我想要一些帮助我对android变得疯狂。在这里你有mi代码和logcat掉线，我希望你能给我指路。
为了更好地理解，我正在寻找的是;在活动“concejos”中，有滑动标签，每个标签都是一个像片段一样的布局，在这些布局中有按钮，它们会打开一个带有图像，文本和关闭按钮的对话框片段。
CODE
public class Concejos extends FragmentActivity implements ActionBar.TabListener {
AppSectionsPagerAdapter mAppSectionsPagerAdapter;
ViewPager mViewPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_concejos);
mAppSectionsPagerAdapter = new AppSectionsPagerAdapter(getSupportFragmentManager());
final ActionBar actionBar = getActionBar();
actionBar.setHomeButtonEnabled(false);
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mAppSectionsPagerAdapter);
mViewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
@Override
public void onPageSelected(int position) {
// When swiping between different app sections, select the corresponding tab.
// We can also use ActionBar.Tab#select() to do this if we have a reference to the
// Tab.
actionBar.setSelectedNavigationItem(position);
}
});
// For each of the sections in the app, add a tab to the action bar.
for (int i = 0; i < mAppSectionsPagerAdapter.getCount(); i++) {
actionBar.addTab(
actionBar.newTab()
.setText(mAppSectionsPagerAdapter.getPageTitle(i))
.setTabListener(this));
}
}
@Override
public void onTabReselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
}
@Override
public void onTabSelected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
mViewPager.setCurrentItem(tab.getPosition());
}
@Override
public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
}
public static class AppSectionsPagerAdapter extends FragmentPagerAdapter {
public AppSectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
switch (position) {
case 0:
return new SectionFragmentCocina();
case 1:
return new SectionFragmentComedor();
case 2:
return new SectionFragmentCuartoLavado();
case 3:
return new SectionFragmentBano();
default:
return new SectionFragmentCocina();
}
}
@Override
public int getCount() {
return 4;
}
@Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0:
return "Cocina";
case 1:
return "Comedor";
case 2:
return "Cuarto de lavado";
case 3:
return "Baño";
}
return null;
}
}
public static class SectionFragmentCocina extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_cocina, container, false);
// Demonstration of a collection-browsing activity.
rootView.findViewById(R.id.btnLavavajilla).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Context context = null;
/*Intent intent = new Intent(getActivity(), SectionFragment1.class);
startActivity(intent);*/
final Dialog dialog = new Dialog(context);
dialog.setContentView(R.layout.fragment_dialog);
dialog.setTitle("Title...");
// set the custom dialog components - text, image and button
TextView text = (TextView) dialog.findViewById(R.id.txtTexto);
text.setText("Android custom dialog example!");
ImageView image = (ImageView) dialog.findViewById(R.id.ivImagen);
image.setImageResource(R.drawable.ic_launcher);
Button dialogButton = (Button) dialog.findViewById(R.id.dialogButtonOK);
// if button is clicked, close the custom dialog
dialogButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
dialog.dismiss();
}
});
dialog.show();
}
});
return rootView;
}
}
public static class SectionFragmentComedor extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_comedor, container, false);
// Demonstration of a collection-browsing activity.
/*rootView.findViewById(R.id.btnLavavajilla).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(getActivity(), SectionFragment2.class);
startActivity(intent);
}
});*/
return rootView;
}
}
public static class SectionFragmentCuartoLavado extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_cuarto_lavado, container, false);
// Demonstration of a collection-browsing activity.
/*rootView.findViewById(R.id.btnLavavajilla).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(getActivity(), SectionFragment3.class);
startActivity(intent);
}
});*/
return rootView;
}
}
public static class SectionFragmentBano extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_bano, container, false);
// Demonstration of a collection-browsing activity.
