Android studio 常见错误修改

一，依赖冲突

All com.android.support libraries must use the exact same version specification (mixing versions can lead to runtime crashes). Found versions 28.0.0, 27.1.1. Examples include com.android.support:animated-vector-drawable:28.0.0 and com.android.support:recyclerview-v7:27.1.1 less... (Ctrl+F1)
There are some combinations of libraries, or tools and libraries, that are incompatible, or can lead to bugs. One such incompatibility is compiling with a version of the Android support libraries that is not the latest version (or in particular, a version lower than your targetSdkVersion).

当我们使用android studio添加一些第三方的依赖库时，很可能会提示上面这个错误。

大致意思就是com.android.support的包版本号要保持一致，但是可能我们自己新建的项目的com.android.support包版本号要高一些，一些第三方的库的com.android.support可能没有及时更新support库，就会出现这个错误。

解决方法（同样的适用于其他的依赖冲突。）

解决方法：

在其存在冲突的module中的build.gradle文件中加入下面代码，原理就是通过遍历所有依赖，并修改指定库的版本号

其中
requested.group == 'com.android.support' com.android.support表示要修改的依赖库

details.useVersion '28.0.0' 28.0.0表示要修改的版本号

android {
    compileSdkVersion 28
    defaultConfig {
        applicationId "cn.ktc.tvmeeting"
        minSdkVersion 21
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
    configurations.all {
        resolutionStrategy.eachDependency { DependencyResolveDetails details ->
            def requested = details.requested
            if (requested.group == 'com.android.support') {
                if (!requested.name.startsWith("multidex")) {
                    details.useVersion '28.0.0'
                }
            }
        }
    }
}