在Mainactivity.java错误 [英] Errors in Mainactivity.java
问题描述
我有以下的code,我无法找到一种方法来摆脱这些错误的:
在类型视图的方法setOnClickListener(View.OnClickListener)不适用于参数(MainActivity)
块引用>这适用于线17,18,19,20,21,22,23,24,含25:
findViewById(R.id.imageButton9).setOnClickListener(本);
在第31行(在其中创建新类线),我得到:
嵌套类型MainActivity无法隐藏封闭类型
块引用>这是code我的工作:
包com.example.rome;进口android.os.Bundle;
进口android.app.Activity;
进口android.view.Menu;
进口android.widget.EditText;
进口android.widget.Button;
进口android.view.View;
进口android.widget.Toast;公共类MainActivity延伸活动{@覆盖
保护无效的onCreate(捆绑savedInstanceState){
super.onCreate(savedInstanceState);
的setContentView(R.layout.activity_main);
findViewById(R.id.imageButton1).setOnClickListener(本);
findViewById(R.id.imageButton2).setOnClickListener(本);
findViewById(R.id.imageButton3).setOnClickListener(本);
findViewById(R.id.imageButton4).setOnClickListener(本);
findViewById(R.id.imageButton5).setOnClickListener(本);
findViewById(R.id.imageButton6).setOnClickListener(本);
findViewById(R.id.imageButton7).setOnClickListener(本);
findViewById(R.id.imageButton8).setOnClickListener(本);
findViewById(R.id.imageButton9).setOnClickListener(本);}类MainActivity扩展活动实现View.OnClickListener { @覆盖
公共无效的onClick(视图v){
开关(v.getId()){
案例R.id.R.id.imagebutton1:
startActivity(新意图(telefoonnummers.class));
打破;
案例R.id.R.id.imagebutton2:
startActivity(新意图(telefoonnummers.class));
打破;
// - 更多的情况下 -
案例R.id.R.id.imagebutton9:
startActivity(新意图(telefoonnummers.class));
打破;
}
}
}@覆盖
公共布尔onCreateOptionsMenu(菜单菜单){
//充气菜单;如果是present这增加了项目操作栏。
。getMenuInflater()膨胀(R.menu.activity_main,菜单);
返回true;
}}
解决方案删除错误的类定义:
类MainActivity扩展活动实现View.OnClickListener {
和增加
实现View.OnClickListener
来真正的类定义:公共类MainActivity扩展活动实现View.OnClickListener {
//这个添加到真正的MainActivity ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^花点时间,以确保您正确每逢括号(
{}
)。I have the following code and I can't find a way to get rid of these errors:
The method setOnClickListener(View.OnClickListener) in the type View is not applicable for the arguments (MainActivity)
This applies to the lines 17, 18, 19, 20, 21, 22, 23, 24, 25 containing:
findViewById(R.id.imageButton9).setOnClickListener(this);
In line 31 (the line where the new class is created), I get:
The nested type MainActivity cannot hide an enclosing type
This is the code I'm working with:
package com.example.rome; import android.os.Bundle; import android.app.Activity; import android.view.Menu; import android.widget.EditText; import android.widget.Button; import android.view.View; import android.widget.Toast; public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); findViewById(R.id.imageButton1).setOnClickListener(this); findViewById(R.id.imageButton2).setOnClickListener(this); findViewById(R.id.imageButton3).setOnClickListener(this); findViewById(R.id.imageButton4).setOnClickListener(this); findViewById(R.id.imageButton5).setOnClickListener(this); findViewById(R.id.imageButton6).setOnClickListener(this); findViewById(R.id.imageButton7).setOnClickListener(this); findViewById(R.id.imageButton8).setOnClickListener(this); findViewById(R.id.imageButton9).setOnClickListener(this); } class MainActivity extends Activity implements View.OnClickListener { @Override public void onClick(View v){ switch(v.getId()){ case R.id.R.id.imagebutton1: startActivity(new Intent(telefoonnummers.class)); break; case R.id.R.id.imagebutton2: startActivity(new Intent(telefoonnummers.class)); break; //-- more cases -- case R.id.R.id.imagebutton9: startActivity(new Intent(telefoonnummers.class)); break; } } } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.activity_main, menu); return true; } }
解决方案Remove the errant class definition:
class MainActivity extends Activity implements View.OnClickListener {
And add
implements View.OnClickListener
to the real class definition:public class MainActivity extends Activity implements View.OnClickListener { // Add this to the "real" MainActivity ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Take a moment to make sure you have properly closed every brace (
{}
).这篇关于在Mainactivity.java错误的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!