我对StackOverflow有点新意，我想知道是否可以对以下问题进行一些输入：我试图在sqlite database中保存一些数据，但每次尝试为此，app力关闭，我不知道为什么。我已经清理了文件，没有任何问题。 （我不知道我做错了什么 - 但有些东西编程不正确。）
JAVA：
import android.app.Activity;
import android.app.AlertDialog;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.ViewGroup;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.FrameLayout;
import android.widget.TimePicker;
import android.os.Bundle;
import android.support.v4.app.DialogFragment;
import android.support.v4.app.FragmentActivity;
import android.text.format.DateFormat;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.app.Activity;
import android.app.Dialog;
import android.app.TimePickerDialog;
import android.os.Bundle;
import android.support.v4.app.DialogFragment;
import android.text.format.DateFormat;
import android.widget.TimePicker;
import com.nfc.linkingmanager.TimePickerFragment.TimePickedListener;
import java.util.Calendar;
public class AddEditCountry extends Activity implements TimePickedListener
{
private TextView mPickedTimeText;
private Button mPickTimeButton;
private long rowID;
private EditText nameEt;
private EditText capEt;
private EditText codeEt;
private TimePicker timeEt;
public static final String KEY_BUNDLE_TIME = "time";
public static final String KEY_BUNDLE_MIN = "min";
@Override
public void onCreate(Bundle savedInstanceState)
{
setContentView(R.layout.add_country); // where your_layout is the name of the xml file with the layout you want to use minus the .xml extention
//this layout must contain all of these views below that you are trying to initialize
nameEt = (EditText) findViewById(R.id.nameEdit);
capEt = (EditText) findViewById(R.id.capEdit);
codeEt = (EditText) findViewById(R.id.codeEdit);
timeEt = (TimePicker) findViewById(R.id.timeEdit);
Bundle extras = getIntent().getExtras();
if (extras != null)
{
rowID = extras.getLong("row_id");
nameEt.setText(extras.getString("name"));
capEt.setText(extras.getString("cap"));
codeEt.setText(extras.getString("code"));
String time = extras.getString("time");
String[] parts = time.split(":");
timeEt.setCurrentHour(Integer.valueOf(parts[0]));
timeEt.setCurrentMinute(Integer.valueOf(parts[1]));
timeEt.setIs24HourView(false);
}
Button saveButton =(Button) findViewById(R.id.saveBtn);
saveButton.setOnClickListener(new OnClickListener() {
public void onClick(View v)
{
if (nameEt.getText().length() != 0)
{
AsyncTask<Object, Object, Object> saveContactTask =
new AsyncTask<Object, Object, Object>()
{
@Override
protected Object doInBackground(Object... params)
{
saveContact();
return null;
}
@Override
protected void onPostExecute(Object result)
{
finish();
}
};
saveContactTask.execute((Object[]) null);
}
else
{
AlertDialog.Builder alert = new AlertDialog.Builder(AddEditCountry.this);
alert.setTitle(R.string.errorTitle);
alert.setMessage(R.string.errorMessage);
alert.setPositiveButton(R.string.errorButton, null);
alert.show();
}
}
});
}
private void saveContact()
{
DatabaseConnector dbConnector = new DatabaseConnector(this);
if (getIntent().getExtras() == null)
{
dbConnector.insertContact(nameEt.getText().toString(),
capEt.getText().toString(),
timeEt.getCurrentHour().toString() + ":"
+ timeEt.getCurrentMinute().toString(),
codeEt.getText().toString());
}
else
{
dbConnector.insertContact(nameEt.getText().toString(),
capEt.getText().toString(),
timeEt.getCurrentHour().toString() + ":"
+ timeEt.getCurrentMinute().toString(),
codeEt.getText().toString());
}
}
@Override
public void onTimePicked(Calendar time)
{
// display the selected time in the TextView
mPickedTimeText.setText(DateFormat.format("h:mm a", time));
}
}
XML：
<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content" android:layout_weight="1">
<LinearLayout android:id="@+id/linearLayout"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:padding="5dp">
<EditText android:id="@+id/nameEdit"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:imeOptions="actionNext"
android:hint="@string/name_hint"
android:inputType="textPersonName|textCapWords"/>
<EditText android:id="@+id/capEdit"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:imeOptions="actionNext"
android:hint="@string/cap_hint"
android:inputType="textPersonName|textCapWords"/>
<TextView
android:id="@+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Data Limit"
android:textColor="#ffffff"
android:textAppearance="?android:textAppearanceMedium" />
<SeekBar
android:id="@+id/seekBar1"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1.0"
android:gravity="left"
android:textColor="#ffffff"
android:text="10MB" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1.0"
android:gravity="right"
android:textColor="#ffffff"
android:text="Unlimited Data" />
</LinearLayout>
<TextView
android:id="@+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Bandwidth Limit"
