FragmentTabHostの応用、完璧に滑りを解決する時、いくつかの問題
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Tabhostはもうお勧めしないので、今は一般的にFragmentTabhostを使って、FragmentTableHostを使って、開発者の効率を高めることができますが、いくつかの穴があります.次は自分でカスタマイズしたものを出して共有します.
1.まずレイアウトファイルを見る
次は各対応するアイコンです
これだけだ
1.まずレイアウトファイルを見る
android:layout_width="match_parent"
android:layout_height="20dp"
android:layout_gravity="bottom"
android:background="#1b1818"
/>
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
android:id="@+id/tabContent"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1" />
android:id="@+id/tabs"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="@android:color/transparent">
android:id="@android:id/tabcontent"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_weight="0" />
の上のimageViewは底のレイアウトの背景色を変えるために使われています.それからFramlayoutは私たちが定義したレイアウトが公式に要求されていますが、下のFragLayoutはシステムで、idから見ることができます.レイアウトラインの紹介がこんなに多いので、次は世代コードの古いルールコードが貼られています.import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.TabHost;
import com.cnlive.tvlivebroadcast.R;
import com.cnlive.tvlivebroadcast.ui.fragment.IndexFragment;
import com.cnlive.tvlivebroadcast.ui.fragment.LiveFragment;
import com.cnlive.tvlivebroadcast.ui.fragment.MineFragment;
import com.cnlive.tvlivebroadcast.ui.widget.CustomFragmentTabHost;
/**
* Created by xiansong on 2016/10/28.
*/
public class MainActivity extends AppCompatActivity {
private CustomFragmentTabHost host;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
host = (CustomFragmentTabHost) findViewById(R.id.tabs);
//containId Fragment id
host.setup(MainActivity.this,getSupportFragmentManager(),R.id.tabContent);
TabHost.TabSpec tmp = host.newTabSpec("0");
// UI
View inflate = LayoutInflater.from(this).inflate(R.layout.view_index, null);
tmp.setIndicator(inflate);
// tabhost
host.addTab(tmp, IndexFragment.class,null);
TabHost.TabSpec tmp1 = host.newTabSpec("1");
// UI
View inflate1 = LayoutInflater.from(this).inflate(R.layout.view_cnlive, null);
tmp1.setIndicator(inflate1);
// tabhost
host.addTab(tmp1, LiveFragment.class,null);
TabHost.TabSpec tmp2 = host.newTabSpec("2");
View inflate2 = LayoutInflater.from(this).inflate(R.layout.view_mine, null);
tmp2.setIndicator(inflate2);
host.addTab(tmp2, MineFragment.class,null);
host.setCurrentTabByTag("1");
}
}
最初のステップはまずコントロールを見つけて、それから私たちとコンテナのidのバインドを防止して、最後に各クラスのためにコントロールを設定して、内容を設定しましたView inflate = LayoutInflater.from(this).inflate(R.layout.view_index, null);
tmp.setIndicator(inflate);
この2行のコードは、対応するクラスにコントロールをバインドすることを意味し、情勢は私たちが言った下部tableの対応するアイコンです.host.addTab(tmp, IndexFragment.class,null);
この行のコードはtablehostに追加され、最後に設定されます.host.setCurrentTabByTag("1");
どれを選択次は各対応するアイコンです
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="bottom|center_horizontal">
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/index"/>
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="bottom|center_horizontal">
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/tab_live"
/>
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="bottom|center_horizontal"
>
android:src="@drawable/mine"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
残っているのは対応するクラスで、あなた自身が作成することができて、こんなに多く言って、最後に自分で貼り付けて、往復スライドする時のデータの損失を避けるためですimport android.content.Context;
import android.content.res.TypedArray;
import android.os.Bundle;
import android.os.Parcel;
import android.os.Parcelable;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
import android.widget.FrameLayout;
import android.widget.LinearLayout;
import android.widget.TabHost;
import android.widget.TabWidget;
import java.util.ArrayList;
/**
* Special TabHost that allows the use of {@link Fragment} objects for
* its tab content. When placing this in a view hierarchy, after inflating
* the hierarchy you must call {@link #setup(Context, FragmentManager, int)}
* to complete the initialization of the tab host.
