按钮单击时调用以下方法。活动必须在创建时加载SD卡图像。但是当我运行它时会给出零点异常。即使我使用INTERNAL_CONTENT_URI，该应用程序显示为空白。请帮帮我。
package com.example.sampleapp;
import android.content.Context;
import android.content.Intent;
import android.content.res.Resources;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.provider.MediaStore.Images.Media;
import android.util.SparseBooleanArray;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.TextView;
import com.example.sampleapp.MultiPhotoSelectActivity.Album;
import com.nostra13.universalimageloader.core.DisplayImageOptions;
import com.nostra13.universalimageloader.core.DisplayImageOptions.Builder;
import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.listener.SimpleImageLoadingListener;
import java.io.PrintStream;
import java.util.ArrayList;
import java.util.HashSet;
public class MultiPhotoSelectActivity extends BaseActivity {
private AlbumAdapter albumAdapter;
Button done;
private GridView gridView;
private ImageAdapter imageAdapter;
private ArrayList<String> imageUrls;
private boolean isAlbumView;
private ArrayList mAlbumsList;
private DisplayImageOptions options;
@SuppressWarnings("deprecation")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_multi_photo_select);
fillAlbums();
this.options = new DisplayImageOptions.Builder().showStubImage(R.drawable.ic_gallery).showImageForEmptyUri(R.drawable.ic_gallery).cacheInMemory().cacheOnDisc().build();
this.albumAdapter = new AlbumAdapter(this.mAlbumsList);
this.gridView = ((GridView)findViewById(R.id.gridview));
this.done = ((Button)findViewById(R.id.done));
this.gridView.setAdapter(this.albumAdapter);
this.gridView.setOnItemClickListener(new AdapterView.OnItemClickListener()
{
public void onItemClick(AdapterView<?> paramAnonymousAdapterView, View paramAnonymousView, int paramAnonymousInt, long paramAnonymousLong)
{
if (MultiPhotoSelectActivity.this.isAlbumView)
{
MultiPhotoSelectActivity.this.isAlbumView = false;
MultiPhotoSelectActivity.this.fillGallery(((MultiPhotoSelectActivity.Album)MultiPhotoSelectActivity.this.mAlbumsList.get(paramAnonymousInt)).albumId);
}
}
});
this.done.setOnClickListener(new View.OnClickListener()
{
public void onClick(View paramAnonymousView)
{
ArrayList<String> localArrayList = MultiPhotoSelectActivity.this.imageAdapter.getCheckedItems();
Intent localIntent = new Intent(MultiPhotoSelectActivity.this, CreateSlideActivity.class);
localIntent.putExtra("list", localArrayList);
System.out.println(" " + localArrayList);
MultiPhotoSelectActivity.this.setResult(-1, localIntent);
MultiPhotoSelectActivity.this.finish();
}
});
}
private void fillAlbums()
{
this.isAlbumView = true;
this.mAlbumsList = new ArrayList();
String[] arrayOfString = { "_data", "_id", "bucket_display_name", "bucket_id" };
Cursor localCursor = managedQuery(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, arrayOfString, null, null, null);
HashSet<String> localHashSet = new HashSet<String>();
for (int i = 0;; i++)
{
if (i >= localCursor.getCount()) {
return;
}
Album localAlbum = new Album();
localCursor.moveToPosition(i);
int j = localCursor.getColumnIndex("_data");
int k = localCursor.getColumnIndex("bucket_display_name");
int m = localCursor.getColumnIndex("bucket_id");
localCursor.getColumnIndex("_id");
String str = localCursor.getString(k);
localAlbum.setAlbumName(str);
localAlbum.setImageUrl(localCursor.getString(j));
localAlbum.albumId = localCursor.getString(m);
if (localHashSet.add(str)) {
this.mAlbumsList.add(localAlbum);
}
System.out.println("=====> BUCKET_DISPLAY_NAME => " + localCursor.getString(localCursor.getColumnIndex("bucket_display_name")));
}
}
private void fillGallery(String paramString)
{
String[] arrayOfString = { "_data", "_id" };
//String path= Environment.getExternalStorageDirectory();
Cursor localCursor = managedQuery(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, arrayOfString, "bucket_id=?", new String[] { paramString }, "datetaken DESC");
this.imageUrls = new ArrayList<String>();
for (int i = 0;; i++)
{
if (i >= localCursor.getCount())
{
this.imageAdapter = new ImageAdapter(this.imageUrls);
this.gridView.setAdapter(this.imageAdapter);
return;
}
localCursor.moveToPosition(i);
int j = localCursor.getColumnIndex("_data");
this.imageUrls.add(localCursor.getString(j));
}
}
public void onBackPressed()
{
if (this.isAlbumView)
{
super.onBackPressed();
return;
}
this.isAlbumView = true;
this.gridView.setAdapter(this.albumAdapter);
}
public class Album
{
public String albumId;
private String albumName;
private String imageUrl;
public Album() {
super();
}
public String getAlbumName()
{
return this.albumName;
}
public String getImageUrl()
{
return this.imageUrl;
}
public void setAlbumName(String paramString)
{
this.albumName = paramString;
}
public void setImageUrl(String paramString)
{
this.imageUrl = paramString;
}
}
public class AlbumAdapter
extends BaseAdapter
{
Context mContext;
ArrayList<MultiPhotoSelectActivity.Album> mList;
public AlbumAdapter(ArrayList mAlbumsList)
{
// Object localObject;
this.mList = mAlbumsList;
}
public int getCount()
{
return this.mList.size();
}
public MultiPhotoSelectActivity.Album getItem(int paramInt)
{
return (MultiPhotoSelectActivity.Album)this.mList.get(paramInt);
}
public long getItemId(int paramInt)
{
return paramInt;
}
public View getView(int paramInt, View paramView, ViewGroup paramViewGroup)
{
if (paramView == null) {
