如何从数据库中获取图像而没有错误？
[英]How can I get an image from the Database without error?
问题描述
我使用Facebook登录，掌握了配置文件图像，将其保存在数据库中，然后尝试恢复数据库图像，然后在ImageView进行设置，但无法正常工作。
我想了解原因，可能还有解决方案。
Logcat错误：
java.lang.RuntimeException: Unable to start activity ComponentInfo{br.com.***/br.com.****}: android.database.CursorIndexOutOfBoundsException: Index -1 requested, with a size of 0
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2059)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
at android.app.ActivityThread.access$600(ActivityThread.java:130)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4745)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
Caused by: android.database.CursorIndexOutOfBoundsException: Index -1 requested, with a size of 0
活动：
public class Perfil extends ActionBarActivity {
Database databaseHelper;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_perfil);
databaseHelper = new Database(this);
TextView name = (TextView)findViewById(R.id.nameSurname);
ImageView img = (ImageView)findViewById(R.id.imageTestePerfil);
byte[] teste = databaseHelper.getImage();
Bitmap bitmap = BitmapFactory. decodeByteArray(teste, 0, teste.length);
img.setImageBitmap(bitmap);
}}
布局：
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:fitsSystemWindows="true"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:background="#ff6600"
tools:context="br.com.***.Perfil">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/imageTestePerfil"
android:layout_below="@+id/app_bar"
android:layout_centerHorizontal="true"
android:layout_marginTop="47dp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Name Surname"
android:id="@+id/nameSurname"
android:layout_marginTop="75dp"
android:layout_below="@+id/imageTestePerfil"
android:layout_centerHorizontal="true" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="Idade Perfil"
android:id="@+id/idadePerfil"
android:layout_below="@+id/nameSurname"
android:layout_alignRight="@+id/textView8"
android:layout_alignEnd="@+id/textView8" />
<RatingBar
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/ratingBar"
android:layout_below="@+id/idadePerfil"
android:layout_centerHorizontal="true"
android:layout_marginTop="56dp" />
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/imageView6"
android:src="@drawable/progressbar"
android:layout_below="@+id/ratingBar"
android:layout_centerHorizontal="true" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="7° colocado"
android:id="@+id/textView7"
android:layout_marginTop="62dp"
android:layout_below="@+id/imageView6"
android:layout_alignLeft="@+id/idadePerfil"
android:layout_alignStart="@+id/idadePerfil" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall"
android:text="150 assertos"
android:id="@+id/textView8"
android:layout_below="@+id/textView7"
android:layout_centerHorizontal="true"
android:layout_marginTop="52dp" />
</RelativeLayout>
数据库：
public class Database {
DatabaseHelper helper;
public Database(Context context){
helper = new DatabaseHelper(context);
}
public long insertData(String name, String idade, byte[] image){
SQLiteDatabase db = helper.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put(DatabaseHelper.NAME, name);
contentValues.put(DatabaseHelper.IDADE, idade);
contentValues.put(DatabaseHelper.IMAGE, image);
long id = db.insert(DatabaseHelper.TABLE_NAME, null, contentValues);
return id;
}
public byte[] getImage(){
//select name, password from vivztable where name = 'anky';
SQLiteDatabase db = helper.getWritableDatabase();
String[] columns = {DatabaseHelper.IMAGE};
Cursor cursor = db.query(DatabaseHelper.TABLE_NAME, columns, null, null, null, null, null);
StringBuffer buffer = new StringBuffer();
byte[] personImage = cursor.getBlob(2); //////THIS LINE IS GIVING ERROR
return personImage;
}
public String getAllData(){
SQLiteDatabase db = helper.getWritableDatabase();
String[] columns = {DatabaseHelper.UID, DatabaseHelper.NAME, DatabaseHelper.IDADE};
Cursor cursor = db.query(DatabaseHelper.TABLE_NAME, columns, null, null, null, null, null);
StringBuffer buffer = new StringBuffer();
while (cursor.moveToNext()){
int cid = cursor.getInt(0);
String name = cursor.getString(1);
String idade = cursor.getString(2);
buffer.append(cid+""+name+""+idade+"\n");
}
return buffer.toString();
}
public String getName(){
//select name, password from vivztable where name = 'anky';
SQLiteDatabase db = helper.getWritableDatabase();
String[] columns = {DatabaseHelper.NAME};
Cursor cursor = db.query(DatabaseHelper.TABLE_NAME, columns, null, null, null, null, null);
StringBuffer buffer = new StringBuffer();
//DatabaseHelper.NAME+" = '"+name+"'"
cursor.moveToLast();
int index1 = cursor.getColumnIndex(DatabaseHelper.NAME);
String personName = cursor.getString(index1);
buffer.append(personName);
return buffer.toString();
}
public String getIdade(){
//select name, password from vivztable where name = 'anky';
SQLiteDatabase db = helper.getWritableDatabase();
String[] columns = {DatabaseHelper.IDADE};
Cursor cursor = db.query(DatabaseHelper.TABLE_NAME, columns, null, null, null, null, null);
StringBuffer buffer = new StringBuffer();
//DatabaseHelper.NAME+" = '"+name+"'"
cursor.moveToLast();
int index1 = cursor.getColumnIndex(DatabaseHelper.IDADE);
String idade = cursor.getString(index1);
buffer.append(idade);
return buffer.toString();
}
static class DatabaseHelper extends SQLiteOpenHelper{
