小编Fur*_*LES的帖子

我有一个警告对话框,我将使用TextView获取文本但是当我第二次调用它时,应用程序崩溃并出现错误:

04-15 19:37:48.433: E/AndroidRuntime(907): java.lang.IllegalStateException: 
    The specified child already has a parent. You must call removeView() on 
    the child's parent first.

我的Java源码:

public class MainActivity extends ActionBarActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        final RelativeLayout rLayout = (RelativeLayout) findViewById(R.id.relativeLayout);
        Button btn1 = (Button) findViewById(R.id.button1);
        final AlertDialog.Builder build = new AlertDialog.Builder(MainActivity.this);
        build.setTitle("Ders Ad? Giriniz");
        final EditText dersAdiGir = new  EditText(MainActivity.this);
        build.setView(dersAdiGir);
        final LinearLayout layoutDers = (LinearLayout) findViewById(R.id.layoutDers);

        build.setPositiveButton("Tamam", new DialogInterface.OnClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int which) …