Added perf quickstart.

Change-Id: I4f4ced1315edb4ed334d5f87d1ccd0047448af4b

perf/.gitignore

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+.gradle
+*.iml
+/.idea/libraries
+/.idea/workspace.xml
+.DS_Store
+/build
+/local.properties
+.idea/
+google-services.json

perf/app/.gitignore

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+/build

perf/app/build.gradle

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+apply plugin: 'com.android.application'
+apply plugin: 'com.google.firebase.firebase-perf'
+
+android {
+    compileSdkVersion 25
+    buildToolsVersion "25.0.3"
+    defaultConfig {
+        applicationId "com.google.firebase.quickstart.perfmon"
+        minSdkVersion 19
+        targetSdkVersion 25
+        versionCode 1
+        versionName "1.0"
+        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+    }
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+        }
+    }
+}
+
+android.applicationVariants.all {
+    // Set this to false to disable Firebase Performance Monitoring at compile time
+    FirebasePerformance {
+        instrumentationEnabled true
+    }
+}
+
+dependencies {
+    compile fileTree(dir: 'libs', include: ['*.jar'])
+        androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
+        exclude group: 'com.android.support', module: 'support-annotations'
+    })
+    compile 'com.google.firebase:firebase-core:10.2.6'
+    compile 'com.google.firebase:firebase-perf:10.2.6'
+    compile 'com.github.bumptech.glide:glide:3.7.0'
+    compile 'com.android.support:support-v4:25.3.1'
+    compile 'com.android.support:appcompat-v7:25.3.1'
+    compile 'com.android.support.constraint:constraint-layout:1.0.2'
+    testCompile 'junit:junit:4.12'
+}
+
+apply plugin: 'com.google.gms.google-services'

perf/app/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# By default, the flags in this file are appended to flags specified
+# in /usr/local/google/home/gkal/Android/Sdk/tools/proguard/proguard-android.txt
+# You can edit the include path and order by changing the proguardFiles
+# directive in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# Add any project specific keep options here:
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

perf/app/src/androidTest/java/com/google/firebase/quickstart/perfmon/ExampleInstrumentedTest.java

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+package com.google.firebase.quickstart.perfmon;
+
+import android.content.Context;
+import android.support.test.InstrumentationRegistry;
+import android.support.test.runner.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import static org.junit.Assert.*;
+
+/**
+ * Instrumentation test, which will execute on an Android device.
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+@RunWith(AndroidJUnit4.class)
+public class ExampleInstrumentedTest {
+    @Test
+    public void useAppContext() throws Exception {
+        // Context of the app under test.
+        Context appContext = InstrumentationRegistry.getTargetContext();
+
+        assertEquals("com.google.firebase.quickstart.perfmon", appContext.getPackageName());
+    }
+}

perf/app/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.google.firebase.quickstart.perfmon">
+
+    <application
+        android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/AppTheme">
+        <activity android:name=".MainActivity">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

perf/app/src/main/assets/default_content.txt

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+This is the main text content.
+
+Here are some random strings:
+x3EIZZm4Z0J0ngq2S3L1jf2wr4DW
+H0OnfpDjhRZMAbV9hLFMUTrjqhoV
+KUuRv6ulGEme3layWx86qQrzHt1p
+J5Qfx737fBhfOAobnt9CxilIgPQ2

