Question

我查看了类似的问题并尝试编写这个简单的代码。此代码采用视图的位图图像，然后允许用户将其附加到电子邮件。出于某种原因，我收到了消息＆＃34;无法附加空文件＆＃34;在电子邮件应用程序中我对此非常陌生，我读了几个例子并尝试了不同的东西但没有工作。我怀疑我的道路可能有问题。

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"   android:layout_width="match_parent"
android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity">

<ScrollView
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:id="@+id/scrollView"
    android:layout_centerVertical="true"
    android:layout_centerHorizontal="true" >

    <LinearLayout
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/linearLayout">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/editText"
            android:text="Q1" />

        <RadioGroup
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_marginBottom="10dp">

            <RadioButton
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="New RadioButton"
                android:id="@+id/radioButton" />

            <RadioButton
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="New RadioButton"
                android:id="@+id/radioButton2" />
        </RadioGroup>

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/editText2"
            android:text="Q2" />

        <RadioGroup
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_marginBottom="10dp">

            <RadioButton
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="New RadioButton"
                android:id="@+id/radioButton3" />

            <RadioButton
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="New RadioButton"
                android:id="@+id/radioButton4" />
        </RadioGroup>

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/editText3"
            android:text="Q3" />

        <RadioGroup
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_marginBottom="10dp">

            <RadioButton
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="New RadioButton"
                android:id="@+id/radioButton5" />

            <RadioButton
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="New RadioButton"
                android:id="@+id/radioButton6" />
        </RadioGroup>

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/editText4"
            android:text="Q3" />


        <RadioGroup
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_marginBottom="10dp">

            <RadioButton
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="New RadioButton"
                android:id="@+id/radioButton7" />

            <RadioButton
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="New RadioButton"
                android:id="@+id/radioButton8" />
        </RadioGroup>

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/editText5"
            android:text="Q4" />

        <RadioGroup
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_marginBottom="10dp">

            <RadioButton
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="New RadioButton"
                android:id="@+id/radioButton10" />

            <RadioButton
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="New RadioButton"
                android:id="@+id/radioButton9" />
        </RadioGroup>

        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Email"
            android:id="@+id/button"
            android:layout_alignTop="@id/radioButton9"
            android:onClick="email" />

    </LinearLayout>



</ScrollView>

</RelativeLayout>

 package com.example.asamater.myapplication;

 import android.app.Activity;
 import android.content.Intent;
 import android.graphics.Bitmap;
 import android.graphics.Canvas;
 import android.graphics.Color;
 import android.graphics.drawable.Drawable;
import android.net.Uri;
import android.os.Environment;
import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.HorizontalScrollView;
import android.widget.ScrollView;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.util.BitSet;
import java.util.Random;

public class MainActivity extends AppCompatActivity {

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

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.menu_main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        return true;
    }

    return super.onOptionsItemSelected(item);
}


public void email(View view){
    ScrollView z = (ScrollView) findViewById(R.id.scrollView);
    int totalHeight = z.getChildAt(0).getHeight();
    int totalWidth = z.getChildAt(0).getWidth();
    Bitmap bitmap = getBitmapFromView(z,totalHeight,totalWidth);
    String path = saveImageToStorage(bitmap);

    Intent emailIntent = new Intent(android.content.Intent.ACTION_SEND);
    emailIntent.putExtra(android.content.Intent.EXTRA_EMAIL, "ammar5001@gmail.com");
    emailIntent.putExtra(android.content.Intent.EXTRA_SUBJECT, "report");
    emailIntent.putExtra(android.content.Intent.EXTRA_TEXT, " ");

    emailIntent.setType("image/jpeg");
    File bitmapFile = new File(Environment.getExternalStorageDirectory()+
            "/"+ path);
    Uri myUri = Uri.fromFile(bitmapFile);
    emailIntent.putExtra(Intent.EXTRA_STREAM, myUri);


    startActivity(Intent.createChooser(emailIntent, "Send your email in:"));

}


private String saveImageToStorage(Bitmap bitmap) {
    String root = Environment.getExternalStorageDirectory().toString();
    File myDir = new File(root + "/req_images");
    myDir.mkdirs();
    String fname = "Image-Report.jpg";
    File file = new File(myDir, fname);
    Log.i("myActivity", "" + file);
    if (file.exists())
        file.delete();
    try {
        FileOutputStream out = new FileOutputStream(file);
        bitmap.compress(Bitmap.CompressFormat.JPEG, 90, out);
        out.flush();
        out.close();
        return root + "/req_images" + fname;
    } catch (Exception e) {
        e.printStackTrace();
        return null;
    }
}


public Bitmap getBitmapFromView(View view, int totalHeight, int totalWidth) {
    Bitmap returnedBitmap = Bitmap.createBitmap(totalWidth,totalHeight , Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(returnedBitmap);
    Drawable bgDrawable = view.getBackground();
    if (bgDrawable != null)
        bgDrawable.draw(canvas);
    else
        canvas.drawColor(Color.WHITE);
    view.draw(canvas);
    return returnedBitmap;
}

