我有3个EditText字段设置方式如下:
<EditText
android:id="@+id/evnttitle"
android:layout_width="200dp"
android:layout_height="wrap_content"
android:background="#ffffff"
android:inputType="textNoSuggestions"
android:textColor="#000000"
android:textCursorDrawable="@null"
android:layout_marginBottom="20dp">
<requestFocus />
</EditText>
在我的代码中,他们在onCreate之外设置如下:
EditText titlecap;
然后在我的一个方法中,我有这个:
titlecap = (EditText) findViewById(R.id.evnttitle);
CharSequence titleconv = titlecap.getText();
addAppt(timeconv.toString(), titleconv.toString(), ...
这是我现在尝试过的众多方法之一,因为我似乎无法从edittext字段中获取字符串,我一直得到空指针异常,这个版本是我尝试分配给字符序列的地方。如何将EditTexts中键入的内容作为字符串?
logcat的:
LogCat as text:
FATAL EXCEPTION: main
java.lang.NullPointerException
at w1279057.CW2.CW2Organisor$2.onClick(CW2Organisor.java:88)
at android.view.View.performClick(View.java:3511)
at android.view.View$PerformClick.run(View.java:14105)
at android.os.Handler.handleCallback(Handler.java:605)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4424)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
at dalvik.system.NativeStart.main(Native Method)
添加了OnCreate:
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
View createappt = findViewById(R.id.newappt);
createappt.setOnClickListener(this);
View delappt = findViewById(R.id.delappt);
delappt.setOnClickListener(this);
calendar = (CalendarView) findViewById(R.id.cal);
appts = new ApptsData(this);
}
完全点击方法:
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.newappt:
final Dialog dialog = new Dialog(this);
dialog.setContentView(R.layout.poptest);
dialog.setTitle("Create New Appointment");
dialog.setCancelable(true);
Button buttoncancel = (Button) dialog.findViewById(R.id.Button01);
buttoncancel.setOnClickListener(new OnClickListener() {
// on click for cancel button
@Override
public void onClick(View v) {
dialog.dismiss();
}
});
Button buttonsave = (Button) dialog.findViewById(R.id.Button02);
buttonsave.setOnClickListener(new OnClickListener() {
// on click for save button
@Override
public void onClick(View v) {
timecap = (EditText) findViewById(R.id.evnttime);
titlecap = (EditText) findViewById(R.id.evnttitle);
detcap = (EditText) findViewById(R.id.evntdet);
CharSequence timeconv = timecap.getText();
CharSequence titleconv = titlecap.getText();
CharSequence detconv = detcap.getText();
cursor = getAppts();
addAppt(timeconv.toString(), titleconv.toString(), detconv.toString());
showAppts(cursor);
dialog.dismiss();
}
});
dialog.show();
break;
case R.id.delappt:
rmvall();
break;
}
}
答案 0 :(得分:1)
不要制作
查看createappt并查看onCreate()
本地的delappt
在它之外创建它们,以便它可以在类中的任何地方访问。
View createappt = null;
View delappt = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
createappt = findViewById(R.id.newappt);
createappt.setOnClickListener(this);
delappt = findViewById(R.id.delappt);
delappt.setOnClickListener(this);
calendar = (CalendarView) findViewById(R.id.cal);
appts = new ApptsData(this);
}
添加更新
// on click for save button
@Override
public void onClick(View v) {
String strTime = ((EditText) dialog.findViewById(R.id.evnttime)).getText();
String strTitle = ((EditText) dialog.findViewById(R.id.evnttitle)).getText();
String strDet = ((EditText) dialog.findViewById(R.id.evntdet)).getText();
cursor = getAppts();
addAppt(strTime, strTitle, strDet);
showAppts(cursor);
dialog.dismiss();
}