Android實現(xiàn)動態(tài)向Gallery中添加圖片及倒影與3D效果示例

更新時間：2016年08月16日 09:35:11 作者：llyofdream

這篇文章主要介紹了Android實現(xiàn)動態(tài)向Gallery中添加圖片及倒影與3D效果的方法,涉及Android針對圖片的加載、顯示、翻轉、倒影等相關特效功能實現(xiàn)技巧

本文實例講述了Android實現(xiàn)動態(tài)向Gallery中添加圖片及倒影與3D效果的方法。分享給大家供大家參考，具體如下：

在Android中gallery可以提供一個很好的顯示圖片的方式，實現(xiàn)上面的效果以及動態(tài)添加數(shù)據庫或者網絡上下載下來的圖片資源。我們首先實現(xiàn)一個自定義的Gallery類。

MyGallery.java：

package nate.android.Service;
import android.content.Context;
import android.graphics.Camera;
import android.graphics.Matrix;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.view.View;
import android.view.animation.Transformation;
import android.widget.Gallery;
import android.widget.ImageView;
import android.widget.Toast;
publicclass MyGallery extends Gallery {
private Camera mCamera =new Camera();
privateint mMaxRotationAngle =45;
privateint mMaxZoom =-120;
privateint mCoveflowCenter;
public MyGallery(Context context) {
super(context);
this.setStaticTransformationsEnabled(true);
 }
public MyGallery(Context context, AttributeSet attrs) {
super(context, attrs);
this.setStaticTransformationsEnabled(true);
 }
public MyGallery(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
this.setStaticTransformationsEnabled(true);
 }
publicint getMaxRotationAngle() {
return mMaxRotationAngle;
 }
publicvoid setMaxRotationAngle(int maxRotationAngle) {
   mMaxRotationAngle = maxRotationAngle;
 }
publicint getMaxZoom() {
return mMaxZoom;
 }
publicvoid setMaxZoom(int maxZoom) {
   mMaxZoom = maxZoom;
 }
privateint getCenterOfCoverflow() {
return (getWidth() - getPaddingLeft() - getPaddingRight()) /2
+ getPaddingLeft();
 }
privatestaticint getCenterOfView(View view) {
return view.getLeft() + view.getWidth() /2;
 }
protectedboolean getChildStaticTransformation(View child, Transformation t) {
finalint childCenter = getCenterOfView(child);
finalint childWidth = child.getWidth();
int rotationAngle =0;
   t.clear();
   t.setTransformationType(Transformation.TYPE_MATRIX);
if (childCenter == mCoveflowCenter) {
     transformImageBitmap((ImageView) child, t, 0);
   } else {
     rotationAngle = (int) (((float) (mCoveflowCenter - childCenter) / childWidth) * mMaxRotationAngle);
if (Math.abs(rotationAngle) > mMaxRotationAngle) {
       rotationAngle = (rotationAngle <0) ?-mMaxRotationAngle
           : mMaxRotationAngle;
     }
     transformImageBitmap((ImageView) child, t, rotationAngle);
   }
returntrue;
 }
protectedvoid onSizeChanged(int w, int h, int oldw, int oldh) {
   mCoveflowCenter = getCenterOfCoverflow();
super.onSizeChanged(w, h, oldw, oldh);
 }
privatevoid transformImageBitmap(ImageView child, Transformation t,
int rotationAngle) {
   mCamera.save();
final Matrix imageMatrix = t.getMatrix();
finalint imageHeight = child.getLayoutParams().height;
finalint imageWidth = child.getLayoutParams().width;
finalint rotation = Math.abs(rotationAngle);
// 在Z軸上正向移動camera的視角，實際效果為放大圖片。
// 如果在Y軸上移動，則圖片上下移動；X軸上對應圖片左右移動。
   mCamera.translate(0.0f, 0.0f, 100.0f);
// As the angle of the view gets less, zoom in
if (rotation < mMaxRotationAngle) {
float zoomAmount = (float) (mMaxZoom + (rotation *1.5));
     mCamera.translate(0.0f, 0.0f, zoomAmount);
   }
// 在Y軸上旋轉，對應圖片豎向向里翻轉。
// 如果在X軸上旋轉，則對應圖片橫向向里翻轉。
   mCamera.rotateY(rotationAngle);
   mCamera.getMatrix(imageMatrix);
   imageMatrix.preTranslate(-(imageWidth /2), -(imageHeight /2));
   imageMatrix.postTranslate((imageWidth /2), (imageHeight /2));
   mCamera.restore();
 }
}

