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本文是自学BuildConfig的一些小知识点,希望对你有所帮助。
原文
android的BuildConfig学习
BuildConfig是什么?
BuildConfig是android在编译过程中自动生成的一个配置文件。
在不同的编译模式下会生成不同的变量,我们可以利用这些变量来方便不同编译环境下的开发,比如日志的打印(开发环境下可以打印Verbose一级,发布环境下可以打印Warn一级)。
BuildConfig有哪些变量?
没有自己变动过gradle文件的话,自动生成的BuildConfig一般如下文所示。
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| public final class BuildConfig { public static final boolean DEBUG = Boolean.parseBoolean("true"); public static final String APPLICATION_ID = "com.xxxx.xxx.xx"; public static final String BUILD_TYPE = "debug"; public static final String FLAVOR = ""; public static final int VERSION_CODE = 1; public static final String VERSION_NAME = "1.0"; }
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BuildConfig在哪里?
如图所示

BuildConfig如何使用?
同java常量。
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| public class MainActivity extends AppCompatActivity { TextView msgText;
@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main);
String lineSep = System.getProperty("line.separator", "\n");
msgText = (TextView) findViewById(R.id.msgText);
String DEBUG = "DEBUG = " + BuildConfig.DEBUG + lineSep; String APPLICATION_ID = "APPLICATION_ID = " + BuildConfig.APPLICATION_ID + lineSep; String BUILD_TYPE = "BUILD_TYPE = " + BuildConfig.BUILD_TYPE + lineSep; String FLAVOR = "FLAVOR = " + BuildConfig.FLAVOR + lineSep; String VERSION_CODE = "VERSION_CODE = " + BuildConfig.VERSION_CODE + lineSep; String VERSION_NAME = "VERSION_NAME = " + BuildConfig.VERSION_NAME;
String msg = DEBUG + APPLICATION_ID + BUILD_TYPE + FLAVOR + VERSION_CODE + VERSION_NAME;
msgText.setText(msg); } }
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BuildConfig可以添加其他变量吗?
可以的。
在app模块的build.gradle中(不是Project的),有个buildTypes节点,我们修改如下。
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| buildTypes { debug { buildConfigField "int", "myInt", "0" buildConfigField "String", "myStr", "\"hello\"" buildConfigField "boolean", "myFlag", "true"
} release { buildConfigField "int", "myInt", "1" buildConfigField "String", "myStr", "\"world\"" buildConfigField "boolean", "myFlag", "true"
minifyEnabled false proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro' } }
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其中myInt
,myStr
,myFlag
是我们自己定义的,编译后的BuildConfig
为
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| public final class BuildConfig { public static final boolean DEBUG = Boolean.parseBoolean("true"); public static final String APPLICATION_ID = "com.qefee.pj.testbuildconfig"; public static final String BUILD_TYPE = "debug"; public static final String FLAVOR = ""; public static final int VERSION_CODE = 1; public static final String VERSION_NAME = "1.0"; public static final boolean myFlag = true; public static final int myInt = 0; public static final String myStr = "hello"; }
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可以看到系统已经为我们生成了.
参考文章