意图函数不能正常工作

Question

我面临的问题是，我通过putExtra从电话活动发送线路号，并在dial活动中接收到该值。第一次getIntent函数收到正确的值，但第二次他无法收到正确的值。第一个值在第二次显示

手机活动

    public class Phone extends Activity 
{

    List<Map<String, String>> data;
    Map<String, String> Line1;
    Map<String, String> Line2;
    Map<String, String> Line3;
    Map<String, String> Line4;
    Map<String, String> Line5;
    ListView Lines = null;
    public void onCreate(final Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        m_objPhone = this;
        String sPhoneAccountStatus = VaxStatus.m_objVaxStatus.GetPhoneAccountStatus();
        m_objPhoneAccountStatus.setText(sPhoneAccountStatus);
        data = new ArrayList<Map<String, String>>();
        Line1 = new HashMap<String, String>();
        Line1.put("title", "Line | 1" );
        Line1.put("status", "");
        data.add(Line1);

       Line2 = new HashMap<String, String>();
        Line2.put("title", "Line | 2" );
        Line2.put("status", "");
        data.add(Line2);
        Line3 = new HashMap<String, String>();
        Line3.put("title", "Line | 3" );
        Line3.put("status", "");
        data.add(Line3);
        Line4 = new HashMap<String, String>();
        Line4.put("title", "Line | 4" );
        Line4.put("status", "");
        data.add(Line4);
       Line5 = new HashMap<String, String>();
        Line5.put("title", "Line | 5" );
        Line5.put("status", "");
        data.add(Line5);
        SimpleAdapter adapter = new SimpleAdapter(this, data, android.R.layout.simple_list_item_2, new String[] {"title", "status"}, new int[] {android.R.id.text1, android.R.id.text2});
        Lines.setAdapter(adapter);
        for (int nLineNo = 0; nLineNo < VaxSIPUserAgent.TOTAL_LINE_COUNT; nLineNo++)
        {
            String sLineStatus = VaxStatus.m_objVaxStatus.GetLineStatus(nLineNo);
            SetStatus(nLineNo, sLineStatus);
        }

        Lines.setOnItemClickListener(new OnItemClickListener() 
        {
            public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) 
            {
                switch (arg2) 
                {
                    case 0: 
                        ShowDialPad(arg2, null);
                        break;
                    case 1:
                        ShowDialPad(arg2, null);
                        break;
                    case 2:
                        ShowDialPad(arg2, null);
                        break;
                    case 3:
                        ShowDialPad(arg2, null);
                        break;
                    case 4:
                        ShowDialPad(arg2, null);
                        break;
                    default:
                        break;
                }
            }
        });
    }
    @Override
    protected void onResume() 
    {
        for (int nLineNo = 0; nLineNo < VaxSIPUserAgent.TOTAL_LINE_COUNT; nLineNo++)
        {
            String sLineStatus = VaxStatus.m_objVaxStatus.GetLineStatus(nLineNo);
            SetStatus(nLineNo, sLineStatus);
        }
        super.onResume();
    }
    @Override
    protected void onStart() 
    {
        VaxPhone.m_objVaxVoIP.IsMuteMic();
        VaxPhone.m_objVaxVoIP.IsMuteSpk();
        IncommingCallSlider.m_objCallSlider.SetActiveActivity(this, R.id.PhoneRelativeLayout);
        IncommingCallRing.m_objIncommingCallRing.SetActiveActivity(this);
        DialCallTone.m_objDialCallTone.SetActiveActivity(this);
        super.onStart();
    }

