(Android review) Open Activity and return results

(Android review) Open Activity and return results

I. Basic knowledge points

In fact, it is easy to complete this function:

1. MainActivity

StartActivityForResult (intent, 100); // The second is the request code.

@ Override
Protected void onActivityResult (int requestCode, int resultCode, Intent data ){
Super. onActivityResult (requestCode, resultCode, data );

If (data! = Null ){
If (resultCode = 200) {// can it be determined based on the request or the result code?

String username = data. getStringExtra ("username ");
Et_username.setText (username );
}
}
}

2. MainActivity2

SetResult (200, intent); // The first parameter is the return code.

Ii. Code

1. MainActivity

Package com. example. setresult; import android. OS. bundle; import android. app. activity; import android. content. intent; import android. view. menu; import android. view. view; import android. widget. editText; public class MainActivity extends Activity {public EditText et_username; @ Overrideprotected void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); setContentView (R. layout. main); et_userna Me = (EditText) findViewById (R. id. et_name);} public void get (View view) {Intent intent = new Intent (this, MainActivity2.class); startActivityForResult (intent, 100 ); // The second is the Request Code} @ Overrideprotected void onActivityResult (int requestCode, int resultCode, Intent data) {super. onActivityResult (requestCode, resultCode, data); if (data! = Null) {if (resultCode = 200) {// can be determined based on the request or the result code? String username = data. getStringExtra ("username"); et_username.setText (username) ;}}@ Overridepublic boolean onCreateOptionsMenu (Menu menu) {// Inflate the menu; this adds items to the action bar if it is present. getMenuInflater (). inflate (R. menu. main, menu); return true ;}}

2. MainActivity2

Package com. example. setresult; import android. app. activity; import android. content. intent; import android. graphics. color; import android. OS. bundle; import android. view. textureView; import android. view. view; import android. view. viewGroup; import android. widget. adapterView; import android. widget. adapterView. onItemClickListener; import android. widget. baseAdapter; import android. widget. listView; import android. widget. textView; public class MainActivity2 extends Activity {public ListView listView; public MyAdapter adapter; @ Overrideprotected void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); setContentView (R. layout. main2); listView = (ListView) findViewById (R. id. listview); adapter = new MyAdapter (); listView. setAdapter (adapter); listView. setOnItemClickListener (new MyOnItemClickListener ();} public class MyOnItemClickListener implements OnItemClickListener {@ Overridepublic void onItemClick (AdapterView
 Arg0, View arg1, int position, long arg3) {Intent intent = new Intent (getApplicationContext (), MainActivity. class); String username = (String) adapter. getItem (position); intent. putExtra ("username", username); setResult (200, intent); // The first parameter is the return code finish (); // end the current activity} public class MyAdapter extends BaseAdapter {String names [] = new String [] {"hjd", "hjd1", "hjd2 ", "hjd3", "hjd4"}; @ Overridepublic int getCount () {return names. length ;}@ Overridepublic Object getItem (int position) {return names [position] ;}@ Overridepublic long getItemId (int position) {return position ;}@ Overridepublic View getView (int position, view arg1, ViewGroup arg2) {TextView TV = new TextView (getApplicationContext (); TV. setText (names [position]); TV. setTextSize (25); TV. setTextColor (Color. GREEN); return TV ;}}}

3. Download source code

Http://download.csdn.net/detail/caihongshijie6/7793215

IV,