应用程序崩溃与WebView [英] App Crash with WebView
本文介绍了应用程序崩溃与WebView的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
请帮助我。我想在我的应用程序中放置一个WebView。如果我做一个新的项目，它工作正常。但是当我想将它放在另一个应用程序中时会崩溃。
Please help me. I want to put a WebView in my app. If i make a new project it works fine. But when i want to put it in another app it crash.
包括Mainactivity / Java文件/布局文件/ logcat
Included Mainactivity / Java file / layout file / logcat
MainActivity
MainActivity
import android.app.FragmentManager;
import android.os.Bundle;
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;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
private WebView mWebView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mWebView = (WebView) findViewById(R.id.webaanhoudingskaart);
WebSettings webSettings = mWebView.getSettings();
webSettings.setJavaScriptEnabled(true);
// Force links and redirects to open in the WebView instead of in a browser
mWebView.setWebViewClient(new WebViewClient());
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
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.setDrawerListener(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);
}
@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
FragmentManager fragmentManager = getFragmentManager();
if (id == R.id.nav_algemeen_toestand) {
fragmentManager.beginTransaction()
.replace(R.id.content_frame
, new Algemeen_Toestand())
.commit();
} else if (id == R.id.nav_algemeen_opdracht) {
fragmentManager.beginTransaction()
.replace(R.id.content_frame
, new Algemeen_Opdracht())
.commit();
} else if (id == R.id.nav_algemeen_uitvoering) {
fragmentManager.beginTransaction()
.replace(R.id.content_frame
, new Algemeen_Uitvoering())
.commit();
} else if (id == R.id.nav_algemeen_verzoring) {
fragmentManager.beginTransaction()
.replace(R.id.content_frame
, new Algemeen_Verzorging())
.commit();
} else if (id == R.id.nav_algemeen_tunue) {
fragmentManager.beginTransaction()
.replace(R.id.content_frame
, new Algemeen_Tunue())
.commit();
} else if (id == R.id.nav_algemeen_bevelvoering) {
fragmentManager.beginTransaction()
.replace(R.id.content_frame
, new Algemeen_Bevelvoering())
.commit();
} else if (id == R.id.nav_algemeen_scenario) {
fragmentManager.beginTransaction()
.replace(R.id.content_frame
, new Algemeen_Scenario())
.commit();
} else if (id == R.id.nav_operationeel_wedstrijdinformatie) {
fragmentManager.beginTransaction()
.replace(R.id.content_frame
, new Operationeel_Wedstrijdinformatie())
.commit();
} else if (id == R.id.nav_operationeel_tijdsschema) {
fragmentManager.beginTransaction()
.replace(R.id.content_frame
, new Operationeel_Tijdsschema())
.commit();
} else if (id == R.id.nav_operationeel_indeling) {
fragmentManager.beginTransaction()
.replace(R.id.content_frame
, new Operationeel_Indeling())
.commit();
} else if (id == R.id.nav_operationeel_verbindingsschema) {
fragmentManager.beginTransaction()
.replace(R.id.content_frame
, new Operationeel_Verbindingsschema())
.commit();
} else if (id == R.id.nav_operationeel_stdaion) {
fragmentManager.beginTransaction()
.replace(R.id.content_frame
, new Operationeel_Stadion())
.commit();
} else if (id == R.id.nav_operationeel_positie) {
fragmentManager.beginTransaction()
.replace(R.id.content_frame
, new Operationeel_Positie())
.commit();
} else if (id == R.id.nav_operationeel_aanhoudingskaart) {
fragmentManager.beginTransaction()
.replace(R.id.content_frame
, new Operationeel_Aanhoudingskaart())
.commit();
} else if (id == R.id.nav_operationeel_stdionverboden) {
fragmentManager.beginTransaction()
.replace(R.id.content_frame
, new Operationeel_Stadionverboden())
.commit();
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
Java
package remco.politiewillemiiapp;
import android.app.Fragment;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
/**
* Created by Remco on 6-4-2016.
