android 生成缩略图

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package com.example.ImageView;import android.app.Activity;import android.content.Context;import android.content.Intent;import android.database.Cursor;import android.net.Uri;import android.os.Bundle;import android.provider.MediaStore;import android.util.Log;import android.view.Menu;import android.view.MenuInflater;import android.view.MenuItem;import android.view.View;import android.view.ViewGroup;import android.widget.AdapterView;import android.widget.BaseAdapter;import android.widget.GridView;import android.widget.ImageView;import android.widget.AdapterView.OnItemClickListener;/** * SD 卡上显示图片 */public class MyActivity extends Activity {    /**     * Cursor used to access the results from querying for images on the SD card.     */    private Cursor cursor;    /*     * Column index for the Thumbnails Image IDs.     */    private int columnIndex;    String TAG="test";    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        // Set up an array of the Thumbnail Image ID column we want        String[] projection = {MediaStore.Images.Thumbnails._ID};        // Create the cursor pointing to the SDCard        cursor = managedQuery( MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI,                projection, // Which columns to return                null,       // Return all rows                null,                MediaStore.Images.Thumbnails.IMAGE_ID);        // Get the column index of the Thumbnails Image ID        columnIndex = cursor.getColumnIndexOrThrow(MediaStore.Images.Thumbnails._ID);        GridView sdcardImages = (GridView) findViewById(R.id.sdcard);        sdcardImages.setAdapter(new ImageAdapter(this));        // Set up a click listener        sdcardImages.setOnItemClickListener(new OnItemClickListener() {            public void onItemClick(AdapterView parent, View v, int position, long id) {                // Get the data location of the image                String[] projection = {MediaStore.Images.Media.DATA};                cursor = managedQuery( MediaStore.Images.Media.EXTERNAL_CONTENT_URI,                        projection, // Which columns to return                        null,       // Return all rows                        null,                        null);                columnIndex = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);                cursor.moveToPosition(position);                // Get image filename读取图片                Log.d(TAG,"-----------------------one------------------------");                String imagePath = cursor.getString(columnIndex);                Log.d(TAG,imagePath);//调用系统图片浏览器                Intent it = new Intent(Intent.ACTION_VIEW);                Uri mUri = Uri.parse("file://" + imagePath);                it.setDataAndType(mUri, "image/*");                startActivity(it);                // Use this path to do further processing, i.e. full screen display            }        });    }    /**     * Adapter for our image files.     */    private class ImageAdapter extends BaseAdapter {        private Context context;        public ImageAdapter(Context localContext) {            context = localContext;        }        public int getCount() {            return cursor.getCount();        }        public Object getItem(int position) {            return position;        }        public long getItemId(int position) {            return position;        }        public View getView(int position, View convertView, ViewGroup parent) {            ImageView picturesView;            if (convertView == null) {                picturesView = new ImageView(context);                // Move cursor to current position                cursor.moveToPosition(position);                // Get the current value for the requested column                int imageID = cursor.getInt(columnIndex);                // Set the content of the image based on the provided URI                picturesView.setImageURI(Uri.withAppendedPath(                        MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI, "" + imageID));                picturesView.setScaleType(ImageView.ScaleType.FIT_CENTER);                picturesView.setPadding(8, 8, 8, 8);                picturesView.setLayoutParams(new GridView.LayoutParams(100, 100));            }            else {                picturesView = (ImageView)convertView;            }            return picturesView;        }    }}
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