我如何让这个程序从5个TextView值计算总数？

Question

一旦用户从下拉框中选择食物名称，我试图让我的程序正确显示卡路里的总量。它将显示每个食物名称右侧的卡路里量。但是，单击总按钮后，在底部，我希望它在文本视图区域中显示金额。现在，当我点击总按钮时，整个应用程序崩溃（没有给出错误消息）。任何有关这方面的帮助将不胜感激。我觉得有更好的方法可以做我想做的事情，但我实施的方法是我知道的唯一方法。似乎无法在网上找到任何其他内容。我的代码：

public class CalorieTracker extends ActionBarActivity implements AdapterView.OnItemSelectedListener {
    TextView sp1;
    TextView sp2;
    TextView sp3;
    TextView sp4;
    TextView sp5;
    Spinner spinner1;
    Spinner spinner2;
    Spinner spinner3;
    Spinner spinner4;
    Spinner spinner5;
    int total;
    TextView caloriesNum;
    List<String> foods = new ArrayList<String>();
    List<String> calories = new ArrayList<String>();

    int Cal1;
    int Cal2;
    int Cal3;
    int Cal4;
    int Cal5;

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

        spinner1 = (Spinner) findViewById(R.id.spinner1);
        spinner2 = (Spinner) findViewById(R.id.spinner2);
        spinner3 = (Spinner) findViewById(R.id.spinner3);
        spinner4 = (Spinner) findViewById(R.id.spinner4);
        spinner5 = (Spinner) findViewById(R.id.spinner5);

        sp1 = (TextView) findViewById(R.id.spinner1TextView);
        sp2 = (TextView) findViewById(R.id.spinner2TextView);
        sp3 = (TextView) findViewById(R.id.spinner3TextView);
        sp4 = (TextView) findViewById(R.id.spinner4TextView);
        sp5 = (TextView) findViewById(R.id.spinner5TextView);
        caloriesNum = (TextView) findViewById(R.id.caloriesNumbers);

        populateSpinner();
        ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this,
                R.array.foods_array, android.R.layout.simple_spinner_item);
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

        spinner1.setOnItemSelectedListener(this);
        spinner2.setOnItemSelectedListener(this);
        spinner3.setOnItemSelectedListener(this);
        spinner4.setOnItemSelectedListener(this);
        spinner5.setOnItemSelectedListener(this);
    }

    public void populateSpinner() {
        foods.add("");
        foods.add("Chicken");
        foods.add("Pizza");
        foods.add("Eggs");
        foods.add("Spaghetti");
        foods.add("Salad");
        foods.add("Ice Cream");
        foods.add("Bacon");
        foods.add("Banana");
        foods.add("Bagel");
        foods.add("Beef Roast");

        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, foods);
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        spinner1.setAdapter(adapter);
        spinner2.setAdapter(adapter);
        spinner3.setAdapter(adapter);
        spinner4.setAdapter(adapter);
        spinner5.setAdapter(adapter);

        calories.add("0");
        calories.add("300");
        calories.add("365");
        calories.add("70");
        calories.add("325");
        calories.add("105");
        calories.add("340");
        calories.add("90");
        calories.add("60");
        calories.add("75");
        calories.add("315");
    }

    public void addCalories(View v) {
        Cal1 = Integer.parseInt(sp1.getText().toString());
        Cal2 = Integer.parseInt(sp2.getText().toString());
        Cal3 = Integer.parseInt(sp3.getText().toString());
        Cal4 = Integer.parseInt(sp4.getText().toString());
        Cal5 = Integer.parseInt(sp5.getText().toString());

        total = Cal1 + Cal2 + Cal3 + Cal4 + Cal5;
        caloriesNum.setText(total);
    }


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

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        int id = item.getItemId();

        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }

    @Override
    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
        switch (parent.getId()) {
            case R.id.spinner1:
                String strCal1 = calories.get(position).toString();
                sp1.setText(strCal1);
                break;
            case R.id.spinner2:
                String strCal2 = calories.get(position).toString();
                sp2.setText(strCal2);
                break;
            case R.id.spinner3:
                String strCal3 = calories.get(position).toString();
                sp3.setText(strCal3);
                break;
            case R.id.spinner4:
                String strCal4 = calories.get(position).toString();
                sp4.setText(strCal4);
                break;
            case R.id.spinner5:
                String strCal5 = calories.get(position).toString();
                sp5.setText(strCal5);
                break;
        }

    }

    @Override
    public void onNothingSelected(AdapterView<?> parent) {
    }
} 

<Spinner
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/spinner1"
    android:layout_alignParentTop="true"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true" />

<Spinner
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/spinner2"
    android:layout_below="@+id/spinner1"
    android:layout_marginTop="25dp"
    android:layout_alignParentLeft="true"
    />

<Spinner
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/spinner3"
    android:layout_below="@+id/spinner2"
    android:layout_marginTop="25dp"
    android:layout_alignParentLeft="true"
    />

<Spinner
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/spinner4"
    android:layout_below="@+id/spinner3"
    android:layout_marginTop="25dp"
    android:layout_alignParentLeft="true"
    />

