android - java.lang.IllegalStateException : Could not execute method of the activity with Android 错误

Question

我是一个相当新的 Android 程序员，在学习了几个教程之后，我开始扩展我完成的 BMI 计算器教程。在此过程中，我有必要删除并重新安装 Eclipse。我还必须切换工作区。由于我的失误，我只能保留应用程序的 .java 文件。我重新创建了 .xml 和 list ，只是现在我在尝试单击计算按钮时收到 IllegalStateException。在切换和重新创建之前，一切运行良好。我正在使用运行 4.2.2 的 Nexus Galaxy 模拟器 这是代码:

package com.example.bmicalculator;

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

public class MainActivity extends Activity { ImageDownloader downloader;

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

}

public void calculateClickHandler(View view) {
  if(view.getId() == R.id.calculateButton) {
      EditText weightText = (EditText)findViewById(R.id.weightLabel);
      EditText heightText = (EditText)findViewById(R.id.heightText);
      TextView resultText = (TextView)findViewById(R.id.resultLabel);
      TextView suggestText= (TextView)findViewById(R.id.suggestedFix);
      ImageView image = (ImageView)findViewById(R.id.relatedPicture);
      float weight = Float.parseFloat(weightText.getText().toString());
      float height = Float.parseFloat(heightText.getText().toString());

      float bmiValue = calculateBMI(weight, height);

      String bmiInterpretation = interpretBMI(bmiValue);

      String suggest = "We suggest " + interpretBMIInterpretation(bmiInterpretation);

      resultText.setText(bmiValue + "-" + bmiInterpretation);
      suggestText.setText(suggest);
      setUpImage(image, bmiInterpretation);
  }
}

private float calculateBMI(float weight, float height) {
  return (float) (weight * 4.88 / (height * height));
}

private String interpretBMI(float bmiValue) {
  if(bmiValue < 16) {
      return "Severely underweight";
  } else if (bmiValue < 18.5) {
      return "Underweight";
  } else if(bmiValue < 25) {
      return "Normal";
  }
  else if(bmiValue < 30) {
      return "Overweight";
  }
  else {
      return "Obese";
  }
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}

private String interpretBMIInterpretation(String interp) {
  if(interp.equals("Severely underweight")) {
      return "eating more.  You can still work out and stay thin, but you need more weight.";
  }
  else if(interp.equals("Underweight")) {
      return "eating a little more, alongside working out to gain muscle weight.";
  }
  else if(interp.equals("Normal")) {
      return "continuing to do whatever it is you're doing.";
  }
  else if(interp.equals("Overweight")) {
      return "working out a little.  Lose a few fat poinds and put on some muscle pounds, and you'll be a healthy weight.";
  }
  else {
      return "cutting back on your food intake and working out.  A little goes a long way.";
  }
}

private void setUpImage(ImageView image, String interp) {
  if(interp.equals("Severely underweight")) {
      image.setVisibility(View.INVISIBLE);
      downloader = new ImageDownloader(image);
      String url = "http://www.wendys.com/cs/Satellite?blobcol=urldata&blobheader=image%2Fpng&blobkey=id&blobtable=MungoBlobs&blobwhere=1365660287009&ssbinary=true";
      downloader.execute(url);
  }
  else if(interp.equals("Underweight")) {
      image.setVisibility(View.INVISIBLE);
      downloader = new ImageDownloader(image);
      String url = "http://www.livestrongfitness.com/blog/wp-content/uploads/barbell.jpg";
      downloader.execute(url);
  }
  else if(interp.equals("Normal")) {
      image.setVisibility(View.INVISIBLE);
      downloader = new ImageDownloader(image);
      String url = "http://primary3.tv/blog/wp-content/uploads/2011/03/thumbsup.jpg";
      downloader.execute(url);
  }
  else if(interp.equals("Overweight")) {
      image.setVisibility(View.INVISIBLE);
      downloader = new ImageDownloader(image);
      String url = "http://www.livestrongfitness.com/blog/wp-content/uploads/barbell.jpg";
      downloader.execute(url);
  }
  else {
      image.setVisibility(View.INVISIBLE);
      downloader = new ImageDownloader(image);
      String url = "http://wisefitnesstips.com/wp-content/uploads/2013/02/salad-nutrients-facts.jpg";
      downloader.execute(url);
  }
}
 }