paramView = ((LayoutInflater)MultiPhotoSelectActivity.this.getSystemService("layout_inflater")).inflate(R.layout.row_album_item, null);
}
final ImageView localImageView = (ImageView)paramView.findViewById(R.id.albumview);
TextView localTextView = (TextView)paramView.findViewById(R.id.albumName);
MultiPhotoSelectActivity.this.imageLoader.displayImage("file://" + ((MultiPhotoSelectActivity.Album)this.mList.get(paramInt)).imageUrl, localImageView, MultiPhotoSelectActivity.this.options, new SimpleImageLoadingListener()
{
public void onLoadingComplete(Bitmap paramAnonymousBitmap)
{
Animation localAnimation = AnimationUtils.loadAnimation(MultiPhotoSelectActivity.this, R.anim.fade_in);
localImageView.setAnimation(localAnimation);
localAnimation.start();
}
});
localTextView.setText(((MultiPhotoSelectActivity.Album)this.mList.get(paramInt)).albumName);
return paramView;
}
}
class ImageAdapter
extends BaseAdapter
{
CompoundButton.OnCheckedChangeListener mCheckedChangeListener = new CompoundButton.OnCheckedChangeListener()
{
public void onCheckedChanged(CompoundButton paramAnonymousCompoundButton, boolean paramAnonymousBoolean)
{
MultiPhotoSelectActivity.ImageAdapter.this.mSparseBooleanArray.put(((Integer)paramAnonymousCompoundButton.getTag()).intValue(), paramAnonymousBoolean);
}
};
Context mContext;
ArrayList<String> mList;
SparseBooleanArray mSparseBooleanArray = new SparseBooleanArray();
public ImageAdapter(ArrayList<String> imageUrls)
{
// Object localObject;
this.mList = imageUrls;
}
public ArrayList<String> getCheckedItems()
{
ArrayList<String> localArrayList = new ArrayList<String>();
int i = 0;
if (i >= this.mList.size()) {
return localArrayList;
}
if (!this.mSparseBooleanArray.get(i)) {}
for (;;)
{
i++;
localArrayList.add((String)this.mList.get(i));
}
}
public int getCount()
{
return MultiPhotoSelectActivity.this.imageUrls.size();
}
public Object getItem(int paramInt)
{
return null;
}
public long getItemId(int paramInt)
{
return paramInt;
}
public View getView(int paramInt, View paramView, ViewGroup paramViewGroup)
{
if (paramView == null) {
paramView = ((LayoutInflater)MultiPhotoSelectActivity.this.getSystemService("layout_inflater")).inflate(R.layout.row_multiphoto_item, null);
}
MultiPhotoSelectActivity.this.done.setVisibility(0);
CheckBox localCheckBox = (CheckBox)paramView.findViewById(R.id.checkBox1);
final ImageView localImageView = (ImageView)paramView.findViewById(R.id.imageView2);
MultiPhotoSelectActivity.this.imageLoader.displayImage("file://" + (String)MultiPhotoSelectActivity.this.imageUrls.get(paramInt), localImageView, MultiPhotoSelectActivity.this.options, new SimpleImageLoadingListener()
{
@SuppressWarnings("unused")
public void onLoadingComplete(Bitmap paramAnonymousBitmap)
{
Animation localAnimation = AnimationUtils.loadAnimation(MultiPhotoSelectActivity.this,R.anim.fade_in );
localImageView.setAnimation(localAnimation);
localAnimation.start();
}
});
localCheckBox.setTag(Integer.valueOf(paramInt));
localCheckBox.setChecked(this.mSparseBooleanArray.get(paramInt));
localCheckBox.setOnCheckedChangeListener(this.mCheckedChangeListener);
return paramView;
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.multi_photo_select, menu);
return true;
}
}
以下是gridview的xml，其中应显示sdcard图像。
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@drawable/plainbackground"
xmlns:android="http://schemas.android.com/apk/res/android"
>
<GridView
android:gravity="center"
android:id="@+id/gridview"
android:scrollbars="vertical"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:horizontalSpacing="4.0dip"
android:verticalSpacing="2.0dip"
android:stretchMode="columnWidth"
android:columnWidth="100.0dip"
android:numColumns="auto_fit"
android:layout_weight="1.0" />
<Button
android:layout_gravity="center"
android:id="@+id/done"
android:background="@drawable/done"
android:visibility="gone"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
以下xml用于sd卡的专辑视图。
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
android:padding="10.0dip"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
xmlns:android="http://schemas.android.com/apk/res/android">
<RelativeLayout
android:id="@+id/container"
android:background="@drawable/ic_folder"
android:padding="2.0dip"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<ImageView
android:id="@+id/albumview"
android:background="@drawable/ic_folder"
android:layout_width="50.0dip"
android:layout_height="50.0dip"
android:scaleType="centerCrop"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true" />
</RelativeLayout>
<TextView
android:textSize="11.0dip"
android:textColor="@android:color/black"
android:id="@+id/albumName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="3.0dip"
android:text="Large Text"
android:layout_below="@id/container"
android:layout_centerHorizontal="true" />
</RelativeLayout>
答案 0 :(得分：0)
Intent intent = new Intent(Intent.ACTION_PICK,
android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(intent, 0);
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// TODO Auto-generated method stub
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == RESULT_OK){
Uri targetUri = data.getData();
textTargetUri.setText(targetUri.toString());
Bitmap bitmap;
try {
bitmap = BitmapFactory.decodeStream(getContentResolver().openInputStream(targetUri));
targetImage.setImageBitmap(bitmap);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}