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显示不规则行为的 Android Fragments

转载 作者:行者123 更新时间:2023-11-30 03:22:51 27 4
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我的 Activity 中有多个 fragment 。它应该在启动时只启动第一个 fragment 。它也初始化第二个。此外,我通过滑动 Action 从一个 fragment 移动到另一个 fragment 。当我从第一个 fragment 滑动到下一个 fragment 时,也会启动行中的第三个 fragment 。

我必须从服务器获取数据,然后填充该 fragment 。网络请求已发送,但不是针对我要发送的请求,而是针对它旁边的 fragment 。

请指出我错在哪里...

提前致谢。

代码如下:

注意:正在使用示例代码,请考虑其他 fragment 及其布局与Fragment1相同。

主要 Activity

package com.example.fragments;


import java.util.List;
import java.util.Vector;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.WindowManager;
import android.widget.HorizontalScrollView;
import android.widget.TableLayout;
import android.widget.TextView;

public class MainActivity extends FragmentActivity implements OnClickListener {

/**
* Constants for tabs
*/
public static final int TAB_SCORES = 0;
public static final int TAB_PAVILION = 1;
public static final int TAB_FRIENDS = 2;
public static final int TAB_OTHER = 3;
public static final int TAB_CROWD = 4;
public static final int TAB_SOCIAL = 5;

private List<Fragment> fragments=null;
private FragmentsAdaptor _adapter;

/** The context object. */
public static Object contextObject = null;

private TableLayout scoresTab, socialTab, pavilionTab, friendsTab, othersTab, crowdTab;

private TextView mScoresTv, mPavilionTv, mFriendsTv, mOtherTv, mCrowdTv, mSocialTv;

private HorizontalScrollView tabsLayout;
private int fragmentPosition;

public ViewPager mViewPager;

private int moveRight = 100;

@Override
protected void onStart() {
super.onStart();
}

/**
/* (non-Javadoc)
* @see android.app.Activity#onCreate(android.os.Bundle)
*/
@Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
setContentView(R.layout.activity_main);
this.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);

mViewPager = (ViewPager)findViewById(R.id.viewPager);

setViews();
addListeners();
setTab();

addFragments();
}

private void setViews() {
scoresTab = (TableLayout)findViewById(R.id.scores_tab);
pavilionTab = (TableLayout)findViewById(R.id.pavilion_tab);
friendsTab = (TableLayout)findViewById(R.id.friends_tab);
othersTab = (TableLayout)findViewById(R.id.others_tab);
crowdTab = ((TableLayout)findViewById(R.id.crowd_tab));
socialTab = (TableLayout)findViewById(R.id.social_tab);

tabsLayout = (HorizontalScrollView)findViewById(R.id.tabs_layout);

mScoresTv = (TextView)findViewById(R.id.scores);
mPavilionTv = (TextView)findViewById(R.id.pavilion);
mFriendsTv = (TextView)findViewById(R.id.friends);
mOtherTv = (TextView)findViewById(R.id.other);
mCrowdTv = (TextView)findViewById(R.id.crowd);
mSocialTv = (TextView)findViewById(R.id.social);

}

private void addListeners() {
mScoresTv.setOnClickListener(MainActivity.this);
mPavilionTv.setOnClickListener(MainActivity.this);
mFriendsTv.setOnClickListener(MainActivity.this);
mOtherTv.setOnClickListener(MainActivity.this);
mCrowdTv.setOnClickListener(MainActivity.this);
mSocialTv.setOnClickListener(MainActivity.this);

}

private void addFragments(){
fragments = new Vector<Fragment>();
fragments.add(new Fragment1(this));
fragments.add(new Fragment2(this));
fragments.add(new Fragment3(this));
fragments.add(new Fragment4(this));
fragments.add(new Fragment5(this));
fragments.add(new Fragment6(this));

this._adapter = new FragmentsAdaptor(super.getSupportFragmentManager(), fragments);
mViewPager.setAdapter(this._adapter);
}

