Android Socket求解

Question

package com.example.administrator.myapplication;import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;import java.io.DataOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.Socket;public class MainActivity extends AppCompatActivity {    private EditText e1;
    private Button b1;
    private Socket s = null;
    private OutputStream out;
    private String values;    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
        thread.start();
    }
    public void initView(){
        e1 = findViewById(R.id.edit);
        b1 = findViewById(R.id.btn);
        b1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                values = e1.getText().toString();
                try {
                    out.write(values.getBytes());
                } catch (IOException e) {
                    e.printStackTrace();
                }finally {
                    e1.setText("");
                }
            }
        });
    }
    Thread thread = new Thread(new Runnable() {
        @Override
        public void run() {
            if(s == null){
                try {
                    s = new Socket("172.18.11.103", 8000);
                    out = s.getOutputStream();
                }catch (Exception e){
                    e.printStackTrace();
                }
            }
        }
    });
}需求:从EditText获取字符，通过Socket发送。
网络权限也加了，单击就崩溃，哪里有问题吗？

Answer 1

09-03 20:35:51.745 5876-5876/com.example.administrator.myapplication2 E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.administrator.myapplication2, PID: 5876
    java.lang.NullPointerException: Attempt to invoke virtual method 'void java.io.OutputStream.write(byte[])' on a null object reference
        at com.example.administrator.myapplication2.MainActivity$1.onClick(MainActivity.java:36)
        at android.view.View.performClick(View.java:4780)
        at android.view.View$PerformClick.run(View.java:19866)
        at android.os.Handler.handleCallback(Handler.java:739)
        at android.os.Handler.dispatchMessage(Handler.java:95)
        at android.os.Looper.loop(Looper.java:135)
        at android.app.ActivityThread.main(ActivityThread.java:5254)
        at java.lang.reflect.Method.invoke(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:372)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
09-03 20:35:51.854 406-2173/system_process E/[EGL-ERROR]: EGLBoolean __egl_platform_create_surface_window(egl_surface*, mali_base_ctx_handle):933: =========> usage 0x900
09-03 20:35:51.872 406-2173/system_process E/[EGL-ERROR]: EGLBoolean __egl_platform_create_surface_window(egl_surface*, mali_base_ctx_handle):933: =========> usage 0x900

Answer 2

thread 没有启动  OutputSream 是空指针
还有  不用开启线程创建socket连接
write 内容的时候 可以考虑用线程死循环读取

Answer 3

  e1 控件没有数据，
 out.write(values.getBytes());空引用因为values是空值，点击按钮前先在EditText e1 里填写点数据;