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我有一个列表活动中的文件名列表。当用户单击文件名时，应加载该图像。我通过意图传递文件名，该位工作正常。接收活动可以获得文件名。这个活动有一个自定义视图，这就是问题所在。自定义视图应该能够从 sdcard 流式传输在其活动中收到的正确文件名，并在视图中显示生成的位图。我可以在活动中获取文件名，但视图中的文件名为空。我怎样才能解决这个问题？

在此先感谢马特。

package com.tecmark;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.Window;
import android.view.WindowManager;

public class ShowDistortion extends Activity{



    private static final String TAG = "*********showdistortion";

     @Override 
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);

            setContentView(R.layout.showdistortion);

            String fn = getIntent().getStringExtra("filename");
            Log.e(TAG, "filename = " + fn);


            final ShowDistortedBitmap sdb = (ShowDistortedBitmap)findViewById(R.id.showdistortedbitmap);
            sdb.filename = fn;


  }

}

.

package com.tecmark;

import java.io.BufferedInputStream;
import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.os.Environment;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;

public class ShowDistortedBitmap extends View{

    private static final String TAG = "*********ShowDistortedBitmap";
    private File tempFile;
    private byte[] imageArray;
    private Bitmap finalBitmap;
    protected String filename;

    public ShowDistortedBitmap(Context context, AttributeSet attrs) {
        super(context, attrs);


        tempFile = new File(Environment.getExternalStorageDirectory().
                getAbsolutePath() + "/"+filename);
        Log.e(TAG, "filename ====== "+filename);

        imageArray = new byte[(int)tempFile.length()];

     try{

            InputStream is = new FileInputStream(tempFile);
        BufferedInputStream bis = new BufferedInputStream(is);
        DataInputStream dis = new DataInputStream(bis);


        int i = 0;

        while (dis.available() > 0 ) {
        imageArray[i] = dis.readByte();
        i++;
        }

        dis.close();

    } catch (Exception e) {

           e.printStackTrace();
        }



        finalBitmap = BitmapFactory.decodeByteArray(imageArray, 0, imageArray.length);

        if(finalBitmap == null){
            Log.e(TAG, "finalbitmap = null");
        }else{
            Log.e(TAG, "finalbitmap =  not null");
        }


    }

     @Override
        public void onDraw(Canvas canvas){
            super.onDraw(canvas);



            Log.e(TAG, "******about to draw finalBitmap ");
            canvas.drawBitmap(finalBitmap, 0, 0, null);

     }

}
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