我的Android应用在运行时关闭，代码无错误

Question

I'm coding a dice game as a holiday project, but I'm kinda stuck right now: there are no errors anywhere in my code, but still, the app won't start. I really don't see why. I tried cleaning project, fixing properties but nothing works. Any help would be great.

Java code:

package com.bdec.tritsen;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;

public class NamenActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_namen);
}
public void spelregels(View v)
{
    Toast.makeText(getApplicationContext(), "Spelregels komen binnenkort", Toast.LENGTH_SHORT).show();
}

public void beginSpel(View v)
{
    EditText Field1 = (EditText) findViewById(R.id.naam1);
    EditText Field2 = (EditText) findViewById(R.id.naam2);
    EditText Field3 = (EditText) findViewById(R.id.naam3);
    EditText Field4 = (EditText) findViewById(R.id.naam4);
    EditText Field5 = (EditText) findViewById(R.id.naam5);
    EditText Field6 = (EditText) findViewById(R.id.naam6);
    EditText Field7 = (EditText) findViewById(R.id.naam7);
    EditText Field8 = (EditText) findViewById(R.id.naam8);
    EditText Field9 = (EditText) findViewById(R.id.naam9);
    EditText Field10 = (EditText) findViewById(R.id.naam10);

    String naam1 = Field1.getText().toString();
    String naam2 = Field2.getText().toString();
    String naam3 = Field3.getText().toString();
    String naam4 = Field4.getText().toString();
    String naam5 = Field5.getText().toString();
    String naam6 = Field6.getText().toString();
    String naam7 = Field7.getText().toString();
    String naam8 = Field8.getText().toString();
    String naam9 = Field9.getText().toString();
    String naam10 = Field10.getText().toString();


    }
}

The XML code for the buttons:

<Button
    android:id="@+id/buttonBegin"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:layout_alignParentRight="true"
    android:text="Begin" 
    android:onClick="beginSpel"/>

<Button
    android:id="@+id/buttonSpelregels"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:layout_alignParentLeft="true"
    android:text="Spelregels"
    android:onClick="spelregels" />

Answer 1

If it just won't even start and you have no errors in your code or in your logcat then you need to have it declared in your manifest with the Launcher intent-filter . Something like

   <activity
        android:name="com.bdec.tritsen.NamenActivity "
        android:label="NamenActivity " >       
        <intent-filter>
             <action android:name="android.intent.action.MAIN" />
             <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>         
    </activity>

If you already have this then you will need to post logcat so we can see the source of the problem.

The manifest Docs explain pretty well what can be and what needs to be in the manifest