Android文件图片上传的详细讲解（三）---模式回调类

package com.easyway.fileupload;import android.app.Activity;import android.app.AlertDialog;import android.app.Dialog;import android.content.ContentResolver;import android.content.DialogInterface;import android.content.Intent;import android.database.Cursor;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.net.Uri;import android.os.Bundle;import android.provider.MediaStore;import android.util.Log;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.ImageView;/** * Activity 上传的界面 *  * @Title:  * @Description: 实现TODO * @Copyright:Copyright (c) 2011 * @Company:易程科技股份有限公司 * @Date:2012-7-2 * @author  longgangbai * @version 1.0 */public class AndroidUploadFilesActivity extends Activity implements OnClickListener{ private static final String TAG = "uploadImage";  private Button selectImage,uploadImage; private ImageView imageView;  private String picPath = null;     /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);                selectImage = (Button) this.findViewById(R.id.selectImage);        uploadImage = (Button) this.findViewById(R.id.uploadImage);        selectImage.setOnClickListener(this);        uploadImage.setOnClickListener(this);                imageView = (ImageView) this.findViewById(R.id.imageView);                    }     @Override public void onClick(View v) {  switch (v.getId()) {  case R.id.selectImage:   /***    * 这个是调用android内置的intent，来过滤图片文件   ，同时也可以过滤其他的      */   Intent intent = new Intent();   intent.setType("image/*");   intent.setAction(Intent.ACTION_GET_CONTENT);   //回调图片类使用的   startActivityForResult(intent, RESULT_CANCELED);   break;  case R.id.uploadImage:   if(picPath!=null&&picPath.length()>0)   {    UploadFileTask uploadFileTask=new UploadFileTask(this);    uploadFileTask.execute(picPath);   }   break;  default:   break;  } } /**  * 回调执行的方法  */ @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) {  if(resultCode==Activity.RESULT_OK)  {   /**    * 当选择的图片不为空的话，在获取到图片的途径      */   Uri uri = data.getData();   Log.e(TAG, "uri = "+ uri);   try {    String[] pojo = {MediaStore.Images.Media.DATA};        Cursor cursor = managedQuery(uri, pojo, null, null,null);    if(cursor!=null)    {     ContentResolver cr = this.getContentResolver();     int colunm_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);     cursor.moveToFirst();     String path = cursor.getString(colunm_index);     /***      * 这里加这样一个判断主要是为了第三方的软件选择，比如：使用第三方的文件管理器的话，你选择的文件就不一定是图片了，这样的话，我们判断文件的后缀名      * 如果是图片格式的话，那么才可以         */     if(path.endsWith("jpg")||path.endsWith("png"))     {      picPath = path;      Bitmap bitmap = BitmapFactory.decodeStream(cr.openInputStream(uri));      imageView.setImageBitmap(bitmap);     }else{      alert();     }    }else{     alert();    }       } catch (Exception e) {    e.printStackTrace();   }  }    /**   * 回调使用   */  super.onActivityResult(requestCode, resultCode, data); }  private void alert()    {     Dialog dialog = new AlertDialog.Builder(this)  .setTitle("提示")  .setMessage("您选择的不是有效的图片")  .setPositiveButton("确定",    new DialogInterface.OnClickListener() {     public void onClick(DialogInterface dialog,       int which) {      picPath = null;     }    })  .create();  dialog.show();    }}
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