb, "Native heap size:        ", Debug.getNativeHeapSize(), "\n");
+        mStatsTextView.setText(sb.toString());
+    }
+
+    private static void appendSize(StringBuilder sb, String prefix, long bytes, String suffix) {
+        String value = String.format(Locale.getDefault(), "%.2f", (float) bytes / BYTES_IN_MEGABYTE);
+        appendValue(sb, prefix, value + " MB", suffix);
+    }
+
+    private static void appendValue(StringBuilder sb, String prefix, String value, String suffix) {
+        sb.append(prefix).append(value).append(suffix);
+    }
+}

app/src/main/java/com/hippo/ehviewer/Constants.java

@@ -20,9 +20,11 @@ import com.hippo.util.Messenger;
 public final class Constants {
 
     public static final int MESSENGER_ID_SOURCE;
+    public static final int MESSENGER_ID_SHOW_APP_STATUS;
 
     static {
         Messenger messenger = Messenger.getInstance();
         MESSENGER_ID_SOURCE = messenger.newId();
+        MESSENGER_ID_SHOW_APP_STATUS = messenger.newId();
     }
 }

app/src/main/java/com/hippo/ehviewer/ui/ContentActivity.java

@@ -39,6 +39,11 @@ public class ContentActivity extends StageActivity
     private StatusBarLayout mStatusBarLayout;
     private StageLayout mContentLayout;
 
+    @Override
+    protected boolean isShowStats() {
+        return true;
+    }
+
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);

app/src/main/java/com/hippo/ehviewer/ui/StartActivity.java

@@ -17,20 +17,25 @@ package com.hippo.ehviewer.ui;
 
 import android.content.Intent;
 import android.os.Bundle;
-import android.support.v7.app.AppCompatActivity;
 import android.widget.ImageView;
 import android.widget.TextView;
 
+import com.hippo.app.StatsActivity;
 import com.hippo.ehviewer.R;
 import com.hippo.util.ViewUtils;
 import com.larvalabs.svgandroid.SVG;
 import com.larvalabs.svgandroid.SVGBuilder;
 import com.larvalabs.svgandroid.SVGParseException;
 
-public class StartActivity extends AppCompatActivity {
+public class StartActivity extends StatsActivity {
 
     private static final String TAG = StartActivity.class.getSimpleName();
 
+    @Override
+    protected boolean isShowStats() {
+        return true;
+    }
+
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);

app/src/main/java/com/hippo/scene/StageActivity.java

@@ -19,13 +19,13 @@ import android.content.Intent;
 import android.os.Bundle;
 import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
-import android.support.v7.app.AppCompatActivity;
 import android.util.SparseArray;
 import android.view.View;
 
+import com.hippo.app.StatsActivity;
 import com.hippo.util.IntIdGenerator;
 
-public abstract class StageActivity extends AppCompatActivity {
+public abstract class StageActivity extends StatsActivity {
 
     private IntIdGenerator mActivityResultIdGenerator = IntIdGenerator.create();
     private SparseArray<Scene.ActivityResultListener> mActivityResultListenerMap =