Android 调用相机、相册功能

  清单文件中增加对应权限，动态申请权限（此部分请参考Android 动态申请权限，在此不作为重点描述）

private static final int REQUEST_CODE_ALBUM = 100;//打开相册
private static final int REQUEST_CODE_CAMERA = 101;//打开相机

//调用相册
private void openAlbum(){
    Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
    intent.setType("image/*");
    startActivityForResult(intent, REQUEST_CODE_ALBUM);
}

//调用相机
private void openCamera1(){
    Intent intent;
    intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    startActivityForResult(intent, REQUEST_CODE_CAMERA);
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if(requestCode == REQUEST_CODE_ALBUM && resultCode == RESULT_OK){
        if (data != null) {
            // 照片的原始资源地址
            Uri uri = data.getData();
            String path = uri.getPath();
            ContentResolver cr = context.getContentResolver();
            try {
                Bitmap bitmap = BitmapFactory.decodeStream(cr.openInputStream(uri));
                /* 将Bitmap设定到ImageView */
                imageView.setImageBitmap(bitmap);
            } catch (FileNotFoundException e) {
                Log.e("Exception", e.getMessage(), e);
            }

        }
    }else if(requestCode == REQUEST_CODE_CAMERA && resultCode == RESULT_OK){
        if(data != null && data.getData() != null){
            Bundle extras = data.getExtras();
            if (extras != null) {
                Bitmap bitmap = extras.getParcelable("data");
                /* 将Bitmap设定到ImageView */
                imageView.setImageBitmap(bitmap);
　　　　　　　　　 //可将图片保存下来，用于上传或其他操作（如果不需要可以省略此步）
　　　　　　　　　 String path = savePicToSdcard(image,Environment.getExternalStorageDirectory().getPath(),System.currentTimeMillis() + ".jpg");

            }
        }
    }
}

public static String savePicToSdcard(Bitmap bitmap, String path, String fileName) {
    String filePath = "";
    if (bitmap != null) {
        filePath = path + File.separator + fileName;
        File destFile = new File(filePath);
        OutputStream os = null;
        try {
            os = new FileOutputStream(destFile);
            bitmap.compress(Bitmap.CompressFormat.JPEG, 100, os);
            os.flush();
            os.close();
        } catch (IOException e) {
            filePath = "";
        }
    }
    return filePath;
}

上述相机方法相片清晰度低，获取的是返回对象中的略缩图；如对照片清晰度有要求，可以在上面方法的基础上进行修改，方法如下：

需要在清单文件中application中增加如下代码：

<provider
    android:name="android.support.v4.content.FileProvider"
    android:authorities="${applicationId}.fileprovider"
    android:exported="false"
    android:grantUriPermissions="true">
    <meta-data
        android:name="android.support.FILE_PROVIDER_PATHS"
        android:resource="@xml/file_paths" />
</provider>

创建file_paths.xml文件

项目目录res下创建xml文件夹，xml文件夹下创建file_paths.xml文件，文件内容：

<?xml version="1.0" encoding="utf-8"?>
<paths>
    <external-path
        name="external_storage_root"
        path="." />
</paths>

配置完成后，修改增加如下代码：

private static final int REQUEST_RESULT_CODE = 102;//裁剪后保存

//调用相机（指定相机拍摄照片保存地址，相片清晰度高）
private void openCamera2(){
    String photoPath = Environment.getExternalStorageDirectory().getPath()+"/"+File.separator+"123.jpg";
    File pictureFile = new File(photoPath);
    Uri picUri;
    Intent intent;
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
        intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        String packageName = context.getApplicationContext().getPackageName();
        picUri = FileProvider.getUriForFile(context, new StringBuilder(packageName).append(".fileprovider").toString(), pictureFile);
    } else {
        intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
        picUri = Uri.fromFile(pictureFile);
    }
    intent.putExtra(MediaStore.EXTRA_OUTPUT, picUri);
    startActivityForResult(intent, REQUEST_CODE_CAMERA);
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if(requestCode == REQUEST_CODE_ALBUM && resultCode == RESULT_OK){
        if (data != null) {
            // 照片的原始资源地址
            Uri uri = data.getData();
            String path = uri.getPath();
            ContentResolver cr = context.getContentResolver();
            try {
                Bitmap bitmap = BitmapFactory.decodeStream(cr.openInputStream(uri));
                /* 将Bitmap设定到ImageView */
                imageView.setImageBitmap(bitmap);
            } catch (FileNotFoundException e) {
                Log.e("Exception", e.getMessage(), e);
            }
        }
    }else if(requestCode == REQUEST_CODE_CAMERA && resultCode == RESULT_OK){
        File tempFile = new File(photoPath);
        cropImg(getImageContentUri(tempFile));//对照片进行裁剪保存
    }else if(requestCode ==REQUEST_RESULT_CODE && resultCode == RESULT_OK){
        try {
            Bitmap image = BitmapFactory.decodeStream(getContentResolver().openInputStream(mUriPath));
            /* 将Bitmap设定到ImageView */
            imageView.setImageBitmap(bitmap);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
    }
}

public Uri getImageContentUri(File imageFile) {

    String filePath = imageFile.getAbsolutePath();
    Cursor cursor = getContentResolver().query(
            MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
            new String[]{MediaStore.Images.Media._ID},
            MediaStore.Images.Media.DATA + "=? ",
            new String[]{filePath}, null);

    if (cursor != null && cursor.moveToFirst()) {
        int id = cursor.getInt(cursor
                .getColumnIndex(MediaStore.MediaColumns._ID));
        Uri baseUri = Uri.parse("content://media/external/images/media");
        return Uri.withAppendedPath(baseUri, "" + id);
    } else {
        if (imageFile.exists()) {
            ContentValues values = new ContentValues();
            values.put(MediaStore.Images.Media.DATA, filePath);
            return getContentResolver().insert(
                    MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);
        } else {
            return null;
        }
    }
}

public void cropImg(Uri uri){

    Intent intent = new Intent("com.android.camera.action.CROP");
    intent.setDataAndType(uri, "image/*");

    //实现对图片的裁剪，必须要设置图片的属性和大小
    intent.putExtra("crop", "true");  //滑动选中图片区域
    intent.putExtra("aspectX", 1);  //裁剪框比例1:1
    intent.putExtra("aspectY", 1);
    intent.putExtra("outputX", 700);  //输出图片大小
    intent.putExtra("outputY", 700);
    intent.putExtra("return-data", true);  //有返回值

    String mLinshi = System.currentTimeMillis() + ".jpg";
    photoFile = new File(Environment.getExternalStorageDirectory().getPath(), mLinshi);

    mUriPath = Uri.parse("file://" + photoFile.getAbsolutePath());
    //将裁剪好的图输出到所建文件中
    intent.putExtra(MediaStore.EXTRA_OUTPUT, mUriPath);
    intent.putExtra("outputFormat", Bitmap.CompressFormat.JPEG.toString());
    //注意：此处应设置return-data为false，如果设置为true，是直接返回bitmap格式的数据，耗费内存。设置为false，然后，设置裁剪完之后保存的路径，即：intent.putExtra(MediaStore.EXTRA_OUTPUT, uriPath);
    intent.putExtra("return-data", false);
    startActivityForResult(intent, REQUEST_RESULT_CODE);
}