我有一个viewpager和一些在viewpager上方单击设置的图像。问题是我根据viewpager的位置将图像设置为onclick。它可以正常工作，但是问题是，如果我启动该应用程序并单击其中一张图像，它会显示位置为1时应显示的图像，但是如果我滚动到第二张图像然后再滚动回到第一张图像，该位置不再正确，它保持在第二位置。每次滚动后如何清除位置以使其正确定位？谢谢 ！
MainActivity.java：
package com.descoper.rom;
import java.io.IOException;
import android.app.Activity;
import android.app.Dialog;
import android.app.WallpaperManager;
import android.content.Intent;
import android.content.pm.ActivityInfo;
import android.graphics.Point;
import android.graphics.Typeface;
import android.net.Uri;
import android.os.Bundle;
import android.os.Parcelable;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.PagerTitleStrip;
import android.support.v4.view.ViewPager;
import android.text.method.ScrollingMovementMethod;
import android.util.DisplayMetrics;
import android.view.Display;
import android.view.Gravity;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.Toast;
import android.view.View.OnClickListener;
public class MainActivity extends Activity {
private int currentPage;
private static int NUM_VIEWS = 53;
Dialog dialog;
private MyPagerAdapter adapter;
private ViewPager pager;
private int[] pics = { R.drawable.casapoporului2, R.drawable.transfagarasan,
R.drawable.transalpina, R.drawable.balealac,
R.drawable.barajulsiriu, R.drawable.bisericadesublac,
R.drawable.canionulscari, R.drawable.cascadacailor,
R.drawable.cascadaciucas, R.drawable.castelulbran,
R.drawable.castelulcorvinilor, R.drawable.castelulkaroly,
R.drawable.castelulpeles, R.drawable.castelulsturdza,
R.drawable.castelulhuniazilor, R.drawable.castrulroman,
R.drawable.cazaneledunarii, R.drawable.cazinoulconstanta,
R.drawable.cetateabastionara, R.drawable.cetateafagaras,
R.drawable.cetateaprejmer, R.drawable.cheilebicazului,
R.drawable.cheileturzii, R.drawable.centrulvechi,
R.drawable.cimitirulsapanta, R.drawable.colibita,
R.drawable.deltadunarii, R.drawable.epavacostinesti,
R.drawable.focurilevii, R.drawable.hanulancutei,
R.drawable.insulaovidiu, R.drawable.laculalbastru,
R.drawable.laculana, R.drawable.laculbeului,
R.drawable.laculbucura, R.drawable.laculcapra,
R.drawable.laculrosu, R.drawable.laculvidra,
R.drawable.laculvulturilor, R.drawable.mocanita,
R.drawable.parculcraiova, R.drawable.parcultimisoara,
R.drawable.pesteraghetarul, R.drawable.pesteraursilor,
R.drawable.piatabrasov, R.drawable.poduldumnezeu,
R.drawable.salinapraid, R.drawable.salinaturda,
R.drawable.shighisoara, R.drawable.sarmisegetuzaregia,
R.drawable.sfinxulbucegi, R.drawable.sibiu,
R.drawable.vulcaniinoroiosi };
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
adapter = new MyPagerAdapter();
pager = (ViewPager) findViewById(R.id.myviewpager);
pager.setAdapter(adapter);
PagerTitleStrip pagerTitleStrip = (PagerTitleStrip) findViewById(R.id.titlestrip);
}
private class MyPagerAdapter extends PagerAdapter {
protected static final int SCREEN_WIDTH = 0;
protected static final int SCREEN_HEIGHT = 0;
String[] title = { "Casa poporului", "Transfagarasan", "Transalpina",
"Balea Lac", "Barajul Siriu", "Biserica de sub lac",
"Canionul Sapte scari", "Cascada Cailor", "Cascada Ciucas",
"Castelul Bran", "Castelul Corvinilor", "Castelul Karoly",
"Castelul Peles", "Castelul Sturdza", "Castelul Huniazilor",
"Castelul Roman", "Cazanele Dunarii", "Cazinoul din Constanta",
"Cetatea Bastioara", "Cetatea Fagaras",
"Biserica fortificata de la Prejmer", "Cheile Bicazului",
"Cheile Turzii", "Centrul istoric din Bucuresti",
"Cimitirul vesel din Sapanta", "Lacul Colibita",
"Delta Dunarii", "Epava din Costinesti", "Focurile Vii",
"Hanul Ancutei", "Insula Ovidiu", "Lacul Albastru",
"Lacul Sfanta Ana", "Lacul ochiul Beiului", "Lacul Bucura",
"Lacul Capra", "Lacul Rosu", "Lacul Vidra", "Lacul Vulturilor",
"Mocanita din Maramures", "Parcul Nicolae Romanov din Craiova",
"Piata Operei din Timisoara", "Pestera Scarisoara",
"Pestera Ursilor", "Piata Sfatului din Brasov",
"Podul lui Dumnezeu", "Salina Praid", "Salina Turda",
"Cetatea Sighisoara", "Cetatea Sarmizegetusa",
"Sfinxul din Bucegi", "Piata mare din Sibiu",
"Vulcanii Noroiosi" };
@Override
public CharSequence getPageTitle(int position) {
return title[position];
}
@Override
public int getCount() {
return NUM_VIEWS;
}
/**
* Create the page for the given position. The adapter is responsible
* for adding the view to the container given here, although it only
* must ensure this is done by the time it returns from
* {@link #finishUpdate()}.
*
* @param container
* The containing View in which the page will be shown.
* @param position
* The page position to be instantiated.
* @return Returns an Object representing the new page. This does not
* need to be a View, but can be some other container of the
* page.
*/
@Override
public Object instantiateItem(View collection, final int position) {
ImageView view = new ImageView(MainActivity.this);
view.setImageResource(pics[position]);
final ImageView img4 = (ImageView) findViewById(R.id.imageView4);
img4.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent g1 = new Intent(MainActivity.this, Galerie.class);
startActivity(g1);
}
});
final ImageView img6 = (ImageView) findViewById(R.id.imageView6);
img6.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent r = new Intent(MainActivity.this, Romania.class);
startActivity(r);
}
});
final ImageView img3 = (ImageView) findViewById(R.id.imageView3);
img3.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
WallpaperManager myWallpaperManager = WallpaperManager
.getInstance(getApplicationContext());
Display display = getWindowManager().getDefaultDisplay();
Point size = new Point();
display.getSize(size);
int width = size.x;
int height = size.y;
myWallpaperManager.getDesiredMinimumWidth();
myWallpaperManager.getDesiredMinimumHeight();
try {
myWallpaperManager.setResource(position);
Toast.makeText(getApplicationContext(),
"Wallpaper-ul a fost setat cu succes!",
Toast.LENGTH_LONG).show();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
final ImageView img2 = (ImageView) findViewById(R.id.imageView2);
img2.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
switch (position) {
case 1:
Intent m1 = new Intent(MainActivity.this, Maps.class);
startActivity(m1);
break;
case 2:
Intent i2 = new Intent(MainActivity.this, Romania.class);
startActivity(i2);
break;
default:
break;
}
}
});
final ImageView img = (ImageView) findViewById(R.id.imageView1);
img.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
switch (position) {
case 1:
dialog = new Dialog(MainActivity.this);
dialog.setContentView(R.layout.dialog1);
Button btnSave = (Button) dialog
.findViewById(R.id.button1);
btnSave.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
dialog.dismiss();
}
});
dialog.show();
break;
case 2:
Intent i2 = new Intent(MainActivity.this, Romania.class);
startActivity(i2);
break;
default:
break;
}
}
});
final ImageView img5 = (ImageView) findViewById(R.id.imageView5);
img5.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent i = new Intent(Intent.ACTION_SEND);
i.setType("message/rfc822");
i.putExtra(Intent.EXTRA_EMAIL,
new String[] { "[email protected]" });
i.putExtra(Intent.EXTRA_SUBJECT, "");
i.putExtra(Intent.EXTRA_TEXT, "");
try {
startActivity(Intent
.createChooser(i,
"Trimite-mi un email cu parerea ta. Multumesc !"));
} catch (android.content.ActivityNotFoundException ex) {
}
}
});
((ViewPager) collection).addView(view, 0);
return view;
}
/**
* Remove a page for the given position. The adapter is responsible for
* removing the view from its container, although it only must ensure
* this is done by the time it returns from {@link #finishUpdate()}.
*
* @param container
* The containing View from which the page will be removed.
* @param position
* The page position to be removed.
* @param object
* The same object that was returned by
* {@link #instantiateItem(View, int)}.
*/
@Override
public void destroyItem(View collection, int position, Object view) {
((ViewPager) collection).removeView((ImageView) view);
}
@Override
public boolean isViewFromObject(View view, Object object) {
return view == ((ImageView) object);
}
/**
* Called when the a change in the shown pages has been completed. At
* this point you must ensure that all of the pages have actually been
* added or removed from the container as appropriate.
*
* @param container
* The containing View which is displaying this adapter's
* page views.
*/
@Override
public void finishUpdate(View arg0) {
}
@Override
public void restoreState(Parcelable arg0, ClassLoader arg1) {
}
@Override
public Parcelable saveState() {
return null;
}
@Override
public void startUpdate(View arg0) {
}
}
}
尝试使用页面更改侦听器：
pager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
@Override
public void onPageSelected(int position) {
}
});
编辑：
请注意，viewpager的初始位置不是1，实际上是0。因此，将currentPage初始化为1：
private int currentPage = 1;
在pageChangeListener中执行以下操作：
pager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
@Override
public void onPageSelected(int position) {
currentPage = position + 1;
}
});
现在，您将currentPage在onClickListeners内部使用，例如：
final ImageView img2 = (ImageView) findViewById(R.id.imageView2);
img2.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
switch (currentPage) {
case 1:
Intent m1 = new Intent(ScrollImageActivity.this, Maps.class);
startActivity(m1);
break;
case 2:
Intent i2 = new Intent(ScrollImageActivity.this, Romania.class);
startActivity(i2);
break;
default:
break;
}
}
});
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