我有以下代码：
package com.androidtest.notification; import android.app.Activity; import android.os.Bundle; import android.widget; import android.widget.Toast; import android.content.Context; public class activityNotification extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); Context context = getApplicationContext(); CharSequence text = "Hello toast!"; int duration = Toast.LENGTH_SHORT; Toast toast = Toast.makeText(context, text, duration); toast.show(); } } 我试图在命令行'$ ant build'上使用ant进行编译，但是我不断收到以下错误：
error: cannot find symbol [javac] Context context = getApplicationContext(); [javac] ^
有什么build议吗？ 谢谢！
活动中的上下文通过YourActivity.this获得，或者更容易
package com.androidtest.notification; import android.app.Activity; import android.os.Bundle; import android.widget; import android.widget.Toast; import android.content.Context; public class ActivityNotification extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); Context context = this; // or ActivityNotification.this CharSequence text = "Hello toast!"; int duration = Toast.LENGTH_SHORT; Toast toast = Toast.makeText(this, text, duration); toast.show(); } }