Android 調用相機、相冊功能

 

  清單文件中增加對應權限，動態申請權限（此部分請參考Android 動態申請權限，在此不作為重點描述）

private static final int REQUEST_CODE_ALBUM = 100;//打開相冊
private static final int REQUEST_CODE_CAMERA = 101;//打開相機

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

//調用相機
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) {
            // 照片的原始資源地址
            Uri uri = data.getData();
            String path = uri.getPath();
            ContentResolver cr = context.getContentResolver();
            try {
                Bitmap bitmap = BitmapFactory.decodeStream(cr.openInputStream(uri));
                /* 將Bitmap設定到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");
 /* 將Bitmap設定到ImageView */
 imageView.setImageBitmap(bitmap);
　　　　　　　　　 //可將圖片保存下來，用於上傳或其他操作（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;
}

上述相機方法相片清晰度低，獲取的是返回對象中的略縮圖；如對照片清晰度有要求，可以在上面方法的基礎上進行修改，方法如下：

需要在清單文件中application中增加如下代碼：

<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>

創建file_paths.xml文件

項目目錄res下創建xml文件夾，xml文件夾下創建file_paths.xml文件，文件內容：

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

配置完成后，修改增加如下代碼：

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

//調用相機（指定相機拍攝照片保存地址，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) {
 // 照片的原始資源地址
 Uri uri = data.getData();
 String path = uri.getPath();
 ContentResolver cr = context.getContentResolver();
 try {
 Bitmap bitmap = BitmapFactory.decodeStream(cr.openInputStream(uri));
 /* 將Bitmap設定到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));//對照片進行裁剪保存
 }else if(requestCode ==REQUEST_RESULT_CODE && resultCode == RESULT_OK){
 try {
 Bitmap image = BitmapFactory.decodeStream(getContentResolver().openInputStream(mUriPath));
 /* 將Bitmap設定到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/*");

    //實現對圖片的裁剪，必須要設置圖片的屬性和大小
    intent.putExtra("crop", "true");  //滑動選中圖片區域
    intent.putExtra("aspectX", 1);  //裁剪框比例1:1
    intent.putExtra("aspectY", 1);
    intent.putExtra("outputX", 700);  //輸出圖片大小
    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());
    //將裁剪好的圖輸出到所建文件中
    intent.putExtra(MediaStore.EXTRA_OUTPUT, mUriPath);
    intent.putExtra("outputFormat", Bitmap.CompressFormat.JPEG.toString());
    //注意：此處應設置return-data為false，如果設置為true，是直接返回bitmap格式的數據，耗費內存。設置為false，然后，設置裁剪完之后保存的路徑，即：intent.putExtra(MediaStore.EXTRA_OUTPUT, uriPath);
    intent.putExtra("return-data", false);
    startActivityForResult(intent, REQUEST_RESULT_CODE);
}