我正在开发一个带有照片的联系人应用程序。我从 SQLite 存储和检索数据，它在我的列表视图上运行良好。
问题是当我单击一个列表项时，它应该显示图像视图和其他一些细节。但图像未显示在活动上
用户数据库助手.java
package com.example.arif.contacts;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.BitmapDrawable;
import android.util.Log;
public class UserDBHelper extends SQLiteOpenHelper {
String TAG = "DEBUG";
private static final String DATABASE_NAME = "USERINFO.DB";
private static final String TABLE_NAME = "ContactTable";
private static final String TABLE_COL_NAME = "NAME";
private static final String TABLE_COL_MOB = "MOB";
private static final String TABLE_COL_EMAIL = "EMAIL";
private static final String TABLE_COL_IMG = "EMAIL";
private static final String TABLE_COL_ID = "ID";
private static final int DATABASE_VERSION = 1;
private static final String CREATE_QUERY =
"CREATE TABLE "+TABLE_NAME+"("+TABLE_COL_ID+" INTEGER PRIMARY KEY AUTOINCREMENT, "+TABLE_COL_NAME+" TEXT, "+TABLE_COL_MOB+" TEXT, "+TABLE_COL_EMAIL+" TEXT, "+TABLE_COL_IMG+" blob)" ;
public UserDBHelper(Context context)
{
super(context, DATABASE_NAME, null, DATABASE_VERSION);
Log.e("DataBase", "Database created / Opened");
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL(CREATE_QUERY);
Log.e("DataBase", "Table Created");
}
@Override
public void onUpgrade(SQLiteDatabase db, int i, int i1) {
}
public boolean AddInfo(String Name, String Mob , String Email, byte[] img )
{
SQLiteDatabase db = this.getWritableDatabase();
ContentValues CV = new ContentValues();
CV.put("NAME", Name);
CV.put("MOB", Mob);
CV.put("EMAIL", Email );
CV.put("NewImage", img);
long result = db.insert(TABLE_NAME, null,CV);
Log.e("DataBase", "Add Info Bug");
if(result == -1)
{
return false;
}
else
{
return true;
}
}
public Cursor getInformation()
{
Cursor data;
SQLiteDatabase db = this.getWritableDatabase();
String query = "Select * from " + TABLE_NAME;
data = db.rawQuery(query,null);
return data;
}
public String fetch_Name(int i)
{
String Str = "";
SQLiteDatabase db = this.getReadableDatabase();
String query = "Select "+TABLE_COL_NAME+" FROM " + TABLE_NAME + " WHERE " +TABLE_COL_ID+" = "+i;
Cursor data = db.rawQuery(query,null);
if(data.moveToFirst())
{
Str = data.getString(data.getColumnIndex(TABLE_COL_NAME+""));
}
return Str;
}
public String fetch_MOB(int i)
{
String Str = "";
SQLiteDatabase db = this.getReadableDatabase();
String query = "Select "+TABLE_COL_MOB+" FROM " + TABLE_NAME + " WHERE " +TABLE_COL_ID+" = "+i;
Cursor data = db.rawQuery(query,null);
if(data.moveToFirst())
{
Str = data.getString(data.getColumnIndex(TABLE_COL_MOB+""));
}
return Str;
}
public String fetch_Email(int i)
{
String Str = "";
SQLiteDatabase db = this.getReadableDatabase();
String query = "Select "+TABLE_COL_EMAIL+" FROM " + TABLE_NAME + " WHERE " +TABLE_COL_ID+" = "+i;
Cursor data = db.rawQuery(query,null);
if(data.moveToFirst())
{
Str = data.getString(data.getColumnIndex(TABLE_COL_EMAIL+""));
}
return Str;
}
public Bitmap fetch_Img(int i) { /// THIS FUNCTION IS NOT WORKING
byte[] ImgByte;
SQLiteDatabase db = this.getWritableDatabase();
String query = "Select "+TABLE_COL_IMG+" FROM " + TABLE_NAME + " WHERE " +TABLE_COL_ID+" = "+i;
Cursor data = db.rawQuery(query,null);
if(data.moveToFirst())
{
ImgByte = data.getBlob(data.getColumnIndex(TABLE_COL_IMG+""));
Bitmap bitMAP = BitmapFactory.decodeByteArray(ImgByte, 0, ImgByte.length); // Here it's Always Returning Null
if(bitMAP == null)
{
Log.e( TAG, "Bitmap is null :/ ");
}
return bitMAP;
}
return null;
}
}
详细信息查看活动
package com.example.arif.contacts;
import android.content.Intent;
import android.database.sqlite.SQLiteDatabase;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
public class DetailsOfContacts extends AppCompatActivity {
int Pos;
TextView Name_View, Mob_View, Email_View;
ImageView Image_View;
UserDBHelper userDBHelper;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_details_of_contacts);
//---- ---- Intend Bundle ---- ----
Intent intent = getIntent();
Bundle bundle = intent.getExtras();
Pos = -1;
if(bundle != null)
{
Pos = bundle.getInt("Position");
}
Toast.makeText(getApplicationContext(), "Position "+ Pos,Toast.LENGTH_SHORT).show();
// ---- ---- Find View ---- ----
Name_View = (TextView) findViewById(R.id.DetName);
Mob_View = (TextView) findViewById(R.id.DetMob);
Email_View = (TextView) findViewById(R.id.DetEmail);
Image_View = (ImageView) findViewById(R.id.DetImg);
/// --- --- DataBase -----
UserDBHelper userDBHelper = new UserDBHelper(getApplicationContext());
Name_View.setText(userDBHelper.fetch_Name(Pos+1)); // Working Fine
Mob_View.setText(userDBHelper.fetch_MOB(Pos+1));// Working Fine
Email_View.setText(userDBHelper.fetch_Email(Pos+1));// Working Fine
Image_View.setImageBitmap(userDBHelper.fetch_Img(Pos+1)); // it's Not showing The image in activity
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.edit_menu, menu);
return super.onCreateOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id ;
id = item.getItemId();
if(id == R.id.EditButt)
{
Toast.makeText(getApplicationContext(),"Edit Button Clicked", Toast.LENGTH_SHORT).show();
Intent I = new Intent(DetailsOfContacts.this, EditActivity.class);
startActivity(I);
return true;
}
return super.onOptionsItemSelected(item);
}
}
09-18 09:35:56.866 26144-26144/com.example.arif.contacts E/DEBUG: Bitmap is null :/