我是Android的新手,我的应用程序出错了.
我的应用做了以下事情:
1-用户可以选择从相机或图库导入图像.
2-所有图像都保存在数据库中,用户可以在另一个活动的列表视图中查看所有图像.
当我点击菜单栏图标传递到另一个活动,看到应用程序崩溃的所有图像,我在日志文件中收到以下错误:
11-06 15:16:17.199: E/AndroidRuntime(1789): FATAL EXCEPTION: main
11-06 15:16:17.199: E/AndroidRuntime(1789): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.demodbimage/com.example.demodbimage.ImagesList}: java.lang.IllegalStateException: Couldn't read row 0, col 0 from CursorWindow. Make sure the Cursor is initialized correctly before accessing data from it.
MainActivity.java
public class MainActivity extends ActionBarActivity {
private static int FROM_CAMERA = 1;
private static int FROM_GALLERY = 2;
ImageView background;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
background = (ImageView)findViewById(R.id.imgBackground);
DataBaseHandler db = new DataBaseHandler(this);
db.deleteAllContact();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.activity_main_actions, menu);
android.app.ActionBar actionBar = getActionBar();
actionBar.setDisplayHomeAsUpEnabled(true);
return super.onCreateOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
else if(id == R.id.action_camera) {
showOptions();
return true;
}
else if(id == R.id.action_view_as_list) {
Intent i = new Intent(MainActivity.this,ImagesList.class);
startActivity(i);
return true;
}
return super.onOptionsItemSelected(item);
}
public void showOptions(){
final String[] items = {"Camera","Gallery"};
final int[] icons = {R.drawable.ic_camera,R.drawable.ic_gallery};
ListAdapter adapter = new ArrayAdapter<String>( this, R.layout.list_item, items) {
ViewHolder holder;
class ViewHolder {
ImageView icon;
TextView title;
}
public View getView(int position, View convertView, ViewGroup parent) {
final LayoutInflater inflater = (LayoutInflater) getApplicationContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
if (convertView == null) {
convertView = inflater.inflate(R.layout.list_item, null);
holder = new ViewHolder();
holder.icon = (ImageView) convertView .findViewById(R.id.icon);
holder.title = (TextView) convertView .findViewById(R.id.title);
convertView.setTag(holder);
} else {
// view already defined, retrieve view holder
holder = (ViewHolder) convertView.getTag();
}
holder.title.setText(items[position]);
holder.icon.setImageResource(icons[position]);
return convertView;
}
};
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("Choose photo from:");
builder.setAdapter(adapter, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
if(which == 0){
Intent fromCamera = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(fromCamera, FROM_CAMERA);
}
else{
Intent i = new Intent(Intent.ACTION_GET_CONTENT);
i.setType("image/*");
startActivityForResult(i, FROM_GALLERY);
}
}
});
builder.create();
builder.show();
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data){
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == FROM_GALLERY && resultCode == RESULT_OK && null != data) {
Uri selectedImage = data.getData();
String[] filePathColumn = { MediaStore.Images.Media.DATA };
Cursor cursor = getContentResolver().query(selectedImage, filePathColumn, null, null, null);
cursor.moveToFirst();
int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
String picturePath = cursor.getString(columnIndex);
cursor.close();
background.setImageBitmap(BitmapFactory.decodeFile(picturePath));
insertToDatabase(BitmapFactory.decodeFile(picturePath));
}
else{
if(requestCode == FROM_CAMERA && resultCode == RESULT_OK && null != data )
{
Bundle extras = data.getExtras();
Bitmap photo = extras.getParcelable("data");
background.setImageBitmap(photo);
insertToDatabase(photo);
}
}
}
public void insertToDatabase(Bitmap img){
DataBaseHandler db = new DataBaseHandler(this);
//db.deleteAllContact();
// get image from drawable
//Drawable i = background.getBackground();
//Bitmap image = ((BitmapDrawable)i).getBitmap();
//Bitmap image = BitmapFactory.decodeResource(getResources(),R.id.imgBackground);
// convert bitmap to byte
ByteArrayOutputStream stream = new ByteArrayOutputStream();
img.compress(Bitmap.CompressFormat.JPEG, 100, stream);
byte imageInByte[] = stream.toByteArray();
//Inserting Contacts
Log.d("Insert: ", "Inserting ..");
db.addContact(new Contact("Image", imageInByte));
}
}
DataBaseHandler.java
public class DataBaseHandler extends SQLiteOpenHelper{
private static final int DATABASE_VERSION = 1;
private static final String DATABASE_NAME = "imagedb";
private static final String TABLE_CONTACTS = "contacts";
private static final String KEY_ID = "id";
