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尝试运行多类项目时Android Studio模拟器崩溃

2015-11-20 87 views
1

我有一个多类项目。这是任务：创建一个应用程序，允许输入信息来订购包裹递送。我必须拥有两个额外的类，并将信息从一个传递到另一个，但我不确定应用程序为什么要崩溃以查看代码是否可用。我的导师没有多少运气就看过它，但他很忙，我决定看看别人是否可以偷看它。提前致谢！尝试运行多类项目时Android Studio模拟器崩溃

的MainActivity.Java

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

 
public class MainActivity extends Activity { 
 

 
    parcel parcelObject; 
 
    address addressObject; 
 
    EditText startAdd; 
 
    EditText startZip; 
 
    EditText endAdd; 
 
    EditText endZip; 
 
    EditText parcelWeight; 
 
    Button button; 
 
    TextView textView; 
 

 

 

 

 

 

 
    @Override 
 
    protected void onCreate(Bundle savedInstanceState) { 
 
     super.onCreate(savedInstanceState); 
 
     setContentView(R.layout.activity_main); 
 
     button = (Button) findViewById(R.id.button); 
 
     //addressObject = new address(this); 
 
     parcelObject = new parcel(this); 
 

 

 

 
    } 
 
    public void buttonOnClick(View v) { 
 
     Button button=(Button) v; 
 
     TextView textView = (TextView) findViewById(R.id.shippingTotal); 
 
     parcelObject.shipping(); 
 
     textView.setText("Your Shipping Total is: $ " + parcelObject.sCost); 
 
    } 
 
    @Override 
 
    public boolean onCreateOptionsMenu(Menu menu) { 
 
     // Inflate the menu; this adds items to the action bar if it is present. 
 
     getMenuInflater().inflate(R.menu.menu_main, menu); 
 
     return true; 
 
    } 
 

 
    @Override 
 
    public boolean onOptionsItemSelected(MenuItem item) { 
 
     // Handle action bar item clicks here. The action bar will 
 
     // automatically handle clicks on the Home/Up button, so long 
 
     // as you specify a parent activity in AndroidManifest.xml. 
 
     int id = item.getItemId(); 
 

 
     //noinspection SimplifiableIfStatement 
 
     if (id == R.id.action_settings) { 
 
      return true; 
 
     } 
 

 
     return super.onOptionsItemSelected(item); 
 
    } 
 
}

address.java

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

 

 
/** 
 
* Created by Cyn on 10/16/2015. 
 
*/ 
 
public class address { 
 
    parcel parcelObject; 
 
    EditText startAdd; 
 
    EditText startZip; 
 
    EditText endAdd; 
 
    EditText endZip; 
 

 

 
    double sZip, eZip; 
 

 
    public address (Activity activity) { 
 
     startAdd = (EditText)activity.findViewById(R.id.originZip); 
 
     startZip = (EditText)activity.findViewById(R.id.originZip); 
 
     endAdd = (EditText)activity.findViewById(R.id.destAdd); 
 
     endZip = (EditText)activity.findViewById(R.id.destZip); 
 

 

 
     sZip = Double.parseDouble(startZip.getText().toString()); 
 
     eZip = Double.parseDouble(endAdd.getText().toString()); 
 
    } 
 

 

 

 

 
}

和parcel.java

import android.app.Activity; 
 
import android.widget.Button; 
 
import android.widget.EditText; 
 
import android.widget.TextView; 
 

 
/** 
 
* Created by Cyn on 10/16/2015. 
 
*/ 
 
public class parcel { 
 
    address addressObject; 
 
    EditText startAdd; 
 
    EditText startZip; 
 
    EditText endAdd; 
 
    EditText endZip; 
 
    EditText parcelWeight; 
 

 
    double sZip, eZip, pWeight, sCost; 
 

 
    public parcel(Activity activity) { 
 
     addressObject = new address(activity); 
 
     startAdd = addressObject.startAdd; 
 
     endAdd = addressObject.endAdd; 
 
     endZip = addressObject.endZip; 
 
     sZip = addressObject.sZip; 
 
     eZip = addressObject.eZip; 
 

 
     parcelWeight = (EditText)activity.findViewById(R.id.packageWeight); 
 
     pWeight = Double.parseDouble(parcelWeight.getText().toString()); 
 

 

 
    } 
 

 
    public void shipping() { 
 

 
     if (sZip == eZip) { 
 
      sCost = pWeight * 1; 
 
     } else { 
 
      sCost = pWeight * 2; 
 
     } 
 

 
    } 
 
}

而在Android的显示器的错误部分是：

11-20 01:27:53.768 1444-1444/cyn.assignment4 D/AndroidRuntime: Shutting down VM 
 
11-20 01:27:53.772 1444-1444/cyn.assignment4 E/AndroidRuntime: FATAL EXCEPTION: main 
 
