请参见最新的代码:
http://blog.csdn.net/lfdfhl/article/details/50900530
http://blog.csdn.net/lfdfhl/article/details/50900497
http://blog.csdn.net/lfdfhl/article/details/50900423
MainActivity如下:
package com.example.testviewpager;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.Timer;
import java.util.TimerTask;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.os.Handler;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.view.GestureDetector;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.view.ViewGroup;
import android.view.ViewGroup.LayoutParams;
import android.view.animation.Interpolator;
import android.widget.ImageView;
import android.widget.ProgressBar;
import android.widget.TextView;
/**
* Demo描述:
* ViewPager显示图片
* 要求:
* 1 图片来自于网络
* 2 ViewPager无限循环播放图片
* 3 ViewPager亦可手指滑动且与自动播放不冲突
*
* Bug描述:
* 如果图片数量小于等于三张,那么会出现以下bug：
* 当进入应用后手指立马从左往右滑动图片,此时会显示空白
* 解决办法:
* 如果图片数量小于等于三张,不执行PagerAdapter中的destroyItem()方法
*/
public class MainActivity extends Activity {
private ViewPager mViewPager;
private ArrayList<View> mSucViewPagerItemsList;
private ViewGroup mContentView, mPointsView;
private ImageView[] mPointImageViews;
private String mRawImageUrlsArray[];
private Timer mTimer;
private int mPosition = 0;
private boolean isOnCreate = true;
public int mRawImageUrlsFinishCount = 0;
private Downloader mDownloader;
private final int DOWNLOAD_FINISH = -1999;
private boolean isSuccess = true;
private ViewPagerAdapter mViewPagerAdapter;
private ProgressBar mProgressBar;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//开始进入界面的时候就显示内容
setContentView(R.layout.main);
init();
}
private void init() {
new Thread() {
public void run() {
Util.cleanCache();
initViewPagerItems();
};
}.start();
LayoutInflater inflater = this.getLayoutInflater();
mContentView = (ViewGroup) inflater.inflate(R.layout.main,null);
mPointsView = (ViewGroup) mContentView.findViewById(R.id.home_points_layout);
}
@Override
protected void onRestart() {
super.onRestart();
initTimer();
}
protected void onPause() {
super.onPause();
if (mTimer != null) {
mTimer.cancel();
mTimer = null;
}
}
Handler handler = new Handler() {
public void handleMessage(android.os.Message msg) {
if (msg.what == DOWNLOAD_FINISH) {
if (mSucViewPagerItemsList.size() != 0) {
initPointsView();
initViewPager();
initTimer();
}
//等所有东西初始化完成,再显示界面的内容
//setContentView(R.layout.main);//该句错误,应该使用下一句
setContentView(mContentView);
mProgressBar=(ProgressBar) findViewById(R.id.home_progressBar);
mProgressBar.setVisibility(View.GONE);
} else {
try {
Field mScroller;
mScroller = ViewPager.class.getDeclaredField("mScroller");
mScroller.setAccessible(true);
Field interpolator = ViewPager.class.getDeclaredField("sInterpolator");
interpolator.setAccessible(true);
FixedSpeedScroller scroller = new FixedSpeedScroller(mViewPager.getContext(),(Interpolator) interpolator.get(null));
mScroller.set(mViewPager, scroller);
} catch (Exception e) {
}
mViewPager.setCurrentItem(msg.what, true);
}
};
};
private void initViewPager() {
mViewPager = (ViewPager) mContentView.findViewById(R.id.home_viewPager);
mViewPagerAdapter=new ViewPagerAdapter(mSucViewPagerItemsList);
mViewPager.setAdapter(mViewPagerAdapter);
mViewPager.setOnPageChangeListener(new MizunoOnPageChangeListener());
final GestureDetector tapGestureDetector = new GestureDetector(this,new TapGestureListener());
mViewPager.setOnTouchListener(new OnTouchListener() {
public boolean onTouch(View v, MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_UP) {
System.out.println(" 手指抬起 ");
initTimer();
}
tapGestureDetector.onTouchEvent(event);
return false;
}
});
}
private void initTimer() {
if (isOnCreate) {
mViewPager.setCurrentItem(200 * mRawImageUrlsArray.length, true);
mPosition = (200 * mRawImageUrlsArray.length);
isOnCreate = false;
} else {
mViewPager.setCurrentItem(mPosition, true);
}
mTimer = new Timer();
mTimer.scheduleAtFixedRate(new TimerTask() {
@Override
public void run() {
mPosition++;
handler.sendEmptyMessage(mPosition);
}
}, 3000, 2000);
}
class TapGestureListener extends GestureDetector.SimpleOnGestureListener {
