java - Android 字符串为空

Question

我的代码有问题

if ((equip != null) && equip.trim().equals("")){
    final Dialog dialog = new Dialog(getActivity());
    dialog.getWindow().requestFeature(Window.FEATURE_NO_TITLE);
    dialog.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN);
    dialog.setContentView(R.layout.dialog_layout_equip);

我的其他是

final Dialog dialog = new Dialog(getActivity());
dialog.getWindow().requestFeature(Window.FEATURE_NO_TITLE);
dialog.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN);
dialog.setContentView(R.layout.dialog_layout);

因此，如果我的字符串为空或为空，我将使用此对话框dialog.setContentView(R.layout.dialog_layout);否则我用这个dialog.setContentView(R.layout.dialog_layout_equip);

我的 logcat 为我提供了此代码的输出

String equip = reserveComp.getString(TAG_EQUIP);
                        Log.d("Equip", equip);

D/Equip:投影仪，所以它打开

dialog.setContentView(R.layout.dialog_layout);

但是当我有这个输出时D/Equip:null打开一样

那怎么了？

更新

这是我的完整 block 代码

JSONObject reserveComp = reqFeitasDetail.getJSONObject(0);
                        String equip = reserveComp.getString(TAG_EQUIP);
                        Log.d("Equip", equip);
                        if ((equip == null) || equip.trim().equals("")){
                            final Dialog dialog = new Dialog(getActivity());
                            dialog.getWindow().requestFeature(Window.FEATURE_NO_TITLE);
                            dialog.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN);
                            dialog.setContentView(R.layout.dialog_layout);
                            dialog.getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
                            dialog.show();
                            Button img = (Button) dialog.findViewById(R.id.close_button);
                            TextView data = (TextView) dialog.findViewById(R.id.data);
                            TextView sala = (TextView) dialog.findViewById(R.id.sala);
                            TextView hora = (TextView) dialog.findViewById(R.id.hora_inicial);
                            TextView fim = (TextView) dialog.findViewById(R.id.hora_final);
                            data.setText(reserveComp.getString(TAG_DATA));
                            sala.setText(reserveComp.getString(TAG_NOME));
                            hora.setText(reserveComp.getString(TAG_TEMPO));
                            fim.setText(reserveComp.getString(TAG_TEMPOFIM));
                            img.setOnClickListener(new View.OnClickListener() {
                                @Override
                                public void onClick(View v) {
                                    dialog.dismiss();
                                }
                            });
                        } else {
                            final Dialog dialog = new Dialog(getActivity());
                            dialog.getWindow().requestFeature(Window.FEATURE_NO_TITLE);
                            dialog.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN);
                            dialog.setContentView(R.layout.dialog_layout_equip);
                            dialog.getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
                            dialog.show();
                            Button img = (Button) dialog.findViewById(R.id.close_button);
                            TextView data = (TextView) dialog.findViewById(R.id.data);
                            TextView sala = (TextView) dialog.findViewById(R.id.sala);
                            TextView equipamento = (TextView) dialog.findViewById(R.id.equip);
                            TextView hora = (TextView) dialog.findViewById(R.id.hora_inicial);
                            TextView fim = (TextView) dialog.findViewById(R.id.hora_final);
                            data.setText(reserveComp.getString(TAG_DATA));
                            sala.setText(reserveComp.getString(TAG_NOME));
                            equipamento.setText(reserveComp.getString(TAG_EQUIP));
                            hora.setText(reserveComp.getString(TAG_TEMPO));
                            fim.setText(reserveComp.getString(TAG_TEMPOFIM));
                            img.setOnClickListener(new View.OnClickListener() {
                                @Override
                                public void onClick(View v) {
                                    dialog.dismiss();
                                }
                            });
                        }

我有这个 logcat 输出

D/Reserva Sala completa﹕ {"tag":"reqEquipFull","success":1,"error":0,"reqEquipFull":[{"data":"2015-06-12","sala":"21","inicio":"14:05:00","fim":"15:45:00","nome":null}]}

D/装备: null

我的对话框仍然有同样的问题，所有(空和非空)打开此对话框

dialog.setContentView(R.layout.dialog_layout_equip);

Answer 1

要检查字符串是否为空或为空，if block 内的条件应为

if ((equip == null) || equip.trim().equals("")){...}

如果您想执行以下操作，还应该切换 if-else 语句中的代码块..

So if my string is null or empty i use this dialog dialog.setContentView(R.layout.dialog_layout); Otherwise i use this one dialog.setContentView(R.layout.dialog_layout_equip);

if ((equip == null) || equip.trim().equals("")){
    final Dialog dialog = new Dialog(getActivity());
    dialog.getWindow().requestFeature(Window.FEATURE_NO_TITLE);
    dialog.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN);
    dialog.setContentView(R.layout.dialog_layout);
}
else {
    final Dialog dialog = new Dialog(getActivity());
    dialog.getWindow().requestFeature(Window.FEATURE_NO_TITLE);
    dialog.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN);
    dialog.setContentView(R.layout.dialog_layout_equip);
}