如何在一个活动中处理两种布局上的小部件

Question

我有以下代码要执行的操作：单击sigup textview时，它应该显示第二个布局，该布局是相对布局顶部的linearlayout。 到目前为止，它正在工作。 接下来，当我在第二个屏幕上单击“允许”按钮时，我想显示带有注册详细信息的另一种布局，但是这没有发生。 xml文件已附加。

    package care.e_eyepewsversion2;

public class MainActivity extends AppCompatActivity {


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button login = (Button) findViewById(R.id.loginbutton);
        TextView signup= (TextView) findViewById(R.id.signup);

        EditText email1 = (EditText) findViewById(R.id.Email);
        EditText password1 = (EditText) findViewById(R.id.Password);


        if (signup != null) {
            signup.setOnClickListener(new TextView.OnClickListener(){
                public void onClick(View V){
                    Button login = (Button) findViewById(R.id.loginbutton);
                    login.setVisibility(View.INVISIBLE);
                    LinearLayout adminacesslayout= (LinearLayout) findViewById(R.id.adminaccesslayout) ;
                    int visibility = adminacesslayout.getVisibility();

                    if(visibility==View.GONE)
                    {adminacesslayout.setVisibility(View.VISIBLE);}
                }
            }
            );
        }

        LinearLayout adminacesslayout= (LinearLayout) findViewById(R.id.adminaccesslayout) ;
        int visibility1=adminacesslayout.getVisibility();
        if(visibility1==View.VISIBLE)
        {

            Button adminlogin = (Button) findViewById(R.id.adminpassbutton);

            if (adminlogin != null) {
               adminlogin.setOnClickListener(new Button.OnClickListener(){
                 public void onClick(View V){
                     EditText adminpass= (EditText) findViewById(R.id.admiinpass);
                     String adminpasswordtyped= adminpass.getText().toString();

                 //       if("1234".equals(adminpasswordtyped))
                //        {   LinearLayout adminacesslayout= (LinearLayout) findViewById(R.id.adminaccesslayout) ;
                //            adminacesslayout.setVisibility(View.GONE);
                //        }
                       RelativeLayout signuplayout= (RelativeLayout) findViewById(R.id.signup_layout);
                      int visibility2=signuplayout.getVisibility();
                      if(visibility2==View.GONE)
                   {
                       LinearLayout adminacesslayout= (LinearLayout) findViewById(R.id.adminaccesslayout) ;
                       adminacesslayout.setVisibility(View.GONE);
                       signuplayout.setVisibility(View.VISIBLE);
                   }


                   }

                }

                );
           }
        }



        login.setOnClickListener(new Button.OnClickListener() {
                                     public void onClick(View V) {
                                         checkdetails();
                                     }

                                 }
        );
    }

    public void checkdetails() {
        EditText email = (EditText) findViewById(R.id.Email);
        EditText password = (EditText) findViewById(R.id.Password);
        String emailtyped = email.getText().toString();
        String passwordtyped = password.getText().toString();
        String filename = "my file";


        //Writing to file section
        String string = "Hello world!";
        FileOutputStream outputStream;

        try {
            outputStream = openFileOutput(filename, Context.MODE_PRIVATE);
            outputStream.write(emailtyped.getBytes());
            outputStream.write("\r\n".getBytes());
            outputStream.write(passwordtyped.getBytes());
            outputStream.close();
            Context context = getApplicationContext();
            CharSequence text = "Login history Saved";
            int duration = Toast.LENGTH_SHORT;

            Toast toast = Toast.makeText(context, text, duration);
            toast.show();
        } catch (Exception e) {
            e.printStackTrace();
        }


        //Reading from file section Text

        if (getString(R.string.firstemailtyped).equals(emailtyped)) {
            if ("1234".equals(passwordtyped)) {
                Button loogin = (Button) findViewById(R.id.loginbutton);
                TextView dummydata= (TextView) findViewById(R.id.dummydata);


               // After that, you can call read method to read one character at a time from the file and then you can print it. Its syntax is given below −

                try {
                    InputStream inputStream = openFileInput("my file");

                    if (inputStream != null) {
                        InputStreamReader streamReader = new InputStreamReader(inputStream);
                        BufferedReader bufferedReader = new BufferedReader(streamReader);

                        String l;
                        String k="";

                        while (( l = bufferedReader.readLine()) != null) {
                            // do what you want with the line
                            k=(k+l);
                            dummydata.setText(k);
                        }

                    }

                    inputStream.close(); //close the file
                } catch (IOException e) {
                    e.printStackTrace();
                }


            }
        }
    }
}

xml文件

 <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns: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="care.e_eyepewsversion2.MainActivity">

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/log_in"
        android:id="@+id/loginbutton"
        android:layout_marginBottom="166dp"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:textColor="@color/login_but_text_clr"
        android:background="@color/login_button_clr"
        android:visibility="visible"
        />

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/imageView"
        android:layout_alignParentEnd="true"
        android:src="@drawable/carelogo"
        android:layout_centerHorizontal="true"
        android:layout_alignParentBottom="true"
        android:layout_alignParentStart="true" />

