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 <[email protected]>
> 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 <[email protected]>
>
>> 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 <[email protected]>
>>
>>> 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 <[email protected]>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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