Android運行時錯誤使用OnTouchListenner

Question

我要求用戶觸摸TextView1，並需要打印他在TextView2上觸摸的'x'軸位置。但是，每當我輕觸TextView1，我的應用 「無奈停止」 在一種與設備 這-testing是類：第三部分

import android.app.Activity; 
import android.content.Intent; 
import android.os.Bundle; 
import android.view.MotionEvent; 
import android.view.View; 
import android.widget.TextView; 
public class Part3 extends Activity implements View.OnTouchListener{ 
    private TextView txtView1; 
    private TextView txtView2; 
    float x,y; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_part3); 
     txtView1=(TextView)findViewById(R.id.Part3_txtView1); 
     txtView2=(TextView)findViewById(R.id.Part3_txtView2); 
     x=0;y=0; 
     this.txtView1.setOnTouchListener(this); 
    } 

    @Override 
    public boolean onTouch(View v, MotionEvent event) { 
     if (v.getId()==R.id.Part3_txtView1){ 
      x= event.getX(); 
      y= event.getY(); 
      txtView2.setText((int)x); 
      return true; 
     } 
     return false; 
    }} 

這是activity_part3：

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:gravity="center_horizontal" 
    android:orientation="vertical" > 

    <TextView 
     android:id="@+id/Part3_txtView1" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:padding="30dp" 
     android:text="@string/Part3_s1" 
     android:textSize="20sp" /> 

    <TextView 
     android:id="@+id/Part3_txtView2" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="x" /> 

</LinearLayout> 

和logcat的：

09-29 15:14:27.043: W/dalvikvm(8454): threadid=1: thread exiting with uncaught exception (group=0x2b542210) 
09-29 15:14:27.063: E/AndroidRuntime(8454): FATAL EXCEPTION: main 
09-29 15:14:27.063: E/AndroidRuntime(8454): android.content.res.Resources$NotFoundException: String resource ID #0x121 
09-29 15:14:27.063: E/AndroidRuntime(8454):  at android.content.res.Resources.getText(Resources.java:247) 
09-29 15:14:27.063: E/AndroidRuntime(8454):  at android.widget.TextView.setText(TextView.java:3495) 
09-29 15:14:27.063: E/AndroidRuntime(8454):  at bnabaei.touchrecorder.Part3.onTouch(Part3.java:36) 
09-29 15:14:27.063: E/AndroidRuntime(8454):  at android.view.View.dispatchTouchEvent(View.java:5559) 
09-29 15:14:27.063: E/AndroidRuntime(8454):  at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2058) 
09-29 15:14:27.063: E/AndroidRuntime(8454):  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1785) 
09-29 15:14:27.063: E/AndroidRuntime(8454):  at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2058) 
09-29 15:14:27.063: E/AndroidRuntime(8454):  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1785) 
09-29 15:14:27.063: E/AndroidRuntime(8454):  at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2058) 
09-29 15:14:27.063: E/AndroidRuntime(8454):  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1785) 
09-29 15:14:27.063: E/AndroidRuntime(8454):  at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2058) 
09-29 15:14:27.063: E/AndroidRuntime(8454):  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1785) 
09-29 15:14:27.063: E/AndroidRuntime(8454):  at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1931) 
09-29 15:14:27.063: E/AndroidRuntime(8454):  at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1390) 
09-29 15:14:27.063: E/AndroidRuntime(8454):  at android.app.Activity.dispatchTouchEvent(Activity.java:2364) 
09-29 15:14:27.063: E/AndroidRuntime(8454):  at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1879) 
09-29 15:14:27.063: E/AndroidRuntime(8454):  at android.view.View.dispatchPointerEvent(View.java:5766) 
09-29 15:14:27.063: E/AndroidRuntime(8454):  at android.view.ViewRootImpl.deliverPointerEvent(ViewRootImpl.java:2890) 
09-29 15:14:27.063: E/AndroidRuntime(8454):  at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2466) 
09-29 15:14:27.063: E/AndroidRuntime(8454):  at android.view.ViewRootImpl.processInputEvents(ViewRootImpl.java:845) 
09-29 15:14:27.063: E/AndroidRuntime(8454):  at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2475) 
09-29 15:14:27.063: E/AndroidRuntime(8454):  at android.os.Handler.dispatchMessage(Handler.java:99) 
09-29 15:14:27.063: E/AndroidRuntime(8454):  at android.os.Looper.loop(Looper.java:137) 
09-29 15:14:27.063: E/AndroidRuntime(8454):  at android.app.ActivityThread.main(ActivityThread.java:4441) 
09-29 15:14:27.063: E/AndroidRuntime(8454):  at java.lang.reflect.Method.invokeNative(Native Method) 
09-29 15:14:27.063: E/AndroidRuntime(8454):  at java.lang.reflect.Method.invoke(Method.java:511) 
09-29 15:14:27.063: E/AndroidRuntime(8454):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 
09-29 15:14:27.063: E/AndroidRuntime(8454):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 
09-29 15:14:27.063: E/AndroidRuntime(8454):  at dalvik.system.NativeStart.main(Native Method) 

Answer 1

Android Docs for TextView#setText(int)狀態，它會尋找一個字符串資源設置爲文本，那麼，你說

x= event.getX(); 
y= event.getY(); 
txtView2.setText((int)x); 

該系統尋找資源與資源ID x

你應該以該值設置爲TextView

textView2.setText(String.valueOf(x));