在布局文件中

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:orientation="vertical"
 android:layout_width="fill_parent"
 android:layout_height="fill_parent"
 android:background="#ffffff"
>
<LinearLayout
android:layout_width="fill_parent" android:layout_height="wrap_content"
 android:orientation="vertical" android:paddingTop="10px"
>
<LinearLayout
android:layout_width="fill_parent" android:layout_height="wrap_content"
 android:orientation="horizontal"
>
<TextView
android:layout_width="wrap_content" android:layout_height="wrap_content"
 android:id="@+id/dishName"   android:textSize="18pt"
 android:text="菜名"
/>
<LinearLayout
android:layout_width="fill_parent" android:layout_height="wrap_content"
 android:orientation="horizontal" android:paddingLeft="10px"
>
<TextView
android:layout_width="wrap_content" android:layout_height="wrap_content"
 android:id="@+id/ds"   android:textSize="18pt"
 android:text="評分 : "
/>
<RatingBar
android:numStars="5" android:rating="3"
 android:stepSize="0.2" android:layout_width="wrap_content"
 android:layout_height="wrap_content" android:isIndicator="true"
 android:id="@+id/dishScores" style="?android:attr/ratingBarStyleSmall"
/>
</LinearLayout>
</LinearLayout>
<LinearLayout
android:layout_width="fill_parent" android:layout_height="wrap_content"
 android:orientation="horizontal"
>
<TextView
android:layout_width="fill_parent" android:layout_height="wrap_content"
 android:id="@+id/dishPrice" android:text="價格" android:textSize="18pt"
/>
</LinearLayout>
</LinearLayout>
<nate.android.Service.MyGallery
android:id="@+id/Gallery01"
 android:layout_width="fill_parent"
 android:layout_height="wrap_content"
 android:layout_centerInParent="true"
/>
<TextView
android:text="\n\n\n\n這里是關于每一道菜的信息,點擊圖片進入評論"
 android:layout_width="fill_parent"
 android:layout_height="wrap_content"
 android:layout_below="@+id/gallery01"
 android:paddingLeft="5px"
 android:id="@+id/showHint"
/>
</LinearLayout>

在上面的XML文件中，我們使用了自定義的MyGallery。

然后頂一個ImageAdapter類繼承自BaseAdapter。

package nate.android.Service;
import java.util.ArrayList;
import android.content.Context;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.LinearGradient;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.PorterDuffXfermode;
import android.graphics.Bitmap.Config;
import android.graphics.PorterDuff.Mode;
import android.graphics.Shader.TileMode;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
publicclass ImageAdapter extends BaseAdapter {
int mGalleryItemBackground;
private Context mContext;
private ArrayList<byte[]> dishImages =new ArrayList<byte[]>();
private ImageView[] mImages;
public ImageAdapter(Context c,ArrayList<byte[]> tmpDishImages) {
  mContext = c;
  dishImages = tmpDishImages;
  mImages =new ImageView[dishImages.size()];
 }
publicboolean createReflectedImages() {
finalint reflectionGap =4;
int index =0;
  System.out.println("dishImages size "+ dishImages.size());
for (int i =0; i < dishImages.size(); ++i ) {
   System.out.println("dishImage --- "+ dishImages.get(i));
   Bitmap originalImage = BitmapFactory.decodeByteArray(dishImages.get(i), 0, dishImages.get(i).length);
int width = originalImage.getWidth();
int height = originalImage.getHeight();
   Matrix matrix =new Matrix();
   matrix.preScale(1, -1);
   Bitmap reflectionImage = Bitmap.createBitmap(originalImage, 0,
     height /2, width, height /2, matrix, false);
   Bitmap bitmapWithReflection = Bitmap.createBitmap(width,
     (height + height /2), Config.ARGB_8888);
   Canvas canvas =new Canvas(bitmapWithReflection);
   canvas.drawBitmap(originalImage, 0, 0, null);
   Paint deafaultPaint =new Paint();
   canvas.drawRect(0, height, width, height + reflectionGap,
     deafaultPaint);
   canvas.drawBitmap(reflectionImage, 0, height + reflectionGap, null);
   Paint paint =new Paint();
   LinearGradient shader =new LinearGradient(0, originalImage
     .getHeight(), 0, bitmapWithReflection.getHeight()
+ reflectionGap, 0x70ffffff, 0x00ffffff, TileMode.CLAMP);
   paint.setShader(shader);
   paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));
   canvas.drawRect(0, height, width, bitmapWithReflection.getHeight()
+ reflectionGap, paint);
   ImageView imageView =new ImageView(mContext);
   imageView.setImageBitmap(bitmapWithReflection);
//   imageView.setLayoutParams(new GalleryFlow.LayoutParams(180, 240));
   imageView.setLayoutParams(new MyGallery.LayoutParams(270, 360));
//imageView.setScaleType(ScaleType.MATRIX);
   mImages[index++] = imageView;
  }
returntrue;
 }
private Resources getResources() {
returnnull;
 }
publicint getCount() {
return dishImages.size();
 }
public Object getItem(int position) {
return position;
 }
publiclong getItemId(int position) {
return position;
 }
public View getView(int position, View convertView, ViewGroup parent) {
return mImages[position];
 }
publicfloat getScale(boolean focused, int offset) {
return Math.max(0, 1.0f/ (float) Math.pow(2, Math.abs(offset)));
 }
}

