android按钮点击后闪退_Android开发【04-27求助贴】点击button闪退

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这是Logcat日记

04-27 10:35:27.050 11398-11398/shiep.dxxy.myapp E/AndroidRuntime: FATAL EXCEPTION: main

Process: shiep.dxxy.myapp, PID: 11398

java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView.setText(java.lang.CharSequence)' on a null object reference

at shiep.dxxy.myapp.MainActivity$1.onClick(MainActivity.java:20)

at android.view.View.performClick(View.java:5198)

at android.view.View$PerformClick.run(View.java:21147)

at android.os.Handler.handleCallback(Handler.java:739)

at android.os.Handler.dispatchMessage(Handler.java:95)

at android.os.Looper.loop(Looper.java:148)

at android.app.ActivityThread.main(ActivityThread.java:5417)

at java.lang.reflect.Method.invoke(Native Method)

at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)

at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)