    <EditText
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:inputType="textEmailAddress"
        android:ems="10"
        android:id="@+id/Email"
        android:layout_above="@+id/loginbutton"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="110dp"
        android:visibility="visible"/>

    <EditText
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:inputType="textPassword"
        android:ems="10"
        android:id="@+id/Password"
        android:layout_above="@+id/loginbutton"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="40dp"
        android:visibility="visible" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:text="E-EYE Platoon Early Warning System"
        android:textAlignment="center"
        android:textColor="@color/Email_password_text"
        android:textAllCaps="true"
        android:textStyle="bold"
        android:id="@+id/textView"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:text="Email"
        android:id="@+id/textView2"
        android:layout_marginRight="30dp"
        android:textSize="15sp"
        android:textColor="@color/Email_password_text"
        android:layout_alignBottom="@+id/Email"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:text="Password"
        android:textSize="15dp"
        android:textColor="@color/Email_password_text"
        android:id="@+id/textView3"
        android:layout_alignBottom="@+id/Password"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true" />



    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text=""
        android:id="@+id/dummydata"
        android:layout_above="@+id/imageView"
        android:layout_centerHorizontal="true" />
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:text= "Sign Up?"
        android:textSize="20sp"
        android:textStyle="italic"
        android:textColor="@color/login_button_clr"
        android:textColorHint="@color/Email_password_text"
        android:id="@+id/signup"
        android:layout_alignBottom="@+id/loginbutton"
        />

    <LinearLayout
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="200dp"
        android:layout_centerHorizontal="true"
        android:layout_alignBottom="@+id/loginbutton"
        android:background="#539c65"
        android:id="@+id/adminaccesslayout"
        android:visibility="gone">
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="20dp"
            android:text="ADMINISTRATOR PERMISSION REQUIRED"
            android:textColor="#F00000"
            android:textStyle="bold"
            android:textSize="20sp"
            android:textAlignment="center"/>
        <EditText
            android:layout_width="200dp"
            android:layout_height="wrap_content"
            android:layout_gravity="center_horizontal"
            android:id="@+id/admiinpass"/>
        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="#70FFFFFF"
            android:text="ALLOW"
            android:textStyle="bold"
            android:textColor="#FFFFFF"
            android:layout_gravity="center_horizontal"
            android:id="@+id/adminpassbutton" />
</LinearLayout>

<RelativeLayout
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#00bfff"
    android:id="@+id/signup_layout"
    android:visibility="gone">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Signup Details"
        android:textAllCaps="true"
        android:textSize="30sp"
        android:textColor="#006400"
        android:layout_centerHorizontal="true"/>

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Name"
        android:layout_toStartOf="@+id/newusername"
        android:layout_marginTop="50dp"
        android:textSize="20sp"
        android:layout_alignBottom="@+id/newusername" />

    <EditText
        android:layout_width="190dp"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:id="@+id/newusername"
        android:layout_marginTop="50dp"
        android:textAllCaps="true"
        />
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Email"
        android:layout_toStartOf="@+id/newemail"
        android:textSize="20sp"
        android:layout_alignBottom="@+id/newemail" />

    <EditText
        android:layout_width="190dp"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:id="@+id/newemail"
        android:layout_below="@id/newusername"
        android:layout_marginTop="50dp"
        android:textAllCaps="true"
        />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Password"
        android:layout_toStartOf="@+id/newpassword"
        android:textSize="18sp"
        android:layout_alignBottom="@+id/newpassword" />

    <EditText
        android:layout_width="190dp"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:id="@+id/newpassword"
        android:layout_below="@id/newemail"
        android:layout_marginTop="50dp"
        />
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/newpassword"
        android:layout_marginTop="50dp"
        android:layout_centerHorizontal="true"
        android:background="#8050"
        android:text="SIGN UP"
        android:textColor="#FFFFFF"
        android:id="@+id/signupbutton"/>


</RelativeLayout>

</RelativeLayout>

Answer 1

一次调用onCreate方法。

因此，当在创建Activity期间执行它时，它会发现if(visibility1==View.VISIBLE)不是true（因为adminacesslayout visibility GONE ）。

这样，您就不会膨胀adminlogin ，也不会在其上设置任何Button.OnClickListener 。

您需要的是：

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.test);
        Button login = (Button) findViewById(R.id.loginbutton);
        TextView signup = (TextView) findViewById(R.id.signup);

        EditText email1 = (EditText) findViewById(R.id.Email);
        EditText password1 = (EditText) findViewById(R.id.Password);


        if (signup != null) {
            signup.setOnClickListener(new TextView.OnClickListener() {
                                          public void onClick(View V) {
                                              showAdminacesslayout();