在這個類中構造函數(shù)需要傳入將要在gallery中繪制的圖片數(shù)據，（以byte[]類型的為例，因為我在存入sqlite以及從從網絡下載下來的圖片demo中都將其轉成byte[]），同樣我們使用

復制代碼代碼如下:

Bitmap originalImage = BitmapFactory.decodeByteArray(dishImages.get(i), 0, dishImages.get(i).length);

在這篇文章有較詳細的說明：http://www.dbjr.com.cn/article/88588.htm

將byte[]類型的圖片數(shù)據“還原”。byte[]類型的圖片源數(shù)據保存在一個ArrayList<byte[]>當中。這樣我們?yōu)閯討B(tài)的實現(xiàn)在gallery中添加圖片提供數(shù)據來源。

在下面的activity中使用我們自定義的baseAdapter以及Gallery。實現(xiàn)上圖顯示的效果。

使用實例類

package com.nate.wte2;
import java.io.IOException;
import java.util.ArrayList;
import nate.InfoService.DishInfo;
import nate.InfoService.StoreInfoService;
import nate.InfoService.WhichChoice;
import nate.NetConnection.GetConnectionSock;
import nate.android.Service.GalleryFlow;
import nate.android.Service.ImageAdapter;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.widget.AdapterView;
import android.widget.RatingBar;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.AdapterView.OnItemSelectedListener;
import com.nate.wte.LocalSql.StoresInfoDB;
publicclass DishMenuActivity extends Activity {
private ArrayList<DishInfo> dishInfoList =new ArrayList<DishInfo>();
private TextView dishName;
private RatingBar dishScores;
private TextView dishPrice;
//3:send the dish's whole info to fill the activity(send the comments of the dish)
privateint flag3 =3;
 WhichChoice choice3 =new WhichChoice(flag3);
private StoreInfoService storeInfo;
private ProgressDialog loadingDialog;
/**
  * handler handle the dialog dismission
*/
private Handler handler =new Handler(){
  @Override
publicvoid handleMessage(Message msg) {
   loadingDialog.dismiss();
//other operation
super.handleMessage(msg);
  }
 };
/**
  * thread to load the data from local database or from the server
  * @author Administrator
  *
*/
class Loading implements Runnable{
  @Override
publicvoid run() {
try {
//這兒的sleep將換成一個循環(huán)，知道某個條件滿足時候才結束循環(huán)，讓dialog終止
    Thread.sleep(1500);
    handler.sendEmptyMessage(0);
   } catch (InterruptedException e) {
    e.printStackTrace();
   }
  }
 }
/**
  * loading the items,start the thread to load
*/
publicvoid loadingItems(){
  loadingDialog = ProgressDialog.show(DishMenuActivity.this, "", "loading...");
  Thread t =new Thread(new Loading());
  t.start();
 }
publicvoid onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
  setContentView(R.layout.dishmenu_gallery);
  StoresInfoDB infoDB;
int dishInfoListLength;
  ArrayList<byte[]> dishImages =new ArrayList<byte[]>();
byte[] dishImage;
  dishName = (TextView)this.findViewById(R.id.dishName);
  dishPrice = (TextView)this.findViewById(R.id.dishPrice);
  dishScores = (RatingBar)this.findViewById(R.id.dishScores);
//得到intent中從Choices類中傳過來的對象
  Intent intent = getIntent();
  Bundle bundle = intent.getBundleExtra("bundleData");
  storeInfo = (StoreInfoService)bundle.getSerializable("storeInfo");
  dishInfoList = (ArrayList<DishInfo>)bundle.getSerializable("dishInfoList");
  System.out.println("look look the info received from Choices Activity");
