Отображение изображений с SD-карты в Android

который является лучшим способом для отображения изображений с SD-карты в Android? Каково использование столбца Index, курсора?

1 ответ

Попробуйте, это работает как шарм

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.os.AsyncTask;
import android.os.Bundle;
import android.provider.MediaStore;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.Toast;

import com.ijoomer.customviews.IjoomerButton;
import com.ijoomer.customviews.IjoomerCheckBox;
import com.ijoomer.src.R;

/**
 * This Class Contains All Method Related To IjoomerPhotoGalaryActivity.
 * 
 * @author tasol
 * 
 */
public class IjoomerPhotoGalaryActivity extends Activity {

 private ImageAdapter imageAdapter;

 private String[] arrPath;
 private boolean[] thumbnailsselection;
 private int ids[];
 private int count;


 /**
 * Overrides methods
 */
 @Override
 public void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.photo_gallery);

 final String[] columns = { MediaStore.Images.Media.DATA, MediaStore.Images.Media._ID };
 final String orderBy = MediaStore.Images.Media._ID;
 @SuppressWarnings("deprecation")
 Cursor imagecursor = managedQuery(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, columns, null, null, orderBy);
 int image_column_index = imagecursor.getColumnIndex(MediaStore.Images.Media._ID);
 this.count = imagecursor.getCount();
 this.arrPath = new String[this.count];
 ids = new int[count];
 this.thumbnailsselection = new boolean[this.count];
 for (int i = 0; i < this.count; i++) {
 imagecursor.moveToPosition(i);
 ids[i] = imagecursor.getInt(image_column_index);
 int dataColumnIndex = imagecursor.getColumnIndex(MediaStore.Images.Media.DATA);
 arrPath[i] = imagecursor.getString(dataColumnIndex);
 }
 GridView imagegrid = (GridView) findViewById(R.id.PhoneImageGrid);
 imageAdapter = new ImageAdapter();
 imagegrid.setAdapter(imageAdapter);
 imagecursor.close();

 final IjoomerButton selectBtn = (IjoomerButton) findViewById(R.id.selectBtn);
 selectBtn.setOnClickListener(new OnClickListener() {

 public void onClick(View v) {
 final int len = thumbnailsselection.length;
 int cnt = 0;
 String selectImages = "";
 for (int i = 0; i < len; i++) {
 if (thumbnailsselection[i]) {
 cnt++;
 selectImages = selectImages + arrPath[i] + "|";
 }
 }
 if (cnt == 0) {
 Toast.makeText(getApplicationContext(), "Please select at least one image", Toast.LENGTH_LONG).show();
 } else {

 Log.d("SelectedImages", selectImages);
 Intent i = new Intent();
 i.putExtra("data", selectImages);
 setResult(Activity.RESULT_OK, i);
 finish();
 }
 }
 });
 }
 @Override
 public void onBackPressed() {
 setResult(Activity.RESULT_CANCELED);
 super.onBackPressed();

 }

 /**
 * Class method
 */

 /**
 * This method used to set bitmap.
 * @param iv represented ImageView 
 * @param id represented id
 */

 private void setBitmap(final ImageView iv, final int id) {

 new AsyncTask<void, void,="" bitmap="">() {

 @Override
 protected Bitmap doInBackground(Void... params) {

 return MediaStore.Images.Thumbnails.getThumbnail(getApplicationContext().getContentResolver(), id, MediaStore.Images.Thumbnails.MICRO_KIND, null);
 }

 @Override
 protected void onPostExecute(Bitmap result) {
 super.onPostExecute(result);
 iv.setImageBitmap(result);
 }
 }.execute();
 }


 /**
 * List adapter
 * @author tasol
 */

 public class ImageAdapter extends BaseAdapter {
 private LayoutInflater mInflater;

 public ImageAdapter() {
 mInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
 }

 public int getCount() {
 return count;
 }

 public Object getItem(int position) {
 return position;
 }

 public long getItemId(int position) {
 return position;
 }

 public View getView(int position, View convertView, ViewGroup parent) {
 final ViewHolder holder;
 if (convertView == null) {
 holder = new ViewHolder();
 convertView = mInflater.inflate(R.layout.photo_gallery_item, null);
 holder.imageview = (ImageView) convertView.findViewById(R.id.thumbImage);
 holder.IjoomerCheckBox = (IjoomerCheckBox) convertView.findViewById(R.id.itemCheckBox);

 convertView.setTag(holder);
 } else {
 holder = (ViewHolder) convertView.getTag();
 }
 holder.IjoomerCheckBox.setId(position);
 holder.imageview.setId(position);
 holder.IjoomerCheckBox.setOnClickListener(new OnClickListener() {

 public void onClick(View v) {
 IjoomerCheckBox cb = (IjoomerCheckBox) v;
 int id = cb.getId();
 if (thumbnailsselection[id]) {
 cb.setChecked(false);
 thumbnailsselection[id] = false;
 } else {
 cb.setChecked(true);
 thumbnailsselection[id] = true;
 }
 }
 });
 holder.imageview.setOnClickListener(new OnClickListener() {

 public void onClick(View v) {
 int id = holder.IjoomerCheckBox.getId();
 if (thumbnailsselection[id]) {
 holder.IjoomerCheckBox.setChecked(false);
 thumbnailsselection[id] = false;
 } else {
 holder.IjoomerCheckBox.setChecked(true);
 thumbnailsselection[id] = true;
 }
 }
 });
 try {
 setBitmap(holder.imageview, ids[position]);
 } catch (Throwable e) {
 }
 holder.IjoomerCheckBox.setChecked(thumbnailsselection[position]);
 holder.id = position;
 return convertView;
 }
 }


 /**
 * Inner class
 * @author tasol
 */
 class ViewHolder {
 ImageView imageview;
 IjoomerCheckBox IjoomerCheckBox;
 int id;
 }

}
</void,>

photo_gallery.xml

<!--?xml version="1.0" encoding="utf-8"?-->
<relativelayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent">
 </relativelayout><button android:id="@+id/selectBtn" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Select" android:layout_alignparentbottom="true" android:layout_centerhorizontal="true" android:minwidth="200px"><code></code>


 <p> <span>photo_gallery_item.xml</span></p> <pre class="prettyprint linenums"><!--?xml version="1.0" encoding="utf-8"?-->
<relativelayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent">
 <imageview android:id="@+id/thumbImage" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerinparent="true">
 </imageview></relativelayout>

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