模仿QQ滑动删除效果

最新推荐文章于 2024-04-21 11:40:39 发布

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本文介绍了一种在Android应用中实现ListView项滑动删除功能的方法。通过监听触摸事件并根据用户滑动方向来显示或隐藏删除按钮，同时提供了删除动画效果。文章详细展示了如何使用Java和Android SDK来定制ListView的行为。

有一个重大的bug,喜欢大牛能够帮忙解决一下

import java.util.ArrayList;
import java.util.List;
import android.os.Bundle;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Intent;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnTouchListener;
import android.view.ViewGroup;
import android.view.animation.Animation;
import android.view.animation.ScaleAnimation;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;
/*
 * Arrays.asList返回的List的类型是 Arrays.asList，不支持下面的方法。
 * 得到list<String> 不支持remove操作
 * 
 * 报错：*/
@SuppressLint("ShowToast")
public class MainActivity extends Activity{
	
	ScaleAnimation leftAnimation;
	ScaleAnimation rightAnimation;
	ScaleAnimation itemDelAnimation;
	
	private String[] names ={"张飞","关羽","刘备","曹操","赵云","智多星","曹冲","诸葛亮","哈士奇","詹姆斯","科比"};

	private DelAdapter delAdapter;
	private ListView listView;
	
	
	float downX =0;
	float lastMoveX = 0;
	float moveX=0;
	private List<String> list = new ArrayList<String>();
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		listView=(ListView)this.findViewById(R.id.listview);
		
//		list = Arrays.asList(names);
		
		for (int i = 0; i < names.length; i++) {
			list.add(names[i]);
		}
		
		delAdapter=new DelAdapter();
		delAdapter.setList(list);
		listView.setAdapter(delAdapter);
		
	}
	
	private void leftAnim(ViewHolder holder){
	
		leftAnimation = new ScaleAnimation(0.0f, 1.0f, 1.0f, 1.0f
				,Animation.RELATIVE_TO_SELF ,1.0f,Animation.RELATIVE_TO_SELF ,1.0f);
		leftAnimation.setDuration(300);
		leftAnimation.setFillAfter(true);
		holder.button.setAnimation(leftAnimation);
	}
	
	
	
	@SuppressWarnings("unused")
	private void rightAnim(ViewHolder holder){
		
		rightAnimation = new ScaleAnimation(1.0f, 0.0f, 1.0f, 1.0f
				,Animation.RELATIVE_TO_SELF ,1.0f,Animation.RELATIVE_TO_SELF ,1.0f);
		rightAnimation.setDuration(300);
		rightAnimation.setFillAfter(true);
		holder.button.setAnimation(rightAnimation);
	}
	
	/**
	 * item删除后动画*/
	@SuppressWarnings("unused")
	private void itemDelAnim(ViewHolder holder){
		
		itemDelAnimation = new ScaleAnimation(1.0f, 1.0f, 1.0f, 0.0f
				,Animation.RELATIVE_TO_SELF ,0.0f,Animation.RELATIVE_TO_SELF ,0.0f);
		itemDelAnimation.setDuration(300);
		itemDelAnimation.setFillAfter(true);
//		holder.rLayout.setAnimation(itemDelAnimation);
	}
	

	@SuppressWarnings("unused")
	
	private class DelAdapter extends BaseAdapter{
		private List<String> nameList;
		
		public DelAdapter(){
			nameList=new ArrayList<String>();
		}
		
		
		public void setList(List<String> nameList){
			this.nameList=nameList;
		}
		
		public void refreshData(){
			this.notifyDataSetChanged();
		}

		@Override
		public int getCount() {
			return nameList.size();
		}

		@Override
		public Object getItem(int position) {
			return nameList.get(position);
		}

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

		@Override
		public View getView(final int position, View convertView, ViewGroup parent) {
			
		    final ViewHolder holder;
		    if (convertView==null) {
				holder=new ViewHolder();
				convertView=(View)LayoutInflater.from(MainActivity.this).inflate(R.layout.itemlayout,null);
				holder.textView=(TextView)convertView.findViewById(R.id.text);
				holder.button=(Button)convertView.findViewById(R.id.button);
				
			
			    convertView.setTag(holder);
			}else {
				holder=(ViewHolder)convertView.getTag();
			}
		     
			final String name = nameList.get(position);
			holder.button.setTag(position+"");
			holder.textView.setText(name);
//			holder.textView.setTag(position+"");
			
		    holder.button.setOnClickListener(new OnClickListener() {
				
				@Override
				public void onClick(View v) {
					
					nameList.remove(position);
					listView.setTag(null);
					
					holder.button.clearAnimation();
					holder.button.setVisibility(View.GONE);
					refreshData();
				}
			});
		    
//		    holder.textView =(TextView)convertView.findViewWithTag(position+"");
		    
		    holder.textView.setOnTouchListener(new OnTouchListener() {
				
				@Override
				public boolean onTouch(View v, MotionEvent event) {
					
//					 if (holder.textView.getTag()!=null && holder.textView.getTag().equals(""+position)) {
						 switch (event.getAction()) {
							case MotionEvent.ACTION_DOWN:
							    
								downX=event.getX();
								break;
								
							case MotionEvent.ACTION_MOVE:
								
								lastMoveX=event.getX();
								moveX=lastMoveX-downX;//移动的距离（可正可负）
								break;
								
							case MotionEvent.ACTION_UP:
								
								
								if (moveX>10) {//向右滑动，隐藏删除按钮
									if ( holder.button.getTag()!=null && holder.button.getTag().equals(position+"")) {
										
										if (holder.button.getVisibility()==View.VISIBLE && listView.getTag()!=null) {
											
											holder.button.clearAnimation();
											holder.button.setVisibility(View.GONE);
											rightAnim(holder);
											listView.setTag(null);
										}
										
									}
									
									
								}else if (moveX<-10) {//向左滑动，显示删除按钮
									
									if ( holder.button.getTag()!=null && holder.button.getTag().equals(position+"")) {	
										if (holder.button.getVisibility()==View.GONE && listView.getTag()==null) {
											holder.button.clearAnimation();
											holder.button.setVisibility(View.VISIBLE);
											listView.setTag(position);//标记控件已经有显示的删除按钮
											leftAnim(holder);
										}
									}
									
								}else{
									if ((listView.getTag()==null)) {
										holder.button.clearAnimation();
										Intent intent = new Intent(MainActivity.this, OtherActivity.class);
										intent.putExtra("name", name);
										startActivity(intent);
									}
								}
								
								break;
							case MotionEvent.ACTION_CANCEL:
								Log.i("----------cancel--------", "滚动结束了");//滚动结束会调用此方法
								break;

							default:
								
								break;
							}
//					}
					
					
					
					return true;
				}
			});
		    
		    
			
			return  convertView;
		}
		
	}
	
	class ViewHolder{
		TextView textView;
		Button button;
	}
	
	
}