今天在支付宝官方下载了一个app支付的demo,结果一运行出现下面的错误
2019-08-15 18:28:58.114 32244-32244/com.alipay.sdk.pay.demo E/AndroidRuntime: FATAL EXCEPTION: main Process: com.alipay.sdk.pay.demo, PID: 32244 java.lang.IllegalStateException: Could not execute method for android:onClick at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:390) at android.view.View.performClick(View.java:6611) at android.view.View.performClickInternal(View.java:6588) at android.view.View.access$3100(View.java:788) at android.view.View$PerformClick.run(View.java:25973) at android.os.Handler.handleCallback(Handler.java:873) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:193) at android.app.ActivityThread.main(ActivityThread.java:6921) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:937) Caused by: java.lang.reflect.InvocationTargetException at java.lang.reflect.Method.invoke(Native Method) at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:385) at android.view.View.performClick(View.java:6611) at android.view.View.performClickInternal(View.java:6588) at android.view.View.access$3100(View.java:788) at android.view.View$PerformClick.run(View.java:25973) at android.os.Handler.handleCallback(Handler.java:873) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:193) at android.app.ActivityThread.main(ActivityThread.java:6921) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:937) Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.String.length()' on a null object reference at java.net.URLEncoder.encode(URLEncoder.java:204) at com.alipay.sdk.pay.demo.util.OrderInfoUtil2_0.getSign(OrderInfoUtil2_0.java:172) at com.alipay.sdk.pay.demo.PayDemoActivity.payV2(PayDemoActivity.java:166) at java.lang.reflect.Method.invoke(Native Method) at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:385) at android.view.View.performClick(View.java:6611) at android.view.View.performClickInternal(View.java:6588) at android.view.View.access$3100(View.java:788) at android.view.View$PerformClick.run(View.java:25973) at android.os.Handler.handleCallback(Handler.java:873) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:193) at android.app.ActivityThread.main(ActivityThread.java:6921) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:937)
麻烦帮我看看,谢谢
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