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import android.support.v4.app.Fragment; |
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import android.support.v4.app.FragmentManager; |
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import android.support.v4.app.FragmentTransaction; |
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import android.text.TextUtils; |
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import your.package.R; |
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public class NavigationManager { |
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private FragmentManager mFragmentManager; |
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public NavigationManager(FragmentManager fragmentManager){ |
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mFragmentManager = fragmentManager; |
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} |
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/** |
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* Displays the next fragment |
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* |
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* @param fragment |
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*/ |
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public void attach(Fragment fragment, boolean isAnimated, String tag) { |
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if (mFragmentManager != null && !isAtTheTopOnBackStack(tag)) { |
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FragmentTransaction ft = mFragmentManager.beginTransaction(); |
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if (isAnimated) |
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ft.setCustomAnimations(R.anim.abc_fade_in, R.anim.abc_fade_out, R.anim.abc_fade_in, R.anim.abc_fade_out); |
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if (!TextUtils.isEmpty(tag)) |
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ft.addToBackStack(tag); |
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ft.replace(R.id.content_frame, fragment); |
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ft.commit(); |
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} |
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} |
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public void attach(Fragment fragment, int containerId, boolean isAnimated, String tag) { |
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if (mFragmentManager != null && !isAtTheTopOnBackStack(tag)) { |
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FragmentTransaction ft = mFragmentManager.beginTransaction(); |
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if (isAnimated) |
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ft.setCustomAnimations(R.anim.abc_fade_in, R.anim.abc_fade_out, R.anim.abc_fade_in, R.anim.abc_fade_out); |
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if (!TextUtils.isEmpty(tag)) |
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ft.addToBackStack(tag); |
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ft.add(containerId, fragment, tag); |
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ft.commit(); |
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} |
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} |
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public void attachAsRoot(Fragment fragment, boolean isAnimated, String tag) { |
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if (mFragmentManager != null && !isAtTheTopOnBackStack(tag)) { |
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for (int i = 0; i < mFragmentManager.getBackStackEntryCount(); i++) |
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mFragmentManager.popBackStackImmediate(); |
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attach(fragment, isAnimated, tag); |
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} |
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} |
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/** |
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* @return true if stack has been popped succesfully, false if the stack has one element |
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*/ |
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public boolean popBackStackImmediate() { |
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if (mFragmentManager == null) return false; |
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if (mFragmentManager.getBackStackEntryCount() == 0) { |
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return false; |
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} else { |
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mFragmentManager.popBackStackImmediate(); |
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return true; |
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} |
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} |
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private boolean isAtTheTopOnBackStack(String tag) { |
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if (mFragmentManager.getBackStackEntryCount() == 0) return false; |
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return TextUtils.equals(mFragmentManager.getBackStackEntryAt(mFragmentManager.getBackStackEntryCount() - 1).getName(), tag); |
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} |
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public boolean isBackstackEmpty(){ |
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return mFragmentManager.getBackStackEntryCount() == 0; |
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} |
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public int getBackstackEntryCount(){ |
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return mFragmentManager.getBackStackEntryCount(); |
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} |
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} |
