class PromptRunnable implements Runnable {
	private String v;
	void setValue(String inV) {
		this.v = inV;
	}
	String getValue() {
		return this.v;
	}
	public void run() {
		this.run();
	}
}

void promptForResult(final PromptRunnable postrun) {
	Builder alert = new AlertDialog.Builder(this);
	alert.setTitle("Title");
	alert.setMessage("Message.");
	// Create textbox to put into the dialog
	final EditText input = new EditText(this);
	// put the textbox into the dialog
	alert.setView(input);
	// procedure for when the ok button is clicked.
	alert.setPositiveButton("Ok", new DialogInterface.OnClickListener() {  
		public void onClick(DialogInterface dialog, int whichButton) {
			String value = input.getText().toString();
			dialog.dismiss();
			// set value from the dialog inside our runnable implementation
			postrun.setValue(value);
			// ** HERE IS WHERE THE MAGIC HAPPENS! **
			// now that we have stored the value, lets run our Runnable
			postrun.run();
			return;
		}
	});

	alert.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
		public void onClick(DialogInterface dialog, int which) {
			dialog.dismiss();
			return;
		}
	});
	alert.show();
}

promptForResult(new PromptRunnable(){
	// put whatever code you want to run after user enters a result
	public void run() {
		// get the value we stored from the dialog
		String value = this.getValue();
		// do something with this value...
		// In our example we are taking our value and passing it to 
		// an activity intent, then starting the activity.
		Intent i = new Intent(getApplication(), MyActivity.class);
		i.putExtra("extraValue", value);
		startActivity(i);
	}
});