我想用变量概念和proceDo填充此活动中的数组但是当我编译它时会抛出此异常，我不知道为什么到底是因为我在if上初始化数组
public class ConceptsActivity extends AppCompatActivity{
private int i;
private AutoCompleteTextView actv;
private TextView tvConcept;
private TextView tvConcept2;
private TextView warning;
private TextView tvPrice;
private EditText price;
private Button addConcept;
private String concept;
private double priceDo;
private List<AddConceptsListView> myConcept = new ArrayList<AddConceptsListView>();
private Service service[];
public ConceptsActivity(){
}
public ConceptsActivity(Service service[]){
this.service = service;
}
@Override
protected void onCreate(Bundle savedInstanceState) {
setTitle(R.string.TitleSer);
super.onCreate(savedInstanceState);
setContentView(R.layout.concepts_layout);
actv = (AutoCompleteTextView) findViewById(R.id.autoCompleteTextViewConcept);
tvConcept = (TextView) findViewById(R.id.textViewConcept);
tvConcept2 = (TextView) findViewById(R.id.textViewConcept2);
warning = (TextView) findViewById(R.id.textViewWarning);
tvPrice = (TextView) findViewById(R.id.textViewPrice);
price = (EditText) findViewById(R.id.editTextPrice);
addConcept = (Button) findViewById(R.id.buttonAddConcept);
//Autocomplete Textview
String[] services = getResources().getStringArray(R.array.services_array);
ArrayAdapter<String> adapter =
new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, services);
actv.setAdapter(adapter);
actv.setOnEditorActionListener(new TextView.OnEditorActionListener() {
@Override
public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
boolean handled = false;
if (actionId == EditorInfo.IME_ACTION_DONE) {
//make items visible
tvConcept.setVisibility(View.VISIBLE);
tvConcept2.setVisibility(View.VISIBLE);
tvPrice.setVisibility(View.VISIBLE);
price.setVisibility(View.VISIBLE);
addConcept.setVisibility(View.VISIBLE);
concept = actv.getText()+"";
tvConcept2.setText(concept);
//To hide the keyboard
InputMethodManager imm = (InputMethodManager) v.getContext().getSystemService(Context.INPUT_METHOD_SERVICE);
imm.hideSoftInputFromWindow(v.getWindowToken(), 0);
handled = true;
}
return handled;
}
});
}
public void onClickAddConcept(View view){
if(service == null){
service = new Service[1];
i=0;
}
//service = new Service [i];
if(price.getText().toString().equals("")){
warning.setVisibility(View.VISIBLE);
}
else {
warning.setVisibility(View.INVISIBLE);
if(price.getText().toString().contains(".")){
priceDo = Double.parseDouble(price.getText().toString());
Toast.makeText(getApplicationContext(),"Precio: " + priceDo+ "" + "\n"
+ "Concepto: " + concept,Toast.LENGTH_SHORT).show();
service[i].setName(concept);
Toast.makeText(getApplicationContext(), "Array nameConcept: " + service[i].getName(), Toast.LENGTH_SHORT);
}
else{
priceDo = Double.parseDouble(price.getText().toString());
Toast.makeText(getApplicationContext(),"Precio: " + priceDo+ "" + "\n"
+ "Concepto: " + concept,Toast.LENGTH_SHORT).show();
}
}
}
}
这是例外
Process: com.example.ally.helper, PID: 31717
java.lang.IllegalStateException: Could not execute method for android:onClick
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:275)
at android.view.View.performClick(View.java:4761)
at android.view.View$PerformClick.run(View.java:19767)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5312)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:901)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:696)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:270)
at android.view.View.performClick(View.java:4761)
at android.view.View$PerformClick.run(View.java:19767)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5312)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:901)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:696)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.example.ally.helper.Service.setName(java.lang.String)' on a null object reference
at com.example.ally.helper.ConceptsActivity.onClickAddConcept(ConceptsActivity.java:107)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:270)
at android.view.View.performClick(View.java:4761)
at android.view.View$PerformClick.run(View.java:19767)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5312)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:901)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:696)
例外是在这一行
服务[I] .setName（概念）;
答案 0 :(得分：0)
致电时
service = new Service[1];
您实际上并未实例化Service对象，而只是实例化Service数组。
要解决此问题，请尝试：
service = new Service[1];
service[0] = new Service(); // or iterate through a loop and create