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我在我的Mainactivity中創建了一個帶空值和按鈕的Textview，並使用按鈕單擊上的AsyncTask方法從sql數據庫服務器獲取了一些數據並存儲到我的textview中。然後我打電話給另一個活動activity2來表示something.and我使用intent返回到Mainactivity。但是我不能在textview中查看以前設置的數據。它顯示空值。我想設置它以前提取data.how我可以設置？在調用意圖後將數據從數據庫提取到textview
公共類MainActivity延伸活動{
public ImageView prev, now, next;
String depvisitid;
public TextView display, bottom, ptname, docname;
public String tokenh,tokenext,tokennow;
public String pname,pnamenext,pnamenow;
public boolean status;
public String drname,current;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
prev = (ImageView) findViewById(R.id.previmg);
now = (ImageView) findViewById(R.id.token);
next = (ImageView) findViewById(R.id.nextimg);
display = (TextView) findViewById(R.id.textView2);
ptname = (TextView) findViewById(R.id.textView3);
bottom = (TextView) findViewById(R.id.tokennum);
docname = (TextView) findViewById(R.id.textView);
// Connect runner = new Connect();
// runner.execute();
prev.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// String sleepTime = time.getText().toString();
}
});
now.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
display.setText(tokenh);
ConnectNow nw = new ConnectNow();
nw.execute();
Intent i = new Intent(getApplicationContext(), StatusUpdate.class);
i.putExtra("patientname", pname);
i.putExtra("tokenno", tokenh);
i.putExtra("depvisitid", depvisitid);
startActivity(i);
}
});
next.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Connect runner = new Connect();
runner.execute();
}
});
}
public void onBackPressed() {
// TODO Auto-generated method stub
// super.onBackPressed();
// finish();
Intent intent = new Intent(Intent.ACTION_MAIN);
intent.addCategory(Intent.CATEGORY_HOME);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
finish();
}
class Connect extends AsyncTask<String, String, String> {
@Override
protected String doInBackground(String... params) {
try {
Class.forName("net.sourceforge.jtds.jdbc.Driver").newInstance();
} catch (InstantiationException e1) {
e1.printStackTrace();
} catch (IllegalAccessException e1) {
e1.printStackTrace();
} catch (ClassNotFoundException e1) {
e1.printStackTrace();
}
String username = "aaa";
String password = "sssss";
Connection DbConn = null;
try {
DbConn = DriverManager.getConnection("jdbc:jtds:sqlserver://xxx.xxx.x.x:1433/DATABASENAME;user=" + username + ";password=" + password);
Log.i("Connection", "openjjj");
} catch (SQLException e1) {
e1.printStackTrace();
}
Log.w("Connection", "open");
Statement stmt = null;
try {
stmt = DbConn.createStatement();
} catch (SQLException e1) {
e1.printStackTrace();
}
ResultSet reset1 = null;
try {
reset1 = stmt.executeQuery(" select a.TOKENNO,b.FNAME,a.TOKENSTATUS,e.EMPFNAME,a.DEPVISITID from DEPTVISIT a,PATIENT_MASTER b,APP_EMPLOYEE e where a.PID=b.PID and (a.TOKENSTATUS='O' or a.TOKENSTATUS='S') and e.EMPID=a.EMPID and a.EMPID=2 and CONVERT(date,a.OPDATE)='2016-05-09' order by TOKENNO desc;");
while (reset1.next()) {
tokenh = reset1.getString("TOKENNO");
pname = reset1.getString("FNAME");
drname = reset1.getString("EMPFNAME");
depvisitid= reset1.getString("DEPVISITID");
}
} catch (SQLException e1) {
e1.printStackTrace();
}
try {
DbConn.close();
} catch (SQLException e1) {
e1.printStackTrace();
}
return tokenh;
}
protected void onPostExecute(String result) {
bottom.setText(tokenh);
ptname.setText(pname);
docname.setText(drname);
}
}
class ConnectNow extends AsyncTask<String, String, Boolean> {
@Override
protected Boolean doInBackground(String... params) {
try {
Class.forName("net.sourceforge.jtds.jdbc.Driver").newInstance();
