最近做项目中涉及到了图片相关功能 ，在使用安卓6.0手机及7.1手机拍照时，遇到了因权限及文件管理导致程序崩溃等问题。
刚好把功能修改完，把代码简单地贴一下，方便以后使用。
—-主界面 代码 ——
public class MainActivity extends AppCompatActivity { //拍照按钮 private Button take_photo; //显示裁剪后的图片 private ImageView photo_iv; private static final int PERMISSIONS_FOR_TAKE_PHOTO = 10; //图片文件路径 private String picPath; //图片对应Uri private Uri photoUri; //拍照对应RequestCode public static final int SELECT_PIC_BY_TACK_PHOTO = 1; //裁剪图片 private static final int CROP_PICTURE = 3; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); take_photo = (Button) findViewById(R.id.take_photo); photo_iv = (ImageView) findViewById(R.id.photo_iv); take_photo.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { //小于6.0版本直接操作 if (Build.VERSION.SDK_INT < 23) { takePictures(); } else { //6.0以后权限处理 permissionForM(); } } }); } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); if (resultCode == Activity.RESULT_OK) { if (requestCode == SELECT_PIC_BY_TACK_PHOTO) { String[] pojo = {MediaStore.Images.Media.DATA}; Cursor cursor = managedQuery(photoUri, pojo, null, null, null); if (cursor != null) { int columnIndex = cursor.getColumnIndexOrThrow(pojo[0]); cursor.moveToFirst(); picPath = cursor.getString(columnIndex); if (Build.VERSION.SDK_INT < 14) { cursor.close(); } } if (picPath != null && (picPath.endsWith(".png") || picPath.endsWith(".PNG") || picPath.endsWith(".jpg") || picPath.endsWith(".JPG"))) { photoUri = Uri.fromFile(new File(picPath)); if (Build.VERSION.SDK_INT > 23) { photoUri = FileProvider.getUriForFile(this, "com.innopro.bamboo.fileprovider", new File(picPath)); cropForN(picPath, CROP_PICTURE); } else { startPhotoZoom(photoUri, CROP_PICTURE); } } else { //错误提示 } } if (requestCode == CROP_PICTURE) { if (photoUri != null) { Bitmap bitmap = BitmapFactory.decodeFile(picPath); if (bitmap != null) { photo_iv.setImageBitmap(bitmap); } } } } } /** * 拍照获取图片 */ private void takePictures() { //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); ContentValues values = new ContentValues(); photoUri = getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values); intent.putExtra(MediaStore.EXTRA_OUTPUT, photoUri); startActivityForResult(intent, SELECT_PIC_BY_TACK_PHOTO); } else { Toast.makeText(this, "手机未插入内存卡", Toast.LENGTH_LONG).show(); } } /** * 图片裁剪，参数根据自己需要设置 * * @param uri * @param REQUE_CODE_CROP */ private void startPhotoZoom(Uri uri, int REQUE_CODE_CROP) { int dp = 500; Intent intent = new Intent("com.android.camera.action.CROP"); intent.setDataAndType(uri, "image/*"); // 下面这个crop=true是设置在开启的Intent中设置显示的VIEW可裁剪 intent.putExtra("crop", "true"); intent.putExtra("scale", true);// 去黑边 intent.putExtra("scaleUpIfNeeded", true);// 去黑边 // aspectX aspectY 是宽高的比例 intent.putExtra("aspectX", 4);//输出是X方向的比例 intent.putExtra("aspectY", 3); intent.putExtra("outputX", 600);//输出X方向的像素 intent.putExtra("outputY", 450); intent.putExtra("outputFormat", Bitmap.CompressFormat.JPEG.toString()); intent.putExtra("noFaceDetection", true); intent.putExtra(MediaStore.EXTRA_OUTPUT, uri); intent.putExtra("return-data", false);//设置为不返回数据 startActivityForResult(intent, REQUE_CODE_CROP); } /** * 7.0以上版本图片裁剪操作 * * @param imagePath * @param REQUE_CODE_CROP */ private void cropForN(String imagePath, int REQUE_CODE_CROP) { Uri cropUri = getImageContentUri(new File(imagePath)); Intent intent = new Intent("com.android.camera.action.CROP"); intent.setDataAndType(cropUri, "image/*"); intent.putExtra("crop", "true"); //输出是X方向的比例 intent.putExtra("aspectX", 4); intent.putExtra("aspectY", 3); // outputX outputY 是裁剪图片宽高 intent.putExtra("outputX", 600); intent.putExtra("outputY", 450); intent.putExtra("scale", true); intent.putExtra("return-data", false); intent.putExtra(MediaStore.EXTRA_OUTPUT, cropUri); intent.putExtra("outputFormat", Bitmap.CompressFormat.JPEG.toString()); intent.putExtra("noFaceDetection", true); startActivityForResult(intent, REQUE_CODE_CROP); } private 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; } } } /** * 安卓6.0以上版本权限处理 */ private void permissionForM() { if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED || ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED || ContextCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) { ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.CAMERA, Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.READ_EXTERNAL_STORAGE}, PERMISSIONS_FOR_TAKE_PHOTO); } else { takePictures(); } } @Override public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) { if (requestCode == PERMISSIONS_FOR_TAKE_PHOTO) { if (grantResults[0] == PackageManager.PERMISSION_GRANTED) { takePictures(); } return; } super.onRequestPermissionsResult(requestCode, permissions, grantResults); } }
–主界面布局——–
<?xml version="1.0" encoding="utf-8"?> <android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context="com.innopro.improve.MainActivity"> <Button android:id="@+id/take_photo" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="拍照" android:textSize="18sp" app:layout_constraintLeft_toLeftOf="parent" app:layout_constraintRight_toRightOf="parent" app:layout_constraintTop_toTopOf="parent" /> <ImageView android:id="@+id/photo_iv" android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@mipmap/ic_launcher" app:layout_constraintLeft_toLeftOf="parent" app:layout_constraintRight_toRightOf="parent" app:layout_constraintTop_toBottomOf="@id/take_photo" /> </android.support.constraint.ConstraintLayout>
–AndroidManifest.xml添加provider——–
<provider android:name="android.support.v4.content.FileProvider" android:authorities="com.innopro.improve.fileprovider" android:exported="false" android:grantUriPermissions="true"> <meta-data android:name="android.support.FILE_PROVIDER_PATHS" android:resource="@xml/file_paths" /> </provider>
–资源文件下添加xml文件夹及file_paths文件——–
<?xml version="1.0" encoding="utf-8"?> <resources> <paths> <external-path name="camera_photos" path="" /> </paths> </resources>
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。