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ViewPager使用示例(二)deprecated

2013-02-25 707
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简介： 请参见最新的代码: http://blog.csdn.net/lfdfhl/article/details/50900530 http://blog.

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>


viewpage_item.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:orientation="vertical" >

    <ImageView
        android:id="@+id/viewPage_item_imageView"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true" />

</RelativeLayout>

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Android开发
数据格式
缓存
XML
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ViewPager基本用法
用法：数据ImageView+自定义适配器+ViewPager控件
格蕾修
116 0
ShaderJoy
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Java
Could not find class 'android.support.v4.view.ViewPager', referenced from method***
Could not find class 'android.support.v4.view.ViewPager', referenced from method***
ShaderJoy
162 0
Could not find class 'android.support.v4.view.ViewPager', referenced from method***
黑夜路口
ViewPager(通过反射修改viewpager切换速度)
(创建于2016/11/17) import java.lang.reflect.Field; import android.content.
黑夜路口
1128 0
技术小阿哥
The method setBackgroundDrawable(Drawable) from the type View is deprecated
技术小阿哥
1214 0
技术小胖子
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Java Android开发 容器
一个卡片式的ViewPager，带你玩转ViewPager的PageTransformer属性！
技术小胖子
1478 0
技术小美
ViewPager中使用PhotoView时出现pointerIndex out of range异常
技术小美
1444 0
技术小胖子
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容器
ViewPager 无限循环遇到的坑 viewpager.setOffscreenPageLimit(2);
技术小胖子
1656 0
紫雾凌寒
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缓存
解析ViewPager（二）——ViewPager源码解析
版权声明：本文为博主原创文章，转载请注明出处http://blog.csdn.net/u013132758。 https://blog.csdn.net/u013132758/article/details/53433565 前言 前一篇博客介绍了ViewPager的简单使用，这篇博客主要从源码的角度来解析ViewPager。
紫雾凌寒
1388 0