Java Android:在不同的Android版本中上载图像时出错
我在不同的android版本中上传图像时遇到问题。我需要为php服务器发送图像，所以我使用的是Web服务。我用Froyo e果冻豆做了测试，它们有效，但KitKat不起作用。我读到了关于MediaStore的文章，我看到了不同的方式，我不知道我的想法是对还是错 我对我的项目进行了调试，我可以看到，在KitKat中路径为NULL，Logcat告诉我KitKat中的“Java NULL指针”。我如何做一个适用于所有版本的应用程序 UploadImage.javaJava Android:在不同的Android版本中上载图像时出错,java,android,web-services,Java,Android,Web Services,我在不同的android版本中上传图像时遇到问题。我需要为php服务器发送图像，所以我使用的是Web服务。我用Froyo e果冻豆做了测试，它们有效，但KitKat不起作用。我读到了关于MediaStore的文章，我看到了不同的方式，我不知道我的想法是对还是错 我对我的项目进行了调试，我可以看到，在KitKat中路径为NULL，Logcat告诉我KitKat中的“Java NULL指针”。我如何做一个适用于所有版本的应用程序 UploadImage.java package br.gov.rj.
package br.gov.rj.barraemexposicao;
import android.app.ProgressDialog;
import android.content.ActivityNotFoundException;
import android.content.Intent;
import android.database.Cursor;
import android.net.Uri;
import android.provider.MediaStore;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
public class EnviaFoto extends ActionBarActivity {
final int PICK_FILE_RESULT_CODE = 1;
final int CAMERA_IMAGE =2;
TextView messageText;
Button uploadButton;
Button btnTiraFoto;
Button selectImage;
ImageView imgFoto;
int serverResponseCode = 0;
ProgressDialog dialog = null;
String upLoadServerUri = "http://www.kweekdesign.com.br/test/recebe/UploadToServer.php";
String filePath = "";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_envia_foto);
selectImage = (Button) findViewById(R.id.selectImage);
imgFoto = (ImageView) findViewById(R.id.imgFoto);
messageText = (TextView)findViewById(R.id.messageText);
uploadButton = (Button)findViewById(R.id.uploadButton);
btnTiraFoto = (Button) findViewById(R.id.btnTiraFoto);
upLoadServerUri = "http://www.kweekdesign.com.br/test/recebe/UploadToServer.php";
addListeners();
}
public String uriToPath(Uri uri) {
String[] projection = { MediaStore.Images.Media.DATA };
Cursor cursor = managedQuery(uri, projection, null, null, null);
int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
return cursor.getString(column_index);
}
@Override
protected void onActivityResult (int requestCode, int resultCode, Intent data){
if (data != null && (requestCode == PICK_FILE_RESULT_CODE || requestCode == CAMERA_IMAGE)){
filePath = uriToPath(data.getData());
imgFoto.setImageURI(data.getData());
uploadButton.setVisibility(1);
}
}
public int uploadFile(String sourceFileUri) {
String fileName = sourceFileUri;
HttpURLConnection conn = null;
DataOutputStream dos = null;
String lineEnd = "\r\n";
String twoHyphens = "--";
String boundary = "*****";
int bytesRead, bytesAvailable, bufferSize;
byte[] buffer;
int maxBufferSize = 1 * 1024 * 1024;
File sourceFile = new File(sourceFileUri);
if (!sourceFile.isFile()) {
dialog.dismiss();
Log.e("uploadFile", "Source File not exist :" + filePath);
runOnUiThread(new Runnable() {
public void run() {
messageText.setText("Source File not exist :"+filePath);
}
});
return 0;
}
else
{
try {
// open a URL connection to the Servlet
FileInputStream fileInputStream = new FileInputStream(sourceFile);
URL url = new URL(upLoadServerUri);
// Open a HTTP connection to the URL
conn = (HttpURLConnection) url.openConnection();
conn.setDoInput(true); // Allow Inputs
conn.setDoOutput(true); // Allow Outputs
conn.setUseCaches(false); // Don't use a Cached Copy
conn.setRequestMethod("POST");
conn.setRequestProperty("Connection", "Keep-Alive");
conn.setRequestProperty("ENCTYPE", "multipart/form-data");
conn.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary);
conn.setRequestProperty("uploaded_file", fileName);
dos = new DataOutputStream(conn.getOutputStream());
dos.writeBytes(twoHyphens + boundary + lineEnd);
dos.writeBytes("Content-Disposition: form-data; name=\"uploaded_file\";filename=\""
+ fileName + "\"" + lineEnd);
dos.writeBytes(lineEnd);
// create a buffer of maximum size
bytesAvailable = fileInputStream.available();
bufferSize = Math.min(bytesAvailable, maxBufferSize);
buffer = new byte[bufferSize];
// read file and write it into form...
