我有一个代码可以将四个图像加载到imageview中。为了避免在加载大图像时出现OOM问题，我想在加载到imageview之前使用Glide / Picasso / Fresco调整大小。请注意，它适用于较小的图像，但适用于较大的图像（将由用户输入，因此我无法控制尺寸），当第二个较大的图像被选中在OOM上进行图像查看时，它立即崩溃。我了解这些谢谢您
package com.ny.a4imageswithtexts;
import android.app.ProgressDialog;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.drawable.Drawable;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.text.TextUtils;
import android.util.Base64;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import com.bumptech.glide.Glide;
import com.bumptech.glide.load.DecodeFormat;
import com.bumptech.glide.load.engine.Resource;
import com.bumptech.glide.request.RequestOptions;
import com.bumptech.glide.request.target.CustomTarget;
import com.bumptech.glide.request.transition.Transition;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.ByteArrayOutputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.nio.charset.StandardCharsets;
import java.util.HashMap;
import java.util.Map;
import javax.net.ssl.HttpsURLConnection;
public class MainActivity extends AppCompatActivity {
Bitmap bitmap1;
Bitmap bitmap2;
Bitmap bitmap3;
Bitmap bitmap4;
private int PICK_IMAGE_REQUEST1 = 1;
private int PICK_IMAGE_REQUEST2 = 2;
private int PICK_IMAGE_REQUEST3 = 1;
private int PICK_IMAGE_REQUEST4 = 2;
boolean check = true;
Button SelectImageGallery1;
Button SelectImageGallery2;
Button SelectImageGallery3;
Button SelectImageGallery4;
Button UploadImageServer;
ImageView imageView1;
ImageView imageView2;
ImageView imageView3;
ImageView imageView4;
EditText imageName1;
EditText imageName2;
EditText imageName3;
EditText imageName4;
ProgressDialog progressDialog ;
String GetImageNameEditText1;
String GetImageNameEditText2;
String GetImageNameEditText3;
String GetImageNameEditText4;
String ImageName1 = "image_name1";
String ImageName2 = "image_name2";
String ImageName3 = "image_name3";
String ImageName4 = "image_name4";
String ImagePath1 = "image_path1";
String ImagePath2 = "image_path2";
String ImagePath3 = "image_path3";
String ImagePath4 = "image_path4";
String ServerUploadPath ="http://11111111111111111.php";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
imageView1 = findViewById(R.id.imageView1);
imageView2 = findViewById(R.id.imageView2);
imageView3 = findViewById(R.id.imageView3);
imageView4 = findViewById(R.id.imageView4);
imageName1 = findViewById(R.id.editTextImageName1);
String strImageName1 = imageName1.getText().toString();
if(TextUtils.isEmpty(strImageName1))
{imageName1.setError("Image Name Must Be Entered");
}
imageName2 = findViewById(R.id.editTextImageName2);
String strImageName2 = imageName2.getText().toString();
if(TextUtils.isEmpty(strImageName2))
{imageName2.setError("Image Name Must Be Entered");
}
imageName3 = findViewById(R.id.editTextImageName3);
String strImageName3 = imageName3.getText().toString();
if(TextUtils.isEmpty(strImageName3))
{imageName3.setError("Image Name Must Be Entered");
}
imageName4 = findViewById(R.id.editTextImageName4);
String strImageName4 = imageName4.getText().toString();
if(TextUtils.isEmpty(strImageName4))
{imageName4.setError("Image Name Must Be Entered");
}
SelectImageGallery1 = findViewById(R.id.buttonSelect1);
SelectImageGallery2 = findViewById(R.id.buttonSelect2);
SelectImageGallery3 = findViewById(R.id.buttonSelect3);
SelectImageGallery4 = findViewById(R.id.buttonSelect4);
UploadImageServer = findViewById(R.id.buttonUpload);
SelectImageGallery1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(Intent.createChooser(intent,
"Select Image1 From Gallery"), 1);
}
});
SelectImageGallery2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(Intent.createChooser(intent, "Select Image4
From Gallery"), 2);
}
});
SelectImageGallery3.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(Intent.createChooser(intent,
"Select Image3 From Gallery"), 3);
}
});
SelectImageGallery4.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(Intent.createChooser(intent,
"Select Image4 From Gallery"), 4);
}
});
UploadImageServer.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
GetImageNameEditText1 = imageName1.getText().toString();
GetImageNameEditText2 = imageName2.getText().toString();
GetImageNameEditText3 = imageName3.getText().toString();
GetImageNameEditText4 = imageName4.getText().toString();
ImageUploadToServerFunction();
}
});
}
@Override
protected void onActivityResult(int RC, int RQC, Intent I) {
super.onActivityResult(RC, RQC, I);
if (RC == 1 && RQC == RESULT_OK && I != null && I.getData() != null) {
