我正在制作照片编辑应用程序，当我在MainActivity中发生单一崩溃时，我使用导航抽屉（BaseActivity）附加的MainActivity，然后app变得永远不会关闭。 3分钟之后，在Playstore中发布此崩溃报告。
java.lang.NullPointerException
at com.photex.urdu.textonphotos.Main_Activity$19.onCancel(Main_Activity.java:1638)
at android.app.Dialog$ListenersHandler.handleMessage(Dialog.java:1292)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5291)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:849)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:665)
at dalvik.system.NativeStart.main(Native Method)
Baseactivity.java
public class BaseActivity extends Activity {
protected FrameLayout frameLayout;
protected ListView mDrawerList;
// protected String[] listArray = { "Profile", "Home", "My Work", "Help",
// "Invite Friends", "About", "Rate Us", "More App", "Updates", "Exit" };
protected ArrayList<Items> _items;
protected static int position;
private static boolean isLaunch = true;
// Random ran;
protected static int isQuits = 1;
protected DrawerLayout mDrawerLayout;
// for drawer open, close etc.
private ActionBarDrawerToggle actionBarDrawerToggle;
// private int mRanInt;
// int img[] = new int[] { R.drawable.profile, R.drawable.profile2 };
// private Animation animSlideUp;
@SuppressLint({ "NewApi", "InflateParams" })
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.nav_drawer_base);
frameLayout = (FrameLayout) findViewById(R.id.content_frame);
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerList = (ListView) findViewById(R.id.left_drawer);
mDrawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED);
// mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow,
// GravityCompat.START);
_items = new ArrayList<Items>();
_items.add(new Items("Restart", "Clear All Content",
R.drawable.nvg_restart));
_items.add(new Items("My Photex Work", "Your Post or Your Work",
R.drawable.nvg_work));
_items.add(new Items("Invite Friends", "Share app to your friends",
R.drawable.nvg_invite));
_items.add(new Items("Updates", "Check for new updates",
R.drawable.nvg_updt));
_items.add(new Items("About", "know about App", R.drawable.nvg_about));
_items.add(new Items("Help", "How to Use Photex app",
R.drawable.nvg_help));
_items.add(new Items("Exit", "Exit Photex", R.drawable.nvg_exit));
// Adding header on list view
View header = (View) getLayoutInflater().inflate(
R.layout.listview_header, null);
mDrawerList.addHeaderView(header);
mDrawerList.setAdapter(new NavigationDrawerListAdapter(this, _items));
mDrawerList.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
openActivity(position, 1);
}
});
// enable ActionBar app icon to behave as action to toggle nav drawer
getActionBar().setDisplayHomeAsUpEnabled(true);
getActionBar().setHomeButtonEnabled(true);
// ActionBarDrawerToggle ties together the the proper interactions
// between the sliding drawer and the action bar app icon
actionBarDrawerToggle = new ActionBarDrawerToggle(this, /* host Activity */
mDrawerLayout, /* DrawerLayout object */
R.drawable.ic_drawer, /* nav drawer image to replace 'Up' caret */
R.string.app_name, /* "open drawer" description for accessibility */
R.string.app_name) /* "close drawer" description for accessibility */
{
@Override
public void onDrawerClosed(View drawerView) {
getActionBar().setTitle(/* listArray[position] */"Photex");
invalidateOptionsMenu(); // creates call to
// onPrepareOptionsMenu()
super.onDrawerClosed(drawerView);
}
@Override
public void onDrawerOpened(View drawerView) {
getActionBar().setTitle(getString(R.string.app_name));
invalidateOptionsMenu();
super.onDrawerOpened(drawerView);
}
@Override
public void onDrawerSlide(View drawerView, float slideOffset) {
super.onDrawerSlide(drawerView, slideOffset);
}
@Override
public void onDrawerStateChanged(int newState) {
super.onDrawerStateChanged(newState);
}
};
mDrawerLayout.setDrawerListener(actionBarDrawerToggle);
if (isLaunch) {
isLaunch = false;
openActivity(0, 0);
}
}
@Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
// Sync the toggle state after onRestoreInstanceState has occurred.