bytesRead = fileInputStream.read(buffer, 0, bufferSize);
while (bytesRead > 0) {
dos.write(buffer, 0, bufferSize);
bytesAvailable = fileInputStream.available();
bufferSize = Math.min(bytesAvailable, maxBufferSize);
bytesRead = fileInputStream.read(buffer, 0, bufferSize);
}
// send multipart form data necesssary after file data...
dos.writeBytes(lineEnd);
dos.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);
// Responses from the server (code and message)
serverResponseCode = conn.getResponseCode();
String serverResponseMessage = conn.getResponseMessage();
Log.i("uploadFile", "HTTP Response is : "
+ serverResponseMessage + ": " + serverResponseCode);
if(serverResponseCode == 200){
runOnUiThread(new Runnable() {
public void run() {
String msg = "Envio feito com sucesso!";
messageText.setText(msg);
Toast.makeText(EnviaFoto.this, "File Upload Complete.",
Toast.LENGTH_SHORT).show();
}
});
}
//close the streams //
fileInputStream.close();
dos.flush();
dos.close();
} catch (MalformedURLException ex) {
dialog.dismiss();
ex.printStackTrace();
runOnUiThread(new Runnable() {
public void run() {
messageText.setText("MalformedURLException Exception : check script url.");
Toast.makeText(EnviaFoto.this, "MalformedURLException",
Toast.LENGTH_SHORT).show();
}
});
Log.e("Upload file to server", "error: " + ex.getMessage(), ex);
} catch (Exception e) {
dialog.dismiss();
e.printStackTrace();
runOnUiThread(new Runnable() {
public void run() {
messageText.setText("Got Exception : see logcat ");
Toast.makeText(EnviaFoto.this, "Got Exception : see logcat ",
Toast.LENGTH_SHORT).show();
}
});
Log.e("Upload file to server Exception", "Exception : "
+ e.getMessage(), e);
}
dialog.dismiss();
return serverResponseCode;
} // End else block
}
private void addListeners(){
selectImage.setOnClickListener(new View.OnClickListener(){
public void onClick(View view){
Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
Intent chooser = Intent.createChooser(intent,"Escolha a foto");
intent.setType("image/*");
try {
startActivityForResult(chooser, PICK_FILE_RESULT_CODE );
}catch (ActivityNotFoundException e){
Log.e("tag", e.getMessage());
}
}
});
uploadButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
dialog = ProgressDialog.show(EnviaFoto.this, "", "Enviando foto...", true);
new Thread(new Runnable() {
public String uriToPath(Uri uri) {
String[] projection = { MediaStore.Images.Media.DATA };
Cursor cursor = managedQuery(uri, projection, null, null, null);
int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
return cursor.getString(column_index);
}
protected void onActivityResult (int requestCode, int resultCode, Intent data){
if (data != null && requestCode == PICK_FILE_RESULT_CODE){
filePath = uriToPath(data.getData());
imgFoto.setImageURI(data.getData());
uploadButton.setVisibility(1);
}
} public void run() {
runOnUiThread(new Runnable() {
public void run() {
messageText.setText("Enviando foto...");
}
});
uploadFile(filePath);
}
}).start();
}
});
btnTiraFoto.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
startActivityForResult(new Intent(MediaStore.ACTION_IMAGE_CAPTURE), CAMERA_IMAGE);
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.envia_foto, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="br.gov.rj.barraemexposicao" >
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="19" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="br.gov.rj.barraemexposicao.EnviaFoto"
android:label="@string/app_name"
android:screenOrientation="portrait" >
<intent-filter>
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="br.gov.rj.barraemexposicao.Enquete"
android:label="@string/title_activity_enquete" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
好的，关于这个例外
java.lang.NullPointerException: Attempt to invoke virtual method 'char[] java.lang.String.toCharArray()' on a null object reference
uriToPath（Uri-Uri）data获取的Uri
。getData（）uriToPath（Uri-Uri）Uri文件路径中获取null
的可能性较小，但如果您使用的是Photos应用程序，则机会会增加
这是因为你的照片应用程序显示的照片可能不在你的本地设备上，这些照片实际上在谷歌服务器上。因此，当您通过选择照片请求Uri
时，它会给出链接到该服务器的Uri
