setText 无法在 TextView 中将数字显示为文本 [英] setText fails to show a number as text in a TextView

问题描述

我有 4 个按钮和 1 个 TextView.我希望每个按钮从 TextView 中的值(解析为 int)中添加或减去不同的数量.当我单击其中一个按钮时，它会引发致命错误(如下所列).我搜索了一些其他 Stackoverflow 讨论，但似乎没有任何效果.这是我目前的活动:

I have 4 buttons and 1 TextView. I want each of the buttons to add or subtract a different amount from the value (parsed to int) in the TextView. When I click on one of the buttons it throws fatal errors (listed below). I've searched some other Stackoverflow discussions and nothing seems to be working. Here is my current activity:

public class PaydownSnowball extends Activity {
int aAmt;
String debtExtraPayment;

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

    final Button plusTen = (Button) findViewById(R.id.buttonp10);
    final Button plusFive = (Button) findViewById(R.id.buttonp5);
    final Button minusFive = (Button) findViewById(R.id.buttonm5);
    final Button minusTen = (Button) findViewById(R.id.buttonm10);

    SharedPreferences sharedPref= getSharedPreferences("chaosdatasnowball", 0);
    debtExtraPayment = sharedPref.getString("debtExtraPayment", null);
    debtExtraPayment ="0";
    TextView addAmount = (TextView) findViewById(R.id.dispAddAmt);
    addAmount.setText(debtExtraPayment);
    aAmt = Integer.parseInt(debtExtraPayment);


    plusTen.setOnClickListener(new OnClickListener() {
        public void onClick(View v) {
          aAmt = aAmt + 10;
          TextView addAmount = (TextView) findViewById(R.id.dispAddAmt);
          addAmount.setText(aAmt);
        }
      });
    plusFive.setOnClickListener(new OnClickListener() {
        public void onClick(View v) {
          aAmt = aAmt + 5;
          TextView addAmount = (TextView) findViewById(R.id.dispAddAmt);
          addAmount.setText(aAmt);
        }
      });
    minusTen.setOnClickListener(new OnClickListener() {
        public void onClick(View v) {
          aAmt = aAmt - 10;
          TextView addAmount = (TextView) findViewById(R.id.dispAddAmt);
          addAmount.setText(aAmt);
        }
      });
    minusFive.setOnClickListener(new OnClickListener() {
        public void onClick(View v) {
          aAmt = aAmt - 5;
          TextView addAmount = (TextView) findViewById(R.id.dispAddAmt);
          addAmount.setText(aAmt);
        }
      });


    debtExtraPayment = String.valueOf(aAmt);
    addAmount.setText(debtExtraPayment);

    SharedPreferences.Editor editor= sharedPref.edit();
    editor.putString("debtExtraPayment", debtExtraPayment).commit();
}

以下是点击 plusFive 按钮时出现的 logcat:

Here are the logcats that occur on click of the plusFive button:

11-09 15:15:57.907: E/AndroidRuntime(695): FATAL EXCEPTION: main
11-09 15:15:57.907: E/AndroidRuntime(695): android.content.res.Resources$NotFoundException: String resource ID #0x5
11-09 15:15:57.907: E/AndroidRuntime(695):  at android.content.res.Resources.getText(Resources.java:201)
11-09 15:15:57.907: E/AndroidRuntime(695):  at android.widget.TextView.setText(TextView.java:2817)
11-09 15:15:57.907: E/AndroidRuntime(695):  at biz.midl.debtsnowball.PaydownSnowball$2.onClick(PaydownSnowball.java:47)
11-09 15:15:57.907: E/AndroidRuntime(695):  at android.view.View.performClick(View.java:2408)
11-09 15:15:57.907: E/AndroidRuntime(695):  at android.view.View$PerformClick.run(View.java:8816)
11-09 15:15:57.907: E/AndroidRuntime(695):  at android.os.Handler.handleCallback(Handler.java:587)
11-09 15:15:57.907: E/AndroidRuntime(695):  at android.os.Handler.dispatchMessage(Handler.java:92)
11-09 15:15:57.907: E/AndroidRuntime(695):  at android.os.Looper.loop(Looper.java:123)
11-09 15:15:57.907: E/AndroidRuntime(695):  at android.app.ActivityThread.main(ActivityThread.java:4627)
11-09 15:15:57.907: E/AndroidRuntime(695):  at java.lang.reflect.Method.invokeNative(Native Method)
11-09 15:15:57.907: E/AndroidRuntime(695):  at java.lang.reflect.Method.invoke(Method.java:521)
11-09 15:15:57.907: E/AndroidRuntime(695):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
11-09 15:15:57.907: E/AndroidRuntime(695):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
11-09 15:15:57.907: E/AndroidRuntime(695):  at dalvik.system.NativeStart.main(Native Method)
11-09 15:15:59.467: I/Process(695): Sending signal. PID: 695 SIG: 9

推荐答案

问题是这样的行

addAmount.setText(aAmt);

其中 aAmt 是 int.这将查找具有 id 的 aAmt 的 resource.您需要先将其转换为 String 像

where aAmt is an int. This looks for a resource with the id of whatever aAmt is. You need to cast it to a String first like

addAmount.setText(String.valueOf(aAmt));

有重载的 setText() 方法.查看文档

这篇文章详细介绍了它的实际工作原理

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