这又是个问题：
01-19 10:46:42.630: E/AndroidRuntime(819): FATAL EXCEPTION: main
01-19 10:46:42.630: E/AndroidRuntime(819): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.as400samplecode/com.as400samplecode.AndroidListViewCursorAdaptorActivity}: java.lang.ClassNotFoundException: Didn't find class "com.as400samplecode.AndroidListViewCursorAdaptorActivity" on path: DexPathList[[zip file "/data/app/com.as400samplecode-2.apk"],nativeLibraryDirectories=[/data/app-lib/com.as400samplecode-2, /system/lib]]
01-19 10:46:42.630: E/AndroidRuntime(819): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2137)
01-19 10:46:42.630: E/AndroidRuntime(819): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
01-19 10:46:42.630: E/AndroidRuntime(819): at android.app.ActivityThread.access$600(ActivityThread.java:141)
01-19 10:46:42.630: E/AndroidRuntime(819): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
01-19 10:46:42.630: E/AndroidRuntime(819): at android.os.Handler.dispatchMessage(Handler.java:99)
01-19 10:46:42.630: E/AndroidRuntime(819): at android.os.Looper.loop(Looper.java:137)
01-19 10:46:42.630: E/AndroidRuntime(819): at android.app.ActivityThread.main(ActivityThread.java:5103)
01-19 10:46:42.630: E/AndroidRuntime(819): at java.lang.reflect.Method.invokeNative(Native Method)
01-19 10:46:42.630: E/AndroidRuntime(819): at java.lang.reflect.Method.invoke(Method.java:525)
01-19 10:46:42.630: E/AndroidRuntime(819): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
01-19 10:46:42.630: E/AndroidRuntime(819): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
01-19 10:46:42.630: E/AndroidRuntime(819): at dalvik.system.NativeStart.main(Native Method)
01-19 10:46:42.630: E/AndroidRuntime(819): Caused by: java.lang.ClassNotFoundException: Didn't find class "com.as400samplecode.AndroidListViewCursorAdaptorActivity" on path: DexPathList[[zip file "/data/app/com.as400samplecode-2.apk"],nativeLibraryDirectories=[/data/app-lib/com.as400samplecode-2, /system/lib]]
01-19 10:46:42.630: E/AndroidRuntime(819): at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:53)
01-19 10:46:42.630: E/AndroidRuntime(819): at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
01-19 10:46:42.630: E/AndroidRuntime(819): at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
01-19 10:46:42.630: E/AndroidRuntime(819): at android.app.Instrumentation.newActivity(Instrumentation.java:1061)
01-19 10:46:42.630: E/AndroidRuntime(819): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2128)
01-19 10:46:42.630: E/AndroidRuntime(819): ... 11 more
这是我的MainActivity.java。
package com.example.bago;
import com.as400samplecode.R;
import android.app.Activity;
import android.database.Cursor;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.EditText;
import android.widget.FilterQueryProvider;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;
import android.widget.Toast;
public class MainActivity extends Activity {
private CountriesDbAdapter dbHelper;
private SimpleCursorAdapter dataAdapter;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
dbHelper = new CountriesDbAdapter(this);
dbHelper.open();
//Clean all data
dbHelper.deleteAllCountries();
//Add some data
dbHelper.insertSomeCountries();
//Generate ListView from SQLite Database
displayListView();
}
private void displayListView() {
Cursor cursor = dbHelper.fetchAllCountries();
// The desired columns to be bound
String[] columns = new String[] {
CountriesDbAdapter.KEY_CODE,
CountriesDbAdapter.KEY_NAME,
CountriesDbAdapter.KEY_CONTINENT,
CountriesDbAdapter.KEY_REGION
};
// the XML defined views which the data will be bound to
int[] to = new int[] {
R.id.code,
R.id.name,
R.id.continent,
R.id.region,
};
// create the adapter using the cursor pointing to the desired data
//as well as the layout information
dataAdapter = new SimpleCursorAdapter(
this, R.layout.country_info,
cursor,
columns,
to,
0);
ListView listView = (ListView) findViewById(R.id.listView1);
// Assign adapter to ListView
listView.setAdapter(dataAdapter);
listView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> listView, View view,
int position, long id) {
// Get the cursor, positioned to the corresponding row in the result set
Cursor cursor = (Cursor) listView.getItemAtPosition(position);
// Get the state's capital from this row in the database.