/*rootView.findViewById(R.id.btnLavavajilla).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(getActivity(), SectionFragment4.class);
startActivity(intent);
}
});*/
return rootView;
}
}
}
logcat的
06-04 10:05:59.111: D/dalvikvm(560): GC_FOR_ALLOC freed 99K, 3% free 6972K/7171K, paused 133ms
06-04 10:05:59.151: I/dalvikvm-heap(560): Grow heap (frag case) to 8.370MB for 1536016-byte allocation
06-04 10:05:59.331: D/dalvikvm(560): GC_CONCURRENT freed 1K, 3% free 8471K/8711K, paused 9ms+35ms
06-04 10:06:00.581: D/gralloc_goldfish(560): Emulator without GPU emulation detected.
06-04 10:06:00.781: W/TextLayoutCache(560): computeValuesWithHarfbuzz -- need to force to single run
06-04 10:07:37.460: D/dalvikvm(560): GC_CONCURRENT freed 20K, 2% free 8923K/9095K, paused 10ms+53ms
06-04 10:07:42.911: D/dalvikvm(560): GC_FOR_ALLOC freed 99K, 3% free 8965K/9223K, paused 72ms
06-04 10:07:42.962: I/dalvikvm-heap(560): Grow heap (frag case) to 10.071MB for 1280016-byte allocation
06-04 10:07:43.261: D/dalvikvm(560): GC_CONCURRENT freed 9K, 3% free 10205K/10503K, paused 45ms+8ms
06-04 10:07:43.912: D/dalvikvm(560): GC_FOR_ALLOC freed 4K, 3% free 10377K/10631K, paused 93ms
06-04 10:07:43.941: I/dalvikvm-heap(560): Grow heap (frag case) to 11.451MB for 1280016-byte allocation
06-04 10:07:44.183: D/dalvikvm(560): GC_CONCURRENT freed <1K, 3% free 11626K/11911K, paused 8ms+9ms
06-04 10:07:45.182: W/TextLayoutCache(560): computeValuesWithHarfbuzz -- need to force to single run
06-04 10:07:48.961: D/AndroidRuntime(560): Shutting down VM
06-04 10:07:48.961: W/dalvikvm(560): threadid=1: thread exiting with uncaught exception (group=0x409961f8)
06-04 10:07:49.001: E/AndroidRuntime(560): FATAL EXCEPTION: main
06-04 10:07:49.001: E/AndroidRuntime(560): java.lang.NullPointerException
06-04 10:07:49.001: E/AndroidRuntime(560): at android.app.Dialog.<init>(Dialog.java:149)
06-04 10:07:49.001: E/AndroidRuntime(560): at android.app.Dialog.<init>(Dialog.java:127)
06-04 10:07:49.001: E/AndroidRuntime(560): at com.astrixapp.Concejos$SectionFragmentCocina$1.onClick(Concejos.java:123)
06-04 10:07:49.001: E/AndroidRuntime(560): at android.view.View.performClick(View.java:3480)
06-04 10:07:49.001: E/AndroidRuntime(560): at android.view.View$PerformClick.run(View.java:13983)
06-04 10:07:49.001: E/AndroidRuntime(560): at android.os.Handler.handleCallback(Handler.java:605)
06-04 10:07:49.001: E/AndroidRuntime(560): at android.os.Handler.dispatchMessage(Handler.java:92)
06-04 10:07:49.001: E/AndroidRuntime(560): at android.os.Looper.loop(Looper.java:137)
06-04 10:07:49.001: E/AndroidRuntime(560): at android.app.ActivityThread.main(ActivityThread.java:4340)
06-04 10:07:49.001: E/AndroidRuntime(560): at java.lang.reflect.Method.invokeNative(Native Method)
06-04 10:07:49.001: E/AndroidRuntime(560): at java.lang.reflect.Method.invoke(Method.java:511)
06-04 10:07:49.001: E/AndroidRuntime(560): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
06-04 10:07:49.001: E/AndroidRuntime(560): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
06-04 10:07:49.001: E/AndroidRuntime(560): at dalvik.system.NativeStart.main(Native Method)
06-04 10:07:53.230: I/Process(560): Sending signal. PID: 560 SIG: 9
答案 0 :(得分：1)
您似乎将上下文变量设置为null，然后使用该变量创建AlertDialog。所以，它给你一个NullPointerException。而不是做：
Context context = null;
尝试这样做：
Context context = SectionFragmentCocina.this.getActivity();