我决定使用Stripe API进行付款模拟。我做了一些事情。但是我在连接服务器时遇到了一些问题。首先，我添加一些信用卡信息然后我发送到服务器，从服务器发送到我在Stripe网站的帐户。对于后端，我使用了NodeJS。要连接到服务器，我请从Google阅读此documentation。顺便说一下，我为HTTPS做了这个认证。但是我对函数doInBackground有一些问题。 Android监视器向我显示doInBackground(DataBaseTask.java:211) - 它显示此行InputStream caInput = new BufferedInputStream(contexting.getAssets().open("cert.pem"));，其他代码行为class Example extends AsyncTask<String, Void, String>。请帮帮我。
这是我的代码：
public class DataBaseTask extends Activity{
String command = "";
Token token;
public DataBaseTask(String mCommand, Token mToken) {
command = mCommand;
token = mToken;
Log.e("Helloooo", "Helloooo DATABASETASK");
new Example().execute();
}
class Example extends AsyncTask<String, Void, String> {
@Override
protected void onPreExecute() {
super.onPreExecute();
Log.e("AsyncTask", "onPreExecute");
}
@Override
protected String doInBackground(String... params) {
final Context contexting = DataBaseTask.this;
Log.e("Context", contexting.toString());
Log.e("Stop here", "Stop here");
String echoData = "";
if (command.equals("SANDTOKEN")) {
try {
// Load CAs from an InputStream
// (could be from a resource or ByteArrayInputStream or ...)
CertificateFactory cf = CertificateFactory.getInstance("X.509");
// String fileName = "Download/cert.pem";
// String path = Environment.getExternalStorageDirectory()+"/"+fileName;
// File file = new File(path);
// FileInputStream fileInputStream = new FileInputStream(file);
InputStream caInput = new BufferedInputStream(contexting.getAssets().open("cert.pem"));
Certificate ca = cf.generateCertificate(caInput);
System.out.println("ca=" + ((X509Certificate) ca).getSubjectDN());
Log.e("ca", "ca= " + ((X509Certificate) ca).getSubjectDN());
// Create a KeyStore containing our trusted CAs
String keyStoreType = KeyStore.getDefaultType();
KeyStore keyStore = KeyStore.getInstance(keyStoreType);
keyStore.load(null, null);
keyStore.setCertificateEntry("ca", ca);
// Create a TrustManager that trusts the CAs in our KeyStore
String tmfAlgorithm = TrustManagerFactory.getDefaultAlgorithm();
TrustManagerFactory tmf = TrustManagerFactory.getInstance(tmfAlgorithm);
tmf.init(keyStore);
// Create an SSLContext that uses our TrustManager
SSLContext context = SSLContext.getInstance("TLS");
context.init(null, tmf.getTrustManagers(), null);
// Tell the URLConnection to use a SocketFactory from our SSLContext
//URL url = new URL(urlString);
URL url = new URL("https://Address:4567/charge");
HttpsURLConnection connection = (HttpsURLConnection) url.openConnection();
connection.setSSLSocketFactory(context.getSocketFactory());
StringBuilder builder = new StringBuilder();
builder.append(URLEncoder.encode("stripeToken", "UTF-8"));
builder.append("=");
builder.append(URLEncoder.encode(token.getId(), "UTF-8"));
String urlParameters = builder.toString();
Log.e("String param ", urlParameters);
connection.setRequestMethod("POST");
connection.setDoOutput(true);
DataOutputStream dStream = new DataOutputStream(connection.getOutputStream());
dStream.writeBytes(urlParameters);
dStream.flush();
dStream.close();
BufferedReader br = new BufferedReader(new InputStreamReader(connection.getInputStream()));
String line = "";
StringBuilder responseOutput = new StringBuilder();
while ((line = br.readLine()) != null) {
Log.e("DatabaseTask", line);
responseOutput.append(line);
}
br.close();
echoData = responseOutput.toString();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (CertificateException e) {