for(int i =0; i < dishInfoList.size(); i++){
   System.out.println("--- "+ i + dishInfoList.get(i).getDishImage().toString());
  }
  dishInfoListLength = dishInfoList.size();
//初始化 dishImages
for(int i =0; i < dishInfoListLength; i++){
   dishImages.add(dishInfoList.get(i).getDishImage());
  }
  System.out.println("the length of the dishImages ---- "+ dishImages.size());
////////////////////////////////
//注意這里一段
////////////////////////////////
  ImageAdapter adapter =new ImageAdapter(DishMenuActivity.this,dishImages);
  adapter.createReflectedImages();
  GalleryFlow galleryFlow = (GalleryFlow) findViewById(R.id.Gallery01);
  galleryFlow.setOnItemSelectedListener(new OnItemSelectedListener(){
   @Override
publicvoid onItemSelected(AdapterView<?> arg0, View arg1,
int arg2, long arg3) {
    String showName ="菜名 : "+ dishInfoList.get((int)arg3).getDishName() +"";
    dishName.setText(showName);
    dishScores.setRating(dishInfoList.get((int)arg3).getDishScores());
    dishPrice.setText("價格 ： "+ dishInfoList.get((int)arg3).getPrice() +" 元\n\n\n");
   }
   @Override
publicvoid onNothingSelected(AdapterView<?> arg0) {
   }
  });
  galleryFlow.setOnItemClickListener(new OnItemClickListener(){
  @Override
publicvoid onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
   loadingItems();
   DishInfo dishInfo = dishInfoList.get((int)arg3);
try {
    GetConnectionSock.fromClient.writeObject(choice3);
    System.out.println("send the flag 3 ");
    GetConnectionSock.fromClient.writeObject(dishInfo);
    System.out.println("send the name back to server");
    DishInfo dishComments = (DishInfo)GetConnectionSock.fromServer.readObject();
    System.out.println("recv the dish comments");
    dishInfo.setDishName(dishInfoList.get((int)arg3).getDishName());
    dishInfo.setDishComments(dishComments.getDishComments());
    System.out.println("full the dish info");
   } catch (IOException e) {
    e.printStackTrace();
   } catch (ClassNotFoundException e) {
    e.printStackTrace();
   }
   Intent intent =new Intent();
   Bundle bundle =new Bundle();
   bundle.putSerializable("dishInfo",dishInfo);
   bundle.putSerializable("storeInfo",storeInfo);
   intent.putExtra("dishBundleData",bundle);
   intent.setClass(DishMenuActivity.this,DishInfoDynamic.class);
   Toast.makeText(DishMenuActivity.this, "進入評論此道菜",Toast.LENGTH_LONG).show();
   DishMenuActivity.this.startActivity(intent);
  }
  });
  galleryFlow.setAdapter(adapter); //注意這里
 }
}

在這個activity中跟本文相關的，也就是在galley中添加圖片功能，只需注意上面代碼中標注出來的部分代碼即可，至于數(shù)據來源得到的方式都不一樣，這里只要知道數(shù)據是一個ArrayList<byte[]>就行了。重要的是利用上面的MyGallery以及ImageAdapter，當然，通過簡單的理解，很輕松的這兩個類就能夠在其他的工程中重用的

更多關于Android相關內容感興趣的讀者可查看本站專題：《Android圖形與圖像處理技巧總結》、《Android開發(fā)入門與進階教程》、《Android調試技巧與常見問題解決方法匯總》、《Android多媒體操作技巧匯總(音頻,視頻,錄音等)》、《Android基本組件用法總結》、《Android視圖View技巧總結》、《Android布局layout技巧總結》及《Android控件用法總結》

希望本文所述對大家Android程序設計有所幫助。

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