安卓學習之SQLite+ListView完成一個通訊錄
阿新 • • 發佈：2019-01-09
activity_main.xml 含有ListView佈局
user_item.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" xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="match_parent" tools:context="com.example.sqlite.MainActivity"> <ListView android:id="@+id/user_list" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentTop="true" android:layout_alignParentBottom="true" android:layout_alignParentLeft="true" android:layout_alignParentStart="true" android:layout_marginBottom="50dp" /> <LinearLayout android:id="@+id/bottom" android:layout_width="match_parent" android:layout_height="50dp" android:layout_alignParentBottom="true" android:layout_alignParentLeft="true" android:layout_alignParentStart="true"> <Button android:id="@+id/addUser" android:text="新增聯絡人" android:textSize="18dp" android:layout_weight="1" android:layout_width="match_parent" android:layout_height="match_parent" /> <Button android:id="@+id/searchUser" android:text="查詢聯絡人" android:textSize="18dp" android:layout_weight="1" android:layout_width="match_parent" android:layout_height="match_parent" /> </LinearLayout> </RelativeLayout>
MainActivity.java Main活動，顯示聯絡人ListView,各種點選事件操作<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent"> <ImageView android:id="@+id/user_img" android:layout_marginLeft="10dp" android:layout_width="wrap_content" android:layout_height="wrap_content" /> <TextView android:id="@+id/user_name" android:textSize="18dp" android:layout_marginLeft="10dp" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_toRightOf="@+id/user_img"/> <TextView android:id="@+id/telnumber" android:layout_marginTop="15dp" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@+id/user_name" android:layout_alignLeft="@+id/user_name" android:layout_alignStart="@+id/user_name"/> </RelativeLayout>
User.java 聯絡人類public class MainActivity extends AppCompatActivity implements View.OnClickListener{ private MyDatabaseHelper dbHelper; private List<User> UserList = new ArrayList<>(); private Button addUser; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); addUser = (Button) findViewById(R.id.addUser); addUser.setOnClickListener(this); dbHelper = new MyDatabaseHelper(this,"User.db",null,1); //初始化資料 initUser(); UserAdapter adapter = new UserAdapter(MainActivity.this, R.layout.user_item,UserList); ListView listView = (ListView) findViewById(R.id.user_list); listView.setAdapter(adapter); listView.setOnItemClickListener(new AdapterView.OnItemClickListener(){ @Override public void onItemClick(AdapterView<?> parent,View view, int position,long id){ User user = UserList.get(position); String name = user.getName(); String telnumber = user.getTelnumber(); Intent intent = new Intent(MainActivity.this,UserActivity.class); intent.putExtra("name",name); intent.putExtra("telnumber",telnumber); startActivity(intent); } }); } private void initUser(){ SQLiteDatabase db = dbHelper.getWritableDatabase(); Cursor cursor = db.query("User",null,null,null,null,null,null); if(cursor.moveToFirst()){ do{ //遍歷 String name = cursor.getString(cursor.getColumnIndex("name")); String telnumber = cursor.getString(cursor.getColumnIndex("telnumber")); User user = new User(name,telnumber,R.mipmap.ic_launcher); UserList.add(user); }while(cursor.moveToNext()); } cursor.close(); } @Override public void onClick(View view) { switch (view.getId()){ case R.id.addUser:{ Intent intent = new Intent(MainActivity.this,AddUserActivity.class); startActivity(intent); this.finish(); } break; } } }
public class User {
private int imgId;
private String name;
private String telnumber;
public User(String name,String telnumber,int imgId){
this.name = name;
this.telnumber = telnumber;
this.imgId = imgId;
}
public int getImgId(){
return imgId;
}
public String getName(){
return name;
}
public String getTelnumber(){
return telnumber;
}
}public class UserAdapter extends ArrayAdapter<User>{
private int resourceId;
public UserAdapter(Context context, int textViewResourceId,List<User> objects){
super(context,textViewResourceId,objects);
resourceId = textViewResourceId;
}
@Override
public View getView(int position,View converView,ViewGroup parent){
User user = getItem(position);//獲取當前User例項
View view = LayoutInflater.from(getContext()).inflate(resourceId,parent,false);
ImageView userimg = (ImageView) view.findViewById(R.id.user_img);
