Android实现图片预览浏览功能

1 主xml文件

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

2 主类

package com.example.b; import android.app.Activity;import android.content.Context;import android.os.Bundle;import android.view.View;import android.view.ViewGroup;import android.view.Window;import android.view.animation.AnimationUtils;import android.widget.AdapterView;import android.widget.BaseAdapter;import android.widget.Button;import android.widget.CheckBox;import android.widget.EditText;import android.widget.Gallery;import android.widget.ImageSwitcher;import android.widget.ImageView;import android.widget.TextView;import android.widget.ViewSwitcher;import android.widget.Gallery.LayoutParams;public class ImageShowActivity  extends Activity implementsAdapterView.OnItemSelectedListener, ViewSwitcher.ViewFactory {CheckBox plain_cb;CheckBox serif_cb;CheckBox italic_cb;CheckBox bold_cb;     @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        requestWindowFeature(Window.FEATURE_NO_TITLE);        setContentView(R.layout.image_show);        setTitle("ImageShowActivity");        mSwitcher = (ImageSwitcher) findViewById(R.id.switcher);        mSwitcher.setFactory(this);        mSwitcher.setInAnimation(AnimationUtils.loadAnimation(this,                android.R.anim.fade_in));        mSwitcher.setOutAnimation(AnimationUtils.loadAnimation(this,                android.R.anim.fade_out));        Gallery g = (Gallery) findViewById(R.id.gallery);        g.setAdapter(new ImageAdapter(this));        g.setOnItemSelectedListener(this);    }    public void onItemSelected(AdapterView parent, View v, int position, long id) {        mSwitcher.setImageResource(mImageIds[position]);    }    public void onNothingSelected(AdapterView parent) {    }    public View makeView() {        ImageView i = new ImageView(this);        i.setBackgroundColor(0xFF000000);        i.setScaleType(ImageView.ScaleType.FIT_CENTER);        i.setLayoutParams(new ImageSwitcher.LayoutParams(LayoutParams.FILL_PARENT,                LayoutParams.FILL_PARENT));        return i;    }    private ImageSwitcher mSwitcher;    public class ImageAdapter extends BaseAdapter {        public ImageAdapter(Context c) {            mContext = c;        }        public int getCount() {            return mThumbIds.length;        }        public Object getItem(int position) {            return position;        }        public long getItemId(int position) {            return position;        }        public View getView(int position, View convertView, ViewGroup parent) {            ImageView i = new ImageView(mContext);            i.setImageResource(mThumbIds[position]);            i.setAdjustViewBounds(true);            i.setLayoutParams(new Gallery.LayoutParams(                    LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));            i.setBackgroundResource(R.drawable.picture_frame);            return i;        }        private Context mContext;    } private Integer[] mThumbIds = {            R.drawable.sample_thumb_0, R.drawable.sample_thumb_1,            R.drawable.sample_thumb_2, R.drawable.sample_thumb_3,            R.drawable.sample_thumb_4, R.drawable.sample_thumb_5,            R.drawable.sample_thumb_6, R.drawable.sample_thumb_7};    private Integer[] mImageIds = {            R.drawable.sample_0, R.drawable.sample_1, R.drawable.sample_2,            R.drawable.sample_3, R.drawable.sample_4, R.drawable.sample_5,            R.drawable.sample_6, R.drawable.sample_7}; }

上面的主类写的过于复杂和冗余，不建议去学这个例子，仅供参考,而且项目考入了大量图片，导致项目运行起来非常缓慢，慢也不一定是图片的问题，也可能是设计的问题

3 效果图

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