我试图做一个应用程序，在第一个活动中，用户可以标记几个复选框，从 1 到 7 或 8（这取决于最终版本）。当用户标记了他的选项并单击“搜索”按钮时，我想显示一个列表，根据标记的项目显示不同的对象。
我的对象是自定义对象“地面”，它有许多特征，如字符串或 int-boolean（1 或 0），存储在数据库 sqlite 中。在我的主要活动中，我使用了很多 if else 来了解检查了多少复选框，我通过 extras 将这些信息放入意图中，在我的第二个活动（列表）中，我检索了这个 extras，我做另一个 if else 知道应用程序必须显示什么列表。我认为这种方法非常初级，因为我必须在这两个活动上做很多 if else 。我试图在第一个活动中创建一个返回列表的 dbquery，并通过意图发送此列表，但我遵循了很多教程，并且总是有一个正确数量的对象列表，但总是相同的覆盖对象！
有什么想法吗？
先感谢您！
第一项活动
public class MainActivity extends Activity {
Button bafegeix, bcerca, bneteja;
ListView llista;
RadioGroup grup;
RadioButton casa, terreny;
CheckBox cbaigua, cblavabos, cbcobert, cbdutxes, cbcuina, cbadap;
protected Activity activity;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_prova__db);
bcerca = (Button) findViewById (R.id.cerca);
bneteja = (Button) findViewById (R.id.neteja);
grup = (RadioGroup)findViewById (R.id.grup);
casa = (RadioButton)findViewById (R.id.casa);
terreny = (RadioButton)findViewById (R.id.terreny);
cbaigua = (CheckBox)findViewById (R.id.aigua);
cblavabos = (CheckBox)findViewById (R.id.lavabos);
cbcobert = (CheckBox)findViewById (R.id.cobert);
cbdutxes = (CheckBox)findViewById (R.id.dutxes);
cbcuina = (CheckBox)findViewById (R.id.cuina);
cbadap = (CheckBox)findViewById (R.id.adaptada);
bcerca.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if(terreny.isChecked()){
Intent iterreny = new Intent(getApplicationContext(), LlistaTerrenys.class);
iterreny.putExtra("aigua", "aigua");
iterreny.putExtra("lavabos", "lavabos");
iterreny.putExtra("cobert", "cobert");
iterreny.putExtra("dutxes", "dutxes");
startActivity(iterreny);
}else if (cbaigua.isChecked()&& cblavabos.isChecked()&&cbcobert.isChecked()&&cbdutxes.isChecked()) {
Intent iterreny = new Intent(getApplicationContext(), LlistaTerrenys.class);
iterreny.putExtra("aigua", "aigua");
iterreny.putExtra("lavabos", "lavabos");
iterreny.putExtra("cobert","cobert");
iterreny.putExtra("dutxes", "dutxes");
startActivity(iterreny);
} else if(cbaigua.isChecked()&&cblavabos.isChecked()&&cbcobert.isChecked()){
Intent iterreny = new Intent(getApplicationContext(), LlistaTerrenys.class);
iterreny.putExtra("aigua", "aigua");
iterreny.putExtra("lavabos", "lavabos");
iterreny.putExtra("cobert","cobert");
startActivity(iterreny);
}else if(cblavabos.isChecked()&&cbcobert.isChecked()&&cbdutxes.isChecked()){
Intent iterreny2 = new Intent(getApplicationContext(), LlistaTerrenys.class);
iterreny.putExtra("lavabos", "lavabos");
iterreny.putExtra("cobert", "cobert");
iterreny.putExtra("dutxes", "dutxes");
startActivity(iterreny);
}else if(cbaigua.isChecked()&&cbcobert.isChecked()&&cbdutxes.isChecked()){
Intent iterreny2 = new Intent(getApplicationContext(), LlistaTerrenys.class);
iterreny.putExtra("aigua", "aigua");
iterreny.putExtra("cobert", "cobert");
iterreny.putExtra("dutxes", "dutxes");
startActivity(iterreny);
}else if(cbaigua.isChecked()&&cblavabos.isChecked()&&cbdutxes.isChecked()){
Intent iterreny2 = new Intent(getApplicationContext(), LlistaTerrenys.class);
iterreny.putExtra("aigua", "aigua");
iterreny.putExtra("lavabos", "lavabos");
iterreny.putExtra("dutxes", "dutxes");
startActivity(iterreny);
}else if (cbaigua.isChecked()&&cblavabos.isChecked()){
Intent iterreny2 = new Intent(getApplicationContext(), LlistaTerrenys.class);
