Android Studio实现简单的通讯录
程序员文章站
2022-06-25 20:38:28
网上找的一个单页面通讯录,修改之后将添加联系人和修改/删除联系人分为两个独立页面mainactivitypackage com.example.test; import androidx.appcom...
网上找的一个单页面通讯录,修改之后将添加联系人和修改/删除联系人分为两个独立页面
mainactivity
package com.example.test; import androidx.appcompat.app.appcompatactivity; import android.content.context; import android.content.intent; import android.os.bundle; import android.database.cursor; import android.database.sqlite.sqlitedatabase; import android.text.method.scrollingmovementmethod; import android.view.view; import android.view.inputmethod.inputmethodmanager; import android.widget.button; import android.widget.edittext; import android.widget.textview; import android.widget.toast; public class mainactivity extends appcompatactivity implements view.onclicklistener{ myhelper myhelper; private textview tvshow; private button btnadd; private button btnquery; private button btnupdate; @override protected void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.activity_main); myhelper = new myhelper(this); init(); } private void init(){ tvshow = (textview)findviewbyid(r.id.tv_show); btnadd = (button)findviewbyid(r.id.btn_add); btnquery = (button)findviewbyid(r.id.btn_query); btnupdate = (button)findviewbyid(r.id.btn_update); btnadd.setonclicklistener(this); //button控件设置监听 btnquery.setonclicklistener(this); btnupdate.setonclicklistener(this); findviewbyid(r.id.traceroute_rootview).setonclicklistener(this); tvshow.setmovementmethod(scrollingmovementmethod.getinstance()); //设置文本滚动 } public void onclick(view v){ sqlitedatabase db; switch (v.getid()){ case r.id.traceroute_rootview: inputmethodmanager imm=(inputmethodmanager) getsystemservice(context.input_method_service); imm.hidesoftinputfromwindow(v.getwindowtoken(),0); break; case r.id.btn_add: //添加联系人 intent intent=new intent(mainactivity.this,nextactivity.class); startactivity(intent); break; case r.id.btn_query: //查询联系人 db = myhelper.getreadabledatabase(); cursor cursor = db.rawquery("select name,phone from person",null); if (cursor.getcount() == 0){ tvshow.settext(""); toast.maketext(this,"当前无联系人",toast.length_short).show(); }else { cursor.movetofirst(); tvshow.settext("name:" + cursor.getstring(0) + " ; tel:" + cursor.getstring(1)); while (cursor.movetonext()){ tvshow.append("\n" + "name:" + cursor.getstring(0) + " ; tel:" + cursor.getstring(1)); } } cursor.close(); db.close(); break; case r.id.btn_update: //修改联系人 intent intent1=new intent(mainactivity.this,xiugaiactivity.class); startactivity(intent1); break; } } }
nextactivity
package com.example.test; import androidx.appcompat.app.appcompatactivity; import android.content.context; import android.content.intent; import android.os.bundle; import android.database.sqlite.sqlitedatabase; import android.view.view; import android.view.inputmethod.inputmethodmanager; import android.widget.button; import android.widget.edittext; import android.widget.toast; public class nextactivity extends appcompatactivity implements view.onclicklistener { myhelper myhelper; private edittext etname; private edittext etphone; private button btnadd; @override protected void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.next); myhelper = new myhelper(this); init(); } private void init(){ etname = (edittext)findviewbyid(r.id.et_name); etphone = (edittext)findviewbyid(r.id.et_phone); btnadd = (button)findviewbyid(r.id.btn_add); btnadd.setonclicklistener(this); //button控件设置监听 findviewbyid(r.id.traceroute_rootview).setonclicklistener(this); } public void onclick(view v){ string name; string phone; sqlitedatabase db; switch (v.getid()) { case r.id.traceroute_rootview: inputmethodmanager imm = (inputmethodmanager) getsystemservice(context.input_method_service); imm.hidesoftinputfromwindow(v.getwindowtoken(), 0); break; case r.id.btn_add: //添加联系人 name = etname.gettext().tostring().trim(); phone = etphone.gettext().tostring().trim(); db = myhelper.getwritabledatabase(); if (name.equals("") || phone.equals("")) { //联系人信息不能为空 toast.maketext(this, "联系人信息添加失败", toast.length_short).show(); } else { db.execsql("insert into person (name,phone) values(?,?)", new object[]{name, phone}); toast.maketext(this, "联系人信息添加成功", toast.length_short).show(); } db.close(); intent intent=new intent(nextactivity.this,mainactivity.class); startactivity(intent); break; } } }
xiugaiactivity
