Im新的Android Studio和Android开发。所以我按照developer.android.com给出的教程，我在这一行中有一个错误：EditText editText = (EditText) findViewById(R.id.editText); 错误是说：找不到符号变量editText。Android Studio：R.id.editText中的错误

这是我的整个代码：import android.os.Bundle;

import android.support.v7.app.AppCompatActivity;

import android.view.View;

import android.view.Menu;

import android.view.MenuItem;

import android.widget.EditText;

import android.content.Intent;

public class MainActivity extends AppCompatActivity {

public static final String EXTRA_MESSAGE = "com.example.lunatello.bdsapp.MESSAGE";

@Override

protected 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.menu_main, 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);

}

public void sendMessage(View view){

Intent intent = new Intent(this, DisplayMessageActivity.class);

EditText editText = (EditText) findViewById(R.id.editText);

String message = editText.getText().toString();

intent.putExtra(EXTRA_MESSAGE, message);

startActivity(intent);

}

}

2017-07-28

luna.t

+0

'editText'不是一部分'activity_main' –

+1

请复制完整的编译器错误消息问题 –

+1

添加你的xml文件 –