iterreny.putExtra("aigua", "aigua");
iterreny.putExtra("lavabos", "lavabos");
startActivity(iterreny);
第二项活动
公共类 LlistaTerrenys 扩展 Activity {
ListView llista;
TextView numelements;
ArrayList<Terreny>list;
Context context;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.layout_list_contactos);
llista = (ListView)findViewById(R.id.listView1);
numelements = (TextView)findViewById(R.id.numelements);
Bundle extras = getIntent().getExtras();
String aigua = extras.getString("aigua");
String lavabos = extras.getString("lavabos");
String cobert = extras.getString("cobert");
String dutxes = extras.getString("dutxes");
String seleccio = extras.getString("noseleccio");
if (aigua!=null && lavabos!=null && cobert!=null && dutxes!=null) {
final UtilidadesSQL mydb = new UtilidadesSQL(getApplicationContext());
mydb.getAllDataTerrenyTotesCaracteristiques();
AdapterTerreny aa = new AdapterTerreny(this, mydb.getAllDataTerrenyTotesCaracteristiques());
llista.setAdapter(aa);
} else if(aigua!=null && lavabos!=null && cobert!=null){
final UtilidadesSQL mydb = new UtilidadesSQL(getApplicationContext());
AdapterTerreny aa = new AdapterTerreny(this, mydb.getAllDataTerrenyAiguaLavabosCobert());
llista.setAdapter(aa);
}else if(lavabos!=null && cobert!=null && dutxes!=null){
final UtilidadesSQL mydb = new UtilidadesSQL(getApplicationContext());
AdapterTerreny aa = new AdapterTerreny(this, mydb.getAllDataTerrenyLavabosCobertDutxes());
llista.setAdapter(aa);
}else if(aigua!=null && cobert!=null && dutxes!=null){
final UtilidadesSQL mydb = new UtilidadesSQL(getApplicationContext());
AdapterTerreny aa = new AdapterTerreny(this, mydb.getAllDataTerrenyAiguaCobertDutxes());
llista.setAdapter(aa);
}else if(aigua!=null && lavabos!=null && dutxes!=null){
final UtilidadesSQL mydb = new UtilidadesSQL(getApplicationContext());
AdapterTerreny aa = new AdapterTerreny(this, mydb.getAllDataTerrenyAiguaLavabosDutxes());
llista.setAdapter(aa);
}else if (aigua!=null && lavabos!=null ){
final UtilidadesSQL mydb = new UtilidadesSQL(getApplicationContext());
AdapterTerreny aa = new AdapterTerreny(this, mydb.getAllDataTerrenyAiguaLavabos());
llista.setAdapter(aa);
这里有不同的方法从 SQL 中检索数据
public Cursor getAllDataTerrenyAigua () {
SQLiteDatabase db = getReadableDatabase();
String buildSQL = ("select * from terrenys where aigua = ?");
return db.rawQuery(buildSQL, new String[]{"1"});
}
public Cursor getAllDataTerrenyLavabos () {
SQLiteDatabase db = getReadableDatabase();
String buildSQL = ("select * from terrenys where lavabos = ?");
return db.rawQuery(buildSQL, new String[]{"1"});
}
public Cursor getAllDataTerrenyCobert () {
SQLiteDatabase db = getReadableDatabase();
String buildSQL = ("select * from terrenys where cobert = ?");
return db.rawQuery(buildSQL, new String[]{"1"});
}
public Cursor getAllDataTerrenyDutxes () {
SQLiteDatabase db = getReadableDatabase();
String buildSQL = ("select * from terrenys where dutxes = ?");
return db.rawQuery(buildSQL, new String[]{"1"});
}
public Cursor getAllDataTerrenyTotesCaracteristiques () {
SQLiteDatabase db = getReadableDatabase();
String buildSQL = ("select * from terrenys where aigua=? AND cobert=? AND dutxes=? AND lavabos=?");
return db.rawQuery(buildSQL, new String[]{"1","1","1","1"});
}