Android实例-Activity间的值传递

案例描述：activityA跳转到activityB获取数据后返回A，并将数据显示到A中

一、在activityA中使用startActivityForResult方法跳转到B中

public void choice(View vIew){
        Intent intent=new Intent(this,activityB.class);
//        startActivity(intent);
        startActivityForResult(intent,0);
    }

二、在activityB中使用setRsult设置数据返回给A并关闭

public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                Intent intent=new Intent(activityB.this,activityA.class);
                String data="我是数据"
                intent.putExtra("data",data);
                setResult(0,intent);
                finish();
            }

三、在A中使用onActivityResult获取数据

protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        String da=data.getStringExtra("data");
        Toas.makeText(this,""+da,Toast.LENGTH_SHORT).show();
    }