我目前正在开发一个从 SQL Server 表中获取详细信息的 Android 应用程序。感谢之前帮助我了解 AsyncTasks 和 JSON 的所有人，我现在可以检索对象了。但是，我从 Android 设备更新表格的尝试并不顺利。
首先，我将从表开始：我有一个由触发器填充的 JobStatus 表，该触发器在将新记录输入到 Jobs 表时运行。运行触发器时，会填充这 4 列，即：-
- JobStatusID
- 作业 ID
- QLSJobID
- 工作类型
但是，其余 4 个默认为 null，预计将通过 Android 应用程序操作进行更新。他们是：-
- 纬度
- 经度
- 时间完成
- 日期完成
我已经改编了从这里获得的 WCF Web 服务来执行操作。它本质上是一个 POST 更新操作。
现在，对于 Android 代码。从本质上讲，Android 应用程序发生的情况是，仅当捕获保存/签名按钮时才会更新 JobStatus 条目。为此，用户必须输入他们的姓名并签署 Job，以便将所有信息发送回 JobStatus 表。这是代码：
package com.signonglass;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.TimeZone;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPut;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONArray;
import org.json.JSONObject;
import org.json.JSONStringer;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.ContextWrapper;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.DialogInterface.OnCancelListener;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.RectF;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.provider.MediaStore.Images;
import android.util.AttributeSet;
import android.util.Log;
import android.view.Gravity;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup.LayoutParams;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;
public class CaptureSignature extends Activity implements LocationListener
{
private final static String getJobURI = "http://192.168.0.105:8095/CentralMonitoring/CentralMonitor.svc/getJobStatus/";
private final static String jobURI = "http://192.168.0.105:8095/CentralMonitoring/CentralMonitor.svc/UpdateJobStatus";
final Date currentTime = new Date();
final SimpleDateFormat sdf = new SimpleDateFormat("EEE, MMM d, yyyy HH:mm:ss a z");
//Live Connections
//private final static String jobURI = "http://192.168.14.9:8092/CentralMonitoring/CentralMonitor.svc/UpdateJobStatus";
//private final static String getJobURI = "http://192.168.14.9:8092/CentralMonitoring/CentralMonitor.svc/getJobStatus/";
JSONStringer jobStatToUpdate;
LinearLayout mContent;
signature mSignature;
Button mClear, mGetSign, mCancel;
public static String tempDir;
public int count = 1;
public String current = null;
private Bitmap mBitmap;
View mView;
File mypath;
//additional variables for capturing details
Consignments cObj;
public Handler mHandler;
JobStatus js = new JobStatus();
JobStatus jsUpdate;
double latitude;
double longitude;
String datetime;
TextView tvLoc;
Location location;
String transAdd;
private String uniqueId;
private EditText yourName;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.signature);
cObj = (Consignments)this.getIntent().getSerializableExtra("Consignment");
//tempDir = Environment.getExternalStorageDirectory() + "/" + getResources().getString(R.string.external_dir) + "/";
ContextWrapper cw = new ContextWrapper(getApplicationContext());
File directory = cw.getDir(getResources().getString(R.string.external_dir), Context.MODE_PRIVATE);
prepareDirectory();
Calendar c = Calendar.getInstance();
c.setTimeZone(TimeZone.getDefault());
uniqueId = cObj.getJobType() + Integer.toString(cObj.getConsignmentID());
current = uniqueId + ".jpg";
mypath = new File(directory, current);
//Control Properties
mContent = (LinearLayout) findViewById(R.id.signing);
mSignature = new signature(this, null);
mSignature.setBackgroundColor(Color.WHITE);
mContent.addView(mSignature, LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
mClear = (Button)findViewById(R.id.clear);
mGetSign = (Button)findViewById(R.id.getsign);
mGetSign.setEnabled(false);
mCancel = (Button)findViewById(R.id.cancel);
mView = mContent;
yourName = (EditText)findViewById(R.id.yourName);
/* Use the LocationManager class to obtain GPS locations */
LocationManager mlocManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
Criteria criteria = new Criteria();
criteria.setAccuracy(Criteria.ACCURACY_FINE);
criteria.setPowerRequirement(Criteria.POWER_LOW);
String provider = mlocManager.getBestProvider(criteria, true);
location = mlocManager.getLastKnownLocation(provider);
mlocManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, CaptureSignature.this);
tvLoc = (TextView)findViewById(R.id.textView1);
tvLoc.setText("Latitude: "+ location.getLatitude() +", Longitude: "+ location.getLongitude());
mClear.setOnClickListener(new OnClickListener()
{
public void onClick(View v)
{
Log.v("log_tag", "Panel Cleared");
mSignature.clear();
mGetSign.setEnabled(false);
}
});
mGetSign.setOnClickListener(new OnClickListener()
{
public void onClick(View v)
{
Log.v("log_tag", "Panel Saved");
boolean error = captureSignature();
if(!error)
{
new updateJobStatus().execute(js);
mView.setDrawingCacheEnabled(true);
mSignature.save(mView);
Bundle b = new Bundle();
b.putString("status", "done");
Intent intent = new Intent();
intent.putExtras(b);
setResult(RESULT_OK,intent);
finish();
}
}
});
//Cancel method - to create pop up button
mCancel.setOnClickListener(new OnClickListener()
{
public void onClick(View v)
{
Log.v("log_tag", "Panel Canceled");
Bundle b = new Bundle();
b.putString("status", "cancel");
Intent intent = new Intent();
intent.putExtras(b);
setResult(RESULT_OK,intent);
finish();
}
});
new getJobStatus().execute(uniqueId);
}
public class getJobStatus extends AsyncTask<String, String, JobStatus>
{
private ProgressDialog progressDialog = new ProgressDialog(CaptureSignature.this);
InputStream inputStream = null;
String theString = "";
StringBuilder builder;
protected void onPreExecute()
{
progressDialog.setMessage("Getting " + uniqueId +" to be updated...");
progressDialog.show();
progressDialog.setOnCancelListener(new OnCancelListener()
{
public void onCancel(DialogInterface arg0)
{
getJobStatus.this.cancel(true);
}
});
}
@Override
protected JobStatus doInBackground(String... params)
{
try
{
DefaultHttpClient client = new DefaultHttpClient();
String theString = new String("");
//http get request
HttpGet request = new HttpGet(getJobURI + cObj.getJobType() + cObj.getConsignmentID());
//set the hedear to get the data in JSON format
request.setHeader("Accept", "application/json");
request.setHeader("Content-type", "application/json");
//get the response
HttpResponse response = client.execute(request);
HttpEntity entity = response.getEntity();
InputStream is = entity.getContent();
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
StringBuilder builder = new StringBuilder();
String line;
while ((line = reader.readLine()) != null)
{
builder.append(line);
}
is.close();
theString = builder.toString();
JSONObject jsObj = new JSONObject(theString);
JSONArray jstat = jsObj.getJSONArray("getJobStatusResult");
for(int i = 0; i < jstat.length(); i++)
{
JSONObject jst = jstat.getJSONObject(i);
js.JobStatusID = jst.getInt("JobStatusID");
js.JobID = jst.getInt("JobID");
js.JobType = jst.getString("jobType");
js.QlsJobID = jst.getInt("qlsJobID");
/*js.DateComplete = jst.getString("dateComplete");
js.TimeComplete = jst.getString("timeComplete");
js.Latitude = jst.getDouble("latitude");
js.Longitude = jst.getDouble("longitude");*/
}
}
catch(Exception e)
{
e.printStackTrace();
}
return js;
}
protected void onPostExecute(JobStatus jobStatus)
{
this.progressDialog.dismiss();
jsUpdate = js;
}
}
public class updateJobStatus extends AsyncTask<JobStatus, String, JSONStringer>
{
private ProgressDialog progressDialog = new ProgressDialog(CaptureSignature.this);
InputStream inputStream = null;
String theString = "";
StringBuilder builder;
protected void onPreExecute()
{
progressDialog.setMessage("Updating " + uniqueId +"...");
