Android实现GridView中ImageView动态变换的方法

2019-10-24 20:36:02

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这篇文章主要介绍了Android实现GridView中ImageView动态变换的方法,以实例形式较为详细的分析了GridView中ImageView动态变换的页面布局及功能实现相关技巧,需要的朋友可以参考下

本文实例讲述了Android实现GridView中ImageView动态变换的方法。分享给大家供大家参考。具体如下：

使用YY影音的时候，发现点击GridView的某一个Item，Item里面的图标会在按下的时候发生变换，变成另外一个图片。

自己写了一个类似的demo，具体步骤如下：

1、创建一个包含Grid的Acitity

2、创建item.xml 里面包含一个imageview和一个textview

3、自定义一个adapter，从baseadapter继承

4、在getView中为每个imageView添加setOnTouchListener

代码入下：

MainActivity.java

package com.mygriddemo;

import java.util.ArrayList;

import android.app.Activity;

import android.content.Context;

import android.content.Intent;

import android.content.res.Resources;

import android.graphics.drawable.Drawable;

import android.os.Bundle;

import android.util.Log;

import android.view.LayoutInflater;

import android.view.MotionEvent;

import android.view.View;

import android.view.View.OnTouchListener;

import android.view.ViewGroup;

import android.widget.AdapterView;

import android.widget.AdapterView.OnItemClickListener;

import android.widget.BaseAdapter;

import android.widget.GridView;

import android.widget.ImageButton;

import android.widget.ImageView;

import android.widget.TextView;

import android.widget.Toast;

public class MainActivity extends Activity {

/** Called when the activity is first created. */

private GridView gv;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

gv = (GridView) findViewById(R.id.mygrid);

AddAdapter addadapter = new AddAdapter(this);

gv.setAdapter(addadapter);

}

public class AddAdapter extends BaseAdapter {

private final LayoutInflater mInflater;

private final ArrayList<ListItem> mItems = new ArrayList<ListItem>();

// public static final int ITEM_SHORTCUT = 0;

// public static final int ITEM_APPWIDGET = 1;

// public static final int ITEM_LIVE_FOLDER = 2;

// public static final int ITEM_WALLPAPER = 3;

/**

* Specific item in our list.

*/

public class ListItem {

public final CharSequence text;

public final Drawable image;

//public final int actionTag;

public final Drawable touchimage;

//, int actionTag

public ListItem(Resources res, int textResourceId, int imageResourceId,int touchImageResourceId) {

text = res.getString(textResourceId);

if (imageResourceId != -1) {

image = res.getDrawable(imageResourceId);

} else {

image = null;

}

if (touchImageResourceId != -1) {

touchimage = res.getDrawable(touchImageResourceId);

} else {

touchimage = null;

}

}

}

public AddAdapter(MainActivity launcher) {

super();

mInflater = (LayoutInflater) launcher.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

// Create default actions

Resources res = launcher.getResources();

mItems.add(new ListItem(res, R.string.item1,

R.drawable.item1, R.drawable.item1back));

mItems.add(new ListItem(res, R.string.item2,

R.drawable.item2, R.drawable.item2back));

mItems.add(new ListItem(res, R.string.item3,

R.drawable.item3, R.drawable.item3back));

mItems.add(new ListItem(res, R.string.item4,

R.drawable.item4, R.drawable.item4back));

}

public View getView(int position, View convertView, ViewGroup parent) {

final ListItem item = (ListItem) getItem(position);

if (convertView == null) {

convertView = mInflater.inflate(R.layout.grid_item, parent, false);

}

final TextView textView = (TextView) convertView;//.findViewById(R.id.mygrid);

textView.setTag(item);

textView.setText(item.text);

textView.setCompoundDrawablesWithIntrinsicBounds(null, item.image, null, null);

textView.setOnTouchListener(new OnTouchListener(){

public boolean onTouch(View arg0, MotionEvent arg1) {

// TODO Auto-generated method stub

if (arg1.getAction() == MotionEvent.ACTION_DOWN){

Log.d("WeatherWidget", MotionEvent.ACTION_DOWN+"");

textView.setCompoundDrawablesWithIntrinsicBounds(null, item.touchimage, null, null);

}

else if(arg1.getAction() == MotionEvent.ACTION_UP) {

Log.d("WeatherWidget", arg1.getAction()+"");

textView.setCompoundDrawablesWithIntrinsicBounds(null, item.image, null, null);

Intent i = new Intent(MainActivity.this,Page1Activity.class);

startActivity(i);

}

return true;

}

});

return convertView;

}

public int getCount() {

return mItems.size();

}

public Object getItem(int position) {

return mItems.get(position);

}

public long getItemId(int position) {

return position;

}

}

}

main.xml代码：

<?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"

>

<GridView android:id="@+id/mygrid"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:numColumns="2"

android:verticalSpacing="10dip"

android:horizontalSpacing="10dip"

android:stretchMode="columnWidth"

android:gravity="center"

>

</GridView>

</LinearLayout>

griditem.xml代码：

<?xml version="1.0" encoding="utf-8"?>

<?xml version="1.0" encoding="utf-8"?>

<TextView xmlns:android="http://schemas.android.com/apk/res/android"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:minHeight="?android:attr/listPreferredItemHeight"

android:layout_centerHorizontal="true"

android:drawablePadding="14dip"

android:paddingLeft="15dip"

android:paddingRight="15dip"

android:gravity="center_horizontal"

/>