e.printStackTrace();
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (KeyStoreException e) {
e.printStackTrace();
} catch (KeyManagementException e) {
e.printStackTrace();
} catch (NullPointerException e) {
e.printStackTrace();
}
}
return echoData;
}
@Override
protected void onPostExecute(String mData) {
Log.e("DatabaseTask", "onPostExecute result: " + mData);
}
}
}
这是错误：
/com.example.lado.banksystem W/System.err: java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.res.Resources android.content.Context.getResources()' on a null object reference
04-16 18:43:43.028 9539-10081/com.example.lado.banksystem W/System.err: at android.content.ContextWrapper.getResources(ContextWrapper.java:86)
04-16 18:43:43.028 9539-10081/com.example.lado.banksystem W/System.err: at android.view.ContextThemeWrapper.getResourcesInternal(ContextThemeWrapper.java:127)
04-16 18:43:43.028 9539-10081/com.example.lado.banksystem W/System.err: at android.view.ContextThemeWrapper.getAssets(ContextThemeWrapper.java:116)
04-16 18:43:43.028 9539-10081/com.example.lado.banksystem W/System.err: at com.example.lado.banksystem.DataBaseTask$Example.doInBackground(DataBaseTask.java:211)
04-16 18:43:43.028 9539-10081/com.example.lado.banksystem W/System.err: at com.example.lado.banksystem.DataBaseTask$Example.doInBackground(DataBaseTask.java:184)
04-16 18:43:43.028 9539-10081/com.example.lado.banksystem W/System.err: at android.os.AsyncTask$2.call(AsyncTask.java:305)
04-16 18:43:43.028 9539-10081/com.example.lado.banksystem W/System.err: at java.util.concurrent.FutureTask.run(FutureTask.java:237)
04-16 18:43:43.028 9539-10081/com.example.lado.banksystem W/System.err: at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:243)
04-16 18:43:43.028 9539-10081/com.example.lado.banksystem W/System.err: at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
04-16 18:43:43.028 9539-10081/com.example.lado.banksystem W/System.err: at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
04-16 18:43:43.028 9539-10081/com.example.lado.banksystem W/System.err: at java.lang.Thread.run(Thread.java:761)
04-16 18:43:43.038 9539-9539/com.example.lado.banksystem E/DatabaseTask: onPostExecute result:
04-16 18:43:43.276 1348-1399/? W/audio_hw_generic: Not supplying enough data to HAL, expected position 1453867 , only wrote 1301760
04-16 18:43:43.577 1648-1648/? W/WindowManager: Attempted to remove non-existing token: android.os.Binder@ab7749
04-16 18:43:43.641 9539-9566/com.example.lado.banksystem D/EGL_emulation: eglMakeCurrent: 0xaf805120: ver 2 0 (tinfo 0xaf803700)
04-16 18:43:43.721 9539-9566/com.example.lado.banksystem D/EGL_emulation: eglMakeCurrent: 0xaf805120: ver 2 0 (tinfo 0xaf803700)
04-16 18:43:47.087 1648-1648/? W/WindowManager: Attempted to remove non-existing token: android.os.Binder@2d0384e
04-16 18:43:47.090 1648-1648/? I/ActivityManager: Killing 4486:com.google.android.videos/u0a72 (adj 906): empty #17
04-16 18:43:47.142 1648-2092/? D/ActivityManager: cleanUpApplicationRecord -- 4486
04-16 18:43:47.177 9539-9566/com.example.lado.banksystem D/EGL_emulation: eglMakeCurrent: 0xaf805120: ver 2 0 (tinfo 0xaf803700)
04-16 18:43:47.239 9539-9566/com.example.lado.banksystem D/EGL_emulation: eglMakeCurrent: 0xaf805120: ver 2 0 (tinfo 0xaf803700)
04-16 18:43:50.599 1648-1648/? W/WindowManager: Attempted to remove non-existing token: android.os.Binder@c2bf18b
04-16 18:44:00.020 1718-1933/? D/EGL_emulation: eglMakeCurrent: 0xaf805840: ver 2 0 (tinfo 0x8fb08040)