<Spinner
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/spinner5"
    android:layout_below="@+id/spinner4"
    android:layout_alignParentLeft="true"
    android:layout_marginTop="25dp"
    />

<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Save"
    android:id="@+id/saveButton"
    android:layout_alignTop="@+id/backButton"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true"
    android:layout_marginLeft="30dp"
    android:layout_marginStart="30dp"
    android:layout_marginRight="10dp"
    android:background="#ff00cc27" />

<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Back"
    android:id="@+id/backButton"
    android:layout_marginRight="10dp"
    android:layout_marginBottom="32dp"
    android:layout_alignParentBottom="true"
    android:layout_toRightOf="@+id/saveButton"
    android:layout_toEndOf="@+id/saveButton" />

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceMedium"
    android:text="Total Calories:"
    android:id="@+id/totalCaloriesTextView"
    android:layout_marginBottom="42dp"
    android:layout_above="@+id/saveButton"
    android:layout_alignLeft="@+id/saveButton"
    android:layout_alignStart="@+id/saveButton" />

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceMedium"
    android:text="0"
    android:id="@+id/caloriesNumbers"
    android:layout_alignTop="@+id/totalCaloriesTextView"
    android:layout_toRightOf="@+id/totalCaloriesTextView"
    android:layout_toEndOf="@+id/totalCaloriesTextView" />

<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Total"
    android:layout_marginRight="10dp"
    android:onClick="addCalories"
    android:id="@+id/totalButton"
    android:layout_alignTop="@+id/backButton"
    android:layout_toRightOf="@+id/backButton"
    android:layout_toEndOf="@+id/backButton" />

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceMedium"
    android:text="Calories"
    android:layout_alignParentTop="true"
    android:layout_alignParentRight="true"
    android:layout_marginRight="30dp"
    android:id="@+id/spinner1TextView"
    android:layout_alignRight="@+id/totalButton"
    android:layout_alignEnd="@+id/totalButton" />

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceMedium"
    android:text="Calories"
    android:layout_marginTop="25dp"
    android:layout_alignParentRight="true"
    android:layout_marginRight="30dp"
    android:id="@+id/spinner2TextView"
    android:layout_below="@+id/spinner1TextView"
    android:layout_alignRight="@+id/spinner1TextView"
    android:layout_alignEnd="@+id/spinner1TextView" />

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceMedium"
    android:text="Calories"
    android:id="@+id/spinner3TextView"
    android:layout_marginTop="25dp"
    android:layout_marginRight="30dp"
    android:layout_alignParentRight="true"
    android:layout_below="@+id/spinner2TextView"
    android:layout_alignRight="@+id/spinner2TextView"
    android:layout_alignEnd="@+id/spinner2TextView" />

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceMedium"
    android:text="Calories"
    android:layout_marginTop="25dp"
    android:layout_marginRight="30dp"
    android:layout_alignParentRight="true"
    android:id="@+id/spinner4TextView"
    android:layout_below="@+id/spinner3TextView"
    android:layout_alignRight="@+id/spinner3TextView"
    android:layout_alignEnd="@+id/spinner3TextView" />

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceMedium"
    android:text="Calories"
    android:layout_marginTop="25dp"
    android:layout_marginRight="30dp"
    android:id="@+id/spinner5TextView"
    android:layout_below="@+id/spinner4TextView"
    android:layout_alignParentRight="true"
    android:layout_alignRight="@+id/spinner4TextView"
    android:layout_alignEnd="@+id/spinner4TextView" />

logcat的：

java.lang.IllegalStateException: Could not execute method of the activity
            at android.view.View$1.onClick(View.java:4007)
            at android.view.View.performClick(View.java:4756)
            at android.view.View$PerformClick.run(View.java:19749)
            at android.os.Handler.handleCallback(Handler.java:739)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:135)
            at android.app.ActivityThread.main(ActivityThread.java:5221)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
     Caused by: java.lang.reflect.InvocationTargetException
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at android.view.View$1.onClick(View.java:4002)
            at android.view.View.performClick(View.java:4756)
            at android.view.View$PerformClick.run(View.java:19749)
            at android.os.Handler.handleCallback(Handler.java:739)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:135)
            at android.app.ActivityThread.main(ActivityThread.java:5221)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
     Caused by: android.content.res.Resources$NotFoundException: String resource ID #0x384
            at android.content.res.Resources.getText(Resources.java:274)
            at android.widget.TextView.setText(TextView.java:4122)
            at buckystutorial.foodsspinneritems.CalorieTracker.addCalories(CalorieTracker.java:127)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at android.view.View$1.onClick(View.java:4002)
            at android.view.View.performClick(View.java:4756)
            at android.view.View$PerformClick.run(View.java:19749)
            at android.os.Handler.handleCallback(Handler.java:739)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:135)
            at android.app.ActivityThread.main(ActivityThread.java:5221)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)

Answer 1

从

更改方法的签名

public void addCalories()

到

public void addCalories(View v)

此外，理解为什么你无法读取logcat是非常重要的 - 如果没有它，你将无法正常进行。