मैं सबूत-ऑफ-अवधारणा ऐप पर काम कर रहा हूं ताकि मैं इस सुविधा को एक बड़े ऐप में कार्यान्वित कर सकूं जो मैं कर रहा हूं। मैं जावा और एंड्रॉइड देव के लिए थोड़ा नया हूं लेकिन उम्मीद है कि यह एक प्रश्न का बहुत सरल या जटिल नहीं होना चाहिए।एंड्रॉइड ऐप में सीएसवी फ़ाइल पढ़ना
मूल रूप से, मैं एक CSV फ़ाइल से स्ट्रिंग की एक सूची में पढ़ सकते हैं और उस पर एप्लिकेशन की मुख्य गतिविधि सूची प्रदर्शित करने में उपयोगी बनाने के लिए कोशिश कर रहा हूँ।
मैं सीएसवी के दशक में पढ़ने के लिए एक बाहरी वर्ग का उपयोग कर रहा हूँ। यहाँ वर्ग कोड है:
CSVFile.java
package com.yourtechwhiz.listdisplay;
import android.util.Log;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;
public class CSVFile {
InputStream inputStream;
public CSVFile(InputStream inputStream){
this.inputStream = inputStream;
}
public List read(){
List resultList = new ArrayList();
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
try {
String csvLine;
while ((csvLine = reader.readLine()) != null) {
String[] row = csvLine.split(",");
resultList.add(row);
Log.d("VariableTag", row[0].toString());
}
}
catch (IOException ex) {
throw new RuntimeException("Error in reading CSV file: "+ex);
}
finally {
try {
inputStream.close();
}
catch (IOException e) {
throw new RuntimeException("Error while closing input stream: "+e);
}
}
return resultList;
}
}
यहाँ मेरी मुख्य गतिविधि कोड है:
MainActivity.java
package com.yourtechwhiz.listdisplay;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity {
// Array of strings that's used to display on screen
String[] mobileArray = {"Android","IPhone","WindowsMobile","Blackberry",
"WebOS","Ubuntu","Windows7","Max OS X"};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
prepArray();
//Display List on Activity
ArrayAdapter adapter = new ArrayAdapter<String>(this,
R.layout.activity_listview, mobileArray);
ListView listView = (ListView) findViewById(R.id.mobile_list);
listView.setAdapter(adapter);
}
//Get list of strings from CSV ready to use
private void prepArray() {
InputStream inputStream = getResources().openRawResource(R.raw.strings);
CSVFile csvFile = new CSVFile(inputStream);
List myList = csvFile.read();
//This is where it has an error
//Set first array in myList to this new array myArray
String[] myArray = myList.get(0);
}
}
मैं करने के लिए वास्तव में नहीं हूँ अभी तक मोबाइलएरे सरणी सेट करने का बिंदु। अभी मैं सिर्फ सूची वस्तु MyList से बाहर जानकारी "निकालने" करने के लिए कोशिश कर रहा हूँ ...
किसी ने मुझे यह कैसे किया जाता व्याख्या कर सकते हैं? शायद मैं पूरी तरह से सूची प्रकार को समझ नहीं रहा हूं। ऐसा लगता है कि जब परिणामसूची CSVFile रीड विधि में वापस आती है, तो इसे स्ट्रिंग सरणी ऑब्जेक्ट्स वाली एक सूची ऑब्जेक्ट के रूप में वापस कर दिया जाता है। लेकिन मुझे ऐसा काम करने के लिए प्रतीत नहीं होता है।
किसी भी मदद की सराहना की जाती है!
अंतिम संपादन (काम कर कोड)
private void prepArray() {
try{
CSVReader reader = new CSVReader(new InputStreamReader(getResources().openRawResource(R.raw.strings)));//Specify asset file name
String [] nextLine;
while ((nextLine = reader.readNext()) != null) {
// nextLine[] is an array of values from the line
System.out.println(nextLine[0] + nextLine[1] + "etc...");
Log.d("VariableTag", nextLine[0]);
}
}catch(Exception e){
e.printStackTrace();
Toast.makeText(this, "The specified file was not found", Toast.LENGTH_SHORT).show();
}
}
संपादित
अब मेरी prepArray समारोह ऐसा दिखाई देता है:
private void prepArray() {
try{
String csvfileString = this.getApplicationInfo().dataDir + File.separatorChar + "strings.csv"
File csvfile = new File(csvfileString);
CSVReader reader = new CSVReader(new FileReader("csvfile.getAbsolutePath()"));
String [] nextLine;
while ((nextLine = reader.readNext()) != null) {
// nextLine[] is an array of values from the line
System.out.println(nextLine[0] + nextLine[1] + "etc...");
}
}catch(FileNotFoundException e){
e.printStackTrace();
Toast.makeText(this, "The specified file was not found", Toast.LENGTH_SHORT).show();
}
}
फिर भी FileNotFoundException पैदा करता है।
संपादित 2/3
यहाँ लॉग उत्पादित की जाती है कि जब मैं तार (src \ मुख्य \ संपत्ति \ तार \ तार का एक सबफ़ोल्डर में strings.csv के साथ एक वास्तविक फोन पर अनुप्रयोग चलाने के लिए है।csv) में परिवर्तन के साथ आप कोड के लिए अनुरोध:
03/27 17:44:01: Launching app
$ adb push C:\Users\Roy\AndroidStudioProjects\ListDisplay\app\build\outputs\apk\app-debug.apk /data/local/tmp/com.yourtechwhiz.listdisplay
$ adb shell pm install -r "/data/local/tmp/com.yourtechwhiz.listdisplay"
pkg: /data/local/tmp/com.yourtechwhiz.listdisplay
Success
$ adb shell am start -n "com.yourtechwhiz.listdisplay/com.yourtechwhiz.listdisplay.MainActivity" -a android.intent.action.MAIN -c android.intent.category.LAUNCHER -D
Connecting to com.yourtechwhiz.listdisplay
D/HyLog: I : /data/font/config/sfconfig.dat, No such file or directory (2)
D/HyLog: I : /data/font/config/dfactpre.dat, No such file or directory (2)
D/HyLog: I : /data/font/config/sfconfig.dat, No such file or directory (2)
W/ActivityThread: Application com.yourtechwhiz.listdisplay is waiting for the debugger on port 8100...
I/System.out: Sending WAIT chunk
I/dalvikvm: Debugger is active
I/System.out: Debugger has connected
I/System.out: waiting for debugger to settle...
Connected to the target VM, address: 'localhost:8609', transport: 'socket'
I/System.out: waiting for debugger to settle...
I/System.out: waiting for debugger to settle...
I/System.out: waiting for debugger to settle...
I/System.out: waiting for debugger to settle...
I/System.out: waiting for debugger to settle...
I/System.out: waiting for debugger to settle...
I/System.out: waiting for debugger to settle...
I/System.out: debugger has settled (1498)
I/dalvikvm: Could not find method android.view.Window$Callback.onProvideKeyboardShortcuts, referenced from method android.support.v7.view.WindowCallbackWrapper.onProvideKeyboardShortcuts
W/dalvikvm: VFY: unable to resolve interface method 16152: Landroid/view/Window$Callback;.onProvideKeyboardShortcuts (Ljava/util/List;Landroid/view/Menu;I)V
D/dalvikvm: VFY: replacing opcode 0x72 at 0x0002
W/dalvikvm: VFY: unable to find class referenced in signature (Landroid/view/SearchEvent;)
I/dalvikvm: Could not find method android.view.Window$Callback.onSearchRequested, referenced from method android.support.v7.view.WindowCallbackWrapper.onSearchRequested
W/dalvikvm: VFY: unable to resolve interface method 16154: Landroid/view/Window$Callback;.onSearchRequested (Landroid/view/SearchEvent;)Z
D/dalvikvm: VFY: replacing opcode 0x72 at 0x0002
I/dalvikvm: Could not find method android.view.Window$Callback.onWindowStartingActionMode, referenced from method android.support.v7.view.WindowCallbackWrapper.onWindowStartingActionMode
W/dalvikvm: VFY: unable to resolve interface method 16158: Landroid/view/Window$Callback;.onWindowStartingActionMode (Landroid/view/ActionMode$Callback;I)Landroid/view/ActionMode;
D/dalvikvm: VFY: replacing opcode 0x72 at 0x0002
I/dalvikvm: Could not find method android.content.res.TypedArray.getChangingConfigurations, referenced from method android.support.v7.widget.TintTypedArray.getChangingConfigurations
W/dalvikvm: VFY: unable to resolve virtual method 455: Landroid/content/res/TypedArray;.getChangingConfigurations()I
D/dalvikvm: VFY: replacing opcode 0x6e at 0x0002
I/dalvikvm: Could not find method android.content.res.TypedArray.getType, referenced from method android.support.v7.widget.TintTypedArray.getType
W/dalvikvm: VFY: unable to resolve virtual method 477: Landroid/content/res/TypedArray;.getType (I)I
D/dalvikvm: VFY: replacing opcode 0x6e at 0x0008
I/dalvikvm: Could not find method android.widget.FrameLayout.startActionModeForChild, referenced from method android.support.v7.widget.ActionBarContainer.startActionModeForChild
W/dalvikvm: VFY: unable to resolve virtual method 16589: Landroid/widget/FrameLayout;.startActionModeForChild (Landroid/view/View;Landroid/view/ActionMode$Callback;I)Landroid/view/ActionMode;
D/dalvikvm: VFY: replacing opcode 0x6f at 0x0002
I/dalvikvm: Could not find method android.content.Context.getColorStateList, referenced from method android.support.v7.content.res.AppCompatResources.getColorStateList
W/dalvikvm: VFY: unable to resolve virtual method 269: Landroid/content/Context;.getColorStateList (I)Landroid/content/res/ColorStateList;
D/dalvikvm: VFY: replacing opcode 0x6e at 0x0006
I/dalvikvm: Could not find method android.content.res.Resources.getDrawable, referenced from method android.support.v7.widget.ResourcesWrapper.getDrawable
W/dalvikvm: VFY: unable to resolve virtual method 418: Landroid/content/res/Resources;.getDrawable (ILandroid/content/res/Resources$Theme;)Landroid/graphics/drawable/Drawable;
D/dalvikvm: VFY: replacing opcode 0x6e at 0x0002
I/dalvikvm: Could not find method android.content.res.Resources.getDrawableForDensity, referenced from method android.support.v7.widget.ResourcesWrapper.getDrawableForDensity
W/dalvikvm: VFY: unable to resolve virtual method 420: Landroid/content/res/Resources;.getDrawableForDensity (IILandroid/content/res/Resources$Theme;)Landroid/graphics/drawable/Drawable;
D/dalvikvm: VFY: replacing opcode 0x6e at 0x0002
E/dalvikvm: Could not find class 'android.graphics.drawable.RippleDrawable', referenced from method android.support.v7.widget.AppCompatImageHelper.hasOverlappingRendering
W/dalvikvm: VFY: unable to resolve instanceof 140 (Landroid/graphics/drawable/RippleDrawable;) in Landroid/support/v7/widget/AppCompatImageHelper;
D/dalvikvm: VFY: replacing opcode 0x20 at 0x000c
W/System.err: java.io.FileNotFoundException: /csvfile.getAbsolutePath(): open failed: ENOENT (No such file or directory)
W/System.err: at libcore.io.IoBridge.open(IoBridge.java:462)
W/System.err: at java.io.FileInputStream.<init>(FileInputStream.java:78)
W/System.err: at java.io.FileInputStream.<init>(FileInputStream.java:105)
W/System.err: at java.io.FileReader.<init>(FileReader.java:66)
W/System.err: at com.yourtechwhiz.listdisplay.MainActivity.prepArray(MainActivity.java:43)
W/System.err: at com.yourtechwhiz.listdisplay.MainActivity.onCreate(MainActivity.java:26)
W/System.err: at android.app.Activity.performCreate(Activity.java:5287)
W/System.err: at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
W/System.err: at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2145)
W/System.err: at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2231)
W/System.err: at android.app.ActivityThread.access$700(ActivityThread.java:139)
W/System.err: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1401)
W/System.err: at android.os.Handler.dispatchMessage(Handler.java:102)
W/System.err: at android.os.Looper.loop(Looper.java:137)
W/System.err: at android.app.ActivityThread.main(ActivityThread.java:5082)
W/System.err: at java.lang.reflect.Method.invokeNative(Native Method)
W/System.err: at java.lang.reflect.Method.invoke(Method.java:515)
W/System.err: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:782)
W/System.err: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:598)
W/System.err: at dalvik.system.NativeStart.main(Native Method)
W/System.err: Caused by: libcore.io.ErrnoException: open failed: ENOENT (No such file or directory)
W/System.err: at libcore.io.Posix.open(Native Method)
W/System.err: at libcore.io.BlockGuardOs.open(BlockGuardOs.java:110)
W/System.err: at libcore.io.IoBridge.open(IoBridge.java:446)
W/System.err: ... 19 more
I/Adreno-EGL: <qeglDrvAPI_eglInitialize:385>: EGL 1.4 QUALCOMM build: ()
OpenGL ES Shader Compiler Version: E031.24.00.01
Build Date: 12/27/13 Fri
Local Branch: qualcomm_only
Remote Branch:
Local Patches:
Reconstruct Branch:
D/OpenGLRenderer: Enabling debug mode 0
D/OpenGLRenderer: GL error from OpenGLRenderer: 0x502
E/OpenGLRenderer: GL_INVALID_OPERATION
नोट: 'csvLine.split (", ")' सही ढंग से कॉलम में अल्पविराम के * के लिए काम नहीं करेगा * –