android相簿拍照儲存圖片到本地
阿新 • • 發佈：2019-01-27
功能：選擇相簿或者拍照圖片儲存到本地，下次開啟程式直接顯示，圖片可裁剪。
一。新建佈局：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation 二：Activity中展示
onCreate中顯示本地圖片
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn = (Button) findViewById(R.id.btn1);
btn2 = (Button) findViewById(R.id.btn2);
img = (ImageView) findViewById(R.id.img);
btn.setOnClickListener(this);
btn2.setOnClickListener(this);
//讀取儲存的點陣圖（圖片）
Bitmap bitmap1 = readImg();
if (bitmap1 != null) {
img.setImageBitmap(bitmap1);
} else {
return;
}
}讀取路徑下圖片
Constant.SDPATH路徑為下面路徑
public static final String SDPATH = Environment.getExternalStorageDirectory() + “/northAmerica/”
//讀取點陣圖（圖片）
private Bitmap readImg() {
File mfile = new File(Constant.SDPATH + "/abc" + ".JPEG");
Bitmap bm = null;
if (mfile.exists()) { //若該檔案存在
bm = BitmapFactory.decodeFile(Constant.SDPATH + "/abc" + ".JPEG");
}
return bm;
}開啟相簿與拍照方法
@Override
public void onClick(View v) {
Intent intent;
switch (v.getId()) {
case R.id.btn1:
//開啟手機的相簿;
if (Build.VERSION.SDK_INT >= 23) {
int checkPermission = ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.READ_EXTERNAL_STORAGE);
if (checkPermission != PackageManager.PERMISSION_GRANTED) {
(new AlertDialog.Builder(MainActivity.this)).setMessage("您需要在設定裡開啟儲存空間許可權。").setPositiveButton("確認", new android.content.DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.READ_EXTERNAL_STORAGE}, 100);
}
}).setNegativeButton("取消", (android.content.DialogInterface.OnClickListener) null).create().show();
return;
}
}
intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(intent, 0x1);
break;
case R.id.btn2:
if (Build.VERSION.SDK_INT >= 23) {
int checkPermission = ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.READ_EXTERNAL_STORAGE);
if (checkPermission != PackageManager.PERMISSION_GRANTED) {
(new AlertDialog.Builder(MainActivity.this)).setMessage("您需要在設定裡開啟儲存空間許可權。").setPositiveButton("確認", new android.content.DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.READ_EXTERNAL_STORAGE}, 100);
}
}).setNegativeButton("取消", (android.content.DialogInterface.OnClickListener) null).create().show();
return;
}
}
intent = new Intent();
//MediaStore.ACTION_IMAGE_CAPTURE 呼叫系統的照相機
intent.setAction(MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(intent, 0x3);
break;
}
}在onActivityResult方法接收
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == 0x1) {
if (data != null) {
Uri uri = data.getData();
//裁剪圖片
getImg(uri);
} else {
return;
}
}
if (requestCode == 0x2) {
if (data != null) {
Bundle bundle = data.getExtras();
//得到圖片
Bitmap bitmap = bundle.getParcelable("data");
// //儲存到圖片到本地
FileUtils.saveBitmap(bitmap, "abc");
//設定圖片
img.setImageBitmap(bitmap);
} else {
return;
}
}
if (requestCode == 0x3) {
if (data != null) {
Bundle bundle = data.getExtras();
Bitmap bitmap = bundle.getParcelable("data");
FileUtils.saveBitmap(bitmap, "abc");
img.setImageBitmap(bitmap);
} else {
return;
}
}
}呼叫裁剪圖片
private void getImg(Uri uri) {
try {
InputStream inputStream = getContentResolver().openInputStream(uri);
//從輸入流中解碼點陣圖
// Bitmap bitmap = BitmapFactory.decodeStream(inputStream);
//儲存點陣圖
// img.setImageBitmap(bitmap);
cutImg(uri);
//關閉流
inputStream.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
//裁剪圖片
private void cutImg(Uri uri) {
if (uri != null) {
Intent intent = new Intent("com.android.camera.action.CROP");
intent.setDataAndType(uri, "image/*");
//true:出現裁剪的框
intent.putExtra("crop", "true");
//裁剪寬高時的比例
intent.putExtra("aspectX", 1);
intent.putExtra("aspectY", 1);
//裁剪後的圖片的大小
intent.putExtra("outputX", 300);
intent.putExtra("outputY", 300);
intent.putExtra("return-data", true); // 返回資料
intent.putExtra("output", uri);
intent.putExtra("scale", true);
startActivityForResult(intent, 0x2);
} else {
return;
}
}儲存圖片到本地方法
public static void saveBitmap(Bitmap bm, String picName) {
Log.e("", "儲存圖片");
try {
if (!isFileExist("")) {
File tempf = createSDDir("");
}
File f = new File(Constant.SDPATH, picName + ".JPEG");
if (f.exists()) {
f.delete();
}
FileOutputStream out = new FileOutputStream(f);
bm.compress(Bitmap.CompressFormat.JPEG, 90, out);
out.flush();
out.close();
Log.e("", "已經儲存");
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}OK 搞定了。
下面展示下部裁剪圖片（相簿）
通過uri轉換成字串然後轉換成bitmap進行展示
if (requestCode == 0x1) {
if (data != null) {
Uri uri = data.getData();
//+++ 不裁剪
String path = null;
try {
path = getFilePathWithUri(data.getData(), MainActivity.this);
} catch (Exception e) {
e.printStackTrace();
}
if (!TextUtils.isEmpty(path)) {
showImg(path);
} else {
showToast("獲取圖片路徑失敗");
}
//++
//裁剪圖片
// getImg(uri);
} else {
return;
} /**
* 通過URI獲取檔案的路徑
* @param uri
* @param activity
*/
public static String getFilePathWithUri(Uri uri, Activity activity) throws Exception {
if (uri == null) {
return "";
}
String picturePath = null;
String scheme = uri.getScheme();
if (ContentResolver.SCHEME_CONTENT.equals(scheme)) {
String[] filePathColumn = {MediaStore.Images.Media.DATA};
Cursor cursor = activity.getContentResolver().query(uri,
filePathColumn, null, null, null);//從系統表中查詢指定Uri對應的照片
cursor.moveToFirst();
int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
picturePath = cursor.getString(columnIndex); //獲取照片路徑
cursor.close();
} else if (ContentResolver.SCHEME_FILE.equals(scheme)) {
picturePath = uri.getPath();
}
return picturePath;
}
/**
* 顯示圖片（相簿方式）
* @param imagePath
*/
private void showImg(String imagePath) {
BitmapFactory.Options option = new BitmapFactory.Options();
option.inSampleSize = 2;
Bitmap bitmap = BitmapFactory.decodeFile(imagePath, option);
img.setImageBitmap(bitmap);
}完成。