@Override
public boolean onSingleTapConfirmed(MotionEvent e) {
System.out.println(" TapGestureListener ");
return false;
}
@Override
public boolean onDown(MotionEvent e) {
if (mTimer != null) {
mTimer.cancel();
mTimer = null;
}
return super.onDown(e);
}
}
private void initViewPagerItems() {
View itemView = null;
ImageView imageView = null;
mSucViewPagerItemsList = new ArrayList<View>();
LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
mRawImageUrlsArray = this.getResources().getStringArray(R.array.testPathArray);
mDownloader = new Downloader(MainActivity.this);
for (int i = 0; i < mRawImageUrlsArray.length; i++) {
String path=mDownloader.download(mRawImageUrlsArray[i]);
Bitmap bitmap=null;
if (path!=null) {
bitmap = BitmapFactory.decodeFile(path);
}
if (bitmap == null) {
isSuccess = false;
} else {
isSuccess = true;
}
if (isSuccess) {
itemView = inflater.inflate(R.layout.viewpage_item, null);
imageView = (ImageView) itemView.findViewById(R.id.viewPage_item_imageView);
imageView.setImageBitmap(bitmap);
mSucViewPagerItemsList.add(itemView);
}
if (i == mRawImageUrlsArray.length - 1) {
handler.sendEmptyMessage(DOWNLOAD_FINISH);
}
}
}
/**
* Instant pointView
* */
private void initPointsView() {
mPointImageViews = new ImageView[mSucViewPagerItemsList.size()];
for (int i = 0; i < mSucViewPagerItemsList.size(); i++) {
ImageView imageView = new ImageView(MainActivity.this);
imageView.setLayoutParams(new LayoutParams(10, 10));
TextView mPointTextView = new TextView(MainActivity.this);
mPointTextView.setLayoutParams(new LayoutParams(10, 10));
imageView.setPadding(10, 0, 10, 0);
mPointImageViews[i] = imageView;
if (i == 0) {
mPointImageViews[i]
.setBackgroundResource(R.drawable.icon_current);
} else {
mPointImageViews[i]
.setBackgroundResource(R.drawable.icon_slide);
}
mPointsView.addView(mPointImageViews[i]);
if (i != mSucViewPagerItemsList.size() - 1) {
mPointsView.addView(mPointTextView);
}
}
}
// Monitor this ViewPager status change
class MizunoOnPageChangeListener implements OnPageChangeListener {
private int pointIndex;
public void onPageScrollStateChanged(int arg0) {
}
public void onPageScrolled(int arg0, float arg1, int arg2) {
}
public void onPageSelected(int currentItem) {
mPosition = currentItem;// very important
pointIndex = currentItem % mSucViewPagerItemsList.size();
for (int i = 0; i < mPointImageViews.length; i++) {
mPointImageViews[pointIndex]
.setBackgroundResource(R.drawable.icon_current);
if (pointIndex != i) {
mPointImageViews[i]
.setBackgroundResource(R.drawable.icon_slide);
}
}
}
}
protected void initPush() {}
protected void onNewIntent(Intent intent) {
super.onNewIntent(intent);
setIntent(intent);
}
@Override
protected void onResume() {
super.onResume();
// initTimer();
// this. appVisor.openTracking();
// appVisor.trackPage("夋柺侾");
}
@Override
protected void onDestroy() {
super.onDestroy();
}
}
Downloader如下:
package com.example.testviewpager;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import android.content.Context;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Environment;
public class Downloader {
private Context mContext;
private String mPath;
private Bitmap mBitamp=null;
private HttpClient mHttpClient;
private File imagesDir;
private String mDir="mizunopics";
private final String FILE_SUFFIX="mizuno";
public Downloader(Context context) {
super();
this.mContext = context;
//this.mPath = path;
if (Util.isSDCardExist()) {
String SDCardPath=Environment.getExternalStorageDirectory().toString();
imagesDir = new File(SDCardPath+ File.separator + mDir);
}
if (imagesDir != null && !imagesDir.exists()) {
Util.doMkdir(imagesDir);
}
}
public String download(String path){
this.mPath = path;
try {
File file = getFromSDcard(mPath);
if (file.exists()) {
return file.getAbsolutePath();
}else{
file.createNewFile();
mHttpClient = new DefaultHttpClient();
final HttpGet getRequest = new HttpGet(mPath);
HttpResponse httpResponse = mHttpClient.execute(getRequest);
int statusCode = httpResponse.getStatusLine().getStatusCode();