@Override
public void onClick(View v){
onTabsClick(v);
}

public void onTabsClick(View v) {
//reset layout of all the text views
resetlayouts();

if(v == mScoresTv) {
if(mViewPager.getCurrentItem() != TAB_SCORES) {
changeTab(TAB_SCORES);
scoresTab.setBackgroundColor(getResources().getColor(android.R.color.black));
mScoresTv.setTextColor(getResources().getColor(android.R.color.white));
}
} else if(v == mCrowdTv) {
if(mViewPager.getCurrentItem() != TAB_CROWD) {
changeTab(TAB_CROWD);
crowdTab.setBackgroundColor(getResources().getColor(android.R.color.black));
mCrowdTv.setTextColor(getResources().getColor(android.R.color.white));
}
} else if(v == mFriendsTv) {
if(mViewPager.getCurrentItem() != TAB_FRIENDS) {
changeTab(TAB_FRIENDS);
friendsTab.setBackgroundColor(getResources().getColor(android.R.color.black));
mFriendsTv.setTextColor(getResources().getColor(android.R.color.white));
}
} else if(v == mOtherTv) {
if(mViewPager.getCurrentItem() != TAB_OTHER) {
changeTab(TAB_OTHER);
othersTab.setBackgroundColor(getResources().getColor(android.R.color.black));
mOtherTv.setTextColor(getResources().getColor(android.R.color.white));
}
} else if(v == mPavilionTv) {
if(mViewPager.getCurrentItem() != TAB_PAVILION) {
changeTab(TAB_PAVILION);
pavilionTab.setBackgroundColor(getResources().getColor(android.R.color.black));
mPavilionTv.setTextColor(getResources().getColor(android.R.color.white));
}

} else if(v == mSocialTv) {
if(mViewPager.getCurrentItem() != TAB_SOCIAL) {
changeTab(TAB_SOCIAL);
socialTab.setBackgroundColor(getResources().getColor(android.R.color.black));
mSocialTv.setTextColor(getResources().getColor(android.R.color.white));
}
}
}

private void changeTab(int tabType) {
mViewPager.setCurrentItem(tabType);
System.out.println("tab to change to: " + tabType);
}

private void resetlayouts(){
scoresTab.setBackgroundColor(getResources().getColor(android.R.color.transparent));
pavilionTab.setBackgroundColor(getResources().getColor(android.R.color.transparent));
friendsTab.setBackgroundColor(getResources().getColor(android.R.color.transparent));
othersTab.setBackgroundColor(getResources().getColor(android.R.color.transparent));
crowdTab.setBackgroundColor(getResources().getColor(android.R.color.transparent));
socialTab.setBackgroundColor(getResources().getColor(android.R.color.transparent));

mScoresTv.setTextColor(getResources().getColor(android.R.color.black));
mPavilionTv.setTextColor(getResources().getColor(android.R.color.black));
mFriendsTv.setTextColor(getResources().getColor(android.R.color.black));
mOtherTv.setTextColor(getResources().getColor(android.R.color.black));
mCrowdTv.setTextColor(getResources().getColor(android.R.color.black));
mSocialTv.setTextColor(getResources().getColor(android.R.color.black));

}

private void setTab() {
mViewPager.setOnPageChangeListener(new OnPageChangeListener() {

@Override
public void onPageScrollStateChanged(int position) { }
@Override
public void onPageScrolled(int arg0, float arg1, int arg2) { }
@Override
public void onPageSelected(int position) {
System.out.println("setTab:::::::::::::::::::::::::::::::::::" + position);
int previousFragment = fragmentPosition;

if(previousFragment < position ) {
tabsLayout.scrollTo(tabsLayout.getScrollX() + moveRight*fragmentPosition, tabsLayout.getScrollY());
tabsLayout.requestLayout();
}

if(previousFragment > position ) {
tabsLayout.scrollTo(tabsLayout.getScrollX() - moveRight*fragmentPosition, tabsLayout.getScrollY());
tabsLayout.requestLayout();

}

fragmentPosition = position;
resetlayouts();
System.out.println("In on tab change listener!");

switch(position) {
case TAB_SCORES:
System.out.println("scores");
scoresTab.setBackgroundColor(getResources().getColor(android.R.color.black));
mScoresTv.setTextColor(getResources().getColor(android.R.color.white));
//give a call to netmanager and repaint livescorescreen on the basis of selected fragment
break;

case TAB_PAVILION:{
System.out.println("pavilion");
pavilionTab.setBackgroundColor(getResources().getColor(android.R.color.black));
mPavilionTv.setTextColor(getResources().getColor(android.R.color.white));
//give a call to netmanager and repaint livescorescreen on the basis of selected fragment
break;
}
case TAB_FRIENDS:{
System.out.println("friends");
friendsTab.setBackgroundColor(getResources().getColor(android.R.color.black));
mFriendsTv.setTextColor(getResources().getColor(android.R.color.white));
//give a call to netmanager and repaint livescorescreen on the basis of selected fragment
break;
}
case TAB_OTHER:{
System.out.println("others");
othersTab.setBackgroundColor(getResources().getColor(android.R.color.black));
mOtherTv.setTextColor(getResources().getColor(android.R.color.white));
//give a call to netmanager and repaint livescorescreen on the basis of selected fragment
break;
}
case TAB_CROWD:{
System.out.println("crowd");
crowdTab.setBackgroundColor(getResources().getColor(android.R.color.black));
mCrowdTv.setTextColor(getResources().getColor(android.R.color.white));
//give a call to netmanager and repaint livescorescreen on the basis of selected fragment
break;
}
case TAB_SOCIAL:{
System.out.println("social");
socialTab.setBackgroundColor(getResources().getColor(android.R.color.black));
mSocialTv.setTextColor(getResources().getColor(android.R.color.white));
//give a call to netmanager and repaint livescorescreen on the basis of selected fragment
break;
}
}
Fragment fragment = _adapter.getFragment(previousFragment);
if(fragment != null)
fragment.onPause();

}
});
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}

}

fragment 适配器

package com.example.fragments;

import java.util.List;

import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;

public class FragmentsAdaptor extends FragmentPagerAdapter {


private List<Fragment> fragments;
/**
* @param fm
* @param fragments
*/
public FragmentsAdaptor(FragmentManager fm, List<Fragment> fragments) {
super(fm);
this.fragments = fragments;
}
/* (non-Javadoc)
* @see android.support.v4.app.FragmentPagerAdapter#getItem(int)
*/
@Override
public Fragment getItem(int position) {
return this.fragments.get(position);
}

/* (non-Javadoc)
* @see android.support.v4.view.PagerAdapter#getCount()
*/
@Override
public int getCount() {
return this.fragments.size();
}

public Fragment getFragment(int position) {
return this.fragments.get(position);
}

}

fragment 1

package com.example.fragments;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.OnClickListener;

public class Fragment1 extends Fragment implements OnClickListener {
private Context context;

public Fragment1() {}

public Fragment1(Context contex) {
this.context=contex;
}

@Override
public void onClick(View arg0) {

}

@Override
public void onInflate(Activity activity, AttributeSet attrs, Bundle savedInstanceState) {
super.onInflate(activity, attrs, savedInstanceState);
System.out.println("Fragment1.onInflate() called................");
}

@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
System.out.println("Fragment1.onAttach() called................");
}

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
System.out.println("Fragment1.onCreate() called................");
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
System.out.println("Fragment1.onCreateView() called................");

View root = (View) inflater.inflate(R.layout.fragment1_screen, null);
updateArticleView(root);

return root;
}


@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
System.out.println("Fragment1.onActivityCreated() called................");
}

@Override
public void onStart() {
super.onStart();
System.out.println("Fragment1.onStart() called................");
}

@Override
public void onResume() {
super.onResume();
System.out.println("Fragment1.onResume() called................");
}

@Override
public void onPause() {
super.onPause();
System.out.println("Fragment1.onPause() called................");
onDestroyView();
}

@Override
public void onDestroyView() {
super.onDestroyView();
System.out.println("Fragment1.onDestroyView() called................");
onDestroy();
}

@Override
public void onDestroy() {
super.onDestroy();
System.out.println("Fragment1.onDestroy() called................");
onDetach();
}

@Override
public void onDetach() {
super.onDetach();
System.out.println("Fragment1.onDetach() called................");
}

public void updateArticleView(View view) {

}

}

主要 Activity 布局

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin" >

<HorizontalScrollView
android:id="@+id/tabs_layout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@android:color/transparent"
android:paddingLeft="2dp"
android:paddingRight="2dp" >

<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@android:color/transparent"
android:orientation="horizontal" >

<!-- First Tab -->

<TableLayout
android:id="@+id/scores_tab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@android:color/black" >

<TableRow
android:id="@+id/tableRow1"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:gravity="center_vertical" >

<TextView
android:id="@+id/scores"
android:layout_width="fill_parent"
android:layout_height="30dp"
android:gravity="center_vertical"
android:paddingLeft="30dp"
android:paddingRight="30dp"
android:text="Scores"
android:textColor="@android:color/white"
android:textSize="11sp" />

<TextView
android:layout_width="1px"
android:layout_height="fill_parent"
android:text=""
android:textColor="@android:color/black" />
</TableRow>
</TableLayout>