private static final String KEY_NAME = "name";
private static final String KEY_IMAGE = "image";
public DataBaseHandler(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
String CREATE_CONTACTS_TABLE = "CREATE TABLE " + TABLE_CONTACTS + "("
+ KEY_ID + " INTEGER PRIMARY KEY," + KEY_NAME + " TEXT,"
+ KEY_IMAGE + " BLOB" + ")";
db.execSQL(CREATE_CONTACTS_TABLE);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// Drop older table if existed
db.execSQL("DROP TABLE IF EXISTS " + TABLE_CONTACTS);
// Create tables again
onCreate(db);
}
// Adding new contact
public void addContact(Contact contact) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_NAME, contact._name); // Contact Name
values.put(KEY_IMAGE, contact._image); // Contact Phone
// Inserting Row
db.insert(TABLE_CONTACTS, null, values);
db.close(); // Closing database connection
}
// Getting single contact
Contact getContact(int id) {
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.query(TABLE_CONTACTS, new String[] { KEY_ID,
KEY_NAME, KEY_IMAGE }, KEY_ID + "=?",
new String[] { String.valueOf(id) }, null, null, null, null);
if (cursor != null)
cursor.moveToFirst();
Contact contact = new Contact(Integer.parseInt(cursor.getString(0)),
cursor.getString(1), cursor.getBlob(1));
// return contact
return contact;
}
// Getting All Contacts
public List<Contact> getAllContacts() {
List<Contact> contactList = new ArrayList<Contact>();
// Select All Query
String selectQuery = "SELECT * FROM contacts ORDER BY name";
SQLiteDatabase db = this.getWritableDatabase();
Cursor cursor = db.rawQuery(selectQuery, null);
// looping through all rows and adding to list
if (cursor.moveToFirst()) {
do {
Contact contact = new Contact();
contact.setID(Integer.parseInt(cursor.getString(0)));
contact.setName(cursor.getString(1));
contact.setImage(cursor.getBlob(2));
// Adding contact to list
contactList.add(contact);
} while (cursor.moveToNext());
}
// close inserting data from database
db.close();
// return contact list
return contactList;
}
// Updating single contact
public int updateContact(Contact contact) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_NAME, contact.getName());
values.put(KEY_IMAGE, contact.getImage());
// updating row
return db.update(TABLE_CONTACTS, values, KEY_ID + " = ?",
new String[] { String.valueOf(contact.getID()) });
}
// Deleting single contact
public void deleteContact(Contact contact) {
SQLiteDatabase db = this.getWritableDatabase();
db.delete(TABLE_CONTACTS, KEY_ID + " = ?",
new String[] { String.valueOf(contact.getID()) });
db.close();
}
public void deleteAllContact() {
SQLiteDatabase db = this.getWritableDatabase();
db.delete(TABLE_CONTACTS,null,null);
db.close();
}
// Getting contacts Count
public int getContactsCount() {
String countQuery = "SELECT * FROM " + TABLE_CONTACTS;
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.rawQuery(countQuery, null);
cursor.close();
// return count
return cursor.getCount();
}
}
ImagesList.java
public class ImagesList extends Activity{
ArrayList<Contact> imageArry = new ArrayList<Contact>();
ContactImageAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState){
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.image_list);
ListView dataList = (ListView) findViewById(R.id.listView1);
DataBaseHandler db = new DataBaseHandler(this);
// Reading all contacts from database
List<Contact> contacts = db.getAllContacts();
for (Contact cn : contacts) {
String log = "ID:" + cn.getID() + " Name: " + cn.getName() + " ,Image: " + cn.getImage();
// Writing Contacts to log
Log.d("Result: ", log);
//add contacts data in arrayList
imageArry.add(cn);
}
adapter = new ContactImageAdapter(this,R.layout.layout_row,imageArry);
dataList.setAdapter(adapter);
}
}
image_list.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<ListView
android:id="@+id/listView1"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</ListView>
</LinearLayout>
列表视图中每行的layout_row.xml布局
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<ImageView
android:id="@+id/imageView1"
android:layout_width="100dp"
android:layout_height="100dp"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginTop="10dp"
android:paddingBottom="10dp"
android:src="@drawable/ic_gallery" />
<TextView
android:id="@+id/tvImageName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/imageView1"
android:layout_marginBottom="18dp"
android:layout_toRightOf="@+id/imageView1"
android:text="The name of the image"
android:textAppearance="?android:attr/textAppearanceMedium" />
</RelativeLayout>
我花了很多时间搜索解决方案,但没找到.
