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POHow can i add a TextView to an existing RelativeLayout programmatically?
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  1. POHow can i add a TextView to an existing RelativeLayout programmatically?
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    copied!<p>I've searched for other similiar questions, and i've found some, but strangely they don't work for me, and i don't know what i'm doing wrong...</p> <pre><code>public class MainActivity extends Activity { EditText item; Button insert; RelativeLayout layout; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); item = (EditText) findViewById(R.id.item); layout = (RelativeLayout) findViewById(R.id.layout); } @Override public void onResume() { super.onResume(); insert.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { String s_item = item.getText().toString(); TextView tv = new TextView(MainActivity.this); layout.addView(tv); tv.setText(s_item); } }); } } </code></pre> <p>when the app starts, it just crashes... and the problem is in this code apparently...</p> <p>LOGCAT</p> <pre><code>08-18 14:37:19.425 2981-2981/? E/AndroidRuntime: FATAL EXCEPTION: main java.lang.RuntimeException: Unable to resume activity {g.d.raven/g.d.raven.MainActivity}: java.lang.NullPointerException at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2124) at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2139) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1672) at android.app.ActivityThread.access$1500(ActivityThread.java:117) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:935) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:130) at android.app.ActivityThread.main(ActivityThread.java:3687) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:507) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:842) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600) at dalvik.system.NativeStart.main(Native Method) Caused by: java.lang.NullPointerException at g.d.raven.MainActivity.onResume(MainActivity.java:30) at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1150) at android.app.Activity.performResume(Activity.java:3832) at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2114) ... 12 more 08-18 14:37:19.429 130-143/? E/: Dumpstate &gt; /data/log/dumpstate_app_error </code></pre> <p>Thank you all, i found it by myself just now, forgot to instantiate the button XD</p>
 

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