【发布时间】：2018-06-20 11:41:49
【问题描述】：
我想用相机拍照并压缩并存储在我创建的路径中。 我现在所做的是单击图片并将原始图片存储在我的路径中，但我想在存储之前对其进行压缩，以便检索压缩图像的路径。
为了保存原始图像，我创建了自己的路径，并将其存储在变量 mCurrentPhotoPath 中。
主要是我想要它存储的路径。 请帮忙。提前致谢。
package com.howaboutthis.satyaraj.videntify;
import android.Manifest;
import android.annotation.SuppressLint;
import android.content.Intent;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.support.annotation.NonNull;
import android.support.v4.content.FileProvider;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import com.google.firebase.auth.FirebaseAuth;
import java.io.File;
import java.io.IOException;
import java.net.URI;
import java.text.SimpleDateFormat;
import java.util.Date;
public class IdentifyActivity extends AppCompatActivity implements View.OnClickListener {
private static final int PICK_IMAGE_REQUEST = 1;
private static final int REQUEST_TAKE_PHOTO = 200;
private static final int CLICK_IMAGE_REQUEST = 2;
private static final String TAG = "IdentifyActivity";
private RequestPermissionHandler mRequestPermissionHandler;
String mCurrentPhotoPath;
String userName;
String userEmail;
Uri profileURL;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_identify);
mRequestPermissionHandler = new RequestPermissionHandler();
Bundle bundle = getIntent().getExtras();
assert bundle != null;
userName = bundle.getString("username");
Button cameraButton = findViewById(R.id.camera);
Button galleryButton = findViewById(R.id.gallery);
cameraButton.setOnClickListener(this);
galleryButton.setOnClickListener(this);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_profile) {
Intent intent = new Intent(IdentifyActivity.this, ProfileActivity.class);
intent.putExtra("username", userName);
intent.putExtra("user_email", userEmail);
intent.putExtra("profile_url",profileURL);
startActivity(intent);
}
else if (id == R.id.action_about)
return true;
return super.onOptionsItemSelected(item);
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.camera:
takePicture();
break;
case R.id.gallery:
pickFromGallery();
break;
}
}
private void pickFromGallery() {
String[] PERMISSIONS = {Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.CAMERA};
mRequestPermissionHandler.requestPermission(this, PERMISSIONS, REQUEST_TAKE_PHOTO, new RequestPermissionHandler.RequestPermissionListener() {
@Override
public void onSuccess() {
Intent intent = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
intent.setType("image/*");
startActivityForResult(intent, PICK_IMAGE_REQUEST);
}
@Override
public void onFailed() {
Toast.makeText(IdentifyActivity.this, "Request permission failed", Toast.LENGTH_SHORT).show();
}
});
}
private void takePicture() {
String[] PERMISSIONS = {Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.CAMERA, Manifest.permission.READ_EXTERNAL_STORAGE};
mRequestPermissionHandler.requestPermission(this, PERMISSIONS, REQUEST_TAKE_PHOTO, new RequestPermissionHandler.RequestPermissionListener() {
@Override
public void onSuccess() {
dispatchTakePictureIntent();
}
@Override
public void onFailed() {
Toast.makeText(IdentifyActivity.this, "Request permission failed", Toast.LENGTH_SHORT).show();
}
});
}
@Override
public void onBackPressed() {
super.onBackPressed();
Intent intent = new Intent(Intent.ACTION_MAIN);
intent.addCategory(Intent.CATEGORY_HOME);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
finish();
System.exit(0);
}
@Override
protected void onDestroy() {
super.onDestroy();
finish();
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == PICK_IMAGE_REQUEST && resultCode == RESULT_OK && data != null && data.getData() != null) {
Uri uri = data.getData();
File finalFile = new File(getRealPathFromURI(uri));
Intent intent = new Intent(IdentifyActivity.this, detailedActivity.class);
intent.putExtra("PATH", finalFile.getPath());
startActivity(intent);
} else if (requestCode == CLICK_IMAGE_REQUEST && resultCode == RESULT_OK) {
galleryAddPic();
Intent intent = new Intent(IdentifyActivity.this, detailedActivity.class);
intent.putExtra("PATH", mCurrentPhotoPath);
startActivity(intent);
}
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String permissions[], @NonNull int[] grantResults) {
mRequestPermissionHandler.onRequestPermissionsResult(requestCode, permissions,
grantResults);
}
public String getRealPathFromURI(Uri uri) {
String[] filePathColumn = {MediaStore.Images.Media.DATA};
Cursor cursor = getContentResolver().query(uri, filePathColumn, null, null, null);
String picturePath = null;
if (cursor != null) {
cursor.moveToFirst();
int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
picturePath = cursor.getString(columnIndex);
cursor.close();
}
return picturePath;
}
//Creating a path for the captured image to be saved. Using this path we can retrieve the original Image.
private File createImageFile() throws IOException {
// Create an image file name
@SuppressLint("SimpleDateFormat") String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
String imageFileName = "JPEG_" + timeStamp + "_";
File storageDir = getExternalFilesDir(Environment.DIRECTORY_PICTURES);
File image = File.createTempFile(
imageFileName, /* prefix */
".jpg", /* suffix */
storageDir /* directory */
);
// Save a file: path for use with ACTION_VIEW intents
mCurrentPhotoPath = image.getAbsolutePath();
return image;
}
private void dispatchTakePictureIntent() {
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
// Ensure that there's a camera activity to handle the intent
if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
// Create the File where the photo should go
File photoFile = null;
try {
photoFile = createImageFile();
} catch (IOException ex) {
Log.e(TAG,"Error while creating the file");
// Error occurred while creating the File
}
// Continue only if the File was successfully created
if (photoFile != null) {
Uri photoURI = FileProvider.getUriForFile(this,
"com.howaboutthis.satyaraj.fileprovider",
photoFile);
takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoURI);
startActivityForResult(takePictureIntent, CLICK_IMAGE_REQUEST);
}
}
}
// Adding the pic to the gallery so that it is visible to everyone
private void galleryAddPic() {
Intent mediaScanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
File f = new File(mCurrentPhotoPath);
Uri contentUri = Uri.fromFile(f);
mediaScanIntent.setData(contentUri);
this.sendBroadcast(mediaScanIntent);
}
}
【问题讨论】：
-
压缩是什么意思？您是将原始图像压缩为 jpeg 还是希望将其存档，即 zip？
-
@NizaSiwale 不存档，我想压缩原始图像
-
我知道一种方法，但不知道如何实现它。我的想法是在保存原始图像之后，然后我使用我拥有的路径获取原始图像并使用 bitmap.compress 进行压缩并将压缩图像存储回相同的路径。
标签： android image path image-compression