创建一个 class for "Next" & "Previous" method for Master-Detail view fragments
Create a class for "Next" & "Previous" method for Master-Detail view fragments
我想创建一个 class 来保存我的上一个和下一个按钮。 class 将有助于减少我必须为每个 class 中的每个按钮编写的重复代码的数量。例如，在 FirstPage.class 片段中调用了以下代码。
PageTransition.pageContents(CaseContent.getSize(), getArguments().getString(ARG_ITEM_ID), button_next, button_prev);
下一个和上一个按钮存储在我在每个布局中调用的 header.xml 中。我为我的代码使用了主从视图。
我试图在 CaseListActivity 中为我的 class 使用相同的代码。但是，当我尝试将代码添加到 PageTransition[=40= 中的 nextPage() 方法时，getSupportFragmentManager 出现问题].
Bundle arguments = new Bundle(); Fragment fragment;
arguments.putString(FirstPage.ARG_ITEM_ID, id); fragment = new
FirstPage(); fragment.setArguments(arguments);
getSupportFragmentManager().beginTransaction()
.replace(R.id.case_detail_container, fragment) .commit();
是否有更好的方法来构建我的过渡 class？
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);
}
}
想了想，终于搞定了。我必须将包含 "next" 和 "prev" 按钮的当前片段发送到 class。只有这样，我才能使用 getFragmentManager。我在 FirstPage.java 中使用以下代码来设置 "next" 和 "pre" 按钮。
PageTransition.pageContents(this, CaseContent.getSize(), "formA",
getArguments().getString(ARG_ITEM_ID), button_next, button_prev);
然后在项目列表上，每当使用单击项目列表菜单之一时，我都会添加此代码。
Fragment fragment = 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) {}
}
我想创建一个 class 来保存我的上一个和下一个按钮。 class 将有助于减少我必须为每个 class 中的每个按钮编写的重复代码的数量。例如，在 FirstPage.class 片段中调用了以下代码。
PageTransition.pageContents(CaseContent.getSize(), getArguments().getString(ARG_ITEM_ID), button_next, button_prev);
下一个和上一个按钮存储在我在每个布局中调用的 header.xml 中。我为我的代码使用了主从视图。
我试图在 CaseListActivity 中为我的 class 使用相同的代码。但是，当我尝试将代码添加到 PageTransition[=40= 中的 nextPage() 方法时，getSupportFragmentManager 出现问题].
Bundle arguments = new Bundle(); Fragment fragment; arguments.putString(FirstPage.ARG_ITEM_ID, id); fragment = new FirstPage(); fragment.setArguments(arguments); getSupportFragmentManager().beginTransaction()
.replace(R.id.case_detail_container, fragment) .commit();
是否有更好的方法来构建我的过渡 class？
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);
}
}
想了想，终于搞定了。我必须将包含 "next" 和 "prev" 按钮的当前片段发送到 class。只有这样，我才能使用 getFragmentManager。我在 FirstPage.java 中使用以下代码来设置 "next" 和 "pre" 按钮。
PageTransition.pageContents(this, CaseContent.getSize(), "formA", getArguments().getString(ARG_ITEM_ID), button_next, button_prev);
然后在项目列表上，每当使用单击项目列表菜单之一时，我都会添加此代码。
Fragment fragment = 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) {}
}