ANDROID：从2个不同的Activity（不同的Intent）开始相同的Activity

Question

I have a little problem: I have 3 Activity. Activity ListClass.java

public class ListClass extends Activity {

......


listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> parent, View view,
                int position, long id) {

            onItemClick1(parent, view, position, id);

        }

    });

}

public void onItemClick1(AdapterView<?> parent, View view, int position,
        long id) {

    String name = (String) parent.getItemAtPosition(position);
    String address = (String) listAddress.get(position);
    int status = (int) listStatus.get(position);
    double lat = (double) listLat.get(position);
    double lng = (double) listLng.get(position);
    String serialNumber = (String) listSerialNumber.get(position);

    getIntent().putExtra("name", name);
    getIntent().putExtra("address", address);
    getIntent().putExtra("status", status);
    getIntent().putExtra("latitude", lat);
    getIntent().putExtra("longitude", lng);
    getIntent().putExtra("serialNumber", serialNumber);

    startActivity(getIntent());

}

public Intent getIntent() {
    Intent intent = new Intent(ListClass.this, ClassB.class);
    return intent;
}

As you can see I putExtra values that I use on ClassB.java :

public class ClassB extends Activity {

TextView textViewTitle;
TextView textView2;
TextView textViewInfo;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.charge_box);
    this.textViewTitle = (TextView) findViewById(R.id.charge_box__textView1);
    this.textView2 = (TextView) findViewById(R.id.charge_box__textView2);
    this.textViewInfo = (TextView) findViewById(R.id.charge_box__textView3);
    getActionBar().setDisplayHomeAsUpEnabled(true);
    Bundle bundle = getIntent().getExtras();
    String name = bundle.getString("name");
        String address = bundle.getString("address");
        int status = bundle.getInt("status");
        textViewTitle.setText(name);
        textViewInfo.setText(address + " " + status);

    }
}

SO FAR SO GOOD! But I need to start ActivityB from another activity that is MainClass.java.

    Intent intent = new Intent(MainActivity.this,
                    ClassB.class);

            startActivity(intent);

the problem is that when ClassB uses Bundle bundle = getIntent().getExtras(); he doesn't find "extras" because Intent of MainClass is different from Intent of ListClass! how can I do?? can I decide which Intent use? tahnk you!

EDIT: @skygeek ok I'm working on it, but how can I create a static variable if the extra values change?

public void onItemClick1(AdapterView<?> parent, View view, int position,
        long id) {

    String name = (String) parent.getItemAtPosition(position);
    String address = (String) listAddress.get(position);
    int status = (int) listStatus.get(position);
    double lat = (double) listLat.get(position);
    double lng = (double) listLng.get(position);
    String serialNumber = (String) listSerialNumber.get(position);

    Intent intent = new Intent(ListClass.this, ChargeBoxInfoActivity.class);
    intent.putExtra("name", name);
    intent.putExtra("address", address);
    intent.putExtra("status", status);
    intent.putExtra("latitude", lat);
    intent.putExtra("longitude", lng);
    intent.putExtra("serialNumber", serialNumber);
    startActivity(intent);
}

Answer 1

Make a check inside ClassB's onCreate method

     if(getIntent().getExtras() != null)
     {
     // do your functionality with extras
        Bundle bundle = getIntent().getExtras();
        String name = bundle.getString("name");
        String address = bundle.getString("address");
        int status = bundle.getInt("status");
        textViewTitle.setText(name);
        textViewInfo.setText(address + " " + status);
     }

     else
      {
       // do whatever you want to do
      }

Answer 2

create an static object with static field intent when calling the activity for first time(check if its null). So next time you call the same activity from another class use this same static object having the already set intent to call the activity again and hence you will find those extras!

Answer 3

This is wrong:

getIntent().putExtra("name", name);
getIntent().putExtra("address", address);
getIntent().putExtra("status", status);
getIntent().putExtra("latitude", lat);
getIntent().putExtra("longitude", lng);
getIntent().putExtra("serialNumber", serialNumber);
startActivity(getIntent());

}

public Intent getIntent() {
Intent intent = new Intent(ListClass.this, ClassB.class);
return intent;  

}

You create new intent after each function call getIntent()... Try this:

Intent intent = new Intent(ListClass.this, ClassB.class);
intent.putExtra("name", name);
intent.putExtra("address", address);
intent.putExtra("status", status);
intent.putExtra("latitude", lat);
intent.putExtra("longitude", lng);
intent.putExtra("serialNumber", serialNumber);
startActivity(intent);

Answer 4

I understand... try this:

try{
Bundle bundle = getIntent().getExtras();
String name = bundle.getString("name");
    String address = bundle.getString("address");
    int status = bundle.getInt("status");
    textViewTitle.setText(name);
    textViewInfo.setText(address + " " + status);
}}catch (Exception ignored) {
}