Uri uri = I.getData();
RequestOptions options = new RequestOptions()
.format(DecodeFormat.PREFER_RGB_565)
.placeholder(R.drawable.ic_launcher_background)
.error(R.drawable.ic_launcher_background);
Glide.with(this)
.setDefaultRequestOptions(options)
.load(uri)
.centerInside()
.into(new CustomTarget<Drawable>(512, 512) {
@Override
public void onResourceReady(@NonNull Drawable
bitmap1, @Nullable Transition<? super Drawable> transition) {
imageView1.setImageDrawable(bitmap1);
}
@Override
public void onLoadCleared(@Nullable Drawable
placeholder) {
}
});
}
if (RC == 2 && RQC == RESULT_OK && I != null && I.getData() != null) {
Uri uri = I.getData();
RequestOptions options = new RequestOptions()
.format(DecodeFormat.PREFER_RGB_565)
.placeholder(R.drawable.ic_launcher_background)
.error(R.drawable.ic_launcher_background);
Glide.with(this)
.setDefaultRequestOptions(options)
.load(uri)
.centerInside()
.into(new CustomTarget<Drawable>(512, 512) {
@Override
public void onResourceReady(@NonNull Drawable
bitmap2, @Nullable Transition<? super Drawable> transition) {
imageView2.setImageDrawable(bitmap2);
}
@Override
public void onLoadCleared(@Nullable Drawable
placeholder) {
}
});
}
if (RC == 3 && RQC == RESULT_OK && I != null && I.getData() != null) {
Uri uri = I.getData();
RequestOptions options = new RequestOptions()
.format(DecodeFormat.PREFER_RGB_565)
.placeholder(R.drawable.ic_launcher_background)
.error(R.drawable.ic_launcher_background);
Glide.with(this)
.setDefaultRequestOptions(options)
.load(uri)
.centerInside()
.into(new CustomTarget<Drawable>(512, 512) {
@Override
public void onResourceReady(@NonNull Drawable
bitmap3, @Nullable Transition<? super Drawable> transition) {
imageView3.setImageDrawable(bitmap3);
}
@Override
public void onLoadCleared(@Nullable Drawable
placeholder) {
}
});
}
if (RC == 4 && RQC == RESULT_OK && I != null && I.getData() != null) {
Uri uri = I.getData();
RequestOptions options = new RequestOptions()
.format(DecodeFormat.PREFER_RGB_565)
.placeholder(R.drawable.ic_launcher_background)
.error(R.drawable.ic_launcher_background);
Glide.with(this)
.setDefaultRequestOptions(options)
.load(uri)
.centerInside()
.into(new CustomTarget<Drawable>(512, 512) {
@Override
public void onResourceReady(@NonNull Drawable
bitmap4, @Nullable Transition<? super Drawable> transition) {
imageView4.setImageDrawable(bitmap4);
}
@Override
public void onLoadCleared(@Nullable Drawable
placeholder) {
}
});
}
}
public String getStringImage1(Bitmap bitmap1){
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bitmap1.compress(Bitmap.CompressFormat.JPEG, 80, baos);
byte[] imageBytes = baos.toByteArray();
String encodedImage1 = Base64.encodeToString(imageBytes,
Base64.DEFAULT);
return encodedImage1;
}
public String getStringImage2(Bitmap bitmap2){
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bitmap2.compress(Bitmap.CompressFormat.JPEG, 80, baos);
byte[] imageBytes = baos.toByteArray();
String encodedImage2 = Base64.encodeToString(imageBytes,
Base64.DEFAULT);
return encodedImage2;
}
public String getStringImage3(Bitmap bitmap3){
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bitmap3.compress(Bitmap.CompressFormat.JPEG, 80, baos);
byte[] imageBytes = baos.toByteArray();
String encodedImage3 = Base64.encodeToString(imageBytes,
Base64.DEFAULT);
return encodedImage3;
}
public String getStringImage4(Bitmap bitmap4){
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bitmap4.compress(Bitmap.CompressFormat.JPEG, 80, baos);
byte[] imageBytes = baos.toByteArray();
String encodedImage4 = Base64.encodeToString(imageBytes,
Base64.DEFAULT);
return encodedImage4;
}
public void ImageUploadToServerFunction(){
final String imageName1 = GetImageNameEditText1.trim();
final String imageName2 = GetImageNameEditText2.trim();
final String imageName3 = GetImageNameEditText3.trim();
final String imageName4 = GetImageNameEditText4.trim();
final String imageView1 = getStringImage1(bitmap1);
final String imageView2 = getStringImage2(bitmap2);
final String imageView3 = getStringImage3(bitmap3);
final String imageView4 = getStringImage4(bitmap4);
class AsyncTaskUploadClass extends AsyncTask<Void,Void,String> {
@Override
protected void onPreExecute() {
super.onPreExecute();
progressDialog =
ProgressDialog.show(MainActivity.this,"Image is Uploading","Please
Wait",false,false);
}
@Override
protected void onPostExecute(String string1) {
super.onPostExecute(string1);
// Dismiss the progress dialog after done uploading.