谢谢你的到来!!!
完整的日志文件:
11-06 15:16:17.199: E/AndroidRuntime(1789): FATAL EXCEPTION: main
11-06 15:16:17.199: E/AndroidRuntime(1789): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.demodbimage/com.example.demodbimage.ImagesList}: java.lang.IllegalStateException: Couldn't read row 0, col 0 from CursorWindow. Make sure the Cursor is initialized correctly before accessing data from it.
11-06 15:16:17.199: E/AndroidRuntime(1789): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2351)
11-06 15:16:17.199: E/AndroidRuntime(1789): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2403)
11-06 15:16:17.199: E/AndroidRuntime(1789): at android.app.ActivityThread.access$600(ActivityThread.java:165)
11-06 15:16:17.199: E/AndroidRuntime(1789): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1373)
11-06 15:16:17.199: E/AndroidRuntime(1789): at android.os.Handler.dispatchMessage(Handler.java:107)
11-06 15:16:17.199: E/AndroidRuntime(1789): at android.os.Looper.loop(Looper.java:194)
11-06 15:16:17.199: E/AndroidRuntime(1789): at android.app.ActivityThread.main(ActivityThread.java:5391)
11-06 15:16:17.199: E/AndroidRuntime(1789): at java.lang.reflect.Method.invokeNative(Native Method)
11-06 15:16:17.199: E/AndroidRuntime(1789): at java.lang.reflect.Method.invoke(Method.java:525)
11-06 15:16:17.199: E/AndroidRuntime(1789): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:833)
11-06 15:16:17.199: E/AndroidRuntime(1789): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
11-06 15:16:17.199: E/AndroidRuntime(1789): at dalvik.system.NativeStart.main(Native Method)
*
Jan*_*pan 10
而不只是查看logcat中的错误,请查看警告.我相信您会看到类似于以下内容的警告:
WARN CursorWindow Window is full: requested allocation x bytes, free space x bytes, window size x bytes
这意味着您的游标对象大于分配的大小,通常为2Mb.您的光标正在加载几个图像/ blob,这可能会导致它大于2Mb.
1 - 逐个阅读图像.而不是执行选择所有内容的查询,例如SELECT*FROM contacts ...将其更改为通过索引结果一次读取一个或两个图像.您可以通过查看图像的大小来锻炼所需的空间.
2 - 不要将图像保存在数据库中.最好将图像保存在SD卡上的目录中,然后将URI保存到数据库中并将其读入光标.然后将图像解码留给你的应用程序,它比你的光标对象有更多的内存.
我已经添加了注释并修改了代码,以便更容易理解.
//This is the part of my Sync method where I start pulling images from the database.
if(isSyncNeeded)
{
android.util.Log.w(" CURSOR FIXES ", "BEGIN...");
databaseHelperimages = new Handler_Database(Screen_Main.this);
SQLiteDatabase dbimages = databaseHelperimages.getReadableDatabase();
//I store my data in arraylists when I read the from the db.
Session.arraylist_pictures_1 = new ArrayList<String>();
Session.arraylist_pictures_2 = new ArrayList<String>();
//Do all your reading here...
// I have another query before this where I get the id of each row in my database. And here, I say, for each id in my database, get the corresponding image in that row.
for (String id : Session.arraylist_allsubmissions_id)
{
Cursor c1 = dbimages.rawQuery("SELECT picture1 FROM submissions WHERE id" + " = " + id, null);
if(c1.getCount() > 0)
{
if(c1.moveToFirst())
{
do
{
try
{
int index = c1.getColumnIndex("picture1");
String entry = c1.getString(index);
Session.arraylist_pictures_1.add(entry);
}
catch (IllegalStateException e)
{
//Do Nothing
}
catch (NullPointerException e)
{
//Do Nothing
}
}
while(c1.moveToNext());
}
}
c1.close();
Cursor c2 = dbimages.rawQuery("SELECT picture2 FROM submissions WHERE id" + " = " + id, null);
if(c2.getCount() > 0)
{
if(c2.moveToFirst())
{
do
{
try
{
int index = c2.getColumnIndex("picture2");
String entry = c2.getString(index);
Session.arraylist_pictures_2.add(entry);
}
catch (IllegalStateException e)
{
//Do Nothing
}
catch (NullPointerException e)
{
//Do Nothing
}
}
while(c2.moveToNext());
}
}
c2.close();
//Continue doing this for all your images.
}
databaseHelperimages.close();
dbimages.close();
android.util.Log.w(" CURSOR FIXES ", "END...");
}
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