我遇到了一个奇怪的问题。我的 asyncTask操作突然被一个未处理的异常终止。大约45％的任务正在完成然后终止。
这是我的logcat
01-26 12:13:48.216: I/System.out(4421): success
01-26 12:13:48.386: I/System.out(4421): success
01-26 12:13:48.576: I/System.out(4421): success
01-26 12:13:48.616: D/dalvikvm(4421): GC_CONCURRENT freed 473K, 48% free 3256K/6215K, external 0K/0K, paused 3ms+4ms
01-26 12:13:48.806: I/System.out(4421): success
01-26 12:13:48.806: W/dalvikvm(4421): threadid=9: thread exiting with uncaught exception (group=0x40018560)
01-26 12:13:48.806: E/AndroidRuntime(4421): FATAL EXCEPTION: AsyncTask #1
01-26 12:13:48.806: E/AndroidRuntime(4421): java.lang.RuntimeException: An error occured while executing doInBackground()
01-26 12:13:48.806: E/AndroidRuntime(4421): at android.os.AsyncTask$3.done(AsyncTask.java:200)
01-26 12:13:48.806: E/AndroidRuntime(4421): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:274)
01-26 12:13:48.806: E/AndroidRuntime(4421): at java.util.concurrent.FutureTask.setException(FutureTask.java:125)
01-26 12:13:48.806: E/AndroidRuntime(4421): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:308)
01-26 12:13:48.806: E/AndroidRuntime(4421): at java.util.concurrent.FutureTask.run(FutureTask.java:138)
01-26 12:13:48.806: E/AndroidRuntime(4421): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088)
01-26 12:13:48.806: E/AndroidRuntime(4421): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581)
01-26 12:13:48.806: E/AndroidRuntime(4421): at java.lang.Thread.run(Thread.java:1019)
01-26 12:13:48.806: E/AndroidRuntime(4421): Caused by: java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0
01-26 12:13:48.806: E/AndroidRuntime(4421): at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:257)
01-26 12:13:48.806: E/AndroidRuntime(4421): at java.util.ArrayList.get(ArrayList.java:311)
01-26 12:13:48.806: E/AndroidRuntime(4421): at android.gesture.Instance.temporalSampler(Instance.java:91)
01-26 12:13:48.806: E/AndroidRuntime(4421): at android.gesture.Instance.createInstance(Instance.java:76)
01-26 12:13:48.806: E/AndroidRuntime(4421): at android.gesture.GestureStore.addGesture(GestureStore.java:158)
01-26 12:13:48.806: E/AndroidRuntime(4421): at android.gesture.GestureLibrary.addGesture(GestureLibrary.java:68)
01-26 12:13:48.806: E/AndroidRuntime(4421): at com.android.pack.TestActivity.saveGesture(TestActivity.java:467)
01-26 12:13:48.806: E/AndroidRuntime(4421): at com.android.pack.TestActivity$A.doInBackground(TestActivity.java:102)
01-26 12:13:48.806: E/AndroidRuntime(4421): at com.android.pack.TestActivity$A.doInBackground(TestActivity.java:1)
01-26 12:13:48.806: E/AndroidRuntime(4421): at android.os.AsyncTask$2.call(AsyncTask.java:185)
01-26 12:13:48.806: E/AndroidRuntime(4421): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306)
01-26 12:13:48.806: E/AndroidRuntime(4421): ... 4 more
01-26 12:13:49.356: E/WindowManager(4421): Activity com.android.pack.TestActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@4053a358 that was originally added here
01-26 12:13:49.356: E/WindowManager(4421): android.view.WindowLeaked: Activity com.android.pack.TestActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@4053a358 that was originally added here
01-26 12:13:49.356: E/WindowManager(4421): at android.view.ViewRoot.<init>(ViewRoot.java:259)
01-26 12:13:49.356: E/WindowManager(4421): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:148)
