Android拍照或者选取本地图片
kevinjqy 人气:0总体流程
从selectPhotoActivity中启动图册或者相机,再根据获取的uri进行裁剪,返回uri,再对这个uri执行一系列操纵。
从相册选取图片
private void pickPhoto() { Intent intent = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI); startActivityForResult(intent, SELECT_PIC_BY_PICK_PHOTO); }
使用隐式intent启动相机。
拍照获取图片
private void takePhoto() { // 执行拍照前,应该先判断SD卡是否存在 String SDState = Environment.getExternalStorageState(); if (SDState.equals(Environment.MEDIA_MOUNTED)) { Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);// "android.media.action.IMAGE_CAPTURE" File path = Environment .getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM); File file = new File(path, IMAGE_FILE_NAME); takePhoto = Uri.fromFile(file); intent.putExtra(android.provider.MediaStore.EXTRA_OUTPUT, takePhoto); startActivityForResult(intent, SELECT_PIC_BY_TACK_PHOTO); } else { Toast.makeText(getApplicationContext(), "内存卡不存在", Toast.LENGTH_SHORT).show(); } }
值得注意的一点是,intent.putExtra(android.provider.MediaStore.EXTRA_OUTPUT, takePhoto)中,设置了拍完照照片的存放路径takePhoto,在此情况下,部分机型的onActivityResult()中不会返回数据,即data.getData()为空,因为可以根据存放路径即可获取拍照图片。
裁剪图片
public void startPhotoZoom(Uri uri) { Intent intent = new Intent("com.android.camera.action.CROP"); intent.setDataAndType(uri, "image/*"); // 设置裁剪 intent.putExtra("crop", "true"); // aspectX aspectY 是宽高的比例 intent.putExtra("aspectX", 1); intent.putExtra("aspectY", 1); // outputX outputY 是裁剪图片宽高 intent.putExtra("outputX", 340); intent.putExtra("outputY", 340); //将URI指向相应的file:///… intent.putExtra(MediaStore.EXTRA_OUTPUT, uri); // 不返回图片文件 intent.putExtra("return-data", false); startActivityForResult(intent, RESULT_REQUEST_CODE); }
裁剪方法调用android自带的裁剪库,部分深度定制的机型,如魅族,可能不存在该库,那么就需要自定义或者使用开源裁剪库。
返回的数据的处理
protected void onActivityResult(int requestCode, int resultCode, Intent data) { if (resultCode != Activity.RESULT_OK) { Log.e("TAG","ActivityResult resultCode error"); return; } switch (requestCode){ case SELECT_PIC_BY_PICK_PHOTO: Uri uri = data.getData(); if (!TextUtils.isEmpty(uri.getAuthority())) { //查询选择图片 Cursor cursor = getContentResolver().query( uri, new String[] { MediaStore.Images.Media.DATA }, null, null, null); //返回 没找到选择图片 if (null == cursor) { return; } //光标移动至开头 获取图片路径 cursor.moveToFirst(); picPath = cursor.getString(cursor .getColumnIndex(MediaStore.Images.Media.DATA)); Log.d("图片路径啊啊啊啊啊啊",picPath); } break; case SELECT_PIC_BY_TACK_PHOTO: //裁剪图片 startPhotoZoom(takePhoto); break; case RESULT_REQUEST_CODE : if (data != null) { Log.d("图片路径",data.getData().toString()); picPath = getPathByUri4kitkat(getApplicationContext(),data.getData()); Log.d("图片路径啊啊啊啊啊啊",picPath); } break; } if(requestCode != SELECT_PIC_BY_TACK_PHOTO) { lastIntent.putExtra(KEY_PHOTO_PATH, picPath); setResult(Activity.RESULT_OK, lastIntent); finish(); } super.onActivityResult(requestCode, resultCode, data); }
因为在本activity中可能启动三个新的activity,即拍照activity,相册activity,裁剪activity。需要注意,拍完照的图片需要经过裁剪,即,只有从相册选取和裁剪返回的数据可以setRuselt(),故需要添加一个if语句加以判别。
根据Uri获取真实路径
还是因为机型适配的问题,以下提供两种方法,大家自己尝试:
方法一
public static String getRealPathFromURI(final Context context, final Uri uri ) { if ( null == uri ) return null; final String scheme = uri.getScheme(); String data = null; if ( scheme == null ) data = uri.getPath(); else if ( ContentResolver.SCHEME_FILE.equals( scheme ) ) { data = uri.getPath(); } else if ( ContentResolver.SCHEME_CONTENT.equals( scheme ) ) { Cursor cursor = context.getContentResolver().query( uri, new String[] { MediaStore.Images.ImageColumns.DATA }, null, null, null ); if ( null != cursor ) { if ( cursor.moveToFirst() ) { int index = cursor.getColumnIndex( MediaStore.Images.ImageColumns.DATA ); if ( index > -1 ) { data = cursor.getString( index ); } } cursor.close(); } } return data; }
方法二
