你好我正在创建一个填充表单的android应用程序,并以字符串的形式将详细信息发送到服务器端的php脚本。但问题是我无法提取或提取EditText字段的任何新值。请帮忙.. 我的代码有点像这样..
EditText id_st1_event_edit,id_st1_date_edit,id_st1_time_edit,id_st1_venue_edit;
EditText id_st2_name_edit,id_st2_phone_edit,id_st2_phone_edit2,id_st2_email_edit,id_st2_email_edit2;
EditText id_st3_desc_edit;
//Declaration of static IP Address of the server side
public static String addr = "10.0.2.2";
public String sendsentence;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//Attaching the entities with their proper ID Components
welcome=(TextView)findViewById(R.id.welcome_message);
create_event=(TextView)findViewById(R.id.id_create_event);
browse_event=(TextView)findViewById(R.id.id_browse_event);
about_us=(TextView)findViewById(R.id.id_about_us);
id_st1_time=(TextView)findViewById(R.id.id_st1_time);
id_st1_venue=(TextView)findViewById(R.id.id_st1_venue);
id_st1_event=(TextView)findViewById(R.id.id_st1_event);
id_st1_date=(TextView)findViewById(R.id.id_st1_date);
id_st1_next=(TextView)findViewById(R.id.id_st1_next);
id_st2_name=(TextView)findViewById(R.id.id_st2_name);
id_st2_phone=(TextView)findViewById(R.id.id_st2_phone);
id_st2_email=(TextView)findViewById(R.id.id_st2_email);
about_organiser=(TextView)findViewById(R.id.about_organiser);
id_st3_event_description=(TextView)findViewById(R.id.id_st3_event_description);
id_st1_time_edit=(EditText)findViewById(R.id.id_st1_time_edit);
id_st1_date_edit=(EditText)findViewById(R.id.id_st1_date_edit);
id_st1_event_edit=(EditText)findViewById(R.id.id_st1_event_edit);
id_st1_venue_edit=(EditText)findViewById(R.id.id_st1_venue_edit);
id_st2_name_edit=(EditText)findViewById(R.id.id_st2_name_edit);
id_st2_phone_edit=(EditText)findViewById(R.id.id_st2_phone_edit);
id_st2_phone_edit2=(EditText)findViewById(R.id.id_st2_phone_edit2);
id_st2_email_edit=(EditText)findViewById(R.id.id_st2_email_edit);
id_st2_email_edit2=(EditText)findViewById(R.id.id_st2_email_edit2);
id_st3_desc_edit=(EditText)findViewById(R.id.id_st3_desc_edit);
butt_submit=(Button)findViewById(R.id.butt_submit);
}
public void onBackPressed() {
Toast.makeText(getApplicationContext()," Exiting Application ", Toast.LENGTH_SHORT).show();
finish();
}
@Override
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;
}
public void createNew(View V)
{
setContentView(R.layout.create_new_event);
tabhost= (TabHost)findViewById(R.id.tabhost);
tabhost.setup();
TabHost.TabSpec spec;
spec=tabhost.newTabSpec("tag1");
spec.setContent(R.id.tab1);
spec.setIndicator("Step 1");
tabhost.addTab(spec);
spec=tabhost.newTabSpec("tag2");
spec.setContent(R.id.tab2);
spec.setIndicator("Step 2");
tabhost.addTab(spec);
spec=tabhost.newTabSpec("tag3");
spec.setContent(R.id.tab3);
spec.setIndicator("Step 3");
tabhost.addTab(spec);
}
public void aboutUs(View V)
{
setContentView(R.layout.about_us);
}
public void browseEvent(View V)
{
setContentView(R.layout.browse_new);
}
public void to_next(View v)
{
tabhost= (TabHost)findViewById(R.id.tabhost);
tabhost.setCurrentTab((tabhost.getCurrentTab())+1);
}
public void to_previous(View v)
{
tabhost= (TabHost)findViewById(R.id.tabhost);
tabhost.setCurrentTab((tabhost.getCurrentTab())-1);
}
public void submit_data(View V)
{
try{
new DoSocketProgramming(this).execute("10.0.2.2");
}
catch(Exception e){
Toast.makeText(getApplicationContext(), "problem here", Toast.LENGTH_SHORT).show();
}
Toast.makeText(getApplicationContext(), "created till here", Toast.LENGTH_SHORT).show();
}
public class DoSocketProgramming extends AsyncTask<String, Void, String>
{
String sendsentence="create table ";
String recvsentence;
Context context;
//sendsentence=id_st1_event_edit.getText().toString();
private DoSocketProgramming(Context context){
this.context = context;
}
protected void onPreExecute()
{
Toast.makeText(getApplicationContext(), "this is preExecute", Toast.LENGTH_LONG).show();
}
protected String doInBackground(String... params) {
// TODO Auto-generated method stub
try{
Socket con=new Socket(addr,1678);
DataInputStream dis= new DataInputStream(con.getInputStream());
DataOutputStream dos=new DataOutputStream(con.getOutputStream());
dos.writeUTF(sendsentence);
recvsentence=dis.readUTF();
}catch(Exception e)
{
e.printStackTrace();
}
Log.d("myApp","i've reached at doinbackground");
return recvsentence;
}
protected void onPostExecute(String result) {
try{
Log.d("myApp","i've reached on PostExecute");
Toast.makeText(context, "this is post execute "+ result, Toast.LENGTH_LONG).show();
}
catch(Exception e)
{
e.printStackTrace();
}
}
}}
&#34; sendsentence&#34;在上面的php端正确显示了DoSocketProgramming类,但是当我尝试使用GetText()或SetText()函数向它添加一些Text时,我的应用程序崩溃了。 我该怎么办?
答案 0 :(得分:1)
这个问题并没有太大的余地,但我会试一试。
显示使用getText()
的唯一一行就是这一行......
//sendsentence=id_st1_event_edit.getText().toString();
正如对该问题的评论所述,最可能的原因是NullPointerException
。如果是这种情况,则id_st1_event_edit
为空。
如果是这种情况,那么onCreate(...)
id_st1_date_edit=(EditText)findViewById(R.id.id_st1_date_edit);
...未能找到资源ID为EditText
的{{1}},表明特定的R.id.id_st1_date_edit
不在您的EditText
布局文件中。
请记住,您在几个地方调用activity_main.xml
我猜它实际上位于setContentView(...)
布局文件(或其他布局文件)中。
如果是这种情况,那么您的问题是您只能使用browse_new.xml
在当前内容视图中查找视图。将对findViewById(...)
的调用移动到更改内容视图的方法。实施例...
findViewById(...)
答案 1 :(得分:0)
使用此代码在不创建对象i的情况下获取TextView的值。 e。通过findViewById(int)方法:
String text = ((TextView)findViewById(R.id.testtextview)).getText().toString();