Android Activity 之 startActivityForResult 的使用

startActivityForResult 的作用：A—> B，B关闭时返回参数给A

 

AActivity.java

//打开B  
Intent intent = new Intent(this,BActivity.class);startActivityForResult(intent, 1);//startActivityForResult使用这个新的Activity关闭后能返回参数,1是发送参数  
  
@Override  
protected void onActivityResult(int requestCode, int resultCode, Intent data) {  
    super.onActivityResult(requestCode, resultCode, data);  
    if(requestCode == 1){   //requestCode =1就是上面打开B时传递的发送参数，主要用来区分A打开多个Activity时进行区分  
      if(resultCode == RESULT_OK){  //resultCode =RESULT_OK是B传送回来的参数，  
    Bundle bundle = data.getExtras();//Intent data为B传送回来的Intent里面带的参数  
           String name = bundle.getDouble("name");//得到经纬度  
      }       
    }  
}  

 BActivity.java

Intent intent = new Intent();  
Bundle bundle = new Bundle();  
bundle.putString("name", "xiaozhu");  
intent.putExtras(bundle);  
BActivity.this.setResult(RESULT_OK, intent);    //返回给A的发送参数  
BActivity.this.finish();  //必须在setResult后关闭