在Android中读取txt文件并输出为TextView

问题描述

我正在尝试读取已保存在目录中的文本文件，并将其作为TextView打印在屏幕上.这是我到目前为止的代码.但是，当我运行该应用程序时，它会创建一个吐司，上面写着错误读取文件".我在这里做错了什么?

I am trying to read a text file that is already saved in my directory and print it on the screen as a TextView. This is the code that I have so far. However, when I run the application, it creates a toast which says "Error Reading File". What am I doing wrong here?

public class sub extends Activity {

private TextView text;


protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.text);
    //text = (TextView) findViewById(R.id.summtext);
    //File file = new File("inputNews.txt");
    //StringBuilder text = new StringBuilder();
    try {
        InputStream in = openFileInput("inputNews.txt");

        if(in != null){
            InputStreamReader reader = new InputStreamReader(in);
            BufferedReader br = new BufferedReader(reader);
            StringBuilder text = new StringBuilder();
            String line;
            while ((line = br.readLine()) != null) {
                text.append(line);
                text.append('\n');
            }
            in.close();

        }

    }
    catch (IOException e) {
        Toast.makeText(getApplicationContext(),"Error reading file!",Toast.LENGTH_LONG).show();
        e.printStackTrace();
    }


    TextView output= (TextView) findViewById(R.id.summtext);
    output.setText((CharSequence) text);

}

}

推荐答案

如果要在项目中保留.txt文件，则必须在assets文件夹中找到它.
然后，您可以使用 AssetManger 进行访问.
阅读此有关如何创建assets文件夹，然后使用此代码的主题:

If you want to keep a .txt file in your Project, you must locate it in the assets folder.
Then you can access it with AssetManger .
Read this topic on how to create your assets folder, and then use this code:

public class subActivity extends Activity {

private TextView textView;
private StringBuilder text = new StringBuilder();

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.text);
    BufferedReader reader = null;

    try {
        reader = new BufferedReader(
            new InputStreamReader(getAssets().open("inputNews.txt")));

        // do reading, usually loop until end of file reading
        String mLine;
        while ((mLine = reader.readLine()) != null) {
            text.append(mLine);
            text.append('\n');
        }
    } catch (IOException e) {
        Toast.makeText(getApplicationContext(),"Error reading file!",Toast.LENGTH_LONG).show();
        e.printStackTrace();
    } finally {
        if (reader != null) {
        try {
            reader.close();
        } catch (IOException e) {
            //log the exception
        }
    }

    TextView output= (TextView) findViewById(R.id.summtext);
    output.setText((CharSequence) text);

 }
}

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