Uri可能是这样的content://com.google.android.apps.photos.content/0/https%3A%2F%2Flh3.googleusercontent.com%2FL-3Jm0TaSqnuKkitli5mK0-d
&这不是你的本地设备。
本地设备的Uri
如下
content://media/external/images/media/49518
由于这种差异，您的uriToPath（uriuri）
将返回null
因此，首先检查Uri
&相应地从本地设备或服务器获取图像
您可以使用，这样就不必担心本地和服务器的文件
private Bitmap getBitmapFromUri(Uri uri) throws IOException {
ParcelFileDescriptor parcelFileDescriptor =
getContentResolver().openFileDescriptor(uri, "r");
FileDescriptor fileDescriptor = parcelFileDescriptor.getFileDescriptor();
Bitmap image = BitmapFactory.decodeFileDescriptor(fileDescriptor);
parcelFileDescriptor.close();
return image;
}
但如果你在photos应用程序中有一些本地照片，那么在选择这些照片时，你将获得本地Uri，这将为你提供正确的文件路径
您还可以在photos应用程序中下载照片（位于Google服务器上），然后使用它。在onActivityResult中使用以下方法，结果它可以在每台设备上工作
Uri selectedImageUri =null;
try {
Path = data.getExtras().getString("dataImg");
} catch (Exception e) {
}
try {
if (Path == null) {
Path = data.getData().toString();
}
} catch (Exception e) {
e.printStackTrace();
}
try {
if (Path == null) {
Path = data.getExtras().getString("data");
}
} catch (Exception e) {
e.printStackTrace();
}
try {
if (Path == null) {
Uri newPhotoUri = null;
newPhotoUri = data.getData();
String[] projection = { MediaStore.Images.Media.DATA };
CursorLoader loader = new CursorLoader(this,
newPhotoUri, projection, null, null,
null);
Cursor cursor = loader.loadInBackground();
int column_index_data = cursor
.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
Path = cursor.getString(column_index_data);
}
} catch (Exception e) {
e.printStackTrace();
}
try {
if (Path == null) {
selectedImageUri = data.getData();
if (selectedImageUri == null) {
Bitmap photo = (Bitmap) data.getExtras()
.get("data");
selectedImageUri = getImageUri(
Survey_Elabel.this, photo);
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
用于获取URI的方法
public Uri getImageUri(Context inContext, Bitmap inImage) {
ByteArrayOutputStream bytes = new ByteArrayOutputStream();
inImage.compress(Bitmap.CompressFormat.JPEG, 100, bytes);
String path = Images.Media.insertImage(inContext.getContentResolver(), inImage, "Title", null);
return Uri.parse(path);
}
您可以尝试此代码，对于api>19，检索图像会有所不同
txtlogochange.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 Picture"), 1);
}
});
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode == this.RESULT_OK) {
if (requestCode == 1) {
if (Build.VERSION.SDK_INT < 19) {
Uri selectedImage = data.getData();
// System.out.println("selectedImage "+selectedImage);
String[] filePathColumn = {MediaStore.Images.Media.DATA};
Cursor cursor = getContentResolver().query(selectedImage, filePathColumn, null, null, null);
cursor.moveToFirst();
int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
smallImagePath = cursor.getString(columnIndex);
cursor.close();
System.out.println("smallImagePath" + smallImagePath);
logoImg.setImageBitmap(BitmapFactory.decodeFile(smallImagePath));
encodeImage();
}
else {
try {
InputStream imInputStream = getContentResolver().openInputStream(data.getData());
Bitmap bitmap = BitmapFactory.decodeStream(imInputStream);
smallImagePath = saveGalaryImageOnLitkat(bitmap);
logoImg.setImageBitmap(BitmapFactory.decodeFile(smallImagePath));
encodeImage();
} catch (FileNotFoundException e) {
e.printStackTrace();
}
// finishAndSetResult(RESULT_OK, picturePath, false);
}
}
}
}
private File temp_path;
private final int COMPRESS = 100;
private String saveGalaryImageOnLitkat(Bitmap bitmap) {
try {
File cacheDir;
if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED))
cacheDir = new File(Environment.getExternalStorageDirectory(), getResources().getString(R.string.app_name));
else
cacheDir = getExternalFilesDir(Environment.DIRECTORY_PICTURES);
if (!cacheDir.exists())
cacheDir.mkdirs();
String filename = System.currentTimeMillis() + ".jpg";
File file = new File(cacheDir, filename);
temp_path = file.getAbsoluteFile();
// if(!file.exists())
file.createNewFile();
FileOutputStream out = new FileOutputStream(file);
bitmap.compress(Bitmap.CompressFormat.JPEG, COMPRESS, out);
return file.getAbsolutePath();
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
