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我有3個Spinners,我從他們每個人中選擇值。但是,當我在下一個按鈕的onClickListener()之外聲明setOnItemSelected()方法時,選定的值不會顯示在Toast中。當我在按鈕的onClickListener中聲明setOnItemSelected()方法時,它可以工作,但當我從上一個微調器中選擇「Set Limit」時,我無法隱藏編輯文本。 請幫忙。 以下是我的.java文件。Android微調控制器實現不顯示選定的項目
public class AvailabilityActivity extends AppCompatActivity {
private Button next;
private Spinner advanceNotice, shortestTrip, longestDist;
private Bundle bundle;
private EditText setLimit;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_availability);
bundle = getIntent().getExtras();
intializeSpinners();
setLimit = (EditText) findViewById(R.id.setlimit);
ArrayAdapter<CharSequence> adapteradvNotice = ArrayAdapter.createFromResource(this, R.array.advNoticeArray, R.layout.spinner_layout);
adapteradvNotice.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
advanceNotice.setAdapter(adapteradvNotice);
ArrayAdapter<CharSequence> adaptershortestTrip = ArrayAdapter.createFromResource(this, R.array.shortestTripArray, R.layout.spinner_layout);
adaptershortestTrip.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
shortestTrip.setAdapter(adaptershortestTrip);
ArrayAdapter<CharSequence> adapterlongestDist = ArrayAdapter.createFromResource(this, R.array.longestDistanceArray, R.layout.spinner_layout);
adapterlongestDist.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
longestDist.setAdapter(adapterlongestDist);
onNextPressed();
}
private void intializeSpinners() {
advanceNotice = (Spinner) findViewById(R.id.acceptAdvanceNotice);
shortestTrip = (Spinner) findViewById(R.id.acceptShortestTrip);
longestDist = (Spinner) findViewById(R.id.acceptLongestTrip);
}
private void onNextPressed() {
next = (Button) findViewById(R.id.nextButton1);
final String[] setLimitText = {""};
final String[] selectedlongestDist = new String[1];
longestDist.setOnItemSelectedListener(new Spinner.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
selectedlongestDist[0] = parent.getItemAtPosition(position).toString();
if (selectedlongestDist[0].equals("Set Limit")){
setLimit.setVisibility(View.VISIBLE);
setLimitText[0] = setLimit.getText().toString();
}
if (selectedlongestDist[0].equals("No Limit")) {
setLimit.setVisibility(View.INVISIBLE);
}
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
if (setLimitText[0] == "")
setLimitText[0] = selectedlongestDist[0];
next.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
final String[] selectedNotice = new String[1];
advanceNotice.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
selectedNotice[0] = parent.getItemAtPosition(position).toString();
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
final String[] selectedshortestTrip = new String[1];
shortestTrip.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
selectedshortestTrip[0] = parent.getItemAtPosition(position).toString();
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
Toast.makeText(getApplicationContext(), setLimitText[0], Toast.LENGTH_LONG).show();
bundle.putString("advancenotice", selectedNotice[0]);
bundle.putString("shortesttrip", selectedshortestTrip[0]);
bundle.putString("longesttrip", setLimitText[0]);
Intent intent = new Intent(getBaseContext(),ImageActivity.class);
intent.putExtras(bundle);
startActivity(intent);
}
});
}
}
以下是我的佈局文件。
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.csci567.dailyrentals.AvailabilityActivity">
<TextView
android:layout_width="0dp"
android:layout_height="wrap_content"
android:text="How much advance notice do you need to confirm a trip request?"
