Question

我是android新手。我正在尝试做某种图像处理。但是我收到这条消息“这个应用程序---意外停止了。请再试一次。”请告诉我我犯了什么错误

package com.imagep.amit;

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

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

public class ImagepActivity extends Activity {
    /** Called when the activity is first created. */

    Bitmap myBitmap;
    ImageView myImageView;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        String imageFileName= "/sdcard/test_vga.jpg";
        File imageFile= new File(imageFileName);
        if (imageFile.exists()) {
            // Load the image from file
            myBitmap= BitmapFactory.decodeFile(imageFileName);
            // Display the image in the image viewer
            myImageView= (ImageView)findViewById(R.id.di);
            if (myImageView!= null) {
                myImageView.setImageBitmap(myBitmap);
            }
        }
        this.processImage();
    }

    private void processImage() {
        brighten(50);
        try {
            String outputPath= "/test_vga_output.jpg";
            int quality = 75;
            FileOutputStream fileOutStr= new FileOutputStream(outputPath);
            BufferedOutputStream bufOutStr= new BufferedOutputStream(fileOutStr);
            myBitmap.compress(CompressFormat.JPEG, quality, bufOutStr);
            bufOutStr.flush();
            bufOutStr.close();
        } catch (FileNotFoundException exception) {
            Log.e("debug_log", exception.toString());
        } catch (IOException exception) {
            Log.e("debug_log", exception.toString());
        }
        myImageView.setImageBitmap(myBitmap);
    }

    private void brighten(int i) {
        int width = myBitmap.getWidth();
        int height = myBitmap.getHeight();
        int[] pix = new int[width * height];
        myBitmap.getPixels(pix, 0, width, 0, 0, width, height);
        // Apply pixel-by-pixel change
        int index = 0;
        for(int y = 0; y < height; y++) {
            for (int x = 0; x < width; x++) {
                int r = (pix[index] >> 16) & 0xff;
                int g = (pix[index] >> 8) & 0xff;
                int b = pix[index] & 0xff;
                r = 0;
                g = 0;
                b = 0;
                pix[index++] = 0xff000000| (r << 16) | (g << 8) | b;
            } // x 
        } // y
        // TODO Auto-generated method stub
    }
}
}

Answer 1

在Eclipse中使用adb logcat，DDMS或DDMS透视图来检查LogCat并查看与错误相关联的堆栈跟踪。

此外，从不硬连接路径，特别是因为/sdcard错误 - 使用Environment.getExternalStorageDirectory()获取外部存储的根目录。

最后，您的实际问题可能来自：

String outputPath= "/test_vga_output.jpg";

这是一条无效路径。我不知道你在哪里写作，但你不能写在那里。但是，除此之外，您可能还有其他问题，堆栈跟踪将帮助您识别它们。

android应用程序做力关闭

1 个答案: