MainActivity.java

Question

我有一个Android应用程序，显示一个标志和一组单选按钮，每次用户检查任何单选按钮时，应用程序将显示一个按钮，允许使用意图转到下一页。

我需要的是每次用户检查正确的答案时，系统必须计算其分数，直到申请完成。得分将从0/0开始，并将在四轮结束后完成。

目前我只想在第二页显示用户的分数

我将不胜感激任何帮助

MainActivity.java

package com.devleb.flagology;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;
import android.widget.Toast;

public class MainActivity extends Activity {

    Button btnS;
    RadioGroup rdgS;
    RadioButton rdS1, rdS2, rdS3, rdS4;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        rdgS = (RadioGroup) findViewById(R.id.rdg1);
        rdgS.setOnCheckedChangeListener(new OnCheckedChangeListener() {

            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                // TODO Auto-generated method stub
                 if(rdS1.isChecked()||rdS2.isChecked()||rdS3.isChecked()||rdS4.isChecked()){
                     btnS.setVisibility(View.VISIBLE);

                 }
            }
        });

        rdS1 = (RadioButton) findViewById(R.id.rd_s1);
        rdS2 = (RadioButton) findViewById(R.id.rd_s2);
        rdS3 = (RadioButton) findViewById(R.id.rd_s3);
        rdS4 = (RadioButton) findViewById(R.id.rd_s4);

        btnS = (Button) findViewById(R.id.btn_s);
        btnS.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub

                String input;
                String result = null;
                Double dbl;

                Intent i = new Intent(MainActivity.this, SecondActivity.class);
               switch (v.getId()) {
            case R.id.rd_s1:
                input = rdS1.getText().toString();
                dbl  = Double.parseDouble(input);

                i.putExtra("score", 0);
                break;
            case R.id.rd_s2:
                i.putExtra("score", 0);
                break;
            case R.id.rd_s3:
                i.putExtra("score", 25);
                break;
            case R.id.rd_s4:
                i.putExtra("score", 0);
                break;

            default:
                break;
            }
                startActivity(i);

            }
        });



    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // TODO Auto-generated method stub
        switch (item.getItemId()) {
        case R.id.hint_icon:
            ShowAlertDialog();
            break;
        case R.id.about_icon:
            Toast.makeText(this, "developed by Georges Matta",
                    Toast.LENGTH_SHORT).show();
        default:
            break;
        }

        return super.onOptionsItemSelected(item);
    }

    public void ShowAlertDialog() {

        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle("Hint")
                .setMessage("The famouse sport is Bullfighting")
                .setCancelable(false)
                .setNegativeButton("OK", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int id) {
                        dialog.cancel();
                    }
                });
        AlertDialog alert = builder.create();
        alert.show();
    }

}

已编辑的代码

rdS1 = (RadioButton) findViewById(R.id.rd_s1);
        rdS2 = (RadioButton) findViewById(R.id.rd_s2);
        rdS3 = (RadioButton) findViewById(R.id.rd_s3);
        rdS4 = (RadioButton) findViewById(R.id.rd_s4);

        btnS = (Button) findViewById(R.id.btn_s);
        btnS.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub

                String input;
                String result = null;
                Double dbl;

                Intent i = new Intent(MainActivity.this, SecondActivity.class);
                switch (rdgS.getCheckedRadioButtonId()) {
                case R.id.rd_s1:
                    input = rdS1.getText().toString();
                    dbl = Double.parseDouble(input);
                    result = String.valueOf(dbl);

                    i.putExtra("score", result);
                    break;

activity_main.xml中

<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:background="@drawable/background"
    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=".MainActivity" >

    <ImageView
        android:id="@+id/imageView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginTop="34dp"
        android:src="@drawable/spanish" />

    <TextView
        android:id="@+id/textView1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/imageView1"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true"
        android:text="Gess the Country of the flag"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:textColor="#CCFF99" />

    <RadioGroup
        android:id="@+id/rdg1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_below="@+id/imageView1" >

        <RadioButton
            android:id="@+id/rd_s1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:checked="true"
            android:text="Egypt"
            android:textColor="#CCFF99" />

        <RadioButton
            android:id="@+id/rd_s2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="China"
            android:textColor="#CCFF99" />

        <RadioButton
            android:id="@+id/rd_s3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Spanish"
            android:textColor="#CCFF99" />

        <RadioButton
            android:id="@+id/rd_s4"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignRight="@+id/radioGroup1"
            android:layout_below="@+id/radioGroup1"
            android:text="Italy"
            android:textColor="#CCFF99" />
    </RadioGroup>

    <Button
        android:id="@+id/btn_s"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignRight="@+id/rdg1"
        android:layout_below="@+id/rdg1"
        android:text="Next"
        android:visibility="invisible" />

</RelativeLayout>

SecondActivity.java

package com.devleb.flagology;



import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.widget.TextView;

public class SecondActivity extends Activity {

    TextView txt_result;

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

        txt_result = (TextView) findViewById(R.id.txtResult);

        Bundle extras = getIntent().getExtras();
        if (extras != null) {
            String value = extras.getString("score");
            txt_result.setText(value);
        }

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.second, menu);
        return true;
    }

}

activity_second.xml

<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=".SecondActivity" >

    <TextView
        android:id="@+id/txtResult"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</RelativeLayout>

Answer 1

这里有一个问题：

        Intent intent = new Intent(MainActivity.this, SecondPage.class);
        intent.putExtra("showResult", result);
        startActivity(intent);

这应匹配第二个活动中的extras.getString("score");字符串，因此请将其更改为：

        Intent intent = new Intent(MainActivity.this, SecondPage.class);
        intent.putExtra("score", result);
        startActivity(intent);

Answer 2

在onClick(View v)处理程序中，v引用按钮btn_s，因此switch (v.getId())将无效，因为v.getId()将始终返回按钮的ID，即R.id.btn_s。

您需要单独查询单选按钮的状态，例如使用

if (rdS1.isChecked()) {
    // first ratio button is checked
} else if (rdS2.isChecked()) {
    // second is checked
} else if ...

将switch (v.getId())中的onClick(View v)替换为if。

Answer 3

简单的解决方案是修改您的switch案例，如下所示：

...
Intent i = new Intent(MainActivity.this, SecondActivity.class);
switch (rdgS.getCheckedRadioButtonId()) {
    case R.id.rd_s1:
        input = rdS1.getText().toString();
        dbl  = Double.parseDouble(input);

        i.putExtra("score", 0);
        break;
    case R.id.rd_s2:
        i.putExtra("score", 0);
        break;
    case R.id.rd_s3:
        i.putExtra("score", 25);
        break;
    case R.id.rd_s4:
        i.putExtra("score", 0);
        break;

    default:
        break;
}

startActivity(i);
...
...

此后，由于您传递了int个值，因此应使用getInt()方法。在SecondActivity的创建中执行此操作：

Bundle extras = getIntent().getExtras();
if (extras != null) {
    String value = String.valueOf(extras.getInt("score"));
    txt_result.setText(value);
}

检查是否选中了正确的radioButton并计算得分

MainActivity.java

已编辑的代码

activity_main.xml中

SecondActivity.java

activity_second.xml

3 个答案: