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PO“Unfortunately your app has stopped” error in emulator at start of an animation
 

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  1. PO“Unfortunately your app has stopped” error in emulator at start of an animation
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    <p>I'm new to android programming. Here I have a footer with a back, quickmenu and ok button. By pressing the menu button I want another linearlayout to slide up. And when it is pressed again it will slide down.</p> <p>BaseActivity:</p> <pre><code>package com.app.getconnected.activities; import com.app.getconnected.R; import com.app.getconnected.animations.CollapseAnimation; import com.app.getconnected.animations.ExpandAnimation; import android.os.Bundle; import android.app.Activity; import android.content.Intent; import android.util.DisplayMetrics; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.LinearLayout; import android.widget.TextView; abstract class BaseActivity extends Activity { protected TextView txtHeading; protected Button buttonBack; private Button buttonMenu; protected Button buttonOk; protected Button buttonHome; private LinearLayout MenuList; private int screenHeight; private boolean isExpanded; protected static final String activityPackage = "com.app.getconnected.activities"; protected static Boolean loggedIn=false; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.footer); } protected void initLayout(int resId, boolean homeButton, boolean backButton, boolean menuButton, boolean okButton) { if (txtHeading == null) txtHeading = (TextView) findViewById(R.id.header_text); if (txtHeading != null) txtHeading.setText(resId); buttonHome = (Button) findViewById(R.id.header_button_home); buttonBack = (Button) findViewById(R.id.footer_button_back); buttonMenu = (Button) findViewById(R.id.footer_button_menu); buttonOk = (Button) findViewById(R.id.footer_button_ok); buttonBack.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { goBack(); } }); buttonMenu.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { handleMenu(); } }); buttonHome.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { Intent intent = new Intent(BaseActivity.this, MainActivity.class); startActivityForResult(intent, 1); finish(); } }); this.buttonHome.setVisibility(homeButton ? View.VISIBLE : View.INVISIBLE); this.buttonBack.setVisibility(backButton ? View.VISIBLE : View.INVISIBLE); this.buttonMenu.setVisibility(menuButton ? View.VISIBLE : View.INVISIBLE); this.buttonOk.setVisibility(okButton ? View.VISIBLE : View.INVISIBLE); } protected void goBack() { super.onBackPressed(); } private void handleMenu() { DisplayMetrics metrics = new DisplayMetrics(); getWindowManager().getDefaultDisplay().getMetrics(metrics); screenHeight = metrics.heightPixels; buttonMenu.setOnClickListener(new OnClickListener() { public void onClick(View v) { System.out.println("Quick Menu clicked"); if (isExpanded) { isExpanded = false; MenuList.startAnimation(new CollapseAnimation(MenuList, 0, (int)(screenHeight*0.7), 20)); }else { isExpanded = true; MenuList.startAnimation(new ExpandAnimation(MenuList, 0,(int)(screenHeight*0.7), 20)); } } }); } protected void disableBackButton() { } /** * * @param view */ public void startIntentByButton(View view) { Button button = (Button) view; if(!button.getTag().equals("")) { try { Intent intent = new Intent(getApplicationContext(), Class.forName(BaseActivity.activityPackage + "." + button.getTag().toString())); startActivityForResult(intent, 1); } catch (ClassNotFoundException e) { e.printStackTrace(); } } } } </code></pre> <p>Here are the two animation classes.</p> <p>Collapse:</p> <pre><code>package com.app.getconnected.animations; import android.view.View; import android.view.ViewGroup.LayoutParams; import android.view.animation.AccelerateInterpolator; import android.view.animation.Animation; public class CollapseAnimation extends Animation implements Animation.AnimationListener { private View view; private static int ANIMATION_DURATION; private int LastWidth; private int FromWidth; private int ToWidth; private static int STEP_SIZE=30; public CollapseAnimation(View v, int FromWidth, int ToWidth, int Duration) { this.view = v; LayoutParams lyp = view.getLayoutParams(); ANIMATION_DURATION = 1; this.FromWidth = lyp.height; this.ToWidth = lyp.height; setDuration(ANIMATION_DURATION); setRepeatCount(20); setFillAfter(false); setInterpolator(new AccelerateInterpolator()); setAnimationListener(this); } @Override