如何区分图像是来自android中的画廊还是相机？

Question

我正在制作一个应用程序，我可以在其中从图库中选择图像，或者我可以从相机中获取图像，并且我正在使用所选图像移动到下一个活动。我想区分图像是来自图库还是来自相机.我不知道该怎么做。我正在提供我的代码。请帮助我如何做到这一点。

我的第一个活动是

import java.io.ByteArrayOutputStream;
import android.app.Activity;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.Color;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.Toast;



  public class LauncherActivity extends Activity 
   {
 private static final int CAMERA_REQUEST = 1888; 
 private static int RESULT_LOAD_IMAGE = 1;
 ImageButton camera;
 ImageButton gallery;
 ImageView gallery_image;

 protected void onCreate(Bundle paramBundle)
 {
 super.onCreate(paramBundle);
 setContentView(R.layout.launcher);
 gallery = (ImageButton)findViewById(R.id.select_photo);
 camera = (ImageButton)findViewById(R.id.take_photo);





   gallery.setOnClickListener(new OnClickListener() {

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub        
            Intent gallery_intent = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
            startActivityForResult(gallery_intent, RESULT_LOAD_IMAGE);
     }
    });

     camera.setOnClickListener(new OnClickListener() {

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub        
                    Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE); 
                    startActivityForResult(cameraIntent, CAMERA_REQUEST); 
    }
});

  }
   protected void onActivityResult(int requestCode, int resultCode, Intent data) {
  super.onActivityResult(requestCode, resultCode, data);



  if (requestCode == RESULT_LOAD_IMAGE && 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();
      Intent intent = new Intent(LauncherActivity.this, MainActivity.class);
      intent.putExtra("path", picturePath);
      startActivity(intent); 

    if (requestCode == CAMERA_REQUEST && resultCode == RESULT_OK && data!=null) {  

      Bitmap photo_from_camera = (Bitmap) data.getExtras().get("data"); 

      ByteArrayOutputStream stream = new ByteArrayOutputStream();
      photo_from_camera.compress(Bitmap.CompressFormat.PNG, 100, stream);
      byte[] byteArray = stream.toByteArray();
      Intent intent = new Intent(LauncherActivity.this, MainActivity.class);
      intent.putExtra("image", byteArray);
      startActivity(intent);


    }  
  }
  }

我的第二个活动是

   public class MainActivity extends Activity 
   {
   Bitmap scaled;
 protected void onCreate(Bundle paramBundle)
  {
  super.onCreate(paramBundle);
  setContentView(R.layout.activity_main);


   if(//condition to The image coming from gallery)
   {
   Bundle extras=getIntent().getExtras();
   String picturePath=extras.getString("path");
  scaled=BitmapFactory.decodeFile(picturePath);
  //the things i have to do with bitmap that i know
   }    
  if(//Condition to the image coming from camera)
  {
    Bundle extras = getIntent().getExtras();
   byte[] byteArray = extras.getByteArray("image");
   Bitmap bitmap = BitmapFactory.decodeByteArray(byteArray, 0, byteArray.length);
  scaled = Bitmap.createScaledBitmap(bitmap, width, height, true);
  //the things i have to do with bitmap that i know
  }
  }
   }

这里我没有在 if 语句中编写条件的代码。请帮助我。提前致谢。

Answer 1

startActivityForResult(cameraIntent, CAMERA_REQUEST); 
startActivityForResult(gallery_intent, RESULT_LOAD_IMAGE);

关于您的请求代码，您可以区分图像来自图库或相机

 boolean gallery;

     if(requestCode == CAMERA_REQUEST){
        //then image from camera

gallery=true;
    galleryIntent intent = new Intent(LauncherActivity.this, MainActivity.class);
          intent.putExtra("path", picturePath);  
         intent.putExtra("isfrom", gallery); 
    startActivity(intent);
        }
        if(requestCode == RESULT_LOAD_IMAGE){
    galleryIntent intent = new Intent(LauncherActivity.this, MainActivity.class);
          intent.putExtra("path", picturePath);  
         intent.putExtra("isfrom", gallery); 
    startActivity(intent);
        //then image from gallery
        }

在第二个活动中，您可以从意图中获取布尔值。如果它是来自图库的真实图像

Answer 2

// try this way,hope this will help you...

launcher.xml
<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">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1">
        <ImageView
            android:id="@+id/imageView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />
    </LinearLayout>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <Button
            android:id="@+id/select_photo"
            android:layout_width="0dp"
            android:layout_weight="1"
            android:layout_height="wrap_content"
            android:text="Gallery"/>

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

activity_main
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:gravity="center">

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:adjustViewBounds="true"/>
</LinearLayout>