txtlogochange.setOnClickListener（新视图.OnClickListener（））{
@凌驾
公共void onClick（视图）{
意图=新意图（）；
intent.setType（“image/*”）；
intent.setAction（intent.ACTION\u GET\u CONTENT）；
startActivityForResult（Intent.createChooser（Intent，“选择图片”），1）；
}
});
@凌驾
ActivityResult上的公共void（int请求代码、int结果代码、意图数据）{
if（resultCode==this.RESULT\u确定）{
if（requestCode==1）{
如果（Build.VERSION.SDK_INT<19）{
Uri selectedImage=data.getData（）；
//System.out.println（“selectedImage”+selectedImage）；
字符串[]filePathColumn={MediaStore.Images.Media.DATA}；
Cursor Cursor=getContentResolver（）.query（selectedImage，filePathColumn，null，null）；
cursor.moveToFirst（）；
int columnIndex=cursor.getColumnIndex（filePathColumn[0]）；
smallImagePath=cursor.getString（columnIndex）；
cursor.close（）；
System.out.println（“smallImagePath”+smallImagePath）；
logoImg.setImageBitmap（BitmapFactory.decodeFile（smallImagePath））；
编码图像（）；
}
否则{
试一试{
InputStream imInputStream=getContentResolver（）.openInputStream（data.getData（））；
位图位图=位图工厂.decodeStream（imInputStream）；
smallImagePath=saveGalaryImageOnLitkat（位图）；
logoImg.setImageBitmap（BitmapFactory.decodeFile（smallImagePath））；
编码图像（）；
}catch（filenotfounde异常）{
e、 printStackTrace（）；
}
//finishAndSetResult（结果正常，图片路径，错误）；
}
}
}
}
私有文件临时路径；
私有最终整数压缩=100；
私有字符串saveGalaryImageOnLitkat（位图）{
试一试{
文件cacheDir；
if（Environment.getExternalStorageState（）.equals（Environment.MEDIA_MOUNTED））
cacheDir=新文件（Environment.getExternalStorageDirectory（），getResources（）.getString（R.string.app_name））；
其他的
cacheDir=getExternalFilesDir（Environment.DIRECTORY\u图片）；
如果（！cacheDir.exists（））
cacheDir.mkdirs（）；
字符串文件名=System.currentTimeMillis（）+“.jpg”；
File File=新文件（cacheDir，filename）；
temp_path=file.getAbsoluteFile（）；
//如果（！file.exists（））
createNewFile（）；
FileOutputStream out=新的FileOutputStream（文件）；
compress（bitmap.CompressFormat.JPEG，compress，out）；
复述
public Uri getImageUri(Context inContext, Bitmap inImage) {
ByteArrayOutputStream bytes = new ByteArrayOutputStream();
inImage.compress(Bitmap.CompressFormat.JPEG, 100, bytes);
String path = Images.Media.insertImage(inContext.getContentResolver(), inImage, "Title", null);
return Uri.parse(path);
}
txtlogochange.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 Picture"), 1);
}
});
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode == this.RESULT_OK) {
if (requestCode == 1) {
if (Build.VERSION.SDK_INT < 19) {
Uri selectedImage = data.getData();
// System.out.println("selectedImage "+selectedImage);
String[] filePathColumn = {MediaStore.Images.Media.DATA};
Cursor cursor = getContentResolver().query(selectedImage, filePathColumn, null, null, null);
cursor.moveToFirst();
int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
smallImagePath = cursor.getString(columnIndex);
cursor.close();
System.out.println("smallImagePath" + smallImagePath);
logoImg.setImageBitmap(BitmapFactory.decodeFile(smallImagePath));
encodeImage();
}
else {
try {
InputStream imInputStream = getContentResolver().openInputStream(data.getData());
Bitmap bitmap = BitmapFactory.decodeStream(imInputStream);
smallImagePath = saveGalaryImageOnLitkat(bitmap);
logoImg.setImageBitmap(BitmapFactory.decodeFile(smallImagePath));
encodeImage();
} catch (FileNotFoundException e) {
e.printStackTrace();
}
// finishAndSetResult(RESULT_OK, picturePath, false);
}
}
}
}
private File temp_path;
private final int COMPRESS = 100;
private String saveGalaryImageOnLitkat(Bitmap bitmap) {
try {
File cacheDir;
if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED))
cacheDir = new File(Environment.getExternalStorageDirectory(), getResources().getString(R.string.app_name));
else
cacheDir = getExternalFilesDir(Environment.DIRECTORY_PICTURES);
if (!cacheDir.exists())
cacheDir.mkdirs();
String filename = System.currentTimeMillis() + ".jpg";
File file = new File(cacheDir, filename);
temp_path = file.getAbsoluteFile();
// if(!file.exists())
file.createNewFile();
FileOutputStream out = new FileOutputStream(file);
bitmap.compress(Bitmap.CompressFormat.JPEG, COMPRESS, out);
return file.getAbsolutePath();
} catch (Exception e) {
e.printStackTrace();
}
return null;
}