                                          }
                                      }
            );
        }

        LinearLayout adminacesslayout = (LinearLayout) findViewById(R.id.adminaccesslayout);
        int visibility1 = adminacesslayout.getVisibility(); //        if(visibility1==View.VISIBLE) //        { // //            Button
adminlogin = (Button) findViewById(R.id.adminpassbutton); // //     
if (adminlogin != null) { //               
adminlogin.setOnClickListener(new Button.OnClickListener(){ //      
public void onClick(View V){ //                                     
EditText adminpass= (EditText) findViewById(R.id.admiinpass); //    
String adminpasswordtyped= adminpass.getText().toString(); // //    
//       if("1234".equals(adminpasswordtyped)) //                   
//        {   LinearLayout adminacesslayout= (LinearLayout)
findViewById(R.id.adminaccesslayout) ; //                           
//            adminacesslayout.setVisibility(View.GONE); //         
//        } //                                                     
RelativeLayout signuplayout= (RelativeLayout)
findViewById(R.id.signup_layout); //                                
int visibility2=signuplayout.getVisibility(); //                    
if(visibility2==View.GONE) //                                       
{ //                                                         
LinearLayout adminacesslayout= (LinearLayout)
findViewById(R.id.adminaccesslayout) ; //                           
adminacesslayout.setVisibility(View.GONE); //                       
signuplayout.setVisibility(View.VISIBLE); //                        
} // // //                                                  } // // 
} // //                ); //            } //        }


        login.setOnClickListener(new Button.OnClickListener() {
                                     public void onClick(View V) {
                                         checkdetails();
                                     }

                                 }
        );
    }

    private void showAdminacesslayout() {

        Button login = (Button) findViewById(R.id.loginbutton);
        login.setVisibility(View.INVISIBLE);
        LinearLayout adminacesslayout = (LinearLayout) findViewById(R.id.adminaccesslayout);
        int visibility = adminacesslayout.getVisibility();

        if (visibility == View.GONE) {
            adminacesslayout.setVisibility(View.VISIBLE);
        }

        Button adminlogin = (Button) findViewById(R.id.adminpassbutton);

        if (adminlogin != null) {
            adminlogin.setOnClickListener(new Button.OnClickListener() {
                                              public void onClick(View V) {
                                                  EditText adminpass = (EditText) findViewById(R.id.admiinpass);
                                                  String adminpasswordtyped = adminpass.getText().toString();

                                                  //       if("1234".equals(adminpasswordtyped))
                                                  //        {   LinearLayout adminacesslayout= (LinearLayout)
findViewById(R.id.adminaccesslayout) ;
                                                  //            adminacesslayout.setVisibility(View.GONE);
                                                  //        }
                                                  RelativeLayout signuplayout = (RelativeLayout) findViewById(R.id.signup_layout);
                                                  int visibility2 = signuplayout.getVisibility();
                                                  if (visibility2 == View.GONE) {
                                                      LinearLayout adminacesslayout = (LinearLayout)
findViewById(R.id.adminaccesslayout);
                                                      adminacesslayout.setVisibility(View.GONE);
                                                      signuplayout.setVisibility(View.VISIBLE);
                                                  }


                                              }

                                          }

            );
        }
    }

    public void checkdetails() {
        EditText email = (EditText) findViewById(R.id.Email);
        EditText password = (EditText) findViewById(R.id.Password);
        String emailtyped = email.getText().toString();
        String passwordtyped = password.getText().toString();
        String filename = "my file";


        //Writing to file section
        String string = "Hello world!";
        FileOutputStream outputStream;

        try {
            outputStream = openFileOutput(filename, Context.MODE_PRIVATE);
            outputStream.write(emailtyped.getBytes());
            outputStream.write("\r\n".getBytes());
            outputStream.write(passwordtyped.getBytes());
            outputStream.close();
            Context context = getApplicationContext();
            CharSequence text = "Login history Saved";
            int duration = Toast.LENGTH_SHORT;

            Toast toast = Toast.makeText(context, text, duration);
            toast.show();
        } catch (Exception e) {
            e.printStackTrace();
        }


        //Reading from file section Text

        if ("ciao".equals(emailtyped)) { //        if (getString(R.string.firstemailtyped).equals(emailtyped)) {
            if ("1234".equals(passwordtyped)) {
                Button loogin = (Button) findViewById(R.id.loginbutton);
                TextView dummydata = (TextView) findViewById(R.id.dummydata);


                // After that, you can call read method to read one character at a time from the file and then you can print it. Its
syntax is given below −

                try {
                    InputStream inputStream = openFileInput("my file");

                    if (inputStream != null) {
                        InputStreamReader streamReader = new InputStreamReader(inputStream);
                        BufferedReader bufferedReader = new BufferedReader(streamReader);

                        String l;
                        String k = "";

                        while ((l = bufferedReader.readLine()) != null) {
                            // do what you want with the line
                            k = (k + l);
                            dummydata.setText(k);
                        }

                    }

                    inputStream.close(); //close the file
                } catch (IOException e) {
                    e.printStackTrace();
                }


            }
        }
    }


}

或者更简单地说，您只能删除这些行，并将代码放在方括号之间：

int visibility1 = adminacesslayout.getVisibility();
if(visibility1==View.VISIBLE)
{

 ...

}