侧滑删除进阶（一）

效果是在某个Item上右滑可以删除某个条目--效果虽然很简单，但是思路很重要

MainActivity

package com.yangfuhai.animation1;

import java.util.ArrayList;

import android.app.ListActivity;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.view.animation.Animation;
import android.view.animation.Animation.AnimationListener;
import android.view.animation.AnimationUtils;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;

public class MainActivity extends ListActivity {
	private ArrayList<String> array;
	private ArrayAdapter<String> adapter;

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		ListView listView = getListView();
		array = new ArrayList<String>();
		String aa[] = { "items1", "item2", "items3", "item4", "items5",
				"item6", "items7", "item8", "items9", "item10", "items11",
				"item12" };
		for (int i = 0; i < aa.length; i++) {
			array.add(aa[i]);
		}
		adapter = new ArrayAdapter<String>(this,
				android.R.layout.simple_list_item_1, array);
		listView.setAdapter(adapter);

		listView.setOnTouchListener(new OnTouchListener() {
			float x, y, upx, upy;

			public boolean onTouch(View view, MotionEvent event) {
				if (event.getAction() == MotionEvent.ACTION_DOWN) {
					Toast.makeText(MainActivity.this, "down", 0).show();
					x = event.getX();
					y = event.getY();
				}
				if (event.getAction() == MotionEvent.ACTION_UP) {
					Toast.makeText(MainActivity.this, "up", 0).show();
					upx = event.getX();
					upy = event.getY();
					// 我把它理解为通过x和y的位置来确定这个listView里面这个item的位置
					int position1 = ((ListView) view).pointToPosition((int) x,
							(int) y);
					int position2 = ((ListView) view).pointToPosition(
							(int) upx, (int) upy);

					if (position1 == position2 && upx > x
							&& Math.abs(x - upx) > 50) {
						View v = ((ListView) view).getChildAt(position1);
						removeListItem(v, position1);
					}
				}
				return false;
			}

		});

		listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {

			@Override
			public void onItemClick(AdapterView<?> parent, View rowView,
					int positon, long id) {
				Toast.makeText(rowView.getContext(),
						"你点击了第" + positon + "位置的item", Toast.LENGTH_SHORT)
						.show();
			}
		});
	}

	protected void removeListItem(View rowView, final int positon) {

		final Animation animation = (Animation) AnimationUtils.loadAnimation(
				rowView.getContext(), R.anim.item_anim);
		animation.setAnimationListener(new AnimationListener() {
			public void onAnimationStart(Animation animation) {
			}

			public void onAnimationRepeat(Animation animation) {
			}

			public void onAnimationEnd(Animation animation) {
				array.remove(positon);
				adapter.notifyDataSetChanged();
				animation.cancel();
			}
		});

		rowView.startAnimation(animation);

	}
}

item_anim.xml

<?xml version="1.0" encoding="utf-8"?>
<translate xmlns:android="http://schemas.android.com/apk/res/android"
    android:duration="800"
    android:fromXDelta="0"
    android:fromYDelta="0"
    android:toXDelta="800"
    android:toYDelta="0" />

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