0
誰能告訴我爲什麼我在下面的代碼中得到錯誤信息java.lang.NullPointerException
?更改onCreate函數中的textView文本
package firstApp.hangman;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.widget.TextView;
public class HangmenActivity extends Activity
{
private String word_to_guess;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
this.set_random_word();
TextView wordToGuess = (TextView) findViewById(R.id.word_to_guess);
try
{
wordToGuess.setText(this.word_to_guess);
}
catch(Exception e)
{
AlertDialog alertDialog = new AlertDialog.Builder(this).create();
alertDialog.setTitle("error");
alertDialog.setMessage(e.toString());
alertDialog.setButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// here you can add functions
}
});
alertDialog.setIcon(R.drawable.icon);
alertDialog.show();
}
setContentView(R.layout.main);
}
private void set_random_word()
{
this.word_to_guess = "abcdef";
}
}