我已经提到了sample。
一次将多个文件上传到服务器，同时单击上传按钮。
但我得到了selectedpath1和selectedpath2空指针异常。我不知道如何解决这个问题。任何人都可以帮助我。谢谢。
logcat的：
02-12 02:12:15.001: E/selectedImageUri(11964): content://com.android.providers.media.documents/document/image%3A388
02-12 02:12:15.006: E/selectedPath1(11964): null
02-12 02:12:26.949: E/selectedImageUri(11964): content://com.android.providers.media.documents/document/image%3A388
02-12 02:12:26.956: E/selectedPath2(11964): null
MainActivity.java：
public class MainActivity extends Activity {
private static final int SELECT_FILE1 = 1;
private static final int SELECT_FILE2 = 2;
String selectedPath1;
String selectedPath2;
TextView tv, res;
ProgressDialog progressDialog;
Button b1, b2, b3;
HttpEntity resEntity;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tv = (TextView) findViewById(R.id.tv);
res = (TextView) findViewById(R.id.res);
tv.setText(tv.getText() + selectedPath1 + "," + selectedPath2);
b1 = (Button) findViewById(R.id.Button01);
b2 = (Button) findViewById(R.id.Button02);
b3 = (Button) findViewById(R.id.upload);
b1.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
openGallery(SELECT_FILE1);
}
});
b2.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
openGallery(SELECT_FILE2);
}
});
b3.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if (!(selectedPath1.equals(""))
&& !(selectedPath2.equals(""))) {
progressDialog = ProgressDialog.show(MainActivity.this,
"", "Uploading files to server.....", false);
Thread thread = new Thread(new Runnable() {
public void run() {
doFileUpload();
runOnUiThread(new Runnable() {
public void run() {
if (progressDialog.isShowing())
progressDialog.dismiss();
}
});
}
});
thread.start();
} else {
Toast.makeText(getApplicationContext(),
"Please select two files to upload.",
Toast.LENGTH_SHORT).show();
}
}
});
}
public void openGallery(int req_code) {
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(
Intent.createChooser(intent, "Select file to upload "),
req_code);
}
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode == RESULT_OK) {
Uri selectedImageUri = data.getData();
Log.e("selectedImageUri", ""+selectedImageUri);
if (requestCode == SELECT_FILE1) {
selectedPath1 = getPath(selectedImageUri); -->path is Null
Log.e("selectedPath1", ""+selectedPath1);
}
if (requestCode == SELECT_FILE2) {
selectedPath2 = getPath(selectedImageUri);
Log.e("selectedPath2", ""+selectedPath2);
}
tv.setText("Selected File paths : " + selectedPath1 + ","
+ selectedPath2);
}
}
public String getPath(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);
}
private void doFileUpload() {
File file1 = new File(selectedPath1);
File file2 = new File(selectedPath2);
String urlString = "http://10.0.2.2/upload_test/upload_media_test.php";
try {
HttpClient client = new DefaultHttpClient();
HttpPost post = new HttpPost(urlString);
FileBody bin1 = new FileBody(file1);
FileBody bin2 = new FileBody(file2);
MultipartEntity reqEntity = new MultipartEntity();
reqEntity.addPart("uploadedfile1", bin1);
reqEntity.addPart("uploadedfile2", bin2);
reqEntity.addPart("user", new StringBody("User"));
post.setEntity(reqEntity);
HttpResponse response = client.execute(post);
resEntity = response.getEntity();
final String response_str = EntityUtils.toString(resEntity);
if (resEntity != null) {
Log.i("RESPONSE", response_str);
runOnUiThread(new Runnable() {
public void run() {
try {
res.setTextColor(Color.GREEN);
res.setText("n Response from server : n "
+ response_str);
Toast.makeText(
getApplicationContext(),
"Upload Complete. Check the server uploads directory.",
Toast.LENGTH_LONG).show();
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
} catch (Exception ex) {
Log.e("Debug", "error: " + ex.getMessage(), ex);
}
}
}
activity_main.xml中：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Multiple File Upload from CoderzHeaven" />
<Button
android:id="@+id/Button01"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Get First File" >
</Button>
<Button
android:id="@+id/Button02"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Get Second File" >
</Button>
<Button
android:id="@+id/upload"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Start Upload" >
</Button>
<TextView
android:id="@+id/tv"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Selected File path : " />
<TextView
android:id="@+id/res"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="" />
</LinearLayout>
答案 0 :(得分：0)
返回的内容URI可能会有所不同，具体取决于选择的位置。特别是自推出存储访问框架（SAF）的Kitkat（API级别19）以来，您可以在选择照片时查看所有文档存储提供程序。 此问题（及其修复）已在以下StackOverflow线程中解决：
Android Gallery on KitKat returns different Uri for Intent.ACTION_GET_CONTENT
retrieve absolute path when select image from gallery kitkat android
或者您只需执行以下操作： -
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == Activity.RESULT_OK) {
InputStream inputStream = context.getContentResolver().openInputStream(data.getData());
//Now you can do whatever you want with your inpustream, save it as file, upload to a server
}
}