Question

我的好友和我正在Android Studio中编写一个简单的应用程序。按下按钮时，将打开一个新活动，其中包含您按下的按钮的名称，并在该文件中显示该文本。

我有生成第一组按钮的代码（这些是硬编码的），我可以得到按下按钮的名称。我的麻烦是阅读文本文件并显示内容。文本文件中的每一行都是一个需要作为按钮文本值的单词。我不能对这些词进行硬编码，因为它们可以经常更改。

实施例;在主活动上，按下标有＆＃34; Round＆＃34;的按钮，它会将您发送到一个页面，其中包含文本文件中名为＆＃34; round＆＃34;的所有单词。列为按钮。

我早些时候问了这个问题，但是因为太模糊而被搁置了。我希望这更清楚。

这是我正在使用的代码，但需要代码来读取文件。这不行。

我甚至无法显示第一行。文件内容是这个--- 管弯头减速器点击平坦 EC

请帮忙。提前谢谢。

public class test extends Activity {
int counter = 0;
protected void onCreate(Bundle savedInstanceState) {
    counter=0;

    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_content);
    TableLayout table = (TableLayout) findViewById(R.id.tblLayoutContent);

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

        // do reading, usually loop until end of file reading
        String mLine;
        while ((mLine = reader.readLine()) != null) {

            for (int row = 0; row < 10; row++){
                TableRow tblRow = new TableRow(this);
                tblRow.setPadding(5,30,5,5);
                table.addView(tblRow);
                int NUM_COL = 3;

                for (int col = 0; col != NUM_COL; col++){
                    Button btn = new Button(this);
                    btn.setText(mLine);
                    tblRow.addView(btn);
                    NUM_COL++;

                }
            }

        }
    } catch (IOException e) {
        //log the exception
    } finally {
        if (reader != null) {
            try {
                reader.close();
            } catch (IOException e) {
                //log the exception
            }
        }
    }
}
}

Here's an image of my structure

Answer 1

我找到了答案。谢谢你指点我正确的方向。这是

    try {
        InputStream is = getAssets().open("round.txt");

        // We guarantee that the available method returns the total
        // size of the asset...  of course, this does mean that a single
        // asset can't be more than 2 gigs.
        int size = is.available();

        // Read the entire asset into a local byte buffer.
        byte[] buffer = new byte[size];
        is.read(buffer);
        is.close();

        // Convert the buffer into a string.
        String text = new String(buffer);

        // Finally stick the string into the text view.
        // Replace with whatever you need to have the text into.

        TextView tv = (TextView)findViewById(R.id.text);
        tv.setText(text);

    } catch (IOException e) {
        // Should never happen!
        throw new RuntimeException(e);
    }

Answer 2

重写了代码，这是有效的代码。 BufferedReader读卡器; 尝试{ InputStream = getAssets（）。open（＆＃34; round.txt＆＃34;）;

        reader = new BufferedReader(new InputStreamReader(is));

        // Finally stick the string into the text of the button.

        TableLayout table = (TableLayout) findViewById(R.id.tblLayoutContent);

        String line = reader.readLine();
        int lineLength = (line.length());
        while (line != null){

            TableRow tblRow = new TableRow(this);
            tblRow.setPadding(5, 30, 5, 5);
            table.addView(tblRow);


            for (int col = 0; col < NUM_COL; col++) {
                Button btn = new Button(this);
                btn.setTextSize(14);

                btn.setText(line);
                tblRow.addView(btn);
                line = reader.readLine();
            }
        };

    } catch (IOException e) {
        // Should never happen!
        throw new RuntimeException(e);
    }

}

Answer 3

试试这个...添加 getResources（）

reader = new BufferedReader(
                new InputStreamReader(getResources().getAssets().open("round.txt")));

Answer 4

U可以逐行读取文件，如下所示：

        String filename = "filename.txt";
        BufferedReader bufferedReader = null;    
        try {
            bufferedReader = new BufferedReader(new InputStreamReader
                    (this.getAssets().open(filename), StandardCharsets.UTF_8));
            String line;
            while ((line = bufferedReader.readLine()) != null) {
              //add the lines in some arraylist if you want to set them.
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (bufferedReader != null) {
                try {
                    bufferedReader.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

Answer 5

在科特林，我们可以这样做

val string = requireContext().assets.open("round.txt").bufferedReader().use {
            it.readText()
        }

需要从android studio中的assets文件夹中的txt文件中读取

5 个答案: