我曾經用iOS語言進行編程,每個UIView類都有自己的UIViewController類來管理/填充視圖本身。我正在嘗試編寫一個簡單的android應用程序,它從url解析JSONArray,然後填充四個視圖,但我不知道如何爲每個視圖實現一個類,並將它們的字符串參數傳遞給它們以填充它們。你能告訴我什麼是實現應用邏輯的最佳方式?我有swipable-tabs的新項目,然後我必須使用碎片。這些片段是否與iOS中的UIView相同?請幫幫我。在android中填充/管理視圖的更好方法?
我這樣做了,我想知道它是否正確。我創建了一個帶有空白活動的新項目,並以導航類型的形式創建了「可滾動選項卡+輕掃」。
我的主要活動:
公共類MyMainActvity擴展FragmentActivity {
private static String url = "http://www.myurl.it";
static JSONObject jObj = null;
/**
* The {@link android.support.v4.view.PagerAdapter} that will provide
* fragments for each of the sections. We use a
* {@link android.support.v4.app.FragmentPagerAdapter} derivative, which
* will keep every loaded fragment in memory. If this becomes too memory
* intensive, it may be best to switch to a
* {@link android.support.v4.app.FragmentStatePagerAdapter}.
*/
SectionsPagerAdapter mSectionsPagerAdapter;
/**
* The {@link ViewPager} that will host the section contents.
*/
ViewPager mViewPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_activity);
new JSONParse().execute();
// Create the adapter that will return a fragment for each of the three
// primary sections of the app.
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main_activity, menu);
return true;
}
/**
* A {@link FragmentPagerAdapter} that returns a fragment corresponding to
* one of the sections/tabs/pages.
*/
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
// getItem is called to instantiate the fragment for the given page.
// Return a DummySectionFragment (defined as a static inner class
// below) with the page number as its lone argument.
switch (position) {
case 0:
{
HomeSection homeFrag= new HomeSection();
homeFrag.newInstance(jObj);
return homeFrag;
}
case 1:
{
ServiceSection servFrag= new ServiceSection();
servFrag.newInstance(jObj);
return servFrag;
}
case 2:
{
Fragment fragment = new DummySectionFragment();
Bundle args = new Bundle();
args.putInt(DummySectionFragment.ARG_SECTION_NUMBER, position + 1);
fragment.setArguments(args);
return fragment;
}
case 3:
{
Fragment fragment = new DummySectionFragment();
Bundle args = new Bundle();
args.putInt(DummySectionFragment.ARG_SECTION_NUMBER, position + 1);
fragment.setArguments(args);
return fragment;
}
}
return null;
}
@Override
public int getCount() {
// Show 4 total pages.
return 4;
}
@Override
public CharSequence getPageTitle(int position) {
Locale l = Locale.getDefault();
switch (position) {
case 0:
return getString(R.string.title_section1).toUpperCase(l);
case 1:
return getString(R.string.title_section2).toUpperCase(l);
case 2:
return getString(R.string.title_section3).toUpperCase(l);
case 3:
return getString(R.string.title_section4).toUpperCase(l);
}
return null;
}
}
/**
* A dummy fragment representing a section of the app, but that simply
* displays dummy text.
*/
public static class DummySectionFragment extends Fragment {
/**
* The fragment argument representing the section number for this
* fragment.
*/
public static final String ARG_SECTION_NUMBER = "section_number";
public DummySectionFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(
R.layout.fragment_dummy, container, false);
TextView dummyTextView = (TextView) rootView
.findViewById(R.id.section_label);
dummyTextView.setText(Integer.toString(getArguments().getInt(
ARG_SECTION_NUMBER)));
return rootView;
}
}
private class JSONParse extends AsyncTask<String, String, JSONArray> {
private ProgressDialog pDialog;
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(MyMainActivity.this);
pDialog.setMessage("Getting Data ...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
@Override
protected JSONArray doInBackground(String... args) {
JSONParser jParser= new JSONParser();
JSONArray json =jParser.getJSONFromUrl(url);
return json;
}
@Override
protected void onPostExecute(JSONArray json) {
pDialog.dismiss();
Log.d("JSONARRAY:", json.toString());
try {
JSONObject json_data = json.getJSONObject(0);
jObj= json_data;
mSectionsPagerAdapter = new SectionsPagerAdapter(
getSupportFragmentManager());
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mSectionsPagerAdapter);
}
catch(JSONException exception) {
Log.e("ERROR", exception.getMessage());
}
}
}
}
這是一個我的一個子類片段:
公共類HomeSection擴展片段{
JSONObject _jObj;
public HomeSection(){}
public void newInstance(JSONObject jObj) {
Bundle args = new Bundle();
_jObj= jObj;
try{
String content= _jObj.getString("descrizione");
args.putString("description", content);
}
catch(JSONException exception){
Log.e("ERROR JSON HOME", exception.getMessage());
}
// Put any other arguments
this.setArguments(args);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(
R.layout.fragment_dummy, container, false);
TextView dummyTextView = (TextView) rootView
.findViewById(R.id.section_label);
try {
dummyTextView.setText(_jObj.getString("descrizione"));
}
catch(JSONException exception){
Log.e("ERROR JSON HOME", exception.getMessage());
}
return rootView;
}
}
它的工作原理,但我想如果它是一種正確的方式填充我的應用程序中的意見。然後我不知道如果在HomeSection類中,我在「newIstance」方法中創建的Bundle是非常有必要的,因爲我在方法onCreateView中的視圖中設置了我的文本。請問你能幫幫我嗎?謝謝
我編輯我的問題,如果你可以看看,並告訴我你的意見,我會很高興 – user3107388
我建議你把你的問題的第二部分,使之成爲新的問題來代替。這樣它就會達到目的,你會得到更好的答案。保持原來的問題原樣。 –