actionBarDrawerToggle.syncState();
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
actionBarDrawerToggle.onConfigurationChanged(newConfig);
}
protected void openActivity(int position, int flag) {
// mDrawerList.setItemChecked(position, true);
// setTitle(listArray[position]);
mDrawerLayout.closeDrawer(mDrawerList);
BaseActivity.position = position;
switch (position) {
case 0:
if (flag == 0) {
callnow();
} else {
Uri uri = Uri.parse("market://details?id=com......");
Intent goToMarket = new Intent(Intent.ACTION_VIEW, uri);
try {
startActivity(goToMarket);
} catch (ActivityNotFoundException e) {
}
}
break;
case 1:
finish();
Intent in = new Intent(this, Main_Activity.class);
in.setFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION);
startActivity(in);
break;
case 2:
Intent mi = new Intent(this, GridViewActivity.class);
mi.setFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION);
startActivity(mi);
break;
case 3:
Intent sendIntent = new Intent();
sendIntent.setAction(Intent.ACTION_SEND);
sendIntent
.putExtra(
Intent.EXTRA_TEXT,
"Hey I am using photex cool app for making posts.\nDownload now\nhttps://play.google.com/store/apps/details?id="
+ getPackageName());
sendIntent.setType("text/plain");
startActivity(sendIntent);
break;
case 4:
Uri uri = Uri.parse("market://details?id=" + getPackageName());
Intent goToMarket = new Intent(Intent.ACTION_VIEW, uri);
try {
startActivity(goToMarket);
} catch (ActivityNotFoundException e) {
startActivity(new Intent(
Intent.ACTION_VIEW,
Uri.parse("http://play.google.com/store/apps/details?id="
+ getPackageName())));
}
break;
case 5:
Intent about = new Intent(this, About.class);
about.setFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION);
startActivity(about);
break;
case 6:
Intent idi = new Intent(this, HelpTabHost.class);
idi.setFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION);
startActivity(idi);
break;
case 7:
try {
Main_Activity.getInstance().onexit();
Main_Activity.Exit();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
break;
default:
break;
}
}
private void callnow() {
startActivity(new Intent(this, Main_Activity.class));
}
@Override
protected void onResume() {
if (BaseActivity.isQuits == 1) {
isLaunch = true;
BaseActivity.isQuits = 0;
// Main_Activity.Exit();
finish();
}
super.onResume();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.mainx, menu);
return super.onCreateOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if (actionBarDrawerToggle.onOptionsItemSelected(item)) {
return true;
}
switch (item.getItemId()) {
case R.id.action_settings:
return true;
default:
return super.onOptionsItemSelected(item);
}
}
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
// boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList);
// menu.findItem(R.id.action_settings).setVisible(!drawerOpen);
return super.onPrepareOptionsMenu(menu);
}
@Override
public void onBackPressed() {
if (mDrawerLayout.isDrawerOpen(mDrawerList)) {
mDrawerLayout.closeDrawer(mDrawerList);
} else {
// mRanInt = ran.nextInt(1);
mDrawerLayout.openDrawer(mDrawerList);
}
}
}
MainActivity.java
public void onexit() {
final Dialog dialog = new Dialog(Main_Activity.this);
// dialog.requestWindowFeature(Window.FEATURE_LEFT_ICON);
dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
// String APP_TITLE = getString(R.string.app_name);
// dialog.setTitle(APP_TITLE);
dialog.setCancelable(true);
LinearLayout ll = new LinearLayout(this);
ll.setOrientation(LinearLayout.VERTICAL);
ScrollView sv = new ScrollView(this);
sv.setBackgroundColor(Color.TRANSPARENT);
ImageView iv = new ImageView(this);
Random rand = new Random();
final int i = rand.nextInt(apps.length);
iv.setImageResource(apps[i]);
iv.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if (i == 0) {
Uri uri = Uri.parse("market://details?id=com.");
Intent goToMarket = new Intent(Intent.ACTION_VIEW, uri);
try {
startActivity(goToMarket);
} catch (ActivityNotFoundException e) {
Toast.makeText(Main_Activity.this,
"Couldn't launch the market",
Toast.LENGTH_SHORT).show();
}
} else if (i == 1) {
Util.openFacebook(Main_Activity.this);
}
}
});
ll.addView(iv);
Button b1 = new Button(this);
b1.setText("Yes");
b1.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
dialog.dismiss();
removeViews();
BaseActivity.isQuits = 1;
}
});
// ll.addView(b1);
LinearLayout HLL = new LinearLayout(this);
HLL.setOrientation(LinearLayout.HORIZONTAL);
Button b2 = new Button(this);
b2.setText("Rate us!");
b2.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
try {
Intent mintent = new Intent(Intent.ACTION_VIEW);
mintent.setData(Uri.parse("market://details?id="
+ getPackageName()));
startActivity(mintent);
} catch (Exception e1) {
try {
Uri uriUrl = Uri
.parse("https://market.android.com/details?id="
+ getPackageName());
Intent launchBrowser = new Intent(Intent.ACTION_VIEW,
uriUrl);
startActivity(launchBrowser);
} catch (Exception e2) {
Toast.makeText(Main_Activity.this,
"No Application Found to open link",
Toast.LENGTH_SHORT).show();
}
}
dialog.dismiss();
}
});
@SuppressWarnings("deprecation")
LinearLayout.LayoutParams p = new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.FILL_PARENT,
LinearLayout.LayoutParams.WRAP_CONTENT);
p.weight = 1;
b2.setLayoutParams(p);
HLL.addView(b2);
Button b3 = new Button(this);
b3.setText("Yes");
b3.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
dialog.dismiss();
removeViews();
BaseActivity.isQuits = 1;
}
});
b3.setLayoutParams(p);
HLL.addView(b3);
ll.addView(HLL);
sv.addView(ll);
dialog.setContentView(sv);
// setFeatureDrawableResource(Window.FEATURE_LEFT_ICON,
// R.drawable.ic_launcher);
dialog.show();
}
@Override
protected void onResume() {
if (BaseActivity.isQuits == 1) {
removeViews();
}
super.onResume();
}