バーチャル キャンパス ツアー用のアプリのコードを書きました。さまざまなファイル (3 つのクラス ファイル) と 3 つの xml ファイルの下で共有しましたが、すべてにエラーはありません。
アプリはエミュレーターに正常にインストールされましたが、見出しに記載されているエラーがスローされます。
私はAndroidとJavaが初めてなので、どんな助けも本当に感謝しています!
誰かが私が間違っている場所を見つけることができますか?
BuildingEdit という名前の 1 つのクラスのコード
package com.example.udbuildingtour;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
public class BuildingEdit extends Activity {
private EditText mNameText;
private EditText mLatText;
private EditText mLongiText;
private Long mRowId;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.building_edit);
setTitle(R.string.edit_building);
mNameText = (EditText) findViewById(R.id.name);
mLatText = (EditText) findViewById(R.id.lat);
mLongiText = (EditText) findViewById(R.id.longi);
Button confirmButton = (Button) findViewById(R.id.confirm);
mRowId = null;
Bundle extras = getIntent().getExtras();
if (extras != null) {
String name = extras.getString(BuildingsDbAdapter.KEY_BUILDINGNAME);
String lat = extras.getString(BuildingsDbAdapter.KEY_LAT);
String longi = extras.getString(BuildingsDbAdapter.KEY_LONGI);
mRowId = extras.getLong(BuildingsDbAdapter.KEY_ID);
if (name != null) {
mNameText.setText(name);
}
if (lat != null) {
mLatText.setText(lat);
}
if (longi != null) {
mLongiText.setText(longi);
}
}
confirmButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Bundle bundle = new Bundle();
bundle.putString(BuildingsDbAdapter.KEY_BUILDINGNAME, mNameText.getText().toString());
bundle.putString(BuildingsDbAdapter.KEY_LAT, mLatText.getText().toString());
bundle.putString(BuildingsDbAdapter.KEY_LONGI, mLongiText.getText().toString());
if (mRowId != null) {
bundle.putLong(BuildingsDbAdapter.KEY_ID, mRowId);
}
Intent mIntent = new Intent();
mIntent.putExtras(bundle);
setResult(RESULT_OK, mIntent);
finish();
}
});
}
}
クラス UDBuildingTour のコード
package com.example.udbuildingtour;
import android.app.ListActivity;
import android.content.Intent;
import android.database.Cursor;
import android.os.Bundle;
import android.widget.SimpleCursorAdapter;
import android.view.ContextMenu;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView.AdapterContextMenuInfo;
import android.widget.ListView;
public class UDBuildingTour extends ListActivity {
private static final int ACTIVITY_CREATE=0;
private static final int ACTIVITY_EDIT=1;
private static final int INSERT_ID = Menu.FIRST;
private static final int DELETE_ID = Menu.FIRST + 1;
private BuildingsDbAdapter mDbHelper;
private Cursor mBuildingsCursor;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.building_edit);
mDbHelper = new BuildingsDbAdapter(this);
mDbHelper.open();
fillData();
registerForContextMenu(getListView());
}
@Override
public boolean onMenuItemSelected(int featureId, MenuItem item) {
switch(item.getItemId()) {
case INSERT_ID:
createBuilding();
return true;
}
return super.onMenuItemSelected(featureId, item);
}
@Override
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) {
super.onCreateContextMenu(menu, v, menuInfo);
menu.add(0, DELETE_ID, 0, R.string.menu_delete);
}
@Override
public boolean onContextItemSelected(MenuItem item) {
switch(item.getItemId()) {
case DELETE_ID:
AdapterContextMenuInfo info = (AdapterContextMenuInfo) item.getMenuInfo();
mDbHelper.deleteBuilding(info.id);
fillData();
return true;
}
return super.onContextItemSelected(item);
}
private void createBuilding() {
Intent i = new Intent(this, BuildingEdit.class);
startActivityForResult(i, ACTIVITY_CREATE);
}
@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
super.onListItemClick(l, v, position, id);
Cursor c = mBuildingsCursor;
c.moveToPosition(position);
Intent i = new Intent(this, BuildingEdit.class);
i.putExtra(BuildingsDbAdapter.KEY_ID, id);
i.putExtra(BuildingsDbAdapter.KEY_BUILDINGNAME, c.getString(
c.getColumnIndexOrThrow(BuildingsDbAdapter.KEY_BUILDINGNAME)));
i.putExtra(BuildingsDbAdapter.KEY_LAT, c.getString(
c.getColumnIndexOrThrow(BuildingsDbAdapter.KEY_LAT)));
i.putExtra(BuildingsDbAdapter.KEY_LONGI, c.getString(
c.getColumnIndexOrThrow(BuildingsDbAdapter.KEY_LONGI)));
startActivityForResult(i, ACTIVITY_EDIT);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
super.onActivityResult(requestCode, resultCode, intent);
Bundle extras = intent.getExtras();
switch(requestCode) {
case ACTIVITY_CREATE:
Long rowId = extras.getLong(BuildingsDbAdapter.KEY_ID);
String name = extras.getString(BuildingsDbAdapter.KEY_BUILDINGNAME);
String lat = extras.getString(BuildingsDbAdapter.KEY_LAT);
String longi = extras.getString(BuildingsDbAdapter.KEY_LONGI);
mDbHelper.createBuilding(rowId, name, lat, longi);
fillData();
break;
case ACTIVITY_EDIT:
Long Id = extras.getLong(BuildingsDbAdapter.KEY_ID);
if (Id != null) {
String editName = extras.getString(BuildingsDbAdapter.KEY_BUILDINGNAME);
String editLat = extras.getString(BuildingsDbAdapter.KEY_LAT);
String editLongi = extras.getString(BuildingsDbAdapter.KEY_LONGI);
mDbHelper.updateBuilding(Id, editName, editLat, editLongi);
}
fillData();
break;
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.udbuilding_tour, menu);
return true;
}
private void fillData() {
// TODO Auto-generated method stub
// Get all of the rows from the database and create the item list
mBuildingsCursor = mDbHelper.fetchAllBuildings();
startManagingCursor(mBuildingsCursor);
// Create an array to specify the fields we want to display in the list (only BUILDINGNAME)
String[] from = new String[]{BuildingsDbAdapter.KEY_BUILDINGNAME};
// and an array of the fields we want to bind those fields to (in this case just text1)
