setText 无法在 TextView 中将数字显示为文本

Question

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）。我搜索了其他一些 Stackoverflow 讨论，但似乎没有任何效果。这是我目前的活动：

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：

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

Answer 1

问题在于这样的行

addAmount.setText(aAmt);

其中aAmt 是int。这将查找带有 id 的 resource 和 aAmt 的任何 aAmt。您需要先将其转换为String

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

有重载的setText() 方法。 See the docs

This post goes into some more detail as to how this actually works

Answer 2

您可以尝试以下两种方法之一：

1. addAmount.setText("" + aAmt);
2. addAmount.setText(String.valueOf(aAmt));

你会得到一个没有任何错误的字符串结果。