E/AndroidRuntime: FATAL EXCEPTION: OkHttp Dispatcher
Process: com.example.androidcamera, PID: 13877
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView.setText(java.lang.CharSequence)' on a null object reference
at com.example.androidcamera.MainActivity$2$1.onResponse(MainActivity.java:159)
at okhttp3.RealCall$AsyncCall.execute(RealCall.java:141)
at okhttp3.internal.NamedRunnable.run(NamedRunnable.java:32)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
at java.lang.Thread.run(Thread.java:923)
I/Process: Sending signal. PID: 13877 SIG: 9
空指针异常，调用void android.widget.TextView.setText方法报错，对象不存在，检查一下是不是没有初始化
at com.example.androidcamera.MainActivity$2$1.onResponse(MainActivity.java:159)
你是把response. body. string复制给TextView吧，
TextView为空对象，你是不是没有findViewById初始化