A useful library provides some operations doing on .dex file

Download

Please use JitPack.

allprojects {
    repositories {
        ...
        maven { url "https://jitpack.io" }
    }
}

compile 'com.github.zjutkz:Dexer:1.3'

Usage

You should decode the .dex file first.Just construct the Dexer class

public void decode_dex(View view){
    try {
        byte[] src = stream2byte(getAssets().open("classes.dex"));
        dexer = new Dexer(src);
    } catch (IOException e) {
        e.printStackTrace();
    }
}

public Dexer(File file){
    this(file.getAbsolutePath());
}

public Dexer(String dexPath){
    this(FileUtil.getBytes(dexPath));
}

public Dexer(byte[] src){
    initThread();
    decodeDex(src);
}

There are 6 functions support here:

1.Getting all classes in .dex file:

public void get_all_classes(View view){
        dexer.getAllClasses(new Dexer.OnFetchDataListener<List<Class>>() {
            @Override
            public void onFetchDataSuccess(List<Class> data) {
                for(Class clz : data){
                    Log.d(TAG, clz.source_file_name);
                }
            }
        });
}

2.Getting all methods in .dex file:

public void get_all_methods(View view){
        dexer.getAllMethods(new Dexer.OnFetchDataListener<List<Method>>() {
            @Override
            public void onFetchDataSuccess(List<Method> data) {
                for(Method method : data){
                    Log.d(TAG, method.name);
                }
            }
        });
}

3.Getting all methods in a specific class:

public void get_all_methods_in_class(View view){
        dexer.getAllMethodsInClass("MainActivity",new Dexer.OnFetchDataListener() {
            @Override
            public void onFetchDataSuccess(Object data) {
                List<Method> allMethods = (List<Method>)data;
                for(Method method : allMethods){
                    Log.d(TAG, method.name);
                }
            }
        });
}

4.Judging if this .dex file has a particular class or method:

public void has_method_and_class(View view){
        dexer.hasClass("MainActivity", new Dexer.OnFetchDataListener<Boolean>() {
            @Override
            public void onFetchDataSuccess(Boolean data) {
                Log.d(TAG, "dex file has MainActivity: " + (boolean)data);
            }
        });

        dexer.hasClass("MainActivity2", new Dexer.OnFetchDataListener<Boolean>() {
            @Override
            public void onFetchDataSuccess(Boolean data) {
                Log.d(TAG, "dex file has MainActivity2: " + data);
            }
        });

        dexer.hasMethods("MainActivity", "get_all_methods_in_class", new Dexer.OnFetchDataListener<Boolean>() {
            @Override
            public void onFetchDataSuccess(Boolean data) {
                Log.d(TAG, "MainActivity has method get_all_methods_in_class: " + data);
            }
        });

        dexer.hasMethods("MainActivity", "get_all_methods_in_class2", new Dexer.OnFetchDataListener<Boolean>() {
            @Override
            public void onFetchDataSuccess(Boolean data) {
                Log.d(TAG, "MainActivity has method get_all_methods_in_class2: " + data);
            }
        });
}

5.Getting a specific class(support inner class):

public void get_class(View view){
        dexer.getClass("TestClass", new Dexer.OnFetchDataListener<Class>() {
            @Override
            public void onFetchDataSuccess(Class data) {
                Log.d(TAG, data.class_name + " " + data.super_class_name);
                for(Field field : data.instance_fields){
                    Log.d(TAG, "instance field: " + field.name + " " + field.access_flag);
                }
                for(Field field : data.static_fields){
                    Log.d(TAG, "static field: " + field.name + " " + field.access_flag);
                }
                Log.d(TAG, "" + data.access_flags);
                Log.d(TAG, "=========================================");
            }
        });

        dexer.getClass("TestClass$InnerClass", new Dexer.OnFetchDataListener<Class>() {
            @Override
            public void onFetchDataSuccess(Class data) {
                for(Field field : data.instance_fields){
                    Log.d(TAG, "instance field: " + field.name);
                }
                for(Field field : data.static_fields){
                    Log.d(TAG, "static field: " + field.name);
                }
                Log.d(TAG, "" + data.access_flags);
                Log.d(TAG, "=========================================");
            }
        });

        dexer.getClass("TestClass$InnerClass$DoubleInnerClass", new Dexer.OnFetchDataListener<Class>() {
            @Override
            public void onFetchDataSuccess(Class data) {
                for(Field field : data.instance_fields){
                    Log.d(TAG, "instance field: " + field.name);
                }
                for(Field field : data.static_fields){
                    Log.d(TAG, "static field: " + field.name);
                }
                Log.d(TAG, "" + data.access_flags);
                Log.d(TAG, "=========================================");
            }
        });
}

6.Getting a specific method:

public void get_method(View view){
        dexer.getMethod("MainActivity", "onCreate", new Dexer.OnFetchDataListener<Method>() {
            @Override
            public void onFetchDataSuccess(Method data) {
                Log.d(TAG, data.name);
                Log.d(TAG, "" + data.access_flag);
                Log.d(TAG, data.returnType);
                for(String type : data.paramTypes){
                    Log.d(TAG, type);
                }
                for(Annotation annotation : data.methodAnnotations){
                    Log.d(TAG, annotation.name);
                    for(AnnotationElement element : annotation.elements){
                        Log.d(TAG, element.name + ": " + element.value);
                    }
                }
            }
        });
}

7.Dumpping the dex:

7.1 In logcat

public void dump(View view){
    dexer.dumpDex();
}

7.2 In file

public void dump(View view){
    dexer.dumpDex("storage/sdcard0/dump.txt");
}

8.Getting methods & classes count:

public void get_count(View view){
        dexer.getClassCount(new Dexer.OnFetchDataListener<Integer>() {
            @Override
            public void onFetchDataSuccess(Integer data) {
                Log.d(TAG, "classes count: " + data);
            }
        });

        dexer.getMethodCount(new Dexer.OnFetchDataListener<Integer>() {
            @Override
            public void onFetchDataSuccess(Integer data) {
                Log.d(TAG, "methods count: " + data);
            }
        });
}

Todo

1.Support the code item

2.Support array-type annotation value

Thanks

dex2jar

License

Copyright 2016 zjutkz

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.