Error:Execution failed for task ‘:app:preDexDebug‘.
com.android.ide.common.process.ProcessException: org.gradle.process.internal.ExecException: Process ‘command ‘C:\Program Files (x86)\Java\jdk1.7.0_67\bin\java.exe‘‘ finished with non-zero exit value 1
解决办法：
因为同时开了Eclipse,android studio，导致内存占用过多。关闭Eclipse即可。
