0
每个人我都遇到将日历从日期传递到我的Create_Event.class的问题。最初textView显示“文本”,然后当我点击“选择日期”按钮时,日历页面将显示,日期应该被传递给最初显示“文本”的textView。我尝试使用intent.putExtra将日期从日历页面传递到Create_Events页面,但由于NullPointerException,我得到了强制关闭错误。任何人都可以帮我解决这个问题吗?非常感谢。从日历中选择日期后传递日期
作为参考,代码:
Calendar.java
@Override
public void onClick(View view)
{
String date_month_year = (String)view.getTag();
selectedDayMonthYearButton.setText(new StringBuilder().append("Selected:").append(date_month_year));
Intent k = new Intent(Calendar_Event.this, Create_Events.class);
k.putExtra("passdate", date_month_year);
startActivity(k);
Create_Event.java
Intent intent = this.getIntent();
if(intent == null)
{
String strdata = intent.getExtras().getString("passdate");
TextView txtDate = (TextView) findViewById(R.id.textDate);
txtDate.setText(strdata);
}
else
{
}
***本来如果(意向== NULL)是如果(意向!= null),我认为改变它会工作,但事实并非如此。 :P
更新了logcat的:
09-07 12:03:28.177: E/AndroidRuntime(1033): FATAL EXCEPTION: main
09-07 12:03:28.177: E/AndroidRuntime(1033): java.lang.RuntimeException: Unable to start activity ComponentInfo{main.page/main.page.Create_Events}: java.lang.NullPointerException
09-07 12:03:28.177: E/AndroidRuntime(1033): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)
09-07 12:03:28.177: E/AndroidRuntime(1033): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
09-07 12:03:28.177: E/AndroidRuntime(1033): at android.app.ActivityThread.access$600(ActivityThread.java:123)
09-07 12:03:28.177: E/AndroidRuntime(1033): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
09-07 12:03:28.177: E/AndroidRuntime(1033): at android.os.Handler.dispatchMessage(Handler.java:99)
09-07 12:03:28.177: E/AndroidRuntime(1033): at android.os.Looper.loop(Looper.java:137)
09-07 12:03:28.177: E/AndroidRuntime(1033): at android.app.ActivityThread.main(ActivityThread.java:4424)
09-07 12:03:28.177: E/AndroidRuntime(1033): at java.lang.reflect.Method.invokeNative(Native Method)
09-07 12:03:28.177: E/AndroidRuntime(1033): at java.lang.reflect.Method.invoke(Method.java:511)
09-07 12:03:28.177: E/AndroidRuntime(1033): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
09-07 12:03:28.177: E/AndroidRuntime(1033): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
09-07 12:03:28.177: E/AndroidRuntime(1033): at dalvik.system.NativeStart.main(Native Method)
09-07 12:03:28.177: E/AndroidRuntime(1033): Caused by: java.lang.NullPointerException
09-07 12:03:28.177: E/AndroidRuntime(1033): at main.page.Create_Events.onCreate(Create_Events.java:261)
09-07 12:03:28.177: E/AndroidRuntime(1033): at android.app.Activity.performCreate(Activity.java:4465)
09-07 12:03:28.177: E/AndroidRuntime(1033): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
09-07 12:03:28.177: E/AndroidRuntime(1033): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
任何帮助将不胜感激!再次感谢。
更新时间:
Bundle bundle = getIntent().getExtras();
if(bundle != null)
{
String date = bundle.getString("date");
TextView txtDate = (TextView) findViewById(R.id.textDate);
txtDate.setText(date);
}
您会在哪里得到错误?你能发布logcat错误吗? –
我想要打开Create_Events页面时出现错误。 nullPointerException错误将出现在上面的代码行onCreate上。 – CallMyName
行数261行Create_Events.java:261? –