HttpEntity httpEntity = httpResponse.getEntity();
if (httpEntity != null&&statusCode==HttpStatus.SC_OK) {
InputStream inputStream = null;
long size = httpEntity.getContentLength();
inputStream = httpEntity.getContent();
saveToSDCard(mPath,inputStream, size);
System.out.println("下载完成,保存路径为:"+file.getAbsolutePath());
return file.getAbsolutePath();
}else {
return null;
}
}
} catch (Exception e) {
return null;
}finally{
if (mHttpClient != null) {
mHttpClient.getConnectionManager().shutdown();
}
}
//return null;
}
public void saveToSDCard(String url, InputStream inputStream, long size) {
OutputStream outputStream = null;
try {
if (!Util.canSave(size)) {
return ;
}
File file = getFromSDcard(url);
if (!file.exists()) {
file.createNewFile();
}
outputStream = new FileOutputStream(file);
copyStream(inputStream, outputStream);
} catch (Exception e) {
return;
} finally {
if (outputStream != null) {
try {
//outputStream.close();
//inputStream.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
public File getFromSDcard(String url) {
String fileName = getImageNameFromUrl(url);
if (imagesDir == null) {
return null;
}
File file = new File(imagesDir, fileName);
//System.out.println("getFromSDcard file.getPath()="+file.getPath());
return file;
}
private String getImageNameFromUrl(String url) {
Uri uri = Uri.parse(url);
String imageName = uri.getLastPathSegment()+FILE_SUFFIX;
return imageName;
}
private void copyStream(InputStream inputStream, OutputStream outputStream) {
final int buffer_size = 1024;
try {
byte[] bytes = new byte[buffer_size];
for (;;) {
int count = inputStream.read(bytes, 0, buffer_size);
if (count == -1)
break;
outputStream.write(bytes, 0, count);
}
} catch (Exception ex) {
}finally{
try {
inputStream.close();
outputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
FixedSpeedScroller如下:
package com.example.testviewpager;
import android.content.Context;
import android.view.animation.Interpolator;
import android.widget.Scroller;
public class FixedSpeedScroller extends Scroller {
private int mDuration = 1000;
public FixedSpeedScroller(Context context) {
super(context);
}
public FixedSpeedScroller(Context context, Interpolator interpolator) {
super(context, interpolator);
}
@Override
public void startScroll(int startX, int startY, int dx, int dy, int duration) {
// Ignore received duration, use fixed one instead
super.startScroll(startX, startY, dx, dy, mDuration);
}
@Override
public void startScroll(int startX, int startY, int dx, int dy) {
// Ignore received duration, use fixed one instead
super.startScroll(startX, startY, dx, dy, mDuration);
}
}
ViewPagerAdapter如下:
package com.example.testviewpager;
import java.util.ArrayList;
import android.os.Parcelable;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.View;
public class ViewPagerAdapter extends PagerAdapter {
private ArrayList<View> mViewPagerItemsList;
public ViewPagerAdapter(ArrayList<View> mViewPagerItemsList) {
super();
this.mViewPagerItemsList = mViewPagerItemsList;
}
@Override
public void startUpdate(View arg0) {
}
@Override
public int getCount() {
// return mViewPagerItemsList.size();
return Integer.MAX_VALUE;
}
@Override
public boolean isViewFromObject(View arg0, Object arg1) {
return arg0 == arg1;
}
@Override
public int getItemPosition(Object object) {
return super.getItemPosition(object);
}
// a page is Initialization
@Override
public Object instantiateItem(View arg0, int arg1) {
System.out.println("初始化ViewPager的第"+arg1+"个Item");
if (arg1 >= mViewPagerItemsList.size() - 1) {
int newPosition = arg1 % mViewPagerItemsList.size();
arg1 = newPosition;
} else if (arg1 < 0) {
arg1 = (-arg1) % mViewPagerItemsList.size();
}
try {
((ViewPager) arg0).addView(mViewPagerItemsList.get(arg1), 0);
} catch (Exception e) {
}
//Log.e("instantiateItem", "arg1 after == " + arg1);
return mViewPagerItemsList.get(arg1);
}
@Override
public void destroyItem(View arg0, int arg1, Object arg2) {
//Log.e("destroyItem", "arg1 before == " + arg1);
System.out.println("删除掉ViewPager的第"+arg1+"个Item");
if (arg1 >= mViewPagerItemsList.size() - 1) {
