Question

Android开发中的一个简单的问题

package com.example.helloworld;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;
public class MainActivity extends ActionBarActivity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}

public void clickHandler(View source) { //这一行提示错误View cannot be resolved to a type
// 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.
TextView tv=(TextView)findViewById(R.id.show); //提示错误show cannot be resolved or is not a field
tv.setText("Hello Android="+new java.util.Date());

}

}
那两处错误应该怎么改

Answer 1

提示错误View cannot be resolved to a type，你是不是在R.layout.activity_main布局文件button控件加了onclick属性

提示错误show cannot be resolved or is not a field 也是布局文件问题,你贴下布局文件

167424520 懂的进