coidsdruddy
New Member
Despite the content of the comment of @stealthcopter (check answer made by @Andrew) in this question How to add a button to PreferenceScreen, I am not able to visualise a button in the bottom part of my activity.The application .apk will crash with the following error: \[code\]Unfortunately your_app has stopped working!\[/code\]Here is the stack trace from the crash:\[code\]05-25 21:26:39.431: I/dalvikvm(1405): threadid=3: reacting to signal 305-25 21:26:39.462: I/dalvikvm(1405): Wrote stack traces to '/data/anr/traces.txt'05-25 21:26:44.851: I/Process(1405): Sending signal. PID: 1405 SIG: 905-25 21:40:51.442: I/dalvikvm(1936): threadid=3: reacting to signal 305-25 21:40:51.601: I/dalvikvm(1936): Wrote stack traces to '/data/anr/traces.txt'05-25 21:40:51.951: I/dalvikvm(1936): threadid=3: reacting to signal 305-25 21:40:52.001: I/dalvikvm(1936): Wrote stack traces to '/data/anr/traces.txt'05-25 21:40:52.472: I/dalvikvm(1936): threadid=3: reacting to signal 305-25 21:40:52.561: I/dalvikvm(1936): Wrote stack traces to '/data/anr/traces.txt'05-25 21:40:52.631: D/dalvikvm(1936): GC_CONCURRENT freed 172K, 4% free 9313K/9607K, paused 7ms+7ms05-25 21:40:52.691: D/gralloc_goldfish(1936): Emulator without GPU emulation detected.05-25 21:40:54.372: D/AndroidRuntime(1936): Shutting down VM05-25 21:40:54.372: W/dalvikvm(1936): threadid=1: thread exiting with uncaught exception (group=0x409c01f8)05-25 21:40:54.422: E/AndroidRuntime(1936): FATAL EXCEPTION: main05-25 21:40:54.422: E/AndroidRuntime(1936): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.DVA_HLUI/com.DVA_HLUI.DVA_HLUIPrefsActivity}: java.lang.RuntimeException: Your content must have a ListView whose id attribute is 'android.R.id.list'05-25 21:40:54.422: E/AndroidRuntime(1936): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)05-25 21:40:54.422: E/AndroidRuntime(1936): at android.app.ActivityThread.startActivityNow(ActivityThread.java:1797)05-25 21:40:54.422: E/AndroidRuntime(1936): at android.app.LocalActivityManager.moveToState(LocalActivityManager.java:135)05-25 21:40:54.422: E/AndroidRuntime(1936): at android.app.LocalActivityManager.startActivity(LocalActivityManager.java:347)05-25 21:40:54.422: E/AndroidRuntime(1936): at android.widget.TabHost$IntentContentStrategy.getContentView(TabHost.java:682)05-25 21:40:54.422: E/AndroidRuntime(1936): at android.widget.TabHost.setCurrentTab(TabHost.java:346)05-25 21:40:54.422: E/AndroidRuntime(1936): at android.widget.TabHost$2.onTabSelectionChanged(TabHost.java:150)05-25 21:40:54.422: E/AndroidRuntime(1936): at android.widget.TabWidget$TabClickListener.onClick(TabWidget.java:540)05-25 21:40:54.422: E/AndroidRuntime(1936): at android.view.View.performClick(View.java:3511)05-25 21:40:54.422: E/AndroidRuntime(1936): at android.view.View$PerformClick.run(View.java:14105)05-25 21:40:54.422: E/AndroidRuntime(1936): at android.os.Handler.handleCallback(Handler.java:605)05-25 21:40:54.422: E/AndroidRuntime(1936): at android.os.Handler.dispatchMessage(Handler.java:92)05-25 21:40:54.422: E/AndroidRuntime(1936): at android.os.Looper.loop(Looper.java:137)05-25 21:40:54.422: E/AndroidRuntime(1936): at android.app.ActivityThread.main(ActivityThread.java:4424)05-25 21:40:54.422: E/AndroidRuntime(1936): at java.lang.reflect.Method.invokeNative(Native Method)05-25 21:40:54.422: E/AndroidRuntime(1936): at java.lang.reflect.Method.invoke(Method.java:511)05-25 21:40:54.422: E/AndroidRuntime(1936): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)05-25 21:40:54.422: E/AndroidRuntime(1936): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)05-25 21:40:54.422: E/AndroidRuntime(1936): at dalvik.system.NativeStart.main(Native Method)05-25 21:40:54.422: E/AndroidRuntime(1936): Caused by: java.lang.RuntimeException: Your content must have a ListView whose id attribute is 'android.R.id.list'05-25 21:40:54.422: E/AndroidRuntime(1936): at android.app.ListActivity.onContentChanged(ListActivity.java:243)05-25 21:40:54.422: E/AndroidRuntime(1936): at android.preference.PreferenceActivity.onContentChanged(PreferenceActivity.java:944)05-25 21:40:54.422: E/AndroidRuntime(1936): at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:254)05-25 21:40:54.422: E/AndroidRuntime(1936): at android.app.Activity.setContentView(Activity.java:1835)05-25 21:40:54.422: E/AndroidRuntime(1936): at com.DVA_HLUI.DVA_HLUIPrefsActivity.onCreate(DVA_HLUIPrefsActivity.java:15)05-25 21:40:54.422: E/AndroidRuntime(1936): at android.app.Activity.performCreate(Activity.java:4465)05-25 21:40:54.422: E/AndroidRuntime(1936): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)05-25 21:40:54.422: E/AndroidRuntime(1936): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)05-25 21:40:54.422: E/AndroidRuntime(1936): ... 18 more\[/code\]Here is the activity java class that crashes:\[code\]public class DVA_HLUIPrefsActivity extends PreferenceActivity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); addPreferencesFromResource(R.xml.prefs); setContentView(R.layout.preferences); }}\[/code\]Here is its layout file:\[code\]<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android
rientation="vertical"> <ListView android:id="@+id/list" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_weight="1"> </ListView> <LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content"> <Button android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Quit!" android:layout_weight="0.5"android:layout_gravity="center_vertical" /> <Button android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Help" android:layout_weight="0.5" android:layout_gravity="center_vertical" /> </LinearLayout></LinearLayout>\[/code\]and finally this is the preferences xml resource:\[code\]<?xml version="1.0" encoding="utf-8"?><PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android" > <Preference android:key="about" android:title="@string/titleAbout" android:summary="@string/summaryAbout" /></PreferenceScreen>\[/code\]Can you please explain me what is the conflict that causes the application to crash?
rientation="vertical"> <ListView android:id="@+id/list" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_weight="1"> </ListView> <LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content"> <Button android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Quit!" android:layout_weight="0.5"android:layout_gravity="center_vertical" /> <Button android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Help" android:layout_weight="0.5" android:layout_gravity="center_vertical" /> </LinearLayout></LinearLayout>\[/code\]and finally this is the preferences xml resource:\[code\]<?xml version="1.0" encoding="utf-8"?><PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android" > <Preference android:key="about" android:title="@string/titleAbout" android:summary="@string/summaryAbout" /></PreferenceScreen>\[/code\]Can you please explain me what is the conflict that causes the application to crash?