Android Example: a simple login program

Recently wrote a simple landing procedure, there are a few gains:

1. Know how to nest linearlayout in LinearLayout, perfect the ranks of the layout;

2. Use Android:layout_weight to control the weight of the control;

3. Use GetText () to obtain edittext content;

4. Familiar with the writing of the control, no longer follow the book copy =.=

The code is as follows:

Loginactivity.java

ImportAndroid.os.Bundle;Importandroid.app.Activity;Importandroid.content.Intent;ImportAndroid.view.Menu;ImportAndroid.view.View;ImportAndroid.view.View.OnClickListener;ImportAndroid.widget.Button;ImportAndroid.widget.EditText;ImportAndroid.widget.Toast; Public classLoginactivityextendsActivity {Privatebutton button; PrivateEditText EditText1; PrivateEditText editText2; @Overrideprotected voidonCreate (Bundle savedinstancestate) {Super. OnCreate (savedinstancestate);        Setcontentview (R.layout.login); //loading controls such as buttons and file boxesbutton=(Button) Findviewbyid (R.id.button); EditText1=(EditText) Findviewbyid (R.id.input_account); EditText2=(EditText) Findviewbyid (R.id.input_password); Button.setonclicklistener (NewOnclicklistener () { Public voidOnClick (View v) {//get the text content of the EditText and delete the spaceString inputaccount=Edittext1.gettext (). toString (). Trim (); String Inputpassword=Edittext2.gettext (). toString (). Trim (); //If the account password is "123", jump to the activity                    if(Inputaccount.equals ("123") && Inputpassword.equals ("123") {toast.maketext (loginactivity). This, "The account password is correct, is logged in", Toast.length_short). Show (); Intent Intent=NewIntent (loginactivity. This, Mainactivity.class);                    StartActivity (Intent); }Else{toast.maketext (loginactivity). This, "The account or password is not correct, please re-enter", Toast.length_short). Show ();            }            }        }); } @Override Public BooleanOncreateoptionsmenu (Menu menu) {//inflate the menu; This adds items to the action bar if it is present.getmenuinflater (). Inflate (r.menu.setting, menu); return true; }    }

Loginactivity.java

Mainactivity.java

ImportAndroid.os.Bundle;Importandroid.app.Activity;ImportAndroid.view.Menu; Public classMainactivityextendsActivity {@Overrideprotected voidonCreate (Bundle savedinstancestate) {Super. OnCreate (savedinstancestate);    Setcontentview (R.layout.activity_main); } @Override Public BooleanOncreateoptionsmenu (Menu menu) {//inflate the menu; This adds items to the action bar if it is present.getmenuinflater (). Inflate (r.menu.setting, menu); return true; }    }

Mainactivity.java

Login.xml

<LinearLayoutxmlns:android= "Http://schemas.android.com/apk/res/android"Xmlns:tools= "Http://schemas.android.com/tools"Android:layout_width= "Match_parent"Android:layout_height= "Match_parent"Android:paddingbottom= "@dimen/activity_vertical_margin"Android:paddingleft= "@dimen/activity_horizontal_margin"Android:paddingright= "@dimen/activity_horizontal_margin"Android:paddingtop= "@dimen/activity_vertical_margin"Tools:context=". Loginactivity "android:orientation= "vertical"    >        <LinearLayoutandroid:orientation= "Horizontal"Android:layout_width= "Match_parent"Android:layout_height= "Wrap_content"            >                        <TextViewAndroid:id= "@+id/account"Android:layout_width= "Wrap_content"Android:layout_height= "Wrap_content"Android:text= "account Number:"    />           <EditTextAndroid:id= "@+id/input_account"Android:layout_width= "Wrap_content"Android:layout_height= "Wrap_content"Android:hint= "Input your account"Android:layout_weight= "1" >                        </EditText>             </LinearLayout>              <LinearLayoutAndroid:layout_width= "Match_parent"Android:layout_height= "Wrap_content"android:orientation= "Horizontal">           <TextViewAndroid:id= "@+id/password"Android:layout_width= "Wrap_content"Android:layout_height= "Wrap_content"Android:text= "Password:"        />        <EditTextAndroid:id= "@+id/input_password"Android:layout_width= "Wrap_content"Android:layout_height= "Wrap_content"Android:hint= "Input Your password"Android:layout_weight= "1"      />      </LinearLayout>        <LinearLayoutAndroid:layout_width= "Match_parent"Android:layout_height= "Wrap_content"android:orientation= "Horizontal">            <ButtonAndroid:id= "@+id/button"Android:layout_width= "Match_parent"Android:layout_height= "Wrap_content"Android:text= "Login" />                    </LinearLayout></LinearLayout>

Login.xml

Activity_main.xml

<Relativelayoutxmlns:android= "Http://schemas.android.com/apk/res/android"Xmlns:tools= "Http://schemas.android.com/tools"Android:layout_width= "Match_parent"Android:layout_height= "Match_parent"Android:paddingbottom= "@dimen/activity_vertical_margin"Android:paddingleft= "@dimen/activity_horizontal_margin"Android:paddingright= "@dimen/activity_horizontal_margin"Android:paddingtop= "@dimen/activity_vertical_margin"Tools:context=". Mainactivity " >    <TextViewAndroid:layout_width= "Wrap_content"Android:layout_height= "Wrap_content"Android:text= "Successful landing!" Sprinkle flower ~ " /></Relativelayout>

Activity_main.xml

Registering activity in Androidmanifest.xml

<?XML version= "1.0" encoding= "Utf-8"?><Manifestxmlns:android= "Http://schemas.android.com/apk/res/android" Package= "Com.example.logindemo"Android:versioncode= "1"Android:versionname= "1.0" >    <USES-SDKandroid:minsdkversion= "8"android:targetsdkversion= "+" />    <ApplicationAndroid:allowbackup= "true"Android:icon= "@drawable/ic_launcher"Android:label= "@string/app_name"Android:theme= "@style/apptheme" >        <ActivityAndroid:name= "Com.example.logindemo.LoginActivity"Android:label= "@string/app_name" >            <Intent-filter>                <ActionAndroid:name= "Android.intent.action.MAIN" />                <categoryAndroid:name= "Android.intent.category.LAUNCHER" />            </Intent-filter>        </Activity>                <ActivityAndroid:name= "Com.example.logindemo.MainActivity" >         </Activity>    </Application></Manifest>

Androidmanifest.xml

The results are as follows:

The account password is entered "123", you can successfully login. Happy ^_^

Android Example: a simple login program