它是Android Studio的错误日志，它会崩溃。
02-08 10:56:28.746 9956-9956/lifeline.learn.com.slidingfragments E/AndroidRuntime: FATAL EXCEPTION: main
Process: lifeline.learn.com.slidingfragments, PID: 9956
java.lang.RuntimeException: Unable to start activity ComponentInfo{lifeline.learn.com.slidingfragments/lifeline.learn.com.slidingfragments.Main2Activity}: android.view.InflateException: Binary XML file line #0: Binary XML file line #0: Error inflating class com.github.mikephil.charting.charts.PieChart
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2984)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3045)
at android.app.ActivityThread.-wrap14(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1642)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6776)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1518)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1408)
Caused by: android.view.InflateException: Binary XML file line #0: Binary XML file line #0: Error inflating class com.github.mikephil.charting.charts.PieChart
Caused by: android.view.InflateException: Binary XML file line #0: Error inflating class com.github.mikephil.charting.charts.PieChart
Caused by: java.lang.ClassNotFoundException: Didn't find class "com.github.mikephil.charting.charts.PieChart" on path: DexPathList[[zip file "/data/app/lifeline.learn.com.slidingfragments-1/base.apk", zip file "/data/app/lifeline.learn.com.slidingfragments-1/split_lib_dependencies_apk.apk", zip file "/data/app/lifeline.learn.com.slidingfragments-1/split_lib_slice_0_apk.apk", zip file "/data/app/lifeline.learn.com.slidingfragments-1/split_lib_slice_1_apk.apk", zip file "/data/app/lifeline.learn.com.slidingfragments-1/split_lib_slice_2_apk.apk", zip file "/data/app/lifeline.learn.com.slidingfragments-1/split_lib_slice_3_apk.apk", zip file "/data/app/lifeline.learn.com.slidingfragments-1/split_lib_slice_4_apk.apk", zip file "/data/app/lifeline.learn.com.slidingfragments-1/split_lib_slice_5_apk.apk", zip file "/data/app/lifeline.learn.com.slidingfragments-1/split_lib_slice_6_apk.apk", zip file "/data/app/lifeline.learn.com.slidingfragments-1/split_lib_slice_7_apk.apk", zip file "/data/app/lifeline.learn.com.slidingfragments-1/split_lib_slice_8_apk.apk", zip file "/data/app/lifeline.learn.com.slidingfragments-1/split_lib_slice_9_apk.apk"],nativeLibraryDirectories=[/data/app/lifeline.learn.com.slidingfragments-1/lib/arm, /system/lib, /vendor/lib]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
at java.lang.ClassLoader.loadClass(ClassLoader.java:380)
at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
at android.view.LayoutInflater.createView(LayoutInflater.java:616)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:794)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:734)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:865)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:828)
at android.view.LayoutInflater.inflate(LayoutInflater.java:525)
at android.view.LayoutInflater.inflate(LayoutInflater.java:427)
at android.view.LayoutInflater.inflate(LayoutInflater.java:378)
at android.support.v7.app.AppCompatDelegateImplV9.setContentView(AppCompatDelegateImplV9.java:287)
at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:139)
at lifeline.learn.com.slidingfragments.Main2Activity.onCreate(Main2Activity.java:23)
at android.app.Activity.performCreate(Activity.java:6956)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1126)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2927)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3045)
at android.app.ActivityThread.-wrap14(ActivityThread.java)
02-08 10:56:28.746 9956-9956/lifeline.learn.com.slidingfragments E/AndroidRuntime: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1642)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6776)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1518)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1408)
它的Tab 3我在片段中调用了开始活动：
public class Tab3 extends android.support.v4.app.Fragment {
Context context;
FirebaseDatabase firebaseDatabase = FirebaseDatabase.getInstance ();
DatabaseReference databaseReference = firebaseDatabase.getReference ();
private JazzyListView listView;
ArrayAdapter<String> listAdapter;
List<String> ListString = new ArrayList<> ();
View view;
@Override
public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
context = getContext ();
view = inflater.inflate (R.layout.fragment_tab3, container, false);
listView = (JazzyListView) view.findViewById (R.id.listview);
ListString.add ("Adding");
listAdapter = new ArrayAdapter<String> (context, android.R.layout.simple_list_item_1, ListString);
final Connectivity connectivity = new Connectivity (context);
if(connectivity.isConnected ()){
databaseReference.addValueEventListener (new ValueEventListener () {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
ListString.remove ("Adding");
DataSnapshot snapshot = dataSnapshot.child ("User");
for(DataSnapshot s: snapshot.getChildren ())
{
if(s.getValue ().toString ().isEmpty ())
Toast.makeText (context, "Empty", Toast.LENGTH_SHORT).show ();
else{
ListString.add(s.getKey ().toString ());
}
}
listAdapter.notifyDataSetChanged ();
}
@Override
public void onCancelled(DatabaseError databaseError) {
Toast.makeText (context, databaseError.getMessage (), Toast.LENGTH_SHORT).show ();
}
});
listView.setAdapter (listAdapter);
listView.setOnItemClickListener (new AdapterView.OnItemClickListener () {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
String name = adapterView.getItemAtPosition (i).toString ();
Intent intent = new Intent (getActivity (), Main2Activity.class).putExtra("name", name);
try {
getActivity ().startActivity (intent);
}catch (Exception e){
Toast.makeText (context, e.getMessage (), Toast.LENGTH_SHORT).show ();
}
}
});
}
return view;
}
}
这是我想要调用的Main2Activity.java，但每当我调用它时都会崩溃。
public class Main2Activity extends AppCompatActivity {
int present =0,absent=0, late=0;
FirebaseDatabase firebaseDatabase = FirebaseDatabase.getInstance ();
DatabaseReference databaseReference = firebaseDatabase.getReference ();
@Override
protected void onCreate(final Bundle savedInstanceState) {
super.onCreate (savedInstanceState);
setContentView (R.layout.activity_main2);
String name = getIntent ().getStringExtra ("name");
//pieChart = (PieChart) findViewById (R.id.pie);
try {
//pieChart.setCenterText ("Children");
//pieChart.setCenterTextSize (10f);
databaseReference.addValueEventListener (new ValueEventListener () {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
DataSnapshot snapshot = dataSnapshot.child ("Attendence");
for(DataSnapshot snapshot1 : snapshot.getChildren ()){
DataSnapshot snapshot2 = snapshot.child (snapshot1.getKey ());
for(DataSnapshot name: snapshot2.getChildren ()){
if(name.getKey ().equals (name)){
Log.e ("Got children","");
}
}
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
}catch (Exception e){
Toast.makeText (this, e.getMessage (), Toast.LENGTH_SHORT).show ();
}
}
}
每当我点击listview应用程序的项目时都会崩溃。我甚至试过try和catch方法来检测问题。我该怎么做才能调用活动并从应用程序中删除此崩溃。因为我是Android开发的新手。帮助我摆脱这个问题
答案 0 :(得分：0)
您遇到此问题，因为Android无法找到您的外部库类com.github.mikephil.charting.charts.PieChart。
在您的错误日志中，清楚地提到了它。
Binary XML file line #0: Error inflating class com.github.mikephil.charting.charts.PieChart
答案 1 :(得分：-1)
例外是关于Multidex。
总之， Android可以支持64K方法。 但是你使用的是很多库。 因此总方法的数量大于64K。 例外意味着它。
要解决此问题，您应该使用Multidex。 这并不困难。 您只需编辑清单文件build.gradle文件。
您可以找到更多信息：https://developer.android.com/studio/build/multidex.html