    @Override
    protected void onStop() 
    {
        VaxPhone.m_objVaxVoIP.SetSpeakerState(m_objcheckSpkPhone.isChecked());
        super.onStop();
   }
    @Override
    protected void onDestroy() 
    {
        VaxStatus.m_objVaxStatus.SetPhoneActivity(null);
        super.onDestroy();
    }
    public void OnEndCall(int nLineNo)
    {   
        SetStatus(nLineNo, "Ready To Use!");
    }
    public static void OnContactPhoneNo(String sPhoneNo)
    {
        int nFreeLineNo = VaxPhone.m_objVaxVoIP.GetFreeLine();
        m_objPhone.ShowDialPad(nFreeLineNo, sPhoneNo);
    }

   public void ShowDialPad(int nFreeLineNo, String sPhoneNo) 
   {
       Intent intent = new Intent(Phone.this , DialPad.class);
       intent.addFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
       intent.putExtra("LineNo", nFreeLineNo);
       intent.putExtra("PhoneNo", sPhoneNo);
       startActivity(intent);
   }
   public void OnStatusPhone(int nLineNo, String sStatusMsg)
   {
       for (int LineNo = 0; LineNo < VaxSIPUserAgent.TOTAL_LINE_COUNT; LineNo++)
       {
           String sLineStatus = VaxStatus.m_objVaxStatus.GetLineStatus(LineNo);
           SetStatus(LineNo, sLineStatus);
       }
       if(m_objDialPad != null)
           m_objDialPad.OnStatusPhone(sStatusMsg);
   }
   public void OnStatusAccount(String sStatusMsg)
   {
       m_objPhoneAccountStatus.setText(sStatusMsg);
       if(m_objDialPad != null)
           m_objDialPad.OnStatusAccount(sStatusMsg);
   }


    public void showSelectedNumber(String number) 
    {
        Phone.OnContactPhoneNo(number);
    }
    void SetStatus(int nLineNo, String sStatusMsg)
    {
        if(nLineNo == 0)
        {
            Line1 = new HashMap<String, String>();
            Line1.put("title", "Line | 1" );
            Line1.put("status", sStatusMsg);
            data.set(0, Line1);
            SimpleAdapter adapter = new SimpleAdapter(this, data, android.R.layout.simple_list_item_2, new String[] {"title", "status"}, new int[] {android.R.id.text1, android.R.id.text2});
            Lines.setAdapter(adapter);
        }
        if(nLineNo == 1)
        {
            Line2 = new HashMap<String, String>();
            Line2.put("title", "Line | 2" );
            Line2.put("status", sStatusMsg);
            data.set(1, Line2);
            SimpleAdapter adapter = new SimpleAdapter(this, data, android.R.layout.simple_list_item_2, new String[] {"title", "status"}, new int[] {android.R.id.text1, android.R.id.text2});
            Lines.setAdapter(adapter);
        }
        if(nLineNo == 2)
        {
            Line3 = new HashMap<String, String>();
            Line3.put("title", "Line | 3" );
            Line3.put("status", sStatusMsg);
            data.set(2, Line3);
            SimpleAdapter adapter = new SimpleAdapter(this, data, android.R.layout.simple_list_item_2, new String[] {"title", "status"}, new int[] {android.R.id.text1, android.R.id.text2});
            Lines.setAdapter(adapter);
        }
        if(nLineNo == 3)
        {
            Line4 = new HashMap<String, String>();
            Line4.put("title", "Line | 4" );
            Line4.put("status", sStatusMsg);
            data.set(3, Line4);
            SimpleAdapter adapter = new SimpleAdapter(this, data, android.R.layout.simple_list_item_2, new String[] {"title", "status"}, new int[] {android.R.id.text1, android.R.id.text2});
            Lines.setAdapter(adapter);
        }
        if(nLineNo == 4)
        {
            Line5 = new HashMap<String, String>();
            Line5.put("title", "Line | 5" );
            Line5.put("status", sStatusMsg);
            data.set(4, Line5);
            SimpleAdapter adapter = new SimpleAdapter(this, data, android.R.layout.simple_list_item_2, new String[] {"title", "status"}, new int[] {android.R.id.text1, android.R.id.text2});
            Lines.setAdapter(adapter);
        }
    }
}

