java - 使用 glide 空指针异常从图库选择图像到 imageview-6ren

java - 使用 glide 空指针异常从图库选择图像到 imageview

转载作者：太空宇宙更新时间：2023-11-04 09:10:01

此代码通过确保应用程序不超过应用程序和移动设备的内存限制来解决 OOM 错误。可能导致错误 E/AndroidRuntime: FATAL EXCEPTION: main java.lang.NullPointerException at line 285 bitmap1.compress(Bitmap.CompressFormat.JPEG, 80, baos); 的原因在第 320 行 final String imageView1 = getStringImage1(bitmap1);在第 189 行 ImageUploadToServerFunction();

我哪里可能出错了？预先感谢您。

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();
        }

    }

}

最佳答案

你永远不会设置bitmap1类成员变量，定义为

Bitmap bitmap1;

您可能会对该变量和同名的各种方法参数感到困惑，但是这一行:

final String imageView1 = getStringImage1(bitmap1);

正在使用类成员变量，该变量从未设置，因此仍然为null。

您可能打算在 Glide onResourceReady 回调之一中设置它，例如:

MainActivity.this.bitmap1 = bitmap1

请注意，您需要对其他位图变量执行相同的操作。

关于java - 使用 glide 空指针异常从图库选择图像到 imageview，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/59759944/

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java - 使用 glide 空指针异常从图库选择图像到 imageview