Question

我正在尝试以编程方式使用log.i()读取用户输入的日志，如下所示，

try {
        Log.i("logs", "inside log.java");
        String filter = "logcat ";
        filter += "-d ";
        filter += "logs:I";
        // String[] command = new String[] { "logcat", "-s" , "logs:"+filter
        // };
        Process process = Runtime.getRuntime().exec(filter);
        BufferedReader bufferedReader = new BufferedReader(
                new InputStreamReader(process.getInputStream()));

        log = new StringBuilder();
        String line;
        while ((line = bufferedReader.readLine()) != null) {

            log.append(line);
            log.append("\n");
        }
        clear = (Button) findViewById(R.id.clear);
        clear.setOnClickListener(onCleared);
        tv = (TextView) findViewById(R.id.logview);
        tv.setText(log.toString());

    } catch (IOException ex) {
        Log.e("Logging", ex.toString());
    }

    // convert log to string
    final String logString = new String(log.toString());

    // create text file in SDCard
    File sdCard = Environment.getExternalStorageDirectory();
    File dir = new File(sdCard.getAbsolutePath() + "/myLogcat");
    dir.mkdirs();
    File file = new File(dir, "logcat.txt");

    try {
        // to write logcat in text file
        FileOutputStream fOut = new FileOutputStream(file);
        OutputStreamWriter osw = new OutputStreamWriter(fOut);

        // Write the string to the file
        osw.write(logString);
        osw.flush();
        osw.close();
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }

但它只是显示黑屏。但是当我尝试在adb shell中运行命令时，它可以工作。我的adb代码是，

 adb logcat -s logs:I

Answer 1

在尝试以编程方式将文件记录到文本时，我遇到了类似的问题。我认为这里发生的事情是日志读取过程阻塞了UI（主）线程，导致黑屏。

尝试将整个日志读取过程放入ASyncTask中。这使它对我有用！

Answer 2

您是否已将此添加到清单文件中？

<uses-permission android:name="android.permission.READ_LOGS" />

以编程方式使用过滤器读取日志

2 个答案: