我试图创建一个可查看的SQLite数据库来查看但是当我尝试打开它时它会一直崩溃
我尝试多次打开它并改变了一些东西来尝试修复它，但看到我没有修复它我可能会让它变得更糟。
当我打开它并且它立即崩溃时，我无法到达任何地方。对不起代码墙，但我想我也可能给你太多的信息而不是太少。
任何意见都表示赞赏。
package com.example.listviewfromsqlitedb;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteException;
import android.database.sqlite.SQLiteOpenHelper;
public class DBHelper extends SQLiteOpenHelper{
public SQLiteDatabase DB;
public String DBPath;
public static String DBName = "sample";
public static final int version = '1';
public static Context currentContext;
public static String tableName = "Resource";
public DBHelper(Context context) {
super(context, DBName, null, version);
currentContext = context;
DBPath = "/data/data/" + context.getPackageName() + "/databases";
createDatabase();
}
@Override
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
}
private void createDatabase() {
boolean dbExists = checkDbExists();
if (dbExists) {
// do nothing
} else {
DB = currentContext.openOrCreateDatabase(DBName, 0, null);
DB.execSQL("CREATE TABLE IF NOT EXISTS " +
tableName +
" (LastName VARCHAR, FirstName VARCHAR," +
" Country VARCHAR, Age INT(3));");
DB.execSQL("INSERT INTO " +
tableName +
" Values ('M','shumi','India',25);");
DB.execSQL("INSERT INTO " +
tableName +
" Values ('C','sarah','India',25);");
DB.execSQL("INSERT INTO " +
tableName +
" Values ('D','Lavya','USA',20);");
DB.execSQL("INSERT INTO " +
tableName +
" Values ('V','Avi','EU',25);");
DB.execSQL("INSERT INTO " +
tableName +
" Values ('T','Shenoi','Bangla',25);");
DB.execSQL("INSERT INTO " +
tableName +
" Values ('L','Lamha','Australia',20);");
}
}
private boolean checkDbExists() {
SQLiteDatabase checkDB = null;
try {
String myPath = DBPath + DBName;
checkDB = SQLiteDatabase.openDatabase(myPath, null,
SQLiteDatabase.OPEN_READONLY);
} catch (SQLiteException e) {
// database does't exist yet.
}
if (checkDB != null) {
checkDB.close();
}
return checkDB != null ? true : false;
}
}
package com.example.listviewfromsqlitedb;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.os.Build;
public class ListViewFromSQLiteDB extends ActionBarActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment()).commit();
}
}
@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;
}
@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();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container,
false);
return rootView;
}
}
}
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.listviewfromsqlitedb"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="19" />
<application android:icon="@drawable/ic_launcher"
android:label="@string/app_name">
<activity android:name="com.example.ListViewFromSQLiteDB.DataListView"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/container"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello_world"
/>
</LinearLayout>
05-16 23:31:02.535: D/AndroidRuntime(31302): Shutting down VM
05-16 23:31:02.555: W/dalvikvm(31302): threadid=1: thread exiting with uncaught exception (group=0x4143f2a0)
05-16 23:31:02.585: E/AndroidRuntime(31302): FATAL EXCEPTION: main
05-16 23:31:02.585: E/AndroidRuntime(31302): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.listviewfromsqlitedb/com.example.listviewfromsqlitedb.ListViewFromSQLiteDB}: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
05-16 23:31:02.585: E/AndroidRuntime(31302): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2100)
05-16 23:31:02.585: E/AndroidRuntime(31302): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2125)
05-16 23:31:02.585: E/AndroidRuntime(31302): at android.app.ActivityThread.access$600(ActivityThread.java:140)
05-16 23:31:02.585: E/AndroidRuntime(31302): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1227)
05-16 23:31:02.585: E/AndroidRuntime(31302): at android.os.Handler.dispatchMessage(Handler.java:99)
05-16 23:31:02.585: E/AndroidRuntime(31302): at android.os.Looper.loop(Looper.java:137)
05-16 23:31:02.585: E/AndroidRuntime(31302): at android.app.ActivityThread.main(ActivityThread.java:4898)
05-16 23:31:02.585: E/AndroidRuntime(31302): at java.lang.reflect.Method.invokeNative(Native Method)
05-16 23:31:02.585: E/AndroidRuntime(31302): at java.lang.reflect.Method.invoke(Method.java:511)
05-16 23:31:02.585: E/AndroidRuntime(31302): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1006)
