如何在 ViewPager 中将值从一个 Fragment 传递到另一个?
How to pass values from one Fragment to another in a ViewPager?
我对 Android 编程完全陌生。我正在写一个有两个片段的地方:Query 和 Results。查询片段中有一个 Button 和一个 EditText。当用户单击 Button 时,EditText 的结果应显示在 Results Fragment 中的 TextView 中。
这是主要的Activity(起点):
public class StartingPoint extends FragmentActivity
{
ViewPager viewPager;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
if (android.os.Build.VERSION.SDK_INT > 9)
{
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
}
viewPager = (ViewPager)findViewById(R.id.pager);
viewPager.setAdapter(new FragmentsPagerAdapter(getSupportFragmentManager()));
}
}
这里是 QueryFragment.java:
public class QueryFragment extends Fragment
{
EditText queryET, endpointET;
Button execute;
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState)
{
// Get the view from fragmenttab1.xml
View view = inflater.inflate(R.layout.query_fragment, container, false);
queryET = (EditText) view.findViewById(R.id.sparqlQueryET);
endpointET = (EditText) view.findViewById(R.id.sparqlEndpointET);
execute = (Button) view.findViewById(R.id.executeButton);
execute.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v)
{
// TODO Auto-generated method stub
String query = queryET.toString();
String endpoint = endpointET.toString();
Query q = QueryFactory.create(query, Syntax.syntaxARQ);
q.setOffset(1);
QueryExecution qe = QueryExecutionFactory.sparqlService(endpoint, query);
ResultSet rs = qe.execSelect();
StringBuffer results = new StringBuffer();
List<String> columnNames = rs.getResultVars();
while(rs.hasNext())
{
QuerySolution qs = rs.next();
for(String var: columnNames)
{
results.append(var +":");
if(qs.get(var) == null)
results.append("{null}");
else if (qs.get(var).isLiteral())
results.append(qs.getLiteral(var).toString());
else
results.append(qs.getResource(var).getURI());
results.append('\n');
}
results.append("----------------\n");
}
qe.close();
}
});
return view;
}
}
这是结果片段:
public class ResultsFragment extends Fragment
{
TextView r;
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState)
{
// Get the view from fragmenttab1.xml
View view = inflater.inflate(R.layout.results_fragment, container, false);
r = (TextView) view.findViewById(R.id.resultsTV);
return view;
}
}
现在我的问题是,如何将在(QueryFragment 的)onClick
方法中处理的结果(一个字符串)传递到 ResultsFragment,其中字符串将显示在 TextView 中?
简单的方法是:在父 activity
中创建 public static String
字段。 onClick
方法会将信息设置到这个值中,onCreateView 结果片段会尝试从那里获取它。
onClick(View v){
MainActivity.myResultString = "result code";
}
并在需要时获取;
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState)
{
View view = inflater.inflate(R.layout.results_fragment, container, false);
r = (TextView) view.findViewById(R.id.resultsTV);
r.setText(MainActivity.myResultString);
return view;
}
像这样。它没有完成解决方案,但可以帮助你)祝你好运。
我对 Android 编程完全陌生。我正在写一个有两个片段的地方:Query 和 Results。查询片段中有一个 Button 和一个 EditText。当用户单击 Button 时,EditText 的结果应显示在 Results Fragment 中的 TextView 中。
这是主要的Activity(起点):
public class StartingPoint extends FragmentActivity
{
ViewPager viewPager;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
if (android.os.Build.VERSION.SDK_INT > 9)
{
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
}
viewPager = (ViewPager)findViewById(R.id.pager);
viewPager.setAdapter(new FragmentsPagerAdapter(getSupportFragmentManager()));
}
}
这里是 QueryFragment.java:
public class QueryFragment extends Fragment
{
EditText queryET, endpointET;
Button execute;
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState)
{
// Get the view from fragmenttab1.xml
View view = inflater.inflate(R.layout.query_fragment, container, false);
queryET = (EditText) view.findViewById(R.id.sparqlQueryET);
endpointET = (EditText) view.findViewById(R.id.sparqlEndpointET);
execute = (Button) view.findViewById(R.id.executeButton);
execute.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v)
{
// TODO Auto-generated method stub
String query = queryET.toString();
String endpoint = endpointET.toString();
Query q = QueryFactory.create(query, Syntax.syntaxARQ);
q.setOffset(1);
QueryExecution qe = QueryExecutionFactory.sparqlService(endpoint, query);
ResultSet rs = qe.execSelect();
StringBuffer results = new StringBuffer();
List<String> columnNames = rs.getResultVars();
while(rs.hasNext())
{
QuerySolution qs = rs.next();
for(String var: columnNames)
{
results.append(var +":");
if(qs.get(var) == null)
results.append("{null}");
else if (qs.get(var).isLiteral())
results.append(qs.getLiteral(var).toString());
else
results.append(qs.getResource(var).getURI());
results.append('\n');
}
results.append("----------------\n");
}
qe.close();
}
});
return view;
}
}
这是结果片段:
public class ResultsFragment extends Fragment
{
TextView r;
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState)
{
// Get the view from fragmenttab1.xml
View view = inflater.inflate(R.layout.results_fragment, container, false);
r = (TextView) view.findViewById(R.id.resultsTV);
return view;
}
}
现在我的问题是,如何将在(QueryFragment 的)onClick
方法中处理的结果(一个字符串)传递到 ResultsFragment,其中字符串将显示在 TextView 中?
简单的方法是:在父 activity
中创建 public static String
字段。 onClick
方法会将信息设置到这个值中,onCreateView 结果片段会尝试从那里获取它。
onClick(View v){
MainActivity.myResultString = "result code";
}
并在需要时获取;
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState)
{
View view = inflater.inflate(R.layout.results_fragment, container, false);
r = (TextView) view.findViewById(R.id.resultsTV);
r.setText(MainActivity.myResultString);
return view;
}
像这样。它没有完成解决方案,但可以帮助你)祝你好运。