@SuppressLint("NewApi") public static String getPathByUri4kitkat(final Context context, final Uri uri) { final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT; // DocumentProvider if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) { if (isExternalStorageDocument(uri)) {// ExternalStorageProvider final String docId = DocumentsContract.getDocumentId(uri); final String[] split = docId.split(":"); final String type = split[0]; if ("primary".equalsIgnoreCase(type)) { return Environment.getExternalStorageDirectory() + "/" + split[1]; } } else if (isDownloadsDocument(uri)) {// DownloadsProvider final String id = DocumentsContract.getDocumentId(uri); final Uri contentUri = ContentUris.withAppendedId(Uri.parse("content://downloads/public_downloads"), Long.valueOf(id)); return getDataColumn(context, contentUri, null, null); } else if (isMediaDocument(uri)) {// MediaProvider final String docId = DocumentsContract.getDocumentId(uri); final String[] split = docId.split(":"); final String type = split[0]; Uri contentUri = null; if ("image".equals(type)) { contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI; } else if ("video".equals(type)) { contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI; } else if ("audio".equals(type)) { contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI; } final String selection = "_id=?"; final String[] selectionArgs = new String[] { split[1] }; return getDataColumn(context, contentUri, selection, selectionArgs); } } else if ("content".equalsIgnoreCase(uri.getScheme())) {// MediaStore // (and // general) return getDataColumn(context, uri, null, null); } else if ("file".equalsIgnoreCase(uri.getScheme())) {// File return uri.getPath(); } return null; } /** * Get the value of the data column for this Uri. This is useful for * MediaStore Uris, and other file-based ContentProviders. * * @param context * The context. * @param uri * The Uri to query. * @param selection * (Optional) Filter used in the query. * @param selectionArgs * (Optional) Selection arguments used in the query. * @return The value of the _data column, which is typically a file path. */ public static String getDataColumn(Context context, Uri uri, String selection, String[] selectionArgs) { Cursor cursor = null; final String column = "_data"; final String[] projection = { column }; try { cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs, null); if (cursor != null && cursor.moveToFirst()) { final int column_index = cursor.getColumnIndexOrThrow(column); return cursor.getString(column_index); } } finally { if (cursor != null) cursor.close(); } return null; } /** * @param uri * The Uri to check. * @return Whether the Uri authority is ExternalStorageProvider. */ public static boolean isExternalStorageDocument(Uri uri) { return "com.android.externalstorage.documents".equals(uri.getAuthority()); } /** * @param uri * The Uri to check. * @return Whether the Uri authority is DownloadsProvider. */ public static boolean isDownloadsDocument(Uri uri) { return "com.android.providers.downloads.documents".equals(uri.getAuthority()); } /** * @param uri * The Uri to check. * @return Whether the Uri authority is MediaProvider. */ public static boolean isMediaDocument(Uri uri) { return "com.android.providers.media.documents".equals(uri.getAuthority()); }
整体代码
public class selectPhotoActivity extends Activity implements View.OnClickListener{ /** 使用照相机拍照获取图片 */ public static final int SELECT_PIC_BY_TACK_PHOTO = 1; /** 使用相册中的图片 */ public static final int SELECT_PIC_BY_PICK_PHOTO = 2; /** 裁剪图片 */ private static final int RESULT_REQUEST_CODE = 3; /** 开启相机 */ private Button btn_take_photo; /** 开启图册 */ private Button btn_pick_photo; /** 取消 */ private Button btn_cancel; /** 图片名称 */ private static final String IMAGE_FILE_NAME = "image.jpg"; /** 获取到的图片路径 */ private String picPath; //保存裁剪后的图像 private Bitmap photo; private Intent lastIntent; private Uri takePhoto; /** 从Intent获取图片路径的KEY */ public static final String KEY_PHOTO_PATH = "photo_path"; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_select_photo); btn_take_photo = (Button) findViewById(R.id.btn_take_photo); btn_pick_photo = (Button) findViewById(R.id.btn_pick_photo); btn_cancel = (Button) findViewById(R.id.btn_cancel); lastIntent = getIntent(); btn_take_photo.setOnClickListener(this); btn_pick_photo.setOnClickListener(this); btn_cancel.setOnClickListener(this); } @Override public void onClick(View v) { switch (v.getId()) { case R.id.btn_take_photo : // 开启相机 takePhoto(); break; case R.id.btn_pick_photo : // 开启图册 pickPhoto(); break; case R.id.btn_cancel : // 取消操作 this.finish(); break; default : break; } } /** * 拍照获取图片 */ private void takePhoto() { // 执行拍照前,应该先判断SD卡是否存在 String SDState = Environment.getExternalStorageState(); if (SDState.equals(Environment.MEDIA_MOUNTED)) { Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);// "android.media.action.IMAGE_CAPTURE" File path = Environment .getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM); File file = new File(path, IMAGE_FILE_NAME); takePhoto = Uri.fromFile(file); intent.putExtra(android.provider.MediaStore.EXTRA_OUTPUT, takePhoto); startActivityForResult(intent, SELECT_PIC_BY_TACK_PHOTO); } else { Toast.makeText(getApplicationContext(), "内存卡不存在", Toast.LENGTH_SHORT).show(); } } /*** * 从相册中取图片 */ private void pickPhoto() { Intent intent = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI); startActivityForResult(intent, SELECT_PIC_BY_PICK_PHOTO); } @Override public boolean onTouchEvent(MotionEvent event) { finish(); return super.onTouchEvent(event); } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { if (resultCode != Activity.RESULT_OK) { Log.e("TAG","ActivityResult resultCode error"); return; } switch (requestCode){ case SELECT_PIC_BY_PICK_PHOTO: Uri uri = data.getData(); if (!TextUtils.isEmpty(uri.getAuthority())) { //查询选择图片 Cursor cursor = getContentResolver().query( uri, new String[] { MediaStore.Images.Media.DATA }, null, null, null); //返回 没找到选择图片 if (null == cursor) { return; } //光标移动至开头 获取图片路径 cursor.moveToFirst(); picPath = cursor.getString(cursor .getColumnIndex(MediaStore.Images.Media.DATA)); Log.d("图片路径啊啊啊啊啊啊",picPath); } break; case SELECT_PIC_BY_TACK_PHOTO: //裁剪图片 startPhotoZoom(takePhoto); break; case RESULT_REQUEST_CODE : if (data != null) { Log.d("图片路径",data.getData().toString()); picPath = getPathByUri4kitkat(getApplicationContext(),data.getData()); Log.d("图片路径啊啊啊啊啊啊",picPath); } break; } if(requestCode != SELECT_PIC_BY_TACK_PHOTO) { lastIntent.putExtra(KEY_PHOTO_PATH, picPath); setResult(Activity.RESULT_OK, lastIntent); finish(); } super.onActivityResult(requestCode, resultCode, data); } /** * 裁剪图片方法实现 * * @param uri */ public void startPhotoZoom(Uri uri) { Intent intent = new Intent("com.android.camera.action.CROP"); intent.setDataAndType(uri, "image/*"); // 设置裁剪 intent.putExtra("crop", "true"); // aspectX aspectY 是宽高的比例 intent.putExtra("aspectX", 1); intent.putExtra("aspectY", 1); // outputX outputY 是裁剪图片宽高 intent.putExtra("outputX", 340); intent.putExtra("outputY", 340); //将URI指向相应的file:///… intent.putExtra(MediaStore.EXTRA_OUTPUT, uri); // 不返回图片文件 intent.putExtra("return-data", false); startActivityForResult(intent, RESULT_REQUEST_CODE); } //Android 4.4后通过Uri获取路径以及文件名一种方法 public static String getRealPathFromURI(final Context context, final Uri uri ) { if ( null == uri ) return null; final String scheme = uri.getScheme(); String data = null; if ( scheme == null ) data = uri.getPath(); else if ( ContentResolver.SCHEME_FILE.equals( scheme ) ) { data = uri.getPath(); } else if ( ContentResolver.SCHEME_CONTENT.equals( scheme ) ) { Cursor cursor = context.getContentResolver().query( uri, new String[] { MediaStore.Images.ImageColumns.DATA }, null, null, null ); if ( null != cursor ) { if ( cursor.moveToFirst() ) { int index = cursor.getColumnIndex( MediaStore.Images.ImageColumns.DATA ); if ( index > -1 ) { data = cursor.getString( index ); } } cursor.close(); } } return data; } // 专为Android4.4设计的从Uri获取文件绝对路径,以前的方法已不好使 @SuppressLint("NewApi") public static String getPathByUri4kitkat(final Context context, final Uri uri) { final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT; // DocumentProvider if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) { if (isExternalStorageDocument(uri)) {// ExternalStorageProvider final String docId = DocumentsContract.getDocumentId(uri); final String[] split = docId.split(":"); final String type = split[0]; if ("primary".equalsIgnoreCase(type)) { return Environment.getExternalStorageDirectory() + "/" + split[1]; } } else if (isDownloadsDocument(uri)) {// DownloadsProvider final String id = DocumentsContract.getDocumentId(uri); final Uri contentUri = ContentUris.withAppendedId(Uri.parse("content://downloads/public_downloads"), Long.valueOf(id)); return getDataColumn(context, contentUri, null, null); } else if (isMediaDocument(uri)) {// MediaProvider final String docId = DocumentsContract.getDocumentId(uri); final String[] split = docId.split(":"); final String type = split[0]; Uri contentUri = null; if ("image".equals(type)) { contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI; } else if ("video".equals(type)) { contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI; } else if ("audio".equals(type)) { contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI; } final String selection = "_id=?"; final String[] selectionArgs = new String[] { split[1] }; return getDataColumn(context, contentUri, selection, selectionArgs); } } else if ("content".equalsIgnoreCase(uri.getScheme())) {// MediaStore // (and // general) return getDataColumn(context, uri, null, null); } else if ("file".equalsIgnoreCase(uri.getScheme())) {// File return uri.getPath(); } return null; } /** * Get the value of the data column for this Uri. This is useful for * MediaStore Uris, and other file-based ContentProviders. * * @param context * The context. * @param uri * The Uri to query. * @param selection * (Optional) Filter used in the query. * @param selectionArgs * (Optional) Selection arguments used in the query. * @return The value of the _data column, which is typically a file path. */ public static String getDataColumn(Context context, Uri uri, String selection, String[] selectionArgs) { Cursor cursor = null; final String column = "_data"; final String[] projection = { column }; try { cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs, null); if (cursor != null && cursor.moveToFirst()) { final int column_index = cursor.getColumnIndexOrThrow(column); return cursor.getString(column_index); } } finally { if (cursor != null) cursor.close(); } return null; } /** * @param uri * The Uri to check. * @return Whether the Uri authority is ExternalStorageProvider. */ public static boolean isExternalStorageDocument(Uri uri) { return "com.android.externalstorage.documents".equals(uri.getAuthority()); } /** * @param uri * The Uri to check. * @return Whether the Uri authority is DownloadsProvider. */ public static boolean isDownloadsDocument(Uri uri) { return "com.android.providers.downloads.documents".equals(uri.getAuthority()); } /** * @param uri * The Uri to check. * @return Whether the Uri authority is MediaProvider. */ public static boolean isMediaDocument(Uri uri) { return "com.android.providers.media.documents".equals(uri.getAuthority()); } }
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