直接修改dex破解

一．编写一个简单的验证程序

(1)MainActivity：

 protected void onCreate(BundlesavedInstanceState) {

               super.onCreate(savedInstanceState);

               setContentView(R.layout.activity_main);

               Buttonbutton ;

               finalEditText text1,text2;

               button=(Button)findViewById(R.id.button1);

               //获取两个输入框的数据

               text1= (EditText)findViewById(R.id.editText1);

               text2=(EditText)findViewById(R.id.editText2);

               button.setOnClickListener(newOnClickListener() {

               @Override

               public void onClick(View v) {

               //TODO Auto-generated method stub

               //对输入框的书进行判断

                 if(text1.getText().toString().equals("CHINA")&&text2.getText().toString().equals("")){

                         StringcontentToShow = "Hi,"+text1.getText().toString();

                         Toast.makeText(MainActivity.this,contentToShow,Toast.LENGTH_LONG).show();

                 }else{

                      StringcontentToShow = "NO."+text1.getText().toString()+"it isincorrect";

                      Toast.makeText(MainActivity.this,contentToShow,Toast.LENGTH_LONG).show();

              }

       }

   });

 }

(2)activity_main.xml

<RelativeLayoutxmlns:android="http://schemas.android.com/apk/res/android"

   xmlns:tools="http://schemas.android.com/tools"

   android:layout_width="match_parent"

   android:layout_height="match_parent"

   android:paddingBottom="@dimen/activity_vertical_margin"

   android:paddingLeft="@dimen/activity_horizontal_margin"

   android:paddingRight="@dimen/activity_horizontal_margin"

   android:paddingTop="@dimen/activity_vertical_margin"

   tools:context="com.example.toast.MainActivity" >

   <Button

        android:id="@+id/button1"

       android:layout_width="wrap_content"

       android:layout_height="wrap_content"

       android:layout_alignLeft="@+id/editText1"

       android:layout_alignParentTop="true"

        android:layout_marginLeft="63dp"

       android:layout_marginTop="204dp"

        android:text="点击" />

   <TextView

        android:id="@+id/textView2"

       android:layout_width="wrap_content"

       android:layout_height="wrap_content"

        android:layout_alignParentTop="true"

       android:layout_marginRight="22dp"

       android:layout_marginTop="44dp"

       android:layout_toLeftOf="@+id/editText1"

        android:text="请输入：" />

   <EditText

        android:id="@+id/editText1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignParentRight="true"

        android:layout_alignTop="@+id/textView2"

        android:layout_marginRight="61dp"

        android:ems="" />

   <TextView

        android:id="@+id/textView1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignParentLeft="true"

        android:layout_below="@+id/editText1"

        android:layout_marginTop="65dp"

        android:text="数字密码：" />

   <EditText

          android:id="@+id/editText2"

          android:layout_width="wrap_content"

          android:layout_height="wrap_content"

          android:layout_alignLeft="@+id/editText1"

          android:layout_alignTop="@+id/textView1"

          android:ems=""

          android:inputType="numberPassword" >

        <requestFocus />

   </EditText>

</RelativeLayout>