Java 类不是抽象的，不会覆盖 OnClickListener 中的抽象方法 onClick(View)
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Class is not abstract and does not override abstract method onClick(View) in OnClickListener
提问by Lincity
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是回文。这段代码有什么问题？
I am using Android Studio.
我正在使用 Android Studio。
The error is
错误是
Class is not abstract and does not override abstract method onClick(View) in OnClickListener
类不是抽象的，不会覆盖 OnClickListener 中的抽象方法 onClick(View)
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);
}
}
采纳答案by Abdallah Alaraby
You just need to override the onClick(View)method, add:
您只需要覆盖该onClick(View)方法，添加：
@Override
public void onClick(View view) {
}
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.OnClickListenerpart without having to override the onClickmethod
但是我可以看到您没有使用此方法，因为您正在使用，setOnClickListener(new View.OnClickListener());因此您可以删除implements View.OnClickListener零件而无需覆盖该onClick方法
回答by Ajeet Kumar Achal
mybutton.setOnClickListener(
new Button.OnClickListener () {
@Override // to override the method
public void onClick(View view) {
TextView mytext = (TextView) findViewById(R.id.mytext);
mytext.setText("clicked now");
}
}
);
回答by live-love
If you don't want to make the class abstract, you have to remove the abstract methods that it contains:
如果不想使类抽象，则必须删除它包含的抽象方法：
public class MyActivity extends AppCompatActivity {
protected abstract int myMethod(); --> remove this line
