Question

我有活动＆＃34;听＆＃34;打开文本文件，这意味着在清单中：

<intent-filter>
    <action android:name="android.intent.action.VIEW" />
    <category android:name="android.intent.category.DEFAULT" />
    <data android:mimeType="text/*" />
</intent-filter>

所以我导航到文件浏览器，找到一些文本文件并尝试打开它，正如预期的那样，此活动存在于可用应用程序列表中以完成操作。当活动启动时，我知道Activity获得了正确的文件名，但它将文件视为空（不将内容打印到日志中）。

备注：该文件不为空，其他应用可以读取他，文件路径不包含空格，没有例外或崩溃。

我在这里做错了什么？

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_display);
    //Get intent, action and MIME type
    Intent intent = getIntent();
    String action = intent.getAction();
    String type = intent.getType();
    if (Intent.ACTION_VIEW.equals(action) && type != null && "text/plain".equals(type)) {
        handleViewText(intent);  //Handle text being sent
    }
}

private void handleViewText(Intent intent) {
    Uri uri = intent.getData();
    //uri.getPath().toString(): /storage/emulated/0/dir/subDir/fileName.txt
    BufferedReader br = null;
    try {
        String sCurrentLine;
        InputStream is = getContentResolver().openInputStream(uri);
        br = new BufferedReader(new InputStreamReader(is));
        //This is also not working: br = new BufferedReader(new FileReader(uri.getPath()));
        while ((sCurrentLine = br.readLine()) != null) {
            Log.e("TAG", sCurrentLine);  //never enters here
        }
    } catch (Exception e) {
        //nothing
    } finally {
        try {
            if (br != null) br.close();
        } catch (Exception e) {
            //nothing
        }
    }
}

Answer 1

试试这段代码：

public String read(String fname){

         BufferedReader br = null;
         String response = null;

            try {

                StringBuffer output = new StringBuffer();
                String fpath = "/sdcard/"+fname+".txt";

                br = new BufferedReader(new FileReader(fpath));
                String line = "";
                while ((line = br.readLine()) != null) {
                    output.append(line +"n");
                }
                response = output.toString();

            } catch (IOException e) {
                e.printStackTrace();
                return null;

            }
            return response;

     }

Android中的Android读取文本文件，用于过滤打开文本文件

1 个答案: