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rengwuxian committed Jul 19, 2017
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9 changes: 9 additions & 0 deletions .gitignore
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*.iml
.gradle
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36 changes: 36 additions & 0 deletions README.md
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![](images/icon.png)

HenCoder 绘制 2 练习项目
===

### 这是什么?

这不是一个独立使用的项目,它是 [HenCoder Android 开发进阶:UI 1-2 Paint 详解](http://hencoder.com/ui-1-2) 的配套练习项目。

### 怎么用?

项目是一个可以直接运行的 Android App 项目,项目运行后,在手机上打开是这样的:

![](images/preview.png)

工程下有一个 `/practice` 目录:

![](images/project_practice.png)

你要做的是就是,在 `/practice` 下的每一个 `PracticeXxxView.java` 文件中写代码,绘制出和页面上半部分相同的效果。例如写 `PracticeDrawColorView.java` 以绘制出 "drawColor()" 标签下的黄色涂色效果。就像这样:

![](images/preview_after.png)

> 当然,没必要做得和示例一毛一样。这是一个练习,而不是一个超级模仿秀,关键是把技能掌握。
如果做不出来,可以参考 `/sample` 目录下的代码:

![](images/project_sample.png)

练习做完,绘制第二期(Paint 详解)的内容也就掌握得差不多了。

### 关于有些方法无效

现在的 Android 默认是开启了硬件加速的,而 Canvas 和 Paint 有一些方法是不支持硬件加速的,你需要把它手动关闭才行。硬件加速的支持情况和手动关闭硬件加速的方法你可以看一下这个 Android 的[官方文档](https://developer.android.com/guide/topics/graphics/hardware-accel.html)

以后我会专门用一节来讲硬件加速和图像的离屏缓冲(off-screen buffer),现在先不多说了。
1 change: 1 addition & 0 deletions app/.gitignore
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/build
32 changes: 32 additions & 0 deletions app/build.gradle
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apply plugin: 'com.android.application'

android {
compileSdkVersion 25
buildToolsVersion "25.0.3"
defaultConfig {
applicationId "com.hencoder.hencoderpracticedraw2"
minSdkVersion 18
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'
}
}
}

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.android.support:appcompat-v7:25.3.1'
compile 'com.android.support.constraint:constraint-layout:1.0.2'
compile 'com.android.support:support-core-ui:25.3.1'
compile 'com.android.support:design:25.3.1'
testCompile 'junit:junit:4.12'
}
25 changes: 25 additions & 0 deletions 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 /Users/rengwuxian/.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
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package com.hencoder.hencoderpracticedraw2;

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.hencoder.hencoderpracticedraw2", appContext.getPackageName());
}
}
20 changes: 20 additions & 0 deletions 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.hencoder.hencoderpracticedraw2">

<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name="com.hencoder.hencoderpracticedraw2.MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>

</manifest>

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