04-16 18:45:56.131 2426-4002/? I/PlayCommon: [160] com.google.android.play.b.h.e(263): Preparing logs for uploading
04-16 18:45:56.131 2426-4002/? I/PlayCommon: [160] com.google.android.play.b.h.e(267): No file ready to send
04-16 18:46:34.768 1648-1657/? W/art: Suspending all threads took: 5.309ms
04-16 18:46:34.783 1648-1657/? I/art: Background sticky concurrent mark sweep GC freed 31001(3MB) AllocSpace objects, 3(156KB) LOS objects, 14% free, 16MB/18MB, paused 6.889ms total 39.977ms
04-16 18:47:23.958 2453-2683/? W/BasePeopleOperation: READ_CONTACTS permission is missing. Skipping loadCp2DataInner()
04-16 18:47:25.306 2453-2679/? I/Icing: Indexing CB8C5EB878248DCF0E1D4B215E247F81A7F25A76 from com.google.android.apps.docs
04-16 18:47:25.312 2453-2679/? I/Icing: Not enough disk space for indexing trimmable
04-16 18:47:25.312 2453-2679/? I/Icing: Cannot sync trimmable corpus: no trimmable
04-16 18:47:25.312 2453-2679/? I/Icing: Indexing done CB8C5EB878248DCF0E1D4B215E247F81A7F25A76
04-16 18:47:25.312 2453-2679/? E/Icing: Aborting indexing of corpus internal.3p:DigitalDocument
04-16 18:47:25.314 2453-2679/? I/Icing: Indexing 2823A4E8E883823DE65F5628FB978D4BAB6FAF3D from com.google.android.apps.docs
04-16 18:47:25.314 2453-2679/? I/Icing: Not enough disk space for indexing trimmable
04-16 18:47:25.314 2453-2679/? I/Icing: Cannot sync trimmable corpus: no trimmable
04-16 18:47:25.314 2453-2679/? I/Icing: Indexing done 2823A4E8E883823DE65F5628FB978D4BAB6FAF3D
04-16 18:47:25.314 2453-2679/? E/Icing: Aborting indexing of corpus internal.3p:SpreadsheetDigitalDocument
04-16 18:47:25.314 2453-2679/? I/Icing: Indexing 1025AB1BD34441691C05DD1956DAC0055E9B9892 from com.google.android.apps.docs
04-16 18:47:25.315 2453-2679/? I/Icing: Not enough disk space for indexing trimmable
04-16 18:47:25.315 2453-2679/? I/Icing: Cannot sync trimmable corpus: no trimmable
04-16 18:47:25.315 2453-2679/? I/Icing: Indexing done 1025AB1BD34441691C05DD1956DAC0055E9B9892
04-16 18:47:25.315 2453-2679/? E/Icing: Aborting indexing of corpus internal.3p:PresentationDigitalDocument
04-16 18:47:25.315 2453-2679/? I/Icing: Indexing 32815EDB0F7643A5A6F997853ED4BC43CC823D2A from com.google.android.apps.docs
04-16 18:47:25.315 2453-2679/? I/Icing: Not enough disk space for indexing trimmable
04-16 18:47:25.315 2453-2679/? I/Icing: Cannot sync trimmable corpus: no trimmable
04-16 18:47:25.315 2453-2679/? I/Icing: Indexing done 32815EDB0F7643A5A6F997853ED4BC43CC823D2A
04-16 18:47:25.315 2453-2679/? E/Icing: Aborting indexing of corpus internal.3p:TextDigitalDocument
04-16 18:47:25.387 2453-2679/? I/Icing: Indexing CB8C5EB878248DCF0E1D4B215E247F81A7F25A76 from com.google.android.apps.docs
04-16 18:47:25.387 2453-2679/? I/Icing: Not enough disk space for indexing trimmable
04-16 18:47:25.387 2453-2679/? I/Icing: Cannot sync trimmable corpus: no trimmable
04-16 18:47:25.387 2453-2679/? I/Icing: Indexing done CB8C5EB878248DCF0E1D4B215E247F81A7F25A76
04-16 18:47:25.387 2453-2679/? E/Icing: Aborting indexing of corpus internal.3p:DigitalDocument
04-16 18:47:25.388 2453-2679/? I/Icing: Indexing 1025AB1BD34441691C05DD1956DAC0055E9B9892 from com.google.android.apps.docs
04-16 18:47:25.388 2453-2679/? I/Icing: Not enough disk space for indexing trimmable
04-16 18:47:25.388 2453-2679/? I/Icing: Cannot sync trimmable corpus: no trimmable
04-16 18:47:25.388 2453-2679/? I/Icing: Indexing done 1025AB1BD34441691C05DD1956DAC0055E9B9892
04-16 18:47:25.388 2453-2679/? E/Icing: Aborting indexing of corpus internal.3p:PresentationDigitalDocument
04-16 18:47:25.391 2453-2679/? I/Icing: Indexing 2823A4E8E883823DE65F5628FB978D4BAB6FAF3D from com.google.android.apps.docs
04-16 18:47:25.391 2453-2679/? I/Icing: Not enough disk space for indexing trimmable
04-16 18:47:25.391 2453-2679/? I/Icing: Cannot sync trimmable corpus: no trimmable
04-16 18:47:25.391 2453-2679/? I/Icing: Indexing done 2823A4E8E883823DE65F5628FB978D4BAB6FAF3D
04-16 18:47:25.391 2453-2679/? E/Icing: Aborting indexing of corpus internal.3p:SpreadsheetDigitalDocument
04-16 18:47:25.393 2453-2679/? I/Icing: Indexing 32815EDB0F7643A5A6F997853ED4BC43CC823D2A from com.google.android.apps.docs
04-16 18:47:25.394 2453-2679/? I/Icing: Not enough disk space for indexing trimmable
04-16 18:47:25.394 2453-2679/? I/Icing: Cannot sync trimmable corpus: no trimmable
04-16 18:47:25.394 2453-2679/? I/Icing: Indexing done 32815EDB0F7643A5A6F997853ED4BC43CC823D2A
04-16 18:47:25.394 2453-2679/? E/Icing: Aborting indexing of corpus internal.3p:TextDigitalDocument
04-16 18:48:44.116 1648-1990/? W/AlarmManager: Window length 3074457345618258602ms suspiciously long; limiting to 1 hour
04-16 18:50:56.225 2426-4002/? I/PlayCommon: [160] com.google.android.play.b.h.e(263): Preparing logs for uploading
04-16 18:50:56.226 2426-4002/? I/PlayCommon: [160] com.google.android.play.b.h.e(267): No file ready to send
答案 0 :(得分：0)
为“DataBaseTask”类创建一个扩展AsyncTask（不是extends Activity）的新文件：
public class DataBaseTask extends AsyncTask<String, Void, String> {
private static final String TAG = "DataBaseTask";
// Just in case you want a ProgressDialog uncomment this and the associated code
//private ProgressDialog pDialog;
private DataBaseTaskListener mListener;
Context mContext;
String mCommand = "";
Token mToken;
public DataBaseTask(Context context, String command, Token token, DataBaseTaskListener listener){
this.mContext = context;
this.mCommand = command;
this.mToken = token;
this.mListener = listener;
}
@Override
protected String doInBackground(String... params) {
String result = "";
try{
// Put your code here!!
}
catch(Exception ex){
Log.e(TAG, ex.getMessage());
}
return result;
}
@Override
protected void onPostExecute(String result) {
try{
// In case you want a ProgressDialog
//pDialog.dismiss();
// Trigger the listener for the call back sending the result
mListener.onCompletedSendData(result);
Log.e(TAG, "onPostExecute result: " + mData);
}
catch(Exception ex){
Log.e(TAG, ex.getMessage());
}
}
@Override
protected void onPreExecute() {
super.onPreExecute();
// In case you want a ProgressDialog
//pDialog = new ProgressDialog(context);
//pDialog.setMessage("Sending Data...");
//pDialog.setIndeterminate(false);
//pDialog.setCancelable(false);
//pDialog.show();
}
}
您可以创建一个新的java文件并将其命名为“DataBaseTaskListener”，也可以将其添加到“DataBaseTask”类中。我通常只是制作一个新文件。
public interface DataBaseTaskListener {
void onCompletedSendData(String result);
}
现在您可以从任何地方调用新的“DataBaseTask”。这里我有一个使用onClick事件来调用新的“DataBaseTask”AsyncTask的示例。
public void onClickDataBaseAsyncTask(View view){
try{
DataBaseTaskListener listener = new DataBaseTaskListener() {
@Override
public void onCompletedSendData(String result) {
//Do what you need with the data
}
};
DataBaseTask c = new DataBaseTask(YourCallingActivity.this, yourCommand, yourToken, listener);
c.execute();
}
catch (Exception ex){
Log.e(TAG, ex.getMessage());
}
}