最快的方式打开图像从画廊或相机。

原始参考:从画廊在android程序中获取图像

下面的方法将从图库或相机接收图像，并将其显示在ImageView中。所选图像将存储在内部。

XML代码

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.exampledemo.parsaniahardik.uploadgalleryimage.MainActivity">

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/btn"
        android:layout_gravity="center_horizontal"
        android:layout_marginTop="20dp"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:text="Capture Image and upload to server" />

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Below image is fetched from server"
        android:layout_marginTop="5dp"
        android:textSize="23sp"
        android:gravity="center"
        android:textColor="#000"/>

    <ImageView
        android:layout_width="300dp"
        android:layout_height="300dp"
        android:layout_gravity="center"
        android:layout_marginTop="10dp"
        android:scaleType="fitXY"
        android:src="@mipmap/ic_launcher"
        android:id="@+id/iv"/>

</LinearLayout>

JAVA类

import android.content.Intent;
import android.graphics.Bitmap;
import android.media.MediaScannerConnection;
import android.os.Environment;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;
import com.androidquery.AQuery;
import org.json.JSONException;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Calendar;
import java.util.HashMap;

public class MainActivity extends AppCompatActivity implements AsyncTaskCompleteListener{

    private ParseContent parseContent;
    private Button btn;
    private ImageView imageview;
    private static final String IMAGE_DIRECTORY = "/demonuts_upload_camera";
    private final int CAMERA = 1;
    private AQuery aQuery;

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

        parseContent = new ParseContent(this);
        aQuery = new AQuery(this);

        btn = (Button) findViewById(R.id.btn);
        imageview = (ImageView) findViewById(R.id.iv);

        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
                startActivityForResult(intent, CAMERA);
            }
        });

    }

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {

        super.onActivityResult(requestCode, resultCode, data);
        if (resultCode == this.RESULT_CANCELED) {
            return;
        }
        if (requestCode == CAMERA) {
            Bitmap thumbnail = (Bitmap) data.getExtras().get("data");
            String path = saveImage(thumbnail);
            try {
                uploadImageToServer(path);
            } catch (IOException e) {
                e.printStackTrace();
            } catch (JSONException e) {
                e.printStackTrace();
            }
        }
    }

    private void uploadImageToServer(final String path) throws IOException, JSONException {

        if (!AndyUtils.isNetworkAvailable(MainActivity.this)) {
            Toast.makeText(MainActivity.this, "Internet is required!", Toast.LENGTH_SHORT).show();
            return;
        }

        HashMap<String, String> map = new HashMap<String, String>();
        map.put("url", "https://demonuts.com/Demonuts/JsonTest/Tennis/uploadfile.php");
        map.put("filename", path);
        new MultiPartRequester(this, map, CAMERA, this);
        AndyUtils.showSimpleProgressDialog(this);
    }

    @Override
    public void onTaskCompleted(String response, int serviceCode) {
        AndyUtils.removeSimpleProgressDialog();
        Log.d("res", response.toString());
        switch (serviceCode) {

            case CAMERA:
                if (parseContent.isSuccess(response)) {
                    String url = parseContent.getURL(response);
                    aQuery.id(imageview).image(url);
                }
        }
    }

    public String saveImage(Bitmap myBitmap) {
        ByteArrayOutputStream bytes = new ByteArrayOutputStream();
        myBitmap.compress(Bitmap.CompressFormat.JPEG, 90, bytes);
        File wallpaperDirectory = new File(
                Environment.getExternalStorageDirectory() + IMAGE_DIRECTORY);
        // have the object build the directory structure, if needed.
        if (!wallpaperDirectory.exists()) {
            wallpaperDirectory.mkdirs();
        }

        try {
            File f = new File(wallpaperDirectory, Calendar.getInstance()
                    .getTimeInMillis() + ".jpg");
            f.createNewFile();
            FileOutputStream fo = new FileOutputStream(f);
            fo.write(bytes.toByteArray());
            MediaScannerConnection.scanFile(this,
                    new String[]{f.getPath()},
                    new String[]{"image/jpeg"}, null);
            fo.close();
            Log.d("TAG", "File Saved::--->" + f.getAbsolutePath());

            return f.getAbsolutePath();
        } catch (IOException e1) {
            e1.printStackTrace();
        }
        return "";
    }
}

这里有两个关于图像拾取器的有用教程，可下载源代码:

如何创建Android图像拾取器

如何在Android上选择和裁剪图像

但是，应用程序有时会被迫关闭，你可以通过添加android:configChanges属性到Manifest文件中的主活动来修复它:

<activity android:name=".MainActivity"
                  android:label="@string/app_name" android:configChanges="keyboardHidden|orientation" >

