startActivityForResult浅入理解

来源：互联网发布：sql查询有的时间慢编辑：程序博客网时间：2024/06/10 14:18

对startActivityForResult理解，通过简单例子有了浅的理解，通过他可以实现两个activity之间相互传递数据。

MainActivity和TwoActivity之间传递数据，并修改UI，在TwoActivity中使用handler处理Intent，在MainActivity中onActivityResult中修改UI界面，这样可以实现，

public class MainActivity extends Activity {private TextView tv_text;private Button bt_change;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);tv_text = (TextView) findViewById(R.id.tv_text);bt_change = (Button) findViewById(R.id.bt_change);bt_change.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {Intent intent = new Intent(getApplicationContext(), TwoActivity.class);startActivityForResult(intent, 0);}});}@Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data) {// TODO Auto-generated method stubsuper.onActivityResult(requestCode, resultCode, data);Bundle extras = data.getExtras();String string = extras.getString("value");System.out.println("接收到："+string);tv_text.setText(string);bt_change.setVisibility(View.GONE);}}

public class TwoActivity extends Activity {private MainHandler handler;@Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onCreate(savedInstanceState);setContentView(R.layout.activity_two);Button bt_send = (Button) findViewById(R.id.bt_send);handler = new MainHandler();onClick(bt_send);}class MainHandler extends Handler{@Overridepublic void handleMessage(Message msg) {// TODO Auto-generated method stubsuper.handleMessage(msg);switch (msg.what) {case 0:Intent intent = getIntent();Bundle bundle = new Bundle();bundle.putString("value", "我来了");Intent extras = intent.putExtras(bundle);TwoActivity.this.setResult(0, extras);TwoActivity.this.finish();break;default:break;}}}private void onClick(Button bt_send) {bt_send.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubhandler.sendEmptyMessageDelayed(0, 1000);}});}}

在TwoActivity中通过getIntent()方法获取上一个activity传过来的intent，在这个intent设置数据，在setResult()方法中加入数据，这样就可以在onActivityResult()中接收数据了。

以上只是我这个菜鸟平时学习的一些总结，若是有不对的地方和不足之处请多多指教。

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