应用程序崩溃在Android 6.0启动，包含Logcat，新开发人员

时间：2015-11-03 09:02:34

标签： java android performance android-manifest android-6.0-marshmallow

所以我对Java的经验很少，但我可以快速学习。在Marshmallow 6.0中启动应用程序时。它突然崩溃了。我可以从Android Studio中的logcat获取此内容

跳过被纠正的文字

    E / AndroidRuntime：致命异常：主要     E / AndroidRuntime：进程：nezibo.com.dreamception，PID：1863     E / AndroidRuntime：java.lang.RuntimeException：无法启动活动ComponentInfo {nezibo.com.dreamception / nezibo.com.dreamception.activity.MainActivity}：java.lang.NullPointerException：尝试获取null数组的长度     E / AndroidRuntime：在android.app.ActivityThread.performLaunchActivity（ActivityThread.java:2416）     E / AndroidRuntime：在android.app.ActivityThread.handleLaunchActivity（ActivityThread.java:2476）     E / AndroidRuntime：在android.app.ActivityThread.-wrap11（ActivityThread.java）     E / AndroidRuntime：在android.app.ActivityThread $ H.handleMessage（ActivityThread.java:1344）     E / AndroidRuntime：在android.os.Handler.dispatchMessage（Handler.java:102）     E / AndroidRuntime：在android.os.Looper.loop（Looper.java:148）     E / AndroidRuntime：在android.app.ActivityThread.main（ActivityThread.java:5417）     E / AndroidRuntime：at java.lang.reflect.Method.invoke（Native Method）     E / AndroidRuntime：at com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:726）     E / AndroidRuntime：at com.android.internal.os.ZygoteInit.main（ZygoteInit.java:616）     E / AndroidRuntime：引起：java.lang.NullPointerException：尝试获取null数组的长度     E / AndroidRuntime：at nezibo.com.dreamception.utils.FileUtils.removeTMPFiles（FileUtils.java:31）     E / AndroidRuntime：at nezibo.com.dreamception.activity.MainActivity.init（MainActivity.java:186）     E / AndroidRuntime：at nezibo.com.dreamception.activity.MainActivity.onCreate（MainActivity.java:64）     E / AndroidRuntime：在android.app.Activity.performCreate（Activity.java:6237）     E / AndroidRuntime：在android.app.Instrumentation.callActivityOnCreate（Instrumentation.java:1107）     E / AndroidRuntime：在android.app.ActivityThread.performLaunchActivity（ActivityThread.java:2369）     E / AndroidRuntime：在android.app.ActivityThread.handleLaunchActivity（ActivityThread.java:2476）     E / AndroidRuntime：在android.app.ActivityThread.-wrap11（ActivityThread.java）     E / AndroidRuntime：在android.app.ActivityThread $ H.handleMessage（ActivityThread.java:1344）     E / AndroidRuntime：在android.os.Handler.dispatchMessage（Handler.java:102）     E / AndroidRuntime：在android.os.Looper.loop（Looper.java:148）     E / AndroidRuntime：在android.app.ActivityThread.main（ActivityThread.java:5417）     E / AndroidRuntime：at java.lang.reflect.Method.invoke（Native Method）     E / AndroidRuntime：at com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:726）     E / AndroidRuntime：在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:616）

CRASHLYTICS显示 

Fatal Exception: java.lang.RuntimeException: Unable to start activity ComponentInfo{nezibo.com.dreamception/nezibo.com.dreamception.activity.MainActivity}: java.lang.NullPointerException: Attempt to get length of null array
   at     android.app.ActivityThread.performLaunchActivity(ActivityThread.java)
   at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java)
   at android.app.ActivityThread.-wrap11(ActivityThread.java)
   at android.app.ActivityThread$H.handleMessage(ActivityThread.java)
   at android.os.Handler.dispatchMessage(Handler.java)
   at android.os.Looper.loop(Looper.java)
   at android.app.ActivityThread.main(ActivityThread.java)
   at java.lang.reflect.Method.invoke(Method.java)
   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java)
   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java)
Caused by java.lang.NullPointerException: Attempt to get length of null array
   at nezibo.com.dreamception.utils.FileUtils.removeTMPFiles(FileUtils.java)
   at nezibo.com.dreamception.activity.MainActivity.init(MainActivity.java)
   at nezibo.com.dreamception.activity.MainActivity.onCreate(MainActivity.java)
   at android.app.Activity.performCreate(Activity.java)
   at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java)
   at android.app.ActivityThread.performLaunchActivity(ActivityThread.java)
   at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java)
   at android.app.ActivityThread.-wrap11(ActivityThread.java)
   at android.app.ActivityThread$H.handleMessage(ActivityThread.java)
   at android.os.Handler.dispatchMessage(Handler.java)
   at android.os.Looper.loop(Looper.java)
   at android.app.ActivityThread.main(ActivityThread.java)
   at java.lang.reflect.Method.invoke(Method.java)
   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java)
   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java)

