[英]Create a class for “Next” & “Previous” method for Master-Detail view fragments
我想創建一個包含上一個和下一個按鈕的類。 該類將有助於減少我必須為每個類中的每個按鈕編寫的重復代碼的數量。 例如,在FirstPage.class片段內部調用以下代碼。
PageTransition.pageContents(CaseContent.getSize(),getArguments()。getString(ARG_ITEM_ID),button_next,button_prev);
下一個和上一個按鈕存儲在header.xml中,在每個布局中我都調用了它。 我為代碼使用了主從視圖。
我試圖為我的課程在CaseListActivity中使用相同的代碼。 但是,我有一個問題getSupportFragmentManager當我試圖把代碼添加到里面下一頁PageTransition()方法。
捆綁參數= new Bundle(); 片段片段; arguments.putString(FirstPage.ARG_ITEM_ID,id); 片段= new FirstPage(); fragment.setArguments(arguments); getSupportFragmentManager()。beginTransaction()
.replace(R.id.case_detail_container,片段).commit();
有沒有更好的方法來構造我的過渡班?
CaseListActivity.java
public class CaseListActivity extends AppCompatActivity {
....
//Method:- direct user to selected Item page
void onSelectedMenuItem(String id, View v) {
Bundle arguments = new Bundle();
Fragment fragment;
//in landscape
switch (id) {
case "1":
arguments.putString(FirstPage.ARG_ITEM_ID, id);
fragment = new FirstPage();
break;
... // case continues untill 12
break;
case "11":
arguments.putString(ElevethPage.ARG_ITEM_ID, id);
fragment = new ElevethPage();
break;
case "12":
arguments.putString(LastPage.ARG_ITEM_ID, id);
fragment = new LastPage();
break;
default:
arguments.putString(FirstPage.ARG_ITEM_ID, id);
fragment = new FirstPage();
break;
}
fragment.setArguments(arguments);
getSupportFragmentManager().beginTransaction()
.replace(R.id.case_detail_container, fragment)
.commit();
//in potrait
if (onePane) {
//hide recyclerview list and show containerview
final DisplayMetrics displayMetrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);
assert recyclerView != null;
final ViewGroup.LayoutParams paramsRecyclerView = recyclerView.getLayoutParams();
assert containerView != null;
final ViewGroup.LayoutParams paramsContainerView = containerView.getLayoutParams();
paramsRecyclerView.width = 0;
paramsContainerView.width = displayMetrics.widthPixels;
recyclerView.setLayoutParams(paramsRecyclerView);
containerView.setLayoutParams(paramsContainerView);
//show expand recylcerview list button
ActionButton.setVisibility(View.VISIBLE);
}
}
....
}
FirstPage.java
public class FirstPage extends Fragment {
public static final String ARG_ITEM_ID = "item_id";
...
public void onViewCreated(final View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
// TODO: next & prev button
TextView button_prev = (TextView) view.findViewById(R.id.btn_prev);
TextView button_next = (TextView) view.findViewById(R.id.btn_nxt);
PageTransition.pageContents(CaseContent.getSize(), getArguments().getString(ARG_ITEM_ID), button_next, button_prev);
....
}
}
PageTransition.java
public class PageTransition {
public static final String TAG = PageTransition.class.getSimpleName();
//take number of pages
public static void pageContents(int totalPage, String id, TextView next, TextView previous) {
//change string string to int
int pageID = Integer.parseInt(id);
final int prevID, nextID; // id for next & prev page
if(pageID == 1) {
previous.setVisibility(View.GONE); //hide prev button onn 1st page
prevID = 0;
nextID = ++pageID;
next.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
nextPage(nextID);
}
});
Log.d(TAG, "pageContents: first page");
} else if (pageID < totalPage - 1 && pageID !=1) {
prevID = --pageID;
nextID = 2+pageID;
next.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
nextPage(nextID);
}
});
previous.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
prevPage(prevID);
}
});
} else if (pageID == totalPage) {
next.setVisibility(View.GONE); //hide next button on last page
prevID = --pageID;
nextID = 0;
previous.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
prevPage(prevID);
}
});
}
}
private static void nextPage(int id) {
Log.d(TAG, "nextPage: id " + id);
}
private static void prevPage(int id) {
Log.d(TAG, "prevPage: id " + id);
}
}
經過一番思考,我終於能夠解決它。 我必須發送當前片段,該片段包含該類的“下一步”和“上一步”按鈕。 只有這樣,我才能使用getFragmentManager 。 我在FirstPage.java中使用以下代碼來設置“下一個”和“上一個”按鈕。
PageTransition.pageContents( this ,CaseContent.getSize(),“ formA ”,getArguments()。getString(ARG_ITEM_ID),button_next,button_prev);
然后在項目列表中,只要在項目列表菜單之一上單擊,就添加此代碼。
片段片段= PageTransition.init(id,“ formA”); getSupportFragmentManager()。beginTransaction().replace(R.id.case_detail_container,fragment).commit();
PageTransition.java
public class PageTransition {
public static final String TAG = PageTransition.class.getSimpleName();
private static int pageId;
public static Fragment init(String id, String form) {
Log.d(TAG, "currentPage: id " + id);
pageId = Integer.valueOf(id); //set current page Id
switch(form) {
case "formA" :
return formA_caseContent(id);
case "formB" :
return formB_caseContent(id);
case "formC" :
return formC_caseContent(id);
default:
Log.d(TAG, "currentPage: form id " + form + " out of bound.");
return null;
}
}
public static void pageContents(final Fragment fragment, int totalPage, final String form, String id, TextView next,
TextView previous) {
//change string string to int
int pageID = Integer.parseInt(id);
int prevID = 0, nextID = 0;
if(pageID == 1) {
previous.setVisibility(View.GONE); //hide prev button onn 1st page
nextID = ++pageID;
} else if (pageID > 1 && pageID < totalPage ) {
prevID = --pageID;
nextID = 2+pageID;
} else if (pageID == totalPage) {
next.setVisibility(View.GONE); //hide next button on last page
prevID = --pageID;
}
final int finalNextID = nextID;
next.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Fragment _fragment = init(String.valueOf(finalNextID), form);
fragment.getFragmentManager().beginTransaction()
.replace(R.id.case_detail_container, _fragment).commit();
}
});
final int finalPrevID = prevID;
previous.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Fragment _fragment = init(String.valueOf(finalPrevID), form);
fragment.getFragmentManager().beginTransaction()
.replace(R.id.case_detail_container, _fragment).commit();
}
});
}
private static Fragment formA_caseContent(String id) {
Bundle arguments = new Bundle();
Fragment fragment;
switch (id) {
case "1":
arguments.putString(FirstPage.ARG_ITEM_ID, id);
fragment = new FirstPage();
break;
case"2":
arguments.putString(SecondPage.ARG_ITEM_ID, id);
fragment = new SecondPage();
break;
....
default:
Log.i(TAG, "onSelectedMenuItem: Selection out of bound.");
arguments.putString(FirstPage.ARG_ITEM_ID, id);
fragment = new FirstPage();
break;
}
fragment.setArguments(arguments);
return fragment;
}
private static Fragment formB_caseContent(String id) {}
private static Fragment formc_caseContent(String id) {}
}
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