我如何将两个活动从我的代码转换为两个片段

Question

我需要将代码中的两个活动转换为两个片段。

这些是要求：

1. 将有一个应用程序活动在顶部显示通用徽标图像。 锁定应用程序以仅以纵向模式显示。

2. 创建两个片段，一个用于数据输入，另一个用于贷款摘要显示。 每个片段都将直接附加到徽标图像下方的应用程序活动，由操作栏中的选项控制。 操作栏中将有两个选项卡：汽车购买和贷款摘要。 选择了汽车购买时，应显示数据输入的片段。 选择贷款摘要时，应显示根据当前购买数据计算的贷款明细。

请以任何方式提供帮助。

Activity1 (LoanSummaryActivity.java)

    package com.cornez.autopurchase;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;

public class LoanSummaryActivity extends Activity {

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.loansummary_layout);
    TextView monthlyPayET = (TextView) findViewById(R.id.textView2);
    TextView loanReportET = (TextView) findViewById(R.id.textView3);

    // PASS DATA
    Intent intent = getIntent();

    String report;
    report = intent.getStringExtra("LoanReport");

    String monthlyPay;
    monthlyPay = intent.getStringExtra("MonthlyPayment");
    monthlyPayET.setText(monthlyPay);
    loanReportET.setText(report);
}

public void goDataEntry(View view) {
    finish();
}
}

Activity2 (PurchaseActivity.java)

    package com.cornez.autopurchase;

public class PurchaseActivity extends Activity {
// THE AUTO OBJECT CONTAINS THE INFORMATION ABOUT THE VEHICLE BEING      PURCHASED
Auto mAuto;

// THE DATA TO BE PASSED TO THE LOAN ACTIVITY
String loanReport;
String monthlyPayment;

// LAYOUT INPUT REFERENCES
private EditText carPriceET;
private EditText downPayET;
private RadioGroup loanTermRG;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.purchase_layout);

    //ESTABLISH REFERENCES TO EDITABLE TEXT FIELDS AND RADIO BUTTON
    carPriceET = (EditText) findViewById(R.id.editText1);
    downPayET = (EditText) findViewById(R.id.editText2);
    loanTermRG = (RadioGroup) findViewById(R.id.radioGroup1);

    //CREATE AN AUTOMOBILE OBJECT TO STORE AUTO DATA
    mAuto = new Auto();
}

private void collectAutoInputData() {
    // TASK 1: SET THE CAR PRICE
    mAuto.setPrice ((double) Integer.valueOf(carPriceET.getText()
            .toString()));

    //TASK 2: SET THE DOWN PAYMENT
    mAuto.setDownPayment((double)
            Integer.valueOf(downPayET.getText()
                    .toString()));

    //TASK 3 SET THE LOAN TERM
    Integer radioId = loanTermRG.getCheckedRadioButtonId();
    RadioButton term = (RadioButton) findViewById(radioId);
    mAuto.setLoanTerm(term.getText().toString());
}
private void buildLoanReport() {
    // TASK 1: CONSTRUCT THE MONTHLY PAYMENT
    Resources res = getResources();
    monthlyPayment = res.getString(R.string.report_line1)
            + String.format("%.02f", mAuto.monthlyPayment());


    // TASK 2: CONSTRUCT THE LOAN REPORT
    loanReport = res.getString(R.string.report_line6)
            + String.format("%10.02f", mAuto.getPrice());
    loanReport += res.getString(R.string.report_line7)
            + String.format("%10.02f", mAuto.getDownPayment());

    loanReport += res.getString(R.string.report_line9)
            + String.format("%18.02f", mAuto.taxAmount());
    loanReport += res.getString(R.string.report_line10)
            + String.format("%18.02f", mAuto.totalCost());
    loanReport += res.getString(R.string.report_line11)
            + String.format("%12.02f", mAuto.borrowedAmount());
    loanReport += res.getString(R.string.report_line12)
            + String.format("%12.02f", mAuto.interestAmount());

    loanReport += "\n\n" + res.getString(R.string.report_line8) + " " +                                 mAuto.getLoanTerm() + " years.";

    loanReport += "\n\n" + res.getString(R.string.report_line2);
    loanReport += res.getString(R.string.report_line3);
    loanReport += res.getString(R.string.report_line4);
    loanReport += res.getString(R.string.report_line5);

}

public void activateLoanSummary(View view) {
    //TASK 1: BUILD A LOAN REPORT FROM THE INPUT DATA
    collectAutoInputData();
    buildLoanReport();

