如何使用 bundle 一次从多个活动中获取数据
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【中文标题】如何使用 bundle 一次从多个活动中获取数据【英文标题】：how to use bundle to get data from multiple activities at a time 【发布时间】：2013-08-13 11:17:08 【问题描述】：我创建了一个应用程序，它从 sql server 的 2 个表中获取多选数据。 我使用了 2 个 edittext 来放置该数据；我正在使用捆绑包从 2 个活动中获取数据，但我没有获取数据。 我的代码是：
try
Bundle bn = getIntent().getExtras();
ArrayList<String> data= bn.getStringArrayList("selectedItems");
ArrayList<String> data2= bn.getStringArrayList("selectedItems2");
// String[] resultArr = b.getStringArray("selectedItems");
StringBuilder string = new StringBuilder();
for(int i=0;i<data.size();i++)
string.append(data.get(i).toString()+"\n");
for(int i=0;i<data2.size();i++)
string2.append(data2.get(i).toString()+"\n");
area.setText(string2);
wwith.setText(string);
catch(Exception e)
e.printStackTrace();
谁能建议我如何使用 bundle 从多个活动中获取数据？
主 Activity 的完整代码
public class DcrOpen extends Activity
StringBuilder string=null;
StringBuilder string2=null;
EditText date,wwith,area;
Spinner with;
Button save,back,get,get1;
String paid5;
String dcrdate;
MyConnection mycon;
String mydate;
public void onCreate(Bundle b)
super.onCreate(b);
setContentView(R.layout.dcropen);
date=(EditText)findViewById(R.id.date);
wwith=(EditText)findViewById(R.id.workwith);
area=(EditText)findViewById(R.id.area);
with=(Spinner)findViewById(R.id.worktype);
save=(Button)findViewById(R.id.save);
back=(Button)findViewById(R.id.bkdays);
get=(Button)findViewById(R.id.get);
get1=(Button)findViewById(R.id.get1);
mycon=new MyConnection(DcrOpen.this);
int paid=MyConnection.PA_ID;
try
Bundle bn = getIntent().getExtras();
ArrayList<String> data= bn.getStringArrayList("selectedItems");
ArrayList<String> data2= bn.getStringArrayList("selectedItems2");
// String[] resultArr = b.getStringArray("selectedItems");
StringBuilder string = new StringBuilder();
for(int i=0;i<data.size();i++)
string.append(data.get(i).toString()+"\n");
for(int i=0;i<data2.size();i++)
string2.append(data2.get(i).toString()+"\n");
area.setText(string2);
wwith.setText(string);
catch(Exception e)
e.printStackTrace();
ResultSet rs2;
try
Statement smt=mycon.connection().createStatement();
rs2=smt.executeQuery("DCRDATEDDL "+paid+"");
if(rs2.next()==false)
String mydate3=rs2.getString("DATE_NAME");
date.setText(mydate3);
rs2=smt.executeQuery("WORKINGTYPE");
List<String>data1=new ArrayList<String>();
while(rs2.next())
data1.add(rs2.getString("FIELD_NAME"));
ArrayAdapter<String>dataadapter=new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item,data1);
dataadapter.setDropDownViewResource(android.R.layout.simple_list_item_single_choice);
with.setAdapter(dataadapter);
catch(Exception e)
back.setOnClickListener(new OnClickListener()
@Override
public void onClick(View v)
// TODO Auto-generated method stub
Intent i=new Intent(getApplicationContext(),DcrMenu.class);
startActivity(i);
);
get.setOnClickListener(new OnClickListener()
@Override
public void onClick(View v)
// TODO Auto-generated method stub
Intent i=new Intent(getApplicationContext(),ListviewHelper.class);
startActivity(i);
);
get1.setOnClickListener(new OnClickListener()
@Override
public void onClick(View v)
// TODO Auto-generated method stub
Intent in=new Intent(getApplicationContext(),ListviewHelper2.class);
startActivity(in);
);
活动列表viewHelper
public class ListviewHelper extends Activity implements OnClickListener
Button button;
ListView listView;
ArrayAdapter<String> adapter;
MyConnection mycon;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.data_list);
mycon=new MyConnection(ListviewHelper.this);
int pa_id=mycon.PA_ID;
ResultSet rs;
List<String>data=new ArrayList<String>();
try
Statement smt=mycon.connection().createStatement();
rs=smt.executeQuery("WORKWITH "+pa_id+",'','','','','','',''");
while(rs.next())
data.add(rs.getString("PA_NAME"));
catch(Exception e)
e.printStackTrace();
findViewsById();
adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_multiple_choice, data);
listView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
listView.setAdapter(adapter);
button.setOnClickListener(this);
private void findViewsById()
listView = (ListView) findViewById(R.id.list);
button = (Button) findViewById(R.id.testbutton);
public void onClick(View v)
SparseBooleanArray checked = listView.getCheckedItemPositions();
ArrayList<String> selectedItems = new ArrayList<String>();
for (int i = 0; i < checked.size(); i++)
// Item position in adapter
int position = checked.keyAt(i);
// Add sport if it is checked i.e.) == TRUE!
