android开发中,给Spinner中选项设置触发事件，实现不同Activity的跳转

/*实现到支付宝和银联界面的跳转并从两个界面传值*/

public class MainActivity extends AppCompatActivity implements AdapterView.OnItemSelectedListener {

Intent intent;

private int requestCode;

private Spinner sp;

private String[] data;

private TextView tv;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

initData();

initView();

}

/**

*处理组件的方法

*/

private void initView() {

tv = ((TextView) findViewById(R.id.tv));

//需要适配的View,是"v"

sp = ((Spinner) findViewById(R.id.sp));

//接下来是创建MVC中的"c" controler

ArrayAdapter<String> adapter=new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,data);

sp.setAdapter(adapter);

sp.setOnItemSelectedListener(this);

}

private void initData() {//初始化数据

data = new String[]{"请选择","支付宝","银联"};

}

/*

*处理从银联和支付宝返回数据的方法

*/

@Override

protected void onActivityResult(int requestCode, int resultCode, Intent data) {

super.onActivityResult(requestCode, resultCode, data);

if (222==requestCode&&resultCode==999){

//说明是从银联页面返回了,读取intent携带的信息

int money=data.getIntExtra("money",0);

tv.setText("付款金额:"+money+"元");

}else if (111==requestCode&&resultCode==888){

//说明是从支付宝页面返回了,读取intent携带的信息

int money=data.getIntExtra("money",0);

int privilege=data.getIntExtra("privilege",0);

tv.setText("付款金额:"+money+"元,优惠金额:"+privilege+"元");

}

}

/*spinner被点击事件的处理*/

@Override

public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {

String str=sp.getSelectedItem().toString();

if ("支付宝".equals(str)){

intent=new Intent(this,ZhifubaoActivity.class);

requestCode=111;

}else if ("银联".equals(str)){

intent=new Intent(this,YinlianActivity.class);

requestCode=222;

}else {

return;

}

//如果不需要跳转的页面返回值,下面可以直接用startActivity(intent);

startActivityForResult(intent, requestCode);

}

@Override

public void onNothingSelected(AdapterView<?> parent) {

}

}