我正在构建一个包含listview的应用。我想要完成的是当我点击listview中的每个唯一项时，每个项目将设置一个特定的Java类。我把我希望能够在Java包中选择的所有Java类放在一起，但我也在考虑将它们与其他java类一起使用。为了给出一些上下文，每个Java类都设置一个特定的xml文件。我不能只设置xml文件的原因是因为它需要java才能运行。需要考虑的一件事是，除了我的适配器类，主要活动和所选的其他java类之外，还需要忽略多个Java类。
这是MainActivity。我正在使用if语句：if (item_position==1) {then set a particular java class}. if (item_position==2) {then set another java class}.问题是我无法找出并找出放在括号内的内容来设置Java类。
public class MainActivity extends AppCompatActivity {
ArrayList<String> selectedItems;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
selectedItems = new ArrayList<String>();
ListView chl = (ListView) findViewById(R.id.fruitelector);
chl.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
String[] items = {"Apple", "Pear", "Banana", "Melon", "Grape", "Blueberry"};
Adapter adapter=new Adapter(this,items);
chl.setAdapter(adapter);
chl.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
int item_position=i;
if (item_position==1){
////set a particular Java class
}
if (item_position==2){
///set another particular java class
}
Toast.makeText(MainActivity.this, "Item position "+item_position+" clicked", Toast.LENGTH_SHORT).show();
以下是我尝试选择的其中一个Java类的示例。我也愿意设置xml类，我在其中一个Java类而不是MainActivity中选择了该项。
@Override
public View onCreateInputView() {
kv = (KeyboardView) getLayoutInflater().inflate(R.layout.keyboard, null);
keyboard = new Keyboard(this, R.xml.qwerty);
kv.setKeyboard(keyboard);
kv.setOnKeyboardActionListener(this);
return kv;
}
private void playClick(int keyCode) {
AudioManager am = (AudioManager) getSystemService(AUDIO_SERVICE);
switch (keyCode) {
case 32:
am.playSoundEffect(AudioManager.FX_KEYPRESS_SPACEBAR);
break;
case Keyboard.KEYCODE_DONE:
case 10:
am.playSoundEffect(AudioManager.FX_KEYPRESS_RETURN);
break;
case Keyboard.KEYCODE_DELETE:
am.playSoundEffect(AudioManager.FX_KEYPRESS_DELETE);
break;
default:
am.playSoundEffect(AudioManager.FX_KEYPRESS_STANDARD);
}
}
@Override
public void onPress(int primaryCode) {
}
@Override
public void onRelease(int primaryCode) {
}
@Override
public void onKey(int primaryCode, int[] keyCodes) {
InputConnection ic = getCurrentInputConnection();
playClick(primaryCode);
switch (primaryCode) {
case Keyboard.KEYCODE_DELETE:
ic.deleteSurroundingText(1, 0);
break;
case Keyboard.KEYCODE_SHIFT:
caps = !caps;
keyboard.setShifted(caps);
kv.invalidateAllKeys();
break;
case Keyboard.KEYCODE_DONE:
ic.sendKeyEvent(new KeyEvent(KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_ENTER));
break;
default:
char code = (char) primaryCode;
if (Character.isLetter(code) && caps) {
code = Character.toUpperCase(code);
}
ic.commitText(String.valueOf(code), 1);
}
}
@Override
public void onText(CharSequence text) {
}
@Override
public void swipeLeft() {
}
@Override
public void swipeRight() {
}
@Override
public void swipeDown() {
}
@Override
public void swipeUp() {
}