int[] to = new int[]{R.id.text1};
// Now create a simple cursor adapter and set it to display
SimpleCursorAdapter building =
new SimpleCursorAdapter(this, R.layout.buildings_row, mBuildingsCursor, from, to);
setListAdapter(building);
}
}
BuildingsDBAdapter のコード
package com.example.udbuildingtour;
import java.io.BufferedReader;
import java.io.FileReader;
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 BuildingsDbAdapter {
public static final String KEY_ID = "_id";
public static final String KEY_BUILDINGNAME = "name";
public static final String KEY_LAT = "lat";
public static final String KEY_LONGI = "longi";
private static final String TAG = "BuildingsDbAdapter";
private DatabaseHelper mDbHelper;
private SQLiteDatabase mDb;
/**
* Database creation sql statement
*/
private static final String DATABASE_CREATE =
"create table buildings (_id integer primary key autoincrement, "
+ "title text not null, body text not null);";
private static final String DATABASE_NAME = "Buildings";
private static final String DATABASE_TABLE = "UDBuildings";
private static final int DATABASE_VERSION = 1;
private final Context mCtx;
private static class DatabaseHelper extends SQLiteOpenHelper {
DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
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 notes");
onCreate(db);
}
}
/**
* Constructor - takes the context to allow the database to be
* opened/created
*
* @param ctx the Context within which to work
*/
public BuildingsDbAdapter(Context ctx) {
this.mCtx = ctx;
}
public BuildingsDbAdapter open() throws SQLException {
// TODO Auto-generated method stub
mDbHelper = new DatabaseHelper(mCtx);
mDb = mDbHelper.getWritableDatabase();
return this;
}
public void close() {
mDbHelper.close();
}
public boolean deleteBuilding(long id) {
// TODO Auto-generated method stub
return mDb.delete(DATABASE_TABLE, KEY_ID + "=" + id, null) > 0;
}
public long createBuilding(Long id, String name, String lat, String longi) {
// TODO Auto-generated method stub
ContentValues initialValues = new ContentValues();
try{
BufferedReader in = new BufferedReader(new FileReader("UDBuildings.txt"));
String s;
while((s = in.readLine()) != null){
String[] var = s.split(":");
//var[0]=ID,var[1]=Name etc etc
initialValues.put(KEY_BUILDINGNAME, var[1]);
initialValues.put(KEY_LAT, var[2]);
initialValues.put(KEY_LONGI, var[3]);
initialValues.put(KEY_ID, var[0]);
}
}catch(Exception e){
e.printStackTrace();
}
return mDb.insert(DATABASE_TABLE, null, initialValues);
}
/**
* Return a Cursor over the list of all buildings in the database
*
* @return Cursor over all buildings
*/
public Cursor fetchAllBuildings() {
return mDb.query(DATABASE_TABLE, new String[] {KEY_ID, KEY_BUILDINGNAME,
KEY_LAT, KEY_LONGI}, null, null, null, null, null);
}
/**
* Return a Cursor positioned at the building that matches the given building id
*
* @param id of building to retrieve
* @return Cursor positioned to matching building, if found
* @throws SQLException if building could not be found/retrieved
*/
public Cursor fetchBuilding(long id) throws SQLException {
Cursor mCursor =
mDb.query(true, DATABASE_TABLE, new String[] {KEY_ID,
KEY_BUILDINGNAME, KEY_LAT, KEY_LONGI}, KEY_ID + "=" + id, null,
null, null, null, null);
if (mCursor != null) {
mCursor.moveToFirst();
}
return mCursor;
}
/**
* Update the building using the details provided. The building to be updated is
* specified using the id, and it is altered to use the name and lat, longi
* values passed in
*
* @param id of building to update
* @param name value to set building name to
* @param lat value to set building lat to
* @param longi value to set building longi to
* @return true if the building was successfully updated, false otherwise
*/
public boolean updateBuilding(Long rowId, String editName, String editLat, String editLongi) {
// TODO Auto-generated method stub
ContentValues args = new ContentValues();
args.put(KEY_BUILDINGNAME, editName);
args.put(KEY_LAT, editLat);
args.put(KEY_LONGI, editLongi);
return mDb.update(DATABASE_TABLE, args, KEY_ID + "=" + rowId, null) > 0;
}
}
building_edit の xml コード
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="name" />
<EditText android:id="@+id/name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"/>
</LinearLayout>
<TextView android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="lat" />
<EditText android:id="@+id/lat" android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:scrollbars="vertical" />
<TextView android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="longi" />
<EditText android:id="@+id/longi" android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:scrollbars="vertical" />
<Button android:id="@+id/confirm"
android:text="confirm"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
building_row の xml コード
<?xml version="1.0" encoding="utf-8"?>
<TextView android:id="@+id/text1" xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
building_list の xml コード
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<ListView android:id="@+id/android:list"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<TextView android:id="@+id/android:empty"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="no_buildings"/>
</LinearLayout>
androidmanifest.xml ファイル
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.udbuildingtour"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.udbuildingtour.UDBuildingTour"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".BuildingEdit"></activity>
</application>
</manifest>