似乎相机API失去了对方向的控制，所以这将有助于它。：）

在上面代码的基础上，我反映了如下代码，可能它更适合:

public String getPath(Uri uri) {
    String selectedImagePath;
    //1:MEDIA GALLERY --- query from MediaStore.Images.Media.DATA
    String[] projection = { MediaStore.Images.Media.DATA };
    Cursor cursor = managedQuery(uri, projection, null, null, null);
    if(cursor != null){
        int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
        cursor.moveToFirst();
        selectedImagePath = cursor.getString(column_index);
    }else{
        selectedImagePath = null;
    }

    if(selectedImagePath == null){
        //2:OI FILE Manager --- call method: uri.getPath()
        selectedImagePath = uri.getPath();
    }
    return selectedImagePath;
}

public class BrowsePictureActivity extends Activity {

    // this is the action code we use in our intent, 
    // this way we know we're looking at the response from our own action
    private static final int SELECT_PICTURE = 1;

    private String selectedImagePath;

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        ((Button) findViewById(R.id.Button01))
                .setOnClickListener(new OnClickListener() {

                    public void onClick(View arg0) {

                        // in onCreate or any event where your want the user to
                        // select a file
                        Intent intent = new Intent();
                        intent.setType("image/*");
                        intent.setAction(Intent.ACTION_GET_CONTENT);
                        startActivityForResult(Intent.createChooser(intent,
                                "Select Picture"), SELECT_PICTURE);
                    }
                });
    }

    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (resultCode == RESULT_OK) {
            if (requestCode == SELECT_PICTURE) {
                Uri selectedImageUri = data.getData();
                selectedImagePath = getPath(selectedImageUri);
            }
        }
    }

    /**
     * helper to retrieve the path of an image URI
     */
    public String getPath(Uri uri) {
            // just some safety built in 
            if( uri == null ) {
                // TODO perform some logging or show user feedback
                return null;
            }
            // try to retrieve the image from the media store first
            // this will only work for images selected from gallery
            String[] projection = { MediaStore.Images.Media.DATA };
            Cursor cursor = managedQuery(uri, projection, null, null, null);
            if( cursor != null ){
                int column_index = cursor
                .getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
                cursor.moveToFirst();
                return cursor.getString(column_index);
            }
            // this is our fallback here
            return uri.getPath();
    }

}

这是我对这个主题的回顾，收集了这里的所有信息，再加上其他相关的堆栈溢出问题。它从某些提供者返回图像，同时处理内存不足的情况和图像旋转。它支持画廊，picasa和文件管理器，如下拉框。用法很简单:作为输入，构造函数接收内容解析器和uri。输出是最终的位图。

/**
 * Creates resized images without exploding memory. Uses the method described in android
 * documentation concerning bitmap allocation, which is to subsample the image to a smaller size,
 * close to some expected size. This is required because the android standard library is unable to
 * create a reduced size image from an image file using memory comparable to the final size (and
 * loading a full sized multi-megapixel picture for processing may exceed application memory budget).
 */

public class UserPicture {
    static int MAX_WIDTH = 600;
    static int MAX_HEIGHT = 800;
    Uri uri;
    ContentResolver resolver;
    String path;
    Matrix orientation;
    int storedHeight;
    int storedWidth;

    public UserPicture(Uri uri, ContentResolver resolver) {
        this.uri = uri;
        this.resolver = resolver;
    }

    private boolean getInformation() throws IOException {
        if (getInformationFromMediaDatabase())
            return true;

        if (getInformationFromFileSystem())
            return true;

        return false;
    }

    /* Support for gallery apps and remote ("picasa") images */
    private boolean getInformationFromMediaDatabase() {
        String[] fields = { Media.DATA, ImageColumns.ORIENTATION };
        Cursor cursor = resolver.query(uri, fields, null, null, null);

        if (cursor == null)
            return false;

        cursor.moveToFirst();
        path = cursor.getString(cursor.getColumnIndex(Media.DATA));
        int orientation = cursor.getInt(cursor.getColumnIndex(ImageColumns.ORIENTATION));
        this.orientation = new Matrix();
        this.orientation.setRotate(orientation);
        cursor.close();

        return true;
    }

    /* Support for file managers and dropbox */
    private boolean getInformationFromFileSystem() throws IOException {
        path = uri.getPath();

        if (path == null)
            return false;

        ExifInterface exif = new ExifInterface(path);
        int orientation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION,
                                               ExifInterface.ORIENTATION_NORMAL);

        this.orientation = new Matrix();
        switch(orientation) {
            case ExifInterface.ORIENTATION_NORMAL:
                /* Identity matrix */
                break;
            case ExifInterface.ORIENTATION_FLIP_HORIZONTAL:
                this.orientation.setScale(-1, 1);
                break;
            case ExifInterface.ORIENTATION_ROTATE_180:
                this.orientation.setRotate(180);
                break;
            case ExifInterface.ORIENTATION_FLIP_VERTICAL:
                this.orientation.setScale(1, -1);
                break;
            case ExifInterface.ORIENTATION_TRANSPOSE:
                this.orientation.setRotate(90);
                this.orientation.postScale(-1, 1);
                break;
            case ExifInterface.ORIENTATION_ROTATE_90:
                this.orientation.setRotate(90);
                break;
            case ExifInterface.ORIENTATION_TRANSVERSE:
                this.orientation.setRotate(-90);
                this.orientation.postScale(-1, 1);
                break;
            case ExifInterface.ORIENTATION_ROTATE_270:
                this.orientation.setRotate(-90);
                break;
        }

        return true;
    }

    private boolean getStoredDimensions() throws IOException {
        InputStream input = resolver.openInputStream(uri);
        Options options = new Options();
        options.inJustDecodeBounds = true;
        BitmapFactory.decodeStream(resolver.openInputStream(uri), null, options);

