现在有一个activity1调用另一个activity2,调用activity2后,在把值传给activity1
activity1:
public class IntentActivity extends Activity { private Button btn=null; private final static int REQUEST_CODE=1; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); btn=(Button)findViewById(R.id.btn1); btn.setOnClickListener(listener); } private OnClickListener listener=new OnClickListener() { @Override public void onClick(View v) { // Intent intent=new Intent(); // intent.setAction(Intent.ACTION_SENDTO); // intent.setData(Uri.parse("smsto:5554")); // intent.putExtra("sms_body", "welcome to ...."); // startActivity(intent); Intent intent=new Intent(); intent.setClass(IntentActivity.this, second.class); intent.putExtra("str", "second demo"); //startActivity(intent); startActivityForResult(intent, REQUEST_CODE); } }; @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { if(requestCode==REQUEST_CODE){ // if(resultCode==send.RESULT_OK){....} switch (resultCode) { case second.RESULT_OK: Bundle b=data.getExtras(); String str=b.getString("str1"); break;
} super.onActivityResult(requestCode, resultCode, data); } }
activity2:
public class second extends Activity {
private TextView secondTxt; private Button btn; final static int RESULT_CODE=1; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.second); Intent intent=getIntent(); Bundle bundle=intent.getExtras(); String str =bundle.getString("str"); secondTxt=(TextView)findViewById(R.id.sencondTv1); secondTxt.setText(str); btn=(Button)findViewById(R.id.btnSecond); btn.setOnClickListener(listener); } private OnClickListener listener=new OnClickListener() { @Override public void onClick(View v) { Intent intent=new Intent(); intent.putExtra("back", "back data"); setResult(RESULT_CODE,intent); finish(); } }; }
有几个值得注意的地方:
1. activity相互传递是Intent
2. Bundle接受Intent 中putExtra进去的参数
3. startActivityForResult(intent, REQUEST_CODE);中的REQUEST_CODE必须大于或等于0才会调用继承activity的 onActivityResult方法,不然会调用startActivityFromChild(要重写)方法
protected void onActivityResult(int requestCode, int resultCode, Intent data)
requestCode就是REQUEST_CODE的值(必须大于或等于0)
resultCode是activity2中RESULT_CODE(测试貌似-1都可以)的值
Intent data是activity2传过来的值,用Bundle接受处理