if (checked.valueAt(i))
selectedItems.add(adapter.getItem(position));
String[] outputStrArr = new String[selectedItems.size()];
List<String>data=new ArrayList<String>(selectedItems.size());
for (int i = 0; i < selectedItems.size(); i++)
// outputStrArr[i] = selectedItems.get(i);
Intent intent = new Intent(getApplicationContext(),
DcrOpen.class);
// Create a bundle object
Bundle b = new Bundle();
b.putStringArrayList("selectedItems", selectedItems);
// Add the bundle to the intent.
intent.putExtras(b);
// start the ResultActivity
startActivity(intent);
活动列表viewHelper2
public class ListviewHelper2 extends Activity implements OnClickListener
Button button;
ListView listView;
ArrayAdapter<String> adapter;
MyConnection mycon;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.data_list2);
mycon=new MyConnection(ListviewHelper2.this);
int pa_id=mycon.PA_ID;
ResultSet rs;
List<String>data=new ArrayList<String>();
try
Statement smt=mycon.connection().createStatement();
rs=smt.executeQuery("DCRAREADDL "+pa_id+",'','','',''");
while(rs.next())
data.add(rs.getString("AREA"));
catch(Exception e)
e.printStackTrace();
findViewsById();
adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_multiple_choice, data);
listView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
listView.setAdapter(adapter);
button.setOnClickListener(this);
private void findViewsById()
listView = (ListView) findViewById(R.id.list2);
button = (Button) findViewById(R.id.testbutton2);
public void onClick(View v)
SparseBooleanArray checked = listView.getCheckedItemPositions();
ArrayList<String> selectedItems = new ArrayList<String>();
for (int i = 0; i < checked.size(); i++)
// Item position in adapter
int position = checked.keyAt(i);
// Add sport if it is checked i.e.) == TRUE!
if (checked.valueAt(i))
selectedItems.add(adapter.getItem(position));
String[] outputStrArr = new String[selectedItems.size()];
List<String>data=new ArrayList<String>(selectedItems.size());
for (int i = 0; i < selectedItems.size(); i++)
// outputStrArr[i] = selectedItems.get(i);
Intent intent = new Intent(getApplicationContext(),
DcrOpen.class);
// Create a bundle object
Bundle b = new Bundle();
b.putStringArrayList("selectedItems2", selectedItems);
// Add the bundle to the intent.
intent.putExtras(b);
// start the ResultActivity
startActivity(intent);
【问题讨论】：
您从 bundle 中获取数据的趋势是正确的，但您能告诉我们您将数据放入您的意图的位置吗？ 我写了完整的代码...... 但首先你需要用你的数据填充你的意图，例如：intent.putExtra("example", example);然后启动意图并在创建活动中使用您的代码获取数据:) 【参考方案1】：当您填充引导您进行此活动的意图时，您可以使用getIntent.getExtras()。例如 ：
在活动 1 中：
Intent intent = new Intent(activity1.this, activity2.class);
intent.putExtra("test", test);
startActivity(intent);
然后在第二个活动（活动2）中你可以使用这个：
String test = getIntent().getExtras().get("test");
但 OnCreate() 中的 Bundle 是您可以在当前活动中使用 onSaveInstanceState(Bundle) 设置数据以保存数据（例如调用 onStop() 时）时使用的包。
【讨论】：
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