获取个人应用代码并显示

我正在尝试获取应用程序代码并显示它，例如，如果按钮 X 启动一个新活动，则 textView 显示整个方法

我只到达了如何以 HTML 格式显示代码这个问题 https://stackoverflow.com/questions/1529068/is-it-possible-to-have-multiple-styles-inside-a-textview

但是有没有办法获取我的应用程序的代码，我认为有两种方法

1. 内部的一个通过应用程序本身获取它
2. 外部一个通过读取java文件然后过滤它并获取方法的文本

对此有什么想法吗？

提前致谢

正如其他人评论中提到的那样，上述目前不可能。我可以建议的是，将您的应用程序与资产文件夹中的源代码一起发送，并使用辅助函数在运行时从源代码中提取某些方法（您提出的第二种方法）。我已经编写了示例代码，但它是纯java的，需要移植到android（几行）。

注意：根据您的用例，您可能需要在提取后重新格式化代码。

希望能帮助到你 ：）

辅助方法的代码：

static String getTheCode(String classname ,String methodSignature ) throws FileNotFoundException {

     //**********************A few lines of code below need changing when porting ***********//

    // open file, your will be in the assets folder not in the home dir of user, don't forget the .java extension when porting

    File file = new File(System.getProperty("user.home") +"/"+ classname +".java");

    // get the source, you can use FileInputReader or some reader supported by android

    Scanner scanner = new Scanner(file);

    String source = "";
    while(scanner.hasNext()) {
       source += " "+ scanner.next();
    }


    //**********************The above code needs changing when porting **********//

    // extract code using the method signature

    methodSignature = methodSignature.trim();
    source = source.trim();

    //appending { to differentiate from argument as it can be matched also if in the same file
    methodSignature = methodSignature+"{";

    //making sure we find what we are looking for
    methodSignature = methodSignature.replaceAll("\\s*[(]\\s*", "(");
    methodSignature = methodSignature.replaceAll("\\s*[)]\\s*", ")");
    methodSignature = methodSignature.replaceAll("\\s*[,]\\s*", ",");
    methodSignature = methodSignature.replaceAll("\\s+", " ");


    source =source.replaceAll("\\s*[(]\\s*", "(");
    source = source.replaceAll("\\s*[)]\\s*", ")");
    source = source.replaceAll("\\s*[,]\\s*", ",");
    source = source.replaceAll("\\s+", " ");


    if(!source.contains(methodSignature)) return null;

    // trimming all text b4 method signature
    source = source.substring(source.indexOf(methodSignature));

    //getting last index, a methods ends when there are matching pairs of these {}
    int lastIndex = 0;

    int rightBraceCount = 0;
    int leftBraceCount = 0;

    char [] remainingSource = source.toCharArray();
    for (int i = 0; i < remainingSource.length ; i++
         ) {

        if(remainingSource[i] == '}'){

            rightBraceCount++;

            if(rightBraceCount == leftBraceCount){

                lastIndex = (i + 1);
                break;
            }

        }else if(remainingSource[i] == '{'){

            leftBraceCount++;
        }




    }


    return  source.substring(0 ,lastIndex);

}

用法示例（getTheCode 方法是静态的，位于名为 GetTheCode 的类中）：

public static void main(String... s) throws FileNotFoundException {



    System.out.println(GetTheCode.getTheCode("Main", "private static void shoutOut()"));
    System.out.println(GetTheCode.getTheCode("Main", "private static void shoutOut(String word)"));


}

Output:

private static void shoutOut(){ // nothing to here }
private static void shoutOut(String word){ // nothing to here }

注意：开始新活动时创建一个方法，例如

 private void myStartActivty(){

 Intent intent = new Intent(MyActivity.this, AnotherActivity.class);

    startActivity(intent);

}

然后在你的 onClick 中：

@Override
public void onClick(View v) {
    myStartActivity();

    myTextView.setText(GetTheCode.getTheCode("MyActivity","private void myStartActivity()"));
}

更新：移植了android的代码：

    import android.content.Context;

    import java.io.IOException;
    import java.util.Scanner;

    public class GetTheCode {


static String getTheCode(Context context, String classname , String methodSignature ) {

   Scanner scanner = null;
    String source = "";
    try {
        scanner = new Scanner(context.getAssets().open(classname+".java"));



    while(scanner.hasNext()) {
       source += " "+ scanner.next();
    }

    } catch (IOException e) {
        e.printStackTrace();
        return null;
    }
        scanner.close();

    // extract code using the method signature

    methodSignature = methodSignature.trim();
    source = source.trim();

    //appending { to differentiate from argument as it can be matched also if in the same file
    methodSignature = methodSignature+"{";

    //making sure we find what we are looking for
    methodSignature = methodSignature.replaceAll("\\s*[(]\\s*", "(");
    methodSignature = methodSignature.replaceAll("\\s*[)]\\s*", ")");
    methodSignature = methodSignature.replaceAll("\\s*[,]\\s*", ",");
    methodSignature = methodSignature.replaceAll("\\s+", " ");


    source =source.replaceAll("\\s*[(]\\s*", "(");
    source = source.replaceAll("\\s*[)]\\s*", ")");
    source = source.replaceAll("\\s*[,]\\s*", ",");
    source = source.replaceAll("\\s+", " ");


    if(!source.contains(methodSignature)) return null;

    // trimming all text b4 method signature
    source = source.substring(source.indexOf(methodSignature));

    //getting last index, a methods ends when there are matching pairs of these {}
    int lastIndex = 0;

    int rightBraceCount = 0;
    int leftBraceCount = 0;

    char [] remainingSource = source.toCharArray();
    for (int i = 0; i < remainingSource.length ; i++
         ) {

        if(remainingSource[i] == '}'){

            rightBraceCount++;

            if(rightBraceCount == leftBraceCount){

                lastIndex = (i + 1);
                break;
            }

        }else if(remainingSource[i] == '{'){

            leftBraceCount++;
        }




    }


    return  source.substring(0,lastIndex);

   }

}

Usage:

   // the method now takes in context as the first parameter, the line below was in an Activity
  Log.d("tag",GetTheCode.getTheCode(this,"MapsActivity","protected void onCreate(Bundle savedInstanceState)"));