i am new to android app developing i am following buckys tutorials currently i am on this part https://www.youtube.com/watch?v=MdOxtws4DsI&index=13&list=PL6gx4Cwl9DGBsvRxJJOzG4r4k_zLKrnxl i did everything as told but when i run the app i find this error here's my logcat
12-08 20:42:45.548 2465-2465/com.kimdevelopment.kimmmm I/art: Not late-enabling -Xcheck:jni (already on) 12-08 20:42:45.549 2465-2465/com.kimdevelopment.kimmmm I/art: Late-enabling JIT 12-08 20:42:45.552 2465-2465/com.kimdevelopment.kimmmm I/art: JIT created with code_cache_capacity=2MB compile_threshold=1000 12-08 20:42:45.630 2465-2465/com.kimdevelopment.kimmmm W/System: ClassLoader referenced unknown path: /data/app/com.kimdevelopment.kimmmm-1/lib/x86 12-08 20:42:45.696 2465-2465/com.kimdevelopment.kimmmm D/AndroidRuntime: Shutting down VM 12-08 20:42:45.696 2465-2465/com.kimdevelopment.kimmmm E/AndroidRuntime: FATAL EXCEPTION: main Process: com.kimdevelopment.kimmmm, PID: 2465 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.kimdevelopment.kimmmm/com.kimdevelopment.kimmmm.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.CharSequence android.support.v7.widget.Toolbar.getTitle()' on a null object reference at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476) at android.app.ActivityThread.-wrap11(ActivityThread.java) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:148) at android.app.ActivityThread.main(ActivityThread.java:5417) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.CharSequence android.support.v7.widget.Toolbar.getTitle()' on a null object reference at android.support.v7.widget.ToolbarWidgetWrapper.<init>(ToolbarWidgetWrapper.java:98) at android.support.v7.widget.ToolbarWidgetWrapper.<init>(ToolbarWidgetWrapper.java:91) at android.support.v7.app.ToolbarActionBar.<init>(ToolbarActionBar.java:73) at android.support.v7.app.AppCompatDelegateImplV7.setSupportActionBar(AppCompatDelegateImplV7.java:205) at android.support.v7.app.AppCompatActivity.setSupportActionBar(AppCompatActivity.java:99) at com.kimdevelopment.kimmmm.MainActivity.onCreate(MainActivity.java:27) at android.app.Activity.performCreate(Activity.java:6237) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476) at android.app.ActivityThread.-wrap11(ActivityThread.java) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:148) at android.app.ActivityThread.main(ActivityThread.java:5417) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) 12-08 20:42:54.014 2465-2465/? I/Process: Sending signal. PID: 2465 SIG: 9 also here's the java file that i edited
package com.kimdevelopment.kimmmm; import android.os.Bundle; import android.support.design.widget.FloatingActionButton; import android.support.design.widget.Snackbar; import android.support.v7.app.AppCompatActivity; import android.support.v7.widget.Toolbar; import android.view.View; import android.view.Menu; import android.view.MenuItem; import android.widget.RelativeLayout; import android.widget.Button; public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); RelativeLayout kimsLayout = new RelativeLayout(this); Button redButton = new Button(this); kimsLayout.addView(redButton); setContentView(kimsLayout); Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); setSupportActionBar(toolbar); FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab); fab.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG) .setAction("Action", null).show(); } }); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.menu_main, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); //noinspection SimplifiableIfStatement if (id == R.id.action_settings) { return true; } return super.onOptionsItemSelected(item); } } and finally the xml file
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" app:layout_behavior="@string/appbar_scrolling_view_behavior" tools:context="com.kimdevelopment.kimmmm.MainActivity" tools:showIn="@layout/activity_main"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Hello World!" /> </RelativeLayout>
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