package com.example.test; import androidx.appcompat.app.appcompatactivity; import android.content.context; import android.os.bundle; import android.database.cursor; import android.database.sqlite.sqlitedatabase; import android.text.method.scrollingmovementmethod; import android.view.view; import android.view.inputmethod.inputmethodmanager; import android.widget.button; import android.widget.edittext; import android.widget.textview; import android.widget.toast; public class xiugaiactivity extends appcompatactivity implements view.onclicklistener{ myhelper myhelper; private edittext etname; private edittext etphone; private textview tvshow; private button btnquery; private button btnupdate; private button btndelete; @override protected void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.xiugai); myhelper = new myhelper(this); init(); } private void init(){ etname = (edittext)findviewbyid(r.id.et_name); etphone = (edittext)findviewbyid(r.id.et_phone); tvshow = (textview)findviewbyid(r.id.tv_show); btnquery = (button)findviewbyid(r.id.btn_query); btnupdate = (button)findviewbyid(r.id.btn_update); btndelete = (button)findviewbyid(r.id.btn_delete); btnquery.setonclicklistener(this); btnupdate.setonclicklistener(this); btndelete.setonclicklistener(this); findviewbyid(r.id.traceroute_rootview).setonclicklistener(this); tvshow.setmovementmethod(scrollingmovementmethod.getinstance()); //设置文本滚动 } public void onclick(view v){ string name; string phone; sqlitedatabase db; switch (v.getid()){ case r.id.traceroute_rootview: inputmethodmanager imm=(inputmethodmanager) getsystemservice(context.input_method_service); imm.hidesoftinputfromwindow(v.getwindowtoken(),0); break; case r.id.btn_query: //查询联系人 db = myhelper.getreadabledatabase(); cursor cursor = db.rawquery("select name,phone from person",null); if (cursor.getcount() == 0){ tvshow.settext(""); toast.maketext(this,"当前无联系人",toast.length_short).show(); }else { cursor.movetofirst(); tvshow.settext("name:" + cursor.getstring(0) + " ; tel:" + cursor.getstring(1)); while (cursor.movetonext()){ tvshow.append("\n" + "name:" + cursor.getstring(0) + " ; tel:" + cursor.getstring(1)); } } cursor.close(); db.close(); break; case r.id.btn_update: //修改联系人 db = myhelper.getwritabledatabase(); name = etname.gettext().tostring().trim(); phone = etphone.gettext().tostring().trim(); if (name.equals("") || phone.equals("")){ //联系人信息不能为空 toast.maketext(this,"不存在该联系人",toast.length_short).show(); } else { db.execsql("update person set name=?,phone=? where name=?", new object[]{name, phone, name}); toast.maketext(this,"联系人信息修改成功",toast.length_short).show(); } db.close(); break; case r.id.btn_delete: //删除联系人 db = myhelper.getwritabledatabase(); name = etname.gettext().tostring().trim(); phone = etphone.gettext().tostring().trim(); if (name.equals("") || phone.equals("")){ //联系人信息不能为空 toast.maketext(this,"不存在该联系人",toast.length_short).show(); } else { db.execsql("delete from person where name=? and phone=?", new object[]{name, phone}); toast.maketext(this,"联系人信息删除成功",toast.length_short).show(); } db.close(); break; } } }
myhelper
package com.example.test; import android.content.context; import android.database.sqlite.sqlitedatabase; import android.database.sqlite.sqliteopenhelper; public class myhelper extends sqliteopenhelper{ public myhelper(context context){ super(context, "alan.db", null ,2); } @override public void oncreate(sqlitedatabase db){ db.execsql("create table person(id integer primary key autoincrement,name varchar(20),phone varchar(20) unique)"); } public void onupgrade(sqlitedatabase db, int oldversion, int newversion){ } }
activity_main.xml
<?xml version="1.0" encoding="utf-8"?> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent" android:id="@+id/traceroute_rootview" android:background="@color/white" android:clickable="true" android:gravity="center_horizontal" tools:context=".mainactivity"> <textview android:layout_width="match_parent" android:layout_height="wrap_content" android:text="通 讯 录" android:textsize="30dp" android:textstyle="italic" android:gravity="center" android:textcolor="@color/black"> </textview> <button android:id="@+id/btn_add" android:layout_width="match_parent" android:layout_height="wrap_content" android:background="@drawable/shape" android:text=" 添加联系人" android:textsize="16dp" android:textcolor="#c2c8ec" android:textstyle="bold"/> <button android:id="@+id/btn_query" android:layout_width="match_parent" android:layout_height="wrap_content" android:background="@drawable/shape" android:text="查看联系人" android:textsize="16dp" android:textcolor="#c2c8ec" android:textstyle="bold"/> <button android:id="@+id/btn_update" android:layout_width="match_parent" android:layout_height="wrap_content" android:background="@drawable/shape" android:text=" 修改联系人" android:textsize="16dp" android:textcolor="#c2c8ec" android:textstyle="bold"/> <textview android:id="@+id/tv_show" android:layout_width="match_parent" android:layout_height="180dp" android:scrollbars="vertical" android:layout_below="@+id/linefour" android:layout_margintop="20dp" android:layout_marginleft="20dp" android:layout_marginright="18dp" android:textcolor="#c2c8ec" android:textsize="24dp"/> </linearlayout>
next.xml
