我有一个活动A，我从中开始一个活动结果B.在活动中，有一个包含回收者视图的片段。当活动B启动时，它使用相同的回收器视图适配器并单击正在使用的监听器活动A中包含的片段。问题是活动B似乎没有被破坏，这导致点击监听器出现问题并导致应用程序崩溃。我想知道为什么没有调用onPause或onDestroy活动b 。 我编辑了可能不重要的代码。
活动B
*当我注释掉这行
时public class Add_Custom extends AppCompatActivity implements RecyclerViewAdapter.ClickListener, com.wdullaer.materialdatetimepicker.date.DatePickerDialog.OnDateSetListener {
private static final int PICK_IMAGE_REQUEST = 1;
private FloatingActionButton floatingActionButton;
ArrayList<Person> persons = new ArrayList<>();
private RecyclerViewAdapter rcv;
private ArrayList<Person> personRecyclerList = new ArrayList<>();
private LocalDate date;
private String name;
private Snackbar snackbar;
private boolean date_flag = false;
private boolean user_flag = false;
private CollapsingToolbarLayout collapsingToolbarLayout;
private ImageView imageView;
private String picturePath;
private int image_color;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_add_custom);
android.os.Handler handler = new android.os.Handler();
Runnable runnable = new Runnable() {
@Override
public void run() {
getName();
}
};
handler.post(runnable);
setUpRecyclerView();
imageView = (ImageView) findViewById(R.id.image_toolbar);
collapsingToolbarLayout = (CollapsingToolbarLayout) findViewById(R.id.collapseToolbar);
floatingActionButton = (FloatingActionButton) findViewById(R.id.fab);
final Toolbar toolbar = (Toolbar) findViewById(R.id.app_bar);
floatingActionButton.setEnabled(false);
setSupportActionBar(toolbar);
final ActionBar actionBar = getSupportActionBar();
if (actionBar != null) {
actionBar.setDisplayShowTitleEnabled(true);
actionBar.setTitle("Custom Event");
actionBar.setDisplayHomeAsUpEnabled(true);
}
final String[] stringArray = genList(getApplicationContext());
floatingActionButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
new MaterialDialog.Builder(Add_Custom.this)
.title("Select Contact")
.autoDismiss(true)
.items(stringArray)
.widgetColor(image_color != 0 ? image_color : ContextCompat.getColor(Add_Custom.this, R.color.accentColor))
.itemsCallbackMultiChoice(null, new MaterialDialog.ListCallbackMultiChoice() {
@Override
public boolean onSelection(MaterialDialog materialDialog, Integer[] integers, CharSequence[] charSequences) {
for (int i = 0; i < integers.length; i++) {
if (!personRecyclerList.contains(persons.get(integers[i]))) {
personRecyclerList.add(persons.get(integers[i]));
rcv.notifyItemInserted(personRecyclerList.size());
}
}
return true;
}
})
.negativeColor(image_color != 0 ? image_color : ContextCompat.getColor(Add_Custom.this, R.color.accentColor))
.negativeText("Cancel")
.positiveColor(image_color != 0 ? image_color : ContextCompat.getColor(Add_Custom.this, R.color.accentColor))
.positiveText("Add")
.show();
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_add__custom, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.done) {
checkConstraints();
}
return super.onOptionsItemSelected(item);
}
public String[] genList(final Context context) {
final DataBaseHelper db = new DataBaseHelper(context);
final ArrayList<String> arrayList = new ArrayList<>();
Runnable runnable = new Runnable() {
@Override
public void run() {
persons = db.getPeople();
for (int i = 0; i < persons.size(); i++)
arrayList.add(persons.get(i).getName());
}
};
runnable.run();
floatingActionButton.setEnabled(true);
return arrayList.toArray(new String[arrayList.size()]);
}
public void setUpRecyclerView() {
final RecyclerView recyclerView = (RecyclerView) findViewById(R.id.rv);
rcv = new RecyclerViewAdapter(getApplicationContext());
rcv.setClickListener(this);
final LinearLayoutManager llm = new LinearLayoutManager(getApplicationContext());
rcv.setArrayList(personRecyclerList);
llm.setOrientation(LinearLayoutManager.VERTICAL);
recyclerView.setLayoutManager(llm);
recyclerView.setHasFixedSize(true);
recyclerView.setItemAnimator(new DefaultItemAnimator());
recyclerView.setAdapter(rcv);
}
@Override
public void itemClick(View v, final int position) {
final MaterialDialog materialDialog = new MaterialDialog.Builder(Add_Custom.this)
.title("Remove Person")
.positiveColor(image_color != 0 ? image_color : ContextCompat.getColor(Add_Custom.this, R.color.accentColor))
.positiveText("Remove")
.negativeColor(image_color != 0 ? image_color : ContextCompat.getColor(Add_Custom.this, R.color.accentColor))
.negativeText("Cancel")
.show();
View positive = materialDialog.getActionButton(DialogAction.POSITIVE);
View negative = materialDialog.getActionButton(DialogAction.NEGATIVE);
positive.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
personRecyclerList.remove(position);
rcv.notifyItemRemoved(position);
if (materialDialog.isShowing())
materialDialog.dismiss();
}
});