    //TASK 2: CREATE AN INTENT TO DISPLAY THE LOAN SUMMARY ACTIVITY
    Intent launchReport = new Intent(this, LoanSummaryActivity.class);

    //TASK 3: PASS THE LOAN SUMMARY ACTIVITY TWO PIECES OF DATA:
    //     THE LOAN REPORT CONTAINING LOAN DETAILS
    //     THE MONTHLY PAYMENT
    launchReport.putExtra("LoanReport", loanReport);
    launchReport.putExtra("MonthlyPayment", monthlyPayment);

    //TASK 4: START THE LOAN ACTIVITY
    startActivity(launchReport);
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu;
    getMenuInflater().inflate(R.menu.my, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();
    if (id == R.id.action_settings) {
        return true;
    }
    return super.onOptionsItemSelected(item);
}
}

贷款摘要_布局.xml

    <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin">

<!-- LOGO AND INSTRUCTION SECTION -->
<ImageView
    android:id="@+id/imageView1"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentTop="true"
    android:layout_centerHorizontal="true"
    android:contentDescription="@string/title_activity_main"
    android:src="@drawable/logo" />

<TextView
    android:id="@+id/textView1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignLeft="@+id/imageView1"
    android:layout_alignRight="@+id/imageView1"
    android:layout_below="@+id/imageView1"
    android:background="@color/steel_blue"
    android:gravity="center_horizontal"
    android:text="@string/loan_summary"
    android:textAppearance="?android:attr/textAppearanceMedium"
    android:textColor="#fff"
    android:textSize="12sp" />

<!-- TEXTVIEW HOLDING THE MONTHLY PAYMENT -->
<TextView
    android:id="@+id/textView2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignLeft="@+id/textView1"
    android:layout_alignRight="@+id/textView1"
    android:layout_below="@+id/textView1"
    android:layout_marginTop="2dp"
    android:textSize="18sp" />

<!-- TEXTVIEW HOLDING THE CAR LOAN SUMMARY -->
<TextView
    android:id="@+id/textView3"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignLeft="@+id/textView1"
    android:layout_alignRight="@+id/textView1"
    android:layout_below="@+id/textView2"
    android:layout_marginTop="2dp"
    android:textSize="16sp"
    android:typeface="monospace"
    android:paddingLeft="10dp"
    android:paddingRight="10dp" />

<Button
    android:id="@+id/button1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:layout_centerHorizontal="true"
    android:onClick="goDataEntry"
    android:text="@string/go_data_entry" />

</RelativeLayout>

购买布局.xml

    </RadioGroup>

<TextView
    android:id="@+id/textView6"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_below="@+id/radioGroup1"
    android:layout_centerHorizontal="true"
    android:text="@string/loan_term"
    android:textColor="@color/steel_blue"
    android:textSize="12sp"  />

<Button
    android:id="@+id/button1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:layout_centerHorizontal="true"
    android:text="@string/generate_btn"
    android:onClick="activateLoanSummary"/>

</RelativeLayout>

Answer 1

您需要的是Viewpager 。

请查看本教程http://www.truiton.com/2015/06/android-tabs-example-fragments-viewpager/

这符合你的目的。

了解更多关于ViewPager 。

Answer 2

以下是如何在 Activity 中使用片段以及如何切换它们的示例。

public class SignUpActivity extends AppCompatActivity {

            private FragmentManager fragmentManager;
            private Fragment switchFragment;

            @Override
            protected void onCreate(Bundle savedInstanceState) {
                super.onCreate(savedInstanceState);
                setContentView(R.layout.activity_sign_up);

                fragmentManager = getSupportFragmentManager();

                switchFragment nameFragment = new SignNameFragment();
                fragmentManager.beginTransaction()
                   .add(R.layout.activity_sign_up, switchFragment)
                   .commit();


            }

           public void cambiarFragment(){
                 switchFragment = new anyTypeFragment();
                 fragmentManager.beginTransaction()
                    .replace(R.layout.activity_sign_up, switchFragment)
                    .commit();
              }
    }

和 SignUpActivity.xml 文件：

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout 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:id="@+id/activity_sign_up">


</FrameLayout>

和 nameFragment 类：

public class nameFragment extends Fragment {

    private Button next;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //Inicializar Modelo
    }

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View v= inflater.inflate(R.layout.nameFragment_fragment_layout,container,false);    ///Cargar XML, Vista Padre, Si quiero dejarlo siempre

        next=(Button)v.findViewById(R.id.btn_crear_grupo);

        next.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {

                        ((SignUpActivity) getActivity()).cambiarFragment();
                    }


                }
            });



        return v;


    }
}

在那里你可以创建任何你想要的 Fragment 类。