和 ImageDownload 类:

package com.example.bmicalculator;

import java.io.InputStream; import java.net.URL;

import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.os.AsyncTask; import android.view.View; import android.widget.ImageView; public class ImageDownloader extends AsyncTask { ImageView image; public ImageDownloader(ImageView image) { this.image = image; } protected Bitmap doInBackground(String... strings) { try { Bitmap bitmap = BitmapFactory.decodeStream((InputStream)new URL(strings[0]).getContent()); return bitmap; } catch (Exception e) { System.out.println("Error: " + e); return null; } }

protected void onProgressUpdate(Integer... progress) {

}

protected void onPostExecute(Bitmap result) {
  image.setImageBitmap(result);
  image.setVisibility(View.VISIBLE);
} }

还有 LogCat:

05-23 14:45:52.447: E/AndroidRuntime(1083): FATAL EXCEPTION: main 05-23 14:45:52.447: E/AndroidRuntime(1083): java.lang.IllegalStateException: Could not execute method of the activity 05-23 14:45:52.447: E/AndroidRuntime(1083): at android.view.View$1.onClick(View.java:3599) 05-23 14:45:52.447: E/AndroidRuntime(1083): at android.view.View.performClick(View.java:4204) 05-23 14:45:52.447: E/AndroidRuntime(1083): at android.view.View$PerformClick.run(View.java:17355) 05-23 14:45:52.447: E/AndroidRuntime(1083): at android.os.Handler.handleCallback(Handler.java:725) 05-23 14:45:52.447: E/AndroidRuntime(1083): at android.os.Handler.dispatchMessage(Handler.java:92) 05-23 14:45:52.447: E/AndroidRuntime(1083): at android.os.Looper.loop(Looper.java:137) 05-23 14:45:52.447: E/AndroidRuntime(1083): at android.app.ActivityThread.main(ActivityThread.java:5041) 05-23 14:45:52.447: E/AndroidRuntime(1083): at java.lang.reflect.Method.invokeNative(Native Method) 05-23 14:45:52.447: E/AndroidRuntime(1083): at java.lang.reflect.Method.invoke(Method.java:511) 05-23 14:45:52.447: E/AndroidRuntime(1083): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 05-23 14:45:52.447: E/AndroidRuntime(1083): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 05-23 14:45:52.447: E/AndroidRuntime(1083): at dalvik.system.NativeStart.main(Native Method) 05-23 14:45:52.447: E/AndroidRuntime(1083): Caused by: java.lang.reflect.InvocationTargetException 05-23 14:45:52.447: E/AndroidRuntime(1083): at java.lang.reflect.Method.invokeNative(Native Method) 05-23 14:45:52.447: E/AndroidRuntime(1083): at java.lang.reflect.Method.invoke(Method.java:511) 05-23 14:45:52.447: E/AndroidRuntime(1083): at android.view.View$1.onClick(View.java:3594) 05-23 14:45:52.447: E/AndroidRuntime(1083): ... 11 more 05-23 14:45:52.447: E/AndroidRuntime(1083): Caused by: java.lang.ClassCastException: android.widget.TextView cannot be cast to android.widget.EditText 05-23 14:45:52.447: E/AndroidRuntime(1083): at com.example.bmicalculator.MainActivity.calculateClickHandler(MainActivity.java:23) 05-23 14:45:52.447: E/AndroidRuntime(1083): ... 14 more 05-23 14:47:48.527: D/dalvikvm(1158): GC_CONCURRENT freed 55K, 7% free 2770K/2948K, paused 6ms+14ms, total 96ms 05-23 14:47:48.877: D/gralloc_goldfish(1158): Emulator without GPU emulation detected. 05-23 14:47:53.837: D/InputEventConsistencyVerifier(1158): KeyEvent: ACTION_UP but key was not down. 05-23 14:47:53.837: D/InputEventConsistencyVerifier(1158): in android.widget.EditText{40d2d8e8 VFED..CL .F....I. 32,209-452,288

