Thanks, but I have same error.
New code is :
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
TextView tv = (TextView)this.findViewById(R.id.TextView01);
setContentView(tv);
tv.setText("Hello, Android\n");
}
Boh.....
2009/5/15 Robert <robert.li.ruim...@gmail.com>
> You can try it to move setcontextview() to the first line in oncreate
> function.good lock.
>
> Francesco Pace <paxa...@gmail.com>写道：
>
> >Thanks, but I have this error :
> >
> >ERROR/AndroidRuntime(1096): java.lang.RuntimeException: Unable to start
> >activity
> >ComponentInfo{com.cecco.android.hello/com.cecco.android.hello.HelloWorld}:
> >java.lang.NullPointerException: println needs a message
> >
> >in my code :
> >
> >public void onCreate(Bundle savedInstanceState) {
> > super.onCreate(savedInstanceState);
> >
> > TextView tv = (TextView)this.findViewById(R.id.TextView01);
> > tv.setText("Hello, Android\n");
> > setContentView(tv);
> > }
> >
> >But when I use this statement "TextView tv = new TextView(this) my
> >application running correctly.
> >My main.xml file is :
> >
> ><LinearLayout
> > android:id="@+id/LinearLayout01"
> > android:layout_width="fill_parent"
> > android:layout_height="fill_parent"
> > xmlns:android="
> http://schemas.android.com/apk/res/android
> >">
> > <TextView
> > android:text="TextView01"
> > android:id="@+id/TextView01"
> > android:layout_width="wrap_content"
> > android:layout_height="wrap_content">
> > </TextView>
> ></LinearLayout>
> >
> >and my R.java :
> >
> >public final class R {
> > public static final class attr {
> > }
> > public static final class drawable {
> > public static final int icon=0x7f020000;
> > }
> > public static final class id {
> > public static final int LinearLayout01=0x7f050000;
> > public static final int TextView01=0x7f050001;
> > }
> > public static final class layout {
> > public static final int main=0x7f030000;
> > }
> > public static final class string {
> > public static final int app_name=0x7f040001;
> > public static final int hello=0x7f040000;
> > }
> >
> >2009/5/15 iDeveloper <ideveloper...@gmail.com>
> >
> >> If you just want to print these on the activity, use a TextView and set
> its
> >> text to your sysouts
> >> TextView tv = (TextView)findViewById...
> >> tv.setText("Whatever you want to print");
> >>
> >>
> >>
> >>
> >> On 15-May-09, at 1:54 PM, Francesco Pace wrote:
> >>
> >> Hi, thanks.
> >> But I want print these informations on my android application......
> There
> >> is a particular UI?
> >>
> >> 2009/5/15 iDeveloper <ideveloper...@gmail.com>
> >>
> >>> You can use Log.d for printing debug statements to the LogCat and Log.e
> >>> for error statements.
> >>>
> >>>
> >>>
> >>>
> >>> On 15-May-09, at 1:25 PM, Francesco Pace wrote:
> >>>
> >>> Hi Mariano, thanks for your time.
> >>> Example :
> >>>
> >>> ///// CODE APPLICATION
> >>> *System.out.println("Hello");
> >>> foo1(); // Simple function
> >>> System.out.println("World");
> >>> foo2(); // Simple function
> >>> System.out.println("Today");
> >>> System.out.println("Yesterday");*
> >>>
> >>> I know that I can't use "System.out.println" on Android.
> >>>
> >>> ///// DISPLAY CONSOLE (NO WINDOW COMMAND LINE)
> >>> *- Hello
> >>> - World (after foo1())
> >>> - Today (after foo2())
> >>> - Yesterday*
> >>>
> >>> "adb -e logcat" display the output of the currently running emulator on
> >>> window command line, I need to show "logs" on interface.
> >>> Can you help me? Thanks for all.
> >>>
> >>> 2009/5/15 Mariano Kamp <mariano.k...@gmail.com>
> >>>
> >>>> Not sure if I understand you correctly.
> >>>> You can run "adb -e logcat" on the command line to display the output
> of
> >>>> the currently running emulator. Is that what are looking for?
> >>>>
> >>>>
> >>>> On Fri, May 15, 2009 at 9:32 AM, Francesco Pace <paxa...@gmail.com
> >wrote:
> >>>>
> >>>>> Hi developers,
> >>>>> I need a help. I need to display all Logcats Log on console of my
> >>>>> emulator, as do it the simple program "Hello World".
> >>>>> Can you help me?
> >>>>>
> >>>>>
> >>>>>
> >>>>
> >>>>
> >>>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>
> >>
> >>
> >>
> >>
> >> >
> >>
> >
> >>
>
> >
>
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