我正在尝试获取应用代码并显示它，例如，如果按钮X启动新活动，则textView显示整个方法
我只了解如何以this question
显示HTML格式的代码但是有没有办法让我的应用程序的代码出来，我认为有两种方式
对此有任何想法吗？
提前致谢
答案 0 :(得分：3)
以上目前不可能如其他人所说的那样是评论。我可以建议使用资源文件夹中的源代码运送您的应用程序，并使用辅助函数在运行时从源中提取某些方法（您的第二个提议的方法）。我已经编写了示例代码，但它是纯java，需要移植到android（几行）。
注意：根据您的使用情况，您可能需要在提取后重新格式化代码。
希望有所帮助：）
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);
}
示例用法（getTheCode方法是静态的，并且在名为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)"));
}
输出：
private static void shoutOut(){ // nothing to here }
private static void shoutOut(String word){ // nothing to here }
注意：开始新活动时，请创建一个方法，例如
private void myStartActivty(){
Intent intent = new Intent(MyActivity.this, AnotherActivity.class);
startActivity(intent);
}
然后在你的onClick：
@Override
public void onClick(View v) {
myStartActivity();
myTextView.setText(GetTheCode.getTheCode("MyActivity","private void myStartActivity()"));
}
更新：为Android安装了代码：
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);
}
}
<强>用法：
// 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)"));
答案 1 :(得分：2)
让我们从更广泛的问题概述开始：
显示应用代码
按X按钮
使用显示方法
目标是执行以下操作：
我们可以使用一些方法动态运行Java / Android代码。我亲自这样做的方式是DexClassLoader和Reflection。
如果您需要更多详情，请与我们联系。这是它的目的：
来源：
Sample file loading Java method from TerminalIDE Android App