我正在创建一个用于将文件下载到手机的应用程序。该应用程序在少于23个的设备上运行良好,但在SDK> 23个设备上崩溃。我已成功授予运行时权限。但是在下载文件期间仍然会使应用程序崩溃。
Permission.java
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.splash);
if (Build.VERSION.SDK_INT < 23) {
Toast.makeText(Permission.this,
"Build Version Less than 23", Toast.LENGTH_LONG).show();
startActivity(new Intent(this, MainActivity.class));
}
else if (checkSelfPermission(android.Manifest.permission.WRITE_EXTERNAL_STORAGE)
== PackageManager.PERMISSION_GRANTED) {
Toast.makeText(Permission.this,
"Permission Already Granted", Toast.LENGTH_LONG).show();
startActivity(new Intent(this, MainActivity.class));
status = 1;
} else {
ActivityCompat.requestPermissions(this, new String[]{"android.permission.WRITE_EXTERNAL_STORAGE"}, this.REQUEST_CODE);
}
}
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
if (requestCode == this.REQUEST_CODE && grantResults.length == 1 && grantResults[0] == 0) {
Toast.makeText(Permission.this,
"Permission Granted Message", Toast.LENGTH_LONG).show();
startActivity(new Intent(this, MainActivity.class));
}
else {
Toast.makeText(Permission.this,
"Permission Denied", Toast.LENGTH_LONG).show();
}
}
因此,该应用要求获得许可,我已成功授予它。但是在下载过程中,我正在获取此日志。
---------崩溃开始
E / AndroidRuntime:致命例外:Thread-153
流程:us.browserapp.manager,PID:2898
java.lang.RuntimeException:java.io.IOException:打开失败:ENOENT(无此类文件或目录)
在我们这里.browserapp.manager.get.DownloadManagerImpl $ Initializer.run(DownloadManagerImpl.java:210)
由以下原因引起:java.io.IOException:打开失败:ENOENT(没有这样的文件或目录)
在java.io.File.createNewFile(File.java:939)
在我们这里.browserapp.manager.get.DownloadManagerImpl $ Initializer.run(DownloadManagerImpl.java:202)
引起原因:android.system.ErrnoException:打开失败:ENOENT(无此类文件或目录)
在libcore.io.Posix.open(本机方法)
在libcore.io.BlockGuardOs.open(BlockGuardOs.java:186)
在java.io.File.createNewFile(File.java:932)
在我们这里.browserapp.manager.get.DownloadManagerImpl $ Initializer.run(DownloadManagerImpl.java:202)
E /表面:getSlotFromBufferLocked:未知缓冲区:0xae70c540
E / ActivityThread:活动us.browserapp.manager.ui.main.MainActivity泄漏了ServiceConnection us.browserapp.manager.ui.main.MainActivity$1@73e5314,它最初绑定在此处
android.app.ServiceConnectionLeaked:活动us.browserapp.manager.ui.main.MainActivity泄漏了最初绑定在此处的ServiceConnection us.browserapp.manager.ui.main.MainActivity$1@73e5314
在android.app.LoadedApk $ ServiceDispatcher。(LoadedApk.java:1092)
在android.app.LoadedApk.getServiceDispatcher(LoadedApk.java:986)
在android.app.ContextImpl.bindServiceCommon(ContextImpl.java:1303)
在android.app.ContextImpl.bindService(ContextImpl.java:1286)
在android.content.ContextWrapper.bindService(ContextWrapper.java:604)
在我们.browserapp.manager.ui.main.MainActivity.onCreate(MainActivity.java:104)
在android.app.Activity.performCreate(Activity.java:6237)
在android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)
在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)
在android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
在android.app.ActivityThread.-wrap11(ActivityThread.java)
在android.app.ActivityThread $ H.handleMessage(ActivityThread.java:1344)
在android.os.Handler.dispatchMessage(Handler.java:102)
在android.os.Looper.loop(Looper.java:148)
在android.app.ActivityThread.main(ActivityThread.java:5417)
在java.lang.reflect.Method.invoke(本机方法)
在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:726)
在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
E / ActivityThread:活动us.browserapp.manager.ui.main.MainActivity已泄漏ServiceConnection us.browserapp.manager.ui.fragment.MissionsFragment$1@961c89d,该绑定最初绑定在此处
android.app.ServiceConnectionLeaked:活动us.browserapp.manager.ui.main.MainActivity泄漏了最初绑定在此处的ServiceConnection us.browserapp.manager.ui.fragment.MissionsFragment$1@961c89d
在android.app.LoadedApk $ ServiceDispatcher。(LoadedApk.java:1092)
在android.app.LoadedApk.getServiceDispatcher(LoadedApk.java:986)
在android.app.ContextImpl.bindServiceCommon(ContextImpl.java:1303)
在android.app.ContextImpl.bindService(ContextImpl.java:1286)
在android.content.ContextWrapper.bindService(ContextWrapper.java:604)
在我们这里.browserapp.manager.ui.fragment.MissionsFragment.onCreateView(MissionsFragment.java:71)
在android.app.Fragment.performCreateView(Fragment.java:2220)
在android.app.FragmentManagerImpl.moveToState(FragmentManager.java:973)
在android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1148)
在android.app.BackStackRecord.run(BackStackRecord.java:793)
在android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1535)
在android.app.FragmentManagerImpl $ 1.run(FragmentManager.java:482)
在android.os.Handler.handleCallback(Handler.java:739)
在android.os.Handler.dispatchMessage(Handler.java:95)
在android.os.Looper.loop(Looper.java:148)
在android.app.ActivityThread.main(ActivityThread.java:5417)
在java.lang.reflect.Method.invoke(本机方法)
在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:726)
在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
I / Process:正在发送信号。 PID:2898 SIG:9
申请已终止。
DownloadManagerImpl.java
public class DownloadManagerImpl implements DownloadManager
{
private static final String TAG = DownloadManagerImpl.class.getSimpleName();
private Context mContext;
private String mLocation;
protected ArrayList<DownloadMission> mMissions = new ArrayList<DownloadMission>();
public DownloadManagerImpl(Context context, String location) {
mContext = context;
mLocation = location;
loadMissions();
}
@Override
public int startMission(String url, String name, int threads) {
DownloadMission mission = new DownloadMission();
mission.url = url;
mission.name = name;
mission.location = mLocation;
mission.timestamp = System.currentTimeMillis();
mission.threadCount = threads;
new Initializer(mContext, mission).start();
return insertMission(mission);
}
@Override
public void resumeMission(int i) {
DownloadMission d = getMission(i);
if (!d.running && d.errCode == -1) {
d.start();
}
}
@Override
public void pauseMission(int i) {
DownloadMission d = getMission(i);
if (d.running) {
d.pause();
}
}
@Override
public void deleteMission(int i) {
getMission(i).delete();
mMissions.remove(i);
}
private void loadMissions() {
File f = new File(mLocation);
if (f.exists() && f.isDirectory()) {
File[] subs = f.listFiles();
for (File sub : subs) {
if (sub.isDirectory()) {
continue;
}
if (sub.getName().endsWith(".fdm")) {
String str = Utility.readFromFile(sub.getAbsolutePath());
if (str != null && !str.trim().equals("")) {
if (DEBUG) {
Log.d(TAG, "loading mission " + sub.getName());
Log.d(TAG, str);
}
DownloadMission mis = new Gson().fromJson(str, DownloadMission.class);
if (mis.finished) {
sub.delete();
continue;
}
mis.running = false;
mis.recovered = true;
insertMission(mis);
}
} else if (!sub.getName().startsWith(".") && !new File(sub.getPath() + ".fdm").exists()) {
// Add a dummy mission for downloaded files
DownloadMission mis = new DownloadMission();
mis.length = sub.length();
mis.done = mis.length;
mis.finished = true;
mis.running = false;
mis.name = sub.getName();
mis.location = mLocation;
mis.timestamp = sub.lastModified();
insertMission(mis);
}
}
}
}
@Override
public DownloadMission getMission(int i) {
return mMissions.get(i);
}
@Override
public int getCount() {
return mMissions.size();
}
private int insertMission(DownloadMission mission) {
int i = -1;
DownloadMission m = null;
if (mMissions.size() > 0) {
do {
m = mMissions.get(++i);
} while (m.timestamp > mission.timestamp && i < mMissions.size() - 1);
//if (i > 0) i--;
} else {
i = 0;
}
mMissions.add(i, mission);
return i;
}
@Override
public String getLocation() {
return mLocation;
}
private class Initializer extends Thread {
private Context context;
private DownloadMission mission;
public Initializer(Context context, DownloadMission mission) {
this.context = context;
this.mission = mission;
}
@Override
public void run() {
try {
URL url = new URL(mission.url);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
mission.length = conn.getContentLength();
if (mission.length <= 0) {
mission.errCode = DownloadMission.ERROR_SERVER_UNSUPPORTED;
//mission.notifyError(DownloadMission.ERROR_SERVER_UNSUPPORTED);
return;
}
// Open again
conn = (HttpURLConnection) url.openConnection();
conn.setRequestProperty("Range", "bytes=" + (mission.length - 10) + "-" + mission.length);
if (conn.getResponseCode() != 206) {
// Fallback to single thread if no partial content support
mission.fallback = true;
if (DEBUG) {
Log.d(TAG, "falling back");
}
}
if (DEBUG) {
Log.d(TAG, "response = " + conn.getResponseCode());
}
mission.blocks = mission.length / BLOCK_SIZE;
if (mission.threadCount > mission.blocks) {
mission.threadCount = (int) mission.blocks;
}
if (mission.threadCount <= 0) {
mission.threadCount = 1;
}
if (mission.blocks * BLOCK_SIZE < mission.length) {
mission.blocks++;
}
new File(mission.location).mkdirs();
new File(mission.location + "/" + mission.name).createNewFile();
RandomAccessFile af = new RandomAccessFile(mission.location + "/" + mission.name, "rw");
af.setLength(mission.length);
af.close();
mission.start();
} catch (Exception e) {
// TODO Notify
throw new RuntimeException(e);
}
}
}
}
有什么想法吗?我为此损失了将近3天。注意:应用程序在Lollipop设备中的运行情况极好。
最佳答案
这可能是由于您试图使用无效路径创建目录这一事实。例如,如果您尝试在没有权限的位置创建目录,则会发生这种情况。在这种情况下,对mkdirs
的调用将失败,并且随后对createNewFile
的调用将引发异常,因为从未实际创建目录。
关于java - 许可授予的应用程序在棉花糖中崩溃,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/40371993/