我无法从扩展AppCompatActivity并在扩展片段类的Activity中接收它的Activity发送数据。问题是我不能在接收类中扩展AppCompatActivity，因为我正在使用包含动画图表的java库，并且需要扩展该片段类，以便活动识别某些方法....我使用了调试器并且似乎数据已成功添加到捆绑包中，但捆绑包在接收端返回null。 （以下代码）
发送活动：
public class CreateLine extends AppCompatActivity {
DatabaseHelper myDb;
Button dateButton, nextButton;
TextView quantity, duration;
Date date = new Date();
String PackageType20 = "648 Shippers";
String PackageType30 = "605 Shippers";
int timeadded;
private Spinner spinner, spinner2;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.create_line);
myDb = new DatabaseHelper(this);
quantity = (TextView) findViewById(R.id.editText3);
duration = (TextView) findViewById(R.id.durationtextView);
dateButton = (Button) findViewById(R.id.angry_btn);
nextButton = (Button) findViewById(R.id.Confirm_button);
spinner = (Spinner) findViewById(R.id.spinner);
ArrayAdapter<String> myAdapter = new ArrayAdapter<String>(com.almac.tracker.CreateLine.this,
R.layout.spinner_layout, getResources().getStringArray(R.array.LineTypes));
myAdapter.setDropDownViewResource(R.layout.spinner_layout);
spinner.setAdapter(myAdapter);
spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> adapterView, View view, int position2, long l) {
switch ((int) position2) {
case 0:
quantity.setText("");
;
break;
case 1:
quantity.setVisibility(View.INVISIBLE);
timeadded = 10;
duration.setText(timeadded + " Hours");
spinner2.setVisibility(View.INVISIBLE);
break;
case 2:
quantity.setVisibility(View.INVISIBLE);
timeadded = 10;
duration.setText(timeadded + " Hours");
spinner2.setVisibility(View.INVISIBLE);
break;
case 3:
quantity.setVisibility(View.INVISIBLE);
timeadded = 10;
duration.setText(timeadded + " Hours");
spinner2.setVisibility(View.INVISIBLE);
break;
case 4:
quantity.setVisibility(View.VISIBLE);
duration.setText(timeadded + " Hours");
spinner2.setVisibility(View.VISIBLE);
Toast.makeText(getApplicationContext(), "Select Package Type", Toast.LENGTH_SHORT).show();
break;
case 5:
quantity.setVisibility(View.VISIBLE);
duration.setText(timeadded + " Hours");
spinner2.setVisibility(View.VISIBLE);
break;
case 6:
quantity.setVisibility(View.VISIBLE);
duration.setText(timeadded + " Hours");
spinner2.setVisibility(View.VISIBLE);
break;
default:
break;
}
}
@Override
public void onNothingSelected(AdapterView<?> adapterView) {
}
});
spinner2 = (Spinner) findViewById(R.id.spinner2);
ArrayAdapter<String> myAdapter2 = new ArrayAdapter<String>(com.almac.tracker.CreateLine.this,
R.layout.spinner_layout, getResources().getStringArray(R.array.PackageTypes));
myAdapter2.setDropDownViewResource(R.layout.spinner_layout);
spinner2.setAdapter(myAdapter2);
spinner2.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> adapterView, View view, int position, long l) {
switch (position) {
case 0:
quantity.setText("");
;
break;
case 1:
quantity.setText(PackageType20);
timeadded = 28;
duration.setText(timeadded + " Hours");
break;
case 2:
quantity.setText(PackageType30);
timeadded = 27;
duration.setText(timeadded + " Hours");
break;
default:
break;
}
}
@Override
public void onNothingSelected(AdapterView<?> adapterView) {
}
});
dateButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
dateButton.setText(date.toString());
// Creates an instance of current DateTime which represents the
// current date time.
DateTime dateTime = new DateTime();
DateTimeFormatter fmt = DateTimeFormat.forPattern("E d MMM yyyy" + "\n" + " h:mm a ");
String formattedtime = fmt.print(dateTime);
dateButton.setText(formattedtime);
// Plus some hours, minutes, and seconds to the original DateTime.
DateTimeFormatter fmt2 = DateTimeFormat.forPattern("E d MMM yyyy" + "\n" + " h:mm a ");
DateTime dateTime1 = dateTime.plusHours(timeadded);
String endtimecalc = fmt2.print(dateTime1);
TextView endtime = findViewById(endtimetextView);
endtime.setText(endtimecalc);
String spinnerSelection = String.valueOf(spinner.getSelectedItem());
String spinnerSelection2 = String.valueOf(spinner2.getSelectedItem());
String q = quantity.getText().toString();
String d = duration.getText().toString();
//INSERT DATA TO DATABASE
boolean isInserted = myDb.insertData(
spinnerSelection,
spinnerSelection2,
q,
d,
formattedtime,
endtimecalc);
if (isInserted == true)
Toast.makeText(CreateLine.this, "Data Inserted Successfully", Toast.LENGTH_LONG).show();
else
Toast.makeText(CreateLine.this, "Data not Inserted", Toast.LENGTH_LONG).show();
}
});
nextButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Cursor res = myDb.getAllData();
StringBuffer buffer0 = new StringBuffer();
StringBuffer buffer1 = new StringBuffer();
StringBuffer buffer2 = new StringBuffer();
StringBuffer buffer3 = new StringBuffer();
StringBuffer buffer4 = new StringBuffer();
StringBuffer buffer5 = new StringBuffer();
StringBuffer buffer6 = new StringBuffer();
if ( res != null && res.moveToFirst()) {
do {
buffer0.setLength(0);
buffer1.setLength(0);
buffer2.setLength(0);
buffer3.setLength(0);
buffer4.setLength(0);
buffer5.setLength(0);
buffer6.setLength(0);
String getid = res.getString(0);
String getlt = res.getString(1);
String getpt = res.getString(2);
String getqty = res.getString(3);
String getdur = res.getString(4);
String getst = res.getString(5);
String getet = res.getString(6);
buffer0.append(getid);
buffer1.append(getlt);
buffer2.append(getpt);
buffer3.append(getqty);
buffer4.append(getdur);
buffer5.append(getst);
buffer6.append(getet);
} while (res.moveToNext());
}
Fragment fragment = new Fragment();
Bundle extras = new Bundle();
extras.putString("ID", buffer0.toString());
extras.putString("LineType", buffer1.toString());
extras.putString("PackageType", buffer2.toString());
extras.putString("Quantity", buffer3.toString());
extras.putString("Duration", buffer4.toString());
extras.putString("Starttime",buffer5.toString());
extras.putString("endtime", buffer6.toString());
fragment.setArguments(extras);
setContentView(R.layout.line_details);
SamplerAdapter samplesAdapter = new SamplerAdapter(getSupportFragmentManager());
ViewPager samplesPager = (ViewPager) findViewById(R.id.samplesPager);
samplesPager.setAdapter(samplesAdapter);
}
});
}
}
接收活动：
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View myInflatedView = inflater.inflate(R.layout.line_details, container, false);
Bundle extras = this.getArguments();
if (extras != null) {
String id = extras.getString("ID");
String linetype = extras.getString("LineType");
String packagetype = extras.getString("PackageType");
String Quantity = extras.getString("Quantity");
String Duration = extras.getString("Duration");
String Starttime = extras.getString("Starttime");
String endtime = extras.getString("endtime");
TextView LT = (TextView) getView().findViewById(R.id.textViewLT);
TextView PT = (TextView) getView().findViewById(R.id.textViewPT);
TextView QTY = (TextView) getView().findViewById(R.id.textViewQTY);
TextView DUR = (TextView) getView().findViewById(R.id.textViewDUR);
TextView ST = (TextView) getView().findViewById(R.id.textViewST);
TextView ET = (TextView) getView().findViewById(R.id.textViewET);
LT.setText(linetype);
PT.setText(packagetype);
QTY.setText(Quantity);
DUR.setText(Duration);
ST.setText(Starttime);
ET.setText(endtime);
}
return myInflatedView;
}
SAMPLERADAPTER CODE（使用getitem方法）：
public class SamplerAdapter extends FragmentStatePagerAdapter {
private final int mCount = 10;
private Bundle extras;
Fragment fragment = new Fragment();
public SamplerAdapter(FragmentManager fm, Bundle extras) {
super(fm);
this.extras = extras;
}
@Override
public int getCount() {
return mCount;
}
@Override
public Fragment getItem(int position) {
fragment.setArguments(extras);
return fragment;
}
@Override
public void finishUpdate(ViewGroup container) {
super.finishUpdate(container);
}
}
任何人都可以附加我的代码，以便它接收数据并将其显示到我指定的文本框中。
任何帮助都会很棒，谢谢。
答案 0 :(得分：1)
更改适配器构造函数以接收Bundle 将附加内容传递给构造函数，如
SamplerAdapter samplesAdapter = new SamplerAdapter(getSupportFragmentManager(), extras);
在SamplerAdapter类中为bundle
创建一个全局变量private Bundle extras;
public SamplerAdapter(FragmentManager fm, Bundle extras){
super(fm);
this.extras = extras;
}
// Now set these arguments in getItem method
@Override
public Fragment getItem(int position) {
// Create your fragment set arguments in that fragment
Fragment fragment = new LineDetails();
fragment.setArguments(bundle);
return fragment;
}
答案 1 :(得分：0)
首先，您无法在发送活动时创建片段。您必须在接收活动中创建它，以便实现所需的片段。
然后，要从发送活动到接收活动进行通信，您必须发送意图。 把你的包放在这个意图中。 在接收活动时，您可以调用getIntent（）。getExtras（）来获取您的包。 实现你的片段并像你一样给它捆绑。
另一件事，你的while循环是＆＃34;怪异的＆＃34;。如果您已经知道您将获得一行结果，请不要创建循环并且不要使用Stringbuilder。如果你可以有几行，不要在每个循环中重置StringBuilder的长度，因为它会覆盖每个新行的先前数据。
答案 2 :(得分：0)
从活动中您按意图发送数据：
Bundle bundle = new Bundle();
bundle.putString("edttext", "From Activity");
// set Fragmentclass Arguments
Fragmentclass fragobj = new Fragmentclass();
fragobj.setArguments(bundle);
并在Fragment onCreateView方法中：
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
String strtext = getArguments().getString("edttext");
return inflater.inflate(R.layout.fragment, container, false);
}
答案 3 :(得分：0)
有时您可以在活动中收到Intent，并且需要将信息传递给您的工作片段。如果您需要启动片段，但如果它仍然有效，则给定答案是正常的，setArguments()不是很有用。如果传递的信息将导致与您的UI交互，则会出现另一个问题。在这种情况下，你不能调用类似myfragment.passData()的东西，因为android会很快告诉只有创建视图的线程才能与之交互。