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package com.example.li.photo_pick;
import android.annotation.TargetApi;
import android.content.ContentResolver;
import android.content.ContentUris;
import android.content.ContentValues;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.BitmapDrawable;
import android.net.Uri;
import android.os.Build;
import android.provider.DocumentsContract;
import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.ImageView;
import android.widget.Toast;
import java.io.ByteArrayOutputStream;
import java.io.FileNotFoundException;
import java.nio.ByteBuffer;
public class MainActivity extends AppCompatActivity {
private SQLiteDatabase db;
private PictureDatabase pictureDatabase;
private Context mContext;
//private static final int CHOOSE_PHOTO = 0;
private ImageView imageView;
private ImageView imgShow;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
imageView = findViewById(R.id.imgView);
imgShow = findViewById(R.id.imgShow);
mContext = MainActivity.this;
pictureDatabase = new PictureDatabase(mContext);
}
public void openAlbum(View view) {
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(intent,1);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if(resultCode==RESULT_OK){
Uri uri=data.getData();
ContentResolver cr=this.getContentResolver();
Bitmap bitmap=null;
Bundle extras=null;
if(requestCode==1){
String[] proj ={MediaStore.Images.Media.DATA};
Cursor actualimagecursor=managedQuery(uri,proj,null,null,null);
int actual_image_column_index=actualimagecursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
actualimagecursor.moveToFirst();
String path=actualimagecursor.getString(actual_image_column_index);
try{
bitmap=BitmapFactory.decodeStream(cr.openInputStream(uri));
}catch(FileNotFoundException e){
e.printStackTrace();
}
imageView.setImageBitmap(bitmap);
}
}
}
/**
* 将图片存放入数据库
* 从image view中获取图片源bitmap,转为二进制数组存储
* @param view
*/
public void saveToDatabase(View view){
imageView.setDrawingCacheEnabled(true);
Bitmap bitmap = imageView.getDrawingCache();
imageView.setDrawingCacheEnabled(false);
db = pictureDatabase.getWritableDatabase();
ContentValues cv = new ContentValues();
cv.put("pic", getPicture(bitmap));
db.insert("picture", null, cv);
Toast.makeText(this,"fuck you!",Toast.LENGTH_SHORT).show();
}
//将Bitmap转换成可以用来存储的byte[]类型,采用ByteBuffer实现
private byte[] getPicture(Bitmap bitmap) {
ByteBuffer buffer = ByteBuffer.allocate(bitmap.getByteCount());
return buffer.array();
}
public void imgShow(View view){
db = pictureDatabase.getReadableDatabase();
Cursor cursor = db.query("picture",null,null,null,null,
null,null);
byte[] imgByte = null;
if(cursor.moveToNext()){
imgByte = cursor.getBlob(cursor.getColumnIndex("pic"));
}
Bitmap bitmap = BitmapFactory.decodeByteArray(imgByte,0,imgByte.length);
imgShow.setImageBitmap(bitmap);
}
}
package com.example.li.photo_pick;
import android.content.ContentValues;
import android.content.Context;
import android.content.res.Resources;
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.graphics.drawable.Drawable;
import android.provider.BaseColumns;
import java.io.ByteArrayOutputStream;
public class PictureDatabase extends SQLiteOpenHelper {
//数据库名
private static final String DATABASE_NAME = "picture.db";
//数据库版本号
private static final int DATABASE_Version = 1;
//表名
//private static final String TABLE_NAME = "picture";
//创建数据库
public PictureDatabase (Context context) {
super(context, DATABASE_NAME, null, DATABASE_Version);
}
//创建表并初始化表
@Override
public void onCreate (SQLiteDatabase db) {
db.execSQL("CREATE TABLE picture(PID INTEGER PRIMARY KEY AUTOINCREMENT,pic blob not null)");
}
//更新数据库
@Override
public void onUpgrade (SQLiteDatabase db, int oldVersion, int newVersion) {
}
}
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="photo"
android:onClick="openAlbum"/>
<ImageView
android:id="@+id/imgView"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="save"
android:onClick="saveToDatabase"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="show"
android:id="@+id/btn_show"
android:onClick="imgShow"/>
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/imgShow"/>
</LinearLayout>