第一行代码笔记 获取拍照照片和相册选取照片
16lz
2022-07-26
示例:
public class GetPicActivity extends AppCompatActivity implements View.OnClickListener { private ImageView showImg; private Uri imageUri; public static final int TAKE_PHOTO = 1; public static final int CHOOSE_PHOTO = 2; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_get_pic); initView(); } private void initView() { findViewById(R.id.getPicFromCamera).setOnClickListener(this); findViewById(R.id.getPicFromAblum).setOnClickListener(this); showImg = ((ImageView) findViewById(R.id.showImg)); } @Override public void onClick(View v) { switch (v.getId()) { case R.id.getPicFromCamera: getPicFromCamra(); break; case R.id.getPicFromAblum: getPicFromAblum(); break; } } private void getPicFromCamra() {// 创建file对象,用于存储拍照后的图片,通过getExternalCacheDir放在应用关联缓存目录// 具体路径是/sdcard/Android/data//cache,android6.0读写sd卡为 // 危险权限,需要运行时权限,而放应用关联缓存不要 File outPutImage = new File(getExternalCacheDir(), "output_img.jpg"); try { if (outPutImage.exists()) { outPutImage.delete(); } outPutImage.createNewFile(); } catch (IOException e) { e.printStackTrace(); } if (Build.VERSION.SDK_INT >= 24) {// android7.0直接使用本地真实路径uri是不安全的,通过FileProvider是一种特殊的内容提供器// 可以选择性的将封装过的uri提供给外部,提高安全性。参数1:context对象。参数二:可以是任意的字符串,// 参数三:刚刚创建的file对象。注意这里用到了内容提供者 imageUri = FileProvider.getUriForFile(GetPicActivity.this, "com.lvyequeen.test.day04.getpic", outPutImage); } else {// 获取的是这张图片的真是路径 imageUri = Uri.fromFile(outPutImage); }// 用意图打开相机 Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");// 指定图片输出地址 intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);// 隐示意图启动 startActivityForResult(intent, TAKE_PHOTO); } /** * 通过相册获取图片 */ private void getPicFromAblum() {// 判断授予sd卡读写权限 if (ContextCompat.checkSelfPermission(GetPicActivity.this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) { ActivityCompat.requestPermissions(GetPicActivity.this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1); } else { openAblum(); } } /** * 打开相册 */ private void openAblum() { Intent intent = new Intent("android.intent.action.GET_CONTENT"); intent.setType("image/*"); startActivityForResult(intent, CHOOSE_PHOTO); } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { if (resultCode == RESULT_OK) { switch (requestCode) { case TAKE_PHOTO: try { Bitmap bitmap = BitmapFactory.decodeStream(getContentResolver().openInputStream(imageUri)); showImg.setImageBitmap(bitmap); } catch (FileNotFoundException e) { e.printStackTrace(); } break; case CHOOSE_PHOTO: if (Build.VERSION.SDK_INT >= 19) {// 4.4及以上系统,选取相册中的图片不再返回图片真实的uri handleImageOnKitKat(data); } else { handleImagebeforeKitKat(data); } break; } } } @TargetApi(Build.VERSION_CODES.KITKAT) private void handleImageOnKitKat(Intent data) { String imagePath = null; Uri uri = data.getData();// 如果uri是document类型,就通过读取document id进行处理 if (DocumentsContract.isDocumentUri(this, uri)) { String docId = DocumentsContract.getDocumentId(uri);// 如果Uri的Authority是media格式的话,document id还需要进行解析,然后通过字符串// 分割方式取出后半部分才能得到真正的数字id if ("com.android.providers.media.documents".equals(uri.getAuthority())) { String id = docId.split(":")[1]; String selection = MediaStore.Images.Media._ID + "=" + id; imagePath = getImagePath(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, selection); } else if ("com.android.providers.downloads,documents".equals(uri.getAuthority())) { Uri contentUri = ContentUris.withAppendedId(Uri.parse("content://downloads.public_downloads"), Long.valueOf(docId)); imagePath = getImagePath(contentUri, null); } } else if ("content".equalsIgnoreCase(uri.getScheme())) {// 如果是content类型的uri,则使用普通方式处理 imagePath = getImagePath(uri, null); } else if ("file".equalsIgnoreCase(uri.getScheme())) {// 如果是file类型,直接获取图片路径 imagePath = uri.getPath(); } displayImage(imagePath); } private void handleImagebeforeKitKat(Intent data) { Uri uri = data.getData(); String imagePath = getImagePath(uri, null); displayImage(imagePath); } /** * 获取图片真实路径 * * @param uri * @param selection * @return */ private String getImagePath(Uri uri, String selection) { String path = null; Cursor cursor = getContentResolver().query(uri, null, selection, null, null); if (null != cursor) { if (cursor.moveToFirst()) { path = cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DATA)); } cursor.close(); } return path; } /** * 根据图片路径显示图片 * * @param imagePath */ private void displayImage(String imagePath) { if (null != imagePath) { Bitmap b = BitmapFactory.decodeFile(imagePath); showImg.setImageBitmap(b); } else { Toast.makeText(this, "获取图片失败", Toast.LENGTH_LONG).show(); } } /** * 处理权限的 * * @param requestCode * @param permissions * @param grantResults */ @Override public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) { switch (requestCode) { case 1: if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) { openAblum(); } else { Toast.makeText(this, "没有权限啦~~", Toast.LENGTH_SHORT).show(); } break; } }}
注意事项:拍照上传的时候用到了内容提供者要去清单文件中注册,写在application里面的
android:authorities="com.lvyequeen.test.day04.getpic" android:name="android.support.v4.content.FileProvider" android:exported="false" android:grantUriPermissions="true"> android:name="android.support.FILE_PROVIDER_PATHS" android:resource="@xml/file_paths" />
在res文件夹下面创建一个xml文件夹,再在此文件夹下创建的file_path.xml
<?xml version="1.0" encoding="utf-8"?>xmlns:android="http://schemas.android.com/apk/res/android"> name="my_images" path="" />
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