如何从资产文件夹中打开一个excel文件

我试图从资产文件夹使用Excel库打开Excel文件，但应用程序崩溃，我设法将两个代码相互结合，这就是为什么它不工作。 任何帮助？ 谢谢。

public class MainActivity extends Activity { Button open; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); open=(Button)findViewById(R.id.button1); open.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub File file = new File("file:///android_asset/data.xlsx"); try { Workbook workbook = Workbook.getWorkbook(file); } catch (BiffException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } MimeTypeMap map = MimeTypeMap.getSingleton(); String ext = MimeTypeMap.getFileExtensionFromUrl(file.getName()); String type = map.getMimeTypeFromExtension(ext); if (type == null) type = "*/*"; Intent intent = new Intent(Intent.ACTION_VIEW); Uri data = Uri.fromFile(file); intent.setDataAndType(data, type); startActivity(intent); } }); 

错误

  04-30 15:22:54.642: E/AndroidRuntime(22148): FATAL EXCEPTION: main 04-30 15:22:54.642: E/AndroidRuntime(22148): Process: com.ecxel, PID: 22148 04-30 15:22:54.642: E/AndroidRuntime(22148): java.lang.VerifyError: com/ecxel/MainActivity$1 04-30 15:22:54.642: E/AndroidRuntime(22148): at com.ecxel.MainActivity.onCreate(MainActivity.java:29) 04-30 15:22:54.642: E/AndroidRuntime(22148): at android.app.Activity.performCreate(Activity.java:5312) 04-30 15:22:54.642: E/AndroidRuntime(22148): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1111) 04-30 15:22:54.642: E/AndroidRuntime(22148): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2552) 04-30 15:22:54.642: E/AndroidRuntime(22148): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2653) 04-30 15:22:54.642: E/AndroidRuntime(22148): at android.app.ActivityThread.access$800(ActivityThread.java:156) 04-30 15:22:54.642: E/AndroidRuntime(22148): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1355) 04-30 15:22:54.642: E/AndroidRuntime(22148): at android.os.Handler.dispatchMessage(Handler.java:102) 04-30 15:22:54.642: E/AndroidRuntime(22148): at android.os.Looper.loop(Looper.java:157) 04-30 15:22:54.642: E/AndroidRuntime(22148): at android.app.ActivityThread.main(ActivityThread.java:5872) 04-30 15:22:54.642: E/AndroidRuntime(22148): at java.lang.reflect.Method.invokeNative(Native Method) 04-30 15:22:54.642: E/AndroidRuntime(22148): at java.lang.reflect.Method.invoke(Method.java:515) 04-30 15:22:54.642: E/AndroidRuntime(22148): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1069) 04-30 15:22:54.642: E/AndroidRuntime(22148): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:885) 

Answer 1

new File("file:///android_asset/data.xlsx")将不起作用。 资产不是文件; 他们只是在您的APK文件的ZIP存档的条目。

如果您的库接受InputStream作为加载电子表格的源，请使用getResources().getAssets().open("data.xlsx")在您的电子表格中获取这样的InputStream 。 否则，您需要将该文件从资产复制到内部存储器，以便您可以将实际的File提供给库。

Answer 2

你可以像这样尝试

  File file = new File(m.getInstrumentation().getContext().getExternalFilesDir(null), filename); FileInputStream fis = new FileInputStream(file); 

要么

你可以尝试像这样的代码。 如

 public class ReadFileAssetsActivity extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); TextView txtContent = (TextView) findViewById(R.id.txtContent); TextView txtFileName = (TextView) findViewById(R.id.txtFileName); ImageView imgAssets = (ImageView) findViewById(R.id.imgAssets); AssetManager assetManager = getAssets(); // To get names of all files inside the "Files" folder try { String[] files = assetManager.list("Files"); for(int i=0; i<files.length; i++) { txtFileName.append("\n File :"+i+" Name => "+files[i]); } } catch (IOException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } // To load text file InputStream input; try { input = assetManager.open("helloworld.txt"); int size = input.available(); byte[] buffer = new byte[size]; input.read(buffer); input.close(); // byte buffer into a string String text = new String(buffer); txtContent.setText(text); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } // To load image try { // get input stream InputStream ims = assetManager.open("android_logo_small.jpg"); // create drawable from stream Drawable d = Drawable.createFromStream(ims, null); // set the drawable to imageview imgAssets.setImageDrawable(d); } catch(IOException ex) { return; } } } 

如果你有任何关于上述代码的查询。 请按照如何从资源文件夹中读取文件（图像或文本文件）？