01-26 12:13:49.356: E/WindowManager(4421): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91)
01-26 12:13:49.356: E/WindowManager(4421): at android.view.Window$LocalWindowManager.addView(Window.java:465)
01-26 12:13:49.356: E/WindowManager(4421): at android.app.Dialog.show(Dialog.java:241)
01-26 12:13:49.356: E/WindowManager(4421): at com.android.pack.TestActivity.addgestures(TestActivity.java:159)
01-26 12:13:49.356: E/WindowManager(4421): at com.android.pack.TestActivity.onOptionsItemSelected(TestActivity.java:404)
01-26 12:13:49.356: E/WindowManager(4421): at android.app.Activity.onMenuItemSelected(Activity.java:2205)
01-26 12:13:49.356: E/WindowManager(4421): at com.android.internal.policy.impl.PhoneWindow.onMenuItemSelected(PhoneWindow.java:776)
01-26 12:13:49.356: E/WindowManager(4421): at com.android.internal.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:143)
01-26 12:13:49.356: E/WindowManager(4421): at com.android.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:855)
01-26 12:13:49.356: E/WindowManager(4421): at com.android.internal.view.menu.IconMenuView.invokeItem(IconMenuView.java:532)
01-26 12:13:49.356: E/WindowManager(4421): at com.android.internal.view.menu.IconMenuItemView.performClick(IconMenuItemView.java:122)
01-26 12:13:49.356: E/WindowManager(4421): at android.view.View$PerformClick.run(View.java:9107)
01-26 12:13:49.356: E/WindowManager(4421): at android.os.Handler.handleCallback(Handler.java:587)
01-26 12:13:49.356: E/WindowManager(4421): at android.os.Handler.dispatchMessage(Handler.java:92)
01-26 12:13:49.356: E/WindowManager(4421): at android.os.Looper.loop(Looper.java:130)
01-26 12:13:49.356: E/WindowManager(4421): at android.app.ActivityThread.main(ActivityThread.java:3835)
01-26 12:13:49.356: E/WindowManager(4421): at java.lang.reflect.Method.invokeNative(Native Method)
01-26 12:13:49.356: E/WindowManager(4421): at java.lang.reflect.Method.invoke(Method.java:507)
01-26 12:13:49.356: E/WindowManager(4421): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:847)
01-26 12:13:49.356: E/WindowManager(4421): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:605)
01-26 12:13:49.356: E/WindowManager(4421): at dalvik.system.NativeStart.main(Native Method)
01-26 12:14:04.836: I/Process(4421): Sending signal. PID: 4421 SIG: 9
，这是AsyncTask类
class A extends AsyncTask<File[],Integer,Void>
{
private Context cnt;
int count=0;
@Override
protected void onPreExecute() {
}
A(Context context)
{
cnt=context;
}
protected Void doInBackground(File[]... params) {
// TODO Auto-generated method stub
File[] newfiles=params[0];
File[] temp=null;
int progress=0;
float dircnt=0;
int numberofdir=newfiles.length;
for(File b:newfiles)
{
count=0;
dirname=b.getName();
if(b.isDirectory())
{
temp=b.listFiles();
}
for(File a:temp)
{
gest=dotask.batchprocess(a.getPath());
if(gest!=null)
System.out.println("success");
String name=dirname+"_"+count;
saveGesture(name, gest);
count++;
}
dircnt=dircnt+1;
progress=(int)((dircnt/numberofdir)*100);
try {
Thread.sleep(60);
publishProgress(progress);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return null;
}
@Override
protected void onProgressUpdate(Integer... values) {
// increment progress bar by progress value
pd.setProgress(values[0]);
pd.setMessage("completed "+dirname);
}
protected void onPostExecute() {
pd.hide();
pd=null;
}
}
这是调用Asynctask对象并执行它的方法
