如何在安卓系统中将拍摄的图片分享给另一个应用

原文:https://www . geeksforgeeks . org/如何将捕获的图像共享给另一个安卓应用/

先决条件: 如何通过意图打开相机并拍摄图像

在本文中，我们将尝试使用安卓工作室将捕获的图像()从本文发送到其他应用程序。

进场:

  1. 捕获的图像存储在外部存储器中。因此我们需要向用户请求访问文件的权限。因此，在清单文件中获取访问外部存储的权限。

  2. 这里 pictureDir(文件)指的是名为 DIRECTORY_PICTURES

    ```java File pictureDir = new File( Environment.getExternalStoragePublicDirectory( Environment.DIRECTORY_PICTURES), "CameraDemo");

    ```

    的外存目录 3. 在 onCreate()方法中，检查目录图片目录是否存在。如果没有，那么用下面的代码创建目录

    ```java if(!pictureDir.exists()){ pictureDir.mkdirs(); }

    ```

  3. 创建另一个名为callcamerapp()的方法，从外部存储器获取被点击的图像。

    • 使用“意图”捕捉图像
    • 创建一个文件，将图像存储在 pictureDir 目录中。
    • 获取此图像文件的 URI 对象
    • 将图像放在意图存储上，以便从应用程序的其他模块访问。
    • 将图像传递给 startActivityForResult()

  4. 使用 intent 将此图片分享给其他应用程序。

    ```java Intent emailIntent = new Intent(android.content.Intent.ACTION_SEND);

    ```

  5. 为了这篇文章，我们将选择 Gmail，并将此图片作为邮件附件发送。

    ```java startActivity(Intent.createChooser(emailIntent, "Send mail..."));

    ```

以下是上述方法的完整实现:

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <!--Textview with title "Camera_Demo!" is given by  -->     
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Camera Demo!"
        android:id="@+id/tv"
        android:textSize="20sp"
        android:textStyle="bold"
        android:layout_centerHorizontal="true"
        />

    <!-- Add button to take a picture--> 
    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/tv"
        android:layout_marginTop="50dp"
        android:text="Take Picture"
        android:textSize="20sp"
        android:textStyle="bold" />

    <!-- Add ImageView to display the captured image--> 
    <ImageView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/imageView1"
        android:layout_below="@id/button1"
        />
</RelativeLayout>

MainActivity.java

package com.example.camera_mail;

import android.Manifest;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.os.Environment;
import android.provider.MediaStore;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;

import java.io.File;

public class MainActivity
    extends AppCompatActivity
    implements View.OnClickListener {

    private static final int
        CAMERA_PIC_REQUEST
        = 1337;
    private static final int
        REQUEST_EXTERNAL_STORAGE_RESULT
        = 1;
    private static final String
        FILE_NAME
        = "image01.jpg";

    private Button b1;
    private ImageView img1;

    File pictureDir
        = new File(
            Environment.getExternalStoragePublicDirectory(
                Environment.DIRECTORY_PICTURES),
            "CameraDemo");
    private Uri fileUri;

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

        b1 = (Button)findViewById(R.id.button1);
        img1 = (ImageView)findViewById(R.id.imageView1);
        b1.setOnClickListener(this);
        if (!pictureDir.exists()) {
            pictureDir.mkdirs();
        }
    }

    // Open the camera app to capture the image
    public void callCameraApp()
    {
        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        File image = new File(pictureDir, FILE_NAME);
        fileUri = Uri.fromFile(image);
        intent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri);
        startActivityForResult(intent, CAMERA_PIC_REQUEST);
    }

    public void onClick(View arg0)
    {
        if (
            ContextCompat.checkSelfPermission(
                this,
                Manifest
                    .permission
                    .WRITE_EXTERNAL_STORAGE)
            == PackageManager.PERMISSION_GRANTED) {

            callCameraApp();
        }
        else {
            if (
                ActivityCompat
                    .shouldShowRequestPermissionRationale(
                        this,
                        Manifest
                            .permission
                            .WRITE_EXTERNAL_STORAGE)) {
                Toast.makeText(
                         this,
                         "External storage permission"
                             + " required to save images",
                         Toast.LENGTH_SHORT)
                    .show();
            }

            ActivityCompat
                .requestPermissions(
                    this,
                    new String[] {
                        Manifest
                            .permission
                            .WRITE_EXTERNAL_STORAGE },
                    REQUEST_EXTERNAL_STORAGE_RESULT);
        }
    }

    protected void onActivityResult(int requestCode,
                                    int resultCode,
                                    Intent data)
    {

        if (requestCode == CAMERA_PIC_REQUEST
            && resultCode == RESULT_OK) {
            ImageView imageView
                = (android.widget.ImageView)
                    findViewById(R.id.imageView1);

            File image = new File(pictureDir, FILE_NAME);
            fileUri = Uri.fromFile(image);
            imageView.setImageURI(fileUri);
            emailPicture();
        }
        else if (resultCode == RESULT_CANCELED) {
            Toast.makeText(
                     this,
                     "You did not click the photo",
                     Toast.LENGTH_SHORT)
                .show();
        }
    }

    @Override
    public void onRequestPermissionsResult(
        int requestCode,
        String[] permissions,
        int[] grantResults)
    {

        if (requestCode == REQUEST_EXTERNAL_STORAGE_RESULT) {
            if (grantResults[0]
                == PackageManager.PERMISSION_GRANTED) {
                callCameraApp();
            }
            else {
                Toast.makeText(
                         this, "External write permission"
                                   + " has not been granted, "
                                   + " cannot saved images",
                         Toast.LENGTH_SHORT)
                    .show();
            }
        }
        else {
            super.onRequestPermissionsResult(
                requestCode,
                permissions,
                grantResults);
        }
    }

    // Function to send the image through mail
    public void emailPicture()
    {
        Toast.makeText(
                 this,
                 "Now, sending the mail",
                 Toast.LENGTH_LONG)
            .show();

        Intent emailIntent
            = new Intent(
                android.content.Intent.ACTION_SEND);
        emailIntent.setType("application/image");

        emailIntent.putExtra(
            android.content.Intent.EXTRA_EMAIL,
            new String[] {

                // default receiver id
                "enquiry@geeksforgeeks.org" });

        // Subject of the mail
        emailIntent.putExtra(
            android.content.Intent.EXTRA_SUBJECT,
            "New photo");

        // Body of the mail
        emailIntent.putExtra(
            android.content.Intent.EXTRA_TEXT,
            "Here's a captured image");

        // Set the location of the image file
        // to be added as an attachment
        emailIntent.putExtra(Intent.EXTRA_STREAM, fileUri);

        // Start the email activity
        // to with the prefilled information
        startActivity(
            Intent.createChooser(emailIntent,
                                 "Send mail..."));
    }
}

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest
    xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.camera_mail">

    <uses-permission
        android:name="android.permission.WRITE_EXTERNAL_STORAGE"
    />

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

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

</manifest>

  1. 启动 app UI of App

    启动应用程序

  2. Capture the image image clicked and giving two options to user

    Capture the image and provide the user with two options

  3. 选择要共享拍摄图像的应用。这里 GMail 选择的是

  4. 通过邮件

    发送拍摄的图像通过邮件发送捕获的图像

  5. Image received

    Image received by mail

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