[英]Android application crashes after startup without any errors
我的Android应用程序有问题。 之前它运行良好,但启动后立即开始崩溃,没有任何错误,我不知道为什么。 我在类中注释了很多代码,只留下了一些对工作很重要的东西,但仍然是同样的问题。 我有一个mainActivity和2个片段。
当我创建片段时,它会自动创建文件夹布局并在其中放置Java类。 片段Java类(列表,集合):
public class List extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_list, container, false);
}
}
主要活动类别:
public class MainActivity extends AppCompatActivity {
/**
* The {@link android.support.v4.view.PagerAdapter} that will provide
* fragments for each of the sections. We use a
* {@link FragmentPagerAdapter} derivative, which will keep every
* loaded fragment in memory. If this becomes too memory intensive, it
* may be best to switch to a
* {@link android.support.v4.app.FragmentStatePagerAdapter}.
*/
private SectionsPagerAdapter mSectionsPagerAdapter;
/**
* The {@link ViewPager} that will host the section contents.
*/
private ViewPager mViewPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
// Create the adapter that will return a fragment for each of the three
// primary sections of the activity.
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) findViewById(R.id.container);
mViewPager.setAdapter(mSectionsPagerAdapter);
TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(mViewPager);
FloatingActionButton addButton = (FloatingActionButton) findViewById(R.id.add);
addButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
}
/**
* A {@link FragmentPagerAdapter} that returns a fragment corresponding to
* one of the sections/tabs/pages.
*/
public class SectionsPagerAdapter extends FragmentPagerAdapter {
SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
switch(position) {
case 0:
return new Set();
case 1:
return new List();
default:
return null;
}
}
@Override
public int getCount() {
// Show 3 total pages.
return 2;
}
@Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0:
return "ZADÁVÁNÍ";
case 1:
return "SEZNAM";
}
return null;
}
}
}
activity_main.xml(自动生成):
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/main_content"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context="cz.sudoman281.kubirovacikalkulacka.MainActivity">
<android.support.design.widget.AppBarLayout
android:id="@+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingTop="@dimen/appbar_padding_top"
android:theme="@style/AppTheme.AppBarOverlay">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:layout_scrollFlags="scroll|enterAlways"
app:popupTheme="@style/AppTheme.PopupOverlay">
</android.support.v7.widget.Toolbar>
<android.support.design.widget.TabLayout
android:id="@+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior" />
</android.support.design.widget.CoordinatorLayout>
片段.xml文件:
<FrameLayout 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"
tools:context=".layout.List">
<GridLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:text="List"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/textView6" />
<ListView
android:layout_width="match_parent"
android:layout_height="match_parent" />
</GridLayout>
</FrameLayout>
从您的日志输出中,我看到了这一行:
01-01 15:01:58.206 7457-7457 / cz.sudoman281.kubirovacikalkulacka W / System:ClassLoader引用的未知路径:/data/app/cz.sudoman281.kubirovacikalkulacka-1/lib/arm64
我想本机库有问题,请仔细检查Make或CMake buid文件,确保从Java类正确加载了本机库。
另一件事,如果您正在使用Android Nougat在设备/仿真器上运行应用程序,则可能需要检查本地库是否未按非NDK库链接,如下所述: https : //developer.android.com/about /versions/nougat/android-7.0-changes.html#ndk
在启动应用程序时,logcat筛选器并不总是显示日志。 集成库时,我遇到了类似的问题。 这就是我发现问题所在的地方。
在调试模式下启动应用程序,在onCreate
方法的第一行上设置一个断点,然后继续跳过(F8),直到崩溃为止。
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