如何将手机摄像头拍摄的图像从一个活动移动到另一个活动的图像视图？

Question

第一个活动有一个按钮，单击该按钮可打开内置摄像头。 现在拍摄照片时，将打开一个新活动，其中将在imageView捕获图像，并在下一个活动中显示共享按钮。 我已将活动设置为在拍摄图像后打开，但是我无法传输跨活动捕获的图像。 我需要帮助或推动正确的方向。

拍摄照片的第一个活动是Takepicture.java ：

import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.view.View;
import android.widget.Button;
import android.os.Environment;
import java.io.File;
import java.util.Date;

public class TakePicture extends Activity {
Button camerabutton;
Intent intent;
int requestCode;
int resultCode;
static int REQUEST_IMAGE_CAPTURE = 1;
SharedPreferences imagepreferences;
SharedPreferences.Editor imageeditor;
private String imgPath;
Uri setImageUri;
File file;
Uri imgUri;
public String getImagePath;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.takepicture);
    camerabutton = (Button) findViewById(R.id.button6);
    imagepreferences=getSharedPreferences("image", MODE_PRIVATE);
    imageeditor=imagepreferences.edit();
    camerabutton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
            if (intent.resolveActivity(getPackageManager()) != null)
                startActivityForResult(intent, REQUEST_IMAGE_CAPTURE);
    }
    });
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {
        startActivity(new Intent(TakePicture.this, Aftertakepicture.class));
    }
}
}

第二项活动， Aftertakepicture.java ：

package com.example.kesandunwokolo.febclasstest;

import android.app.Activity;
import android.os.Bundle;
import android.widget.Button;
import android.widget.ImageView;

public class Aftertakepicture extends Activity {
Button camerabutton;
ImageView saveimage;
Button sharebutton;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.aftertakepicture);
    camerabutton=(Button)findViewById(R.id.button6);
    saveimage=(ImageView)findViewById(R.id.imageView2);
    sharebutton=(Button)findViewById(R.id.button7);
}
}

第一个活动的takepicture.xml ：

<?xml version="1.0" encoding="utf-8"?>

<Button
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="Take Picture"
    android:id="@+id/button6" />

aftertakepicture.xml ：

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:layout_gravity="center_vertical">

    <Button
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Take Picture"
        android:id="@+id/button6" />

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/imageView2"
        android:minHeight="100dp"
        android:minWidth="100dp" />

    <Button
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Share"
        android:id="@+id/button7" />
</LinearLayout>

请任何帮助将不胜感激！

Answer 1

这是我的解决方案，我在我的环境中测试过。 希望这可以帮助！

如果使用模拟器进行测试，请确保支持相机

更新完整的源代码（新项目）：

MainActivity.java：

package com.example.photocapture;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.view.Menu;
import android.view.MenuItem;

import java.io.File;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;

public class MainActivity extends Activity {

    private Uri mFileUri;
    private final Context mContext = this;

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

        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);

        mFileUri = getOutputMediaFileUri(1);

        intent.putExtra(MediaStore.EXTRA_OUTPUT, mFileUri);

        // start the image capture Intent
        startActivityForResult(intent, 100);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent imageReturnedIntent) {
        super.onActivityResult(requestCode, resultCode, imageReturnedIntent);

        if (resultCode == RESULT_OK) {
            if (mFileUri != null) {
                String mFilePath = mFileUri.toString();
                if (mFilePath != null) {
                    Intent intent = new Intent(mContext, SecondActivity.class);
                    intent.putExtra("filepath", mFilePath);
                    startActivity(intent);
                }
            }
        }               
    }

    @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);
    }

    private Uri getOutputMediaFileUri(int type) {
        return Uri.fromFile(getOutputMediaFile(type));
    }

    // Return image / video
    private static File getOutputMediaFile(int type) {

        // External sdcard location
        File mediaStorageDir = new File(Environment.getExternalStorageDirectory(), "DCIM/Camera");

        // Create the storage directory if it does not exist
        if (!mediaStorageDir.exists()) {
            if (!mediaStorageDir.mkdirs()) {
                return null;
            }
        }