FileUtils.java 

package nezibo.com.dreamception.utils;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.media.MediaScannerConnection;
import android.net.Uri;
import android.os.Environment;
import android.provider.MediaStore;
import android.util.Log;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.util.ArrayList;

import nezibo.com.dreamception.Dreamception;
import nezibo.com.dreamception.activity.FilterActivity;

import static     android.support.v4.app.ActivityCompat.startActivityForResult;
public class FileUtils {

public static void removeTMPFiles(Context context){
    ArrayList<String> paths = new ArrayList<>();
    File dir = new File(Dreamception.GALLERY_LOCATION);
    for(File file : dir.listFiles()){
        if(file.getName().contains(FilterActivity.TEMP_FILE_MARKER)){
            paths.add(file.getAbsolutePath());
            file.delete();
        }
    }

    String[] mStringArray = new String[paths.size()];
    mStringArray = paths.toArray(mStringArray);
    MediaScannerConnection.scanFile(context, mStringArray, null, new MediaScannerConnection.OnScanCompletedListener() {
        /*
         */
        public void onScanCompleted(String path, Uri uri) {
            Log.i("ExternalStorage", "Scanned " + path + ":");
            Log.i("ExternalStorage", "-> uri=" + uri);
        }
    });
}
}

上面的小册子中的第31行 

for(File file : dir.listFiles()){

编辑，所以现在这就是现在发生的事情我在发布时修复了崩溃，它变得清晰了我需要改变为新android分配权限的方式。 

11-03 04:43:43.541 9552-9552/nezibo.com.dreamception E/libcrashlytics: Failed to find any usable unwinding libraries on the device, falling back to simple unwinding
11-03 04:43:43.676 9552-9552/nezibo.com.dreamception E/ACRA: ACRA#init called but no ReportsCrashes annotation on Application nezibo.com.dreamception
11-03 04:45:07.230 9552-10585/nezibo.com.dreamception E/AndroidRuntime: FATAL EXCEPTION: ModernAsyncTask #1
11-03 04:45:07.230 9552-10585/nezibo.com.dreamception E/AndroidRuntime: Process: nezibo.com.dreamception, PID: 9552
11-03 04:45:07.230 9552-10585/nezibo.com.dreamception E/AndroidRuntime: java.lang.RuntimeException: An error occurred while executing doInBackground()
11-03 04:45:07.230 9552-10585/nezibo.com.dreamception E/AndroidRuntime:     at android.support.v4.content.ModernAsyncTask$3.done(ModernAsyncTask.java:142)
11-03 04:45:07.230 9552-10585/nezibo.com.dreamception E/AndroidRuntime:     at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:354)
11-03 04:45:07.230 9552-10585/nezibo.com.dreamception E/AndroidRuntime:     at java.util.concurrent.FutureTask.setException(FutureTask.java:223)
11-03 04:45:07.230 9552-10585/nezibo.com.dreamception E/AndroidRuntime:     at java.util.concurrent.FutureTask.run(FutureTask.java:242)
11-03 04:45:07.230 9552-10585/nezibo.com.dreamception E/AndroidRuntime:     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
11-03 04:45:07.230 9552-10585/nezibo.com.dreamception E/AndroidRuntime:     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
11-03 04:45:07.230 9552-10585/nezibo.com.dreamception E/AndroidRuntime:     at java.lang.Thread.run(Thread.java:818)
11-03 04:45:07.230 9552-10585/nezibo.com.dreamception E/AndroidRuntime:  Caused by: java.lang.SecurityException: Permission Denial: reading com.android.providers.media.MediaProvider uri content://media/external/images/media from pid=9552, uid=10059 requires android.permission.READ_EXTERNAL_STORAGE, or grantUriPermission()
11-03 04:45:07.230 9552-10585/nezibo.com.dreamception E/AndroidRuntime:     at android.os.Parcel.readException(Parcel.java:1599)
11-03 04:45:07.230 9552-10585/nezibo.com.dreamception E/AndroidRuntime:     at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:183)
11-03 04:45:07.230 9552-10585/nezibo.com.dreamception E/AndroidRuntime:     at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:135)
11-03 04:45:07.230 9552-10585/nezibo.com.dreamception E/AndroidRuntime:     at android.content.ContentProviderProxy.query(ContentProviderNative.java:421)
11-03 04:45:07.230 9552-10585/nezibo.com.dreamception E/AndroidRuntime:     at android.content.ContentResolver.query(ContentResolver.java:491)
11-03 04:45:07.230 9552-10585/nezibo.com.dreamception E/AndroidRuntime:     at android.support.v4.content.ContentResolverCompatJellybean.query(ContentResolverCompatJellybean.java:29)
11-03 04:45:07.230 9552-10585/nezibo.com.dreamception E/AndroidRuntime:     at android.support.v4.content.ContentResolverCompat$ContentResolverCompatImplJB.query(ContentResolverCompat.java:57)
11-03 04:45:07.230 9552-10585/nezibo.com.dreamception E/AndroidRuntime:     at android.support.v4.content.ContentResolverCompat.query(ContentResolverCompat.java:125)
11-03 04:45:07.230 9552-10585/nezibo.com.dreamception E/AndroidRuntime:     at android.support.v4.content.CursorLoader.loadInBackground(CursorLoader.java:59)
11-03 04:45:07.230 9552-10585/nezibo.com.dreamception E/AndroidRuntime:     at android.support.v4.content.CursorLoader.loadInBackground(CursorLoader.java:37)
11-03 04:45:07.230 9552-10585/nezibo.com.dreamception E/AndroidRuntime:     at android.support.v4.content.AsyncTaskLoader.onLoadInBackground(AsyncTaskLoader.java:296)
11-03 04:45:07.230 9552-10585/nezibo.com.dreamception E/AndroidRuntime:     at android.support.v4.content.AsyncTaskLoader$LoadTask.doInBackground(AsyncTaskLoader.java:54)
11-03 04:45:07.230 9552-10585/nezibo.com.dreamception E/AndroidRuntime:     at android.support.v4.content.AsyncTaskLoader$LoadTask.doInBackground(AsyncTaskLoader.java:42)
11-03 04:45:07.230 9552-10585/nezibo.com.dreamception E/AndroidRuntime:     at android.support.v4.content.ModernAsyncTask$2.call(ModernAsyncTask.java:128)
11-03 04:45:07.230 9552-10585/nezibo.com.dreamception E/AndroidRuntime:     at java.util.concurrent.FutureTask.run(FutureTask.java:237)
11-03 04:45:07.230 9552-10585/nezibo.com.dreamception E/AndroidRuntime:     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113) 
11-03 04:45:07.230 9552-10585/nezibo.com.dreamception E/AndroidRuntime:     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588) 
11-03 04:45:07.230 9552-10585/nezibo.com.dreamception E/AndroidRuntime:     at java.lang.Thread.run(Thread.java:818) 
11-03 04:45:07.400 9552-9693/nezibo.com.dreamception E/Surface: getSlotFromBufferLocked: unknown buffer: 0xa1376b20
11-03 04:45:07.463 9552-9552/nezibo.com.dreamception E/ActivityThread: Activity nezibo.com.dreamception.activity.MainActivity has leaked ServiceConnection nezibo.com.dreamception.activity.MainActivity$6@b5b5ae2 that was originally bound here
11-03 04:45:07.463 9552-9552/nezibo.com.dreamception E/ActivityThread: android.app.ServiceConnectionLeaked: Activity nezibo.com.dreamception.activity.MainActivity has leaked ServiceConnection nezibo.com.dreamception.activity.MainActivity$6@b5b5ae2 that was originally bound here
11-03 04:45:07.463 9552-9552/nezibo.com.dreamception E/ActivityThread:     at android.app.LoadedApk$ServiceDispatcher.<init>(LoadedApk.java:1092)
11-03 04:45:07.463 9552-9552/nezibo.com.dreamception E/ActivityThread:     at android.app.LoadedApk.getServiceDispatcher(LoadedApk.java:986)
11-03 04:45:07.463 9552-9552/nezibo.com.dreamception E/ActivityThread:     at android.app.ContextImpl.bindServiceCommon(ContextImpl.java:1303)
11-03 04:45:07.463 9552-9552/nezibo.com.dreamception E/ActivityThread:     at android.app.ContextImpl.bindService(ContextImpl.java:1286)
11-03 04:45:07.463 9552-9552/nezibo.com.dreamception E/ActivityThread:     at android.content.ContextWrapper.bindService(ContextWrapper.java:604)
11-03 04:45:07.463 9552-9552/nezibo.com.dreamception E/ActivityThread:     at nezibo.com.dreamception.activity.MainActivity.initBilling(MainActivity.java:274)
11-03 04:45:07.463 9552-9552/nezibo.com.dreamception E/ActivityThread:     at nezibo.com.dreamception.activity.MainActivity.onCreate(MainActivity.java:62)
11-03 04:45:07.463 9552-9552/nezibo.com.dreamception E/ActivityThread:     at android.app.Activity.performCreate(Activity.java:6237)
11-03 04:45:07.463 9552-9552/nezibo.com.dreamception E/ActivityThread:     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)
11-03 04:45:07.463 9552-9552/nezibo.com.dreamception E/ActivityThread:     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)
11-03 04:45:07.463 9552-9552/nezibo.com.dreamception E/ActivityThread:     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
11-03 04:45:07.463 9552-9552/nezibo.com.dreamception E/ActivityThread:     at android.app.ActivityThread.-wrap11(ActivityThread.java)
11-03 04:45:07.463 9552-9552/nezibo.com.dreamception E/ActivityThread:     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
11-03 04:45:07.463 9552-9552/nezibo.com.dreamception E/ActivityThread:     at android.os.Handler.dispatchMessage(Handler.java:102)
11-03 04:45:07.463 9552-9552/nezibo.com.dreamception E/ActivityThread:     at android.os.Looper.loop(Looper.java:148)
11-03 04:45:07.463 9552-9552/nezibo.com.dreamception E/ActivityThread:     at android.app.ActivityThread.main(ActivityThread.java:5417)
11-03 04:45:07.463 9552-9552/nezibo.com.dreamception E/ActivityThread:     at java.lang.reflect.Method.invoke(Native Method)
11-03 04:45:07.463 9552-9552/nezibo.com.dreamception E/ActivityThread:     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
11-03 04:45:07.463 9552-9552/nezibo.com.dreamception E/ActivityThread:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
11-03 04:45:08.554 9552-9693/nezibo.com.dreamception E/Surface: getSlotFromBufferLocked: unknown buffer: 0xa1377ae0

