//1.startActivityForResult方式启动BActivity
Intent intent = new Intent(AActivity.this, BActivity.class); startActivityForResult(intent, 1);//1是启动BActivity的请求码////2.重写onActivityResult方法
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// TODO Auto-generated method stub
super.onActivityResult(requestCode, resultCode, data);
//确认是B返回到A的
if(requestCode == 1 && resultCode == 11){
boolean buttonIsClicked = data.getBooleanExtra("buttonIsClicked", false);
if(buttonIsClicked){
Toast.makeText(this, "buttonIsClicked", Toast.LENGTH_LONG).show();
}
//做相关操作
}
｝第二步（BActivity里面）：//监听BActivity中的按返回事件，设置结果码
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if(keyCode == KeyEvent.KEYCODE_BACK && event.getAction() == KeyEvent.ACTION_DOWN) {
intent = new Intent();
intent.putExtra("buttonIsClicked", isClick);
BActivity.this.setResult(11, intent);//11是结果码
BActivity.this.finish();
}
return super.onKeyDown(keyCode, event);
}