拍照保存本地更新相册的2种方法 ,兼容4，5，6，7操作系统；
从相册获取照片以及路径；
动态申请权限；
bit64和bitmap相互转化
1.创建File的应用关系缓存目录，getExternalCacheDir() 通过他读取。
不存在sd卡的其他路径下，当6.0以上时需要动态申请拍照权限。此做法可以刚好避免申请权限，存放路径是/sdcard/Android/data/<package name>/cache
private Uri uriForFile;
private ImageView imag;
private void initPhoto() {
TextView takePhoto = findViewById(R.id.photo);
imag = findViewById(R.id.image);
takePhoto.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
long time = System.currentTimeMillis();
SimpleDateFormat format = new SimpleDateFormat("MM-dd HH:mm:ss");
Date d1 = new Date(time);
String title = format.format(d1);
File outputImage = new File(getExternalCacheDir(), title + ".png");//存放照片的照片，将他才能在手机SDk上的应用关联缓存目录
try {
if (outputImage.exists()) {
outputImage.delete();
}
outputImage.createNewFile();
if (Build.VERSION.SDK_INT >= 24) {
uriForFile = FileProvider.getUriForFile(menuActivity.this, "com.example.stf.uri_one.fileprovider", outputImage); //此标红出7.0以后需要，特殊的文件共享
} else {
uriForFile = Uri.fromFile(outputImage);
}
Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");//隐士启动相机
intent.putExtra(MediaStore.EXTRA_OUTPUT, uriForFile);
startActivityForResult(intent, 1);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
2.将照片显示出来并更新到相册
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
switch (requestCode) {
case 1:
if (resultCode == RESULT_OK) {
try {
//两种方式，一种直接去本地读取，生成bitmap显示出来，另一种是借助glide加载
// Bitmap bitmap = BitmapFactory.decodeStream(getContentResolver().openInputStream(uriForFile));
// imag.setImageBitmap(bitmap);
// Log.i("stf", "--bitmap-2>" + getBitmap(bitmap) / 1024 + "-uriForFile->" + uriForFile);
Glide
.with(menuActivity.this)
.load(uriForFile)
.into(imag);
intoAlbum(uriForFile);
} catch (Exception e) {
e.printStackTrace();
}
}
break;
default:
break;
}
}
补充：查看bitmap的在内存中的大小
public long getBitmap(Bitmap bitmap) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) { //API 19
return bitmap.getAllocationByteCount();
}
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR1) {//API 12
return bitmap.getByteCount();
}
// 在低版本中用一行的字节x高度
return bitmap.getRowBytes() * bitmap.getHeight();
}
// 更新到相册
private void intoXiangCe(Uri uriForFile) {
File file = new File(uriForFile.getPath());
Context mContext = menuActivity.this;
try {
MediaStore.Images.Media.insertImage(mContext.getContentResolver(), file.getAbsolutePath(),
file.getName(), null);//图片插入到系统图库
} catch (Exception e) {
e.printStackTrace();
}
mContext.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.parse("file://" +
file.getAbsolutePath())));
}
3 .7.0拍照特殊配置
在清单文件中声明：
provider
<provider
android:authorities="com.example.stf.uri_one.fileprovider"
android:exported="false"
android:grantUriPermissions="true"
android:name="android.support.v4.content.FileProvider">
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/file_paths"/>
</provider>
说明：name属性是固定值；android:authorities 属性值必须和刚才拍照时的一直;
另外需要添加 file_paths.xml文件。如下
QQ截图20180419160828.jpg
1)在res文件夹下建立xml文件夹
2)在xml文件夹建立file_paths.xml文件
3)编辑file_paths.xm文件
<?xml version = "1.0" encoding ="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
<external-path
name="imgs"
path="" />
<!--external-path 是制定Uri共享的，name属性是可以随便填写，path属性的值表示共享的具体路径，空表示将整个sdk进行共享,当然也可以只共享单独的路径-->
</paths>
为了兼容6.0以下更低的版本，固定的权限还是要加上
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
4.从相册里面获取照片和其路径
1)先动态获取权限
private void initxiangce() {
View viewById = findViewById(R.id.photos2);
viewById.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (ContextCompat.checkSelfPermission(menuActivity.this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(menuActivity.this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1);
} else {
openAlbm();
}
}
});
}
2)弹出申请权限的对话框并进行判断是否已经给权限了
@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) {
openAlbm();
} else {
Toast.makeText(menuActivity.this, "暂无权限", Toast.LENGTH_SHORT).show();
}
break;
default:
break;
}
}
3)进入相册
private void openAlbm() {
Intent intent = new Intent("android.intent.action.GET_CONTENT");
intent.setType("image/*");
startActivityForResult(intent, 2);
}
4)选取照片后获取到path
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
switch (requestCode) {
case 2:
if (resultCode == RESULT_OK) {
// 判断手机系统的版本号
if (Build.VERSION.SDK_INT >= 19) {
// 4.4系统以上使用这个方法处理照片
handleImageOnKitKat(data);
} else {
//4.4 一下系统使用这个方法处理照片
handleImageBeforeKitKat(data);
}
}
break;
default:
break;
}
}
4.4以上
@TargetApi(Build.VERSION_CODES.KITKAT)
private void handleImageOnKitKat(Intent data) {
String imagePath = null;
Uri uri = data.getData();
Log.i("stf", "uri--->" + uri);
if (DocumentsContract.isDocumentUri(this, uri)) {
//documents 类型的uri ，则通过documment的id处理
String docId = DocumentsContract.getDocumentId(uri);
if ("com.android.providers.media.documents".equals(uri.getAuthority())) {
String id = docId.split(":")[1];//解析出数字格式的id
String selection = MediaStore.Images.Media._ID + "=" + id;
imagePath = getImagePath(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, selection);
} else if ("com.android.providers.downsloads.documents".equals(uri.getAuthority())) {
Uri contentUri = ContentUris.withAppendedId(Uri.parse("content://downsloads/public_downloads"), Long.valueOf(docId));
imagePath = getImagePath(contentUri, null);
}
} else if ("content".equalsIgnoreCase(uri.getScheme())) {
//如果content类型uri ，使用普通方式处理
imagePath = getImagePath(uri, null);
} else if ("file".equalsIgnoreCase(uri.getScheme())) {
//如果是file类型的uri，直接获取图片的路径即可
imagePath = uri.getPath();
}
displayImage(imagePath);
}
4.4以下
private void handleImageBeforeKitKat(Intent data) {
displayImage(getImagePath(data.getData(), null));
}
辅助方法
根据uri取路径path
private String getImagePath(Uri uri, String selection) {
String path = null;
//通过uri和selection 来获取真实图片的路劲
Cursor cursor = getContentResolver().query(uri, null, selection, null, null);
if (cursor != null) {
if (cursor.moveToFirst()) {
path = cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DATA));
}
cursor.close();
}
return path;
}
根据路径设置bitmap
private void displayImage(String imagePath) {
if (imagePath != null) {
Bitmap bitmap = BitmapFactory.decodeFile(imagePath);
imag3.setImageBitmap(bitmap);
} else {
Toast.makeText(menuActivity.this, "照片路径不存在", Toast.LENGTH_SHORT).show();
}
}
压缩照片
public boolean compressImage(String path) {
int height = 800;
boolean res = false;
Bitmap bmp = BitmapFactory.decodeFile(path);
if (bmp != null) {
int w = bmp.getWidth();
int h = bmp.getHeight();
if (height >= h) {
bmp.recycle();
} else {
Bitmap resize = Bitmap.createScaledBitmap(bmp, w * height / h, height, false);
bmp.recycle();
try {
FileOutputStream out = new FileOutputStream(path);
if (resize.compress(Bitmap.CompressFormat.JPEG, 75, out)) {
out.flush();
out.close();
res = true;
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
return res;
}
对照片进行Base64加密
public String getImageString(String path) {
String res = null;
try {
File file = new File(path);
FileInputStream fis = new FileInputStream(file);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int count = 0;
while ((count = fis.read(buffer)) >= 0) {
baos.write(buffer, 0, count);
}
// res = new String(org.kobjects.base64.Base64.encode(baos.toByteArray()));
res = new String(Base64.encode(baos.toByteArray(), Base64.DEFAULT)); //进行Base64编码
baos.close();
fis.close();
} catch (Exception e) {
e.printStackTrace();
}
return res;
}
64位的流，转换为照片bitmap
initSetImageWater(file);
private void initSetImageWater(String str) {
byte[] decode = Base64.decode(str, Base64.DEFAULT);
Glide.with(mContext)
.load(decode)
.into(mImgWater);
decode = null;
}
清单文件中添加权限
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />
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