Android Activity 之 startActivityForResult 的施用

Android Activity 之 startActivityForResult 的使用

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

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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