拨号活动

public class DialPad extends Activity 
{
    private TextView m_objStatus;
    private Button m_objBtnDial; 


    int m_nLineNo = -1;
    boolean m_objContactFlag;
    public static Phone m_objPhone;
    private static String[] m_objPhoneNum = new String[VaxSIPUserAgent.TOTAL_LINE_COUNT];
    public void onCreate(Bundle savedInstanceState)
    {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        Phone.m_objDialPad = this;
        Intent intent = getIntent();
        int nIntentExtraLineNo = intent.getIntExtra("LineNo", 1);
        m_nLineNo = nIntentExtraLineNo; 

        final int [] aLineArray =  new int[VaxSIPUserAgent.TOTAL_LINE_COUNT - 1];
        int nIndex = 0;
        for (int nLineNo = 0; nLineNo < VaxSIPUserAgent.TOTAL_LINE_COUNT; nLineNo++)
        {
            if(m_nLineNo ==  nLineNo)
                continue;
            aLineArray[nIndex] =  nLineNo + 1;
            nIndex++;
        }
        String sLineStatus = VaxStatus.m_objVaxStatus.GetLineStatus(m_nLineNo);
        OnStatusPhone(sLineStatus);

             String sPhoneNo = intent.getStringExtra("PhoneNo");
        if(sPhoneNo != null)
        {
            m_objPhoneNum[nIntentExtraLineNo] = sPhoneNo;
        }
        m_objEditDialscreen.setText(m_objPhoneNum[nIntentExtraLineNo]);
    }


    @Override
    protected void onStart() 
    {

        UpdateDialBtn();

        if(m_objContactFlag == false)
            m_objEditDialscreen.setText(m_objPhoneNum[m_nLineNo]);
        IncommingCallSlider.m_objCallSlider.SetActiveActivity(this, R.id.dialpad);
        IncommingCallRing.m_objIncommingCallRing.SetActiveActivity(this);
        DialCallTone.m_objDialCallTone.SetActiveActivity(this);
        super.onStart();
    }

    @Override
    protected void onStop() 
    {
        m_objPhoneNum[m_nLineNo] = m_objEditDialscreen.getText().toString();
        super.onStop();
    }

 }

Answer 1

Phone活动使用Intent.FLAG_ACTIVITY_REORDER_TO_FRONT启动DialPad活动。这意味着，如果在任务堆栈中已经有一个活动的(未完成的)DialPad实例，那么这个活动的实例将被简单地移动到前面(活动堆栈的顶部)。在这种情况下，onCreate() 将不会在DialPad上被调用，因为它没有重新创建活动。相反，将调用onNewIntent()。你没有在DialPad中重写这个方法，所以你不会看到这个方法调用。

由于您是从onCreate()中的Intent extra中提取LineNo和PhoneNo，因此您将始终只使用从第一个Intent中获得的数据。这正是你所看到的问题。

要修复它，覆盖onNewIntent()，并从onNewIntent()中收到的Intent参数中传递的额外参数中提取LineNo和PhoneNo。

Answer 2

尝试创建一个Bundle对象，然后通过intent. putextras (Bundle)传递它，这是通过intent传递额外内容的正确方式(我理解nFreeLineNo是int而sPhoneNo是String):

Intent intent = new Intent(Phone.this , DialPad.class);
intent.addFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
Bundle b = new Bundle();
b.putInt("LineNo", nFreeLineNo);
b.putString( "PhoneNo", sPhoneNo);
intent.putExtras(b);
startActivity(intent);

同样，在DialPad中，getExtras像这样:

Intent intent = getIntent();
Bundle b = intent.getExtras();
//Make sure you passed a bundle
if (b != null){
    m_nLineNo = b.getInt("LineNo");
    m_sPhoneNo = b.getString("PhoneNo");
}else{
     //didnt pass bundle, Do what you want
}

希望我对你有所帮助，我也遇到过这个问题，并以这种方式解决了

如果这对你没有帮助，请从Logcat发布错误堆栈跟踪