當我按下按鈕時，我的應用程序總是崩潰，我的簡單Android應用程序崩潰時增加整數

Question

。我是Android新手，你能幫助我嗎？

當用戶按下按鈕時，應該增加一個int值，然後將其顯示在textView中。

activity_main.xml中

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:orientation="horizontal" > 

    <Button 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:onClick="sendMessage" 
     android:text="@string/button_send" /> 

    <TextView 
     android:id="@+id/text" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_centerHorizontal="true" 
     android:layout_centerVertical="true" 
     android:text="@string/text" 
     android:textSize="30sp" 
     tools:context=".DisplayMessageActivity" /> 

    <!-- android:visibility="invisible" --> 

    <TextView 
     android:id="@+id/val" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_below="@+id/text" 
     android:layout_centerHorizontal="true" 
     android:layout_marginTop="37dp" 
     android:text="   " /> 

</RelativeLayout> 

MainActivity.java

package com.example.myfirstapp; 

import android.os.Bundle; 
import android.app.Activity; 
import android.content.Intent; 
import android.view.Menu; 
import android.view.View; 
import android.widget.EditText; 
import android.widget.TextView; 

public class MainActivity extends Activity { 
    public final static String EXTRA_MESSAGE = "com.example.myfirstapp.MESSAGE"; 
    public int mult = 1; 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
    } 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     getMenuInflater().inflate(R.menu.activity_main, menu); 
     return true; 
    } 

    /** Called when the user clicks on the Send button */ 
    public void sendMessage(View view) 
    { 
     //Intent intent = new Intent(this, DisplayMessageActivity.class); 
     //TextView text = (TextView) findViewById(R.id.text); 

     TextView val = (TextView) findViewById(R.id.val); 
     val.setText(mult); 
     mult+=1; 
     //EditText editText = (EditText) findViewById(R.id.edit_message); 
     //String message = editText.getText().toString(); 
     //intent.putExtra(EXTRA_MESSAGE, message); 
     //startActivity(intent); 
    } 
} 

這裏是崩潰日誌

11-07 14:23:05.663: I/Choreographer(1126): Skipped 32 frames! The application may be doing too much work on its main thread. 
11-07 14:23:05.898: D/gralloc_goldfish(1126): Emulator without GPU emulation detected. 
11-07 14:23:10.543: I/Choreographer(1126): Skipped 51 frames! The application may be doing too much work on its main thread. 
11-07 14:23:11.076: W/ResourceType(1126): No package identifier when getting value for resource number 0x00000001 
11-07 14:23:11.083: D/AndroidRuntime(1126): Shutting down VM 
11-07 14:23:11.083: W/dalvikvm(1126): threadid=1: thread exiting with uncaught exception (group=0x40a13300) 
11-07 14:23:11.263: E/AndroidRuntime(1126): FATAL EXCEPTION: main 
11-07 14:23:11.263: E/AndroidRuntime(1126): java.lang.IllegalStateException: Could not execute method of the activity 
11-07 14:23:11.263: E/AndroidRuntime(1126):  at android.view.View$1.onClick(View.java:3591) 
11-07 14:23:11.263: E/AndroidRuntime(1126):  at android.view.View.performClick(View.java:4084) 
11-07 14:23:11.263: E/AndroidRuntime(1126):  at android.view.View$PerformClick.run(View.java:16966) 
11-07 14:23:11.263: E/AndroidRuntime(1126):  at android.os.Handler.handleCallback(Handler.java:615) 
11-07 14:23:11.263: E/AndroidRuntime(1126):  at android.os.Handler.dispatchMessage(Handler.java:92) 
11-07 14:23:11.263: E/AndroidRuntime(1126):  at android.os.Looper.loop(Looper.java:137) 
11-07 14:23:11.263: E/AndroidRuntime(1126):  at android.app.ActivityThread.main(ActivityThread.java:4745) 
11-07 14:23:11.263: E/AndroidRuntime(1126):  at java.lang.reflect.Method.invokeNative(Native Method) 
11-07 14:23:11.263: E/AndroidRuntime(1126):  at java.lang.reflect.Method.invoke(Method.java:511) 
11-07 14:23:11.263: E/AndroidRuntime(1126):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 
11-07 14:23:11.263: E/AndroidRuntime(1126):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 
11-07 14:23:11.263: E/AndroidRuntime(1126):  at dalvik.system.NativeStart.main(Native Method) 
11-07 14:23:11.263: E/AndroidRuntime(1126): Caused by: java.lang.reflect.InvocationTargetException 
11-07 14:23:11.263: E/AndroidRuntime(1126):  at java.lang.reflect.Method.invokeNative(Native Method) 
11-07 14:23:11.263: E/AndroidRuntime(1126):  at java.lang.reflect.Method.invoke(Method.java:511) 
11-07 14:23:11.263: E/AndroidRuntime(1126):  at android.view.View$1.onClick(View.java:3586) 
11-07 14:23:11.263: E/AndroidRuntime(1126):  ... 11 more 
11-07 14:23:11.263: E/AndroidRuntime(1126): Caused by: android.content.res.Resources$NotFoundException: String resource ID #0x1 
11-07 14:23:11.263: E/AndroidRuntime(1126):  at android.content.res.Resources.getText(Resources.java:229) 
11-07 14:23:11.263: E/AndroidRuntime(1126):  at android.widget.TextView.setText(TextView.java:3620) 
11-07 14:23:11.263: E/AndroidRuntime(1126):  at com.example.myfirstapp.MainActivity.sendMessage(MainActivity.java:34) 
11-07 14:23:11.263: E/AndroidRuntime(1126):  ... 14 more 
11-07 14:23:15.013: I/Process(1126): Sending signal. PID: 1126 SIG: 9 

Answer 1

相信的setText方法查找資源，如果你在一個int通過。在使用setText之前，您需要將變量mult更改爲String。以下任一操作將工作：

val.setText("" + mult); 

或者

val.setText(Integer.toString(mult)); 

Answer 2

你不能設置一個文本視圖爲int的內容。相反，你必須將其更改爲一個字符串第一

替換行

val.setText(mult); 

隨着

val.setText(Integer.toString(mult));