{{1}}

}

Answer 1

清单需求：

 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.asamater.myapplication" >
    <!-- Permissions need to be added too-->
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> 
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
         android:label="@string/app_name"
         android:theme="@style/AppTheme" >
        <activity
        android:name=".MainActivity"
        android:label="@string/app_name" >
         <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
         </intent-filter>
     </activity>
</application>

用此替换您的电子邮件方法，然后删除saveImageToStorage方法：

public void email(View view){
    ScrollView z = (ScrollView) findViewById(R.id.scrollView);
    int totalHeight = z.getChildAt(0).getHeight();
    int totalWidth = z.getChildAt(0).getWidth();
    Bitmap bitmap = getBitmapFromView(z,totalHeight,totalWidth);

    // Create the file directory
    File myDir = new File(Environment.getExternalStorageDirectory() + "/req_images");
    myDir.mkdirs();
    // For multiple files you want to create a timestamp so the name is unique
    DateFormat format = new SimpleDateFormat("yyyy_MM_dd_H_mm_ss", Locale.getDefault());
        Date curDate = new Date();
        String displayDate = format.format(curDate);
    String fname = displayDate+ "_Image-Report.jpg"; // now this is dynamic

     // create the file in the directory
     File file = new File(myDir, fname);

    Intent emailIntent = new Intent(android.content.Intent.ACTION_SEND);
    emailIntent.putExtra(android.content.Intent.EXTRA_EMAIL, "ammar5001@gmail.com");
    emailIntent.putExtra(android.content.Intent.EXTRA_SUBJECT, "report");
    emailIntent.putExtra(android.content.Intent.EXTRA_TEXT, " ");

   /*
    * The important part where you create the file and save it
    */
    emailIntent.setType("image/*"); // accept any image

     try {
            boolean fileCreated = file.createNewFile();
            if (fileCreated) {
               // write the bitmap to that file
                FileOutputStream outputStream = new FileOutputStream(file);
                bitmap.compress(Bitmap.CompressFormat.PNG, 100, outputStream);
                outputStream.close();
            }
        } catch (IOException ex) {
            Log.d("SAVE FAILED", "could not save file");
        }

     // then attach the file to the intent
     emailIntent.putExtra(Intent.EXTRA_STREAM, Uri.fromFile(file));

    startActivity(Intent.createChooser(emailIntent, "Send your email in:"));

 }

Answer 2

这项工作！

public void email(View view){
    ScrollView z = (ScrollView) findViewById(R.id.scrollView);
    int totalHeight = z.getChildAt(0).getHeight();
    int totalWidth = z.getChildAt(0).getWidth();
    Bitmap bitmap = getBitmapFromView(z,totalHeight,totalWidth);

    File file = BitmapSaver.saveImageToExternalStorage(this, bitmap);

    Intent emailIntent = new Intent(android.content.Intent.ACTION_SEND);
    emailIntent.putExtra(android.content.Intent.EXTRA_EMAIL, "ammar5001@gmail.com");
    emailIntent.putExtra(android.content.Intent.EXTRA_SUBJECT, "report");
    emailIntent.putExtra(android.content.Intent.EXTRA_TEXT, " ");
    emailIntent.setType("image/*"); // accept any image
    //attach the file to the intent
    emailIntent.putExtra(Intent.EXTRA_STREAM, Uri.fromFile(file));

    startActivity(Intent.createChooser(emailIntent, "Send your email in:"));

}

BitmapSaver类：

 /**
 * Created by ASamater on 01/09/2015.
 */
 public class BitmapSaver {


public static File saveImageToExternalStorage(Context context, Bitmap finalBitmap) {
    String root = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES).toString();
    File myDir = new File(root + "/saved_images");
    myDir.mkdirs();
    long n  = System.currentTimeMillis() / 1000L;
    String fname = "Image-" + n + ".jpg";
    File file = new File(myDir, fname);
    if (file.exists())
        file.delete();
    try {
        FileOutputStream out = new FileOutputStream(file);
        finalBitmap.compress(Bitmap.CompressFormat.JPEG, 90, out);
        out.flush();
        out.close();
    }
    catch (Exception e) {
        e.printStackTrace();
    }

    // Tell the media scanner about the new file so that it is
    // immediately available to the user.
    MediaScannerConnection.scanFile(context, new String[]{file.toString()}, null,
            new MediaScannerConnection.OnScanCompletedListener() {
                public void onScanCompleted(String path, Uri uri) {
                    Log.i("ExternalStorage", "Scanned " + path + ":");
                    Log.i("ExternalStorage", "-> uri=" + uri);
                }
            });

    return file;
}

}

在电子邮件中发送位图图像

2 个答案: