我如何读取.txt和Android中显示为TextView的？ [英] How can I read .txt and display it as TextView in Android?

问题描述

我使用的是code以下，开始读SD卡中的txt文件，但如何将其显示为文本视图？

  {尝试               文件f =新的文件（Environment.getExternalStorageDirectory（）+/ FILENAME.TXT）;
               的FileInputStream fileIS =新的FileInputStream（F）;
               BUF的BufferedReader =新的BufferedReader（新的InputStreamReader（fileIS））;
               字符串readString =新的String（）;
               //只是阅读每一行，并把它传递调试程序
               而（（readString = buf.readLine（））！= NULL）{
                  Log.d（行，readString）;               }            }赶上（FileNotFoundException异常五）{               e.printStackTrace（）;            }赶上（IOException异常五）{               e.printStackTrace（）;            }
 

解决方案

这应该这样做：

 公共无效displayOutput（）
{
    文件SD卡= Environment.getExternalStorageDirectory（）;
    档案文件=新的文件（SD卡，/ TextFile.txt的）;
    StringBuilder的文本=新的StringBuilder（）;
    尝试{
        BR的BufferedReader =新的BufferedReader（新的FileReader（文件））;
        串线;
        而（（行= br.readLine（））！= NULL）{
            text.append（线）;
            text.append（'\\ n'）;
        }
    }
    赶上（IOException异常五）{
        Toast.makeText（getApplicationContext（），读取文件错误！，Toast.LENGTH_LONG）.show（）;
        e.printStackTrace（）;
    }
    赶上（FileNotFoundException异常五）{
        Toast.makeText（getApplicationContext（），找不到文件！，Toast.LENGTH_LONG）.show（）;
        e.printStackTrace（）;
    }
    TextView的输出=（的TextView）findViewById（R.id.output）;
    //假设输出是你的TextView的id
    output.setText（文本）;
}
 

I am using the code below to read the the txt files from my SD card, but how can I display it as Text View?

try{

               File f = new File(Environment.getExternalStorageDirectory()+"/filename.txt");
               FileInputStream fileIS = new FileInputStream(f);
               BufferedReader buf = new BufferedReader(new InputStreamReader(fileIS));
               String readString = new String();
               //just reading each line and pass it on the debugger  
               while((readString = buf.readLine())!= null){
                  Log.d("line: ", readString);

               }

            } catch (FileNotFoundException e) {

               e.printStackTrace();

            } catch (IOException e){

               e.printStackTrace();

            }

解决方案

This should do it :

public void displayOutput()
{
    File sdcard = Environment.getExternalStorageDirectory();
    File file = new File(sdcard,"/TextFile.txt");
    StringBuilder text = new StringBuilder();
    try {
        BufferedReader br = new BufferedReader(new FileReader(file));
        String line;
        while ((line = br.readLine()) != null) {
            text.append(line);
            text.append('\n');
        }
    }
    catch (IOException e) {
        Toast.makeText(getApplicationContext(),"Error reading file!",Toast.LENGTH_LONG).show();
        e.printStackTrace();
    } 
    catch (FileNotFoundException e) {
        Toast.makeText(getApplicationContext(),"File not found!",Toast.LENGTH_LONG).show();
        e.printStackTrace();
    }
    TextView output=(TextView) findViewById(R.id.output); 
    // Assuming that 'output' is the id of your TextView
    output.setText(text);
}

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