Question

我在logcat中发现了这个错误，这是我从网站上获取的代码：

Main.java

public class Main extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    Button upload_btn = (Button) this.findViewById(R.id.upload);
    upload_btn.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            // To open up a gallery browser
              Intent intent = new Intent();
              intent.setType("image/*");
              intent.setAction(Intent.ACTION_GET_CONTENT);
              startActivityForResult(Intent.createChooser(intent, "Select Picture"),1);

        }
    });

}



@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (resultCode == RESULT_OK) {
        if (requestCode == 1) {
        // currImageURI is the global variable I’m using to hold the content:
            Uri currImageURI = data.getData();
            System.out.println("Current image Path is ----->" + getRealPathFromURI(currImageURI));
            TextView tv_path = (TextView) findViewById(R.id.path);
            tv_path.setText(getRealPathFromURI(currImageURI));
            HttpUploader uploader = new HttpUploader();
            try {
              String image_name = uploader.execute(getRealPathFromURI(currImageURI)).get();        
            } catch (InterruptedException e) {
              e.printStackTrace();
            } catch (ExecutionException e) {
              e.printStackTrace();
            }

        }
    }

}



//Convert the image URI to the direct file system path of the image file
public String getRealPathFromURI(Uri contentUri) {
    String [] proj={MediaColumns.DATA};
    android.database.Cursor cursor = managedQuery( contentUri,
    proj,     // Which columns to return
    null,     // WHERE clause; which rows to return (all rows)
    null,     // WHERE clause selection arguments (none)
    null);     // Order-by clause (ascending by name)
    int column_index = cursor.getColumnIndexOrThrow(MediaColumns.DATA);
    cursor.moveToFirst();
    return cursor.getString(column_index);
}

}

HttpUploader.java

      package com.guerrilla.ptf.view;//set the correct pacage name

import java.io.ByteArrayOutputStream;
import java.util.ArrayList;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;

import com.guerrilla.ptf.view.Base64; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.os.AsyncTask; import android.util.Log;

//Uploader class
public class HttpUploader extends AsyncTask<String, Void, String> {


    @Override
    protected String doInBackground(String... path) {
        // TODO Auto-generated method stub
         String outPut = null;

            for (String sdPath : path) {

                Bitmap bitmapOrg = BitmapFactory.decodeFile(sdPath);
                ByteArrayOutputStream bao = new ByteArrayOutputStream();

                //Resize the image
                double width = bitmapOrg.getWidth();
                double height = bitmapOrg.getHeight();
                double ratio = 400/width;
                int newheight = (int)(ratio*height);

                System.out.println("———-width" + width);
                System.out.println("———-height" + height);

                bitmapOrg = Bitmap.createScaledBitmap(bitmapOrg, 400, newheight, true);

                //Here you can define .PNG as well
                bitmapOrg.compress(Bitmap.CompressFormat.JPEG, 95, bao);
                byte[] ba = bao.toByteArray();
                String ba1 = Base64.encodeBytes(ba);

                System.out.println("uploading image now ——–" + ba1);

                ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
                nameValuePairs.add(new BasicNameValuePair("image", ba1));



                try {
                    HttpClient httpclient = new DefaultHttpClient();
                    HttpPost httppost = new HttpPost("http://10.0.2.2/api.upload.php");
                    httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));

                    HttpResponse response = httpclient.execute(httppost);
                    HttpEntity entity = response.getEntity();                

                    // print response
                    outPut = EntityUtils.toString(entity);
                    Log.i("GET RESPONSE—-", outPut);

                    //is = entity.getContent();
                    Log.e("log_tag ******", "good connection");

                    bitmapOrg.recycle();

                } catch (Exception e) {
                    Log.e("log_tag ******", "Error in http connection " + e.toString());
                }
            }
            return outPut;
    }

}

这是logcat错误：

Applicaton: com.guerrilla.ptf.view
Text: Can't open file for reading

知道如何解决这个错误吗？

Answer 1

当我尝试在相对布局中加载2个片段时，我看到了类似的错误。我将布局更改为线性，问题解决了！

Android无法在Logcat中打开文件进行阅读

1 个答案: