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This a my first gist note.

printf("Hello world.")

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public class SDcardService extends Service {
    @Override
    public IBinder onBind(Intent intent) {
        // Return the communication channel to the service.
        throw new UnsupportedOperationException("Not yet implemented");
    }

    @Override
    public void onCreate() {
        IntentFilter intentFilter = new IntentFilter(Intent.ACTION_MEDIA_MOUNTED);

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# Built application files
/*/build/

# Crashlytics configuations
com_crashlytics_export_strings.xml

# Local configuration file (sdk path, etc)
local.properties

# Gradle generated files

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/*
 * Copyright (C) 2006 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

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<android.support.v7.widget.Toolbar
    xmlns:app="schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@color/primaryColor"
    android:contentInsetLeft="0dp"
    android:contentInsetStart="0dp"
    app:contentInsetLeft="0dp"
    app:contentInsetStart="0dp"
    android:contentInsetRight="0dp"

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<!--Refer to: http://stackoverflow.com/questions/20862258/android-how-to-get-appcompat-translucent-type-theme-with-support-actionbar-->

<!-- /res/values/styles.xml -->
<style name="Theme.AppCompat.Translucent">
    <item name="android:windowNoTitle">true</item>
    <item name="android:windowBackground">@android:color/transparent</item>
    <item name="android:colorBackgroundCacheHint">@null</item>
    <item name="android:windowIsTranslucent">true</item>
    <item name="android:windowAnimationStyle">@android:style/Animation</item>
</style>

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import android.app.AlertDialog;

// Refer to: http://stackoverflow.com/questions/1979369/android-activity-as-a-dialog
public class DialogThemeActivity extends Activity {
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        
        new AlertDialog.Builder(this)
                .setTitle("title")

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/**
 * Returns a pseudorandom, uniformly distributed int value between 0 (inclusive) and
 * the specified value (exclusive), drawn from this random number generator's sequence.
 * 返回一个在 [0, n-1] 之间均匀分布的伪随机数.
 * 
 * @return [0, n-1]
 */
int nextInt(int n);

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<!-- http://stackoverflow.com/questions/30674648/android-design-support-tablayout-overlapping-content -->
<android.support.design.widget.CoordinatorLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/main_content"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <android.support.design.widget.AppBarLayout
        android:id="@+id/appbar"

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/**
 * Method #0：操作符（或者说关键字）instanceof
 * object 是 C 的实例吗？
 */
if (object instanceof C)
    ;

/**
 * Method #1: isInstance(Object object)
 * Tests whether the given object can be cast to the class represented by this Class.