negative.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (materialDialog.isShowing())
materialDialog.dismiss();
}
});
}
void checkConstraints() {
if (personRecyclerList.size() > 0) {
if (date_flag && user_flag) {
DataBaseHelper db = new DataBaseHelper(getApplicationContext());
Custom custom = new Custom(date, name);
custom.setPersons(personRecyclerList);
custom.setImage_path(picturePath);
custom.setImage_color(image_color);
long result = db.AddEvent(custom, DataBaseHelper.TYPE_CUSTOM);
Intent intent = new Intent();
if (result >= 0)
setResult(RESULT_OK, intent);
else
setResult(RESULT_CANCELED, intent);
finish();
} else {
snackbar = Snackbar.make(findViewById(R.id.cor_layout), "Incomplete Details", Snackbar.LENGTH_LONG);
snackbar.setAction("Dismiss", clickListener);
snackbar.show();
}
} else {
snackbar = Snackbar.make(findViewById(R.id.cor_layout), "Select A Person", Snackbar.LENGTH_LONG);
snackbar.setAction("Dismiss", clickListener);
snackbar.show();
}
}
private final View.OnClickListener clickListener = new View.OnClickListener() {
public void onClick(View v) {
snackbar.dismiss();
}
};
public void getName() {
final MaterialDialog dialog = new MaterialDialog.Builder(Add_Custom.this)
.title("Name")
.alwaysCallInputCallback()
.inputType(InputType.TYPE_CLASS_TEXT)
.cancelable(false)
.negativeText("Cancel")
.positiveText("Set")
.input("Event Name", null, false, new MaterialDialog.InputCallback() {
@Override
public void onInput(MaterialDialog dialog, CharSequence input) {
name = String.valueOf(input);
}
}).show();
View positive = dialog.getActionButton(DialogAction.POSITIVE);
View negative = dialog.getActionButton(DialogAction.NEGATIVE);
negative.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (dialog.isShowing())
dialog.dismiss();
Intent intent = new Intent();
setResult(RESULT_CANCELED, intent);
finish();
}
});
positive.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
user_flag = true;
if (name != null)
collapsingToolbarLayout.setTitle(name);
if (dialog.isShowing())
dialog.dismiss();
}
});
}
@Override
public void onDateSet(com.wdullaer.materialdatetimepicker.date.DatePickerDialog datePickerDialog, int year, int monthOfYear, int dayOfMonth) {
try {
date = new LocalDate(year, monthOfYear + 1, dayOfMonth);
date_flag = true;
} catch (Exception e) {
date_flag = false;
}
}
@Override
protected void onPause() {
super.onPause();
Log.i("pause", "");
}
@Override
protected void onStop() {
super.onStop();
Log.i("destroyed", "");
}
}
应用程序不再崩溃，一切正常。
rcv.setClickListener(this);
Recycler View Adapter
10-04 09:08:02.683 7508-7508/atsystems.cal D/AndroidRuntime: Shutting down VM
10-04 09:08:02.684 7508-7508/atsystems.cal E/AndroidRuntime: FATAL EXCEPTION: main
10-04 09:08:02.684 7508-7508/atsystems.cal E/AndroidRuntime: Process: atsystems.cal, PID: 7508
10-04 09:08:02.684 7508-7508/atsystems.cal E/AndroidRuntime: com.afollestad.materialdialogs.MaterialDialog$DialogException: Bad window token, you cannot show a dialog before an Activity is created or after it's hidden.
10-04 09:08:02.684 7508-7508/atsystems.cal E/AndroidRuntime: at com.afollestad.materialdialogs.MaterialDialog.show(MaterialDialog.java:1253)
10-04 09:08:02.684 7508-7508/atsystems.cal E/AndroidRuntime: at com.afollestad.materialdialogs.MaterialDialog$Builder.show(MaterialDialog.java:1242)
10-04 09:08:02.684 7508-7508/atsystems.cal E/AndroidRuntime: at atsystems.cal.Add_Custom.itemClick(Add_Custom.java:273)
10-04 09:08:02.684 7508-7508/atsystems.cal E/AndroidRuntime: at atsystems.cal.RecyclerViewAdapters.RecyclerViewAdapter$ViewHolderCheese.onClick(RecyclerViewAdapter.java:94)
10-04 09:08:02.684 7508-7508/atsystems.cal E/AndroidRuntime: at android.view.View.performClick(View.java:4780)
10-04 09:08:02.684 7508-7508/atsystems.cal E/AndroidRuntime: at android.view.View$PerformClick.run(View.java:19866)
10-04 09:08:02.684 7508-7508/atsystems.cal E/AndroidRuntime: at android.os.Handler.handleCallback(Handler.java:739)
10-04 09:08:02.684 7508-7508/atsystems.cal E/AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:95)
10-04 09:08:02.684 7508-7508/atsystems.cal E/AndroidRuntime: at android.os.Looper.loop(Looper.java:135)
10-04 09:08:02.684 7508-7508/atsystems.cal E/AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:5254)
10-04 09:08:02.684 7508-7508/atsystems.cal E/AndroidRuntime: at java.lang.reflect.Method.invoke(Native Method)
10-04 09:08:02.684 7508-7508/atsystems.cal E/AndroidRuntime: at java.lang.reflect.Method.invoke(Method.java:372)
10-04 09:08:02.684 7508-7508/atsystems.cal E/AndroidRuntime: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
10-04 09:08:02.684 7508-7508/atsystems.cal E/AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)