11-20 01:27:53.772 1444-1444/cyn.assignment4 E/AndroidRuntime: Process: cyn.assignment4, PID: 1444 
 
11-20 01:27:53.772 1444-1444/cyn.assignment4 E/AndroidRuntime: java.lang.RuntimeException: Unable to start activity ComponentInfo{cyn.assignment4/cyn.assignment4.MainActivity}: java.lang.NumberFormatException: Invalid double: "" 
 
11-20 01:27:53.772 1444-1444/cyn.assignment4 E/AndroidRuntime:  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416) 
 
11-20 01:27:53.772 1444-1444/cyn.assignment4 E/AndroidRuntime:  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476) 
 
11-20 01:27:53.772 1444-1444/cyn.assignment4 E/AndroidRuntime:  at android.app.ActivityThread.-wrap11(ActivityThread.java) 
 
11-20 01:27:53.772 1444-1444/cyn.assignment4 E/AndroidRuntime:  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344) 
 
11-20 01:27:53.772 1444-1444/cyn.assignment4 E/AndroidRuntime:  at android.os.Handler.dispatchMessage(Handler.java:102) 
 
11-20 01:27:53.772 1444-1444/cyn.assignment4 E/AndroidRuntime:  at android.os.Looper.loop(Looper.java:148) 
 
11-20 01:27:53.772 1444-1444/cyn.assignment4 E/AndroidRuntime:  at android.app.ActivityThread.main(ActivityThread.java:5417) 
 
11-20 01:27:53.772 1444-1444/cyn.assignment4 E/AndroidRuntime:  at java.lang.reflect.Method.invoke(Native Method) 
 
11-20 01:27:53.772 1444-1444/cyn.assignment4 E/AndroidRuntime:  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
 
11-20 01:27:53.772 1444-1444/cyn.assignment4 E/AndroidRuntime:  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) 
 
11-20 01:27:53.772 1444-1444/cyn.assignment4 E/AndroidRuntime: Caused by: java.lang.NumberFormatException: Invalid double: "" 
 
11-20 01:27:53.772 1444-1444/cyn.assignment4 E/AndroidRuntime:  at java.lang.StringToReal.invalidReal(StringToReal.java:63) 
 
11-20 01:27:53.772 1444-1444/cyn.assignment4 E/AndroidRuntime:  at java.lang.StringToReal.parseDouble(StringToReal.java:267) 
 
11-20 01:27:53.772 1444-1444/cyn.assignment4 E/AndroidRuntime:  at java.lang.Double.parseDouble(Double.java:301) 
 
11-20 01:27:53.772 1444-1444/cyn.assignment4 E/AndroidRuntime:  at cyn.assignment4.address.<init>(address.java:33) 
 
11-20 01:27:53.772 1444-1444/cyn.assignment4 E/AndroidRuntime:  at cyn.assignment4.parcel.<init>(parcel.java:22) 
 
11-20 01:27:53.772 1444-1444/cyn.assignment4 E/AndroidRuntime:  at cyn.assignment4.MainActivity.onCreate(MainActivity.java:35) 
 
11-20 01:27:53.772 1444-1444/cyn.assignment4 E/AndroidRuntime:  at android.app.Activity.performCreate(Activity.java:6237) 
 
11-20 01:27:53.772 1444-1444/cyn.assignment4 E/AndroidRuntime:  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107) 
 
11-20 01:27:53.772 1444-1444/cyn.assignment4 E/AndroidRuntime:  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369) 
 
11-20 01:27:53.772 1444-1444/cyn.assignment4 E/AndroidRuntime:  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)  
 
11-20 01:27:53.772 1444-1444/cyn.assignment4 E/AndroidRuntime:  at android.app.ActivityThread.-wrap11(ActivityThread.java)  
 
11-20 01:27:53.772 1444-1444/cyn.assignment4 E/AndroidRuntime:  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)  
 
11-20 01:27:53.772 1444-1444/cyn.assignment4 E/AndroidRuntime:  at android.os.Handler.dispatchMessage(Handler.java:102)  
 
11-20 01:27:53.772 1444-1444/cyn.assignment4 E/AndroidRuntime:  at android.os.Looper.loop(Looper.java:148)  
 
11-20 01:27:53.772 1444-1444/cyn.assignment4 E/AndroidRuntime:  at android.app.ActivityThread.main(ActivityThread.java:5417)  
 
11-20 01:27:53.772 1444-1444/cyn.assignment4 E/AndroidRuntime:  at java.lang.reflect.Method.invoke(Native Method)  
 
