我正在编写新闻应用程序。该程序从导航抽屉活动开始，我通过xml api新闻对其进行了解析。 该程序在导航栏中仍然有2个片段。 启动应用程序后，它立即崩溃。 Studio不会突出显示代码中的错误……我寻求帮助！
我的MainActivity：
package com.example.developer.nasibovtestcityguide;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.support.design.widget.NavigationView;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
RecyclerView recyclerView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
ReadNews readNews = new ReadNews(this, recyclerView);
readNews.execute();
recyclerView =(RecyclerView)findViewById(R.id.recyclerview);
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.addDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
}
@Override
public void onBackPressed() {
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else {
super.onBackPressed();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
private void displaySelectedScreen (int id) {
Fragment fragment = null;
switch (id) {
case R.id.nav_settings:
fragment = new Settings();
break;
case R.id.nav_program:
fragment = new About_program();
break;
}
if (fragment != null) {
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
ft.replace(R.id.content_main, fragment);
ft.commit();
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
}
@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
displaySelectedScreen(id);
return true;
}
}
这是日志中的内容：
09-02 11:00:02.597 7291-7291/com.example.developer.nasibovtestcityguide E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.developer.nasibovtestcityguide, PID: 7291
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.developer.nasibovtestcityguide/com.example.developer.nasibovtestcityguide.MainActivity}: android.view.InflateException: Binary XML file line #11: Binary XML file line #2: Error inflating class android.support.constraint.RelativeLayout
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2817)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2892)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1593)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6541)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
Caused by: android.view.InflateException: Binary XML file line #11: Binary XML file line #2: Error inflating class android.support.constraint.RelativeLayout
Caused by: android.view.InflateException: Binary XML file line #2: Error inflating class android.support.constraint.RelativeLayout
Caused by: java.lang.ClassNotFoundException: Didn't find class "android.support.constraint.RelativeLayout" on path: DexPathList[[zip file "/data/app/com.example.developer.nasibovtestcityguide-kMSTA8DN78AzgfL4CUUTug==/base.apk", zip file "/data/app/com.example.developer.nasibovtestcityguide-kMSTA8DN78AzgfL4CUUTug==/split_lib_dependencies_apk.apk", zip file "/data/app/com.example.developer.nasibovtestcityguide-kMSTA8DN78AzgfL4CUUTug==/split_lib_resources_apk.apk", zip file "/data/app/com.example.developer.nasibovtestcityguide-kMSTA8DN78AzgfL4CUUTug==/split_lib_slice_0_apk.apk", zip file "/data/app/com.example.developer.nasibovtestcityguide-kMSTA8DN78AzgfL4CUUTug==/split_lib_slice_1_apk.apk", zip file "/data/app/com.example.developer.nasibovtestcityguide-kMSTA8DN78AzgfL4CUUTug==/split_lib_slice_2_apk.apk", zip file "/data/app/com.example.developer.nasibovtestcityguide-kMSTA8DN78AzgfL4CUUTug==/split_lib_slice_3_apk.apk", zip file "/data/app/com.example.developer.nasibovtestcityguide-kMSTA8DN78AzgfL4CUUTug==/split_lib_slice_4_apk.apk", zip file "/data/app/com.example.developer.nasibovtestcityguide-kMSTA8DN78AzgfL4CUUTug==/split_lib_slice_5_apk.apk", zip file "/data/app/com.example.developer.nasibovtestcityguide-kMSTA8DN78AzgfL4CUUTug==/split_lib_slice_6_apk.apk", zip file "/data/app/com.example.developer.nasibovtestcityguide-kMSTA8DN78AzgfL4CUUTug==/split_lib_slice_7_apk.apk", zip file "/data/app/com.example.developer.nasibovtestcityguide-kMSTA8DN78AzgfL4CUUTug==/split_lib_slice_8_apk.apk", zip file "/data/app/com.example.developer.nasibovtestcityguide-kMSTA8DN78AzgfL4CUUTug==/split_lib_slice_9_apk.apk"],nativeLibraryDirectories=[/data/app/com.example.developer.nasibovtestcityguide-kMSTA8DN78AzgfL4CUUTug==/lib/x86, /system/lib, /vendor/lib]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:93)
at java.lang.ClassLoader.loadClass(ClassLoader.java:379)
at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
at android.view.LayoutInflater.createView(LayoutInflater.java:606)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:790)
at android.view.LayoutInflater.parseInclude(LayoutInflater.java:965)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:859)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:824)
at android.view.LayoutInflater.parseInclude(LayoutInflater.java:995)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:859)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:824)
at android.view.LayoutInflater.inflate(LayoutInflater.java:515)
at android.view.LayoutInflater.inflate(LayoutInflater.java:423)
09-02 11:00:02.610 7291-7291/com.example.developer.nasibovtestcityguide E/AndroidRuntime: at android.view.LayoutInflater.inflate(LayoutInflater.java:374)
at android.support.v7.app.AppCompatDelegateImpl.setContentView(AppCompatDelegateImpl.java:469)
at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:140)
at com.example.developer.nasibovtestcityguide.MainActivity.onCreate(MainActivity.java:26)
at android.app.Activity.performCreate(Activity.java:6975)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1213)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2770)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2892)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1593)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6541)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
Suppressed: java.io.IOException: No original dex files found for dex location /data/app/com.example.developer.nasibovtestcityguide-kMSTA8DN78AzgfL4CUUTug==/split_lib_resources_apk.apk
at dalvik.system.DexFile.openDexFileNative(Native Method)
at dalvik.system.DexFile.openDexFile(DexFile.java:353)
at dalvik.system.DexFile.<init>(DexFile.java:100)
at dalvik.system.DexFile.<init>(DexFile.java:74)
at dalvik.system.DexPathList.loadDexFile(DexPathList.java:374)
at dalvik.system.DexPathList.makeDexElements(DexPathList.java:337)
at dalvik.system.DexPathList.<init>(DexPathList.java:157)
at dalvik.system.BaseDexClassLoader.<init>(BaseDexClassLoader.java:65)
at dalvik.system.PathClassLoader.<init>(PathClassLoader.java:64)
at com.android.internal.os.PathClassLoaderFactory.createClassLoader(PathClassLoaderFactory.java:43)
at android.app.ApplicationLoaders.getClassLoader(ApplicationLoaders.java:69)
at android.app.ApplicationLoaders.getClassLoader(ApplicationLoaders.java:36)
at android.app.LoadedApk.createOrUpdateClassLoaderLocked(LoadedApk.java:676)
at android.app.LoadedApk.getClassLoader(LoadedApk.java:709)
at android.app.LoadedApk.getResources(LoadedApk.java:936)
at android.app.ContextImpl.createAppContext(ContextImpl.java:2242)
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:5672)
at android.app.ActivityThread.-wrap1(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1661)
... 6 more`enter code here`
答案 0 :(得分：1)
您似乎已更换了
<android.support.constraint.ConstraintLayout
使用
<android.support.constraint.RelativeLayout
在您的xml文件中。您不需要android.support.constraint的前缀RelativeLayout，只需使用
<RelativeLayout