軟體環境：android studio

記錄一下自己使用android studio過程中遇到的問題和解決方案

Question 1: "cannot resolve symbol R"

解決方法：Build -> Clean Project

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

解決方法：

找到Android sdk安裝目錄

在sdk/extras/android/m2repository/com/android/support/appcompat-v7資料夾中刪除 24.0.0-alpha1 資料夾

並在sdk/extras/android/m2repository/com/android/support/appcompat-v7/maven-metadata.xml檔案中刪<version>24.0.0-alpha1</version>這一行

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.

解決方法：

找到Android sdk安裝目錄

用/sdk/tools/lib/devices.xml

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

再替換   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)

解決方法：

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