LauncherActivity.java
public class LauncherActivity extends Activity {

    private static final int CAMERA_REQUEST = 1;
    private static final int RESULT_LOAD_IMAGE = 2;
    Button camera;
    Button gallery;
    ImageView imageView;
    private String imgPath;

    protected void onCreate(Bundle paramBundle) {
        super.onCreate(paramBundle);
        setContentView(R.layout.launcher);
        gallery = (Button) findViewById(R.id.select_photo);
        camera = (Button) findViewById(R.id.take_photo);
        imageView = (ImageView) findViewById(R.id.imageView);


        gallery.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                Intent intent = new Intent();
                intent.setType("image/*");
                intent.setAction(Intent.ACTION_GET_CONTENT);
                startActivityForResult(Intent.createChooser(intent, ""), RESULT_LOAD_IMAGE);
            }
        });

        camera.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                final Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                intent.putExtra(MediaStore.EXTRA_OUTPUT, setImageUri());
                startActivityForResult(intent, CAMERA_REQUEST);
            }
        });

    }

    public Uri setImageUri() {
        // Store image in dcim
        File file = new File(Environment.getExternalStorageDirectory() + "/DCIM/", "image" + new Date().getTime() + ".png");
        Uri imgUri = Uri.fromFile(file);
        this.imgPath = file.getAbsolutePath();
        return imgUri;
    }

    public String getImagePath() {
        return imgPath;
    }

    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (resultCode == Activity.RESULT_OK) {
            if (requestCode == RESULT_LOAD_IMAGE) {
                imageView.setImageBitmap(decodeFile(getAbsolutePath(data.getData())));
                Intent intent = new Intent(LauncherActivity.this, MainActivity.class);
                intent.putExtra("path", getAbsolutePath(data.getData()));
                intent.putExtra("from", "Gallery");
                startActivity(intent);
            } else if (requestCode == CAMERA_REQUEST) {
                imageView.setImageBitmap(decodeFile(getImagePath()));
                Intent intent = new Intent(LauncherActivity.this, MainActivity.class);
                intent.putExtra("path", getImagePath());
                intent.putExtra("from", "Camera");
                startActivity(intent);
            }
        }

    }

    public String getAbsolutePath(Uri uri) {
        if(Build.VERSION.SDK_INT >= 19){
            String id = uri.getLastPathSegment().split(":")[1];
            final String[] imageColumns = {MediaStore.Images.Media.DATA };
            final String imageOrderBy = null;
            Uri tempUri = getUri();
            Cursor imageCursor = getContentResolver().query(tempUri, imageColumns,
                    MediaStore.Images.Media._ID + "="+id, null, imageOrderBy);
            if (imageCursor.moveToFirst()) {
                return imageCursor.getString(imageCursor.getColumnIndex(MediaStore.Images.Media.DATA));
            }else{
                return null;
            }
        }else{
            String[] projection = { MediaStore.MediaColumns.DATA };
            Cursor cursor = getContentResolver().query(uri, projection, null, null, null);
            if (cursor != null) {
                int column_index = cursor.getColumnIndexOrThrow(MediaStore.MediaColumns.DATA);
                cursor.moveToFirst();
                return cursor.getString(column_index);
            } else
                return null;
        }

    }

    private Uri getUri() {
        String state = Environment.getExternalStorageState();
        if(!state.equalsIgnoreCase(Environment.MEDIA_MOUNTED))
            return MediaStore.Images.Media.INTERNAL_CONTENT_URI;

        return MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
    }

    public Bitmap decodeFile(String path) {
        try {
            // Decode image size
            BitmapFactory.Options o = new BitmapFactory.Options();
            o.inJustDecodeBounds = true;
            BitmapFactory.decodeFile(path, o);
            // The new size we want to scale to
            final int REQUIRED_SIZE = 1024;

            // Find the correct scale value. It should be the power of 2.
            int scale = 1;
            while (o.outWidth / scale / 2 >= REQUIRED_SIZE && o.outHeight / scale / 2 >= REQUIRED_SIZE)
                scale *= 2;

            // Decode with inSampleSize
            BitmapFactory.Options o2 = new BitmapFactory.Options();
            o2.inSampleSize = scale;
            return BitmapFactory.decodeFile(path, o2);
        } catch (Throwable e) {
            e.printStackTrace();
        }
        return null;
    }
}

MainActivity.java
public class MainActivity extends Activity {


    ImageView imageView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        imageView = (ImageView) findViewById(R.id.imageView);
        Toast.makeText(this,getIntent().getStringExtra("from"),Toast.LENGTH_SHORT)
        .show();
        imageView.setImageBitmap(decodeFile(getIntent().getStringExtra("path")));

    }

    public Bitmap decodeFile(String path) {
        try {
            // Decode image size
            BitmapFactory.Options o = new BitmapFactory.Options();
            o.inJustDecodeBounds = true;
            BitmapFactory.decodeFile(path, o);
            // The new size we want to scale to
            final int REQUIRED_SIZE = 1024;

            // Find the correct scale value. It should be the power of 2.
            int scale = 1;
            while (o.outWidth / scale / 2 >= REQUIRED_SIZE && o.outHeight / scale / 2 >= REQUIRED_SIZE)
                scale *= 2;

            // Decode with inSampleSize
            BitmapFactory.Options o2 = new BitmapFactory.Options();
            o2.inSampleSize = scale;
            return BitmapFactory.decodeFile(path, o2);
        } catch (Throwable e) {
            e.printStackTrace();
        }
        return null;

    }
}

Note : please not forget this permission in AndroidManifest.xml
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />