画像効果を生成する私の Android アプリでは、画像の選択に関して、次の 2 つのオプトインがあります。
1) ギャラリーから選ぶ
2) カメラから取る
以下は、前述のタスクを実行するコードです。
String imagePath = Environment.getExternalStorageDirectory().getAbsolutePath() + "/" + System.currentTimeMillis() + "_ePixels.jpg";
File imageFile = new File(imagePath);
imageUri = Uri.fromFile(imageFile);
public void onClick(View clickedView) {
int clickedViewId = clickedView.getId();
switch(clickedViewId) {
case R.id.takeFromCamera:
Intent imageCaptureIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
imageCaptureIntent.putExtra(android.provider.MediaStore.EXTRA_OUTPUT, imageUri);
startActivityForResult(imageCaptureIntent,1888);
break;
case R.id.chooseFromGallery:
Intent choosePictureIntent = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(choosePictureIntent, 1);
break;
default:
// As we have only two buttons, and nothing else can be clicked except the buttons. So no need to put
// code in the "DEFAULT CASE"
}
}
// Using one onActivityResult() for both calls and using a switch statement to differentiate what was called for actually!
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
super.onActivityResult(requestCode, resultCode, intent);
switch(requestCode) {
case 1888:
if(resultCode == RESULT_OK) {
// Success, when user actually took a photo and camera returned back it to us!
Intent cameraIntent = new Intent(MainOptionsActivity.this,ApplyEffectsActivity.class);
cameraIntent.putExtra("imageFileUri", imageUri);
startActivity(cameraIntent);
} else if(resultCode == RESULT_CANCELED){
// Failure, Activity couldn't receive the photo captured by the camera
Toast.makeText(MainOptionsActivity.this, "You didn't capture a photo!", Toast.LENGTH_LONG).show();
}
break;
case 1:
if(resultCode == RESULT_OK) {
// Success, Activity received the image from gallery
Uri imageUriForGallery = intent.getData();
Intent galleryIntent = new Intent(MainOptionsActivity.this,ApplyEffectsActivity.class);
galleryIntent.putExtra("imageFileUri", imageUriForGallery);
startActivity(galleryIntent);
} else if(resultCode == RESULT_CANCELED) {
// Failure, Gallery didn't send an image
Toast.makeText(MainOptionsActivity.this, "You didn't select an image", Toast.LENGTH_LONG).show();
}
break;
}
}
それはかなりうまくいきます。しかし、重い画像を読み込もうとしたり、カメラが高解像度の電話でアプリを実行しようとすると、明らかにメインスレッドでの重い作業が原因である ANR エラーが発生します。
明らかに、この問題の解決策は、すべての重い作業を別のスレッドで行うことです。しかし、それを行う方法は？私はそれに対する解決策を見つけることができません。別のスレッドでコードを実行する方法を尋ねているのではなく、別のアクティビティを呼び出してそのアクティビティから結果を得るため、別のスレッドでこのコードを実行する方法を尋ねているのです。
ApplyEffectsActivity のコードは次のとおりです。
package com.arslanali.epixels;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import android.app.Activity;
import android.content.Intent;
import android.content.pm.ActivityInfo;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.ProgressBar;
import android.widget.Toast;
import com.arslanali.epixels.imagelibrary.ImageEffectFactory;
public class ApplyEffectsActivity extends Activity implements OnClickListener{
ImageView sepiaGreenishImage;
ImageView embossImage;
ImageView sharpenImage;
ImageView slightYellowishImage;
ImageView slightBluishImage;
ImageView slightReddishImage;
ImageView slightGreenishImage;
ImageView negativeImage;
ImageView greyScaleImage;
ImageView tintSeventyImage;
ImageView tintThirtyImage;
ImageView snowImage;
ImageView darkImage;
ImageView noiseImage;
ImageView flipImage;
ImageView rotateImage;
ImageView gaussianBlurImage;
ImageView reddishImage;
ImageView bluishImage;
ImageView greenishImage;
ImageView blackFilterImage;
ImageView increasedSepiaImage;
ImageView spiaBluishImage;
ImageView brightImage;
ImageView mirrorImage;
Button nextButton;
Button saveCurrentEditedImageButton;
// For displaying the image after modification
ImageView affectedImageView;
ProgressBar waitingProgressBar;
Bitmap sourceBitmap;
Bitmap modifiedBitmap;
// For sending it to next activity for the sharing purposes
Uri modifiedImgaeUri;
// Since, In beginning, we are dealing with the raw image
Boolean isEdited = false;
EffectNames currentEffectName;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_apply_effects);
// Restricting the user to use mobile phone only in portrait mode
setRequestedOrientation (ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
// Grabbing the references of all the images
sepiaGreenishImage = (ImageView) findViewById(R.id.sepiaGreenish);
embossImage = (ImageView) findViewById(R.id.emboss);
sharpenImage = (ImageView) findViewById(R.id.sharpen);
slightYellowishImage = (ImageView) findViewById(R.id.ligth_yellow);
slightBluishImage = (ImageView) findViewById(R.id.light_blue);
slightReddishImage = (ImageView) findViewById(R.id.light_red);
slightGreenishImage = (ImageView) findViewById(R.id.light_green);
negativeImage = (ImageView) findViewById(R.id.negative);
greyScaleImage = (ImageView) findViewById(R.id.greyscale);
tintSeventyImage = (ImageView) findViewById(R.id.tint_at_70);
tintThirtyImage = (ImageView) findViewById(R.id.tint_at_30);
snowImage = (ImageView) findViewById(R.id.snow);
darkImage = (ImageView) findViewById(R.id.darken);
noiseImage = (ImageView) findViewById(R.id.noise);
flipImage = (ImageView) findViewById(R.id.flip);
rotateImage = (ImageView) findViewById(R.id.rotate);
gaussianBlurImage = (ImageView) findViewById(R.id.blur);
reddishImage = (ImageView) findViewById(R.id.reddish);
bluishImage = (ImageView) findViewById(R.id.bluish);
greenishImage = (ImageView) findViewById(R.id.greenish);
blackFilterImage = (ImageView) findViewById(R.id.black_filter);
increasedSepiaImage = (ImageView) findViewById(R.id.increased_sepia);
spiaBluishImage = (ImageView) findViewById(R.id.sepia_bluish);
brightImage = (ImageView) findViewById(R.id.brighten);
mirrorImage = (ImageView) findViewById(R.id.mirror);
nextButton = (Button) findViewById(R.id.share);
saveCurrentEditedImageButton = (Button) findViewById(R.id.saveit);
affectedImageView = (ImageView) findViewById(R.id.affectedImage);
waitingProgressBar = (ProgressBar) findViewById(R.id.progressBar1);
// Since, at the start we are displaying the image. So ProgressBar should be invisible
waitingProgressBar.setVisibility(ProgressBar.INVISIBLE);
nextButton.setOnClickListener(this);
saveCurrentEditedImageButton.setOnClickListener(this);
sepiaGreenishImage.setOnClickListener(this);
embossImage.setOnClickListener(this);
sharpenImage.setOnClickListener(this);
slightYellowishImage.setOnClickListener(this);
slightBluishImage.setOnClickListener(this);
slightReddishImage.setOnClickListener(this);
slightGreenishImage.setOnClickListener(this);
negativeImage.setOnClickListener(this);
greyScaleImage.setOnClickListener(this);
tintSeventyImage.setOnClickListener(this);
tintThirtyImage.setOnClickListener(this);
snowImage.setOnClickListener(this);
darkImage.setOnClickListener(this);
noiseImage.setOnClickListener(this);
flipImage.setOnClickListener(this);
rotateImage.setOnClickListener(this);
gaussianBlurImage.setOnClickListener(this);
reddishImage.setOnClickListener(this);
bluishImage.setOnClickListener(this);
greenishImage.setOnClickListener(this);
blackFilterImage.setOnClickListener(this);
increasedSepiaImage.setOnClickListener(this);
spiaBluishImage.setOnClickListener(this);
brightImage.setOnClickListener(this);
mirrorImage.setOnClickListener(this);
// Grabbing the Uri from the previous calling activity
Uri imageUri = (Uri) getIntent().getExtras().getParcelable("imageFileUri");
try {
sourceBitmap = BitmapFactory.decodeStream(getContentResolver().openInputStream(imageUri));
affectedImageView.setImageBitmap(sourceBitmap);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
// Using a switch statement for all cases and storing the result in "currentEffectName"
@Override
public void onClick(View clickedView) {
int clickedViewId = clickedView.getId();
switch(clickedViewId) {
case R.id.sepiaGreenish:
currentEffectName = EffectNames.SEPIA_GREEN_EFFECT;
ImageAffector sepia = new ImageAffector();
sepia.execute(sourceBitmap);
break;
case R.id.emboss:
currentEffectName = EffectNames.EMBOSSING_EFFECT;
ImageAffector emboss = new ImageAffector();
emboss.execute(sourceBitmap);
break;
case R.id.sharpen:
currentEffectName = EffectNames.SHARPEN_EFFECT;
ImageAffector sharpen = new ImageAffector();
sharpen.execute(sourceBitmap);
break;
case R.id.ligth_yellow:
currentEffectName = EffectNames.LIGHT_YELLOW_EFFECT;
ImageAffector lightYellow = new ImageAffector();
lightYellow.execute(sourceBitmap);
break;
case R.id.light_blue:
currentEffectName = EffectNames.SLIGHT_BLUISH_EFFECT;
ImageAffector lightBlue = new ImageAffector();
lightBlue.execute(sourceBitmap);
break;
case R.id.light_red:
currentEffectName = EffectNames.SLIGHT_REDDISH_EFFECT;
ImageAffector lightRed = new ImageAffector();
lightRed.execute(sourceBitmap);
break;
case R.id.light_green:
currentEffectName = EffectNames.SLIGHT_GREENISH_EFFECT;
ImageAffector lightGreen = new ImageAffector();
lightGreen.execute(sourceBitmap);
break;
case R.id.negative:
currentEffectName = EffectNames.INVERT_EFFECT;
ImageAffector negative = new ImageAffector();
negative.execute(sourceBitmap);
break;
case R.id.greyscale:
currentEffectName = EffectNames.GRAY_SCALE_EFFECT;
ImageAffector greyScale = new ImageAffector();
greyScale.execute(sourceBitmap);
break;
case R.id.tint_at_30:
currentEffectName = EffectNames.TINT_AT_30;
ImageAffector tintAt30 = new ImageAffector();
tintAt30.execute(sourceBitmap);
break;
case R.id.tint_at_70:
currentEffectName = EffectNames.TINT_AT_70;
ImageAffector tintAt70 = new ImageAffector();
tintAt70.execute(sourceBitmap);
break;
case R.id.snow:
currentEffectName = EffectNames.SNOW_EFFECT;
ImageAffector snowEffect = new ImageAffector();
snowEffect.execute(sourceBitmap);
break;
case R.id.darken:
currentEffectName = EffectNames.DARKEN_EFFECT;
ImageAffector darken = new ImageAffector();
darken.execute(sourceBitmap);
break;
case R.id.noise:
currentEffectName = EffectNames.NOSIY_EFFECT;
ImageAffector noise = new ImageAffector();
noise.execute(sourceBitmap);
break;
case R.id.flip:
currentEffectName = EffectNames.FLIPPING_EFFECT;
ImageAffector flip = new ImageAffector();
flip.execute(sourceBitmap);
break;
case R.id.rotate:
currentEffectName = EffectNames.ROTATE_EFFECT;
ImageAffector rotate = new ImageAffector();
rotate.execute(sourceBitmap);
break;
case R.id.blur:
currentEffectName = EffectNames.BLUR_EFFECT;
ImageAffector blur = new ImageAffector();
blur.execute(sourceBitmap);
break;
case R.id.reddish:
currentEffectName = EffectNames.REDDISH_EFFECT;
ImageAffector reddish = new ImageAffector();
reddish.execute(sourceBitmap);
break;
case R.id.bluish:
currentEffectName = EffectNames.BLUISH_EFFECT;
ImageAffector bluish = new ImageAffector();
bluish.execute(sourceBitmap);
break;
case R.id.greenish:
currentEffectName = EffectNames.GREENISH_EFFECT;
ImageAffector greenish = new ImageAffector();
greenish.execute(sourceBitmap);
break;
case R.id.black_filter:
currentEffectName = EffectNames.BLACK_FILTER_EFFECT;
ImageAffector blackFilter = new ImageAffector();
blackFilter.execute(sourceBitmap);
break;
case R.id.increased_sepia:
currentEffectName = EffectNames.INCREASED_SEPIA_EFFECT;
ImageAffector increasedSepia = new ImageAffector();
increasedSepia.execute(sourceBitmap);
break;
case R.id.sepia_bluish:
currentEffectName = EffectNames.SEPIA_BLUE_EFFECT;
ImageAffector sepiaBluish = new ImageAffector();
sepiaBluish.execute(sourceBitmap);
break;
case R.id.brighten:
currentEffectName = EffectNames.BRIGHTENING_EFFECT;
ImageAffector brighten = new ImageAffector();
brighten.execute(sourceBitmap);
break;
case R.id.mirror:
currentEffectName = EffectNames.MIRROR_EFFECT;
ImageAffector mirror = new ImageAffector();
mirror.execute(sourceBitmap);
break;
case R.id.saveit:
modifiedImgaeUri = saveEditedImageIntoSDCard(modifiedBitmap);
Toast.makeText(this, "Saved!" , Toast.LENGTH_SHORT).show();
isEdited = true;
break;
case R.id.share:
// Making sure that user has applied at least one effect. Otherwise it will be useless
// to share the unmodified image with the use of app.
if(!isEdited) {
// If not modified, enforce the user to first modify and then share!
Toast.makeText(this, "You didn't apply any effect", Toast.LENGTH_LONG).show();
break;
}
Intent shareActivityIntent = new Intent(ApplyEffectsActivity.this, ShareActivity.class);
shareActivityIntent.putExtra("modifiedImageUri", modifiedImgaeUri);
startActivity(shareActivityIntent);
break;
}
}
public static Uri saveEditedImageIntoSDCard(Bitmap bitmap) {
// Using PNG format over JPEG for better performance of the app
String imageFilePath = Environment.getExternalStorageDirectory().getAbsolutePath() + "/ePixels_" + System.currentTimeMillis() + ".png";
File imageFile = new File(imageFilePath);
Uri modifiedImageUri = Uri.fromFile(imageFile);
FileOutputStream outStream;
try {
outStream = new FileOutputStream(imageFile);
bitmap.compress(Bitmap.CompressFormat.PNG, 100, outStream);
// Writing the image to outStream
outStream.flush();
// Making sure nothing else could be written to file from any other source
outStream.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return modifiedImageUri;
}
private class ImageAffector extends AsyncTask<Bitmap, Integer, Bitmap>{
protected void onPreExecute(){
// Since, image has gone into background for modification. Therefore hiding it and making
// ProgressBar visible
waitingProgressBar.setVisibility(ProgressBar.VISIBLE);
affectedImageView.setVisibility(ImageView.INVISIBLE);
}
protected Bitmap doInBackground(Bitmap... bitmap) {
try{
switch(currentEffectName) {
case SEPIA_GREEN_EFFECT:
modifiedBitmap = ImageEffectFactory.applySepiaEffectWithGreenAsMajority(bitmap[0]);
return modifiedBitmap;
case EMBOSSING_EFFECT:
modifiedBitmap = ImageEffectFactory.embossAnImage(bitmap[0]);
return modifiedBitmap;
case SHARPEN_EFFECT:
modifiedBitmap = ImageEffectFactory.sharpenAnImage(bitmap[0]);
return modifiedBitmap;
case MIRROR_EFFECT:
modifiedBitmap = ImageEffectFactory.mirrorAnImage(bitmap[0]);
return modifiedBitmap;
case LIGHT_YELLOW_EFFECT:
modifiedBitmap = ImageEffectFactory.produceSlightYellowishEffect(bitmap[0]);
return modifiedBitmap;
case SLIGHT_REDDISH_EFFECT:
modifiedBitmap = ImageEffectFactory.produceSlightReddishEffect(bitmap[0]);
return modifiedBitmap;
case SLIGHT_GREENISH_EFFECT:
modifiedBitmap = ImageEffectFactory.produceSlightGreenishEffect(bitmap[0]);
return modifiedBitmap;
case SLIGHT_BLUISH_EFFECT:
modifiedBitmap = ImageEffectFactory.produceSlightBluishEffect(bitmap[0]);
return modifiedBitmap;
case INVERT_EFFECT:
modifiedBitmap = ImageEffectFactory.invertAllPixels(bitmap[0]);
return modifiedBitmap;
case GRAY_SCALE_EFFECT:
modifiedBitmap = ImageEffectFactory.turnIntoGrayScale(bitmap[0]);
return modifiedBitmap;
case TINT_AT_30:
modifiedBitmap = ImageEffectFactory.tintImage(bitmap[0], 30);
return modifiedBitmap;
case TINT_AT_70:
modifiedBitmap = ImageEffectFactory.tintImage(bitmap[0], 70);
return modifiedBitmap;
case SNOW_EFFECT:
modifiedBitmap = ImageEffectFactory.applySnowEffect(bitmap[0]);
return modifiedBitmap;
case DARKEN_EFFECT:
modifiedBitmap = ImageEffectFactory.darkenAnImage(bitmap[0]);
return modifiedBitmap;
case NOSIY_EFFECT:
modifiedBitmap = ImageEffectFactory.applyNoiseEffect(bitmap[0]);
return modifiedBitmap;
case FLIPPING_EFFECT:
modifiedBitmap = ImageEffectFactory.flipAnImage(bitmap[0]);
return modifiedBitmap;
case ROTATE_EFFECT:
modifiedBitmap = ImageEffectFactory.rotateAnImage(bitmap[0]);
return modifiedBitmap;
case BLUR_EFFECT:
modifiedBitmap = ImageEffectFactory.applyGaussainBlur(bitmap[0]);
return modifiedBitmap;
case REDDISH_EFFECT:
modifiedBitmap = ImageEffectFactory.produceReddieshEffect(bitmap[0]);
return modifiedBitmap;
case BLUISH_EFFECT:
modifiedBitmap = ImageEffectFactory.produceBluishEffect(bitmap[0]);
return modifiedBitmap;
case GREENISH_EFFECT:
modifiedBitmap = ImageEffectFactory.produceGreenishEffect(bitmap[0]);
return modifiedBitmap;
case BLACK_FILTER_EFFECT:
modifiedBitmap = ImageEffectFactory.applyBlackFilter(bitmap[0]);
return modifiedBitmap;
case INCREASED_SEPIA_EFFECT:
modifiedBitmap = ImageEffectFactory.applyIncreasedSepiaEffect(bitmap[0]);
return modifiedBitmap;
case SEPIA_BLUE_EFFECT:
modifiedBitmap = ImageEffectFactory.applySepiaEffectWithBlueAsMajority(bitmap[0]);
return modifiedBitmap;
case BRIGHTENING_EFFECT:
modifiedBitmap = ImageEffectFactory.brigthenAnImage(bitmap[0]);
return modifiedBitmap;
}
}catch(Exception e){
// For the reason: if the size of image is too large to load
Toast.makeText(ApplyEffectsActivity.this, e.getMessage(), Toast.LENGTH_LONG).show();
Log.e("Image","Failed to load image",e);
}
return null;
}
protected void onPostExecute(Bitmap img){
// After the modification of image, displaying it and hiding ProgressBar.
waitingProgressBar.setVisibility(ProgressBar.INVISIBLE);
affectedImageView.setVisibility(ImageView.VISIBLE);
affectedImageView.setImageBitmap(img);
// Setting it modifiedBitmap so that we could share it on next activity
modifiedBitmap = img;
}
protected void onProgressUpdate(Integer... params){
super.onProgressUpdate(params);
}
protected void onCancelled(){
}
}
}