类不是抽象的,并且不会覆盖OnClickListener中的抽象方法onClick(View) [英] Class is not abstract and does not override abstract method onClick(View) in OnClickListener
问题描述
我是android开发的新手,正在尝试创建一个应用程序来检查给定的字符串是否为回文.这段代码有什么问题?
I am new to android development and am trying to create an app to check if a given string is Palindrome or not. What is the problem with this code?
我正在使用Android Studio.
I am using Android Studio.
错误是
类不是抽象的,并且不会覆盖抽象方法 OnClickListener中的onClick(View)
Class is not abstract and does not override abstract method onClick(View) in OnClickListener
package com.example.myapplication;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import java.lang.String;
import java.lang.StringBuffer;
public class Alaukik extends AppCompatActivity implements View.OnClickListener
{
private View v;
final TextView textView = (TextView) findViewById(R.id.textView2);
final EditText editText = (EditText) findViewById(R.id.editText);
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_alaukik);
final Button checkbutton = (Button) findViewById(R.id.button);
checkbutton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
String str = editText.getText().toString();
StringBuffer b = new StringBuffer(str);
String reved = b.reverse().toString();
if (reved.equals(str)) {
textView.setText("Palindrome");
} else {
textView.setText("Not a Palindrome");
}
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_alaukik, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
推荐答案
您只需要覆盖onClick(View)
方法,请添加:
You just need to override the onClick(View)
method, add:
@Override
public void onClick(View view) {
}
但是我可以看到由于您正在使用setOnClickListener(new View.OnClickListener());
而未使用此方法,因此您可以删除implements View.OnClickListener
部分而不必覆盖onClick
方法
But I can see you're not using this method anyway since you're using setOnClickListener(new View.OnClickListener());
so you can just remove the implements View.OnClickListener
part without having to override the onClick
method
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