progressDialog.show();
progressDialog.setOnCancelListener(new OnCancelListener()
{
public void onCancel(DialogInterface arg0)
{
updateJobStatus.this.cancel(true);
}
});
}
@Override
protected JSONStringer doInBackground(JobStatus... arg0)
{
HttpPut request = new HttpPut(jobURI);
try
{
sdf.setTimeZone(TimeZone.getTimeZone("AEST"));
jobStatToUpdate = new JSONStringer()
.object()
.key("JobStatusID").value(js.getJobStatusID())
.key("JobID").value(js.getJobID())
.key("dateComplete").value(js.getDate())
.key("latitude").value(js.getLat())
.key("longitude").value(js.getClass())
.key("timeComplete").value(js.getTime())
.key("qlsjobID").value(js.getQLSID())
.endObject();
StringEntity entity = new StringEntity(jobStatToUpdate.toString());
request.setEntity(entity);
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpResponse response = httpClient.execute(request);
Log.d("WebInvoke", "Saving : " + response.getStatusLine().getStatusCode());
}
catch (Exception e)
{
e.printStackTrace();
}
return jobStatToUpdate;
}
}
@Override
protected void onDestroy()
{
//Log.w("GetSignature", "onDestory");
//super.onDestroy();
}
private boolean captureSignature()
{
boolean error = false;
String errorMessage = "";
if(yourName.getText().toString().equalsIgnoreCase(""))
{
errorMessage = errorMessage + "Please enter your Name\n";
error = true;
}
if(error)
{
Toast toast = Toast.makeText(this, errorMessage, Toast.LENGTH_SHORT);
toast.setGravity(Gravity.TOP, 105, 50);
toast.show();
}
return error;
}
private boolean prepareDirectory()
{
try
{
if (makedirs())
{
return true;
}
else
{
return false;
}
}
catch (Exception e)
{
e.printStackTrace();
Toast.makeText(this, "Could not initiate File System.. Is Sdcard mounted properly?", Toast.LENGTH_SHORT).show();
return false;
}
}
private boolean makedirs()
{
File tempdir = new File(tempDir);
if (!tempdir.exists())
tempdir.mkdirs();
if (tempdir.isDirectory())
{
File[] files = tempdir.listFiles();
for (File file : files)
{
if (!file.delete())
{
System.out.println("Failed to delete " + file);
}
}
}
return (tempdir.isDirectory());
}
public class signature extends View
{
private static final float STROKE_WIDTH = 5f;
private static final float HALF_STROKE_WIDTH = STROKE_WIDTH / 2;
private Paint paint = new Paint();
private Path path = new Path();
private float lastTouchX;
private float lastTouchY;
private final RectF dirtyRect = new RectF();
public signature(Context context, AttributeSet attrs)
{
super(context, attrs);
paint.setAntiAlias(true);
paint.setColor(Color.BLACK);
paint.setStyle(Paint.Style.STROKE);
paint.setStrokeJoin(Paint.Join.ROUND);
paint.setStrokeWidth(STROKE_WIDTH);
}
public void save(View v)
{
Log.v("log_tag", "Width: " + v.getWidth());
Log.v("log_tag", "Height: " + v.getHeight());
if(mBitmap == null)
{
mBitmap = Bitmap.createBitmap (mContent.getWidth(), mContent.getHeight(), Bitmap.Config.RGB_565);;
}
Canvas canvas = new Canvas(mBitmap);
try
{
FileOutputStream mFileOutStream = new FileOutputStream(mypath);
v.draw(canvas);
mBitmap.compress(Bitmap.CompressFormat.PNG, 90, mFileOutStream);
mFileOutStream.flush();
mFileOutStream.close();
String url = Images.Media.insertImage(getContentResolver(), mBitmap, "title", null);
Log.v("log_tag","url: " + url);
}
catch(Exception e)
{
Log.v("log_tag", e.toString());
}
}
public void clear()
{
path.reset();
invalidate();
}
@Override
protected void onDraw(Canvas canvas)
{
canvas.drawPath(path, paint);
}
@Override
public boolean onTouchEvent(MotionEvent event)
{
float eventX = event.getX();
float eventY = event.getY();
mGetSign.setEnabled(true);
switch (event.getAction())
{
case MotionEvent.ACTION_DOWN:
path.moveTo(eventX, eventY);
lastTouchX = eventX;
lastTouchY = eventY;
return true;
case MotionEvent.ACTION_MOVE:
case MotionEvent.ACTION_UP:
resetDirtyRect(eventX, eventY);
int historySize = event.getHistorySize();
for (int i = 0; i < historySize; i++)
{
float historicalX = event.getHistoricalX(i);
float historicalY = event.getHistoricalY(i);
expandDirtyRect(historicalX, historicalY);
path.lineTo(historicalX, historicalY);
}
path.lineTo(eventX, eventY);
break;
default:
debug("Ignored touch event: " + event.toString());
return false;
}
invalidate((int) (dirtyRect.left - HALF_STROKE_WIDTH),
(int) (dirtyRect.top - HALF_STROKE_WIDTH),
(int) (dirtyRect.right + HALF_STROKE_WIDTH),
(int) (dirtyRect.bottom + HALF_STROKE_WIDTH));
lastTouchX = eventX;
lastTouchY = eventY;
return true;
}
private void debug(String string)
{
}
private void expandDirtyRect(float historicalX, float historicalY)
{
if (historicalX < dirtyRect.left)
{
dirtyRect.left = historicalX;
}
else if (historicalX > dirtyRect.right)
{
dirtyRect.right = historicalX;
}
if (historicalY < dirtyRect.top)
{
dirtyRect.top = historicalY;
}
else if (historicalY > dirtyRect.bottom)
{
dirtyRect.bottom = historicalY;
}
}
private void resetDirtyRect(float eventX, float eventY)
{
dirtyRect.left = Math.min(lastTouchX, eventX);
dirtyRect.right = Math.max(lastTouchX, eventX);
dirtyRect.top = Math.min(lastTouchY, eventY);
dirtyRect.bottom = Math.max(lastTouchY, eventY);
}
}
@Override
public void onLocationChanged(Location mlocation)
{
tvLoc.setText("Latitude: "+ location.getLatitude() +", Longitude: "+ location.getLongitude());
}
@Override
public void onProviderDisabled(String provider)
{
// TODO Auto-generated method stub
Toast.makeText(getApplicationContext(), "GPS Disabled", Toast.LENGTH_SHORT ).show();
}
@Override
public void onProviderEnabled(String provider)
{
// TODO Auto-generated method stub
Toast.makeText(getApplicationContext(), "Gps Enabled", Toast.LENGTH_SHORT).show();
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras)
{
// TODO Auto-generated method stub
}
}
这里的代码是我从这里得到的代码的组合，并进行了一些修改。我已经注释掉了一些东西——它可能会导致错误，但在这一点上，我更着迷于更新 JobStatus 对象。
而且我确信上面的代码，尤其是 UpdateJobTask AsyncTask 需要大量修复。
我运行它没有任何错误，但无论哪种方式都是错误日志：-
05-29 10:33:37.214: W/dalvikvm(17704): threadid=1: thread exiting with uncaught exception (group=0x40f13258)
05-29 10:33:37.226: E/AndroidRuntime(17704): FATAL EXCEPTION: main
05-29 10:33:37.226: E/AndroidRuntime(17704): android.app.SuperNotCalledException: Activity {com.signonglass/com.signonglass.CaptureSignature} did not call through to super.onDestroy()
05-29 10:33:37.226: E/AndroidRuntime(17704): at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:3260)
05-29 10:33:37.226: E/AndroidRuntime(17704): at android.app.ActivityThread.handleDestroyActivity(ActivityThread.java:3289)
05-29 10:33:37.226: E/AndroidRuntime(17704): at android.app.ActivityThread.access$1200(ActivityThread.java:134)
05-29 10:33:37.226: E/AndroidRuntime(17704): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1280)
05-29 10:33:37.226: E/AndroidRuntime(17704): at android.os.Handler.dispatchMessage(Handler.java:99)
05-29 10:33:37.226: E/AndroidRuntime(17704): at android.os.Looper.loop(Looper.java:154)
05-29 10:33:37.226: E/AndroidRuntime(17704): at android.app.ActivityThread.main(ActivityThread.java:4624)
05-29 10:33:37.226: E/AndroidRuntime(17704): at java.lang.reflect.Method.invokeNative(Native Method)
05-29 10:33:37.226: E/AndroidRuntime(17704): at java.lang.reflect.Method.invoke(Method.java:511)
05-29 10:33:37.226: E/AndroidRuntime(17704): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:809)
05-29 10:33:37.226: E/AndroidRuntime(17704): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:576)
05-29 10:33:37.226: E/AndroidRuntime(17704): at dalvik.system.NativeStart.main(Native Method)
提前感谢您的提示和建议！:)