android - 如何从android中的图库中选择多个图像？

Question

我正在制作一个项目，我想从图库中选择多张照片并将其保存在 imageview 数组中。我能够导入单个图像并保存在 imageview谁能告诉我如何导入多个图像并保存在数组或不同的 ImageView 中？

MainActivity extends Activity implements OnClickListener {

    Button addphoto, save;
    ImageView img1[];
    Bitmap yourbitmap, resized;
    int RESULT_LOAD_IMAGE1 =1;



    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        addphoto = (Button)findViewById(R.id.add);
        img1[0] = (ImageView)findViewById(R.id.imageView1);
        save = (Button)findViewById(R.id.save);
        addphoto.setOnClickListener(this);
        save.setOnClickListener(this);
    }
@Override
    public void onClick(View arg0) {
        // TODO Auto-generated method stub
        switch(arg0.getId()){
        case R.id.add:
            Intent intent = new Intent();
            intent.setType("image/*");
            intent.setAction(Intent.ACTION_GET_CONTENT);
            startActivityForResult(Intent.createChooser(intent, "Select Picture"), RESULT_LOAD_IMAGE1);
            break;
            }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        // TODO Auto-generated method stub
        super.onActivityResult(requestCode, resultCode, data);

        if (requestCode == RESULT_LOAD_IMAGE1 && resultCode == RESULT_OK
                && null != data) {
            Uri selectedImage = data.getData();
            String[] filePathColumn = { MediaStore.Images.Media.DATA };

            Cursor cursor = getContentResolver().query(selectedImage,
                    filePathColumn, null, null, null);
            cursor.moveToFirst();

            int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
            String picturePath = cursor.getString(columnIndex);
            cursor.close();

            try {
                yourbitmap = BitmapFactory.decodeFile(picturePath);
                resized=    Bitmap.createScaledBitmap(yourbitmap, 200,300, true);


                img1[0].setImageBitmap(resized);
            } catch (Exception e) {
                e.printStackTrace();
            }

        }



    }

}

Answer 1

使用以下代码实现自定义图库选择器:

activity_main

<ScrollView
    android:layout_width="match_parent"
    android:layout_height="wrap_content" android:id="@+id/scroll1"
    >

    <LinearLayout
        android:id="@+id/lnrImages"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

    </LinearLayout>
</ScrollView>

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:id="@+id/linearLayout">
    <Button
        android:id="@+id/btnAddPhots"
        android:layout_width="0dp"
        android:layout_weight="1"
        android:layout_height="wrap_content"
        android:text="Add Phots"/>

    <Button
        android:id="@+id/btnSaveImages"
        android:layout_width="0dp"
        android:layout_weight="1"
        android:layout_height="wrap_content"
        android:text="Save"/>
</LinearLayout>

custom_gallery

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:orientation="vertical">
    <GridView
        android:id="@+id/grdImages"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:numColumns="auto_fit"
        android:verticalSpacing="10dp"
        android:horizontalSpacing="10dp"
        android:columnWidth="90dp"
        android:stretchMode="columnWidth"
        android:gravity="center"/>

    <Button
        android:id="@+id/btnSelect"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Select"
        android:layout_marginTop="5dp"/>

</LinearLayout>

custom_gallery_item

    <ImageView
        android:id="@+id/imgThumb"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

    <CheckBox
        android:id="@+id/chkImage"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="top|right"/>
</FrameLayout>

MainActivity

public class MainActivity extends Activity implements View.OnClickListener{

    private LinearLayout lnrImages;
    private Button btnAddPhots;
    private Button btnSaveImages;
    private ArrayList<String> imagesPathList;
    private Bitmap yourbitmap;
    private Bitmap resized;
    private final int PICK_IMAGE_MULTIPLE =1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        lnrImages = (LinearLayout)findViewById(R.id.lnrImages);
        btnAddPhots = (Button)findViewById(R.id.btnAddPhots);
        btnSaveImages = (Button)findViewById(R.id.btnSaveImages);
        btnAddPhots.setOnClickListener(this);
        btnSaveImages.setOnClickListener(this);
    }
    @Override
    public void onClick(View view) {
        switch (view.getId()) {
            case R.id.btnAddPhots:
                Intent intent = new Intent(MainActivity.this,CustomPhotoGalleryActivity.class);
                startActivityForResult(intent,PICK_IMAGE_MULTIPLE);
                break;
            case R.id.btnSaveImages:
                if(imagesPathList !=null){
                    if(imagesPathList.size()>1) {
                        Toast.makeText(MainActivity.this, imagesPathList.size() + " no of images are selected", Toast.LENGTH_SHORT).show();
                    }else{
                        Toast.makeText(MainActivity.this, imagesPathList.size() + " no of image are selected", Toast.LENGTH_SHORT).show();
                    }
                }else{
                    Toast.makeText(MainActivity.this," no images are selected", Toast.LENGTH_SHORT).show();
                }
                break;
        }
    }
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (resultCode == RESULT_OK) {
            if(requestCode == PICK_IMAGE_MULTIPLE){
                imagesPathList = new ArrayList<String>();
                String[] imagesPath = data.getStringExtra("data").split("\\|");
                try{
                    lnrImages.removeAllViews();
                }catch (Throwable e){
                    e.printStackTrace();
                }
                for (int i=0;i<imagesPath.length;i++){
                    imagesPathList.add(imagesPath[i]);
                    yourbitmap = BitmapFactory.decodeFile(imagesPath[i]);
                    ImageView imageView = new ImageView(this);
                    imageView.setImageBitmap(yourbitmap);
                    imageView.setAdjustViewBounds(true);
                    lnrImages.addView(imageView);
                }
            }
        }

    }

}

CustomPhotoGalleryActivity

 public class CustomPhotoGalleryActivity extends Activity {

    private GridView grdImages;
    private Button btnSelect;

    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.custom_gallery);
        grdImages= (GridView) findViewById(R.id.grdImages);
        btnSelect= (Button) findViewById(R.id.btnSelect);

        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);
        }

        imageAdapter = new ImageAdapter();
        grdImages.setAdapter(imageAdapter);
        imagecursor.close();


        btnSelect.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.custom_gallery_item, null);
                holder.imgThumb = (ImageView) convertView.findViewById(R.id.imgThumb);
                holder.chkImage = (CheckBox) convertView.findViewById(R.id.chkImage);

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

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

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


    /**
     * Inner class
     * @author tasol
     */
    class ViewHolder {
        ImageView imgThumb;
        CheckBox chkImage;
        int id;
    }

}