在Android中淡入和淡入淡出的自动幻灯片使用动画仅淡入

Question

我在一个区域中遇到问题，我想在4张图片之间进行“自动幻灯片放映”（从网址中下载） 我希望淡入淡出并淡出图片之间的变化。 我唯一能做的就是幻灯片放映：

淡入图片，然后“重置”视图空白，然后淡入新图片..

而不是： 淡入图片，然后淡入新图像.. 或：淡入图片，然后在新图像中淡出然后空白..

你有什么想法吗？

这是我的代码：//我稍微减少了“获取URL位图”..

public class SliderActivity extends Activity {
	
	public int currentimageindex=0;
	Timer timer;
	TimerTask task;
	ImageView slidingimage;
	public boolean ok;
	public Bitmap bm;
	public Bitmap bm0,bm1,bm2,bm3;
	String url11 = "https://www.weblink/pic1.png"; 
	String url22 = "https://www.weblink/pic2.png";
	String url33 = "https://www.weblink/pic3.png";
	String url44 = "https://www.weblink/pic4.png";
	String[] URLlink = {url11,url22,url33,url44};
	Bitmap[] IMAGE_IDS = { bm0, bm1, bm2,bm3 };
	
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.mygame);        
        final Handler mHandler = new Handler();
        downloadPicToArray();        
        final Runnable mUpdateResults = new Runnable() {
            public void run() {
            	AnimateandSlideShowout();
            	AnimateandSlideShow();
            }
        };		
        int delay = 1; // delay.. 1 sec = 1000.
        int period = 20000; // repeat every...1 sec. (2000)
        Timer timer = new Timer();
        timer.scheduleAtFixedRate(new TimerTask() {
        public void run() {
        	 mHandler.post(mUpdateResults);
        }
        }, delay, period);
    }

    private void downloadPicToArray() {
    	try {
    		BitmapFactory.Options bmOptions;
    		bmOptions = new BitmapFactory.Options();
    		bmOptions.inSampleSize = 1;
    		bm0 = loadBitmap(URLlink[0], bmOptions);
    		bm1 = loadBitmap(URLlink[1], bmOptions);
    		bm2 = loadBitmap(URLlink[2], bmOptions);
    		bm3 = loadBitmap(URLlink[3], bmOptions);
    	}
    	catch (...){
    	}
    	IMAGE_IDS[0] = bm0;
    	IMAGE_IDS[1] = bm1;
    	IMAGE_IDS[2] = bm2;
    	IMAGE_IDS[3] = bm3;
	}

    public static Bitmap loadBitmap(String URL, BitmapFactory.Options options) {
        Bitmap bitmap = null;
        InputStream in = null;
        try {
            in = OpenHttpConnection(URL);
            bitmap = BitmapFactory.decodeStream(in, null, options);
            if (in == null){
            	bitmap = null;
            }
            in.close();
        } catch (IOException e1) {
        	bitmap = null;        	
        }
        return bitmap;
    }

    private static InputStream OpenHttpConnection(String strURL)
            throws IOException {
        InputStream inputStream = null;
        URL url = new URL(strURL);
        URLConnection conn = url.openConnection();

        try {
            HttpURLConnection httpConn = (HttpURLConnection) conn;
            httpConn.setRequestMethod("GET");
            httpConn.connect();

            if (httpConn.getResponseCode() == HttpURLConnection.HTTP_OK) {
                inputStream = httpConn.getInputStream();
            }
        } catch (Exception ex) {
        	inputStream = null;
        }
        return inputStream;
    }
    
	public void onClick(View v) {
    
        finish();
        android.os.Process.killProcess(android.os.Process.myPid());
      }
    
    private void AnimateandSlideShow() {
    	Animation rotateimage = AnimationUtils.loadAnimation(this, R.anim.custom_anim);
    	Animation fadeinimage = AnimationUtils.loadAnimation(this, R.anim.fade_in);  
    	Animation fadeoutimage = AnimationUtils.loadAnimation(this, R.anim.fade_out);    	  	
    	
    	slidingimage = (ImageView)findViewById(R.id.ImageView3_Left);
    	
    		//slidingimage.setImageResource(IMAGE_IDS[currentimageindex%IMAGE_IDS.length]);
    		slidingimage.setImageBitmap(IMAGE_IDS[currentimageindex%IMAGE_IDS.length]);
    		slidingimage.startAnimation(rotateimage);   		
    		currentimageindex++;}
    
    private void AnimateandSlideShowout() {
    	Animation fadeoutimage = AnimationUtils.loadAnimation(this, R.anim.fade_out);
    	slidingimage = (ImageView)findViewById(R.id.ImageView3_Left);
    	slidingimage.setImageResource(IMAGE_IDS[currentimageindex%IMAGE_IDS.length]);
 	slidingimage.startAnimation(fadeoutimage);
    }
    
     
    
    
}

动画就像这样：

  //fade out

  <?xml version="1.0" encoding="utf-8" ?>
  <set
  xmlns:android="http://schemas.android.com/apk/res/android"
      android:shareInterpolator="false">
      <alpha
          android:fromAlpha="1.0"
          android:toAlpha="0.0"
          android:duration="2000">
      </alpha>
  </set>


  //fade in
  <?xml version="1.0" encoding="utf-8" ?>
  <set
      xmlns:android="http://schemas.android.com/apk/res/android"            
      android:shareInterpolator="false">
      <alpha
    android:fromAlpha="0.0"
    android:toAlpha="1.0"
    android:duration="2000">
      </alpha>
  </set>