progressDialog.dismiss();
// Printing uploading success message coming from
server on android app.
Toast.makeText(MainActivity.this,string1,Toast.LENGTH_LONG).show();
// Setting image as transparent after done uploading.
ImageView cleared1 = findViewById(R.id.imageView1);
cleared1.setImageResource(android.R.color.transparent);
ImageView cleared2 = findViewById(R.id.imageView2);
cleared2.setImageResource(android.R.color.transparent);
ImageView cleared3 = findViewById(R.id.imageView3);
cleared3.setImageResource(android.R.color.transparent);
ImageView cleared4 = findViewById(R.id.imageView4);
cleared4.setImageResource(android.R.color.transparent);
}
@Override
protected String doInBackground(Void... params) {
ImageProcessClass imageProcessClass = new ImageProcessClass();
HashMap<String,String> HashMapParams = new
HashMap<String,String>();
HashMapParams.put(ImageName1, imageName1);
HashMapParams.put(ImageName2, imageName2);
HashMapParams.put(ImageName3, imageName3);
HashMapParams.put(ImageName4, imageName4);
HashMapParams.put(ImagePath1, imageView1);
HashMapParams.put(ImagePath2, imageView2);
HashMapParams.put(ImagePath3, imageView3);
HashMapParams.put(ImagePath4, imageView4);
String FinalData =
imageProcessClass.ImageHttpRequest(ServerUploadPath, HashMapParams);
return FinalData;
}
}
AsyncTaskUploadClass AsyncTaskUploadClassOBJ = new
AsyncTaskUploadClass();
AsyncTaskUploadClassOBJ.execute();
}
public class ImageProcessClass{
public String ImageHttpRequest(String
requestURL,HashMap<String, String> PData) {
StringBuilder stringBuilder = new StringBuilder();
try {
URL url;
HttpURLConnection httpURLConnectionObject ;
OutputStream OutPutStream;
BufferedWriter bufferedWriterObject ;
BufferedReader bufferedReaderObject ;
int RC ;
url = new URL(requestURL);
httpURLConnectionObject = (HttpURLConnection)
url.openConnection();
httpURLConnectionObject.setReadTimeout(19000);
httpURLConnectionObject.setConnectTimeout(19000);
httpURLConnectionObject.setRequestMethod("POST");
httpURLConnectionObject.setDoInput(true);
httpURLConnectionObject.setDoOutput(true);
OutPutStream = httpURLConnectionObject.getOutputStream();
bufferedWriterObject = new BufferedWriter(
new OutputStreamWriter(OutPutStream, "UTF8"));
bufferedWriterObject.write(bufferedWriterDataFN(PData));
bufferedWriterObject.flush();
bufferedWriterObject.close();
OutPutStream.close();
RC = httpURLConnectionObject.getResponseCode();
if (RC == HttpsURLConnection.HTTP_OK) {
bufferedReaderObject = new BufferedReader(new
InputStreamReader(httpURLConnectionObject.getInputStream()));
stringBuilder = new StringBuilder();
String RC2;
while ((RC2 = bufferedReaderObject.readLine()) != null){
stringBuilder.append(RC2);
}
}
} catch (Exception e) {
e.printStackTrace();
}
return stringBuilder.toString();
}
private String bufferedWriterDataFN(HashMap<String, String>
HashMapParams) throws UnsupportedEncodingException {
StringBuilder stringBuilderObject;