int newPosition = arg1 % mViewPagerItemsList.size();
arg1 = newPosition;
} else if (arg1 < 0) {
arg1 = (-arg1) % mViewPagerItemsList.size();
}
try {
//Log.e("destroyItem", "arg1 after == " + arg1);
if (mViewPagerItemsList.size()<4) {
System.out.println("===》没有执行destroyItem");
} else {
System.out.println("===》执行destroyItem");
((ViewPager) arg0).removeView(mViewPagerItemsList.get(arg1));
}
} catch (Exception e) {
e.printStackTrace();
}
}
@Override
public void finishUpdate(View arg0) {
}
@Override
public void restoreState(Parcelable arg0, ClassLoader arg1) {
}
@Override
public Parcelable saveState() {
return null;
}
}
Util如下:
package com.example.testviewpager;
import java.io.File;
import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.Environment;
import android.os.StatFs;
public class Util {
private static final int ERROR = -1;
public static int save_dir = 1;
public static String UUID_KEY = "uuid_key";
public static String CONFIG = "config_file";
public static String imagesDir="mizunopics";
public static void cleanCache() {
String SDCardPath=Environment.getExternalStorageDirectory().toString();
File cacheFile=new File(SDCardPath+ File.separator + imagesDir);
if (cacheFile.exists()) {
String files[]=cacheFile.list();
File imageFile=null;
for (int i = 0; i < files.length; i++) {
imageFile=new File(cacheFile.getAbsolutePath()+File.separator+files[i]);
if (imageFile.exists()) {
System.out.println("====删除缓存图片====> path="+imageFile.getAbsolutePath());
imageFile.delete();
}
}
//cacheFile.delete();
}
}
public static boolean isNetworkAvailable(Context context) {
ConnectivityManager connm = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
if (connm == null) {
return false;
} else {
NetworkInfo[] nis = connm.getAllNetworkInfo();
if (nis != null) {
for (int i = 0; i < nis.length; i++) {
if (nis[i].getState() == NetworkInfo.State.CONNECTED) {
return true;
}
}
}
}
return false;
}
public static boolean doMkdir(File dirFile) {
try {
boolean bFile = dirFile.exists();
if (bFile == true) {
return true;
} else {
bFile = dirFile.mkdirs();
if (bFile == true) {
return true;
} else {
return false;
}
}
} catch (Exception err) {
err.printStackTrace();
return false;
}
}
public static boolean isSDCardExist() {
return android.os.Environment.getExternalStorageState().equals(
android.os.Environment.MEDIA_MOUNTED);
}
public static long getAvailableExternalMemorySize() {
if (isSDCardExist()) {
File path = Environment.getExternalStorageDirectory();
StatFs stat = new StatFs(path.getPath());
long blockSize = stat.getBlockSize();
long availableBlocks = stat.getAvailableBlocks();
return availableBlocks * blockSize;
} else {
return ERROR;
}
}
public static boolean canSave(long size) {
return getAvailableExternalMemorySize() > size;
}
}
main.xml如下:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#eee" >
<TextView
android:id="@+id/home_textView"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="完美的ViewPager"
android:textSize="25sp"
android:gravity="center" />
<RelativeLayout
android:id="@+id/home_FrameLayout"
android:layout_width="wrap_content"
android:layout_height="240dip"
android:layout_below="@id/home_textView"
android:layout_marginLeft="20dip"
android:layout_marginRight="20dip" >
<ProgressBar
android:id="@+id/home_progressBar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
/>
<android.support.v4.view.ViewPager
android:id="@+id/home_viewPager"
android:layout_width="wrap_content"
android:layout_height="240dip"
android:layout_centerHorizontal="true" />
</RelativeLayout>
<RelativeLayout
android:id="@+id/home_points_rl"
android:layout_width="fill_parent"
android:layout_height="60dip"
android:layout_below="@id/home_FrameLayout" >
<LinearLayout
android:id="@+id/home_points_layout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:orientation="horizontal" >
</LinearLayout>
</RelativeLayout>
</RelativeLayout>
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<ImageView
android:id="@+id/viewPage_item_imageView"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_centerInParent="true" />
</RelativeLayout>
