从AActivity向BActivity跳转后，关闭BActivity并向AActivity回调一些数据： 建立AActivity.java文件： 1 public class AActivity extends AppCompatActivity { 2 private Button btnJump; 3 @Override 4 protected void onCreate(Bundle savedInstanceState) { 5
1 public class AActivity extends AppCompatActivity { 2 private Button btnJump; 3 @Override 4 protected void onCreate(Bundle savedInstanceState) { 5 super.onCreate(savedInstanceState); 6 setContentView(R.layout.activity_aa