public void addgestures()
{
cView.postInvalidate();
dotask.setH(cView.getH());
dotask.setW(cView.getW());
count=0;
files=null;
/*if(dir.isDirectory())
{
files=dir.listFiles();
}*/
files=dir.listFiles();
for(int i=0;i<files.length;i++)
{
System.out.println(files[i].getPath());
}
pd = new ProgressDialog(this);
pd.setMessage("Matching progress");
pd.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
pd.setMax(100);
pd.setCancelable(false);
pd.setProgress(0);
pd.show();
A a=new A(this);
a.execute(files);
}
程序的其余部分没有错误，因为大约40％的任务正在成功完成。所以我不会上传程序的其余部分。
**here is the TESTACTIVITY CLASS**
package com.android.pack;
import java.io.File;
import java.net.URISyntaxException;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.gesture.Gesture;
import android.gesture.GestureLibraries;
import android.gesture.GestureLibrary;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.os.Message;
import android.text.Editable;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.Toast;
public class TestActivity extends Activity {
/** Called when the activity is first created. */
int height;
int weight;
private ProgressDialog pd=null;
customview cView;
String path="";
String pathchk="";
String temp="";
String name=null;
float pathSmooth[];
private File mStoreFile;
Gesture gest;
File dir;
String dirname;
File[] files;
int count;
int Height;
int Weight;
task dotask;
Context ct;
private static GestureLibrary sStore=null;
private static final int FILE_SELECT_CODE = 0;
public void perform() //
{
cView.set_file(pathchk);
cView.postInvalidate();
}
class A extends AsyncTask<File[],Integer,Void>
{
private Context cnt;
int count=0;
@Override
protected void onPreExecute() {
}
A(Context context)
{
cnt=context;
}
protected Void doInBackground(File[]... params) {
// TODO Auto-generated method stub
File[] newfiles=params[0];
File[] temp=null;
int progress=0;
float dircnt=0;
int numberofdir=newfiles.length;
for(File b:newfiles)
{
count=0;
dirname=b.getName();
if(b.isDirectory())
{
temp=b.listFiles();
}
for(File a:temp)
{
gest=dotask.batchprocess(a.getPath());
if(gest!=null)
System.out.println("success");
String name=dirname+"_"+count;
saveGesture(name, gest);
count++;
}
dircnt=dircnt+1;
progress=(int)((dircnt/numberofdir)*100);
try {
Thread.sleep(60);
publishProgress(progress);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return null;
}
@Override
protected void onProgressUpdate(Integer... values) {
// increment progress bar by progress value
pd.setProgress(values[0]);
pd.setMessage("completed "+dirname);
}
protected void onPostExecute() {
pd.hide();
pd=null;
}
}
public void addgestures()
{
cView.postInvalidate();
dotask.setH(cView.getH());
dotask.setW(cView.getW());
count=0;
files=null;
/*if(dir.isDirectory())
{
files=dir.listFiles();
}*/
files=dir.listFiles();
for(int i=0;i<files.length;i++)
{
System.out.println(files[i].getPath());
}
pd = new ProgressDialog(this);
pd.setMessage("Matching progress");
pd.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
pd.setMax(100);
pd.setCancelable(false);
pd.setProgress(0);
pd.show();
A a=new A(this);
a.execute(files);
}
public void showFileChooser() {
Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
// File file = new File("/sdcard");
intent.setType("file://*");
intent.addCategory(Intent.CATEGORY_OPENABLE);
try {
startActivityForResult(
Intent.createChooser(intent, "Select a File to Upload"),
FILE_SELECT_CODE);
