java.lang.ArrayIndexOutOfBoundsException：length = 2;索引= 9

Question

我正在构建一个简单的文件浏览器，并使用 simple_list_item_1 和 onItemClick（AdapterView父视图，视图视图，int位置，长ID）在 ListView 上显示文件< / strong>此oncItemClick适用于所有其他文件夹点击 但点击最后两项我的应用程序崩溃并收到以下错误
java.lang.ArrayIndexOutOfBoundsException：length = 2;指数= 9 请看看错误的代码

public class UploadActivity extends AppCompatActivity {
private ListView listView;
protected File[] files;
protected LinkedList<String> pathList;
protected String path="/sdcard";
protected final String generalPath="/sdcard";
protected Bundle bundle;
private View emtyFolder;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_upload);
    pathList=new LinkedList<>();
    bundle=getIntent().getExtras();
    listView=(ListView)findViewById(R.id.local_files_listView);
    emtyFolder=getLayoutInflater().inflate(R.layout.emty_folder,null);



    openPath(path);


    listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN)
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

            if (files[position].isDirectory())
            {
                Log.e("Folder Name",files[position].getName());
                if(files[position].listFiles().length>0) {
                    for (int i=0; i<files[position].listFiles().length;i++){
                        Log.e("File ",files[i].getName());
                    }
                    String newpath = files[position].getName();
                    forwardPath(newpath);
                    openPath(path);
                }
                else {
                    emtyFolder();
                    String newpath = files[position].getName();
                    forwardPath(newpath);
                    listView.setEmptyView(emtyFolder);
                }

            }
            if (files[position].isFile()) {
                Log.e("Is a file","True");
                String host=bundle.get("host").toString();
                String user=bundle.get("user").toString();
                String password=bundle.get("password").toString();
                int port= Integer.parseInt(bundle.get("port").toString());
                String remote=bundle.get("remote").toString();
                Transaction transaction=new 
                Transaction(host,user,password,port,getApplicationContext());
                try {
                    Log.e("Upload","Starting");
                    boolean status=transaction.Upload(remote, new File(path + 
              "/" + files[position].getName()));
                    Log.e("Upload", String.valueOf(status));
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    });
}

public void backWardPath() {
    if (!pathList.isEmpty()) {
        this.path = generalPath;
        pathList.removeLast();
        for (int i = 0; i < pathList.size(); i++) {
            this.path = this.path + pathList.get(i);
        }
    }

    openPath(path);
}

public void forwardPath(String newPath) {
        this.path = generalPath;

    pathList.add("/" + newPath);
    for (int i = 0; i < pathList.size(); i++) {
        this.path = this.path + pathList.get(i);
    }
}

@Override
public void onBackPressed() {
    setContentView(R.layout.activity_upload);
    Log.e("Path",path);
    backWardPath();

}


public void openPath(String path) {
    File file = new File(path);
    files = file.listFiles();
    ArrayAdapter<File> arrayAdapter=new ArrayAdapter<File>(this,android.R.layout.simple_list_item_1,files);
    listView.setAdapter(arrayAdapter);
}


private void emtyFolder(){
    Toast.makeText(this,"Empty Folder",Toast.LENGTH_LONG).show();
   }

}

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Answer 1

编译器告诉您尝试访问超出数组范围的索引。

  

java.lang.ArrayIndexOutOfBoundsException：length = 2;指数= 9

数组的长度为2，并且您尝试使用索引9进行访问。检查编译器会告诉您问题出现的位置。

Answer 2

这部分：

for (int i=0; i<files[position].listFiles().length;i++){
    Log.e("File ",files[i].getName());
}

看起来非常可疑。 files[position]指示的目录中的文件数与files中的文件数完全没有关系。可能你需要另一组File个对象。