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POAndroid viewpager activity problems
 

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  1. POAndroid viewpager activity problems
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    <p>I've been working on an Android activity which contains a ViewPager with 10 images on it and an Image View below which will display the image of the ViewPager upon click.</p> <p>When I try to run it after entering through my login screen, the deal crashes.</p> <p>I'm not sure where are the errors LogCat warns about so if you could help me out I'd be very grateful.</p> <p>Here are the LogCat messages:</p> <pre><code>FATAL EXCEPTION: main java.lang.NullPointerException at com.example.logger.SecondActivity$MyPagerAdapter.setPrimaryItem (SecondActivity.java:80) at android.support.v4.view.ViewPager.populate (ViewPager.java:1066) at android.support.v4.view.ViewPager.populate (ViewPager.java:914) at android.support.v4.view.ViewPager.onMeasure (ViewPager.java:1436) at android.view.View.measure (View.java:15848) at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:728) at android.widget.RelativeLayout.onMeasure (RelativeLayout.java:477) at android.view.View.measure (View.java:15848) at android.view.ViewGroup.measureChildWithMargins (ViewGroup.java:5012) at com.android.internal.widget.ActionBarOverLayout.onMeasure(ActionBarOverLayout.java:302) at android.view.View.measure (View.java:15848) at android.view.ViewGroup.measureChildWithMargins (ViewGroup.java:5012) at android.widget.FrameLayout.onMeasure (FrameLayout.java:310) at android.view.View.measure (View.java:15848) </code></pre> <p><strong>SecondActivity.java</strong></p> <pre><code>package com.example.logger; import android.os.Bundle; import android.annotation.SuppressLint; import android.app.Activity; import android.app.Fragment; import android.app.FragmentManager; import android.content.DialogInterface; import android.content.DialogInterface.OnClickListener; import android.support.v4.app.FragmentStatePagerAdapter; import android.support.v4.view.PagerAdapter; import android.support.v4.view.ViewPager; import android.view.LayoutInflater; import android.view.Menu; import android.view.View; import android.widget.ImageView; import android.view.ViewGroup; public class SecondActivity extends Activity { private static final int NUM_PAGES = 10; private ViewPager mpager; private MyPagerAdapter mPagerAdapter; private int [] pics = {R.drawable.android_interfaz_layout_estructura_final, R.drawable.baixa, R.drawable.baixada, R.drawable.greenprogressbar, R.drawable.layout_keyboard, R.drawable.linerlay, R.drawable.merge1, R.drawable.o2zds, R.drawable.regbd, R.drawable.s7qrs}; @SuppressLint("NewApi") @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_second); mPagerAdapter = new MyPagerAdapter(null); mpager = (ViewPager) findViewById(R.id.viewer); mpager.setAdapter (mPagerAdapter); } public void showImage (int position, View view) { //View is your view that you returned from instantiateItem //and position is it's position in array you can get the image resource id //using this position and set it to the ImageView } private class MyPagerAdapter extends PagerAdapter { SecondActivity activity; public MyPagerAdapter (SecondActivity activity){ this.activity=activity; } @Override public int getCount() { // TODO Auto-generated method stub return pics.length; } @Override public boolean isViewFromObject(View arg0, Object arg1) { // TODO Auto-generated method stub return false; } @Override public Object instantiateItem(View collection, int position) { ImageView view = new ImageView (SecondActivity.this); view.setImageResource (pics[position]); ((ViewPager) collection).addView(view, 0); return view; } @Override public void setPrimaryItem (ViewGroup container, int position, Object object) { super.setPrimaryItem (container, position, object); activity.showImage(position,(View)object); } } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.second, menu); return true; } private OnClickListener mPageClickListener = new OnClickListener() { public void onClick (View v) { // TODO Auto-generated method stub //aquí anirà la funció per traslladar la image de la gallery a la pantalla Integer picId = (Integer) v.getTag(); mpager.setVisibility(View.VISIBLE); mpager.setCurrentItem(v.getId()); } @Override public void onClick(DialogInterface dialog, int which) { // TODO Auto-generated method stub } }; } </code></pre> <p><strong>End SecondActivity.java</strong></p> <p><strong>Activity_Second.xml</strong></p> <pre><code>&lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 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" tools:context=".SecondActivity" &gt; &lt;android.support.v4.view.ViewPager android:padding="16dp" android:id="@+id/viewer" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="10dp" android:layout_weight="0.30" /&gt; &lt;ImageView android:id="@+id/big_image" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="10dp" android:layout_below="@+id/viewer" android:layout_weight="0.70" /&gt; &lt;/RelativeLayout&gt; </code></pre> <p><strong>End Activity_Second.xml</strong></p> <p>Just in case I'll add the MainActivity as well.</p> <p><strong>Main_Activity.java</strong></p> <pre><code>package com.example.logger; import android.os.Bundle; import android.app.Activity; import android.content.Intent; import android.view.Menu; import android.view.View; import android.view.View.OnClickListener; public class MainActivity extends Activity implements OnClickListener { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); attachHandlers(); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } private void attachHandlers() { findViewById(R.id.login).setOnClickListener(this); } @Override public void onClick(View arg0) { if(arg0.getId() == R.id.login) { Intent i = new Intent(this, SecondActivity.class); startActivity(i); } } } </code></pre> <p><strong>End MainActivity.java</strong></p> <p><strong>Activity_Main.xml</strong></p> <pre><code>&lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 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" android:orientation="vertical" tools:context=".MainActivity" &gt; &lt;Button android:id="@+id/login" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="@string/Login" android:layout_alignParentBottom="true" android:background="@drawable/shapes" android:textColor="@color/text" /&gt; &lt;EditText android:id="@+id/username" android:layout_width="match_parent" android:layout_height="wrap_content" android:hint="@string/input_u" android:layout_marginTop="10dp" android:textColor="@color/text" /&gt; &lt;EditText android:id="@+id/password" android:layout_below="@+id/username" android:layout_width="match_parent" android:layout_height="wrap_content" android:hint="@string/input_p" android:layout_marginTop="10dp" android:textColor="@color/text" /&gt; &lt;/RelativeLayout&gt; </code></pre> <p><strong>End Activity_Main.xml</strong></p> <p>I'd be very grateful if I could receive some insight into how to fix these problems.</p> <p>Yours sincerely,</p> <p>Mauro.</p>
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