        // Create a media file name
        String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss", Locale.getDefault()).format(new Date());
        File mediaFile;
        if (type == 1) { // image
            mediaFile = new File(mediaStorageDir.getPath() + File.separator + "IMG_" + timeStamp + ".jpg");
        } else if (type == 2) { // video
            mediaFile = new File(mediaStorageDir.getPath() + File.separator + "VID_" + timeStamp + ".mp4");
        } else {
            return null;
        }

        return mediaFile;
    }
}

SecondActivity.java：

package com.example.photocapture;

import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.ImageView;

import java.io.File;

public class SecondActivity extends Activity {

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

        Intent intent = getIntent();
        String filepath = intent.getStringExtra("filepath");
        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inSampleSize = 8; // down sizing image as it throws OutOfMemory Exception for larger images
        filepath = filepath.replace("file://", ""); // remove to avoid BitmapFactory.decodeFile return null
        File imgFile = new File(filepath);
        if (imgFile.exists()) {
            ImageView imageView = (ImageView) findViewById(R.id.imageView);
            Bitmap bitmap = BitmapFactory.decodeFile(imgFile.getAbsolutePath(), options);
            imageView.setImageBitmap(bitmap);
        }
    }

    @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_second, 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);
    }
}

activity_main.xml中：

<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">

    <TextView android:text="@string/hello_world" android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</RelativeLayout>

activity_second.xml：

<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="com.example.photocapture.SecondActivity">

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/imageView"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true" />

</RelativeLayout>

AndroidManifest.xml中：

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

    <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>
        <activity
            android:name=".SecondActivity"
            android:label="@string/title_activity_second" >
        </activity>
    </application>

</manifest>

新项目结束

------------------

FirstActivity：

    private final Context mContext = this;

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

       buttonCapturePicture.setOnClickListener(new View.OnClickListener() {

           @Override
           public void onClick(View v) {                   
               captureImage();
           }
        });
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent imageReturnedIntent) {
        super.onActivityResult(requestCode, resultCode, imageReturnedIntent);

        if (resultCode == RESULT_OK) {
            if (mFileUri != null) {
                mFilePath = mFileUri.toString();
                if (mFilePath != null) {                    
                    Intent intent = new Intent(mContext, SecondActivity.class);
                    intent.putExtra("filepath", mFilePath);
                    startActivity(intent);
                }
            }
        }

        // refresh phone's folder content
        sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED, Uri.parse("file://" + Environment.getExternalStorageDirectory())));
    }

    private void captureImage() {
        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);

        mFileUri = getOutputMediaFileUri(1);

        intent.putExtra(MediaStore.EXTRA_OUTPUT, mFileUri);

        // start the image capture Intent
        startActivityForResult(intent, 100);
    }


    private Uri getOutputMediaFileUri(int type) {
        return Uri.fromFile(getOutputMediaFile(type));
    }

    private static File getOutputMediaFile(int type) {
        // External sdcard location
        File mediaStorageDir = new File(Environment.getExternalStorageDirectory(), "DCIM/Camera");

        // Create the storage directory if it does not exist
        if (!mediaStorageDir.exists()) {
            if (!mediaStorageDir.mkdirs()) {
                return null;
            }
        }

        // Create a media file name
        String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss", Locale.getDefault()).format(new Date());
        File mediaFile;
        if (type == 1) {
            mediaFile = new File(mediaStorageDir.getPath() + File.separator + "IMG_" + timeStamp + ".jpg");
        } else if (type == 2) {
            mediaFile = new File(mediaStorageDir.getPath() + File.separator + "VID_" + timeStamp + ".mp4");
        } else {
            return null;
        }

        return mediaFile;
    }

SecondActivity：

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

        super.addContentView(R.layout.activity_second);

        Intent intent = getIntent();
        mFilePath = intent.getStringExtra("filepath");
        previewMedia();
        ...
    }

    private void previewMedia() {              
            BitmapFactory.Options options = new BitmapFactory.Options();            
            options.inSampleSize = 8; // down sizing image as it throws OutOfMemory Exception for larger images
            mFilePath = mFilePath.replace("file://", ""); // remove to avoid BitmapFactory.decodeFile return null
            File imgFile = new File(mFilePath);
            if (imgFile.exists()) {
                final Bitmap bitmap = BitmapFactory.decodeFile(imgFile.getAbsolutePath(), options);
                mImagePreview.setImageBitmap(bitmap);
            }
        }

Answer 2

有几种方法可以实现这一点，通过在Intent （ 不推荐 ）中发送bitmap本身，或者将图像保存到存储并在建议的intent内发送其路径。 首先将图像保存到SDCARD ，然后在intent传递它

Intent intent = new Intent(this,MyClass.class);
Bundle bundle = new Bundle();
bundle.putString("IMAGE_PATH",imageFile);
intent.putExtras(bundle);
startActivity(intent);

然后在你可以使用的其他活动中

String path = getIntent().getExtras().getString("IMAGE_PATH");
Bitmap bmp = BitmapFactory.decodeFile(path);
myImage.setImageBitmap(bmp);

Answer 3

请参阅此链接 。 您应该将图像保存在文件中并获取该图像的文件路径。 然后，您可以将图像路径传递给第二个活动。