如何在后台的两个Android活动之间交换数据以通过蓝牙发送数据？

Question

I need to pass data from Activity A to Activity B and backwards in background, because Activity A has method, which initializing class, which is managing bluetooth connection, and I cant initialize that class from Activity B , because method in Activity A has already initialized it.

I tried to make method that I need to make static , but from static method I cant call non-static methods from my bluetooth class:

   public static void setup(String address) {
            bt = new Bluetooth(this, handler);
            outStringBuffer = new StringBuffer("");
            bt.startConn(address);
        //Java throws error that bt is non-static
   }

So my questions:

1. Is there a way to call setup() from another class when it is non-static ?
2. And if answer is YES how? Or if answer is NO How to pass data without calling any methods.

Keep in mind that startActivityForResult() or startActivity() will not solve this problem, because I need to send data from Activity B to A many times and Activity A should call method from my bluetooth class which sends that data via bluetooth.

PS I found a way with ViewFlipper, but in my case this is too complicated to merge two classes. And I cant send data directly from Activity B to Bluetooth class, because Activity A has already opened socket and Java will throw exception that it cant start activity or something like that.

Answer 1

OK that's very nice...to pass strings from activity 1 to activity 2 you need

A method to pass and retrieve this, Intents

public void setUp (String address) {
/* start an intent to pass the string data*/
Intent intent = new Intent(GridViewActivity.this,       MovieDetailActivity.class);

/* use the intent object to pass string to another activity using putExtra method */

intent.putExtra("your string");
 start intent(intent);
}

Then in your receiving activity use getStringExtra

final String original_title =     getIntent().getStringExtra("your string");

then you can use this variable pass from activity using Intent and PutExra and getIntent and getStringExtra methods

You can google more on this. Passing data from activity using intents.