handler

handler_callback.java

public class Test {
	static{
		System.loadLibrary("test");
	}
	public native int getStringLen(String str);
	
	private CallBack callBack;
	
	public void setCallBack(CallBack callBack){
		this.callBack = callBack;
	}
	
	public interface CallBack{
		public abstract void callback();
	}
	
	private Handler mHandler = new Handler(){
		@Override
		public void handleMessage(Message msg) {
			Test.this.callBack.callback();
		}
	};
	
	//call by c function
	public void calledByC(int params){
		mHandler.sendMessage(new Message());
	}
}

public class TestActivity extends Activity implements CallBack{
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
    }

	public void callback() {
		// TODO Auto-generated method stub
		
	}
}