在Android中找不到消息toast的文件异常



我实际上正在尝试在文本文件中搜索给定的字符串,该文本文件存储在我的Android应用程序中的assets文件夹中。我写的代码是:

public class MainActivity extends ActionBarActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Button button;
    final EditText obedittext;
    button =(Button)findViewById(R.id.button1);
    obedittext =(EditText)findViewById(R.id.editText1);

    button.setOnClickListener(
            new View.OnClickListener()
            {
                boolean textfound;
                public void onClick(View view)
                {
                    textfound = searchtext(obedittext.getText().toString());
                    if(textfound)
                        maketoast(obedittext.getText().toString());
                    else
                        maketoast("Unsuccessfull");
                }
    });
}
protected boolean searchtext(String string) {
    // TODO Auto-generated method stub

    BufferedReader br = null;
    try {
        String sCurrentLine;
        br = new BufferedReader(new FileReader("mneumo.txt"));
        while ((sCurrentLine = br.readLine()) != null) {
            if(sCurrentLine.equals(string)) {
                return true;
            }
        }
        br.close();

    } catch (IOException e) {
        e.printStackTrace();
    }
        finally{
        }
    return false;
}

private void maketoast(String string) {
    // TODO Auto-generated method stub
    Context context = getApplicationContext();
    Toast toast = Toast.makeText(context, string , Toast.LENGTH_SHORT);
    toast.show();
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();
    if (id == R.id.action_settings) {
        return true;
    }
    return super.onOptionsItemSelected(item);
}
}

我收到的错误是:

03-06 01:17:01.330: W/System.err(1170): java.io.FileNotFoundException: /mneumo.txt: open failed: ENOENT (No such file or directory)
03-06 01:17:01.330: W/System.err(1170):     at libcore.io.IoBridge.open(IoBridge.java:409)
03-06 01:17:01.330: W/System.err(1170):     at java.io.FileInputStream.<init>(FileInputStream.java:78)
03-06 01:17:01.340: W/System.err(1170):     at java.io.FileInputStream.<init>(FileInputStream.java:105)
03-06 01:17:01.340: W/System.err(1170):     at java.io.FileReader.<init>(FileReader.java:66)
03-06 01:17:01.340: W/System.err(1170):     at com.example.demo.MainActivity.searchtext(MainActivity.java:60)
03-06 01:17:01.340: W/System.err(1170):     at com.example.demo.MainActivity$1.onClick(MainActivity.java:41)

示例文件是

SPINAL ANESTHESIA AGENTS
XYLOCAINE: WHERE NOT TO USE WITH EPINEPHRINE
GENERAL ANAESTHESIA: EQUIPMENT CHECK PRIOR TO INDUCING

如果找到字符串,则应该显示带有该字符串的祝酒词。但它总是说"找不到文件"。我完全是个新手。

这是一个类似于字典的应用程序。

我确实在这个网站上提到了其他问题,但我仍然不知道问题出在哪里。我应该使用assetmanager还是其他什么?

您的代码语句

br = new BufferedReader(new FileReader("mneumo.txt"));

指的是错误的位置。因此,它无法读取该文件。相反,请按照替换您的上述行

br = new BufferedReader(new InputStreamReader(getAssets().open("mneumo.txt")));

这样,您的文件应该被找到并打开。存储在应用程序资产文件夹中的文件应始终以这种方式读取,而不是通过硬编码的目录字符串或应用程序相对路径。

您想从资产中读取,对吗?你需要使用AssetManager来实现这一点。请参阅以下内容:

    InputStream is;
    try {
        is = getAssets().open("myfile.txt");
        byte[] buffer = new byte[is.available()];
        is.read(buffer);
        is.close();
        Toast.makeText(this, new String(buffer, "UTF-8"), Toast.LENGTH_SHORT).show();
    } catch (IOException ex) {
        ex.printStackTrace();
    }

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