Android：onhtml方法不工作

Question

xml代码：

 <Button
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Invia"
            android:clickable="true"
            android:onClick="onClick1"
            android:id="@+id/invia" />

java代码：

import android.app.Activity;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;

import java.util.HashMap;
import java.util.Locale;
import java.util.Map;

public class CreazioneSondaggio extends AppCompatActivity   {

    String URL;
    private EditText titolo;
    private EditText sceltaA;
    private EditText sceltaB;
    private EditText sceltaC;
   private Button invio;
    private EditText server;
    @Override
    protected void onCreate(Bundle savedInstanceState)  {
        titolo = (EditText) findViewById(R.id.titolo);
        sceltaA = (EditText) findViewById(R.id.A);
        sceltaB = (EditText) findViewById(R.id.B);
        sceltaC = (EditText) findViewById(R.id.C);
        server= (EditText) findViewById(R.id.server);
       invio = (Button) findViewById(R.id.invia);

       // invio.setOnClickListener(this);

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_creazione_sondaggio);
    }

    private void inviodati() {
        ......
    }

    public void onClick1(View v) {
        Toast.makeText(CreazioneSondaggio.this, "ok", Toast.LENGTH_LONG).show();

           inviodati();



    }


}

错误：

进程：com.example.rober.registrazione，PID： 21261java.lang.IllegalStateExcture：无法执行android的方法：在android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.on单击（AppCompatViewInflater.java:275）在android.view.View.perform点击（View.java:5210）在android.view.查看$PerformClick.run（View.java:21288）在android.os.Handler.handle回调（Handler.java:739）在android.os.H<-消息（Handler.java:95）在android.os.Looper.loop（Looper.java:148）在android. app.ActivityThread. main（ActivityThread. java： 5527）在java. lang.反射。方法调用（本机方法）在com. android. interal. os。ZygoteInit$method odAndArgsCaller. run（ZygoteInit. java： 730）在com. android. interal. os。ZygoteInit. main（ZygoteInit. java： 620）引起：java. lang.反射。在java. lang.反射率。在android. support. v7. app中调用（本机方法）。AppCompatViewInflater$DeclaredOnClickListenerer. onClark（AppCompatViewInflater. java： 270）在android. view。查看. perform单击（查看. java： 5210）

我怎样才能修好它？

Answer 1

Xml布局：

 <Button
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
     android:text="Invia"
     android:clickable="true"
     android:id="@+id/invia" />

添加以下代码到您的活动：

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.your_layout);

        titolo = (EditText) findViewById(R.id.titolo);
        sceltaA = (EditText) findViewById(R.id.A);
        sceltaB = (EditText) findViewById(R.id.B);
        sceltaC = (EditText) findViewById(R.id.C);
        server= (EditText) findViewById(R.id.server);
        invio = (Button) findViewById(R.id.invia);

        invio.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(CreazioneSondaggio.this, "ok", Toast.LENGTH_LONG).show();
                // code
            }
        });

    }

Answer 2

像这样做...

super.onCreate(savedInstanceState);
        setContentView(R.layout.your_layout);
    InviaButton = (TextView) findViewById(R.id.invia);

     InviaButton.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
    //your_code
      }
    }

Answer 3

更新oncreate方法

 protected void onCreate(Bundle savedInstanceState)  {
  super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_creazione_sondaggio);
        titolo = (EditText) findViewById(R.id.titolo);
        sceltaA = (EditText) findViewById(R.id.A);
        sceltaB = (EditText) findViewById(R.id.B);
        sceltaC = (EditText) findViewById(R.id.C);
        server= (EditText) findViewById(R.id.server);
       invio = (Button) findViewById(R.id.invia);

       // invio.setOnClickListener(this);


    }