05-16 23:31:02.585: E/AndroidRuntime(31302): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:773)
05-16 23:31:02.585: E/AndroidRuntime(31302): at dalvik.system.NativeStart.main(Native Method)
05-16 23:31:02.585: E/AndroidRuntime(31302): Caused by: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
05-16 23:31:02.585: E/AndroidRuntime(31302): at android.support.v7.app.ActionBarActivityDelegate.onCreate(ActionBarActivityDelegate.java:108)
05-16 23:31:02.585: E/AndroidRuntime(31302): at android.support.v7.app.ActionBarActivityDelegateICS.onCreate(ActionBarActivityDelegateICS.java:57)
05-16 23:31:02.585: E/AndroidRuntime(31302): at android.support.v7.app.ActionBarActivity.onCreate(ActionBarActivity.java:98)
05-16 23:31:02.585: E/AndroidRuntime(31302): at com.example.listviewfromsqlitedb.ListViewFromSQLiteDB.onCreate(ListViewFromSQLiteDB.java:18)
05-16 23:31:02.585: E/AndroidRuntime(31302): at android.app.Activity.performCreate(Activity.java:5206)
05-16 23:31:02.585: E/AndroidRuntime(31302): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1083)
05-16 23:31:02.585: E/AndroidRuntime(31302): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2064)
05-16 23:31:02.585: E/AndroidRuntime(31302): ... 11 more
05-16 23:31:42.800: D/AndroidRuntime(32421): Shutting down VM
05-16 23:31:42.800: W/dalvikvm(32421): threadid=1: thread exiting with uncaught exception (group=0x4143f2a0)
05-16 23:31:42.810: E/AndroidRuntime(32421): FATAL EXCEPTION: main
05-16 23:31:42.810: E/AndroidRuntime(32421): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.listviewfromsqlitedb/com.example.listviewfromsqlitedb.ListViewFromSQLiteDB}: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
05-16 23:31:42.810: E/AndroidRuntime(32421): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2100)
05-16 23:31:42.810: E/AndroidRuntime(32421): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2125)
05-16 23:31:42.810: E/AndroidRuntime(32421): at android.app.ActivityThread.access$600(ActivityThread.java:140)
05-16 23:31:42.810: E/AndroidRuntime(32421): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1227)
05-16 23:31:42.810: E/AndroidRuntime(32421): at android.os.Handler.dispatchMessage(Handler.java:99)
05-16 23:31:42.810: E/AndroidRuntime(32421): at android.os.Looper.loop(Looper.java:137)
05-16 23:31:42.810: E/AndroidRuntime(32421): at android.app.ActivityThread.main(ActivityThread.java:4898)
05-16 23:31:42.810: E/AndroidRuntime(32421): at java.lang.reflect.Method.invokeNative(Native Method)
05-16 23:31:42.810: E/AndroidRuntime(32421): at java.lang.reflect.Method.invoke(Method.java:511)
05-16 23:31:42.810: E/AndroidRuntime(32421): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1006)
05-16 23:31:42.810: E/AndroidRuntime(32421): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:773)
05-16 23:31:42.810: E/AndroidRuntime(32421): at dalvik.system.NativeStart.main(Native Method)
05-16 23:31:42.810: E/AndroidRuntime(32421): Caused by: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
05-16 23:31:42.810: E/AndroidRuntime(32421): at android.support.v7.app.ActionBarActivityDelegate.onCreate(ActionBarActivityDelegate.java:108)
05-16 23:31:42.810: E/AndroidRuntime(32421): at android.support.v7.app.ActionBarActivityDelegateICS.onCreate(ActionBarActivityDelegateICS.java:57)
05-16 23:31:42.810: E/AndroidRuntime(32421): at android.support.v7.app.ActionBarActivity.onCreate(ActionBarActivity.java:98)
05-16 23:31:42.810: E/AndroidRuntime(32421): at com.example.listviewfromsqlitedb.ListViewFromSQLiteDB.onCreate(ListViewFromSQLiteDB.java:18)
05-16 23:31:42.810: E/AndroidRuntime(32421): at android.app.Activity.performCreate(Activity.java:5206)
05-16 23:31:42.810: E/AndroidRuntime(32421): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1083)
05-16 23:31:42.810: E/AndroidRuntime(32421): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2064)
05-16 23:31:42.810: E/AndroidRuntime(32421): ... 11 more
答案 0 :(得分：2)
java.lang.ClassNotFoundException: com.example.ListViewFromSQLiteDB.DataListView
您在AndroidManifest.xml中声明了一个似乎不存在的类。也许你的意思是：
<activity android:name="com.example.listviewfromsqlitedb.ListViewFromSQLiteDB"
android:label="@string/app_name">
另请注意，您要发布的每个活动都必须在AndroidManifest.xml中声明。如果这是您的完整xml，您还必须声明MainActivity。
答案 1 :(得分：0)
我必须添加
android:theme="@style/AppTheme"
到清单。谢谢你的帮助。