java - Android 帮助将图像保存到 Sd 卡并将广播发送到 MediaScanner

Question

我在将图像从 r.drawable.image1 保存到手机 SD 卡的图片文件夹中，然后向 MediaScanner 发送广播以刷新文件夹以使图像出现在手机图库中时遇到一些问题.

我相信解决方案与此有关

sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED, Uri.parse("file://"+ Environment.getExternalStorageDirectory())));

现在的问题是图像没有保存到 SD，我不知道将上面的媒体扫描仪代码放在哪里，因为在我过去 3 天摆弄它之后，下面的代码现在什么也没做。请帮忙...

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import android.net.Uri;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.widget.Button;
import android.widget.Toast;
import android.media.MediaScannerConnection;
import android.os.Bundle;
import android.os.Environment;

public class MainScreen extends Activity 
{ 
    private Button btnDownload;
    /** Called when the activity is first created. */
    @Override     
    public void onCreate(Bundle savedInstanceState) 
    {         
        super.onCreate(savedInstanceState);         
        setContentView(R.layout.main);     
        btnDownload=(Button)findViewById(R.id.SaveButton1);

        btnDownload.setOnClickListener(
            new Button.OnClickListener() {
                @Override
                public void onClick(View v) {
                    String newPicture = saveToSDCard(R.drawable.image1, "image1.jpg");
                    startMediaScanner(newPicture);
                }
            }
        );
    }

    private String saveToSDCard(int resourceID, String finalName)
    {
        StringBuffer createdFile = new StringBuffer();

        Bitmap resourceImage = BitmapFactory.decodeResource(this.getResources(), resourceID);       
        File externalStorageFile = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES), finalName);
        ByteArrayOutputStream bytes = new ByteArrayOutputStream(); 
        resourceImage.compress(Bitmap.CompressFormat.JPEG, 100, bytes);
        byte b[] = bytes.toByteArray(); 

        try 
        {
            externalStorageFile.createNewFile(); 
            OutputStream filoutputStream = new FileOutputStream(externalStorageFile); 
            filoutputStream.write(b); 
            filoutputStream.flush(); 
            filoutputStream.close();
            createdFile.append(externalStorageFile.getAbsolutePath());
        }
        catch (IOException e)
        {
        }

        return createdFile.toString();
    }

    private void startMediaScanner(String fileName)
    {
        MediaScannerConnection.scanFile(this,
            new String[] { fileName }, null,
            new MediaScannerConnection.OnScanCompletedListener() {
            public void onScanCompleted(String path, Uri uri)
            {
                Toast.makeText(MainScreen.this, "Media scan Completed", Toast.LENGTH_SHORT).show(); 
            }
        });
    }
}

Answer 1

请使用MediaScannerConnection“刷新文件夹，以便图像出现在手机上的图库中”。