android如何添加瀏覽按鈕？

Question

我跟着this tutorial。

這有助於我在數據庫中插入圖像。但是這個代碼一次又一次地插入硬編碼的相同圖像到數據庫中。

如何修改此代碼以允許我通過單擊瀏覽按鈕和我自己選擇的textview從內存上傳我選擇的照片？

import java.io.ByteArrayOutputStream; 
    import java.util.ArrayList; 
    import java.util.List; 

    import android.app.Activity; 
    import android.graphics.Bitmap; 
    import android.graphics.BitmapFactory; 
    import android.os.Bundle; 
    import android.util.Log; 
    import android.widget.ListView; 

    public class SQLiteDemoActivity extends Activity { 
    ArrayList<Contact> imageArry = new ArrayList<Contact>(); 
    ContactImageAdapter adapter; 

    /** Called when the activity is first created. */ 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 

    DataBaseHandler db = new DataBaseHandler(this); 
    //get image from drawable 
    Bitmap image = BitmapFactory.decodeResource(getResources(), 
    R.drawable.facebook); 

    //convert bitmap to byte 
    ByteArrayOutputStream stream = new ByteArrayOutputStream(); 
    image.compress(Bitmap.CompressFormat.JPEG, 100, stream); 
    byte imageInByte[] = stream.toByteArray(); 
    /** 
    * CRUD Operations 
    * */ 
    //Inserting Contacts 
    Log.d("Insert: ", "Inserting .."); 
    db.addContact(new Contact("FaceBook", imageInByte)); 
    //display main List view bcard and contact name 

    //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.screen_list, 
    imageArry); 
    ListView dataList = (ListView) findViewById(R.id.list); 
    dataList.setAdapter(adapter); 
    } 
    } 










     public class Contact { 

// private variables 
int _id; 
String _name; 
byte[] _image; 

// Empty constructor 
public Contact() { 

} 

// constructor 
public Contact(int keyId, String name, byte[] image) { 
this._id = keyId; 
this._name = name; 
this._image = image; 

} 

// constructor 
public Contact(String contactID, String name, byte[] image) { 
this._name = name; 
this._image = image; 

} 

// constructor 
public Contact(String name, byte[] image) { 
this._name = name; 
this._image = image; 
} 

// getting ID 
public int getID() { 
return this._id; 
} 

// setting id 
public void setID(int keyId) { 
this._id = keyId; 
} 

// getting name 
public String getName() { 
return this._name; 
} 

// setting name 
public void setName(String name) { 
this._name = name; 
} 

// getting phone number 
public byte[] getImage() { 
return this._image; 
} 

// setting phone number 
public void setImage(byte[] image) { 
this._image = image; 
} 









import java.io.ByteArrayInputStream; 
    import java.util.ArrayList; 

    import android.app.Activity; 
import android.content.Context; 
import android.graphics.Bitmap; 
import android.graphics.BitmapFactory; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.ArrayAdapter; 
import android.widget.ImageView; 
import android.widget.TextView; 

    public class ContactImageAdapter extends ArrayAdapter<Contact>{ 
    Context context; 
    int layoutResourceId; 
    //BcardImage data[] = null; 
ArrayList<Contact> data=new ArrayList<Contact>(); 
public ContactImageAdapter(Context context, int layoutResourceId, 
ArrayList<Contact> data) { 
super(context, layoutResourceId, data); 
this.layoutResourceId = layoutResourceId; 
this.context = context; 
this.data = data; 
} 

@Override 
public View getView(int position, View convertView, ViewGroup parent) { 
View row = convertView; 
ImageHolder holder = null; 
if(row == null) 
{ 
LayoutInflater inflater = ((Activity)context).getLayoutInflater(); 
row = inflater.inflate(layoutResourceId, parent, false); 
holder = new ImageHolder(); 
holder.txtTitle = (TextView)row.findViewById(R.id.txtTitle); 
    holder.imgIcon = (ImageView)row.findViewById(R.id.imgIcon); 
    row.setTag(holder); 
} 
    else 
{ 
    holder = (ImageHolder)row.getTag(); 
    } 
Contact picture = data.get(position); 
holder.txtTitle.setText("facebook"); 
//convert byte to bitmap take from contact class 
byte[] outImage=picture._image; 
ByteArrayInputStream imageStream = new ByteArrayInputStream(outImage); 
Bitmap theImage = BitmapFactory.decodeStream(imageStream); 
    holder.imgIcon.setImageBitmap(theImage); 
return row; 
    } 
static class ImageHolder 
    { 
ImageView imgIcon; 
TextView txtTitle; 
} 
} 






     import java.io.ByteArrayInputStream; 
    import java.util.ArrayList; 

import android.app.Activity; 
import android.content.Context; 
import android.graphics.Bitmap; 
import android.graphics.BitmapFactory; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.ArrayAdapter; 
import android.widget.ImageView; 
import android.widget.TextView; 

    public class ContactImageAdapter extends ArrayAdapter<Contact>{ 
Context context; 
    int layoutResourceId; 
//BcardImage data[] = null; 
ArrayList<Contact> data=new ArrayList<Contact>(); 
public ContactImageAdapter(Context context, int layoutResourceId, 
ArrayList<Contact> data) { 
super(context, layoutResourceId, data); 
this.layoutResourceId = layoutResourceId; 
this.context = context; 
    this.data = data; 
    } 

@Override 
    public View getView(int position, View convertView, ViewGroup parent) { 
View row = convertView; 
    ImageHolder holder = null; 
    if(row == null) 
    { 
    LayoutInflater inflater = ((Activity)context).getLayoutInflater(); 
    row = inflater.inflate(layoutResourceId, parent, false); 
    holder = new ImageHolder(); 
    holder.txtTitle = (TextView)row.findViewById(R.id.txtTitle); 
    holder.imgIcon = (ImageView)row.findViewById(R.id.imgIcon); 
     row.setTag(holder); 
    } 
    else 
    { 
    holder = (ImageHolder)row.getTag(); 
} 
    Contact picture = data.get(position); 
    holder.txtTitle.setText("facebook"); 
    //convert byte to bitmap take from contact class 
    byte[] outImage=picture._image; 
    B yteArrayInputStream imageStream = new ByteArrayInputStream(outImage); 
    Bitmap theImage = BitmapFactory.decodeStream(imageStream); 
    holder.imgIcon.setImageBitmap(theImage); 
    return row; 
    } 
    static class ImageHolder 
    { 
    ImageView imgIcon; 
    TextView txtTitle; 
    } 
     } 

Answer 1

你應該閱讀本主題使用畫廊選擇圖像，然後將其插入到數據庫： How to pick an image from gallery (SD Card) for my app?