找不到资源 TextView [英] Resource not found TextView

问题描述

我在 Android 中迈出了第一步，并从一个非常简单的应用开始，它通过编织图案跟踪进度并显示相关行的说明.

I am taking my first steps in Android and am starting with a very simple app which keeps track of progress through a knitting pattern and shows the instructions for the relevant row.

我想以编程方式更新几个 TextView 对象.但是，使用 getViewById() 似乎无法正确识别它们并且应用程序崩溃.

I want to update a couple of TextView objects programmatically. However, using getViewById() does not seem to identify them properly and the app crashes.

在 Google 上搜索后，布局 XML 中的 XML 命名空间似乎有时存在问题，但我的看起来还不错.可能与范围有关吗?

Having searched on Google it seems there are sometimes problems with the XML namespace in the layout XML but mine looks OK. Is it something to do with scope, perhaps?

instructions.java(这是唯一的活动)

package uk.co.oketchup.blanketsquare;

import android.app.Activity;
import android.os.Bundle;
import android.content.SharedPreferences;
import android.widget.Button;
import android.widget.TextView;
import android.view.View.OnClickListener;
import android.view.View;

public class instructions extends Activity
{
    private int mRow;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);

        /* retrieve row from shared preferences, or start from zero if nothing there */
        SharedPreferences settings = getPreferences(MODE_PRIVATE);
        mRow = settings.getInt("row",0);

        setContentView(R.layout.main);

        /* associate onClick listeners with the two buttons */
        final Button btnIncrement = (Button) findViewById(R.id.increment);
        btnIncrement.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
                // Increment row
                ++mRow;
                calcAndUpdate();
            }
        });

        final Button btnDecrement = (Button) findViewById(R.id.decrement);
        btnDecrement.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
                // Decrement row
                --mRow;
                calcAndUpdate();
            }
        });
    }

  private void calcAndUpdate() {
    String Instructions;
    int knit1;
    int knit2;
    int remaining;

    if (mRow%2 == 1 )
      {
        /* Odd row */
        knit1 = 40 - mRow;
        Instructions = "K" + knit1;
        remaining = knit1;
      }
      else
      {
        /* Even row */
        knit1 = 18 - mRow/2;
        knit2 = knit1 + 1;
        Instructions = "Sl 1, k" + knit1 + ", [sl 1 kwise] 2 times, k1, p2sso, k" + knit2;
        remaining = knit1 + knit2 + 2;
      }

    /* Update the display */
    TextView tRow = (TextView) findViewById(R.id.row);
    TextView tInstr = (TextView) findViewById(R.id.instr);
    TextView tStRem = (TextView) findViewById(R.id.stitchremain);

    /* Set the text */
    tRow.setText(mRow);
    tInstr.setText(Instructions);
    tStRem.setText(remaining);

  }

}

/res/layout/ma​​in.xml

/res/layout/main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
  <TextView  
      android:id="@+id/row"
      android:layout_width="fill_parent" 
      android:layout_height="wrap_content" 
      android:text="Row"
      />
  <TextView  
      android:id="@+id/instr" 
      android:layout_width="fill_parent" 
      android:layout_height="wrap_content" 
      android:text="Instructions"
      android:layout_below="@id/row"
      />
  <Button
      android:id="@+id/increment"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="+"
      android:layout_alignParentBottom="true" />
  <Button
      android:id="@+id/decrement"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="-"
      android:layout_toRightOf="@id/increment"
      android:layout_alignParentBottom="true" />
  <TextView  
      android:id="@+id/stitchremain" 
      android:layout_width="fill_parent" 
      android:layout_height="wrap_content" 
      android:text="stitches remaining"
      android:layout_above="@id/increment"
      />
</RelativeLayout>

TextView 对象似乎已经注册好，因为它们出现在 R.java

The TextView objects seem to have been registered ok as they appear in R.java

public static final class id {
    public static final int decrement=0x7f050003;
    public static final int increment=0x7f050002;
    public static final int instr=0x7f050001;
    public static final int row=0x7f050000;
    public static final int stitchremain=0x7f050004;
}

这是 ddms 中显示的错误消息.

Here is the error message shown in ddms.

Uncaught handler: thread main exiting due to uncaught exception
android.content.res.Resources$NotFoundException: String resource ID #0x1
    at android.content.res.Resources.getText(Resources.java:200)
    at android.widget.TextView.setText(TextView.java:2813)
    at uk.co.oketchup.blanketsquare.instructions.calcAndUpdate(instructions.java:75)
    at uk.co.oketchup.blanketsquare.instructions.access$100(instructions.java:11)
    at uk.co.oketchup.blanketsquare.instructions$1.onClick(instructions.java:33)
[etc]

非常感谢您的帮助.

推荐答案

mRow 是一个整数.当您在第 75 行调用 setText(mRow) 时，它认为您正在尝试使用 ID = mRow 的值的 String 资源设置文本.

mRow is an integer. When you call setText(mRow) on line 75, it thinks that you are trying to set the text with a String resource with ID = the value of mRow.

改为:

tRow.setText(Integer.toString(mRow));

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