這篇文章主要介紹Android如何實現(xiàn)拍照及圖片裁剪，文中介紹的非常詳細，具有一定的參考價值，感興趣的小伙伴們一定要看完！
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最近做項目中涉及到了圖片相關功能 ，在使用安卓6.0手機及7.1手機拍照時，遇到了因權限及文件管理導致程序崩潰等問題。
剛好把功能修改完，把代碼簡單地貼一下，方便以后使用。
—-主界面 代碼 ——
重慶分公司
重慶分公司
public class MainActivity extends AppCompatActivity {
//拍照按鈕
private Button take_photo;
//顯示裁剪后的圖片
private ImageView photo_iv;
private static final int PERMISSIONS_FOR_TAKE_PHOTO = 10;
//圖片文件路徑
private String picPath;
//圖片對應Uri
private Uri photoUri;
//拍照對應RequestCode
public static final int SELECT_PIC_BY_TACK_PHOTO = 1;
//裁剪圖片
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以后權限處理
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 {
//錯誤提示
}
}
if (requestCode == CROP_PICTURE) {
if (photoUri != null) {
Bitmap bitmap = BitmapFactory.decodeFile(picPath);
if (bitmap != null) {
photo_iv.setImageBitmap(bitmap);
}
}
}
}
}
/**
* 拍照獲取圖片
*/
private void takePictures() {
//執(zhí)行拍照前，應該先判斷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, "手機未插入內存卡", Toast.LENGTH_LONG).show();
}
}
/**
* 圖片裁剪，參數(shù)根據(jù)自己需要設置
*
* @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/*");
// 下面這個crop=true是設置在開啟的Intent中設置顯示的VIEW可裁剪
intent.putExtra("crop", "true");
intent.putExtra("scale", true);// 去黑邊
intent.putExtra("scaleUpIfNeeded", true);// 去黑邊
// aspectX aspectY 是寬高的比例
intent.putExtra("aspectX", 4);//輸出是X方向的比例
intent.putExtra("aspectY", 3);
intent.putExtra("outputX", 600);//輸出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);//設置為不返回數(shù)據(jù)
startActivityForResult(intent, REQUE_CODE_CROP);
}
/**
* 7.0以上版本圖片裁剪操作
*
* @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");
//輸出是X方向的比例
intent.putExtra("aspectX", 4);
intent.putExtra("aspectY", 3);
// outputX outputY 是裁剪圖片寬高
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以上版本權限處理
*/
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——–