stringBuilderObject = new StringBuilder();
for (Map.Entry<String, String> KEY : HashMapParams.entrySet()) {
if (check)
check = false;
else
stringBuilderObject.append("&");
stringBuilderObject.append(URLEncoder.encode(KEY.getKey(), "UTF-8"));
stringBuilderObject.append("=");
stringBuilderObject.append(URLEncoder.encode(KEY.getValue(),
"UTF-8"));
}
return stringBuilderObject.toString();
}
}
}
'''
答案 0 :(得分：0)
即使存在Glide和Picasso，我的应用程序中也遇到了同样的问题。 我通过指定所需视图的高度和宽度来解决它。因此，应用程序不会超出应用程序和移动设备的内存限制。 这是我的应用程序中的一段代码。
val options = RequestOptions()
.format(DecodeFormat.PREFER_RGB_565)
.placeholder(R.drawable.ic_placeholder)
.error(R.drawable.ic_error)
Glide.with(this)
.setDefaultRequestOptions(options)
.load(campaign!!.imageURL)
.centerInside()
.into(object : CustomTarget<Drawable>(width, height) {
override fun onResourceReady(resource: Drawable, transition: Transition<in Drawable>?) {
imagePort.setImageDrawable(resource)
}
override fun onLoadCleared(placeholder: Drawable?) {
}
})
您的代码更改： 我执行了您的代码，这将是使用glide的工作副本。只是不要忘记在gradle文件中添加glide依赖项
implementation 'com.github.bumptech.glide:glide:4.11.0'
annotationProcessor 'com.github.bumptech.glide:compiler:4.11.0'
您的onActivityResult函数中的更改...
protected void onActivityResult(int RC, int RQC, Intent I) {
super.onActivityResult(RC, RQC, I);
if (RC == 1 && RQC == RESULT_OK && I != null && I.getData() != null) {
Uri uri = I.getData();
RequestOptions options = new RequestOptions()
.format(DecodeFormat.PREFER_RGB_565)
.placeholder(R.drawable.ic_launcher_background)
.error(R.drawable.ic_launcher_background);
Glide.with(this)
.setDefaultRequestOptions(options)
.load(uri)
.centerInside()
.into(new CustomTarget<Drawable>(1000, 500) {
@Override
public void onResourceReady(@NonNull Drawable resource, @Nullable Transition<? super Drawable> transition) {
imageView1.setImageDrawable(resource);
}
@Override
public void onLoadCleared(@Nullable Drawable placeholder) {
}
});
}
答案 1 :(得分：0)
1-实现Glide https://github.com/bumptech/glide（我更喜欢）
2-实现毕加索https://square.github.io/picasso/#download（也是一个强大的库）
他们专业处理图像。他们具有避免由图像引起的OOM的工具。您应该按照教程进行实施和使用。
但是OOM不仅是因为图像。必须遵守整个应用程序。
https://stackoverflow.com/a/58358334/11982611这篇文章可以为您提供帮助。
编辑：使用Glide调整大小
+---------+---------+---------+---------+
| COLUMN1 | COLUMN2 | COLUMN3 | COLUMN4 |
+---------+---------+---------+---------+
| A | B | C | null |
+---------+---------+---------+---------+
| A | B | C | D |
+---------+---------+---------+---------+
| X | Y | null | Z |
+---------+---------+---------+---------+
| X | Y | Q | Z |
+---------+---------+---------+---------+
答案 2 :(得分：0)
您应该创建具有所需大小的位图。通常，请保持在openGL限制以下（通常最大侧面为2048px）
然后，使用Matrix将原始位图转换为目标。
Matrix matrix=new Matrix();
matrix.postScale(0.001f,0.001f); // whatever scale you want to use
// recreate the new Bitmap
Bitmap resizedBitmap = Bitmap.createBitmap(bitmapSource, 0, newWidth, newHeight, matrix, true);
请注意，如果您的图片来自文件，则可以通过不同的机制来调整其大小，以免打开全尺寸图片（存在内存和性能问题），请参见BitmapFactory.Options