我有一个大问题，请有人帮我。
我有一个带有选项卡和3个片段的ActionBar。
在onCreateView方法中，我有：
MainActivity.java
...
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = null;
TextView textView;
final Intent intent = new Intent(getActivity(),ResultActivity.class);
if(getArguments().getInt(ARG_SECTION_NUMBER) == 1){
rootView = inflater.inflate(R.layout.fragment_main, container, false);
Button btn = (Button) rootView.findViewById(R.id.procura_ingredientes);
final EditText ing_1 = (EditText) rootView.findViewById(R.id.ingredient_1);
final EditText ing_2 = (EditText) rootView.findViewById(R.id.ingredient_2);
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
intent.putExtra(MOD_SEARCH,1);
String ingredient_1 = ing_1.getText().toString();
String ingredient_2 = ing_2.getText().toString();
if(ingredient_1.length() <= 0) ingredient_1 = "";
if(ingredient_2.length() <= 0) ingredient_2 = "";
intent.putExtra("ingredient_1",ingredient_1);
intent.putExtra("ingredient_2",ingredient_2);
startActivity(intent);
}
});
}else if(getArguments().getInt(ARG_SECTION_NUMBER) == 2){
rootView = inflater.inflate(R.layout.fragment_two, container, false);
GridView gridview = (GridView) rootView.findViewById(R.id.gridview);
final ImageAdapter imageAdapter = new ImageAdapter(getActivity());
gridview.setAdapter(imageAdapter);
gridview.setOnItemClickListener(new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
//Toast.makeText(getActivity()," " + position, Toast.LENGTH_SHORT).show();
long cat = imageAdapter.getItemId(position);
if(cat <= 0) cat = 1;
intent.putExtra(MOD_SEARCH,2);
intent.putExtra("cat_id",cat);
startActivity(intent);
}
});
}else if(getArguments().getInt(ARG_SECTION_NUMBER) == 3) {
rootView = inflater.inflate(R.layout.fragment_three, container, false);
final EditText editText = (EditText) rootView.findViewById(R.id.recipe_search_term);
Button button = (Button) rootView.findViewById(R.id.submit_recipe_search);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
int cont = editText.getText().toString().length();
if (cont < 2) {
AlertDialog.Builder dialog = new AlertDialog.Builder(getActivity());
dialog.setTitle("Atenção");
dialog.setMessage("O nome da receita precisa ter mais de " + cont + " letras ");
dialog.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.dismiss();
}
});
dialog.show();
} else {
intent.putExtra(MOD_SEARCH,0);
String recipe = editText.getText().toString();
if(recipe.length() <= 0) recipe = "";
intent.putExtra("recipe_name",recipe);
startActivity(intent);
}
}
});
}
return rootView;
/* textView.setText(Integer.toString(getArguments().getInt(ARG_SECTION_NUMBER)));*/
}
}
如果你看，你会看到
if(getArguments().getInt(ARG_SECTION_NUMBER) == 1){
}else if(getArguments().getInt(ARG_SECTION_NUMBER) == 2){
else
这个管理标签用户所处的位置，都转到相同的ResultActivity，但传递不同的ExtraString，
intent.putExtra(MOD_SEARCH,0);
intent.putExtra(MOD_SEARCH,1);
intent.putExtra(MOD_SEARCH,2);
MOD_SEARCH控件执行什么结果。
ResultActivity.java
public static final String MOD_SEARCH = null;
mode = getIntent().getIntExtra(MOD_SEARCH,0);
if(mode == 0){ ..
}else if(mode == 1) ..
}else if(mode == 2) ..
因此，在模拟器中，它工作正常，当我在每个片段中单击时，它将向我显示正确的信息。
在几天前将应用发布到Google Play后，出现以下错误：
java.lang.NullPointerException
at android.content.Intent.putExtra(Intent.java:5558)
at com.iondev.cozinhaparasolteiros.MainActivity$PlaceholderFragment$2.onItemClick(MainActivity.java:256)
和
java.lang.NullPointerException
at android.content.Intent.putExtra(Intent.java:5325)
at com.iondev.cozinhaparasolteiros.MainActivity$PlaceholderFragment$1.onClick(MainActivity.java:226)
我不明白，因为在模拟器中它可以正常工作且设备有错误，我不知道出了什么问题，请有人提出建议，因为需要存储，因此需要维修。
最佳答案
取代这个
public static final String MOD_SEARCH = null;
为了这
public static String MOD_SEARCH = "";
我认为您的问题出在“ final”一词上，因为将变量“ null”初始化为“ final”将无法在以后更改其值，因此将其分配给Intent为Null。
希望您能为您服务。
对不起，我的英语水平不高。