java - android studio 按钮不起作用

Question

我为我的应用程序创建了一个 android studio 按钮，当我单击注册按钮时它不起作用。我没有收到任何错误，它只是不起作用。当用户单击注册按钮时，我想转到登录 Activity 。

RegisterActivity.java:

import android.app.AlertDialog;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.toolbox.Volley;

import org.json.JSONException;
import org.json.JSONObject;

 public class RegisterActivity extends AppCompatActivity {

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

    final EditText etUsername = (EditText) findViewById(R.id.etUsername);
    final EditText etPassword = (EditText) findViewById(R.id.etPassword);
    final Button bRegister = (Button) findViewById(R.id.bRegister);

    bRegister.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            final String username = etUsername.getText().toString();
            final String password = etPassword.getText().toString();

            Response.Listener<String> responseListener = new Response.Listener<String>() {
                @Override
                public void onResponse(String response) {
                    try {
                        JSONObject jsonResponse = new JSONObject(response);
                        boolean success = jsonResponse.getBoolean("success");
                        if (success) {
                            Intent intent = new Intent(RegisterActivity.this, LoginActivity.class);
                            RegisterActivity.this.startActivity(intent);
                        } else {
                            AlertDialog.Builder builder = new AlertDialog.Builder(RegisterActivity.this);
                            builder.setMessage("Register Failed")
                                    .setNegativeButton("Retry", null)
                                    .create()
                                    .show();
                        }
                    } catch (JSONException e) {
                        e.printStackTrace();
                    }
                }
            };

            RegisterRequest registerRequest = new RegisterRequest( username, password, responseListener);
            RequestQueue queue = Volley.newRequestQueue(RegisterActivity.this);
            queue.add(registerRequest);
        }
    });
}

}

activity_register.xml:

 <Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Register"
    android:id="@+id/bRegister"
    android:layout_below="@+id/etPassword"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true"
    android:layout_marginTop="56dp"
    android:layout_alignRight="@+id/etPassword"
    android:layout_alignEnd="@+id/etPassword"
    android:clickable="true"
    android:onClick="OnClickListener" />

注册请求:

import com.android.volley.Response;
import com.android.volley.toolbox.StringRequest;

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

public class RegisterRequest extends StringRequest {

 private static final String REGISTER_REQUEST_URL = "http://app.comxa.com/register.php";
private Map<String, String> params;

 public RegisterRequest(String username, String password, Response.Listener<String> listener){
    super(Method.POST, REGISTER_REQUEST_URL, listener, null);
    params = new HashMap<>();
    params.put("username", username);
    params.put("password", password);
}

@Override
public Map<String, String> getParams() {
    return params;
}
}

Answer 1

在 xml 中，属性 android:onClick 必须包含方法的名称，而不是监听器名称，例如:

android:onClick="mybutton"

在类里面:

public void mybutton(View v){
    if(v.getId() == R.id.mybutton){
        //handle the click here and make whatever you want
  }
}

另一种方法是使用 onClickListener，如下所示:

在 XML 中:

android:id="@+id/mybutton"

在类里面:

Button mybutton = (Button) findViewById(R.id.mybutton);
mybutton.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        //your code here
    }
});