*
* Here is a simple example of using a FragmentTabHost in an Activity:
*
* {@sample development/samples/Support4Demos/src/com/example/android/supportv4/app/FragmentTabs.java
* complete}
*
* This can also be used inside of a fragment through fragment nesting:
*
* {@sample development/samples/Support4Demos/src/com/example/android/supportv4/app/FragmentTabsFragmentSupport.java
* complete}
*/
public class CustomFragmentTabHost extends TabHost
implements TabHost.OnTabChangeListener {
private final ArrayList mTabs = new ArrayList();
private FrameLayout mRealTabContent;
private Context mContext;
private FragmentManager mFragmentManager;
private int mContainerId;
private OnTabChangeListener mOnTabChangeListener;
private TabInfo mLastTab;
private boolean mAttached;
static final class TabInfo {
private final String tag;
private final Class> clss;
private final Bundle args;
private Fragment fragment;
TabInfo(String _tag, Class> _class, Bundle _args) {
tag = _tag;
clss = _class;
args = _args;
}
}
static class DummyTabFactory implements TabContentFactory {
private final Context mContext;
public DummyTabFactory(Context context) {
mContext = context;
}
@Override
public View createTabContent(String tag) {
View v = new View(mContext);
v.setMinimumWidth(0);
v.setMinimumHeight(0);
return v;
}
}
static class SavedState extends BaseSavedState {
String curTab;
SavedState(Parcelable superState) {
super(superState);
}
private SavedState(Parcel in) {
super(in);
curTab = in.readString();
}
@Override
public void writeToParcel(Parcel out, int flags) {
super.writeToParcel(out, flags);
out.writeString(curTab);
}
@Override
public String toString() {
return "FragmentTabHost.SavedState{"
+ Integer.toHexString(System.identityHashCode(this))
+ " curTab=" + curTab + "}";
}
public static final Creator CREATOR
= new Creator() {
public SavedState createFromParcel(Parcel in) {
return new SavedState(in);
}
public SavedState[] newArray(int size) {
return new SavedState[size];
}
};
}
public CustomFragmentTabHost(Context context) {
// Note that we call through to the version that takes an AttributeSet,
// because the simple Context construct can result in a broken object!
super(context, null);
initFragmentTabHost(context, null);
}
public CustomFragmentTabHost(Context context, AttributeSet attrs) {
super(context, attrs);
initFragmentTabHost(context, attrs);
}
private void initFragmentTabHost(Context context, AttributeSet attrs) {
TypedArray a = context.obtainStyledAttributes(attrs,
new int[] { android.R.attr.inflatedId }, 0, 0);
mContainerId = a.getResourceId(0, 0);
a.recycle();
super.setOnTabChangedListener(this);
}
private void ensureHierarchy(Context context) {
// If owner hasn't made its own view hierarchy, then as a convenience
// we will construct a standard one here.
if (findViewById(android.R.id.tabs) == null) {
LinearLayout ll = new LinearLayout(context);
ll.setOrientation(LinearLayout.VERTICAL);
addView(ll, new LayoutParams(
ViewGroup.LayoutParams.FILL_PARENT,
ViewGroup.LayoutParams.FILL_PARENT));
TabWidget tw = new TabWidget(context);
tw.setId(android.R.id.tabs);
tw.setOrientation(TabWidget.HORIZONTAL);
ll.addView(tw, new LinearLayout.LayoutParams(
ViewGroup.LayoutParams.FILL_PARENT,
ViewGroup.LayoutParams.WRAP_CONTENT, 0));
FrameLayout fl = new FrameLayout(context);
fl.setId(android.R.id.tabcontent);
ll.addView(fl, new LinearLayout.LayoutParams(0, 0, 0));
mRealTabContent = fl = new FrameLayout(context);
mRealTabContent.setId(mContainerId);
ll.addView(fl, new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.FILL_PARENT, 0, 1));
}
}
/**
* @deprecated Don't call the original TabHost setup, you must instead
* call {@link #setup(Context, FragmentManager)} or
* {@link #setup(Context, FragmentManager, int)}.
