我希望我的Android应用程序在用户单击“全部列出”按钮时将文本文件的内容显示到虚拟表上。我使用来自developer.android网站的示例创建虚拟表。该程序目前无法运行。下面是我正在使用的代码和文本文件的示例。请告诉我可能出了问题。非常感谢。
CEMMainActivity.java
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.app.ListActivity;
import android.app.SearchManager;
import android.content.Context;
import android.content.Intent;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.SimpleCursorAdapter;
import android.os.Build;
import android.provider.ContactsContract;
public class CEMMainActivity extends ActionBarActivity {
protected static final String FTS_TABLE_CREATE = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_cemmain);
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
}
.add(R.id.container, new PlaceholderFragment()).commit();
}
//Action once Find button is clicked
Button findequip = (Button)findViewById(R.id.findequip);
findequip.setOnClickListener(new OnClickListener() {
public void onClick(View f) {
public void onCreate(SQLiteDatabase list) {
SQLiteDatabase mDatabase = list;
mDatabase.execSQL(FTS_TABLE_CREATE);
loadEquipmentList();
}
}
});
fragment_cemmain.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="clinical.equipment.monitor.CEMMainActivity$PlaceholderFragment" >
.......
<Button
android:id="@+id/listallequip"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/cleartext"
android:layout_toRightOf="@+id/equipid"
android:onClick="listallequip"
android:text="@string/listallequip" />
</RelativeLayout>
DatabaseOpenHelper.java
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import android.content.Context;
import android.content.res.Resources;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.text.TextUtils;
import android.util.Log;
public class DatabaseOpenHelper {
private static final String TAG = "ListAllEquipment";
//The columns to be included in table
public static final String COL_TYPE = "EQUIPMENT TYPE";
public static final String COL_ID = "ID";
public static final String COL_LOCATION = "LOCATION";
public static final String COL_STATUS = "STATUS";
public static final String COL_TIME = "TIME";
private static final String DATABASE_NAME = "EQUIPMENT LIST";
private static final String FTS_VIRTUAL_TABLE = "FTS";
private static final int DATABASE_VERSION = 1;
private final DatabaseOpenHelper mDatabaseOpenHelper;
public DatabaseOpenHelper(Context context) {
// TODO Auto-generated constructor stub
}
public void Listalldatabase (Context context) {
mDatabaseOpenHelper = new DatabaseOpenHelper(context);
private static class DatabaseOpenHelper extends SQLiteOpenHelper {
private final Context mHelperContext;
private SQLiteDatabase mDatabase;
private static final String FTS_TABLE_CREATE =
"CREATE VIRTUAL TABLE " + FTS_VIRTUAL_TABLE +
" USING fts3 (" +
COL_TYPE + ", " +
COL_ID + ", " + COL_LOCATION + ", " + COL_STATUS +", " + COL_TIME + ")";
DatabaseOpenHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
mHelperContext = context;
}
// populate the virtual table
private void loadEquipmentList() {
new Thread(new Runnable() {
public void run() {
try {
loadType();
} catch (IOException e) {
throw new RuntimeException(e);
}
}
}).start();
}
private void loadType() throws IOException {
final Resources resources = mHelperContext.getResources();
InputStream inputStream = resources.openRawResource(R.raw.info_sample);
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
try {
String line;
while ((line = reader.readLine()) != null) {
String[] strings = TextUtils.split(line, "-");
if (strings.length < 5) continue;
long list = addItem(strings[0].trim(), strings[1].trim(), strings[2].trim(), strings[3].trim(), strings[4].trim());
if (list < 0) {
Log.e(TAG, "unable to add word: " + strings[0].trim());
}
}
} finally {
reader.close();
}
public long addItem (String type; String id; String location; String status; String time) {
ContentValues initialValues = new ContentValues();
initialValues.put(COL_TYPE, type);
initialValues.put(COL_ID, id);
initialValues.put(COL_LOCATION, location);
initialValues.put(COL_STATUS, status);
initialValues.put(COL_TIME, time);
return mDatabase.insert(FTS_VIRTUAL_TABLE, null, initialValues);
}
}
}
@Override
public void onUpgrade(SQLiteDatabase list, int oldVersion, int newVersion) {
Log.w(TAG, "Upgrading database from version " + oldVersion + " to "
+ newVersion + ", which will destroy all old data");
list.execSQL("DROP TABLE IF EXISTS " + FTS_VIRTUAL_TABLE);
onCreate(list);
}
}
}
info_sample.txt
Equipment Type Equipment ID Location Status Time
Infusion Pump 1234 2 On 12:00
Hoist 3645 1 Off 13:00
Bed 2563 3 Occupied 14:00
最佳答案
改变这个
setContentView(R.layout.activity_cemmain);
至
setContentView(R.layout.fragment_cemmain);
因为
Button在fragment_cemmain.xml中，所以setContentView应该引用fragment_cemmain.xml并删除
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment()).commit();
}