String countryCode =
cursor.getString(cursor.getColumnIndexOrThrow("code"));
Toast.makeText(getApplicationContext(),
countryCode, Toast.LENGTH_SHORT).show();
}
});
EditText myFilter = (EditText) findViewById(R.id.myFilter);
myFilter.addTextChangedListener(new TextWatcher() {
public void afterTextChanged(Editable s) {
}
public void beforeTextChanged(CharSequence s, int start,
int count, int after) {
}
public void onTextChanged(CharSequence s, int start,
int before, int count) {
dataAdapter.getFilter().filter(s.toString());
}
});
dataAdapter.setFilterQueryProvider(new FilterQueryProvider() {
public Cursor runQuery(CharSequence constraint) {
return dbHelper.fetchCountriesByName(constraint.toString());
}
});
}
}
Country.java
package com.example.bago;
public class Country {
String code = null;
String name = null;
String continent = null;
String region = null;
public String getCode() {
return code;
}
public void setCode(String code) {
this.code = code;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getContinent() {
return continent;
}
public void setContinent(String continent) {
this.continent = continent;
}
public String getRegion() {
return region;
}
public void setRegion(String region) {
this.region = region;
}
}
CountriesDbAdapter.java
package com.example.bago;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
public class CountriesDbAdapter {
public static final String KEY_ROWID = "_id";
public static final String KEY_CODE = "code";
public static final String KEY_NAME = "name";
public static final String KEY_CONTINENT = "continent";
public static final String KEY_REGION = "region";
private static final String TAG = "CountriesDbAdapter";
private DatabaseHelper mDbHelper;
private SQLiteDatabase mDb;
private static final String DATABASE_NAME = "World";
private static final String SQLITE_TABLE = "Country";
private static final int DATABASE_VERSION = 1;
private final Context mCtx;
private static final String DATABASE_CREATE =
"CREATE TABLE if not exists " + SQLITE_TABLE + " (" +
KEY_ROWID + " integer PRIMARY KEY autoincrement," +
KEY_CODE + "," +
KEY_NAME + "," +
KEY_CONTINENT + "," +
KEY_REGION + "," +
" UNIQUE (" + KEY_CODE +"));";
private static class DatabaseHelper extends SQLiteOpenHelper {
DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
Log.w(TAG, DATABASE_CREATE);
db.execSQL(DATABASE_CREATE);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
Log.w(TAG, "Upgrading database from version " + oldVersion + " to "
+ newVersion + ", which will destroy all old data");
db.execSQL("DROP TABLE IF EXISTS " + SQLITE_TABLE);
onCreate(db);
}
}
public CountriesDbAdapter(Context ctx) {
this.mCtx = ctx;
}
public CountriesDbAdapter open() throws SQLException {
mDbHelper = new DatabaseHelper(mCtx);
mDb = mDbHelper.getWritableDatabase();
return this;
}
public void close() {
if (mDbHelper != null) {
mDbHelper.close();
}
}
public long createCountry(String code, String name,
String continent, String region) {
ContentValues initialValues = new ContentValues();
initialValues.put(KEY_CODE, code);
initialValues.put(KEY_NAME, name);
initialValues.put(KEY_CONTINENT, continent);
initialValues.put(KEY_REGION, region);
return mDb.insert(SQLITE_TABLE, null, initialValues);
}
public boolean deleteAllCountries() {
int doneDelete = 0;
doneDelete = mDb.delete(SQLITE_TABLE, null , null);
Log.w(TAG, Integer.toString(doneDelete));
return doneDelete > 0;
}
public Cursor fetchCountriesByName(String inputText) throws SQLException {
Log.w(TAG, inputText);
Cursor mCursor = null;
if (inputText == null || inputText.length () == 0) {
mCursor = mDb.query(SQLITE_TABLE, new String[] {KEY_ROWID,
KEY_CODE, KEY_NAME, KEY_CONTINENT, KEY_REGION},
null, null, null, null, null);
}
else {
mCursor = mDb.query(true, SQLITE_TABLE, new String[] {KEY_ROWID,
KEY_CODE, KEY_NAME, KEY_CONTINENT, KEY_REGION},
KEY_NAME + " like '%" + inputText + "%'", null,
null, null, null, null);
}
if (mCursor != null) {
mCursor.moveToFirst();
}
return mCursor;
}
public Cursor fetchAllCountries() {
Cursor mCursor = mDb.query(SQLITE_TABLE, new String[] {KEY_ROWID,
KEY_CODE, KEY_NAME, KEY_CONTINENT, KEY_REGION},
null, null, null, null, null);
if (mCursor != null) {
mCursor.moveToFirst();
}
return mCursor;
}
public void insertSomeCountries() {
createCountry("AFG","Afghanistan","Asia","Southern and Central Asia");
createCountry("ALB","Albania","Europe","Southern Europe");
createCountry("DZA","Algeria","Africa","Northern Africa");
createCountry("ASM","American Samoa","Oceania","Polynesia");
createCountry("AND","Andorra","Europe","Southern Europe");
createCountry("AGO","Angola","Africa","Central Africa");
createCountry("AIA","Anguilla","North America","Caribbean");
}
}
答案 0 :(得分：0)
很难说，但看起来android正在尝试加载以下活动
java.lang.ClassNotFoundException：未找到类“com.as400samplecode.AndroidListViewCursorAdaptorActivity”
也许你的清单文件中有AndroidListViewCursorAdaptorActivity，但你的课程中没有它？