明确权限请求。          

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="com.android.vending.BILLING" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.CAMERA" />
<!-- Allows access to the flashlight -->
<permission
    android:name="android.permission.FLASHLIGHT"
    android:permissionGroup="android.permission-group.HARDWARE_CONTROLS"
    android:protectionLevel="normal" />

<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.camera.autofocus" />

2 个答案:

答案 0 :(得分：2)

你只需要阅读stacktrace：

null

因此，请检查第31行的FileUtils中数组可能为''的原因。

答案 1 :(得分：0)

您的代码中有NullPointerException。在此处发布FileUtils.removeTMPFiles()方法的代码，以便我们提出建议。

Caused by java.lang.NullPointerException: Attempt to get length of null array
  at nezibo.com.dreamception.utils.FileUtils.removeTMPFiles(FileUtils.java)

建议更改：

    ArrayList<String> paths = new ArrayList<>();
    File dir = new File(Dreamception.GALLERY_LOCATIONc);
    for(File file : dir.listFiles()){

到

    ArrayList<String> paths = new ArrayList<>();
    File dir = new File(Dreamception.GALLERY_LOCATION);
    if(!dir.exists())return;
    for(File file : dir.listFiles()){

+++许可中的变更/请求的新代码

if(!Settings.System.canWrite(this)) { 
    requestPermissions(new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.READ_EXTERNAL_STORAGE}, 2909); 
} else { 
    // continue with your code 
}
相关问题
最新问题