public void onAnimationEnd(Animation animation) { // TODO Auto-generated method stub } @Override public void onAnimationRepeat(Animation animation) { // TODO Auto-generated method stub LayoutParams lyp = view.getLayoutParams(); lyp.height = lyp.height - ToWidth/20; view.setLayoutParams(lyp); } @Override public void onAnimationStart(Animation animation) { // TODO Auto-generated method stub LayoutParams lyp = view.getLayoutParams(); LastWidth = lyp.height; } } </code></pre> <p>Extend:</p> <pre><code>package com.app.getconnected.animations; import android.view.View; import android.view.ViewGroup.LayoutParams; import android.view.animation.AccelerateInterpolator; import android.view.animation.Animation; import android.widget.Toast; public class ExpandAnimation extends Animation implements Animation.AnimationListener { private View view; private static int ANIMATION_DURATION; private int LastWidth; private int FromWidth; private int ToWidth; private static int STEP_SIZE=30; public ExpandAnimation(View v, int FromWidth, int ToWidth, int Duration) { this.view = v; ANIMATION_DURATION = 1; this.FromWidth = FromWidth; this.ToWidth = ToWidth; setDuration(ANIMATION_DURATION); setRepeatCount(20); setFillAfter(false); setInterpolator(new AccelerateInterpolator()); setAnimationListener(this); } @Override public void onAnimationEnd(Animation animation) { // TODO Auto-generated method stub } @Override public void onAnimationRepeat(Animation animation) { // TODO Auto-generated method stub LayoutParams lyp = view.getLayoutParams(); lyp.height = LastWidth += ToWidth/20; view.setLayoutParams(lyp); } @Override public void onAnimationStart(Animation animation) { // TODO Auto-generated method stub LayoutParams lyp = view.getLayoutParams(); lyp.height = 0; view.setLayoutParams(lyp); LastWidth = 0; } } </code></pre> <p>Logcat:</p> <pre><code>10-24 09:08:52.210: D/dalvikvm(1095): GC_FOR_ALLOC freed 159K, 9% free 2860K/3120K, paused 41ms, total 59ms 10-24 09:08:52.350: D/gralloc_goldfish(1095): Emulator without GPU emulation detected. 10-24 09:08:56.489: D/dalvikvm(1095): GC_FOR_ALLOC freed 50K, 5% free 3321K/3472K, paused 51ms, total 68ms 10-24 09:09:14.550: I/System.out(1095): Quick Menu clicked 10-24 09:09:14.580: D/AndroidRuntime(1095): Shutting down VM 10-24 09:09:14.580: W/dalvikvm(1095): threadid=1: thread exiting with uncaught exception (group=0x414c4700) 10-24 09:09:14.680: E/AndroidRuntime(1095): FATAL EXCEPTION: main 10-24 09:09:14.680: E/AndroidRuntime(1095): java.lang.NullPointerException 10-24 09:09:14.680: E/AndroidRuntime(1095): at com.app.getconnected.activities.BaseActivity$4.onClick(BaseActivity.java:109) 10-24 09:09:14.680: E/AndroidRuntime(1095): at android.view.View.performClick(View.java:4240) 10-24 09:09:14.680: E/AndroidRuntime(1095): at android.view.View$PerformClick.run(View.java:17721) 10-24 09:09:14.680: E/AndroidRuntime(1095): at android.os.Handler.handleCallback(Handler.java:730) 10-24 09:09:14.680: E/AndroidRuntime(1095): at android.os.Handler.dispatchMessage(Handler.java:92) 10-24 09:09:14.680: E/AndroidRuntime(1095): at android.os.Looper.loop(Looper.java:137) 10-24 09:09:14.680: E/AndroidRuntime(1095): at android.app.ActivityThread.main(ActivityThread.java:5103) 10-24 09:09:14.680: E/AndroidRuntime(1095): at java.lang.reflect.Method.invokeNative(Native Method) 10-24 09:09:14.680: E/AndroidRuntime(1095): at java.lang.reflect.Method.invoke(Method.java:525) 10-24 09:09:14.680: E/AndroidRuntime(1095): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737) 10-24 09:09:14.680: E/AndroidRuntime(1095): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 10-24 09:09:14.680: E/AndroidRuntime(1095): at dalvik.system.NativeStart.main(Native Method) 10-24 09:11:49.983: I/Process(1095): Sending signal. PID: 1095 SIG: 9 10-24 09:11:52.441: D/gralloc_goldfish(1125): Emulator without GPU emulation detected. </code></pre> <p>Any help or advice is very welcome,</p> <p>Daniël</p>
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    1. USJuan Sánchez
    1. USDaninio
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    1. COWhat is at line 109 of `BaseActivity`?
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    2. COIs your menuList views null? Where is findViewbyId for this view?
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      1. USnurisezgin
    3. COYour `LinearLayout` `MenuList` has not been initiated. That is why the `NullPointerException` is thrown at line 109.
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