<?xml version="1.0" encoding="utf-8"?> <relativelayout xmlns: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:id="@+id/traceroute_rootview" android:background="@color/white" android:clickable="true" android:orientation="vertical" android:gravity="center_horizontal" tools:context=".nextactivity"> <linearlayout android:id="@+id/linetwo" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_below="@+id/lineone" android:layout_margintop="20dp" android:layout_marginleft="18dp" android:layout_marginright="18dp"> <textview android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="姓 名 : " android:textsize="18dp" android:textstyle="bold"/> <edittext android:id="@+id/et_name" android:layout_width="match_parent" android:layout_height="wrap_content" android:hint="请输入姓名" android:textsize="16dp" android:maxlines="1" android:singleline="true" android:maxlength="14"/> </linearlayout> <linearlayout android:id="@+id/linetree" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_below="@+id/linetwo" android:layout_margintop="10dp" android:layout_marginleft="18dp" android:layout_marginright="18dp"> <textview android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="电 话 : " android:textsize="18dp" android:textstyle="bold"/> <edittext android:id="@+id/et_phone" android:layout_width="match_parent" android:layout_height="wrap_content" android:hint="请输入手机号码" android:textsize="16dp" android:maxlines="1" android:singleline="true" android:maxlength="11"/> </linearlayout> <linearlayout android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/linefour" android:layout_below="@+id/linetree" android:layout_margintop="30dp" android:layout_marginleft="18dp" android:layout_marginright="18dp" android:orientation="horizontal"> <button android:id="@+id/btn_add" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="@drawable/shape" android:layout_weight="1" android:text=" 确 定 " android:textsize="16dp" android:textcolor="#c2c8ec" android:textstyle="bold"/> </linearlayout> </relativelayout> xiugai.xml <?xml version="1.0" encoding="utf-8"?> <relativelayout xmlns: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:id="@+id/traceroute_rootview" android:background="@color/white" android:clickable="true" android:orientation="vertical" android:gravity="center_horizontal" tools:context=".xiugaiactivity"> <linearlayout android:id="@+id/linetwo" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_below="@+id/lineone" android:layout_margintop="20dp" android:layout_marginleft="18dp" android:layout_marginright="18dp"> <textview android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="姓 名 : " android:textsize="18dp" android:textstyle="bold"/> <edittext android:id="@+id/et_name" android:layout_width="match_parent" android:layout_height="wrap_content" android:hint=" 请输入姓名" android:textsize="16dp" android:maxlines="1" android:singleline="true" android:maxlength="14"/> </linearlayout> <linearlayout android:id="@+id/linetree" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_below="@+id/linetwo" android:layout_margintop="10dp" android:layout_marginleft="18dp" android:layout_marginright="18dp"> <textview android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="电 话 : " android:textsize="18dp" android:textstyle="bold"/> <edittext android:id="@+id/et_phone" android:layout_width="match_parent" android:layout_height="wrap_content" android:hint=" 请输入手机号码" android:textsize="16dp" android:maxlines="1" android:singleline="true" android:maxlength="11"/> </linearlayout> <linearlayout android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/linefour" android:layout_below="@+id/linetree" android:layout_margintop="30dp" android:layout_marginleft="18dp" android:layout_marginright="18dp" android:orientation="horizontal"> <button android:id="@+id/btn_query" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="@drawable/shape" android:layout_weight="1" android:layout_marginleft="4dp" android:text="查看联系人" android:textsize="16dp" android:textcolor="#c2c8ec" android:textstyle="bold"/> <button android:id="@+id/btn_update" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="@drawable/shape" android:layout_weight="1" android:layout_marginleft="4dp" android:text=" 修 改 " android:textsize="16dp" android:textcolor="#c2c8ec" android:textstyle="bold"/> <button android:id="@+id/btn_delete" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="@drawable/shape" android:layout_weight="1" android:layout_marginleft="4dp" android:text=" 删 除 " android:textsize="16dp" android:textcolor="#c2c8ec" android:textstyle="bold"/> </linearlayout> <textview android:id="@+id/tv_show" android:layout_width="match_parent" android:layout_height="180dp" android:scrollbars="vertical" android:layout_below="@+id/linefour" android:layout_margintop="20dp" android:layout_marginleft="20dp" android:layout_marginright="18dp" android:textcolor="#c2c8ec" android:textsize="24dp"/> </relativelayout>
mainfest
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.test"> <application android:allowbackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundicon="@mipmap/ic_launcher_round" android:supportsrtl="true" android:theme="@style/theme.test"> <activity android:name=".mainactivity"> <intent-filter> <action android:name="android.intent.action.main" /> <category android:name="android.intent.category.launcher" /> </intent-filter> </activity> <activity android:name=".nextactivity"></activity> <activity android:name=".xiugaiactivity"></activity> </application> </manifest>
初学android,程序还存在许多bug,大家多提修改建议。
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持。