使用android studio中遇到的常见问题及解决方法

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本文记录了在使用Android Studio时遇到的四个常见问题及其解决办法：1) 'R'符号无法解析，通过Build -> Clean Project解决；2) 遇到版本号错误，需删除相关文件夹并更新maven-metadata.xml；3) AVD列表加载失败，用/tools/lib/devices.xml替换问题文件；4) maketext()方法调用错误，修正上下文参数为Context。

软件环境：android studio

记录一下自己使用android studio过程中遇到的问题和解决方案

Question 1: "cannot resolve symbol R"

解决方法：Build -> Clean Project

Question 2:"NumberFormatException: Invalid revision: 24.0.0-alpha1"

解决方法：

找到Android sdk安装目录

在sdk/extras/android/m2repository/com/android/support/appcompat-v7文件夹中删除 24.0.0-alpha1 文件夹

并在sdk/extras/android/m2repository/com/android/support/appcompat-v7/maven-metadata.xml文件中删<version>24.0.0-alpha1</version>这一行

Question 3:“Cannot reload AVD list: cvc-enumeration-valid: Value '280dpi' is not facet-valid with respect to enumeration '[ldpi, mdpi, tvdpi, hdpi, xhdpi, 400dpi, xxhdpi, 560dpi, xxxhdpi]'. It must be a value from the enumeration.Error parsing D:\sdkforas\android-sdk-windows\system-images\android-22\android-wear\armeabi-v7a\devices.xmlcvc-enumeration-valid: Value '280dpi' is not facet-valid with respect to enumeration '[ldpi, mdpi, tvdpi, hdpi, xhdpi, 400dpi, xxhdpi, 560dpi, xxxhdpi]'. It must be a value from the enumeration.Error parsing D:\sdkforas\android-sdk-windows\system-images\android-22\android-wear\x86\devices.xml”

解决方法：

找到Android sdk安装目录

用/sdk/tools/lib/devices.xml

替换 system-images\android-22\android-wear\x86\devices.xml

再替换 system-images\android-22\android-wear\armeabi-v7a\devices.xml

Question 4:"can not resolve maketext() method of Toast"

Toast.makeText(this,"start" ,Toast.LENGTH_LONG).show();

error: java: no suitable method found for makeText(idtech.ESDN.ShapeData,java.lang.CharSequence,int) method android.widget.Toast.makeText(android.content.Context,int,int) is not applicable (actual argument idtech.ESDN.ShapeData cannot be converted to android.content.Context by method invocation conversion) method android.widget.Toast.makeText(android.content.Context,java.lang.CharSequence,int) is not applicable (actual argument idtech.ESDN.ShapeData cannot be converted to android.content.Context by method invocation conversion)

解决方法：

改为： Toast.makeText(getApplicationContext(),"start" ,Toast.LENGTH_LONG).show();