7f080003 app:id/heightText} 05-23 14:47:53.837: D/InputEventConsistencyVerifier(1158): 0: sent at 922301000000,

KeyEvent { action=ACTION_UP, keyCode=KEYCODE_TAB, scanCode=15, metaState=0, flags=0x8, repeatCount=0, eventTime=922301, downTime=922168, deviceId=0, source=0x101 } 05-23 14:47:55.097: D/AndroidRuntime(1158): Shutting down VM 05-23 14:47:55.097: W/dalvikvm(1158): threadid=1: thread exiting with uncaught exception (group=0x40a71930) 05-23 14:47:55.187: E/AndroidRuntime(1158): FATAL EXCEPTION: main 05-23 14:47:55.187: E/AndroidRuntime(1158): java.lang.IllegalStateException: Could not execute method of the activity 05-23 14:47:55.187: E/AndroidRuntime(1158): at android.view.View$1.onClick(View.java:3599) 05-23 14:47:55.187: E/AndroidRuntime(1158): at android.view.View.performClick(View.java:4204) 05-23 14:47:55.187: E/AndroidRuntime(1158): at android.view.View$PerformClick.run(View.java:17355) 05-23 14:47:55.187: E/AndroidRuntime(1158): at android.os.Handler.handleCallback(Handler.java:725) 05-23 14:47:55.187: E/AndroidRuntime(1158): at android.os.Handler.dispatchMessage(Handler.java:92) 05-23 14:47:55.187: E/AndroidRuntime(1158): at android.os.Looper.loop(Looper.java:137) 05-23 14:47:55.187: E/AndroidRuntime(1158): at android.app.ActivityThread.main(ActivityThread.java:5041) 05-23 14:47:55.187: E/AndroidRuntime(1158): at java.lang.reflect.Method.invokeNative(Native Method) 05-23 14:47:55.187: E/AndroidRuntime(1158): at java.lang.reflect.Method.invoke(Method.java:511) 05-23 14:47:55.187: E/AndroidRuntime(1158): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 05-23 14:47:55.187: E/AndroidRuntime(1158): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 05-23 14:47:55.187: E/AndroidRuntime(1158): at dalvik.system.NativeStart.main(Native Method) 05-23 14:47:55.187: E/AndroidRuntime(1158): Caused by: java.lang.reflect.InvocationTargetException 05-23 14:47:55.187: E/AndroidRuntime(1158): at java.lang.reflect.Method.invokeNative(Native Method) 05-23 14:47:55.187: E/AndroidRuntime(1158): at java.lang.reflect.Method.invoke(Method.java:511) 05-23 14:47:55.187: E/AndroidRuntime(1158): at android.view.View$1.onClick(View.java:3594) 05-23 14:47:55.187: E/AndroidRuntime(1158): ... 11 more 05-23 14:47:55.187: E/AndroidRuntime(1158): Caused by: java.lang.ClassCastException: android.widget.TextView cannot be cast to android.widget.EditText 05-23 14:47:55.187: E/AndroidRuntime(1158): at com.example.bmicalculator.MainActivity.calculateClickHandler(MainActivity.java:23) 05-23 14:47:55.187: E/AndroidRuntime(1158): ... 14 more 05-23 14:47:57.797: I/Process(1158): Sending signal. PID: 1158 SIG: 9

我已确保用于引用的所有 ID 都是正确的。该应用程序似乎是在我将所有内容都移过去之前构建的。

Answer 1

Caused by: java.lang.ClassCastException: android.widget.TextView cannot be cast to android.widget.EditText 05-23 14:45:52.447: E/AndroidRuntime(1083): at 

 EditText weightText = (EditText)findViewById(R.id.weightLabel);
 EditText heightText = (EditText)findViewById(R.id.heightText);

weightText 和 heightText 中的一个是 TextView。