perf/app/src/main/java/com/google/firebase/quickstart/perfmon/MainActivity.java

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+package com.google.firebase.quickstart.perfmon;
+
+import android.graphics.drawable.ColorDrawable;
+import android.os.AsyncTask;
+import android.support.v4.content.ContextCompat;
+import android.support.v7.app.AppCompatActivity;
+import android.os.Bundle;
+import android.util.Log;
+import android.view.View;
+import android.widget.Button;
+import android.widget.ImageView;
+import android.widget.TextView;
+import android.widget.Toast;
+
+import com.bumptech.glide.Glide;
+import com.bumptech.glide.load.resource.drawable.GlideDrawable;
+import com.bumptech.glide.request.RequestListener;
+import com.bumptech.glide.request.target.Target;
+import com.google.firebase.perf.FirebasePerformance;
+import com.google.firebase.perf.metrics.Trace;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.Random;
+import java.util.concurrent.CountDownLatch;
+
+public class MainActivity extends AppCompatActivity {
+    private static final String TAG = "MainActivity";
+    private ImageView mHeader;
+    private TextView mContent;
+    private Trace mTrace;
+    private String STARTUP_TRACE_NAME = "startup_trace";
+    private String REQUESTS_COUNTER_NAME = "requests sent";
+    private String FILE_SIZE_COUNTER_NAME = "file size";
+    private CountDownLatch mNumStartupTasks = new CountDownLatch(2);
+    private final String DEFAULT_CONTENT_FILE = "default_content.txt";
+    private final String CONTENT_FILE = "content.txt";
+    private final String IMAGE_URL =
+            "https://www.google.com/images/branding/googlelogo/2x/googlelogo_color_272x92dp.png";
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+
+        mHeader = (ImageView) findViewById(R.id.imageView);
+        mContent = (TextView) findViewById(R.id.textView);
+        Button button = (Button) findViewById(R.id.button);
+        button.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                // write 40 chars of random text to file
+                File contentFile = new File(MainActivity.this.getFilesDir(), CONTENT_FILE);
+                new WriteToFileTask(contentFile.getAbsolutePath()).execute(getRandomString(40) + "\n");
+            }
+        });
+
+        // Begin tracing app startup tasks.
+        mTrace = FirebasePerformance.getInstance().newTrace(STARTUP_TRACE_NAME);
+        Log.d(TAG, "Starting trace");
+        mTrace.start();
+        loadImageFromWeb();
+        // Increment the counter of number of requests sent in the trace.
+        Log.d(TAG, "Incrementing number of requests counter in trace");
+        mTrace.incrementCounter(REQUESTS_COUNTER_NAME);
+        loadFileFromDisk();
+        // Wait for app startup tasks to complete asynchronously and stop the trace.
+        new Thread(new Runnable() {
+            @Override
+            public void run() {
+                try {
+                    mNumStartupTasks.await();
+                } catch (InterruptedException e) {
+                    Log.e(TAG, "Unable to wait for startup task completion.");
+                } finally {
+                    Log.d(TAG, "Stopping trace");
+                    mTrace.stop();
+                    MainActivity.this.runOnUiThread(new Runnable() {
+                        @Override
+                        public void run() {
+                            Toast.makeText(MainActivity.this, "Trace completed",
+                                    Toast.LENGTH_SHORT).show();
+                        }
+                    });
+                }
+            }
+        }).start();
+    }
+
+    private void loadImageFromWeb() {
+        Glide.with(this).
+                load(IMAGE_URL)
+                .placeholder(new ColorDrawable(ContextCompat.getColor(this, R.color.colorAccent)))
+                .listener(new RequestListener<String, GlideDrawable>() {
+                    @Override
+                    public boolean onException(Exception e, String model, Target<GlideDrawable> target, boolean isFirstResource) {
+                        mNumStartupTasks.countDown(); // Signal end of image load task.
+                        return false;
+                    }
+
+                    @Override
+                    public boolean onResourceReady(GlideDrawable resource, String model, Target<GlideDrawable> target, boolean isFromMemoryCache, boolean isFirstResource) {
+                        mNumStartupTasks.countDown(); // Signal end of image load task.
+                        return false;
+                    }
+                }).into(mHeader);
+    }
+
+    private void loadFileFromDisk() {
+        new AsyncTask<Void, Void, Boolean>(){
+            private String fileContent;
+
+            @Override
+            protected Boolean doInBackground(Void... params) {
+                File contentFile = new File(MainActivity.this.getFilesDir(), CONTENT_FILE);
+                try {
+                    if (contentFile.createNewFile()) {
+                        // Content file exist did not exist in internal storage and new file was created.
+                        // Copy in the default content.
+                        InputStream is;
+                        is = getAssets().open(DEFAULT_CONTENT_FILE);
+                        int size = is.available();
+                        byte[] buffer = new byte[size];
+                        is.read(buffer);
+                        is.close();
+                        FileOutputStream fos = new FileOutputStream(contentFile);
+                        fos.write(buffer);
+                        fos.close();
+                    }
+                    FileInputStream fis = new FileInputStream(contentFile);
+                    byte[] content = new byte[(int) contentFile.length()];
+                    fis.read(content);
+                    fileContent = new String(content);
+                    return true;
+
+                } catch (IOException e) {
+                    return false;
+                }
+            }
+
+            @Override
+            protected void onPostExecute(Boolean result) {
+                super.onPostExecute(result);
+                if (!result) {
+                    Log.e(TAG, "Couldn't read text file.");
+                    Toast.makeText(MainActivity.this, getString(R.string.text_read_error),
+                            Toast.LENGTH_LONG).show();
+                    return;
+                }
+                mContent.setText(fileContent);
+                // Increment a counter with the file size that was read.
+                Log.d(TAG, "Incrementing file size counter in trace");
+                mTrace.incrementCounter(FILE_SIZE_COUNTER_NAME, fileContent.getBytes().length);
+                mNumStartupTasks.countDown();
+            }
+        }.execute();
+    }
+
+    private String getRandomString(int length) {
+        char[] chars = "abcdefghijklmnopqrstuvwxyz".toCharArray();
+        StringBuilder sb = new StringBuilder();
+        Random random = new Random();
+        for (int i = 0; i < length; i++) {
+            char c = chars[random.nextInt(chars.length)];
+            sb.append(c);
+        }
+        return sb.toString();
+    }
+
+    private class WriteToFileTask extends AsyncTask<String, Void, Void> {
+        private String filename;
+
+        WriteToFileTask(String filename) {
+            this.filename = filename;
+        }
+
+        @Override
+        protected Void doInBackground(String... params) {
+            String content = params[0];
+            try (FileOutputStream fos = new FileOutputStream(filename, true)){
+                fos.write(content.getBytes());
+            } catch (IOException e) {
+                Log.e(TAG, "Unable to write to file: " + filename);
+                Log.e(TAG, Log.getStackTraceString(e));
+            }
+            return null;
+        }
+
+        @Override
+        protected void onPostExecute(Void aVoid) {
+            super.onPostExecute(aVoid);
+            loadFileFromDisk();
+        }
+    }
+}