android:textColor="#ffffff"
android:textAppearance="?android:textAppearanceMedium" />
<SeekBar
android:id="@+id/seekBar1"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1.0"
android:gravity="left"
android:textColor="#ffffff"
android:text="10kbs" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1.0"
android:textColor="#ffffff"
android:gravity="right"
android:text="Unlimited Bandwidth" />
</LinearLayout>
<TextView
android:id="@+id/TextView02"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:textAppearanceSmall" />
<TextView
android:id="@+id/TextView02"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="WiFi Time Limit"
android:textColor="#ffffff"
android:textAppearance="?android:textAppearanceMedium" />
<TimePicker
android:id="@+id/timeEdit"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:gravity="center"
android:layout_weight="1.0" />
<EditText
android:id="@+id/codeEdit"
android:inputType="textUri"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:ems="10"
android:lines="1"
android:hint="@string/code_hint"
android:imeOptions="actionNext" />
<Button android:id="@+id/saveBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="15dp"
android:layout_gravity="center_horizontal"
android:text="@string/save_btn"/>
</LinearLayout>
</ScrollView>
问题：
清理 - 没问题
LOGCAT:
03-29 13:23:28.950: D/OpenGLRenderer(20744): Enabling debug mode 0
03-29 13:23:33.780: D/AndroidRuntime(20744): Shutting down VM
03-29 13:23:33.780: W/dalvikvm(20744): threadid=1: thread exiting with uncaught exception (group=0x41f7b930)
03-29 13:23:33.790: E/AndroidRuntime(20744): FATAL EXCEPTION: main
03-29 13:23:33.790: E/AndroidRuntime(20744): android.app.SuperNotCalledException: Activity {com.app.gamedemo/com.app.gamedemo.AddEditCountry} did not call through to super.onCreate()
03-29 13:23:33.790: E/AndroidRuntime(20744): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2146)
03-29 13:23:33.790: E/AndroidRuntime(20744): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
03-29 13:23:33.790: E/AndroidRuntime(20744): at android.app.ActivityThread.access$600(ActivityThread.java:141)
03-29 13:23:33.790: E/AndroidRuntime(20744): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
03-29 13:23:33.790: E/AndroidRuntime(20744): at android.os.Handler.dispatchMessage(Handler.java:99)
03-29 13:23:33.790: E/AndroidRuntime(20744): at android.os.Looper.loop(Looper.java:137)
03-29 13:23:33.790: E/AndroidRuntime(20744): at android.app.ActivityThread.main(ActivityThread.java:5041)
03-29 13:23:33.790: E/AndroidRuntime(20744): at java.lang.reflect.Method.invokeNative(Native Method)
03-29 13:23:33.790: E/AndroidRuntime(20744): at java.lang.reflect.Method.invoke(Method.java:511)
03-29 13:23:33.790: E/AndroidRuntime(20744): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
03-29 13:23:33.790: E/AndroidRuntime(20744): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
03-29 13:23:33.790: E/AndroidRuntime(20744): at dalvik.system.NativeStart.main(Native Method)
03-29 13:23:35.390: I/Process(20744): Sending signal. PID: 20744 SIG: 9
答案 0 :(得分：0)
问题在于onCreate()
@Override
public void onCreate(Bundle savedInstanceState)
{
nameEt = (EditText) findViewById(R.id.nameEdit);
capEt = (EditText) findViewById(R.id.capEdit);
codeEt = (EditText) findViewById(R.id.codeEdit);
timeEt = (TimePicker) findViewById(R.id.timeEdit);
在尝试访问setContentView()之前，您需要致电EditTexts，依此类推。您的布局（xml文件）中的Views“实时”，因此它们为null，直到您layout为止。把它改成像
@Override
public void onCreate(Bundle savedInstanceState)
{
setContentView(R.layout.your_layout); // where your_layout is the name of the xml file with the layout you want to use minus the .xml extention
//this layout must contain all of these views below that you are trying to initialize
nameEt = (EditText) findViewById(R.id.nameEdit);
capEt = (EditText) findViewById(R.id.capEdit);
codeEt = (EditText) findViewById(R.id.codeEdit);
timeEt = (TimePicker) findViewById(R.id.timeEdit);
修改
就像错误所说的那样，您正试图将TextView投射到TimePicker。这里
timeEt = (TimePicker) findViewById(R.id.timeEdit);
(R.id.timeEdit)指向TextView，但此处
private TimePicker timeEt;
您将其声明为TimePicker。如果您希望它是TimePicker，那么在xml中更改它
`<TimePicker
android:id="@+id/timeEdit"
style="@style/StyleText"/> `
此外，您的xml中有多个ID
android:id="@+id/codeText"
可能想要改变那个
第二次修改
03-29 13:23:33.790: E/AndroidRuntime(20744): android.app.SuperNotCalledException: Activity {com.app.gamedemo/com.app.gamedemo.AddEditCountry} did not call through to super.onCreate()
logcat中的这一行说明了一切。你没有打电话给super.onCreate()。将以下行添加为onCreate()方法
super.onCreate(savedInstanceState);
阅读logcat时，请查找Fatal Exception的位置。下一行应该说明它是什么（空指针异常，类别抛出异常等等）然后查找引用您的包名称的第一行，它将告诉您从哪里开始寻找错误。防爆。 Main.java 57告诉你，无论致命异常发生在第57行的Main.java文件中。问题可能最初来自其他地方，但这始终是一个好的起点，所以你可以缩小它并发布相关代码如果你需要帮助。