*/
public class Operationeel_Aanhoudingskaart extends Fragment {
View myView;
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
myView = inflater.inflate(R.layout.operationeel_aanhoudingskaart, container, false);
return myView;
}
布局
Layout
<WebView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/webaanhoudingskaart" />
</RelativeLayout>
LogCat
04-21 21:27:41.151 29717-29717/? E/Zygote: v2
04-21 21:27:41.151 29717-29717/? I/libpersona: KNOX_SDCARD checking this for 10375
04-21 21:27:41.151 29717-29717/? I/libpersona: KNOX_SDCARD not a persona
04-21 21:27:41.151 29717-29717/? I/SELinux: Function: selinux_compare_spd_ram, index[1], SPD-policy is existed. and_ver=SEPF_SM-G920F_5.1.1 ver=38
04-21 21:27:41.151 29717-29717/? W/SELinux: Function: selinux_compare_spd_ram, index[1], priority [2], priority version is VE=SEPF_SECMOBILE_6.0.1_0004
04-21 21:27:41.151 29717-29717/? E/Zygote: accessInfo : 0
04-21 21:27:41.151 29717-29717/? W/SELinux: SELinux: seapp_context_lookup: seinfo=default, level=s0:c512,c768, pkgname=remco.politiewillemiiapp
04-21 21:27:41.151 29717-29717/? I/art: Late-enabling -Xcheck:jni
04-21 21:27:41.181 29717-29717/? D/TimaKeyStoreProvider: TimaSignature is unavailable
04-21 21:27:41.181 29717-29717/? D/ActivityThread: Added TimaKeyStore provider
04-21 21:27:41.221 29717-29717/remco.politiewillemiiapp W/ResourcesManager: getTopLevelResources: /data/app/remco.politiewillemiiapp-2/base.apk / 1.0 running in remco.politiewillemiiapp rsrc of package remco.politiewillemiiapp
04-21 21:27:41.221 29717-29717/remco.politiewillemiiapp I/InjectionManager: Inside getClassLibPath + mLibMap{0=, 1=}
04-21 21:27:41.221 29717-29717/remco.politiewillemiiapp D/ResourcesManager: For user 0 new overlays fetched Null
04-21 21:27:41.241 29717-29717/remco.politiewillemiiapp I/InjectionManager: Inside getClassLibPath caller
04-21 21:27:41.241 29717-29717/remco.politiewillemiiapp W/System: ClassLoader referenced unknown path: /data/app/remco.politiewillemiiapp-2/lib/arm64
04-21 21:27:41.241 29717-29717/remco.politiewillemiiapp D/InjectionManager: InjectionManager
04-21 21:27:41.241 29717-29717/remco.politiewillemiiapp D/InjectionManager: fillFeatureStoreMap remco.politiewillemiiapp
04-21 21:27:41.241 29717-29717/remco.politiewillemiiapp I/InjectionManager: Constructor remco.politiewillemiiapp, Feature store :{}
04-21 21:27:41.241 29717-29717/remco.politiewillemiiapp I/InjectionManager: featureStore :{}
04-21 21:27:41.251 29717-29717/remco.politiewillemiiapp W/ResourcesManager: getTopLevelResources: /data/app/remco.politiewillemiiapp-2/base.apk / 1.0 running in remco.politiewillemiiapp rsrc of package remco.politiewillemiiapp
04-21 21:27:41.251 29717-29717/remco.politiewillemiiapp W/ResourcesManager: getTopLevelResources: /data/app/remco.politiewillemiiapp-2/base.apk / 1.0 running in remco.politiewillemiiapp rsrc of package remco.politiewillemiiapp
04-21 21:27:41.321 29717-29717/remco.politiewillemiiapp D/AbsListView: Get MotionRecognitionManager
04-21 21:27:41.321 29717-29717/remco.politiewillemiiapp E/MotionRecognitionManager: mSContextService = android.hardware.scontext.ISContextService$Stub$Proxy@c948c05
04-21 21:27:41.321 29717-29717/remco.politiewillemiiapp E/MotionRecognitionManager: motionService = com.samsung.android.motion.IMotionRecognitionService$Stub$Proxy@ec7545a
04-21 21:27:41.321 29717-29717/remco.politiewillemiiapp E/MotionRecognitionManager: motionService = com.samsung.android.motion.IMotionRecognitionService$Stub$Proxy@ec7545a
04-21 21:27:41.821 29717-29717/remco.politiewillemiiapp D/skia: ---- fAsset->read(2769) returned 0
04-21 21:27:41.831 29717-29717/remco.politiewillemiiapp D/AndroidRuntime: Shutting down VM
04-21 21:27:41.831 29717-29717/remco.politiewillemiiapp E/AndroidRuntime: FATAL EXCEPTION: main
Process: remco.politiewillemiiapp, PID: 29717
java.lang.RuntimeException: Unable to start activity ComponentInfo{remco.politiewillemiiapp/remco.politiewillemiiapp.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'android.webkit.WebSettings android.webkit.WebView.getSettings()' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3253)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3349)
at android.app.ActivityThread.access$1100(ActivityThread.java:221)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1794)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:158)
at android.app.ActivityThread.main(ActivityThread.java:7224)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.webkit.WebSettings android.webkit.WebView.getSettings()' on a null object reference
at remco.politiewillemiiapp.MainActivity.onCreate(MainActivity.java:26)
at android.app.Activity.performCreate(Activity.java:6876)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1135)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3206)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3349)
at android.app.ActivityThread.access$1100(ActivityThread.java:221)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1794)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:158)
at android.app.ActivityThread.main(ActivityThread.java:7224)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
推荐答案
您尚未初始化您的webSetting，因此它显示错误null对象引用。请初始化它并重新运行该项目。
You haven't initialized your webSetting, so its showing the error "null object reference". Please initialize it and rerun the project.
WebSettings webSettings = new WebSettings();
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