TextView username = (TextView) view.findViewById(R.id.user_name);
TextView telphone = (TextView) view.findViewById(R.id.telnumber);
userimg.setImageResource(user.getImgId());
username.setText(user.getName());
telphone.setText(user.getTelnumber());
return view;
}
}public class AddUserActivity extends AppCompatActivity implements View.OnClickListener{
private MyDatabaseHelper dbHelper;
private EditText username,telnumber;
private Button ok_add,create_database;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_add_user);
dbHelper = new MyDatabaseHelper(this,"User.db",null,1);
username = (EditText) findViewById(R.id.add_user_name);
telnumber = (EditText) findViewById(R.id.add_user_telnumber);
ok_add = (Button) findViewById(R.id.ok_add);
ok_add.setOnClickListener(this);
create_database = (Button) findViewById(R.id.create_database);
create_database.setOnClickListener(this);
}
@Override
public void onClick(View view) {
switch (view.getId()){
case R.id.create_database:{
dbHelper.getWritableDatabase();
}
break;
case R.id.ok_add:{
String name = username.getText().toString();
String tel_number = telnumber.getText().toString();
if(name == null || tel_number == null){
Toast.makeText(this,"使用者名稱和電話不能為空！",Toast.LENGTH_SHORT).show();
}else{
SQLiteDatabase db = dbHelper.getWritableDatabase();
ContentValues values = new ContentValues();
values.put("name",name);
values.put("telnumber",tel_number);
db.insert("User",null,values);
values.clear();
Toast.makeText(this,"新增成功!",Toast.LENGTH_SHORT).show();
Intent intent = new Intent(AddUserActivity.this,MainActivity.class);
startActivity(intent);
this.finish();
}
}
}
}
}public class MyDatabaseHelper extends SQLiteOpenHelper{
public static final String Create_User_Table = "create table User ("
+ "id integer primary key autoincrement,"
+ "name text,"
+ "telnumber text)";
private Context mContext;
public MyDatabaseHelper(Context context,String name,SQLiteDatabase.CursorFactory factory,
int version){
super(context,name,factory,version);
mContext = context;
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL(Create_User_Table);
Toast.makeText(mContext,"建立成功",Toast.LENGTH_SHORT).show();
}
@Override
public void onUpgrade(SQLiteDatabase sqLiteDatabase, int i, int i1) {
}
}public class UserActivity extends AppCompatActivity {
private TextView name,telnumber;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_user);
name = (TextView) findViewById(R.id.text_name);
telnumber = (TextView) findViewById(R.id.text_number);
Intent intent = getIntent();
String user_name = intent.getStringExtra("name");
name.setText(user_name);
String telephone = intent.getStringExtra("telnumber");
telnumber.setText(telephone);
}
}<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.sqlite.AddUserActivity">
<EditText
android:id="@+id/add_user_name"
android:hint="姓名"
android:layout_marginTop="20dp"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<EditText
android:id="@+id/add_user_telnumber"
android:hint="電話號碼"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/add_user_name"/>
<Button
android:id="@+id/ok_add"
android:text="新增"
android:textSize="18dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/add_user_telnumber"/>
<Button
android:id="@+id/create_database"
android:text="建立資料庫"
android:textSize="18dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/ok_add"/>
</RelativeLayout>
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.sqlite.UserActivity">
<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="92dp"
android:text="姓名"
android:textSize="20dp"
android:layout_marginLeft="70dp"
android:layout_marginStart="39dp"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignEnd="@+id/textView"
android:layout_alignRight="@+id/textView"
android:layout_below="@+id/textView"
android:layout_marginTop="29dp"
android:text="電話"
android:textSize="20dp"/>
<TextView
android:id="@+id/text_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignTop="@+id/textView"
android:layout_marginLeft="49dp"
android:layout_marginStart="49dp"
android:layout_toEndOf="@+id/textView"
android:layout_toRightOf="@+id/textView"
android:textSize="20dp"/>
<TextView
android:id="@+id/text_number"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/textView2"
android:layout_alignStart="@+id/text_name"
android:layout_alignLeft="@+id/text_name"
android:layout_alignRight="@+id/text_name"
android:textSize="20dp"/>
</RelativeLayout>