        /* The input stream could be reset instead of closed and reopened if it were possible
           to reliably wrap the input stream on a buffered stream, but it's not possible because
           decodeStream() places an upper read limit of 1024 bytes for a reset to be made (it calls
           mark(1024) on the stream). */
        input.close();

        if (options.outHeight <= 0 || options.outWidth <= 0)
            return false;

        storedHeight = options.outHeight;
        storedWidth = options.outWidth;

        return true;
    }

    public Bitmap getBitmap() throws IOException {
        if (!getInformation())
            throw new FileNotFoundException();

        if (!getStoredDimensions())
            throw new InvalidObjectException(null);

        RectF rect = new RectF(0, 0, storedWidth, storedHeight);
        orientation.mapRect(rect);
        int width = (int)rect.width();
        int height = (int)rect.height();
        int subSample = 1;

        while (width > MAX_WIDTH || height > MAX_HEIGHT) {
            width /= 2;
            height /= 2;
            subSample *= 2;
        }

        if (width == 0 || height == 0)
            throw new InvalidObjectException(null);

        Options options = new Options();
        options.inSampleSize = subSample;
        Bitmap subSampled = BitmapFactory.decodeStream(resolver.openInputStream(uri), null, options);

        Bitmap picture;
        if (!orientation.isIdentity()) {
            picture = Bitmap.createBitmap(subSampled, 0, 0, options.outWidth, options.outHeight,
                                          orientation, false);
            subSampled.recycle();
        } else
            picture = subSampled;

        return picture;
    }
}

引用:

http://developer.android.com/training/displaying-bitmaps/index.html 通过编程方式从Android内置的Gallery应用程序中获取/选择一张图像 在将图像加载到位图对象时出现奇怪的内存不足问题 使用ExifInterface设置图像方向 https://gist.github.com/9re/1990019 如何获得位图信息，然后解码位图从internet-inputStream?

以下是hcpl发布的优良代码的更新。但这适用于OI文件管理器，astro文件管理器和媒体库(测试)。所以我想它将适用于每个文件管理器(除了上面提到的这些，还有很多其他的吗?)修改了他写的代码。

public class BrowsePicture extends Activity {

    //YOU CAN EDIT THIS TO WHATEVER YOU WANT
    private static final int SELECT_PICTURE = 1;

    private String selectedImagePath;
    //ADDED
    private String filemanagerstring;

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        ((Button) findViewById(R.id.Button01))
        .setOnClickListener(new OnClickListener() {

            public void onClick(View arg0) {

                // in onCreate or any event where your want the user to
                // select a file
                Intent intent = new Intent();
                intent.setType("image/*");
                intent.setAction(Intent.ACTION_GET_CONTENT);
                startActivityForResult(Intent.createChooser(intent,
                        "Select Picture"), SELECT_PICTURE);
            }
        });
    }

    //UPDATED
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (resultCode == RESULT_OK) {
            if (requestCode == SELECT_PICTURE) {
                Uri selectedImageUri = data.getData();

                //OI FILE Manager
                filemanagerstring = selectedImageUri.getPath();

                //MEDIA GALLERY
                selectedImagePath = getPath(selectedImageUri);

                //DEBUG PURPOSE - you can delete this if you want
                if(selectedImagePath!=null)
                    System.out.println(selectedImagePath);
                else System.out.println("selectedImagePath is null");
                if(filemanagerstring!=null)
                    System.out.println(filemanagerstring);
                else System.out.println("filemanagerstring is null");

                //NOW WE HAVE OUR WANTED STRING
                if(selectedImagePath!=null)
                    System.out.println("selectedImagePath is the right one for you!");
                else
                    System.out.println("filemanagerstring is the right one for you!");
            }
        }
    }

    //UPDATED!
    public String getPath(Uri uri) {
        String[] projection = { MediaStore.Images.Media.DATA };
        Cursor cursor = managedQuery(uri, projection, null, null, null);
        if(cursor!=null)
        {
            //HERE YOU WILL GET A NULLPOINTER IF CURSOR IS NULL
            //THIS CAN BE, IF YOU USED OI FILE MANAGER FOR PICKING THE MEDIA
            int column_index = cursor
            .getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
            cursor.moveToFirst();
            return cursor.getString(column_index);
        }
        else return null;
    }