Android中简单实现选择图片并裁剪

在android中选择图片是一个很常见的功能，图片的来源通常情况下是从相机获取和从相册获取两种。 先来写一个简单的选择按钮和一个能显示图片的ImageView

==”vertical” ><Button=”wrap_content”android:text=”获取图片” /><ImageView=>

接下来就是实现的逻辑

TAKE_PHOTO = 1;CROP_PHOTO = 2;private Button getPicture;private ImageView picture;private Uri imageUri;

设置按钮的点击事件

(View v) {takePhotoitems = new String[] { “选择本地图片”, “拍照” };imageUri = getImageUri();new AlertDialog.Builder(this).setTitle(“设置头像”).setItems(takePhotoitems,new DialogInterface.OnClickListener() {(DialogInterface dialog,int which) {switch (which) {case 0:getImageUri();Intent intent = new Intent(Intent.ACTION_GET_CONTENT);intent.setDataAndType(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,”image/*”);intent.setType(“image/*”);intent.putExtra(“crop”, “true”);intent.putExtra(“scale”, true);intent.putExtra(MediaStore.EXTRA_OUTPUT,imageUri);startActivityForResult(intent, CROP_PHOTO);break;case 1:// 拍照getImageUri();if (isHasSdcard()) {Intent takePhotoIntent = new Intent(“android.media.action.IMAGE_CAPTURE”);takePhotoIntent.putExtra(MediaStore.EXTRA_OUTPUT,imageUri);startActivityForResult(takePhotoIntent,TAKE_PHOTO);} else {Toast.makeText(MainActivity.this,”未检测到sd卡”, Toast.LENGTH_LONG).show();}break;}}}).setNegativeButton(“取消”, new DialogInterface.OnClickListener() {(DialogInterface dialog, int which) {dialog.dismiss();}}).show();}

用到的两个工具方法

/*** 获取图片的路径*/private Uri getImageUri() {File outputImage = new File(Environment.getExternalStorageDirectory(),”tempImage.jpg”);if (outputImage.exists()) {outputImage.delete();}try {outputImage.createNewFile();} catch (IOException e) {e.printStackTrace();}return Uri.fromFile(outputImage);}; /*** 判断sd卡是否存在*/() {String state = Environment.getExternalStorageState();if (state.equals(Environment.MEDIA_MOUNTED)) {return true;} else {return false;}}

获取到图片后进行裁剪

(int requestCode, int resultCode, Intent data) {switch (requestCode) {case TAKE_PHOTO:if (resultCode == RESULT_OK) {Intent intent = new Intent(“com.android.camera.action.CROP”);intent.setDataAndType(imageUri, “image/*”);intent.putExtra(“scale”, true);intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);startActivityForResult(intent, CROP_PHOTO);}break;case CROP_PHOTO:if (resultCode == RESULT_OK) {try {Bitmap bitmap = BitmapFactory.decodeStream(getContentResolver().openInputStream(imageUri));picture.setImageBitmap(bitmap);} catch (FileNotFoundException e) {e.printStackTrace();}}break;default:break;}}

，击败不等于击倒，跌倒了，爬起来，想一想，为什么跌倒了，