android:textColor="#000000"
android:textSize="18dp"
android:layout_marginLeft="15dp"
android:id="@+id/advanceNoticeRequestText"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintVertical_bias="0.035"
android:layout_marginStart="15dp" />
<TextView
android:layout_width="0dp"
android:layout_height="wrap_content"
android:text="Advance notice"
android:textSize="14dp"
android:id="@+id/advanceNoticeText"
android:layout_marginLeft="15dp"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintVertical_bias="0.13"
android:layout_marginStart="15dp" />
<Spinner
android:layout_width="0dp"
android:layout_height="wrap_content"
android:id="@+id/acceptAdvanceNotice"
android:hint="Advance Notice"
style="@style/Widget.AppCompat.Spinner.Underlined"
android:layout_marginLeft="15dp"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintVertical_bias="0.18"
android:layout_marginStart="15dp" />
<TextView
android:layout_width="0dp"
android:layout_height="wrap_content"
android:text="Block trips that don't give you enough advance notice."
android:textSize="16dp"
android:id="@+id/blockNoticeText"
android:layout_marginLeft="15dp"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintVertical_bias="0.26"
android:layout_marginStart="15dp" />
<View android:background="#a8a8a6"
android:layout_width = "0dp"
android:layout_height="1dp"
android:id="@+id/separatorLine1"
android:layout_marginTop="25dp"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintVertical_bias="0.3"/>
<TextView
android:layout_width="0dp"
android:layout_height="wrap_content"
android:text="How long would you like trips to last?"
android:textSize="18dp"
android:textColor="#000000"
android:id="@+id/tripDurationText"
android:layout_marginLeft="15dp"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintVertical_bias="0.4"
android:layout_marginStart="15dp" />
<TextView
android:layout_width="0dp"
android:layout_height="wrap_content"
android:text="Shortest possible trip"
android:textSize="14dp"
android:id="@+id/shortestTripText"
android:layout_marginLeft="15dp"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintVertical_bias="0.46"
android:layout_marginStart="15dp" />
<Spinner
android:layout_width="0dp"
android:layout_height="wrap_content"
android:id="@+id/acceptShortestTrip"
android:hint="Enter Shortest Trip"
style="@style/Widget.AppCompat.Spinner.Underlined"
android:layout_marginLeft="15dp"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintVertical_bias="0.52"
android:layout_marginStart="15dp" />
<TextView
android:layout_width="0dp"
android:layout_height="wrap_content"
android:text="Longest Possible trip"
android:textSize="14dp"
android:id="@+id/longestTripText"
android:layout_marginLeft="15dp"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintVertical_bias="0.6"
android:layout_marginStart="15dp" />
<Spinner
android:layout_width="0dp"
android:layout_height="wrap_content"
android:id="@+id/acceptLongestTrip"
android:hint="Enter Longest Trip"
style="@style/Widget.AppCompat.Spinner.Underlined"
android:layout_marginLeft="15dp"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintVertical_bias="0.66"
android:layout_marginStart="15dp" />
<EditText
android:layout_width="0dp"
android:layout_height="wrap_content"
android:id="@+id/setlimit"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintVertical_bias="0.76"
android:hint="Enter the value of longest possible trip"
android:layout_marginStart="15dp"
android:layout_marginLeft="15dp" />
<Button
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginTop="35dp"
android:text="Next"
android:textSize="18dp"
android:textColor="#ffffff"
android:background="#8b36bc"
android:id="@+id/nextButton1"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintVertical_bias="1.0"/>
</android.support.constraint.ConstraintLayout>
好的。將嘗試重新排列它。感謝您的回覆 –
我試着把所有setOnItemSelectListener()放在onClickListener()之外,其他一切正常。但正如你在我的代碼中看到的那樣,我需要把這個值放入這個包中並傳遞給下一個活動。現在我不能把bundle放在setOnItemSelectListener()中,因爲每次用戶選擇一個值時,它都會被輸入到bundle中。而且我無法訪問按鈕的onClickListener()內的選定值。 –
@ParagAgrawal你可以根據你的商業規則做很多事情。您可以將來自'setOnItemSelectListener()'的數據存儲在一個變量中,並在您調用該活動時獲取該數據,並且此時可以將數據傳遞給該包,甚至可以使用該包本身。您可以直接從'setOnItemSelectListener()'中將數據放入包中,並進行檢查以避免重複值。我有一個問題,如果你只使用數組的第一個位置,爲什麼要使用String []? –