} catch (android.content.ActivityNotFoundException ex) {
// Potentially direct the user to the Market with a Dialog
Toast.makeText(this, "Please install a File Manager.",
Toast.LENGTH_SHORT).show();
}
}
public void smoothPoint()
{
float pathScale[]=cView.getPathSmooth();
int pi; // Index over all the points in the trace
int ti; // Index over all the traces of a tracegroup
float Xavg,Yavg;
//int numTraces=getNumTraces();
int numTraces=1;
int stopCount=0;
int numPoints =(pathScale.length)/2;
float xsd,ysd;
int count1=1,count2=1;
float m2=0,m1=0;
float sumX=0, sumY=0; //partial sum
float Xchannel []=new float[numPoints*2];
float Xdist=0,Ydist=0;
float Ychannel []=new float[numPoints*2];
float nXchannel[]= new float[numPoints*2*2];
float nYchannel[]=new float[numPoints*2*2];
int finalCount=1;
float n1Xchannel[]= new float[numPoints*4*2];
float n1Ychannel[]=new float[numPoints*4*2];
float xfinal[] = new float[numPoints*4*2];
float yfinal[]= new float[numPoints*4*2];
int valid[]=new int[numPoints];
Log.v("number of points",numPoints+"");
for(int i=0;i<numPoints;i++)
{
//valid[i]=1;
Xchannel[i]=pathScale[i*2];
Ychannel[i]=pathScale[i*2+1];
}
for(ti=0;ti<numTraces;ti++)
{
sumX=sumY=0;
for(pi=0;pi<numPoints-1;pi++)
{
sumX+=Math.abs((Math.abs(Xchannel[pi+1])-Math.abs(Xchannel[pi])));
sumY+=Math.abs((Math.abs(Ychannel[pi+1])-Math.abs(Ychannel[pi])));
}
}
for(pi=1;pi<numPoints-1;pi++)
{
m1=(Ychannel[pi]-Ychannel[pi-1])/(Xchannel[pi]-Xchannel[pi-1]);
m2=(Ychannel[pi+1]-Ychannel[pi])/(Xchannel[pi+1]-Xchannel[pi]);
if(m1*m2<0)
{
valid[pi]=0;
stopCount++;
}
}
nXchannel[0]=Xchannel[0];
nYchannel[0]=Ychannel[0];
for(pi=1;pi<numPoints;pi++)
{
nXchannel[pi*2-1]=(Xchannel[pi]+Xchannel[pi-1])/2;
nYchannel[pi*2-1]=(Ychannel[pi]+Ychannel[pi-1])/2;
//System.out.print(" \n mid x and y "+nXchannel[pi*2-1]+nYchannel[pi*2-1]);
nXchannel[pi*2]=Xchannel[pi];
nYchannel[pi*2]=Ychannel[pi];
count1+=2;
}
//System.out.println("new array... ");
n1Xchannel[0]=nXchannel[0];
n1Ychannel[0]=nYchannel[0];
for(pi=1;pi<count1;pi++)
{
n1Xchannel[pi*2-1]=(nXchannel[pi]+nXchannel[pi-1])/2;
n1Ychannel[pi*2-1]=(nYchannel[pi]+nYchannel[pi-1])/2;
//System.out.print(" \n mid x and y "+n1Xchannel[pi*2-1]+n1Ychannel[pi*2-1]);
n1Xchannel[pi*2]=nXchannel[pi];
count2+=2;
n1Ychannel[pi*2]=nYchannel[pi];
}
Log.v("Count1",count1+"");
Log.v("Count2",count2+"");
xfinal[0]=n1Xchannel[0];
yfinal[0]=n1Ychannel[0];
Xavg=sumX/(numPoints -1);
Log.v("finalCount",finalCount+"");
Log.v("Xavg",sumX+"");
Yavg=sumY/(numPoints-1) ;
for(pi=1;pi<count2-1;pi++)
{
Xdist=Math.abs((Math.abs(n1Xchannel[pi])-Math.abs(xfinal[finalCount-1])));
Ydist=Math.abs((Math.abs(n1Ychannel[pi])-Math.abs(yfinal[finalCount-1])));
if(Xdist>=Xavg||Ydist>=Yavg)
{
xfinal[finalCount]=n1Xchannel[pi];
yfinal[finalCount++]=n1Ychannel[pi];
}
}
pathSmooth=new float[finalCount*2];
for(pi=0;pi<finalCount;pi++)
{
pathSmooth[pi*2] = xfinal[pi];
pathSmooth[pi*2+1] = yfinal[pi];
//pnts.get(pi).x=(int) nXchannel[pi];
//pnts.get(pi).y=(int) nYchannel[pi];
////System.out.println("x "+(int)nXchannel[pi]+ " and y "+(int)nYchannel[pi]);
}
cView.setPathSmooth(pathSmooth);
}
protected void onActivityResult(int requestCode, int resultCode, Intent data)
{
switch (requestCode) {
case FILE_SELECT_CODE:
if (resultCode == RESULT_OK) {
// Get the Uri of the selected file
Uri uri = data.getData();
Log.v("check", "File Uri: " + uri.toString());
// Get the path
try {
