[Android]read file examples

本文介绍了一种通过执行shell命令来从指定路径的文件中查找包含特定索引字符串的行,并从中抽取所需值的方法。该方法适用于Android或Linux环境。

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    private String getStringFromFile(){
        String getStringFromFile= "";
        String cmdline = "";
        String cmdline_path = "/system/data";
        String indexString = "index";   
        Process process;
        try{
            process = new ProcessBuilder("cat", cmdline_path).start();
            BufferedReader br = new BufferedReader(new InputStreamReader(process.getInputStream()));
            while((cmdline = br.readLine())!=null)
            {
                if(cmdline.indexOf(indexString)>0)
                {
                    String [] cmd = cmdline.split(" ");
                    for(int i=0;i<=cmd.length;i++)
                    {
                        if(cmd[i].startsWith(indexString))
                        {
                            getStringFromFile= cmd[i].split("=")[1];
                            break;
                        }
                    }         
                }
            }
            br.close();
        }catch(Exception e){

        }
        return getStringFromFile;
    }
 
### IntelliJ IDEA IO Error Solution When encountering an IO error with the message 'Got minus one from a read call', this typically indicates that there is an issue related to network connections or file reading operations within the application running under IntelliJ IDEA. The problem can arise due to several reasons, including corrupted files, incorrect configurations, or issues with plugins. To address such errors effectively: #### Verify Project Configuration Ensure project settings are correctly configured especially when dealing with external libraries or native code integration as shown in Gradle configuration examples[^1]: ```groovy android { sourceSets { main { jniLibs.srcDirs = ['native-libs'] jni.srcDirs = [] // disable automatic ndk-build } } } ``` This ensures proper handling of JNI libraries which might otherwise cause unexpected behavior during runtime leading to potential IO exceptions. #### Check Network Settings If the application involves networking components, verify proxy settings inside IntelliJ IDEA preferences since misconfigured proxies could lead to premature closure of streams causing `-1` returns on reads indicating end-of-file was reached unexpectedly. #### Update Plugins and IDE Keeping both the development environment along with any relevant plugins up-to-date helps mitigate compatibility problems between different versions of tools used throughout the software stack. For instance, ensuring Maven projects have their lifecycle phases properly set so tasks like packaging execute without hitches[^2]: ```bash mvn package ``` Running `mvn clean install` may also help clear out old artifacts potentially interfering with current builds. #### Review Codebase for Resource Management Issues Inspect areas where input/output operations occur looking specifically at how resources are opened/closed. Improper management here often results in socket timeout errors manifesting through similar symptoms described by the user.
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