} catch (InstantiationException e1) {
e1.printStackTrace();
} catch (IllegalAccessException e1) {
e1.printStackTrace();
} catch (ClassNotFoundException e1) {
e1.printStackTrace();
}
String username = "aaaaa";
String password = "ssssss";
Connection DbConn = null;
try {
DbConn = DriverManager.getConnection("jdbc:jtds:sqlserver://xxx.xxx.x.x:1433/DATABASENAME;user=" + username + ";password=" + password);
Log.i("Connection", "openjjj****");
} catch (SQLException e1) {
e1.printStackTrace();
}
Log.w("Connection", "open****");
Statement stmt = null;
try {
stmt = DbConn.createStatement();
} catch (SQLException e1) {
e1.printStackTrace();
}
try {
int noOfRows = stmt.executeUpdate(" update DEPTVISIT set TOKENSTATUS='S' where DEPVISITID=" + depvisitid);
if (noOfRows > 0) {
status = true;
System.out.println("status updated to S");
}
} catch (SQLException e1) {
e1.printStackTrace();
}
try {
DbConn.close();
} catch (SQLException e1) {
e1.printStackTrace();
}
return status;
}
protected void onPostExecute(Boolean result) {
bottom.setText(tokenh);
ptname.setText(pnamenext);
docname.setText(drname);
}
}
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, 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();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
Intent settings=new Intent(getApplicationContext(),Settings.class);
startActivity(settings);
}
return super.onOptionsItemSelected(item);
}
}
第二個活動StatusUdate.java
公共類StatusUpdate延伸活動{ 公共字符串tokenstatN，tokenstatY;
Button visited, notvisited;
String pname,tokennum,depvisitid;
TextView patnam,tknum;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.statusupdate);
visited = (Button) findViewById(R.id.button);
notvisited = (Button) findViewById(R.id.button2);
patnam= (TextView) findViewById(R.id.textView4);
tknum= (TextView) findViewById(R.id.textView5);
Bundle extras = getIntent().getExtras();
pname = extras.getString("patientname");
tokennum = extras.getString("tokenno");
depvisitid = extras.getString("depvisitid");
patnam.setText(pname);
tknum.setText(tokennum);
visited.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Visit vt= new Visit();
vt.execute();
Intent i = new Intent(getApplicationContext(), MainActivity.class);
startActivity(i);
}
});
notvisited.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
NotVisit n = new NotVisit();
n.execute();
Intent i = new Intent(getApplicationContext(), MainActivity.class);
startActivity(i);
}
});
}
類NotVisit擴展的AsyncTask {
boolean status = false;
@Override
protected Boolean doInBackground(String... params) {
try {
Class.forName("net.sourceforge.jtds.jdbc.Driver").newInstance();
} catch (InstantiationException e1) {
e1.printStackTrace();
} catch (IllegalAccessException e1) {
e1.printStackTrace();
} catch (ClassNotFoundException e1) {
e1.printStackTrace();
}
String username = "aaaaa";
String password = "sssss";
Connection DbConn = null;
try {
DbConn = DriverManager.getConnection("jdbc:jtds:sqlserver://xxx.xxx.x.x:1433/DATABASENAME;user=" + username + ";password=" + password);
Log.i("Connection", "openhhhh");
} catch (SQLException e1) {
e1.printStackTrace();
}
Log.w("Connection", "openlll");
Statement stmt = null;
try {
stmt = DbConn.createStatement();
} catch (SQLException e1) {
e1.printStackTrace();
}
try {
int noOfRows = stmt.executeUpdate(" update DEPTVISIT set TOKENSTATUS='N' where DEPVISITID=" + depvisitid);
if (noOfRows > 0) {
status = true;
}
try {
DbConn.close();
} catch (SQLException e1) {
e1.printStackTrace();
}
} catch (SQLException e) {
e.printStackTrace();
}
Log.d("status", String.valueOf(status));
return status;
}
}
您是否正在完成活動？請顯示一些代碼。 –