最蛋疼的bug：读取图片缩略图（一定要在相冊查看下形成缓存）
近期的一个连接服务端的应用。须要读取图片，一般供用户公布商品选择上传图片。初始的图片列表应该是缩略图。仅仅有确定了，才上传原图，OK不多说上代码 package edu.buaa.erhuo; import java.io.File; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import org.json.JSONArray; import org.json.JSONObject; import android.net.Uri; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.app.Activity; import android.app.AlertDialog.Builder; import android.app.ProgressDialog; import android.content.DialogInterface; import android.content.Intent; import android.view.Menu; import android.view.View; import android.view.View.OnClickListener; import android.widget.ArrayAdapter; import android.widget.Button; import android.widget.EditText; import android.widget.ImageView; import android.widget.Spinner; import android.widget.TextView; import android.widget.Toast; import edu.buaa.erhuo.R; import edu.buaa.erhuo.Utils.NetworkUtils; public class PubActivity extends Activity {private EditText et_title,et_des;private Button btn_choose,btn_addSubmit;private Spinner spinner_typeId;private ArrayAdapter<String> adapter;private List<String> allValues = new ArrayList<String>();private List<Integer> allTypeIds = new ArrayList<Integer>();private Handler handler;private ImageView photoImg;private String filePath;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_pub);et_title=(EditText)findViewById(R.id.et_title);et_des=(EditText)findViewById(R.id.et_description);btn_choose=(Button)findViewById(R.id.btn_choose_photo);btn_addSubmit=(Button)findViewById(R.id.btn_add_submit);spinner_typeId=(Spinner)findViewById(R.id.spinner_type);photoImg=(ImageView)findViewById(R.id.img_photo);handler=new Handler(){public void handleMessage(Message msg) {if (msg.what==0) {//有网络且读取到数据adapter=new ArrayAdapter<String>(PubActivity.this, android.R.layout.simple_spinner_item,allValues);adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);spinner_typeId.setAdapter(adapter);}else if (msg.what==1) {//提交到后台成功Toast.makeText(PubActivity.this,"加入成功",Toast.LENGTH_SHORT).show();et_title.setText("");et_des.setText("");spinner_typeId.setSelection(0);photoImg.setImageURI(null);filePath=null;}else if (msg.what==2) {//提交到后台失败Toast.makeText(PubActivity.this,"加入失败",Toast.LENGTH_SHORT).show();}}};// 调用工具类。 查询全部的商品分类数据Thread t=new Thread(){public void run() {try {JSONArray array=NetworkUtils.getJSONArrayByUrl(NetworkUtils.GET_ALL_PRODUCT_TYPE_URL);System.out.println(array+"kane...........");// 循环查询到的数据。保存到List集合里for (int i = 0; i < array.length(); i++) {JSONObject obj = array.getJSONObject(i);allValues.add(obj.getString("type_name"));allTypeIds.add(obj.getInt("type_id"));}handler.sendEmptyMessage(0);} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}}};t.start();btn_addSubmit.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View arg0) {final ProgressDialog dialog=new ProgressDialog(PubActivity.this);dialog.setTitle("提示");dialog.setMessage("正在提交数据.........");dialog.show();Thread t=new Thread(){public void run() {Map<String,String> params=new HashMap<String, String>();params.put("product.product_name",et_title.getText().toString());params.put("product.description",et_des.getText().toString());params.put("product.type_id", allTypeIds.get(spinner_typeId.getSelectedItemPosition()).toString());if (filePath==null) {try {String result=NetworkUtils.postDataByUrl(NetworkUtils.PRODUCT_INSERT_URL, params);if (result.equals("ok")) {handler.sendEmptyMessage(1);}else {handler.sendEmptyMessage(2);}} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();handler.sendEmptyMessage(2);}}else {try {String result = NetworkUtils.postFileByUrl(NetworkUtils.PRODUCT_INSERT_URL, params,filePath);if (result.equals("ok")) {handler.sendEmptyMessage(1);} else {handler.sendEmptyMessage(2);}} catch (Exception e) {e.printStackTrace();handler.sendEmptyMessage(2);}}dialog.dismiss();}};t.start();}});btn_choose.