android - 卡在执行按钮

Question

我是 java 的新手(主要是与嵌入式决斗)

我正在编写一个简单的 android 程序，通过单击按钮将 editText 输入的值传递给另一个 editText。但是，每次我按下按钮时，我的程序都会崩溃。想要任何人评论:)

这是我的主要内容:

package Mushroom.Pickers.Note;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
//import android.widget.Button;
//import android.widget.TableLayout;

public class Mushy extends Activity {
//private TableLayout layout;
//private Button button;

/** Called when the activity is first created. */

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

public void Compute_data(View view) {//Function to perform on click
     //Perform calculation      
     int Hours;
     EditText start_time = (EditText)findViewById(R.id.editText26) ;
     Hours = Integer.parseInt(start_time.getText().toString());     

     EditText test_time = (EditText)findViewById(R.id.editText43);
     test_time.setText(Hours);

 }  
}

在我的 xml 中:

<Button
        android:id="@+id/Button1"
        android:layout_width="134px"
        android:layout_height="wrap_content"
        android:gravity="center_vertical|center_horizontal"
        android:textSize="15sp"
        android:text="Calculate"
        android:onClick="Compute_data" 
        android:textColor="#1e90ff" />
</TableRow>
<EditText
        android:id="@+id/editText26"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="center_vertical|center_horizontal"
        android:inputType="number"
        android:width="350px" />

<EditText
        android:id="@+id/editText43"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="center_vertical|center_horizontal"
        android:inputType="number"
        android:width="350px" />

布局看起来很好，只是点击按钮时崩溃的问题:(

P/S:这是日志:

12-19 03:03:02.106: W/ResourceType(667): No package identifier when getting value for resource number 0x00000004
12-19 03:03:02.106: D/AndroidRuntime(667): Shutting down VM
12-19 03:03:02.106: W/dalvikvm(667): threadid=1: thread exiting with uncaught exception (group=0x409961f8)
12-19 03:03:02.275: E/AndroidRuntime(667): FATAL EXCEPTION: main
12-19 03:03:02.275: E/AndroidRuntime(667): java.lang.IllegalStateException: Could not execute method of the activity
12-19 03:03:02.275: E/AndroidRuntime(667):  at android.view.View$1.onClick(View.java:3039)
12-19 03:03:02.275: E/AndroidRuntime(667):  at android.view.View.performClick(View.java:3480)
12-19 03:03:02.275: E/AndroidRuntime(667):  at android.view.View$PerformClick.run(View.java:13983)
12-19 03:03:02.275: E/AndroidRuntime(667):  at android.os.Handler.handleCallback(Handler.java:605)
12-19 03:03:02.275: E/AndroidRuntime(667):  at android.os.Handler.dispatchMessage(Handler.java:92)
12-19 03:03:02.275: E/AndroidRuntime(667):  at android.os.Looper.loop(Looper.java:137)
12-19 03:03:02.275: E/AndroidRuntime(667):  at android.app.ActivityThread.main(ActivityThread.java:4340)
12-19 03:03:02.275: E/AndroidRuntime(667):  at java.lang.reflect.Method.invokeNative(Native Method)
12-19 03:03:02.275: E/AndroidRuntime(667):  at java.lang.reflect.Method.invoke(Method.java:511)
12-19 03:03:02.275: E/AndroidRuntime(667):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
12-19 03:03:02.275: E/AndroidRuntime(667):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
12-19 03:03:02.275: E/AndroidRuntime(667):  at dalvik.system.NativeStart.main(Native Method)
12-19 03:03:02.275: E/AndroidRuntime(667): Caused by: java.lang.reflect.InvocationTargetException
12-19 03:03:02.275: E/AndroidRuntime(667):  at java.lang.reflect.Method.invokeNative(Native Method)
12-19 03:03:02.275: E/AndroidRuntime(667):  at java.lang.reflect.Method.invoke(Method.java:511)
12-19 03:03:02.275: E/AndroidRuntime(667):  at android.view.View$1.onClick(View.java:3034)
12-19 03:03:02.275: E/AndroidRuntime(667):  ... 11 more
12-19 03:03:02.275: E/AndroidRuntime(667): Caused by: android.content.res.Resources$NotFoundException: String resource ID #0x4
12-19 03:03:02.275: E/AndroidRuntime(667):  at android.content.res.Resources.getText(Resources.java:247)
12-19 03:03:02.275: E/AndroidRuntime(667):  at android.widget.TextView.setText(TextView.java:3428)
12-19 03:03:02.275: E/AndroidRuntime(667):  at Mushroom.Pickers.Note.Mushy.Compute_data(Mushy.java:29)
12-19 03:03:02.275: E/AndroidRuntime(667):  ... 14 more
12-19 03:03:02.475: D/dalvikvm(667): GC_CONCURRENT freed 230K, 4% free 10426K/10759K, paused 6ms+14ms

Answer 1

问题:

test_time.setText(value) 覆盖了 int 和 String 参数的方法。

• int 参数表示您将传递String 资源id。 (IE R.string.any_string)
• String参数表示你将传递String。

您将 Hours 作为 int 而不是 String 传递。

解决方案:

您会将 int 转换为 String 以设置为任何 View 的文本(即 Button、TextView、EditText) 修改您的代码如下:

public void Compute_data(View view) {
     //....
     //here is rest of your code
     EditText test_time = (EditText)findViewById(R.id.editText43);
     test_time.setText(String.valueOf(Hours));//<<<------consider this change
}