ViewPager添加圆点，循环翻页。fragment的使用

ViewPager添加圆点，循环翻页，添加标题

对比昨天，与昨天的类似，

public class MainActivity extends Activity {
private ViewPager viewpager;
private List<View> views;
private LayoutInflater mInflater;
private LinearLayout mLinearLayout;
private List<ImageView> mPoint;
private PagerTabStrip mPagerTab;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
viewpager = (ViewPager) findViewById(R.id.viewpager);
mLinearLayout= (LinearLayout) findViewById(R.id.linearlayout_image);
mPagerTab = (PagerTabStrip) findViewById(R.id.pager_tab);
mPagerTab.setBackgroundColor(Color.GRAY);
mPagerTab.setTabIndicatorColor(Color.RED);
mPagerTab.setTextColor(Color.BLUE);
mPagerTab.setDrawFullUnderline(true);
views = new ArrayList<>();
mInflater = getLayoutInflater();
View view1 = mInflater.inflate(R.layout.viewpager_one, null);
View view2 = mInflater.inflate(R.layout.viewpager_two, null);
View view3 = mInflater.inflate(R.layout.viewpager_three, null);
View view4 = mInflater.inflate(R.layout.viewpager_one, null);
views.add(view1);
views.add(view2);
views.add(view3);
views.add(view4);
mPoint=new ArrayList<>();
for (int i = 0;i<4;i++){
ImageView iv1 = new ImageView(this);
iv1.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT));
iv1.setImageResource(R.mipmap.eii);
iv1.setPadding(20,20,20,20);
mPoint.add(iv1);
mLinearLayout.addView(iv1);
}
mPoint.get(0).setImageResource(R.mipmap.eia);
ViewPagerAdapter myPager=new ViewPagerAdapter(views);
viewpager.setAdapter(myPager);
viewpager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

}

@Override
public void onPageSelected(int position) {
for (ImageView iv : mPoint) {
iv.setImageResource(R.mipmap.eii);
}
mPoint.get(position % views.size()).setImageResource(R.mipmap.eia);
}

@Override
public void onPageScrollStateChanged(int state) {

}
});
viewpager.setCurrentItem(Integer.MAX_VALUE/2-Integer.MAX_VALUE/2%views.size());
}

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

@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();

//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}

return super.onOptionsItemSelected(item);
}
}

添加标题时需要复写一个方法getPageTitle

public class ViewPagerAdapter extends PagerAdapter {
private List<View> views;
private String[] titles = {"标题1","标题2","标题3","标题4"};

@Override
public CharSequence getPageTitle(int position) {
return titles[position%titles.length];
}

public ViewPagerAdapter(List<View> views){
this.views = views;
}

@Override
public int getCount() {
// TODO Auto-generated method stub
return Integer.MAX_VALUE;
}

@Override
public boolean isViewFromObject(View arg0, Object arg1) {

return arg0==arg1;
}

@Override
public void destroyItem(ViewGroup container, int position, Object object) {

//      super.destroyItem(container, position, object);
//        container.removeView(views.get(position));
}

@Override
public Object instantiateItem(ViewGroup container, int position) {
// TODO Auto-generated method stub
View view = views.get(position%views.size());
if (view.getParent()!=null){
container.removeView(view);
}
container.addView(view);
if(position==2){
Button btn = (Button) view.findViewById(R.id.pager_button);
btn.setOnClickListener(new View.OnClickListener() {

@Override
public void onClick(View v) {
Toast.makeText(v.getContext(), "点击了按钮", Toast.LENGTH_LONG).show();
}
});
}
return view; //views.get(position%views.size());
}
}

三页的布局文件没有在此给出

<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"
tools:context="com.example.myviewpager.MainActivity" >
<android.support.v4.view.ViewPager
android:id="@+id/viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v4.view.PagerTabStrip
android:id="@+id/pager_tab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom">

</android.support.v4.view.PagerTabStrip>
</android.support.v4.view.ViewPager>
<LinearLayout
android:id="@+id/linearlayout_image"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:gravity="center_horizontal"
android:layout_margin="40dp">

</LinearLayout>
</RelativeLayout>

Fragment的使用

实现将第三个碎片的输入文本显示在第二个碎片上，Activity必须继承FragmentActivity。另外注意支持包的导入，使用support v4包

public class MainActivity extends FragmentActivity implements View.OnClickListener{
private FrameLayout mFrameLayout;
private Button mButton1;
private Button mButton2;
private Button mButton3;
private MyFirstFragment myFirstFragment;
private MySecondFragment mySecondFragment;
private MyThirdFragment myThirdFragment;
private FragmentManager mFragmentmanager;
private FragmentTransaction transaction;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mFrameLayout = (FrameLayout) findViewById(R.id.framelayout);
mButton1 = (Button) findViewById(R.id.button1);
mButton2 = (Button) findViewById(R.id.button2);
mButton3 = (Button) findViewById(R.id.button3);
mButton1.setOnClickListener(this);
mButton2.setOnClickListener(this);
mButton3.setOnClickListener(this);
mFragmentmanager = getSupportFragmentManager();
myFirstFragment = new MyFirstFragment();
mySecondFragment = new MySecondFragment();
myThirdFragment = new MyThirdFragment();
transaction = mFragmentmanager.beginTransaction();
transaction.add(R.id.framelayout,myFirstFragment);
transaction.add(R.id.framelayout,mySecondFragment);
transaction.add(R.id.framelayout,myThirdFragment);
transaction.hide(myFirstFragment);
transaction.hide(mySecondFragment);
transaction.commit();
}
@Override
public void onClick(View view) {
switch (view.getId()){
case R.id.button1:
transaction = mFragmentmanager.beginTransaction();
transaction.hide(mySecondFragment);
transaction.hide(myThirdFragment);
transaction.show(myFirstFragment);
transaction.commit();
break;
case R.id.button2:
transaction = mFragmentmanager.beginTransaction();
String text = myThirdFragment.getText();
mySecondFragment.setText(text);
transaction.hide(myFirstFragment);
transaction.hide(myThirdFragment);
transaction.show(mySecondFragment);
transaction.commit();
break;
case R.id.button3:
transaction = mFragmentmanager.beginTransaction();
transaction.hide(myFirstFragment);
transaction.hide(mySecondFragment);
transaction.show(myThirdFragment);
transaction.commit();
break;
default:
break;

}

}

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

@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();

//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}

return super.onOptionsItemSelected(item);
}
}

public class MyFirstFragment extends Fragment {
private Button mButtonTest;

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_test,null);
mButtonTest = (Button) view.findViewById(R.id.button);
mButtonTest.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Toast.makeText(getActivity(),"点击了按钮",Toast.LENGTH_SHORT).show();
}
});
return view;
}
}

public class MySecondFragment extends Fragment {
private Button mButtonTest;
private TextView mTextView;

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_sec,null);
mTextView = (TextView) view.findViewById(R.id.textview);
return view;
}
public void setText(String text){

mTextView.setText(text);

}
}

public class MyThirdFragment extends Fragment {
private Button mButtonTest;
private EditText mEditText;

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_third,null);
mEditText = (EditText) view.findViewById(R.id.edittext);
return view;
}
public String getText(){
String s = null;
if (mEditText!=null){
s=mEditText.getText().toString();
}
return s;
}
}

三个fragment的布局文件没有给出

<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"
tools:context=".MainActivity">
<FrameLayout
android:id="@+id/framelayout"
android:layout_width="match_parent"
android:layout_height="match_parent"></FrameLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:gravity="center">
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="碎片1"/>
<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="碎片2"/>
<Button
android:id="@+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="碎片3"/>

</LinearLayout>

</RelativeLayout>