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View arg0) {Builder builder=new Builder(PubActivity.this);builder.setTitle("请选择");builder.setItems(new String[]{"拍照","从相冊选择"}, new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialogInterface, int which) {switch (which) {case 0:Intent intent=new Intent(PubActivity.this,CameraActivity.class);startActivity(intent);break;case 1:Intent in = new Intent(PubActivity.this,SelectImageActivity.class);startActivityForResult(in, 1);break;}}});builder.setPositiveButton("取消",new DialogInterface.OnClickListener() {public void onClick(DialogInterface dialogInterface, int which) {// TODO Auto-generated method stub} });builder.create().show();}});} //请求的activity返回一个结果@Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data) {if (resultCode == RESULT_OK) {filePath = data.getStringExtra("filePath");photoImg.setImageURI(Uri.fromFile(new File(filePath)));}} } package edu.buaa.erhuo; import java.io.File; import java.util.HashMap; import java.util.List; import java.util.Map; import edu.buaa.erhuo.adapter.PhotoImageAdapter; import android.net.Uri; import android.os.Bundle; import android.provider.MediaStore; import android.provider.MediaStore.Images; import android.provider.MediaStore.Images.Media; import android.provider.MediaStore.Images.Thumbnails; import android.app.Activity; import android.app.AlertDialog.Builder; import android.content.DialogInterface; import android.content.DialogInterface.OnClickListener; import android.content.Intent; import android.database.Cursor; import android.view.Menu; import android.view.View; import android.widget.AdapterView; import android.widget.ImageView; import android.widget.AdapterView.OnItemClickListener; import android.widget.GridView; public class SelectImageActivity extends Activity {private GridView gridView;private PhotoImageAdapter adapter;private List<Map<String, Object>> allValues=new ArrayList<Map<String,Object>>(); @Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_select_image);gridView=(GridView)findViewById(R.id.grid);//取得数据,Thumbnails缩略图，必须先相冊查看形成缓存，不然没有缩略图Cursor c=getContentResolver().query(MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI, null,null,null,null);c.moveToFirst();while (!c.isAfterLast()) {Map<String,Object> map=new HashMap<String, Object>();//相应原图的IDmap.put("imageId",c.getLong(c.getColumnIndex(Thumbnails.IMAGE_ID)));//DATA就是路径名map.put("filepath",c.getString(c.getColumnIndex(Thumbnails.DATA)));allValues.add(map);c.moveToNext();}c.close(); adapter=new PhotoImageAdapter(allValues, this);gridView.setAdapter(adapter);gridView.setOnItemClickListener(new OnItemClickListener() {@Overridepublic void onItemClick(AdapterView<?> arg0, View arg1, int position,long arg3) {final Map<String,Object> map=allValues.get(position);Builder builder=new Builder(SelectImageActivity.this);builder.setTitle("确定使用这张好照片吗？");ImageView img=new ImageView(SelectImageActivity.this);img.setImageURI(Uri.fromFile(new File(map.get("filepath").toString())));builder.setView(img);builder.setPositiveButton("确定", new OnClickListener() {@Overridepublic void onClick(DialogInterface arg0, int arg1) {//获取图片原始位置//须要关联查询Cursor c=getContentResolver().query(Images.Media.EXTERNAL_CONTENT_URI,null,Media._ID+"= ? ", new String[]{map.get("imageId").toString()}, null);String realPath=null;if (c.moveToFirst()) {realPath=c.getString(c.getColumnIndex(Media.DATA));}c.close();Intent in=new Intent();in.putExtra("filepath",realPath);setResult(RESULT_OK,in);//给调用此activity的源头发给回馈信息finish();}});builder.setNegativeButton("取消",new OnClickListener() {@Overridepublic void onClick(DialogInterface arg0, int arg1) {// TODO Auto-generated method stub}});builder.create().show();}});} } 须要用到的adapter package edu.buaa.erhuo.adapter; import java.io.File; import java.util.List; import java.util.Map; import android.content.Context; import android.net.Uri; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.AbsListView.LayoutParams; import android.widget.BaseAdapter; import android.widget.ImageView; import edu.buaa.erhuo.R; import edu.buaa.erhuo.Utils.Globals; public class PhotoImageAdapter extends BaseAdapter {private List<Map<String, Object>> allValues;private Context ctx;public PhotoImageAdapter(List<Map<String, Object>> allValues, Context ctx) {this.allValues = allValues;this.ctx = ctx;}@Overridepublic int getCount() {return allValues.size();}@Overridepublic Object getItem(int position) {return allValues.get(position);}@Overridepublic long getItemId(int position) {return position;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {if (convertView == null) {convertView = LayoutInflater.from(ctx).inflate(R.layout.grid_image_line, null);convertView.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, Globals.SCREEN_HEIGHT / 6));}Map<String, Object> map = allValues.get(position);ImageView img = (ImageView) convertView.findViewById(R.id.photo_img_line);img.setImageURI(Uri.fromFile(new File(map.get("filePath").toString())));return convertView;} } 本文转自mfrbuaa博客园博客，原文链接：http://www.cnblogs.com/mfrbuaa/p/5287369.html，如需转载请自行联系原作者