<!-- Second Tab -->

<TableLayout
android:id="@+id/pavilion_tab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="@android:color/transparent" >

<TableRow
android:id="@+id/tableRow2"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:gravity="center_vertical" >

<TextView
android:id="@+id/pavilion"
android:layout_width="fill_parent"
android:layout_height="30dp"
android:gravity="center_vertical"
android:paddingLeft="30dp"
android:paddingRight="25dp"
android:text="Pavilion"
android:textColor="@android:color/black"
android:textSize="11sp" />

<TextView
android:layout_width="1px"
android:layout_height="fill_parent"
android:text=""
android:textColor="@android:color/black" />
</TableRow>
</TableLayout>

<!-- Third Tab -->

<TableLayout
android:id="@+id/friends_tab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="@android:color/transparent" >

<TableRow
android:id="@+id/tableRow3"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:gravity="center_vertical" >

<TextView
android:id="@+id/friends"
android:layout_width="fill_parent"
android:layout_height="30dp"
android:gravity="center_vertical"
android:paddingLeft="30dp"
android:paddingRight="30dp"
android:text="Friends"
android:textColor="@android:color/black"
android:textSize="11sp" />

<TextView
android:layout_width="1px"
android:layout_height="fill_parent"
android:text=""
android:textColor="@android:color/black" />
</TableRow>
</TableLayout>

<!-- Fourth Tab -->

<TableLayout
android:id="@+id/others_tab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="@android:color/transparent" >

<TableRow
android:id="@+id/tableRow4"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:gravity="center_vertical" >

<TextView
android:id="@+id/other"
android:layout_width="fill_parent"
android:layout_height="30dp"
android:gravity="center_vertical"
android:paddingLeft="30dp"
android:paddingRight="30dp"
android:text="Other"
android:textColor="@android:color/black"
android:textSize="11sp" />

<TextView
android:layout_width="1px"
android:layout_height="fill_parent"
android:text=""
android:textColor="@android:color/black" />
</TableRow>
</TableLayout>

<!-- Fifth Tab -->

<TableLayout
android:id="@+id/crowd_tab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="@android:color/transparent" >

<TableRow
android:id="@+id/tableRow5"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:gravity="center_vertical" >

<TextView
android:id="@+id/crowd"
android:layout_width="fill_parent"
android:layout_height="30dp"
android:gravity="center_vertical"
android:paddingLeft="30dp"
android:paddingRight="30dp"
android:text="Crowd"
android:textColor="@android:color/black"
android:textSize="11sp" />

<TextView
android:layout_width="0px"
android:layout_height="fill_parent"
android:text=""
android:textColor="@android:color/black" />
</TableRow>
</TableLayout>

<!-- Sixth Tab -->

<TableLayout
android:id="@+id/social_tab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center_vertical"
android:textColor="@android:color/transparent" >

<TableRow
android:id="@+id/tableRow6"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:gravity="center_vertical" >

<TextView
android:id="@+id/social"
android:layout_width="fill_parent"
android:layout_height="30dp"
android:gravity="center_vertical"
android:paddingLeft="30dp"
android:paddingRight="30dp"
android:text="Social"
android:textColor="@android:color/black"
android:textSize="12sp" />
</TableRow>
</TableLayout>
</LinearLayout>
</HorizontalScrollView>

<android.support.v4.view.ViewPager
android:id="@+id/viewPager"
android:layout_width="match_parent"
android:layout_height="300dp"
android:layout_below="@id/tabs_layout"
android:layout_marginBottom="10dp"
android:layout_marginTop="10dp" >
</android.support.v4.view.ViewPager>

fragment 布局

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/relLay"
android:layout_width="match_parent"
android:layout_height="match_parent" >

<TextView
android:id="@+id/text1"
android:text="Fragment1 Text"
android:textColor="@android:color/black"
android:layout_width="match_parent"
android:layout_height="match_parent" />

</RelativeLayout>

最佳答案

我通过将以下代码放在 OnPageChangeListener.onPageSelected() 的末尾来实现它

Fragment fragment = _adapter.getFragment(previousFragment);
if(fragment != null) {
fragment.onPause();
}

我按以下方式使用 onPause()

public void onPause(){
super.onPause();

onDestroyView();
}

public void onDestroyView() {
super.onDestroyView();

onDestroy();
}

public void onDestroy() {
super.onDestroy();

onDetach();
}

public void onDetach() {
super.onDetach();

}

关于显示不规则行为的 Android Fragments,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/18785207/

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