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intent.setClass

萧渝
2023-12-01
一、不需要返回值的跳转
Intent intent=new Intent();
intent.setClass(目前的acitivy.this, 目标activity.class);
startActivity(intent);
 

二、需要返回值的跳转
Intent intent=new Intent();
intent.setClass(目前的acitivy.this, 目标activity.class);
startActivity(intent);
startActivityForResult(intent, 状态值(int类型));
状态值作为接受目标返回值的验证。
requestCode 接收返回的状态值
resultCode :RESULT_OK  RESULT_CANCELED 可以自己赋值,按返回键时,系统默认赋值为:RESULT_CANCELED
目标activity 关闭才能返回请求activity
例如:
  1、请求页面
public class MainActivy extends Activity {
   
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        Intent intent=new Intent();
        intent.setClass(MainActivy.this, ReceiveMSG.class);
        startActivityForResult(intent, 0);      
    }
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        // TODO Auto-generated method stub
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode==0) {
            if (resultCode==RESULT_OK) {
                Toast.makeText(this, "Send SMS RESULT_OK", Toast.LENGTH_SHORT).show();
            }else if (resultCode==RESULT_CANCELED) {
                Toast.makeText(this, "result cancel", Toast.LENGTH_SHORT).show();
            }else {
                Toast.makeText(this, resultCode, Toast.LENGTH_SHORT).show();
            }
        }else {
            Toast.makeText(this, "requsetcode not 0", Toast.LENGTH_SHORT).show();
        }
       
    }
}
2、接收返回值界面
public class ReceiveMSG extends Activity{
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);        
        ReceiveMSG.this.setResult(RESULT_OK);
        this.finish();       
    }
}

      //通过Bundle向要打开的的Activity传递一些数据

       Bundle bundle = new Bundle();
       bundle.putString("data", new String(" Hello World"));
       intent.putExtras(bundle);



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