private static final String UID = "_id";
private static final String NAME = "name";
private static final String IDADE = "idade";
private static final String EMAIL = "email";
private static final String IMAGE = "image";
private static final String DATABASE_NAME = "perfildatabase";
private static final String TABLE_NAME = "PERFILTABLE";
private static final int DATABASE_VERSION = 1;
private static final String CREATE_TABLE = "create table "+ TABLE_NAME + " ("+UID+" integer primary key autoincrement, "+ NAME + " VARCHAR (255), "+ IDADE + " VARCHAR (255), "+ IMAGE + " BLOB);";
private static final String DROP_TABLE = "DROP TABLE IF EXISTS "+TABLE_NAME;
private Context context;
//MeuOpenHelper openHelper;
//SQLiteDatabase db;
public DatabaseHelper(Context context){
super(context, DATABASE_NAME, null, DATABASE_VERSION);
this.context=context;
Message.message(context, "constructor called");
}
/**
private class MeuOpenHelper extends SQLiteOpenHelper {
MeuOpenHelper(Context context){
super(context, NAME_BANCO, null, VERSAO_BANCO);
}
**/
@Override
public void onCreate(SQLiteDatabase db){
try {
db.execSQL(CREATE_TABLE);
Message.message(context, "onCreate called");
} catch (SQLException e){
Message.message(context,""+e);
}
}
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion){
try {
db.execSQL(DROP_TABLE);
onCreate(db);
Message.message(context, "onUpgrade called");
} catch (SQLException e){
Message.message(context,""+e);
}
}
}
}
Facebook登录代码：
public class MainFragment extends android.support.v4.app.Fragment {
private Database databaseHelper;
private AccessTokenTracker mTokenTracker;
private ProfileTracker mProfileTracker;
private TextView mTextDetails;
private ImageView imageTeste;
private CallbackManager mCallbackManager;
private FacebookCallback<LoginResult> mCallback = new FacebookCallback<LoginResult>() {
@Override
public void onSuccess(LoginResult loginResult) {
AccessToken accessToken = loginResult.getAccessToken();
Profile profile = Profile.getCurrentProfile();
displayWelcomeMessage(profile);
}
@Override
public void onCancel() {
}
@Override
public void onError(FacebookException e) {
}
};
public MainFragment() {
// Required empty public constructor
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
FacebookSdk.sdkInitialize(getActivity().getApplicationContext());
mCallbackManager = CallbackManager.Factory.create();
AccessTokenTracker tracker = new AccessTokenTracker() {
@Override
protected void onCurrentAccessTokenChanged(AccessToken old, AccessToken newToken) {
}
};
ProfileTracker profileTracker = new ProfileTracker() {
@Override
protected void onCurrentProfileChanged(Profile oldProfile, Profile newProfile) {
//displayWelcomeMessage(newProfile);
}
};
tracker.startTracking();
profileTracker.startTracking();
}
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
LoginButton loginButton = (LoginButton)view.findViewById(R.id.login_button);
loginButton.setReadPermissions("user_friends");
loginButton.setFragment(this);
loginButton.registerCallback(mCallbackManager, mCallback);
//mTextDetails = (TextView) view.findViewById(R.id.text_details);
imageTeste = (ImageView) view.findViewById(R.id.imageTeste);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_main, container, false);
}
public void displayWelcomeMessage(Profile profile){
if (profile != null){
databaseHelper = new Database(getActivity());
String name = profile.getName();
String idade = profile.getLastName();
String userIds = profile.getId();
Bitmap b = ((BitmapDrawable)imageTeste.getDrawable()).getBitmap();
int bytes = b.getWidth()*b.getHeight()*4;
ByteBuffer buffer = ByteBuffer.allocate(bytes); //Create a new buffer
b.copyPixelsToBuffer(buffer); //Move the byte data to the buffer
byte[] image = buffer.array();
long id = databaseHelper.insertData(name, idade, image);
if(id < 0){
Message.message(getActivity(), "Unsuccessful");
} else{
Message.message(getActivity(), "Successfully Inserted a Row");
}
}
}
public Bitmap getUserPic(String userID) {
String imageURL;
Bitmap bitmap = null;
//Log.d(TAG, "Loading Picture");
imageURL = "http://graph.facebook.com/"+userID+"/picture?type=small";
try {
bitmap = BitmapFactory.decodeStream((InputStream)new URL(imageURL).getContent());
} catch (Exception e) {
Log.d("TAG", "Loading Picture FAILED");
e.printStackTrace();
}
return bitmap;
}
@Override
public void onResume() {
super.onResume();
Profile profile = Profile.getCurrentProfile();
displayWelcomeMessage(profile);
}
@Override
public void onStop() {
super.onStop();
//mTokenTracker.stopTracking();
//mProfileTracker.stopTracking();
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
mCallbackManager.onActivityResult(requestCode, resultCode, data);
}
}
1 个解决方案
解决方案1
0 2015-06-10 19:59:25
在访问光标之前，将光标移到开头：
public byte[] getImage(){
SQLiteDatabase db = helper.getReadableDatabase();
String[] columns = {DatabaseHelper.IMAGE};
Cursor cursor = db.query(DatabaseHelper.TABLE_NAME, columns, null, null, null, null, null);
if (cursor.moveToFirst()) {
return cursor.getBlob(cursor.getColumnIndex(DatabaseHelper.IMAGE));
}
return null;
}
并在访问返回值之前检查是否为空值。
在您的活动中：
byte[] teste = databaseHelper.getImage();
if (teste != null) {
Bitmap bitmap = BitmapFactory. decodeByteArray(teste, 0, teste.length);
img.setImageBitmap(bitmap);
}
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