ListView中的動畫

Question

我試圖在ListView的某個項目內不時動畫一個視圖。這是一個自定義的視圖，它擴展了RelativeLayout，其目的是不時從幾個來源（包括互聯網）獲取一些信息，並顯示它。 只要有新信息可用，就會以編程方式創建新的子視圖。舊視圖是在自定義視圖（RelativeLayout）外動畫的，而新視圖是動態顯示的，就像ViewFlipper的工作原理一樣。 此視圖在放置在常規佈局中時工作正常，但將其放入ListView項目時遇到問題。問題在於它在列表中的一個或兩個滾動後停止重繪自己 - 在它離開屏幕並再次返回後立即停止。動畫不再可見，只有在與列表進行交互時纔會繪製自定義視圖。 我試圖使視圖無效，無效列表和其他選項，但是，這是行不通的...

任何幫助，非常感謝。謝謝。

下面是一些類似於我爲我的自定義視圖所嘗試的確切機制的代碼（這裏我使用了ViewFlipper來檢查我的視圖是否有問題，顯然它的行爲相同，在與列表交互之後不會重繪）

package com.test.viewflipper; 

import android.app.ListActivity; 
import android.os.Bundle; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.view.ViewGroup.LayoutParams; 
import android.view.animation.Animation; 
import android.view.animation.TranslateAnimation; 
import android.widget.AbsListView; 
import android.widget.BaseAdapter; 
import android.widget.Button; 
import android.widget.TextView; 
import android.widget.ViewFlipper; 

public class ViewFlipperTestActivity extends ListActivity { 
    /** Called when the activity is first created. */ 

    private ViewFlipper viewFlipper; 
    private Animation TRANSLATE_LEFT_TO_RIGHT_VIEW_IN = new TranslateAnimation(Animation.RELATIVE_TO_SELF, -1.0f, 
     Animation.RELATIVE_TO_SELF, 0.0f, Animation.RELATIVE_TO_SELF, 0.0f, Animation.RELATIVE_TO_SELF, 0.0f); 
    private Animation TRANSLATE_LEFT_TO_RIGHT_VIEW_OUT = new TranslateAnimation(Animation.RELATIVE_TO_SELF, 0.0f, 
     Animation.RELATIVE_TO_SELF, 1.0f, Animation.RELATIVE_TO_SELF, 0.0f, Animation.RELATIVE_TO_SELF, 0.0f); 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 

    viewFlipper = new ViewFlipper(this); 
    LayoutParams params = new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT); 
    viewFlipper.setLayoutParams(new AbsListView.LayoutParams(params)); 
    viewFlipper.setInAnimation(TRANSLATE_LEFT_TO_RIGHT_VIEW_IN); 
    viewFlipper.setOutAnimation(TRANSLATE_LEFT_TO_RIGHT_VIEW_OUT); 
    for (int i = 0; i < 10; i++) { 
     Button button = new Button(getApplicationContext()); 
     button.setText("Button " + i); 
     viewFlipper.addView(button); 
    } 
    viewFlipper.setFlipInterval(1000); 
    viewFlipper.setAutoStart(true); 
    viewFlipper.startFlipping(); 

    LayoutInflater layoutInflater = (LayoutInflater) getSystemService(LAYOUT_INFLATER_SERVICE); 
    setListAdapter(new AdListAdapter(layoutInflater)); 
    } 

    private class AdListAdapter extends BaseAdapter { 

    private LayoutInflater layoutInflater; 

    public AdListAdapter(LayoutInflater layoutInflater) { 
     this.layoutInflater = layoutInflater; 
    } 

    @Override 
    public int getCount() { 
     return 10; 
    } 

    @Override 
    public Object getItem(int position) { 
     return null; 
    } 

    @Override 
    public long getItemId(int position) { 
     return 0; 
    } 

    @Override 
    public View getView(int position, View convertView, ViewGroup parent) { 
     /* return the ad container for the first position */ 
     if (position == 0) { 
     return viewFlipper; 
     } 
     else { 
     View view = layoutInflater.inflate(android.R.layout.simple_list_item_1, null); 
     TextView textView = (TextView) view.findViewById(android.R.id.text1); 
     textView.setText("Item " + position); 
     return view; 
     } 
    } 
    } 
} 

Answer 1

如果是自定義視圖，您是否嘗試過手動啓動動畫？以編程方式或通過xml創建動畫，然後使用view.startAnimation(animation)。

你也可以顯示一些代碼？

---

更新：

好吧，首先，動畫開始的每一秒。但我會建議刪除從活動的viewFlipper和重寫自定義適配器這樣：

private class AdListAdapter extends ArrayAdapter<String> { 

private ViewFlipper viewFlipper; 
private LayoutInflater layoutInflater; 

public AdListAdapter(Context context) { 
    super(context, android.R.layout.simple_list_item_1, android.R.id.text1); 
    // NOTE: This should be done with an xml 
    viewFlipper = new ViewFlipper(context); 
    LayoutParams params = new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT); 
    viewFlipper.setLayoutParams(new AbsListView.LayoutParams(params)); 
    viewFlipper.setInAnimation(TRANSLATE_LEFT_TO_RIGHT_VIEW_IN); 
    viewFlipper.setOutAnimation(TRANSLATE_LEFT_TO_RIGHT_VIEW_OUT); 
    viewFlipper.setFlipInterval(1000); 
    for (int i = 0; i < 10; i++) { 
    Button button = new Button(getApplicationContext()); 
    button.setText("Button " + i); 
    viewFlipper.addView(button); 
    // add an item to the adapter 
    add("Item " + i); 
    } 
} 

@Override 
public View getView(int position, View convertView, ViewGroup parent) { 
    if (position == 0) { 
    // check if it's flipping 
    if(!viewFlipper.isFlipping()) { 
     viewFlipper.startFlipping(); 
    } 
    return viewFlipper; 
    } else if(convertView == viewFlipper) { 
    // makes sure that the flipping is stopped when the viewFlipper is reused 
    if(viewFlipper.isFlipping()) { 
     viewFlipper.stopFlipping(); 
    } 
    convertView = null; 
    } 
    return super.getView(position, convertView, parent); 
} 
} 

，然後創建它使用：

setListAdapter(new AdListAdapter(this)); 

我沒有測試它，但它可能這個工作方式除了簡化的看法