path = FileUtils.getPath(this, uri);
pathchk=path.substring(12);
perform();
} catch (URISyntaxException e) {
// TODO Auto-generated catch block
Log.v("error", "File Path: "+pathchk);
}
Log.v("check", "File Path: "+path);
// Get the file instance
// File file = new File(path);
// Initiate the upload
}
break;
case 1:
if(resultCode==RESULT_OK)
{
Uri uri=data.getData();
dir=new File(uri.getPath());
dirname=dir.getName();
//addgestures();
}
break;
}
super.onActivityResult(requestCode, resultCode, data);
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
cView = (customview)findViewById(R.id.customview1);
LinearLayout ll = new LinearLayout(this);
ll.setOrientation(LinearLayout.VERTICAL);
mStoreFile= new File(Environment.getExternalStorageDirectory(), "gestures");
if (sStore == null) {
sStore = GestureLibraries.fromFile(mStoreFile);
}
dotask=new task();
//select=(Button)findViewById(R.id.button1);
}
public boolean onCreateOptionsMenu(Menu menu)
{
//call the base class to include system menus
super.onCreateOptionsMenu(menu);
menu.add(0,1,0,"Open File"); // title
menu.add(0,2,1,"Smoothen");
menu.add(0,3,2,"add to gesture library");
menu.add(0,4,3,"Assign a name");
menu.add(0,5,4,"select a folder");
menu.add(0,6,5,"Exit");
//It is important to return true to see the menu
return true;
}
public boolean onOptionsItemSelected(MenuItem item) {
// Handle item selection
switch (item.getItemId()) {
case 1:
showFileChooser();
return true;
case 2:
smoothPoint();
return true;
case 3:
/*if(name.length()<1)
Toast.makeText(getApplicationContext(), "Give a name to the gesture ist", Toast.LENGTH_LONG).show();
else
{
gest=cView.batchprocess(pathchk);
saveGesture(name, gest);
}*/
addgestures();
return true;
case 4:
nameDialog();
return true;
case 5:
Intent intent = new Intent("org.openintents.action.PICK_DIRECTORY");
intent.setData(Uri.parse("file:///sdcard"));
intent.putExtra("org.openintents.extra.TITLE", "Please select a folder");
intent.putExtra("org.openintents.extra.BUTTON_TEXT", "Use this folder");
startActivityForResult(intent, 1);
return true;
case 6:
Toast.makeText(getApplicationContext(), "exiting", Toast.LENGTH_LONG).show();
System.exit(1);
return true;
default:
return super.onOptionsItemSelected(item);
}
}
public void nameDialog()
{
AlertDialog.Builder alert = new AlertDialog.Builder(this);
alert.setTitle("Title");
alert.setMessage("Message");
// Set an EditText view to get user input
final EditText input = new EditText(this);
alert.setView(input);
alert.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
name = input.getText().toString();
//Log.d("name",name);
check();
// Do something with value!
}
});
alert.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
// Canceled.
}
});
alert.show();
}
public static GestureLibrary get()
{
return sStore;
}
public void check()
{
if(name.length()<1)
Toast.makeText(this,"No name is set for this gesture",Toast.LENGTH_SHORT).show();
else
Toast.makeText(this,"GESTURE NAME IS "+name,Toast.LENGTH_SHORT).show();
}
public void saveGesture(String name,Gesture gest)
{
final GestureLibrary store = get();
store.addGesture(name, gest);
store.save();
}
}
答案 0 :(得分：0)
它是否处理目录为空的用例？也许它可能会失败 - 让索引超出约束异常
答案 1 :(得分：0)
在这里查看Instance.java的代码：Instance.java。
您的代码在以下行中失败：
float[] pts = GestureUtils.temporalSampling(gesture.getStrokes().get(0), SEQUENCE_SAMPLE_SIZE);
看起来你添加的手势没有任何中风（我不知道手势）并导致IndexOutOfBounds异常。也许这有帮助...