This question already has answers here:
How to resize image before loading to ImageView to avoid OOM issues
（4个答案）
5个月前关闭。
以下代码将4张图片从手机/标签库上传到服务器
并将路径写入数据库。经过测试，目前是
上载所有4张图片（如果文件大小不超过150kb）。问题来了
在我尝试上传1Mb图像时。该应用程序在加载时崩溃
iv的第二张图片。我已经阅读了这个Android位图，但是我不能
弄清楚如何在我的代码中实现它。请帮助。
（4个答案）
5个月前关闭。
以下代码将4张图片从手机/标签库上传到服务器
并将路径写入数据库。经过测试，目前是
上载所有4张图片（如果文件大小不超过150kb）。问题来了
在我尝试上传1Mb图像时。该应用程序在加载时崩溃
iv的第二张图片。我已经阅读了这个Android位图，但是我不能
弄清楚如何在我的代码中实现它。请帮助。
public class MainActivity extends AppCompatActivity {
Bitmap bitmap1;
Bitmap bitmap2;
Bitmap bitmap3;
Bitmap bitmap4;
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://ny.com/multiple4/uploadmultiple4.php";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
imageView1 = (ImageView) findViewById(R.id.imageView1);
imageView2 = (ImageView) findViewById(R.id.imageView2);
imageView3 = (ImageView) findViewById(R.id.imageView3);
imageView4 = (ImageView) findViewById(R.id.imageView4);
imageName1 = (EditText) findViewById(R.id.editTextImageName1);
String strImageName1 = imageName1.getText().toString();
if (TextUtils.isEmpty(strImageName1)) {
imageName1.setError("Image Name Must Be Entered");
}
imageName2 = (EditText) findViewById(R.id.editTextImageName2);
String strImageName2 = imageName2.getText().toString();
if (TextUtils.isEmpty(strImageName2)) {
imageName2.setError("Image Name Must Be Entered");
}
imageName3 = (EditText) findViewById(R.id.editTextImageName3);
String strImageName3 = imageName3.getText().toString();
if (TextUtils.isEmpty(strImageName3)) {
imageName3.setError("Image Name Must Be Entered");
}
imageName4 = (EditText) findViewById(R.id.editTextImageName4);
String strImageName4 = imageName4.getText().toString();
if (TextUtils.isEmpty(strImageName4)) {
imageName4.setError("Image Name Must Be Entered");
}
SelectImageGallery1 = (Button) findViewById(R.id.buttonSelect1);
SelectImageGallery2 = (Button) findViewById(R.id.buttonSelect2);
SelectImageGallery3 = (Button) findViewById(R.id.buttonSelect3);
SelectImageGallery4 = (Button) findViewById(R.id.buttonSelect4);
UploadImageServer = (Button) 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();
try {
bitmap1 = MediaStore.Images.Media.getBitmap(getContentResolver(), uri);
//bitmap1 = MediaStore.Images.Media.getBitmap(getContentResolver(), filePath);
imageView1.setImageBitmap(bitmap1);
} catch(IOException e) {
e.printStackTrace();
}
}
if (RC == 2 && RQC == RESULT_OK && I != null && I.getData() != null) {
Uri uri = I.getData();
try {
bitmap2 = MediaStore.Images.Media.getBitmap(getContentResolver(), uri);
//bitmap1 =
MediaStore.Images.Media.getBitmap(getContentResolver(), filePath);
imageView2.setImageBitmap(bitmap2);
} catch(IOException e) {
e.printStackTrace();
}
}
if (RC == 3 && RQC == RESULT_OK && I != null && I.getData() != null) {
Uri uri = I.getData();
byte[] imageAsBytes = null;
try {
bitmap3 = MediaStore.Images.Media.getBitmap(getContentResolver(), uri);
//bitmap1 =
MediaStore.Images.Media.getBitmap(getContentResolver(), filePath);
imageView3.setImageBitmap(bitmap3);
} catch(IOException e) {
e.printStackTrace();
}
}
if (RC == 4 && RQC == RESULT_OK && I != null && I.getData() != null) {
Uri uri = I.getData();
try {
bitmap4 = MediaStore.Images.Media.getBitmap(getContentResolver(), uri);
//bitmap1 =
MediaStore.Images.Media.getBitmap(getContentResolver(), filePath);
imageView4.setImageBitmap(bitmap4);
} catch(IOException e) {
e.printStackTrace();
}
}
}
public String getStringImage1(Bitmap bitmap1) {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bitmap1.compress(Bitmap.CompressFormat.JPEG, 60, 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, 60, 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, 60, 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, 60, 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 = (ImageView) findViewById(R.id.imageView1);
cleared1.setImageResource(android.R.color.transparent);
ImageView cleared2 = (ImageView) findViewById(R.id.imageView2);
cleared2.setImageResource(android.R.color.transparent);
ImageView cleared3 = (ImageView) findViewById(R.id.imageView3);
cleared3.setImageResource(android.R.color.transparent);
ImageView cleared4 = (ImageView) 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, "UTF-8"));
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
如果您尝试将Out Of Memory资源设置为bitmap的图像，则可能会出现ImageView，因为该资源本身可能并不大，如您所说的1MB，但是实际上它的大小会增大位图要大得多，因为当提取其数据以进行再现时，位图的工作方式。
我指的是Android Developers平台中的Loading Large Bitmaps Efficiently内容，以便为您更好地概述我的建议，但您可能还想更广泛地了解loading Bitmaps in Android。
我建议您尝试使用类BitmapFactory.Options，以最小化用作缓存以加载位图资源的虚拟内存。
最终，您将需要：
阅读位图尺寸和类型
加载按比例缩小的版本或在内存中满足ImageView期望的适当版本（大小）
10-05 21:39