*/
@Override @Deprecated
public void setup() {
throw new IllegalStateException(
"Must call setup() that takes a Context and FragmentManager");
}
public void setup(Context context, FragmentManager manager) {
ensureHierarchy(context); // Ensure views required by super.setup()
super.setup();
mContext = context;
mFragmentManager = manager;
ensureContent();
}
public void setup(Context context, FragmentManager manager, int containerId) {
ensureHierarchy(context); // Ensure views required by super.setup()
super.setup();
mContext = context;
mFragmentManager = manager;
mContainerId = containerId;
ensureContent();
mRealTabContent.setId(containerId);
// We must have an ID to be able to save/restore our state. If
// the owner hasn't set one at this point, we will set it ourself.
if (getId() == View.NO_ID) {
setId(android.R.id.tabhost);
}
}
private void ensureContent() {
if (mRealTabContent == null) {
mRealTabContent = (FrameLayout)findViewById(mContainerId);
if (mRealTabContent == null) {
throw new IllegalStateException(
"No tab content FrameLayout found for id " + mContainerId);
}
}
}
@Override
public void setOnTabChangedListener(OnTabChangeListener l) {
mOnTabChangeListener = l;
}
public void addTab(TabSpec tabSpec, Class> clss, Bundle args) {
tabSpec.setContent(new DummyTabFactory(mContext));
String tag = tabSpec.getTag();
TabInfo info = new TabInfo(tag, clss, args);
if (mAttached) {
// If we are already attached to the window, then check to make
// sure this tab's fragment is inactive if it exists. This shouldn't
// normally happen.
info.fragment = mFragmentManager.findFragmentByTag(tag);
if (info.fragment != null && !info.fragment.isDetached()) {
FragmentTransaction ft = mFragmentManager.beginTransaction();
ft.detach(info.fragment);
ft.commit();
}
}
mTabs.add(info);
addTab(tabSpec);
}
@Override
protected void onAttachedToWindow() {
super.onAttachedToWindow();
String currentTab = getCurrentTabTag();
// Go through all tabs and make sure their fragments match
// the correct state.
FragmentTransaction ft = null;
for (int i=0; i<mTabs.size(); i++) {
TabInfo tab = mTabs.get(i);
tab.fragment = mFragmentManager.findFragmentByTag(tab.tag);
if (tab.fragment != null && !tab.fragment.isDetached()) {
if (tab.tag.equals(currentTab)) {
// The fragment for this tab is already there and
// active, and it is what we really want to have
// as the current tab. Nothing to do.
mLastTab = tab;
} else {
// This fragment was restored in the active state,
// but is not the current tab. Deactivate it.
if (ft == null) {
ft = mFragmentManager.beginTransaction();
}
ft.detach(tab.fragment);
}
}
}
// We are now ready to go. Make sure we are switched to the
// correct tab.
mAttached = true;
ft = doTabChanged(currentTab, ft);
if (ft != null) {
ft.commit();
mFragmentManager.executePendingTransactions();
}
}
@Override
protected void onDetachedFromWindow() {
super.onDetachedFromWindow();
mAttached = false;
}
@Override
protected Parcelable onSaveInstanceState() {
Parcelable superState = super.onSaveInstanceState();
SavedState ss = new SavedState(superState);
ss.curTab = getCurrentTabTag();
return ss;
}
@Override
protected void onRestoreInstanceState(Parcelable state) {
SavedState ss = (SavedState)state;
super.onRestoreInstanceState(ss.getSuperState());
setCurrentTabByTag(ss.curTab);
}
@Override
public void onTabChanged(String tabId) {
if (mAttached) {
FragmentTransaction ft = doTabChanged(tabId, null);
if (ft != null) {
ft.commit();
}
}
if (mOnTabChangeListener != null) {
mOnTabChangeListener.onTabChanged(tabId);
}
}
private FragmentTransaction doTabChanged(String tabId, FragmentTransaction ft) {
TabInfo newTab = null;
for (int i=0; i<mTabs.size(); i++) {
TabInfo tab = mTabs.get(i);
if (tab.tag.equals(tabId)) {
newTab = tab;
}
}
if (newTab == null) {
throw new IllegalStateException("No tab known for tag " + tabId);
}
if (mLastTab != newTab) {
if (ft == null) {
ft = mFragmentManager.beginTransaction();
}
if (mLastTab != null) {
// if (mLastTab.fragment != null) {
// ft.detach(mLastTab.fragment);
// }
if (mLastTab.fragment != null) {
ft.hide(mLastTab.fragment);
}
}
if (newTab != null) {
if (newTab.fragment == null) {
newTab.fragment = Fragment.instantiate(mContext,
newTab.clss.getName(), newTab.args);
ft.add(mContainerId, newTab.fragment, newTab.tag);
} else {
// ft.attach(newTab.fragment);
if (newTab.fragment.isHidden()){
ft.show(newTab.fragment);
} else{
ft.attach(newTab.fragment);
}
}
}
mLastTab = newTab;
}
return ft;
}
}
これだけだ