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我想比較微調整數類型列表和位置。整數列表包含來自數據庫的ID列表，並且微調器包含關於ID的名稱列表。將ID和名稱存儲在數據庫中，比較列表中的ID和微調器的位置後，將兩個編輯文本框設置爲與名稱以外的特定ID對應的值。 該ID設置爲自動增量。 這裏是在MainActivity：不兼容的操作數類型r.integer和int
public class LoginActivity extends AppCompatActivity {
Button b;
EditText ed1, ed2, ed3;
Spinner sp;
String url = "https://web.facebook.com/";
String urltest = "http://www.google.com/";
WebView wb;
database db;
String details[];
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
b = (Button) findViewById(R.id.button1);
ed1 = (EditText) findViewById(R.id.editText1);
ed2 = (EditText) findViewById(R.id.editText2);
ed3 = (EditText) findViewById(R.id.editText3);
wb = (WebView) findViewById(R.id.webView1);
sp = (Spinner) findViewById(R.id.spinner1);
db = new database(LoginActivity.this);
// wb.loadUrl(url);
List<String> l = db.userlist();
final List<Integer> idlist = db.IDList();
ArrayAdapter<String> sa = new ArrayAdapter<String>(LoginActivity.this, android.R.layout.simple_spinner_item, l);
sp.setAdapter(sa);
b.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
user u = new user();
String name = ed1.getText().toString();
String uname = ed2.getText().toString();
String pass = ed3.getText().toString();
if (name.length() > 0 && uname.length() > 0 && pass.length() > 0) {
u.setName(name);
u.setUname(uname);
u.setPass(pass);
db.insert(u);
ed1.setText("");
ed2.setText("");
ed3.setText("");
} else {
Toast.makeText(LoginActivity.this, "Please enter the Name, User Name and password",
Toast.LENGTH_SHORT).show();
}
Toast.makeText(LoginActivity.this, "The user name details has been saved.", Toast.LENGTH_LONG).show();
}
});
sp.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
// TODO Auto-generated method stub
if (idlist.get(position) == position) {
details = db.details(position);
ed2.setText(details[0]);
ed3.setText(details[1]);
}
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
// TODO Auto-generated method stub
}
});
}
}
我創建了其它兩個Java文件作爲database.java它創建數據庫，並返回：
public class database extends SQLiteOpenHelper {
public static String dbname = "Personal";
public static int version = 1;
public static String tblname = "Data";
public static String id = "ID";
public static String name = "Name";
public static String uname = "Username";
public static String pass = "Password";
public database(Context context) {
super(context, dbname, null, version);
// TODO Auto-generated constructor stub
}
@Override
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
String sql1 = "create table " + tblname + " (" + id + " integer primary key autoincrement, " + name + " text, "
+ uname + " text, " + pass + " text)";
db.execSQL(sql1);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
}
void insert(user u) {
SQLiteDatabase db = getWritableDatabase();
ContentValues values = new ContentValues();
values.put(name, u.getName());
values.put(uname, u.getUname());
values.put(pass, u.getPass());
db.insert(tblname, id, values);
}
public List<String> userlist() {
List<String> list = new ArrayList<String>();
SQLiteDatabase db = getReadableDatabase();
Cursor cursor = db.query(tblname, new String[] { name }, null, null, null, null, null);
while (cursor.moveToNext()) {
String data = cursor.getString(0);
list.add(data);
// Log.e("1", data);
}
return list;
}
public List<integer> IDList() {
List<integer> idlist = new ArrayList<integer>();
SQLiteDatabase db = getReadableDatabase();
Cursor cursor = db.query(tblname, new String[] { id }, null, null, null, null, null);
while (cursor.moveToNext()) {
String data = cursor.getString(0);
idlist.add(Integer.parseInt(data), null);
}
return idlist;
}
public String[] details(int position) {
String username = null, password=null;
SQLiteDatabase db = getReadableDatabase();
Cursor cursor = db.query(tblname, new String[] { id, uname, pass }, null, null, null, null, null);
while (cursor.moveToNext()) {
if (position == cursor.getInt(0)) {
username = cursor.getString(1);
password = cursor.getString(2);
} else {
return null;
}
}
return new String[] {username, password};
}
}
和user.java得到和設置細節：
public class user {
String id, name, uname, pass;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getUname() {
return uname;
}
public void setUname(String uname) {
this.uname = uname;
}
public String getPass() {
return pass;
}
public void setPass(String pass) {
this.pass = pass;
}
}
我在中收到錯誤文件爲incompatible operand types r.integer and int。這就行了if(idlist.get(position)==position) ----它是在項目選定偵聽器上的微調器上，現在通過將整數更改爲整數來解決該問題。但是這個聲明有些無效。它不能比較整型和整型。任何建議糾正它？
是你的代碼編譯？ Normaly'Integer'以大寫'i'開頭，還是不是'java.util.Integer'？ – Jens
@Jens - 我猜這是編譯好，android有一個描述int資源的'integer'類。但是，這只是猜測 – 0X0nosugar
由於操作數類型不兼容導致錯誤，但將整數轉換爲整數是有用的。謝謝。 –