11-20 01:27:53.772 1444-1444/cyn.assignment4 E/AndroidRuntime:  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)  
 
11-20 01:27:53.772 1444-1444/cyn.assignment4 E/AndroidRuntime:  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)  
 
11-20 01:28:36.701 1444-1451/cyn.assignment4 W/art: Suspending all threads took: 135.053ms 
 
11-20 01:30:38.025 1444-1451/cyn.assignment4 W/art: Suspending all threads took: 218.758ms 
 
11-20 01:31:17.505 1444-1444/cyn.assignment4 I/Process: Sending signal. PID: 1444 SIG: 9

来源

2015-11-20 Cynesra

+0

我建议您学习如何阅读错误消息。问题写在那里：*在第33行的Address类的构造函数中，无效的double：“*”。如果你去那里，当你调用'Double.parseDouble（）'时， 。 –

+0

里卡多是对的。错误的是用空字符串参数调用Double.parseDouble。这个错误似乎是你正在创建一个对象太早。 – Seelenvirtuose

回答

0

尽管答案是部分正确的，但两个小小的更改使代码正常工作。一个是简单的拼写错误（我没有发现）。

首先，在主要活动发生变化：当我们搬到了“parcelObject =新的包裹（本）;从的onCreate，到的buttonOnClick

@Override 
 
    protected void onCreate(Bundle savedInstanceState) { 
 
     super.onCreate(savedInstanceState); 
 
     setContentView(R.layout.activity_main); 
 
     button = (Button) findViewById(R.id.button); 
 
     //addressObject = new address(this); 
 
     
 

 

 

 
    } 
 
    public void buttonOnClick(View v) { 
 
     parcelObject = new parcel(this); 
 
     Button button=(Button) v; 
 
     TextView textView = (TextView) findViewById(R.id.shippingTotal); 
 
     parcelObject.shipping(); 
 
     textView.setText("Your Shipping Total is: $ " + parcelObject.sCost); 
 
    }

然后顶部小错字用：

sZip = Double.parseDouble(startZip.getText().toString()); 
 
eZip = Double.parseDouble(endAdd.getText().toString())

它应该是：

sZip = Double.parseDouble(startZip.getText().toString()); 
 
eZip = Double.parseDouble(endZip.getText().toString())

“endAdd” 的诗句 “endZip”，什么是必须发生的是，我可能是按错了自动填充。

但是为了让代码多一些，这是最后的地址。java代码：

package cyn.assignment4; 
 

 
import android.text.TextUtils; 
 
import android.widget.TextView; 
 
import android.app.Activity; 
 
import android.os.Bundle; 
 
import android.view.Menu; 
 
import android.view.MenuItem; 
 
import android.view.View; 
 
import android.widget.Button; 
 
import android.widget.EditText; 
 

 

 
/** 
 
* Created by Cyn on 10/16/2015. 
 
*/ 
 
public class address { 
 
    parcel parcelObject; 
 
    EditText startAdd; 
 
    EditText startZip; 
 
    EditText endAdd; 
 
    EditText endZip; 
 

 

 
    double sZip, eZip; 
 

 
    public address (Activity activity) { 
 
     startAdd = (EditText)activity.findViewById(R.id.originZip); 
 
     startZip = (EditText)activity.findViewById(R.id.originZip); 
 
     endAdd = (EditText)activity.findViewById(R.id.destAdd); 
 
     endZip = (EditText)activity.findViewById(R.id.destZip); 
 

 
     String checkUserInput = startZip.getText().toString(); 
 
     if (TextUtils.isEmpty(checkUserInput)) { 
 
      startZip.setError("You must enter a valid zip code"); 
 
     } 
 
     else { 
 
      sZip = Double.parseDouble(startZip.getText().toString()); 
 

 
     } 
 

 
     String checkUserInput2 = endZip.getText().toString(); 
 
     if (TextUtils.isEmpty(checkUserInput2)) { 
 
      endZip.setError("You must enter a valid zip code!"); 
 
     } 
 
     else { 
 
      eZip = Double.parseDouble(endZip.getText().toString()); 
 
     } 
 

 
    }

因此，随着主要活动的小运动机会和应用程序的工作原理就像一个魅力:)。

来源

2015-12-03 21:23:40 Cynesra

0 
sZip = Double.parseDouble(startZip.getText().toString()); 
eZip = Double.parseDouble(endAdd.getText().toString());

这是它。您试图从String解析double，而String为空。先用

if(!startZip.getText().toString().isEmpty&& startZip.getText()!=null){ 
    sZip = Double.parseDouble(startZip.getText().toString()); 
} 
if(!endAdd.getText().toString().isEmpty&&endAdd.getText()!=null)...

来源

2015-11-20 07:51:38 RexSplode

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