Data transfer between Android's different activity

1. Transfer Value activity

 PackageMydemo.mycom.demo2;Importandroid.content.Intent;Importandroid.support.v7.app.ActionBarActivity;ImportAndroid.os.Bundle;ImportAndroid.view.Menu;ImportAndroid.view.MenuItem;ImportAndroid.view.View;ImportAndroid.view.ViewGroup;ImportAndroid.widget.AdapterView;ImportAndroid.widget.BaseAdapter;ImportAndroid.widget.Button;ImportAndroid.widget.ListView;ImportAndroid.widget.TextView;ImportAndroid.widget.Toast;Importjava.util.List;ImportMydemo.mycom.demo2.dao.UserDao;ImportMydemo.mycom.demo2.entity.UserInfo; Public classHomeextendsActionbaractivityImplementsView.onclicklistener {PrivateListView LV; PrivateButton Btn_home_to_login; PrivateList<userinfo>list; @Overrideprotected voidonCreate (Bundle savedinstancestate) {Super. OnCreate (savedinstancestate);        Setcontentview (R.layout.activity_home); Btn_home_to_login=(Button) Findviewbyid (R.id.btn_home_to_login); LV=(ListView) Findviewbyid (r.id.lv); Btn_home_to_login.setonclicklistener ( This); Userdao DAO=NewUserdao ( This); List=Dao.findall (); Lv.setadapter (NewMyadapter ()); Lv.setonitemclicklistener (NewMyitemclicklistener ()); } @Override Public BooleanOncreateoptionsmenu (Menu menu) {getmenuinflater (). Inflate (r.menu.menu_home, menu); return true; } @Override Public Booleanonoptionsitemselected (MenuItem item) {intID =Item.getitemid (); if(id = =r.id.action_settings) {            return true; }        return Super. onoptionsitemselected (item); } @Override Public voidOnClick (view view) {Intent Intent=NewIntent (); Intent.setclass (Home. This, Register.class);    StartActivity (Intent); }     Public classMyadapterextendsBaseadapter { Public intGetCount () {returnlist.size (); } @Override PublicObject GetItem (inti) {return NULL; } @Override Public LongGetitemid (inti) {return0; } @Override PublicView GetView (intI, view view, ViewGroup ViewGroup) {UserInfo User=List.get (i); View Itemview= View.inflate (Home. This, R.layout.activity_item,NULL); TextView tv_id=(TextView) Itemview.findviewbyid (r.id.tv_id); TextView Tv_username=(TextView) Itemview.findviewbyid (r.id.tv_username); TextView Tv_password=(TextView) Itemview.findviewbyid (R.id.tv_password); Tv_id.settext (User.getid ()+"");            Tv_username.settext (User.getusername ());            Tv_password.settext (User.getpassword ()); returnItemview; }    }     Public classMyitemclicklistenerImplementsAdapterview.onitemclicklistener {@Override Public voidOnitemclick (adapterview<?> adapterview, view view,intILongl) {ListView LView=(ListView) LV; TextView tv_id=(TextView) View.findviewbyid (r.id.tv_id); TextView Tv_username=(TextView) View.findviewbyid (r.id.tv_username); TextView Tv_password=(TextView) View.findviewbyid (R.id.tv_password); String ID=Tv_id.gettext (). toString (); String username=Tv_username.gettext (). toString (); String Password=Tv_password.gettext (). toString (); Toast.maketext (Getapplicationcontext (), id+","+username, toast.length_short). Show (); //the value of the transfer between different activityIntent Intent =NewIntent (); Intent.putextra ("Username", username); Intent.putextra ("Password", password); Intent.putextra ("id", id); Intent.setclass (Home. This, Edit.class);        StartActivity (Intent); }    }}

2. Accept Activity

 PackageMydemo.mycom.demo2;Importandroid.content.Intent;Importandroid.support.v7.app.ActionBarActivity;ImportAndroid.os.Bundle;Importandroid.text.TextUtils;ImportAndroid.view.Menu;ImportAndroid.view.MenuItem;ImportAndroid.view.View;ImportAndroid.widget.Button;ImportAndroid.widget.EditText;ImportAndroid.widget.TextView;ImportAndroid.widget.Toast;ImportOrg.w3c.dom.Text;ImportMydemo.mycom.demo2.dao.UserDao; Public classEditextendsActionbaractivityImplementsView.onclicklistener {PrivateEditText Edit_et_username; PrivateEditText Edit_et_password; PrivateTextView edit_tv_id; PrivateButton Btn_edit; PrivateButton Btn_home; @Overrideprotected voidonCreate (Bundle savedinstancestate) {Super. OnCreate (savedinstancestate);        Setcontentview (R.layout.activity_edit); Edit_et_username=(EditText) Findviewbyid (r.id.edit_et_username); Edit_et_password=(EditText) Findviewbyid (R.id.edit_et_password); edit_tv_id=(TextView) Findviewbyid (r.id.edit_tv_id); Btn_edit=(Button) Findviewbyid (R.id.btn_edit); Btn_home=(Button) Findviewbyid (r.id.btn_home); Btn_edit.setonclicklistener ( This); Btn_home.setonclicklistener ( This); //accept the value that the activity passes overIntent Intent =getintent (); String username= Intent.getstringextra ("username"); String Password= Intent.getstringextra ("Password"); String ID= Intent.getstringextra ("id");        Edit_et_username.settext (username);        Edit_et_password.settext (password);    Edit_tv_id.settext (ID); } @Override Public BooleanOncreateoptionsmenu (Menu menu) {getmenuinflater (). Inflate (R.menu.menu_edit, menu); return true; } @Override Public Booleanonoptionsitemselected (MenuItem item) {intID =Item.getitemid (); if(id = =r.id.action_settings) {            return true; }        return Super. onoptionsitemselected (item); } @Override Public voidOnClick (view view) {Switch(View.getid ()) { Caser.id.btn_edit:string ID=Edit_tv_id.gettext (). toString (); String Password=Edit_et_password.gettext (). toString (). Trim (); String username=Edit_et_username.gettext (). toString (). Trim (); if(textutils.isempty (password) | |Textutils.isempty (username)) {Toast.maketext ( This, "The user name or password cannot be empty", Toast.length_short). Show (); return; } Userdao DAO=NewUserdao ( This); Booleanresult =Dao.findbyusername (username); if(Result) {Toast.maketext ( This, "User has been registered", Toast.length_short). Show (); return;                } dao.modify (Id,username,password); Toast.maketext ( This, "Modified successfully", Toast.length_short). Show (); Intent Intent=NewIntent (); Intent.setclass ( This, Home.class);                StartActivity (Intent);  Break;  Caser.id.btn_home:intent tointent=NewIntent (); Tointent.setclass ( This, Home.class);                StartActivity (tointent);  Break; }    }}

Data transfer between Android's different activity